CN104568732B - A kind of experimental provision and test method of quick measure reinforcement corrosion speed - Google Patents
A kind of experimental provision and test method of quick measure reinforcement corrosion speed Download PDFInfo
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Abstract
Present invention is disclosed a kind of experimental provision and its test method of quick measure reinforcement corrosion speed, this method is：First, sample is prepared；2nd, solution is prepared；3rd, device is built；The 4th, sample is installed；5th, test sample.A kind of experimental provision and test method that reinforcement corrosion speed is quickly measured using macro cell provided by the invention, when can ensure test, crevice corrosion does not occur for sample, experiment test precision is high, Service Environment by carrying out the test of electrochemistry linear polarization method and reinforced concrete soil sample to reinforcing bar throws sample test and shows that test result has uniformity, effectively demonstrates the validity of the test method.
Description
Technical field
The present invention relates to a kind of method for measuring reinforcement corrosion speed, specifically a kind of quick measure concrete steel
The method of muscle corrosion rate, belongs to the corrosive nature detection method technical field of metal material.
Background technology
Reinforcing bar has been widely used in concrete structure building as construction material.Reinforced concrete structure does not often reach
Just destroyed in advance to Years Of Service, the reason is that reinforcing bar, there occurs corrosion, the corrosion product of accumulation to make concrete produce planted agent
Power and crack, so, the corrosive nature for evaluating reinforcing bar is extremely important.Corrosion rate is to characterize the important parameter of reinforcement corrosion performance
One of.Measure corrosion rate usually uses weight-loss method, but when the effect of sample and surrounding medium shows as passivation system, examination
The corrosion loss amount of sample is smaller, is limited by balance range, and weight-loss method is often undesirable, often using electrochemical process, passes through test
The current density of electrochemical reaction, is converted into corrosion rate, such as macro cell current method.
Macro cell current method is exactly one resistance of connection between the anode and cathode of corrosion galvanic cell, by testing the electricity
Voltage in resistance carrys out the corrosion current in counter circuit.Tested for macro cell method loop current, Chinese patent
201120053871.1 refer to a kind of current level measuring device of macro cell, which being capable of microampere order in measuring circuit
Corrosion current and then attenuating experimental error, improve the accuracy of experiment（A kind of current level measurement dress of macro cells of Geng Chunlei
Put [P] Chinese patents, 201120053871.1.2011-03-03）.At present, also there is the macro cell corrosion test that some are standardized
Method, as ASTM A955/A955M-12 annex in provide 2 kinds of macro cell methods of testing（ASTM A955/A955M-09a,
Standard Specification for Deformed and Plain Stainless-Steel Bars for
Concrete Reinforcement.）.Two methods have been connected one 10 ohm of resistance between a cathode and an anode, are adopted
Corrosion current is calculated with the voltage in sense voltage table test resistance, the cathode of first method and the circuit of anode are by coagulation
Native simulated solution and salt bridge are formed, and the cathode of second method and the circuit of anode are made of concrete.Using first method
When testing reinforcing bar sample, sample corrosion sites are located at sample bottom end more, i.e. in addition sample is being tried there occurs crevice corrosion
The position of sample, concrete simulated solution and air three contact, and the multiple area of corrosion, and from the point of view of experimental principle, it is desirable to corrode
Occur on the rebar surface being immersed in below solution, so, test result cannot react the true corrosion condition of reinforcing bar.Second
Kind of method uses reinforced concrete soil sample, sample prepare it is cumbersome, it is complicated.In addition, ASTM G109-2007 define with
Provide second of similar method of macro cell method of testing in the annex of ASTM A955/A955M-12, but cathode and anode
Between the resistance connected be 100 ohm, the same standard prepared there are sample it is cumbersome, it is complicated the characteristics of（ASTM G109-
2007, Standard Test Method for Determining Effects of Chemical Admixtures on
Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride
Environments.）.
Macro cell current method is one of important method for evaluating reinforcement corrosion speed, but existing macro cell method is normally only fitted
For the Evaluation of Corrosion Resistance of stainless steel rebar, and the applicability of the low-alloyed reinforcing bar of centering is still not clear.And there is experiment
Cycle grow, sample make it is cumbersome, it is complicated the shortcomings of.
The content of the invention
In view of the problems of the above-mentioned prior art, the purpose of the present invention is to propose to a kind of quick measure reinforcement corrosion speed
Method, there are reinforcing bar sample that crevice corrosion, experiment test precision easily occurs when solving the corrosion rate of measure low-alloy steel bar
It is low, the problem of experimental results validity is poor.
The purpose of the present invention, will be achieved by the following technical programs：A kind of side of quick measure reinforcement corrosion speed
Method, comprises the following steps：
Ith, sample is prepared：Bar-shaped reinforcing bar sample is selected, one end of the reinforcing bar is welded with conducting wire, the surface bag of the conducting wire
Insulating protective sleeve is covered with, the end of reinforcing bar and conducting wire are sealed with epoxy resin；
IIth, solution is prepared：Solution is prepared using deionized water of the electrical conductivity less than 2 μ s/cm, and prepares anode concrete mould
Intend liquid and cathode concrete simulated solution；
IIIth, device is built：Experimental provision is divided into anode reaction groove and cathode reaction groove, anode is placed in anode reaction groove
Concrete simulated solution, cathode reaction groove is interior to place cathode concrete simulated solution；Pass through between anode reaction groove and cathode reaction groove
Salt bridge is connected, and salt bridge, anode reaction groove and the cathode reaction groove of connecting completion are inserted in thermostat；
The IVth, sample is installed：Sample is totally immersed into the solution in reactive tank；By at least two samples and cathode concrete
Simulated solution forms cathode, forms anode by a reinforcing bar sample and anode concrete simulated solution, and go here and there between a cathode and an anode
Join the resistance of 100 Ω；And control test solution temperature constant by thermostat；
Vth, test sample：After installing, test is proceeded by, the testing time is 8 weeks, and regularly replaces solution and salt
Bridge, according to voltage conversion corrosion rate（μm/a）Formula：Corrosion rate=11.6i c=11600V/ (AR), wherein：i c：Corrosion electric current density（μA/cm2）, V：Voltage drop on 100 Ohmic resistances（mV）, A：The exposed area of anode reinforcing bar
（cm2）, R：Resistance（Ω）, the corrosion rate for obtaining sample in cathode and anode changes with time graph of a relation.
Further, the method for foregoing quick measure reinforcement corrosion speed, the anode concrete simulated solution in step II
For containing the calcium hydroxide solution that mass fraction is 0~15% sodium chloride, cathode concrete simulated solution is that saturated calcium hydroxide is molten
Liquid.It is in order to make solution purity, in order to avoid introduce other that the solution of preparation, which is less than the purpose of deionized water of 2 μ s/cm using electrical conductivity,
Impurity effect；The calcium hydroxide solution for the sodium chloride that it is 0~15% containing mass fraction that anode concrete simulated solution, which is, with simulation
Sodium chloride content in varying environment, sodium chloride content in actual concrete pore solutions is hardly possible to be existed more than 15%.
Further, the method for foregoing quick measure reinforcement corrosion speed, the salt bridge in step III take the shape of the letter U including one
Glass tube, gel be filled with the glass tube, gel component is agar, potassium chloride and distilled water, its mass ratio is 9:60:
200.To prevent the harmful ion in solution is diffused into the interior salt bridge solution of reference electrode from influencing its electrode potential.
Further, the method for foregoing quick measure reinforcement corrosion speed, is controlled in step IV mixed by thermostat
The temperature of solidifying soil simulated solution is maintained at 25 DEG C；And air inlet pipe is equipped with cathodic region, long logical oxygen, leads to oxygen in the air inlet pipe
Measure as 100mL/min.The temperature for controlling concrete simulated solution by thermostat is in constant ring for 25 DEG C easy to test system
Border, eliminates influence of the temperature to experiment；It is 100mL/min that cathodic region, which leads to amount of oxygen, leads to oxygen using definite value, anti-easy to cathode
Should.
Further, the method for foregoing quick measure reinforcement corrosion speed, test solution are replaced weekly once, and salt bridge is every
Replace once within 3 days；To prevent solution and salt bridge filler from going bad.
The present invention, its protrusion effect are：It is provided by the invention a kind of reinforcement corrosion speed quickly to be measured using macro cell
Experimental provision and test method, when can ensure test, crevice corrosion does not occur for sample, and experiment test precision is high, by steel
Muscle carries out the test of electrochemistry linear polarization method and the Service Environment throwing sample test of reinforced concrete soil sample shows that test result has
Uniformity, effectively demonstrates the validity of the test method.
Just attached drawing in conjunction with the embodiments below, is described in further detail the embodiment of the present invention, so that of the invention
Technical solution is more readily understood, grasps.
Brief description of the drawings
Fig. 1 is the reinforcing bar sample structure diagram of the present invention.
Fig. 2 is the structure diagram of the experimental provision of the present invention.
Fig. 3 is two kinds of reinforcing bars of the invention（Remove scale on surface）Corrosion rate change over time graph of a relation.
Fig. 4 is two kinds of reinforcing bars of the invention（Scale on surface is not removed）Corrosion rate changes over time graph of a relation.
Embodiment
Embodiment 1
Sample is prepared first：Sample is made according to Fig. 1, selects the 1# and 2# of 16 × 125mm of φ to remove scale on surface
Bar-shaped reinforcing bar sample, one end conducting wire 2 of reinforcing bar 1 welds, while the surface of conducting wire is coated with insulating protective sleeve, by reinforcing bar
End and conducting wire epoxy resin 3 seal, and the exposed length of reinforcing bar is 100mm.
Secondly solution is prepared：Solution is prepared using deionized water of the electrical conductivity less than 2 μ s/cm, and prepares anode concrete
Simulated solution and cathode concrete simulated solution, the anode concrete simulated solution are to contain the hydrogen-oxygen that mass fraction is 0~15% sodium chloride
Change calcium solution, cathode concrete simulated solution is saturated calcium hydroxide solution.
Build device and sample is installed：Experimental provision, including the symmetrically arranged anode test of the right and left are built according to Fig. 2
Mechanism, cathode test mechanism, current testing device and thermostat, wherein, between anode mechanism for testing and cathode test mechanism
It is connected by salt bridge 4, salt bridge includes salt bridge glass tube, and the surface of salt bridge glass tube upwardly extends to form upper riser, upper riser
Filling opening is equipped with, the left and right ends of salt bridge glass tube are downwardly extending lower side pipe, and the end of lower side pipe passes through porous ceramics
Encapsulation；The anode mechanism for testing includes anode reaction groove 5, is marked with anodic dissolution 6 in anode reaction groove, in anodic dissolution immersed with
Anode test specimens 7, anode reaction groove are equipped with anode reaction groove end cap 8；Cathode test mechanism includes cathode reaction groove 9, cathode
Cathode solution 10 is marked with reactive tank, cathode solution is interior to be equipped with cathode reaction immersed with cathode test sample 11, cathode reaction groove
Groove end cap 12, and cathode reaction groove end cap is equipped with perforate, and oxygen generator is connected with perforate, filling in the salt bridge glass tube
There is gel, gel component is agar, potassium chloride and distilled water, its mass ratio is 9:60:200；The salt bridge completed, anode will be connected
Reactive tank is inserted in thermostat with cathode reaction groove.
Afterwards, sample is totally immersed into the solution in reactive tank；It is made of two samples and cathode concrete simulated solution
Cathode, anode is formed by a reinforcing bar sample and anode concrete simulated solution, and 100 Ω that connect between a cathode and an anode
Resistance；The temperature for controlling concrete simulated solution by thermostat is maintained at 25 DEG C；Meanwhile air inlet pipe is equipped with cathodic region
13, long logical oxygen in the air inlet pipe, it is 100mL/min to lead to amount of oxygen.
After installing, test is proceeded by, the testing time is 8 weeks, replaces once test solution every 1 weeks, is replaced within every 3 days
Salt bridge.After test starts, in the first week, every other day record primary voltage meter reading, hereafter, remembers every a week
Record single reading.And according to voltage conversion corrosion rate（μm/a）Formula：Corrosion rate=11.6i c = 11600·V/
(AR), wherein：i c：Corrosion electric current density（μA/cm2）, V：Voltage drop on 100 Ohmic resistances（mV）, A：Anode reinforcing bar is naked
The area of dew（cm2）, R：Resistance（Ω）, cathode is obtained with removing the corrosion rate of scale on surface sample in anode with the time
Variation relation figure, as shown in Figure 3.
Embodiment 2
Sample is prepared first：Sample is made according to Fig. 1, selects the 1# and 2# of 11.3 × 125mm of φ not to remove surface oxidation
The bar-shaped reinforcing bar sample of iron sheet, one end conducting wire 2 of reinforcing bar 1 welds, while the surface of conducting wire is coated with insulating protective sleeve, by steel
The end of muscle and conducting wire epoxy resin 3 seal, and the exposed length of reinforcing bar is 60mm.
Secondly solution is prepared：Solution is prepared using deionized water of the electrical conductivity less than 2 μ s/cm, and prepares anode concrete
Simulated solution and cathode concrete simulated solution, the anode concrete simulated solution are to contain the hydrogen-oxygen that mass fraction is 0~15% sodium chloride
Change calcium solution, cathode concrete simulated solution is saturated calcium hydroxide solution.
Build device and sample is installed：Experimental provision, including the symmetrically arranged anode test of the right and left are built according to Fig. 2
Mechanism, cathode test mechanism, current testing device and thermostat, wherein, between anode mechanism for testing and cathode test mechanism
It is connected by salt bridge, salt bridge includes salt bridge glass tube, and the surface of salt bridge glass tube upwardly extends to form upper riser, on upper riser
Equipped with filling opening, the left and right ends of salt bridge glass tube are downwardly extending lower side pipe, and the end of lower side pipe is sealed by porous ceramics
Dress；The anode mechanism for testing includes anode reaction groove, and anodic dissolution is marked with anode reaction groove, and anodic dissolution is interior immersed with anode
Test specimens, anode reaction groove are equipped with anode reaction groove end cap；Cathode test mechanism includes cathode reaction groove, in cathode reaction groove
Cathode solution is marked with, cathode solution is interior immersed with cathode test sample, and cathode reaction groove is equipped with cathode reaction groove end cap, and cathode
Reactive tank end cap is equipped with perforate, and oxygen generator is connected with perforate, and gel, gel component are filled with the salt bridge glass tube
For agar, potassium chloride and distilled water, its mass ratio is 9:60:200；By connecting, the salt bridge completed, anode reaction groove and cathode are anti-
Groove is answered to insert in thermostat.
Afterwards, sample is totally immersed into the solution in reactive tank；It is made of two samples and cathode concrete simulated solution
Cathode, anode is formed by a reinforcing bar sample and anode concrete simulated solution, and 100 Ω that connect between a cathode and an anode
Resistance；The temperature for controlling concrete simulated solution by thermostat is maintained at 25 DEG C；Meanwhile air inlet is equipped with cathodic region
Manage, long logical oxygen in the air inlet pipe, it is 100mL/min to lead to amount of oxygen.
After installing, test is proceeded by, the testing time is 8 weeks, replaces once test solution every 1 weeks, is replaced within every 3 days
Salt bridge.After test starts, in the first week, every other day record primary voltage meter reading, hereafter, remembers every a week
Record single reading.And according to voltage conversion corrosion rate（μm/a）Formula：Corrosion rate=11.6i c = 11600·V/
(AR), wherein：i c：Corrosion electric current density（μA/cm2）, V：Voltage drop on 100 Ohmic resistances（mV）, A：Anode reinforcing bar is naked
The area of dew（cm2）, R：Resistance（Ω）, cathode is obtained with removing the corrosion rate of scale on surface sample in anode with the time
Variation relation figure, as shown in Figure 4.
Claims (6)
- A kind of 1. experimental provision of quick measure reinforcement corrosion speed, it is characterised in that：Including the symmetrically arranged sun of the right and left Pole mechanism for testing, cathode test mechanism, current testing device and thermostat, the anode mechanism for testing and cathode test mechanism Between be connected by salt bridge；The anode mechanism for testing includes anode reaction groove, and it is molten to be marked with anode in the anode reaction groove Liquid, the anodic dissolution is interior to be equipped with anode reaction groove end cap immersed with anode test specimens, the anode reaction groove；The cathode Mechanism for testing includes cathode reaction groove, and cathode solution is marked with the cathode reaction groove, and the cathode solution is interior immersed with cathode Test specimens, the cathode reaction groove is equipped with cathode reaction groove end cap, and cathode reaction groove end cap is equipped with perforate, the perforate Inside it is connected with oxygen generator；The current testing device includes resistance and voltmeter, the resistance by conducting wire respectively with sun Pole test specimens and cathode test sample are connected, and form primary battery circuit loop, and voltmeter is connected in parallel on resistance both ends.
- 2. a kind of test method of experimental provision using quick measure reinforcement corrosion speed as claimed in claim 1, it is special Sign is：Comprise the following steps：Ith, sample is prepared：Bar-shaped reinforcing bar sample is selected, one end of the reinforcing bar is welded with conducting wire, and the surface of the conducting wire is coated with Insulating protective sleeve, the end of reinforcing bar and conducting wire are sealed with epoxy resin；IIth, solution is prepared：Solution is prepared using deionized water of the electrical conductivity less than 2 μ s/cm, and prepares anode concrete simulated solution With cathode concrete simulated solution；IIIth, device is built：Build the experimental provision of the quick measure reinforcement corrosion speed；The IVth, sample is installed：Sample is totally immersed into the solution in reactive tank；Simulated by least two samples and cathode concrete Liquid forms cathode, and anode is formed by a reinforcing bar sample and anode concrete simulated solution, and connects one between a cathode and an anode The resistance of a 100 Ω；And control test solution temperature constant by thermostat；Vth, test sample：After installing, test is proceeded by, the testing time is 8 weeks, and regularly replaces solution and salt bridge, root According to voltage conversion corrosion rate（μm/a）Formula：Corrosion rate=11.6i c=11600V/ (AR), wherein：i c：It is rotten Lose current density（μA/cm2）, V：Voltage drop on 100 Ohmic resistances（mV）, A：The exposed area of anode reinforcing bar（cm2）, R：Electricity Resistance（Ω）, the corrosion rate for obtaining sample in cathode and anode changes with time graph of a relation.
- 3. the test method of quick measure reinforcement corrosion speed according to claim 2, it is characterised in that：The step II In anode concrete simulated solution for contain the calcium hydroxide solution that mass fraction is 0~15% sodium chloride, cathode concrete simulation Liquid is saturated calcium hydroxide solution.
- 4. the test method of quick measure reinforcement corrosion speed according to claim 2, it is characterised in that：The step III In be filled with gel in the salt bridge glass tube of experimental provision built, gel component is agar, potassium chloride and distilled water, its quality Than for 9:60:200.
- 5. the test method of quick measure reinforcement corrosion speed according to claim 2, it is characterised in that：The step IV In by thermostat control concrete simulated solution temperature be maintained at 25 DEG C；And air inlet pipe is equipped with cathodic region, it is described into The logical oxygen of tracheal strips length, it is 100mL/min to lead to amount of oxygen.
- 6. the test method of quick measure reinforcement corrosion speed according to claim 2, it is characterised in that：The test is molten Liquid is replaced weekly once, and salt bridge is replaced once for every 3 days.
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