JP4278391B2 - Reference electrode and potential measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention accommodates an electrode metal and an electrolyte solution in a non-conductive container, electrically connects the electrode metal to a structure in an external electrolyte outside the container, or a pseudo member thereof, and the electrolyte. The present invention relates to a technique for measuring a potential of the structure by electrically connecting a solution to the external electrolyte.
[0002]
[Prior art]
  A conventional reference electrode (also referred to as a reference electrode or a reference electrode) electrically connects an electrode metal housed in a non-conductive container to a structure in an external electrolyte outside the container or a pseudo member thereof. The electrolyte solution contained in the container is brought into contact with an external electrolyte such as soil outside the container through a container partition formed of a non-conductive porous material provided in the container. It is configured to be electrically connected so that the potential of the structure can be measured.
[0003]
  Further, in the conventional potential measuring device, for example, as shown in FIG. 17, the negative electrode side of the external DC power supply 29 is connected to a steel buried pipe (an example of a structure) B in soil (an example of an external electrolyte) B. At the same time, the positive electrode side of the external DC power supply 29 is connected to the counter electrode 30 embedded in the soil 8, and the buried pipe B is protected by the external power supply method in which the anticorrosive current is passed from the counter electrode 30 to the buried pipe B through the soil 8. In the case of measuring the anticorrosion potential, a test piece simulating a coating defect portion is embedded as a pseudo member C in the vicinity of the embedded pipe B, and the electrolyte solution 2 accommodated in the non-conductive container 5 is stored in the container 5. The reference electrode A configured to be electrically connected to the soil 8 by contacting the soil 8 outside the container through the partition wall 40 formed of a non-conductive porous material provided in the container is used. The electrode metal 1 is connected via a DC voltmeter D In the normal state in which the anticorrosion potential is not measured, the pseudo member C is connected to the buried pipe B. The pseudo member C is kept in the same anticorrosion state as the buried pipe B by short-circuiting, and when the anticorrosion potential is measured, the pseudo member C and the buried pipe B are connected to prevent the anticorrosion current from flowing through the pseudo member C. The potential difference between the pseudo member C and the reference electrode A measured by the DC voltmeter D at the timing corresponding to the moment when the short-circuit state is turned off (timing on the order of several ms from the moment when the short-circuit state is turned off). Can be measured as the anticorrosion potential of the buried pipe B.
[0004]
[Problems to be solved by the invention]
  The conventional reference electrode is configured to electrically connect the electrolyte solution to the external electrolyte by bringing the electrolyte solution into contact with the external electrolyte outside the container through the container partition formed of a porous material. The electrolyte solution oozes out into the external electrolyte through the container partition wall, and the electrolyte solution disappears, or the concentration of the electrolyte solution decreases due to oozing into the solution environment such as rainwater, so that the potential measurement accuracy is improved. There is a possibility that it may be lowered, and there is a drawback that it cannot be installed over a long period of time while the electrolyte solution is electrically connected to the external electrolyte.
[0005]
  In addition, the conventional reference electrode is installed so that the electrolyte solution is brought into contact with an external electrolyte such as soil so as to be electrically connected to the external electrolyte, thereby reducing the influence of IR loss due to the external electrolyte. Therefore, when it is installed close to a pseudo member, if bacteria that take in metal ions and decompose (for example, iron bacteria, iron-oxidizing bacteria, sulfur-oxidizing bacteria, etc.) propagate in the external electrolyte, In addition, the electrolyte solution and the pseudo member fall into a pseudo-conduction state, and there is a possibility that the measurement accuracy of the potential may be lowered, and there is a defect that the electrolyte solution and the pseudo member cannot be installed for a long time in the state of being close to the pseudo member.
[0006]
  The conventional potential measuring device is configured to be electrically connected to the external electrolyte 8 by bringing the electrolyte solution 2 into contact with the external electrolyte 8 outside the container through the partition wall 40 formed of a porous material. Since the reference electrode is used, the electrolyte solution 2 oozes into the external electrolyte 8 through the partition wall 40, and the electrolyte solution 2 disappears or oozes into a solution environment such as rainwater. The accompanying decrease in the concentration of the electrolyte solution 2 may reduce the measurement accuracy of the potential, and there is a disadvantage that the electrolyte solution 2 of the verification electrode A cannot be installed over a long period while being electrically connected to the external electrolyte 8.
[0007]
  In addition, the above-described conventional potential measuring device grounds the verification electrode A to the ground surface G side, cuts the short circuit state between the pseudo member C and the buried pipe B, and the pseudo member C and the verification electrode A in which no anticorrosion current flows. In comparison with the case of measuring the potential difference between the reference electrode A and the buried pipe B grounded on the ground surface G side with the anticorrosion current flowing, the anticorrosion current (I) around the pseudo member C and the soil are measured. Although there is an advantage that the IR loss caused by the resistance (R) can be eliminated, the IR loss around the buried pipe B in which the stray current from the anticorrosion current or the electric railway flows does not disappear, so the reference electrode A is simulated. If it is not embedded near the member C, there is a drawback that the potential cannot be measured with high accuracy.
[0008]
  Furthermore, the above-described conventional potential measuring device needs to measure the potential difference between the pseudo member C and the verification electrode A at an extremely short timing of the order of several ms from the moment when the short circuit state between the pseudo member C and the buried pipe B is cut. Therefore, an expensive measuring instrument that can measure the potential difference at such a delicate timing is required, and there is a drawback that the potential cannot be easily measured.
[0009]
  The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to accurately measure a potential over a long period of time.
[0010]
[Means for Solving the Problems]
  According to a first aspect of the present invention, the electrode metal and the electrolyte solution are accommodated in a non-conductive container, and the electrode metal is electrically connected to a structure in the external electrolyte outside the container or a pseudo member thereof. A reference electrode configured to measure the potential of the structure by electrically connecting the electrolyte solution to the external electrolyte, and comprising the electrolyte solution and the conductive viscous fluid. The container is filled separately so as to be electrically connected to each other through an internal partition made of non-conductive porous materialThe container is housed in a non-conductive outer container filled with an internal electrolyte material, and the conductive viscous fluid and the internal electrolyte material are provided in the container with a non-conductive porous material. The external electrolyte is electrically connected to each other through the container partition wall formed through the through-hole formed in the outer container via the conductive viscous fluid and the internal electrolyte material. And an auxiliary metal electrode that is in electrical contact with the internal electrolyte material, and the auxiliary metal electrode and the structure or the pseudo member are electrically connected to form the structure. Is configured to measure the potential ofIn the point.
[0011]
[Action and effect]
  The direct contact between the electrolyte solution and the external electrolyte is blocked by the conductive viscous fluid interposed between the electrolyte solution and the external electrolyte, and the electrolyte solution is electrically connected to the external electrolyte via the conductive viscous fluid. Since it is provided so as to be connectable, the electrolyte solution is less likely to ooze into the external electrolyte.
[0012]
  In addition, a non-conductive exterior container that is filled with an internal electrolyte material so that the interior can be maintained at an equipotential is internally provided with a container that is filled with an electrolyte solution and a conductive viscous fluid. The viscous fluid and the internal electrolyte material are electrically connected to each other through a container partition formed of a non-conductive porous material provided in the container, and the internal electrolyte material is externally connected through a through hole formed in the outer container. Since the electrolyte solution is provided so as to be electrically connectable to the electrolyte, the electrolyte solution is provided so as to be electrically connectable to the external electrolyte through the through hole formed in the exterior container via the conductive viscous fluid and the internal electrolyte material. An effect equivalent to that in which the electrolyte solution is electrically connected to the external electrolyte through the through hole in the vicinity of the through hole formed in the exterior container can be obtained.
[0013]
  Furthermore, an auxiliary metal electrode that is in electrical contact with the internal electrolyte material is provided, and the auxiliary metal electrode and the structure or pseudo member are electrically connected to measure the potential of the structure. The electric potential of the structure can be measured by electrically connecting the auxiliary metal electrode and the structure or the pseudo member without being in electrical contact with the electrolyte solution and the external electrolyte.
[0014]
  Therefore, since there is little possibility that the electrolyte solution will ooze into the external electrolyte, there is almost no possibility that the measurement accuracy of the anticorrosion potential will be lowered, and the electrolyte solution should be installed over a long period while being electrically connected to the external electrolyte. The potential can be measured with high accuracy.
[0015]
  In addition, since the electrolyte solution can be obtained in the vicinity of the through-hole formed in the outer container and electrically connected to the external electrolyte through the through-hole, the through-hole formed in the outer container can be structured. Or, by setting the shape of the outer container and the position of the through-hole so that it can be installed close to the pseudo member, the influence of IR loss due to the external electrolyte interposed between the electrolyte solution and the structure or the pseudo member can be reduced. The potential of the structure can be accurately measured with less.
[0016]
  Furthermore, as a result of installing the electrolyte solution over a long period while being electrically connected to the external electrolyte, the accuracy of the potential measured by making the electrolyte solution and the external electrolyte in electrical contact may be reduced. In this case, the potential of the structure can be measured by electrically connecting the auxiliary metal electrode and the structure or pseudo member.
[0017]
  Claim2The characteristic configuration of the invention described is that the container is formed in a cylindrical shape, and is mounted in the outer container so as to be detachable along the direction of the cylinder axis, and the container partition is provided as the cylinder axis of the container. It exists in the point provided in the container wall provided substantially along the direction.
[0018]
[Action and effect]
  Since the container is formed in a cylindrical shape and is mounted in the outer container so that it can be attached / detached along the cylinder axis direction, the container is attached to / detached from the outer container along the cylinder axis direction, and the electrolyte Although it is easy to replenish the solution and replace the electrode metal and electrolyte solution with the container, the container partition that electrically connects the conductive viscous fluid and the internal electrolyte material is placed in the direction of the cylinder axis such as the container bottom plate. In the case where the container is provided on a container wall provided along a substantially orthogonal direction, if the relative position between the container and the outer container is shifted in a direction away from each other along the cylindrical axis direction, the entire surface of the container partition wall is covered. There may be a gap between the internal electrolyte material and the conductive viscous fluid and the internal electrolyte material may not be secured, but the container partition wall should be approximately along the cylinder axis of the container. Since it is provided on the container wall, the phase between the container and the outer container Be displaced in the direction in which positions are spaced from each other along the cylinder axis direction, there is little risk that a gap between the internal electrolyte material over the entire surface of the container septum.
  Therefore, it is easy to replenish the electrolyte solution, or to replace the electrode metal or the electrolyte solution together with the container, and even if the relative position between the container and the outer container is shifted in the direction away from each other along the cylindrical axis direction, Since there is little possibility that a gap is formed between the container partition wall and the internal electrolyte material, it is easy to ensure electrical connection between the conductive viscous fluid and the internal electrolyte material.
[0019]
  Claim3The characteristic configuration of the described invention is that an electrode metal and an electrolyte solution are accommodated in a non-conductive container, and the electrode metal is electrically connected to a structure in an external electrolyte outside the container or a pseudo member thereof. And a reference electrode configured to electrically connect the electrolyte solution to the external electrolyte and measure the potential of the structure, and is an auxiliary metal electrode that can be electrically connected to the external electrolyte And the auxiliary metal electrode is electrically connected to the structure or the pseudo member so that the potential of the structure can be measured.
[0020]
[Action and effect]
  An auxiliary metal electrode that can be electrically connected to the external electrolyte is provided, and the auxiliary metal electrode is electrically connected to the structure or pseudo member so that the potential of the structure can be measured. Regardless of the electrical contact between the solution and the external electrolyte, the auxiliary metal electrode and the structure or pseudo member can be electrically connected to measure the potential of the structure.
  Therefore, as a result of installing the electrolyte solution for a long time while being electrically connected to the external electrolyte, the electrolyte solution oozes into the external electrolyte, and the electrolyte solution disappears or a solution such as rainwater If there is a possibility that the accuracy of the potential measured by bringing the electrolyte solution and the external electrolyte into electrical contact with each other due to a decrease in the concentration of the electrolyte solution due to the oozing into the environment, the auxiliary metal electrode and the structure Alternatively, since the potential of the structure can be measured by electrically connecting the pseudo member, the potential can be accurately measured even if the electrolyte solution is installed over a long period while being electrically connected to the external electrolyte.
[0021]
  Claim4The characteristic configuration of the described invention is that the auxiliary metal electrode is formed of an antibacterial metal whose metal ions have antibacterial properties.
[0022]
[Action and effect]
  Since metal ions having antibacterial properties are released from the auxiliary metal electrode to the internal electrolyte material and the external electrolyte, it is difficult for bacteria to propagate in the internal electrolyte material near the auxiliary metal electrode and in the external electrolyte.
  Therefore, since bacteria that take in and decompose metal ions do not easily propagate in the internal electrolyte material near the auxiliary metal electrode or in the external electrolyte, even if it is installed close to the pseudo member, the bacterial solution decomposes the electrolyte solution. In order to reduce the effect of IR loss due to the external electrolyte, there is little risk of the pseudo member falling into a pseudo-conductive state, and the potential measurement accuracy is reduced even if it is placed close to the pseudo member for a long period of time. Hard to do.
[0023]
  Claim5The characteristic configuration of the described invention is that a regenerating metal electrode that acts as a cathode for the antibacterial metal is provided so as to be electrically connected to the antibacterial metal.
[0024]
[Action and effect]
  The antibacterial metal can act as an anode by electrically connecting the antibacterial metal and the regenerating metal electrode and applying a DC voltage or a DC current from the outside.
  Therefore, the antibacterial metal and the regenerative metal electrode are electrically connected as necessary, and by applying a DC voltage or a DC current from the outside, the antibacterial metal acts as an anode and is stabilized on the surface of the antibacterial metal. It is possible to form an oxide film and maintain a stable potential as a reference electrode.
[0025]
  Claim6A characteristic configuration of the described invention is that a reference electrode in which an electrode metal and an electrolyte solution are accommodated in a non-conductive container is provided, and the electrode metal is used as a pseudo member of a structure in an external electrolyte outside the container. In addition, the potential measurement is configured such that the potential difference between the pseudo member and the reference electrode can be measured as the potential of the structure by electrically connecting the electrolyte solution to the external electrolyte. An apparatus for constructing the reference electrode, wherein the container is configured to electrically connect the electrolyte solution and the conductive viscous fluid to each other through an internal partition formed of a non-conductive porous material. Filled in each separatelyAndThe container is housed in a non-conductive outer container filled with an internal electrolyte material, and the conductive viscous fluid and the internal electrolyte material are formed of a non-conductive porous material provided in the container. By electrically connecting each other through a container partition wall, the electrolyte solution is electrically connected to the external electrolyte through a through-hole formed in the outer container via the conductive viscous fluid and the internal electrolyte material. Provided to be connectableIn addition, an auxiliary metal electrode that is in electrical contact with the internal electrolyte material is provided, and the auxiliary metal electrode and the pseudo member are electrically connected so that the potential of the structure can be measured.The pseudo member is electrically contacted with the external electrolyte near the through-hole of the exterior container, and the surface other than the specific surface is electrically with respect to the internal electrolyte material. It exists in the point provided so that it might be insulated.
[0026]
[Action and effect]
  The electrolyte solution and the conductive viscous fluid are individually filled in a container so as to be electrically connected to each other through an internal partition made of a non-conductive porous material, and a reference electrode is formed. Direct contact between the electrolyte solution and the external electrolyte is blocked by a conductive viscous fluid interposed between the electrolyte solution and the external electrolyte, and the electrolyte solution is electrically connected to the external electrolyte via the conductive viscous fluid. Since it is provided, there is little possibility that the electrolyte solution will ooze out into the external electrolyte.
[0027]
  In addition, a non-conductive exterior container that is filled with an internal electrolyte material so that the interior can be maintained at an equipotential is internally provided with a container that is filled with an electrolyte solution and a conductive viscous fluid. The electrically viscous fluid and the internal electrolyte material are electrically connected to each other through a container partition formed of a non-conductive porous material provided in the container, so that the electrolytic viscous fluid and the internal electrolyte material are Through the through hole formed in the outer container, the reference electrode is configured so that it can be electrically connected to the external electrolyte, so that the electrolyte solution passes through the hole near the through hole formed in the outer container. An effect equivalent to that of being electrically connected to the external electrolyte through the hole can be obtained, and a pseudo member provided so as to be in electrical contact with the external electrolyte near the through hole of the outer container, and the pseudo member Connected to By reducing the external electrolyte interposed between the case electrode, even though protective current or stray current flows in the pseudo member, it is possible to reduce the IR loss due to the resistance of external electrolyte.
[0028]
  An auxiliary metal electrode that is in electrical contact with the internal electrolyte material is provided, and the reference electrode is configured to measure the potential of the structure by electrically connecting the auxiliary metal electrode and the structure or pseudo member. Therefore, the electrical potential of the structure can be measured by electrically connecting the auxiliary metal electrode and the structure or the pseudo member without depending on the electrical contact between the electrolyte solution and the external electrolyte.
[0029]
  Further, the pseudo member is provided such that the specific surface is in electrical contact with the external electrolyte and the other surface is electrically insulated from the internal electrolyte material. Variation in current density at the interface with the electrolyte can be reduced, and variation in potential in the pseudo member can be suppressed.
[0030]
  Therefore, since the electrolyte solution of the reference electrode is less likely to bleed into the external electrolyte, the potential measurement accuracy is less likely to decrease, and even if the electrolyte solution is installed over a long period of time while being electrically connected to the external electrolyte. The potential can be measured with high accuracy.
[0031]
  In addition, the IR loss due to the anticorrosion current and the resistance of the external electrolyte can be made small enough to be ignored, and variation in potential in the pseudo member can be suppressed, so that the anticorrosion current and stray current flow through the pseudo member. In addition, the potential difference between the pseudo member and the verification electrode can be accurately measured as the potential of the structure, and the potential difference between the pseudo member and the verification electrode can be measured with an extremely short delicate timing within a few ms as in the prior art. Since it is not necessary, it can be easily measured without using an expensive measuring instrument.
[0032]
  Furthermore, as a result of installing the electrolyte solution over a long period while being electrically connected to the external electrolyte, the accuracy of the potential measured by making the electrolyte solution and the external electrolyte in electrical contact may be reduced. In this case, the potential of the structure can be measured by electrically connecting the auxiliary metal electrode and the structure or pseudo member.
[0033]
  Claim7According to the characteristic configuration of the invention described above, a plurality of the verification electrodes are provided, and the pseudo members corresponding to the respective verification electrodes are arranged so that the specific surface thereof faces in a substantially constant direction, and a non-conductive connecting material is interposed therebetween. Are fixed together.
[0034]
[Action and effect]
  The pseudo member corresponding to each reference electrode is arranged so that its specific surface faces in a substantially constant direction, and is fixed integrally through a non-conductive connecting material, so that the moisture content and specific resistance of the external electrolyte, When components and the like are different depending on the location, the potential difference distribution can be examined by measuring the potential difference with the matching electrode corresponding to each pseudo member.
[0035]
  Claim8The characteristic configuration of the invention described is that a non-conductive plate material is provided so that one side surface thereof faces the specific surface side, and the external electrolyte enters between the one side surface and the specific surface or the external surface A gap for filling the electrolyte is formed.
[0036]
[Action and effect]
  In a state where the state of the gap inside the coating film or coating gap of the structure is reproduced with a gap where the external electrolyte formed between one side surface and the specific surface of the nonconductive plate material enters or fills the external electrolyte, The potential difference between the pseudo member and the verification electrode can be measured as the potential of the structure.
  Therefore, in the conventional potential measuring device, it was impossible to monitor the corrosion / corrosion status inside the coating film or coating gap of the structure because of the structure, but the coating film or coating of the structure was impossible. Since the potential difference between the pseudo member and the reference electrode can be measured as the potential of the structure in a state in which the gap state inside the gap is reproduced, the corrosion prevention / corrosion state inside the gap can be monitored.
[0037]
  Claim9The characteristic configuration of the invention described is that the non-conductive plate material is provided in a series so that one side surface thereof faces each specific surface side of the pseudo member, and the external surface is disposed between the one side surface and each specific surface. There is a series of gaps in which the electrolyte enters or fills the external electrolyte.
[0038]
[Action and effect]
  The gap situation inside the coating film and coating gap of the structure was reproduced with a gap where a series of external electrolytes entered or filled with the external electrolyte between one side of each non-conductive plate and each specific surface In this state, the potential difference with the matching electrode corresponding to each pseudo member can be measured, and the distribution of the potential difference within the series of gaps can be examined.
  Therefore, in the conventional potential measuring device, it was impossible to monitor the corrosion / corrosion status inside the coating film or coating gap of the structure because of the structure, but the coating film or coating of the structure was impossible. Since the potential difference between each pseudo member and the corresponding reference electrode can be measured as the potential of the structure while reproducing the gap condition inside the gap, the anticorrosion / corrosion status is monitored while examining the distribution of the potential difference inside the gap. can do.
[0039]
  Claim10The characteristic configuration of the invention described is that the pseudo member is fixed to the exterior container, and a hard cylindrical portion is integrally connected to the upper portion of the exterior container in a substantially concentric manner, and a lower end side is provided at a lower portion of the exterior container. As shown, a hard tip portion having a small diameter is integrally connected in a substantially concentric manner, and a conductor capable of electrically connecting the pseudo member and the electrode metal is passed through the inside of the cylindrical body portion to the upper portion of the cylindrical body portion. It is in the point extended.
[0040]
[Action and effect]
  The pseudo member is fixed to the outer container, and a hard cylindrical portion is integrally connected to the upper portion of the outer container so as to be substantially concentric, and a hard tip portion having a smaller diameter is formed substantially concentrically at the lower end of the outer container. Therefore, the pseudo member can be made to enter the structure body together with the reference electrode by driving the cylindrical body portion into the external electrolyte, and the pseudo member and the electrode metal can be electrically connected. Since the connectable conductive wire is extended to the upper part of the cylindrical part through the inside of the cylindrical part, the potential difference between the pseudo member and the verification electrode can be measured at a desired place as necessary.
[0041]
  Claim11The characteristic configuration of the described invention is that the through hole is formed so as to be opened in a radial direction from the tip of the hard tip.
[0042]
[Action and effect]
  Since the through hole is formed so as to be opened by shifting in the radial direction from the tip of the hard tip portion, the external electrolyte is hardly pushed into the through hole when the cylindrical body is driven into the external electrolyte.
[0043]
  Claim12The characteristic configuration of the described invention is that a current measuring unit capable of measuring a current flowing through the pseudo member and the structure is provided.
[0044]
[Action and effect]
  When the potential difference between the pseudo member and the verification electrode is measured, the current flowing through the pseudo member and the structure can be simultaneously measured.
  Therefore, the conventional potential measuring device is not provided with a means for measuring the current flowing between the pseudo member and the structure, and when it is desired to know the corrosion state of the structure, it is estimated or monitored only from the measured potential. However, since the current flowing in the pseudo member can be measured simultaneously when measuring the potential of the structure, the structure is based on the potential of the structure and the current density obtained from the contact area of the pseudo member with the external electrolyte. It is possible to accurately measure or monitor the corrosion situation such as the corrosion rate of an object or the corrosion prevention situation in view of the corrosion current density.
[0045]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
[0046]
[First Embodiment]
  FIG. 1 shows a polyethylene resin cylinder made of a nonconductive metal ion (viscosity) 1, an electrolyte solution (saturated copper sulfate solution) 2, and an ion conductive viscous fluid 4 containing a copper sulfate crystal 3. The outer container 5 is accommodated in a cylindrical outer container 7 made of polyethylene resin having non-conductivity and filled with an inner electrolyte material 6 in a concentric manner. A certain reference electrode A is shown.
[0047]
  As shown in FIG. 5, the reference electrode A is a steel pipe pile for ground improvement (an example of a structure serving as an anticorrosion object) B in which a plurality of the reference electrodes A are embedded in an external electrolyte (soil) 8 outside the container. The electrode metal 1 of each reference electrode A and the pseudo member C of the steel pipe pile B that is protected by the external power source method are electrically connected via a DC voltmeter D. And the electrolyte solution 2 is electrically connected to the external electrolyte 8 so that the anticorrosion potential of the steel pipe pile B can be measured at a position corresponding to the embedding depth of each verification electrode A.
[0048]
  The electrolyte solution 2 is filled in a cylindrical inner container 9 having non-conductivity, in which the electrode metal 1 is supported concentrically on the inside, and the inner container 9 is filled with an ion conductive viscous fluid. 4 is fixed concentrically in the outer container 5 filled with 4 and an inner partition wall 10 formed of a porous material having non-conductivity such as ceramic is provided at the bottom of the inner container 9, The outer container 5 is filled separately so that the solution 2 and the ion conductive viscous fluid 4 are electrically connected to each other through the inner partition wall 10.
[0049]
  As shown in FIG. 2, the internal electrolyte material 6 filled in the outer container 7 is provided with ion conductivity by infiltrating water into the soil and keeping it moisturized as an example of the internal electrolyte material. Further, a container partition wall 13 formed of a porous material having non-conductivity such as ceramic is provided on the bottom of the outer container 5 from the container wall 5a provided substantially along the cylinder axis X direction. The ion conductive viscous fluid 4 and the internal electrolyte material 6 are electrically connected to each other through the container partition wall 13 so as to protrude into the outer container 7 along a direction substantially orthogonal to the X direction. 7 is filled so that the internal electrolyte material 6 enters the through hole 14 concentrically provided in the bottom plate 25 of the 7, and the internal electrolyte material 6 is provided so as to be electrically connectable to the external electrolyte 8 through the through hole 14.
[0050]
  Therefore, the electrolyte solution 2 can be electrically connected to the external electrolyte 8 through the through hole 14 concentrically provided in the bottom plate 25 of the outer container 7 via the ion conductive viscous fluid 4 and the internal electrolyte material 6. Is provided.
[0051]
  Further, an auxiliary metal electrode 15 that is in electrical contact with the internal electrolyte material 6 is provided so as to be electrically connectable to the external electrolyte 8 via the internal electrolyte material 6, and the metal ions of the auxiliary metal electrode 15 have antibacterial properties. A regenerative metal electrode 16 such as platinum that is made of an antibacterial metal such as silver and acts as a cathode for the auxiliary metal electrode (antibacterial metal) 15 is provided so as to be in electrical contact with the internal electrolyte material 6.
[0052]
  Further, an auxiliary metal electrode 15 that is in electrical contact with the internal electrolyte material 6 is provided so as to be electrically connectable to the external electrolyte 8 via the internal electrolyte material 6, and the auxiliary metal electrode 15 and the pseudo member C are connected to a direct current voltmeter. It is configured to be electrically connected via D so that the anticorrosion potential of the steel pipe pile B can be measured without using the electrode metal 1, and the auxiliary metal electrode 15 is made of silver or the like whose metal ions have antibacterial properties. A regenerative metal electrode 16 such as platinum that is made of antibacterial metal and acts as a cathode for the auxiliary metal electrode (antibacterial metal) 15 is provided so as to be in electrical contact with the internal electrolyte material 6. And the regenerative metal electrode 16 are provided so as to be electrically connectable via an external DC power supply 39 by operating the switch 17.
[0053]
  As shown in FIG. 3, the outer container 7 is provided with a non-conductive polyethylene resin lid 18 screwed into the upper portion so as to be freely opened and closed, and a gap between the lid 18 and the internal electrolyte material 6 is provided. A resin filling 19 having water resistance / insulation performance, such as epoxy resin or urethane resin, is embedded in the lid 18, and the outer container 5, the auxiliary metal electrode 15, and the recycling metal electrode 16 are embedded in the filling 19. The outer container 5 is mounted in the outer container 7 so as to be detachable along the direction of the cylinder axis X, and is connected to the electrode lead wire 20 connected to the electrode metal 1 and the auxiliary metal electrode 15. The auxiliary electrode conducting wire 21 and the reproducing conducting wire 22 connected to the reproducing metal electrode 16 are integrally fixed in the padding 19, and the shield wire 23 obtained by bundling these conducting wires 20, 21, 22 is attached to the lid body 18. Through the outer container 7 It is to extend to the outside.
[0054]
  And as shown also in FIG. 4, the pseudo member C of the steel pipe pile B is in electrical contact with the external electrolyte 8 in the vicinity of the through hole 14 whose specific surface 24 is provided in the bottom plate 25 of the outer container 7, and As shown in FIG. 5, the surface 26 other than the specific surface 24 is fixed to the outer surface side around the through hole 14 so that the surface 26 is electrically insulated from the internal electrolyte material 6. The external electrolyte 8 is electrically connected to the external electrolyte 8 through the ion conductive viscous fluid 4 and the internal electrolyte material 6 while being connected to the steel pipe pile B that is protected by the external power source method. And the electric potential measurement apparatus E which can measure the electric potential difference of the pseudo member C and the collation electrode A as an electric potential of the steel pipe pile B is comprised.
[0055]
  That is, the pseudo member C is formed in the same material as the steel pipe pile B in a ring shape having a square cross section, and the flat ring-shaped surface forming the lower surface side is surrounded by the specific surface 24 to surround the through hole 14. The flat ring-shaped surface 26a, the inner peripheral surface 26b, and the outer peripheral surface that are in electrical contact with the external electrolyte 8 near the steel pipe pile B and that form a surface 26 other than the specific surface 24, that is, the upper surface side. 26 c is fitted to an annular groove 27 formed in the bottom plate 25 and fixed to the outer container 7 so as to be insulated from the internal electrolyte material 6 in a state of surrounding the through hole 14.
[0056]
  Then, the coated conductor 28 of the pseudo member C is inserted into the bottom plate 25 and passed through the internal electrolyte material 6, bundled together with the electrode conductor 20 and the like with the shield wire 23, and extended outside the outer container 7 through the lid 18. It is.
[0057]
  As shown in FIG. 5, the steel pipe pile B is electrically connected to the counter electrode 30 in which the negative electrode side of the external DC power supply 29 is electrically connected to the steel pipe pile B and the positive electrode side of the external DC power supply 29 is embedded in the external electrolyte 8. The anticorrosion is performed by an external power supply method in which an anticorrosion current is supplied from the counter electrode 30 to the steel pipe pile B via the external electrolyte 8.
[0058]
  The measurement unit J connects the coated conductors 28 connected to the pseudo member C to the steel pipe pile B so that each pseudo member C can be maintained in a corrosion-proof state as the same structure as the steel pipe pile B, and for the electrode. The metal 1 is electrically connected to the pseudo member C via the DC voltmeter D, and the current flowing across the pseudo member C and the steel pipe pile B can be measured simultaneously when measuring the potential difference between the pseudo member C and the verification electrode A. As described above, a direct current ammeter (an example of a current measuring means) F is provided between the connecting portions of the coated conductor 28 and the steel pipe pile B.
[0059]
  Further, the auxiliary metal electrode 15 and the pseudo member C are electrically connected via the DC voltmeter D by the operation of the switch 31 so that the anticorrosion potential of the steel pipe pile B can be measured without using the electrode metal 1. The auxiliary metal electrode 15 and the regenerative metal electrode 16 are configured to be electrically connectable via an external DC power supply 39 by the operation of the switch 17.
[0060]
  And when measuring the anticorrosion potential of the steel pipe pile B, the DC voltmeter D connected to each pseudo member C and the electrode lead wire 20 of each reference electrode A are connected by the operation of the switch 31, and the pseudo member C Can be measured as the anticorrosion potential of the steel pipe pile B, and the accuracy of the anticorrosion potential measured by the electrical contact between the electrolyte solution 2 and the external electrolyte 8 is reduced due to the decrease in the electrolyte solution 2. In the case where there is a possibility that the auxiliary metal electrode 15 is connected, the auxiliary electrode lead wire 21 connected to the auxiliary metal electrode 15 is connected to the DC voltmeter D by the operation of the switch 31, and the potential difference between the pseudo member C and the auxiliary metal electrode 15 is changed to the steel pipe. The potential of the pile B can be measured.
[0061]
[Second Embodiment]
  6 and 7 show another embodiment of the reference electrode A. The outer container 7 is made of polyethylene resin having non-conductivity on the outer periphery of a cylindrical body 32 made of polyethylene resin having non-conductivity. A disk-shaped bottom plate 25 is detachably screwed to form a through-hole 14 in the disk-shaped bottom plate 25 and a pseudo member C is fixed.
[0062]
  Then, a circular plate material 33 made of polyethylene resin having substantially the same diameter as the disc-shaped bottom plate 25 and having non-conductivity is opposed so that one side surface 33a faces the flat specific surface 24 of the pseudo member C, A non-conductive polyethylene resin spacer 34 is used to be removably fixed concentrically with the disc-shaped bottom plate 25 with a screw 35 so that the gap in the coating film portion of the structure can be reproduced. In addition, the external electrolyte 8 enters between the one side surface 33a and the specific surface 24, or the external electrolyte 8 is filled to form gaps 36 through which current flows in and out at regular intervals, and the dimensions of the spacers 34 are changed. Thus, the distance between the one side surface 33a and the specific surface 24 can be changed and adjusted.
  Other configurations are the same as those of the first embodiment.
[0063]
[Third Embodiment]
  8 and 9 show another embodiment of the gap 36 provided so as to reproduce the gap state in the coating film portion of the structure, etc., which is substantially the same diameter as the disc-shaped bottom plate 25 of the outer container 7 and is non-conductive. A circular plate material 33 made of polyethylene resin having the properties of C-type having an opening 37 so that one side 33a faces the flat specific surface 24 of the pseudo member C and current flows in and out. Together with the ring-shaped peripheral wall (an example of a spacer) 38, the gap is formed integrally with the disk-shaped bottom plate 25 in a concentric manner, and the external electrolyte 8 enters or fills the external electrolyte 8 between the one side surface 33 a and the specific surface 24. 36 are formed at regular intervals.
  Other configurations are the same as those of the second embodiment.
[0064]
[Fourth Embodiment]
  10 and 11 show another embodiment of the gap 36 provided so as to reproduce the situation of the gap in the coating film portion or the like of the structure, which is substantially the same diameter as the disk-like bottom plate 25 of the outer container 7 and is non-conductive. A circular opening 37 is formed concentrically on a circular plate 33 made of polyethylene resin so as to allow current to flow in and out, and the circular plate 33 is flat on one side 33a of the pseudo member C. The ring-shaped peripheral wall (an example of a spacer) 38 and the disk-shaped bottom plate 25 are integrally formed concentrically so as to face the specific surface 24, and an external electrolyte is formed between the one side surface 33 a and the specific surface 24. A gap 36 for entering 8 or filling the external electrolyte 8 is formed at regular intervals.
  Other configurations are the same as those of the second embodiment.
[0065]
[Fifth Embodiment]
  FIG. 12 shows another embodiment of the potential measuring device E. A reference electrode unit H in which a plurality of reference electrodes A shown in the first embodiment are integrally assembled is made of a steel buried pipe (an example of a structure) B. The measurement unit J shown in the first embodiment is provided corresponding to each verification electrode A, and the potential difference between each pseudo member C and the corresponding verification electrode A can be measured as the potential of the embedded tube B. It is constituted as follows.
[0066]
  The buried pipe B is electrically connected to the negative electrode side of the external DC power supply 29 to the buried pipe B, and is electrically connected to the counter electrode 30 embedded in the external electrolyte 8 at the positive electrode side of the external DC power supply 29. Corrosion protection is performed by an external power supply method in which an anticorrosion current flows from the counter electrode 30 to the buried pipe B through the external electrolyte 8.
[0067]
  As shown in FIG. 13, the verification electrode unit H has a plurality of verification electrodes A arranged vertically and horizontally so that the specific surface 24 of each pseudo member C faces in a substantially constant direction, and a substrate made of polyethylene resin (non-conductive The external electrolyte 8 enters between the gap forming plate material (non-conductive plate material) 33 made of a transparent acrylic resin and the specific surface 24 of each pseudo member C or the external electrolyte. A series of gaps 36 for filling 8 is formed.
[0068]
  In other words, when welding the buried pipes B with each other, since there is no factory coating in the vicinity of the welded part and the tubular metal surface is exposed, the outer peripheral surface of the buried pipe B is spread over both sides sandwiching the welded part. Covering with a heat-shrinkable resin tube or the like is performed to prevent corrosion, and a gap forming plate 33 is formed so as to reproduce the gap state between the resin tube or the like and the embedded tube B in this case caused by deterioration over time. Are provided in a series so that one side surface thereof faces each specific surface 24 side of the pseudo member C, thereby forming a series of gaps 36 between the gap forming plate 33 and the specific surface 24 of each pseudo member C, The gap 36 is filled with the external electrolyte 8 near the buried pipe B or an electrolyte corresponding to the external electrolyte 8 so that the potential distribution and current distribution in the gap 36 can be monitored.
[0069]
  As shown in FIG. 14, each of the pseudo members C is provided with a gap forming plate 33 corresponding to the covering length at a substantially central portion of a rectangular substrate 41 longer than the covering length of the buried pipe B made of a resin tube or the like. A plurality of through holes 44 are arranged side by side so as to be distributed over a range corresponding to the length of the tubular metal surface, and the lower end portion of the outer casing 7 of the verification electrode A is fitted into each through hole 44. In addition, it is fixed integrally via the substrate 41 by liquid-tight connection over the entire circumference by adhesive or heat fusion.
[0070]
  The series of gaps 36 are formed in a U-shaped spacer 45 made of polyethylene resin that is liquid-tightly bonded by an adhesive or thermal fusion along the left and right long sides and one short side of the substrate 41. The forming plate member 33 is screwed and provided so as to open at one end side in the longitudinal direction of the substrate 41.
[0071]
  Although not shown, the gap forming plate 33 is screwed to the spacer 45 bonded only to the left and right long sides of the substrate 41, so that the gap forming plate 33 and the specific surface 24 of each pseudo member C are interposed between them. By forming a series of gaps 36 that are open at both ends in the longitudinal direction of the substrate 41, or by changing the protruding height of the spacer 45 from the substrate 41, the gap forming plate 33 and the specific surfaces 24 of the pseudo members C You may enable it to adjust the space | interval.
  Other configurations are the same as those of the first embodiment.
[0072]
[Sixth Embodiment]
  FIG. 15 shows another embodiment of the potential measuring device E. As shown in FIG. 16, the pseudo member C is fixed to the outer casing 7 of the verification electrode A shown in the first embodiment, and the upper portion of the outer casing 7 is fixed. The hard cylindrical body portion 46 is integrally connected in a substantially concentric manner, and a hard tip portion 50 having a smaller diameter is integrally connected to the lower portion of the outer container 7 toward the lower end side so that the through hole 14 is a hard tip. The opening is formed so as to be shifted from the tip of the portion 50 in the radial direction.
[0073]
  In other words, the pseudo member C, which is substantially the same diameter as the outer container 7 and is formed in a conical shape having a smaller diameter toward the lower end side, is fixed to the bottom plate 25 of the outer container 7 in a concentric shape, and the hard tip portion is fixed. 50, and a rigid cylindrical body portion 46 made of a hard material made of polyethylene resin having substantially the same diameter as the outer container 7 is screwed and fixed concentrically to the lid 18 on the upper portion of the outer container 7 in a detachable manner. A verification electrode A configured as described above is provided.
[0074]
  The reference electrode A is formed in the pseudo member C by extending a thin cylindrical member 47 integrally with the bottom plate 25 of the outer container 7 to form a through hole 14 that is shifted in the radial direction from the tip of the pseudo member C. The cylindrical member 47 is tightly fitted into the through-hole, and the specific surface 24 formed by the cylindrical outer peripheral surface 48 and the conical surface 49 of the pseudo member C is in electrical contact with the external electrolyte 8 in a state of surrounding the through-hole 14. In addition, the pseudo member C is fixed to the outer container 7 so that a surface (insulating surface) 26 other than the specific surface 24 surrounds the through hole 14 and is electrically insulated from the internal electrolyte 6.
[0075]
  The coated conductors 20 and 28 that can be electrically connected in a state where the insulating surface 26 of the pseudo member C and the electrode metal 1 are electrically insulated from the internal electrolyte 6 are connected to the inside of the outer container 7 and the cylindrical body. The inside of the portion 46 is extended to the upper portion of the cylindrical body portion 46, and the cylindrical body portion 46 is driven into the external electrolyte 8, thereby allowing the pseudo member C to enter the buried tube B at a desired location. If necessary, the potential difference between the pseudo member C and the verification electrode A can be measured.
[0076]
  It should be noted that a plurality of through holes 14 that communicate the inside and outside of the outer casing 7 are opened to the outer surface side of the pseudo member C so that the inner electrolyte 6 and the outer electrolyte 8 are electrically connected at the bottom of the outer casing 7. It may be provided.
  Other configurations are the same as those of the first embodiment.
[0077]
[Other Embodiments]
1. Even if the reference electrode according to the present invention is configured so that the potential of the structure can be measured by electrically connecting the electrode metal to the pseudo member provided in the external electrolyte away from the outer container, An electrode metal may be electrically connected to a structure not provided with a member so that the potential of the structure can be measured.
2. The reference electrode according to the present invention may be provided with an auxiliary metal electrode that can be directly connected to and electrically connected to the external electrolyte.
3. The verification electrode according to the present invention may be provided with an antibacterial metal that is in direct contact with the external electrolyte.
4). The verification electrode and the potential measuring device according to the present invention may be installed and used so that the electrolyte solution is electrically connected to the external electrolyte, if necessary.
5). The reference electrode and the potential measuring device according to the present invention partition the inside of the container with an inner partition formed of a non-conductive porous material, and electrically connect the electrolyte solution and the conductive viscous fluid to each other through the inner partition. The container may be filled separately so as to be connected to each other.
6). The reference electrode and potential measuring device according to the present invention may be used for measuring the natural potential of various structures.
7. The reference electrode and the potential measuring device according to the present invention may be used to measure the potential and natural potential of various structures in seawater as an external electrolyte.
8). The reference electrode and potential measuring device according to the present invention may be used for measuring the potential of various structures other than steel pipe piles and buried pipes.
9. The reference electrode and the potential measuring device according to the present invention may be used for grasping and monitoring the anticorrosion / corrosion state inside the sheath tube in a double tube structure or the like.
10. In the potential measuring device according to the present invention, the specific surface is in electrical contact with the external electrolyte near the through-hole of the outer container with the pseudo member being separated from the outer container, and the surface other than the specific surface is the inner electrolyte material. It may be provided so as to be electrically insulated.
11. The potential measuring device according to the present invention may measure the potential and current for grasping the natural corrosion status, the corrosion status by various macrocells, the degree of influence by electric corrosion, and the identification of the influence range, etc. You may measure the electric potential and electric current by the electrochemical measurement represented by the polarization resistance method for monitoring the situation.
12 Claim10The potential measuring device according to the present invention is provided with a pseudo member in a cylindrical outer container whose lower end portion is formed with a smaller diameter toward the lower end side, and a hard cylindrical portion is formed substantially concentrically on the upper portion of the outer container. It may be connected to the unit.
13. Claim10In the potential measuring device according to the present invention described above, a pseudo member may be fixed between the lower portion of the outer container and the hard tip portion.
[Brief description of the drawings]
1 is a longitudinal sectional view of a reference electrode
[Fig. 2] Cross-sectional view of the main part of the reference electrode
FIG. 3 is a plan view showing the top of the reference electrode
FIG. 4 is a perspective view showing the bottom of a reference electrode
FIG. 5 is a schematic diagram of a potential measuring device.
FIG. 6 is a cross-sectional view of a main part showing a second embodiment.
FIG. 7 is a bottom view showing a second embodiment.
FIG. 8 is a cross-sectional view of a main part showing a third embodiment.
FIG. 9 is a bottom view showing a third embodiment.
FIG. 10 is a cross-sectional view of a main part showing a fourth embodiment.
FIG. 11 is a bottom view showing a fourth embodiment.
FIG. 12 is a schematic view showing a fifth embodiment.
FIG. 13 is a perspective view of a main part showing a fifth embodiment.
  (B) Bottom view of part of the main part showing the fifth embodiment
FIG. 14 is a cross-sectional view of a main part showing a fifth embodiment.
FIG. 15 is a schematic view showing a sixth embodiment.
FIG. 16 is a cross-sectional view of a main part showing a sixth embodiment.
FIG. 17 is a schematic diagram of a conventional potential measuring device.
[Explanation of symbols]
  1 Metal for electrodes
  2 Electrolyte solution
  4 Conductive viscous fluid
  5 containers
  5a Container wall
  6 Internal electrolyte material
  7 exterior container
  8 External electrolyte
  10 Internal bulkhead
  13 Container bulkhead
  14 Through hole
  15 Auxiliary metal electrode
  16 Metal electrode for recycling
  20 conductor
  24 Specific surface
  26 Surfaces other than specific surfaces
  28 conductor
  33 Plate material
  33a One side
  36 Clearance
  41 connecting material
  46 Tube body
  50 Hard tip
  A reference electrode
  B Structure
  C Pseudo member
  F Current measurement means
  X cylinder axis

Claims (12)

The electrode metal and the electrolyte solution are accommodated in a non-conductive container,
The electrode metal can be electrically connected to a structure in the external electrolyte outside the container or a pseudo member thereof, and the electrolyte solution can be electrically connected to the external electrolyte so that the potential of the structure can be measured. A reference electrode configured as follows:
The electrolyte solution and the conductive viscous fluid are individually filled in the container so as to be electrically connected to each other through an internal partition formed of a non-conductive porous material, and the container is filled with an internal electrolyte. A non-conductive outer container filled with a material, and the conductive viscous fluid and the internal electrolyte material are passed through a container partition formed of a non-conductive porous material provided in the container. By electrically connecting each other, the electrolyte solution is provided so as to be electrically connectable to the external electrolyte through a through hole formed in the exterior container via the conductive viscous fluid and the internal electrolyte material. With
An auxiliary metal electrode that is in electrical contact with the internal electrolyte material is provided, and the auxiliary metal electrode is electrically connected to the structure or the pseudo member so that the potential of the structure can be measured. A reference electrode. The container is formed into a cylindrical shape, and is detachably mounted along the cylinder axis direction, and is internally mounted in the outer container,
It said container septum reference electrode of Aru claim 1, wherein the provided substantially along allowed is provided with container wall to the tube axis direction of the container. The electrode metal and the electrolyte solution are accommodated in a non-conductive container,
The electrode metal can be electrically connected to a structure in the external electrolyte outside the container or a pseudo member thereof, and the electrolyte solution can be electrically connected to the external electrolyte so that the potential of the structure can be measured. A reference electrode configured as follows:
An auxiliary metal electrode that can be electrically connected to the external electrolyte is provided,
A reference electrode configured to electrically connect the auxiliary metal electrode and the structure or the pseudo member to measure the potential of the structure. The reference electrode according to any one of claims 1 to 3, wherein the auxiliary metal electrode is formed of an antibacterial metal whose metal ions have antibacterial properties. The reference electrode according to claim 4 , wherein a regenerative metal electrode that acts as a cathode for the antibacterial metal is provided so as to be electrically connected to the antibacterial metal. Provide a reference electrode that contains the electrode metal and electrolyte solution in a non-conductive container,
The electrode metal is electrically connected to the pseudo member of the structure in the external electrolyte outside the container, and the electrolyte solution is electrically connected to the external electrolyte, and the pseudo member and the reference electrode A potential measuring device configured to measure a potential difference as a potential of the structure,
In configuring the reference electrode,
The electrolyte solution and the conductive viscous fluid are individually filled in the container so as to be electrically connected to each other through an internal partition formed of a non-conductive porous material, and the container is filled with an internal electrolyte. A non-conductive outer container filled with a material, and the conductive viscous fluid and the internal electrolyte material are passed through a container partition formed of a non-conductive porous material provided in the container. By electrically connecting each other, the electrolyte solution is provided so as to be electrically connectable to the external electrolyte through a through-hole formed in the exterior container via the conductive viscous fluid and the internal electrolyte material. And
An auxiliary metal electrode that is in electrical contact with the internal electrolyte material is provided, the auxiliary metal electrode and the pseudo member are electrically connected, and the potential of the structure can be measured .
The pseudo member has a specific surface electrically contacting the external electrolyte near the through-hole of the exterior container, and a surface other than the specific surface is electrically insulated from the internal electrolyte material. A potential measuring device provided as described above. A plurality of the verification electrodes are provided, and the pseudo members corresponding to the respective verification electrodes are arranged so that the specific surfaces thereof face in a substantially constant direction, and are fixed integrally through a non-conductive connecting material. Item 7. The potential measuring device according to Item 6 . A non-conductive plate material is provided so that one side surface thereof faces the specific surface side, and a gap is formed between the one side surface and the specific surface so that the external electrolyte enters or is filled with the external electrolyte. The potential measuring device according to claim 6 or 7 . A non-conductive plate material is provided in series so that one side surface thereof faces each specific surface side of the pseudo member, and the external electrolyte enters between the one side surface and each specific surface or the external electrolyte The potential measuring device according to claim 7 , wherein gaps to be filled are formed in series. The pseudo member is fixed to the outer container, and a hard cylindrical body is integrally connected to the upper part of the outer container so as to be substantially concentric. Concentric and integrated,
The electric potential measuring device according to claim 6 , wherein a conductive wire capable of electrically connecting the pseudo member and the electrode metal is extended through the inside of the cylindrical body portion to an upper portion of the cylindrical body portion. The potential measuring device according to claim 10, wherein the through hole is formed so as to open while being shifted in a radial direction from a tip of the hard tip. The electric potential measuring device according to any one of claims 6 to 11 , further comprising a current measuring unit capable of measuring a current flowing through the pseudo member and the structure.

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