CN111354956B - Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate - Google Patents
Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate Download PDFInfo
- Publication number
- CN111354956B CN111354956B CN202010104695.3A CN202010104695A CN111354956B CN 111354956 B CN111354956 B CN 111354956B CN 202010104695 A CN202010104695 A CN 202010104695A CN 111354956 B CN111354956 B CN 111354956B
- Authority
- CN
- China
- Prior art keywords
- bipolar plate
- metal bipolar
- corrosion
- metal
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0228—Composites in the form of layered or coated products
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a weld line anticorrosion treatment method of a metal bipolar plate and the metal bipolar plate, relating to the technical field of fuel cells. The main technical scheme adopted is as follows: a method for the anticorrosion treatment of a welding wire of a metal bipolar plate is used for the anticorrosion treatment of the welding wire on the metal bipolar plate and comprises the following steps: and coating the anti-corrosion liquid on the welding lines of the metal bipolar plate, and curing the anti-corrosion liquid coated on the welding lines of the metal bipolar plate to form an anti-corrosion layer on the surface of the welding lines of the metal bipolar plate. The invention is mainly used for effectively improving the corrosion resistance of the welding line of the metal bipolar plate.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a welding wire anti-corrosion treatment method of a metal bipolar plate and the metal bipolar plate.
Background
Metal materials have the advantages of low price, good machinability, good toughness, good strength, etc., and thus, metal bipolar plates are considered by those skilled in the art as the development direction of fuel cells. The bipolar plate needs to have excellent conductivity and corrosion resistance; therefore, the surface modification of the metal substrate to deposit a coating on the surface thereof to improve the corrosion resistance and electrical conductivity thereof is a core process for preparing the metal bipolar plate.
The surface modification batch production technology of the metal substrate usually adopts roll-to-roll production, and the technology has high production efficiency and low cost. And cutting and punching the material after surface modification to form the metal bipolar plate veneer. Two metal bipolar plate veneers (one is a cathode veneer, the other is an anode veneer) are welded by laser to form the metal bipolar plate. Wherein, the coating on the surface of the metal substrate can be damaged in the laser welding process, and a welding wire is formed on the surface of the metal bipolar plate; the main components of the welding wire are iron, chromium, nickel and the like.
However, the inventor of the present invention finds that electrochemical corrosion occurs at the weld line during the use of the metal bipolar plate, which accelerates the corrosion of the weld line; on one hand, the efficiency of the membrane electrode can be reduced when corroded iron ions enter the solution; on the other hand, the corrosion speed of the welding line is high, so that the perforation phenomenon is easily formed, the mixing of hydrogen and oxygen is caused, and accidents such as combustion or explosion are caused.
Disclosure of Invention
In view of the above, the present invention provides a method for performing a weld line anticorrosion treatment on a metal bipolar plate and a metal bipolar plate, and mainly aims to effectively improve the corrosion resistance of a weld line of a metal bipolar plate.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides a method for performing anticorrosion treatment on a bonding wire of a metal bipolar plate, which is used for performing anticorrosion treatment on the bonding wire of the metal bipolar plate, and includes the following steps:
coating: coating the anti-corrosion liquid on the welding line of the metal bipolar plate;
and (3) curing: and curing the anti-corrosion liquid coated at the welding line of the metal bipolar plate to form an anti-corrosion layer on the surface of the welding line of the metal bipolar plate.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the coating step comprises:
step 1): overlapping the baffle plate on the metal bipolar plate; the position of the baffle corresponding to the welding line is set to be a hollow part, so that the welding line on the metal bipolar plate is completely exposed, and the non-welding line of the metal bipolar plate is completely shielded by the baffle;
step 2): and coating an anti-corrosion liquid on the welding line.
Preferably, the coating step further comprises step 3): separating the baffle from the metallic bipolar plate.
Preferably, in the coating step: coating the anti-corrosion liquid on the welding line of the metal bipolar plate in a spraying or brushing way; preferably, the anti-corrosion liquid is coated on the welding line of the metal bipolar plate by adopting an ultrasonic spraying mode.
Preferably, the thickness of the baffle is 0.05-0.5mm, preferably 0.05-0.3 mm.
Preferably, the baffle and the metal bipolar plate are overlapped together by any one of mechanical pressing, bonding and vacuum pressing.
Preferably, in the coating step: the anti-corrosion liquid is anti-corrosion hydrophobic liquid so as to form an anti-corrosion hydrophobic layer on the surface of the welding line of the metal bipolar plate.
Preferably, in the coating step: the anti-corrosion liquid is a metal salt solution or an organic polymer aqueous solution; preferably, the anti-corrosion liquid is any one of a chloroplatinic acid solution, a chloroiridic acid solution and a PTFE solution; more preferably, the PTFE solution is a PTFE aqueous solution with a mass fraction of 0.1 to 5%.
Preferably, after the anti-corrosion liquid is coated on the welding line, the anti-corrosion liquid is allowed to stay at the welding line of the metal bipolar plate for 30s-5min, and then the curing step is carried out.
Preferably, in the curing step: the curing temperature is 200 ℃ to 450 ℃, and the curing time is 30s to 15min, preferably 1 to 10 min.
Preferably, the curing step is performed in a muffle furnace.
Preferably, the thickness of the corrosion protection layer is 2-20 nm.
Preferably, the coating step and the curing step are circularly performed for multiple times; and/or the loading amount of the corrosion protection layer on the metal bipolar plate is a set loading amount; wherein the loading amount refers to the mass of the corrosion protection layer loaded per unit area of the weld line on the metallic bipolar plate; preferably, the set loading amount is 0.1 to 10mg/cm2More preferably 1 to 3mg/cm2。
In another aspect, embodiments of the present invention provide a metallic bipolar plate, wherein the metallic bipolar plate includes:
a metal bipolar plate body having a weld line thereon;
the anti-corrosion layer covers the welding line of the metal bipolar plate body;
preferably, the thickness of the anti-corrosion layer is 2-20 nm;
preferably, the loading amount of the anti-corrosion layer is 0.1-10mg/cm2More preferably 1 to 3mg/cm2(ii) a Wherein the loading amount refers to the mass of the corrosion protection layer loaded per unit area of the weld line on the metallic bipolar plate;
preferably, the welding line is a laser welding line;
preferably, the metal bipolar plate body is formed by welding a cathode single plate and an anode single plate; further preferably, the cathode single plate and/or the anode single plate is/are a metal plate with a modified coating surface;
preferably, the metal bipolar plate body is subjected to corrosion prevention treatment by the welding wire corrosion prevention treatment method of any one of the metal bipolar plates to obtain the metal bipolar plate.
Compared with the prior art, the welding wire antiseptic treatment method of the metal bipolar plate and the metal bipolar plate have the following beneficial effects:
according to the welding line anticorrosion treatment method of the metal bipolar plate and the metal bipolar plate, the anticorrosion layer is coated at the welding line of the metal bipolar plate, so that the anticorrosion property of the welding line of the metal bipolar plate can be effectively improved.
Further, when the anti-corrosion liquid is coated on the welding wires of the metal bipolar plate, the welding wire anti-corrosion treatment method of the metal bipolar plate provided by the invention comprises the following steps: by designing the baffle plate and overlapping the baffle plate on the metal bipolar plate, the welding line of the metal bipolar plate is exposed from the hollow part on the baffle plate, and the non-welding line is shielded by the baffle plate, so that the design can avoid the situation that the anti-corrosion liquid is coated on the non-welding line of the metal bipolar plate (if the anti-corrosion liquid is coated on the non-welding line, the contact resistance of the metal bipolar plate is greatly reduced, and the performance is influenced); thereby, a spraying method, especially an ultrasonic spraying method can be used to improve the coating efficiency. The design finally enables the anticorrosion treatment method to be simple and easy to implement, has low cost and can realize the anticorrosion treatment of the welding wires in batches.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a metal bipolar plate according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a baffle plate provided in an embodiment of the present invention;
fig. 3 is a schematic view of an ultrasonic sprayer for ultrasonic spraying of a composite structure formed by a baffle plate and a metal bipolar plate according to an embodiment of the invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the process preparation of the metal bipolar plate: after two metal bipolar plate single plates (one is a cathode single plate and the other is an anode single plate) are welded by laser to form a metal bipolar plate, welding wires are formed on the metal bipolar plate; the prior art does not perform anticorrosion treatment on the welding wire. However, the inventors of the present invention found that: the electrochemical corrosion phenomenon exists at the welding wire position, and the corrosion of the welding wire can be accelerated; on one hand, the efficiency of the membrane electrode can be reduced when corroded iron ions enter the solution; on the other hand, the corrosion speed of the welding line is high, so that the perforation phenomenon is easily formed, the mixing of hydrogen and oxygen is caused, and accidents such as combustion or explosion are caused. Therefore, the embodiment of the invention provides a welding line anticorrosion treatment method of a metal bipolar plate, which is used for improving the corrosion resistance of a welding line of the metal bipolar plate; the method specifically comprises the following steps:
coating: and coating the anti-corrosion liquid on the welding line of the metal bipolar plate.
And (3) curing: and curing the anti-corrosion liquid coated at the welding line of the metal bipolar plate to form an anti-corrosion layer on the surface of the welding line of the metal bipolar plate.
However, when the anti-corrosion liquid is coated on the welding line of the metal bipolar plate, if a manual coating method is adopted, the efficiency is too low, and the batch processing is not facilitated; if the machine spraying method is used, the anti-corrosion liquid can be easily coated on the non-welding line of the metal bipolar plate, so that the contact resistance of the metal bipolar plate is increased, and the performance of the metal bipolar plate is influenced. In order to improve the efficiency of anti-corrosion treatment and avoid the anti-corrosion liquid from being coated on the non-welding line of the metal bipolar plate; the invention further designs a coating step, which comprises the following steps:
step 1): referring to fig. 1 and 2, a baffle plate 2 is designed, and the size of the baffle plate 2 is equivalent to that of a metal bipolar plate 1; and the baffle 2 is set to be a hollow structure, and the position on the baffle 2 corresponding to the welding line 11 is set to be a hollow 21. The baffle plate 2 is overlapped on the metal bipolar plate 1, the welding line 11 on the metal bipolar plate is completely exposed from the hollow part 21 on the baffle plate 2, and the non-welding line part of the metal bipolar plate 1 is completely shielded by the baffle plate 2.
Preferably, the thickness of the baffle 2 is 0.05-0.5mm, preferably 0.05-0.3 mm.
Preferably, the baffle 2 and the metal bipolar plate 1 are overlapped by any one of mechanical pressing, bonding and vacuum pressing.
Step 2): and coating the anti-corrosion liquid on the welding line. Preferably, the anti-corrosion liquid is coated on the welding line of the metal bipolar plate in a spraying or brushing way;
preferably, the anti-corrosion liquid is coated on the welding line of the metal bipolar plate by adopting an ultrasonic spraying mode. Referring to fig. 3, an ultrasonic sprayer 4 is used for spraying a corrosion-resistant liquid 5 on the composite structure 3 formed by overlapping the baffle plate and the metal bipolar plate. Wherein the baffles in the composite structure 3 are arranged towards the spray head of the ultrasonic spray coater.
Step 3): separating the baffle from the metallic bipolar plate.
Preferably, the anti-corrosion liquid is anti-corrosion hydrophobic liquid to form an anti-corrosion hydrophobic layer on the surface of the weld line of the metal bipolar plate. Preferably, the anti-corrosion solution is a metal salt solution (e.g., a chloroplatinic acid solution (preferably an ethanol chloroplatinic acid solution), a chloroiridic acid solution (preferably an ethanol chloroiridic acid solution)) or an organic polymer aqueous solution. Preferably, the anti-corrosion liquid of the invention preferably uses a polytetrafluoroethylene PTFE solution; more preferably, the PTFE solution is a PTFE aqueous solution (PTFE emulsion) having a mass fraction of 0.1 to 5%.
Preferably, the curing step: and (3) putting the metal bipolar plate subjected to the coating step into a muffle furnace, and curing at the temperature of 200-450 ℃ for 30s-15min, preferably 1-10 min.
After the anti-corrosion liquid is coated on the welding line of the metal bipolar plate, the anti-corrosion liquid stays at the welding line of the metal bipolar plate for 30s-5min (the anti-corrosion liquid carries out anti-corrosion hydrophobic treatment on the welding line, here, the contact time of the anti-corrosion liquid and the bipolar plate is too short to facilitate the uniform adsorption of the solution on the surface of the bipolar plate, and after curing, the phenomena of bubbles, non-uniformity, non-density and the like are easy to appear on a film layer.
Preferably, the coating step and the curing step are carried out at least once, and preferably, the coating step and the curing step are carried out repeatedly for multiple times (namely, after the coating step and the curing step are carried out once, the coating step and the curing step are carried out again, and the like), until the loading of the anti-corrosion layer on the metal bipolar plate reaches the set loading; wherein the loading amount refers to the mass of the corrosion protection layer loaded per unit area of the weld line on the metallic bipolar plate. Preferably, the set loading is 0.1-10mg/cm2More preferably 1 to 3mg/cm2. The quality of the corrosion protection layer can be improved hereThe quality of the metal bipolar plate before and after the anticorrosion treatment is poor.
In another aspect, embodiments of the present invention provide a metallic bipolar plate, wherein the metallic bipolar plate includes a metallic bipolar plate body and a corrosion protection layer; the metal bipolar plate body is provided with a welding wire; the anti-corrosion layer covers the welding lines of the metal bipolar plate body. The thickness of the anti-corrosion layer is 2-20 nm; the loading capacity of the anti-corrosion layer is 0.1-10mg/cm2More preferably 1 to 3mg/cm2. The welding wire is a laser welding wire; the metal bipolar plate body is formed by welding a cathode single plate and an anode single plate; here, the cathode single plate and the anode single plate are both metal substrates with a coating deposited on the surfaces. The metal bipolar plate body is subjected to the welding and anti-corrosion treatment method of any one of the metal bipolar plates to obtain the metal bipolar plate.
The invention is further illustrated by the following specific experimental examples:
example 1
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.30 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 45 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.1% PTFE aqueous solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) for 4 times (namely, repeatedly spraying the PTFE solution on the welding wire and carrying out curing treatment for 4 times) to obtain the metal bipolar plate after the welding wire is subjected to the anti-corrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 2mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.1m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 2.0 ppm.
Example 2
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.0 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 55 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.5% PTFE aqueous solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) twice (namely, repeating the steps of spraying the PTFE solution on the welding wire and carrying out curing treatment twice), so as to obtain the metal bipolar plate after the welding wire is subjected to the anti-corrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 1.8mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.0m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 2.0 ppm.
Example 3
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.8 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 55 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.1% PTFE aqueous solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 400 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) for 4 times (namely, repeatedly spraying the PTFE solution on the welding wire and carrying out curing treatment for 4 times) to obtain the metal bipolar plate after the welding wire is subjected to the anti-corrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 1.8mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.6m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 2.3 ppm.
Example 4
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 4.3 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was found to be 52 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.1% PTFE aqueous solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) twice (namely, repeatedly spraying the PTFE solution on the welding wire and carrying out curing treatment for 2 times) to obtain the metal bipolar plate after the welding wire is subjected to the anti-corrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 1.1mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 4.1m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 3.3 ppm.
Example 5
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.7 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 60 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) The metal bipolar plate and the baffle plate are overlapped together to form a composite structure, and the composite structure is fixedAnd (4) determining. And spraying a 3% PTFE aqueous solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out to obtain the metal bipolar plate subjected to the welding wire anticorrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 2.3mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.5m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the iron ion content in the sulfuric acid solution is measured to be 1.8 ppm.
Example 6
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.30 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 45 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.1% chloroplatinic acid ethanol solution to the side of the baffle plate in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) for four times (namely, repeatedly spraying the PTFE solution on the welding wire and carrying out curing treatment for 4 times) to obtain the metal bipolar plate after the welding wire anticorrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 2mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.1m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 2.3 ppm.
Example 7
Selecting a hydrogen pole plate (anode single plate) and an air pole plate (cathode single plate) of the metal bipolar plate respectively, determining a welding process, and then performing laser welding on the hydrogen pole plate and the air pole plate to form the metal bipolar plate. The metal bipolar plate was tested to have a contact resistance of 3.30 m.OMEGA.. cm2. Further, the metal bipolar plate was placed in a 0.5M sulfuric acid solution and heated at 80 ℃ for 2 hours, and the iron ion content in the sulfuric acid solution was measured to be 45 ppm. And taking out the metal bipolar plate, ultrasonically cleaning the metal bipolar plate by using pure water, and drying the metal bipolar plate for later use.
The method for performing the anti-corrosion treatment on the welding line of the metal bipolar plate specifically comprises the following steps:
1) according to the welding process, a weld line may appear on the hydrogen plate of the metal bipolar plate, while the surface of the air plate is smooth and has no weld line. A316L metal plate with the thickness of 0.1mm is taken as a baffle, a welding process and a welding wire of the metal bipolar plate are combined, and a laser cutting machine is adopted to perform hollowed-out cutting on the baffle, so that the welding wire can be completely exposed from the hollowed-out part of the baffle after the baffle and the metal bipolar plate are spliced.
2) And (3) overlapping the metal bipolar plate and the baffle plate together to form a composite structure, and fixing the composite structure. And spraying 0.1% chloroiridate ethanol solution to the side of the baffle in the composite structure in an ultrasonic spraying mode. And after the spraying is finished, separating the metal bipolar plate from the baffle, transferring the metal bipolar plate into a muffle furnace, curing at the temperature of 300 ℃ for 10min, and taking out.
3) And (3) repeating the step 2) for four times (namely, repeatedly spraying the PTFE solution on the welding wire and carrying out curing treatment for 4 times) to obtain the metal bipolar plate after the welding wire anticorrosion treatment. The loading capacity of the anti-corrosion layer on the metal bipolar plate after the anti-corrosion treatment of the welding wire is determined to be 2mg/cm2。
The metal bipolar plate after the anti-corrosion treatment of the welding wire obtained in the embodiment is tested, and the contact resistance of the metal bipolar plate is measured to be 3.2m omega cm2. The metal bipolar plate after the corrosion-resistant treatment of the welding wire is put into a 0.5M sulfuric acid solution and heated for 2 hours at the temperature of 80 ℃, and the content of iron ions in the sulfuric acid solution is measured to be 2.4 ppm.
As is evident from the experimental data of examples 1-7: after the anticorrosion treatment of the welding wire anticorrosion treatment method of the metal bipolar plate, the corrosion resistance of the metal bipolar plate is greatly improved. Here, the contact resistance of the metal bipolar plate of the above embodiment before and after the anti-corrosion treatment is slightly reduced or unchanged (here, the heat treatment (curing) in the anti-corrosion treatment method step can further improve the bonding force of the coating layer and the substrate, so that the contact resistance of the metal bipolar plate before and after the anti-corrosion treatment is slightly reduced or unchanged).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (25)
1. A method for the anticorrosion treatment of a welding wire of a metal bipolar plate is used for the anticorrosion treatment of the welding wire on the metal bipolar plate and is characterized by comprising the following steps:
coating: coating the anti-corrosion liquid on the welding line of the metal bipolar plate;
and (3) curing: curing the anti-corrosion liquid coated at the welding line of the metal bipolar plate to form an anti-corrosion layer on the surface of the welding line of the metal bipolar plate;
wherein the coating step comprises:
step 1): overlapping the baffle plate on the metal bipolar plate; the position of the baffle corresponding to the welding line is set to be a hollow part, so that the welding line on the metal bipolar plate is completely exposed, and the non-welding line of the metal bipolar plate is shielded by the baffle;
step 2): coating an anti-corrosion liquid on the welding line;
step 3): separating the baffle from the metallic bipolar plate.
2. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in claim 1, wherein in said coating step:
and coating the anti-corrosion liquid on the welding line of the metal bipolar plate in a spraying or brushing way.
3. The method for weld line anticorrosion treatment of metal bipolar plate according to claim 2, wherein an anticorrosion solution is applied to the weld line of the metal bipolar plate by ultrasonic spraying.
4. The method for weld line anticorrosion treatment of a metallic bipolar plate according to claim 1, wherein said baffle plate and said metallic bipolar plate are overlapped together by any one of mechanical pressing, bonding and vacuum pressing.
5. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in claim 1, wherein the thickness of said baffle is 0.05-0.5 mm.
6. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in claim 5, wherein said baffle has a thickness of 0.05-0.3 mm.
7. The method for weld line anticorrosion treatment of metallic bipolar plates as claimed in any one of claims 1 to 6, wherein in said coating step:
the anti-corrosion liquid is anti-corrosion hydrophobic liquid so as to form an anti-corrosion hydrophobic layer on the surface of the welding line of the metal bipolar plate.
8. The method for weld line anticorrosion treatment of metallic bipolar plates as claimed in any one of claims 1 to 6, wherein in said coating step:
the anti-corrosion liquid is metal salt solution or organic polymer water solution.
9. The method for performing weld line corrosion prevention treatment on a metallic bipolar plate according to claim 8, wherein the corrosion prevention liquid is any one of a chloroplatinic acid solution, a chloroiridic acid solution and a PTFE solution.
10. The method for the weld line anticorrosion treatment of a metal bipolar plate according to claim 9, wherein the PTFE solution is 0.1-5% by mass of PTFE aqueous solution.
11. The method for weld line anticorrosion treatment of a metallic bipolar plate according to any one of claims 1 to 6 and 9 to 10, wherein after applying an anticorrosion liquid to the weld line, the anticorrosion liquid is allowed to stay at the weld line of the metallic bipolar plate for 30s to 5min, and then a curing step is performed.
12. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in any one of claims 1 to 6, 9 to 10, wherein in said curing step: the curing temperature is 200 ℃ and 450 ℃, and the curing time is 30s-15 min.
13. The method for the weld line anticorrosion treatment of a metallic bipolar plate as claimed in claim 12, wherein the curing time is 1-10 min.
14. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in claim 12,
the curing step is carried out in a muffle furnace; and/or
The thickness of the anti-corrosion layer is 2-20 nm.
15. The method for weld line anticorrosion treatment of a metallic bipolar plate as claimed in any one of claims 1 to 6, 9 to 10, 13 to 14, wherein said coating step and said curing step are performed in a cycle of plural times.
16. The method for weld line corrosion prevention treatment of a metallic bipolar plate according to any one of claims 1 to 6, 9 to 10, and 13 to 14, wherein the loading amount of the corrosion prevention layer on the metallic bipolar plate is a set loading amount; wherein the loading amount of the corrosion protection layer refers to the mass of the corrosion protection layer loaded per unit area of the weld line on the metal bipolar plate.
17. The method for weld line anticorrosion treatment of metallic bipolar plate of claim 16, wherein said set loading amount is 0.1-10mg/cm2。
18. The method for weld line anticorrosion treatment of metal bipolar plate of claim 17, wherein said set loading amount is 1-3mg/cm2。
19. A metallic bipolar plate, comprising:
a metal bipolar plate body having a weld line thereon;
the anti-corrosion layer covers the welding line of the metal bipolar plate body;
wherein the metal bipolar plate body is subjected to corrosion prevention treatment by the method for performing weld line corrosion prevention treatment on the metal bipolar plate according to any one of claims 1 to 18 to obtain the metal bipolar plate.
20. The metallic bipolar plate of claim 19 wherein said corrosion protection layer has a thickness of 2 nm to 20 nm.
21. The metallic bipolar plate of claim 19,
the loading capacity of the anti-corrosion layer is 0.1-10mg/cm2。
22. The metallic bipolar plate of claim 21 wherein said corrosion protection layer is present in an amount of 1 to 3mg/cm2。
23. The metallic bipolar plate of claim 19 wherein said weld line is a laser weld line.
24. The metallic bipolar plate of claim 19 wherein said metallic bipolar plate body is formed by welding a cathode single plate and an anode single plate.
25. The metallic bipolar plate of claim 24, wherein said cathode single plate and/or said anode single plate is a coated surface-modified metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104695.3A CN111354956B (en) | 2020-02-20 | 2020-02-20 | Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104695.3A CN111354956B (en) | 2020-02-20 | 2020-02-20 | Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111354956A CN111354956A (en) | 2020-06-30 |
| CN111354956B true CN111354956B (en) | 2021-04-27 |
Family
ID=71197067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010104695.3A Active CN111354956B (en) | 2020-02-20 | 2020-02-20 | Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111354956B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0154772B1 (en) * | 1984-01-26 | 1988-08-03 | BBC Brown Boveri AG | Bipolar plate for an apparatus made of a stack of electrochemical cells with solid electrolyte, and its manufacturing process |
| DE10300751A1 (en) * | 2003-01-11 | 2004-07-22 | Chemetall Gmbh | Process for coating metallic surfaces, coating composition and coatings produced in this way |
| US8089027B2 (en) * | 2004-05-11 | 2012-01-03 | GM Global Technology Operations LLC | Laser welding of conductive coated metallic bipolar plates |
| US7267869B2 (en) * | 2004-07-28 | 2007-09-11 | Leo Kriksunov | Conductive corrosion-resistant coating |
| CN105140544B (en) * | 2015-08-28 | 2018-08-03 | 航天新长征电动汽车技术有限公司 | A kind of metal double polar plates and preparation method thereof |
| GB2554387B (en) * | 2016-09-23 | 2019-04-17 | Univ Cape Town | A fuel cell component |
| CN108470931A (en) * | 2018-03-15 | 2018-08-31 | 大连交通大学 | A kind of fuel cell metal double polar plates surface corrosion-resistant erosion method of modifying |
-
2020
- 2020-02-20 CN CN202010104695.3A patent/CN111354956B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111354956A (en) | 2020-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2020522873A (en) | Joint between copper terminal and aluminum wire and ultrasonic welding method | |
| KR101319095B1 (en) | Battery current collector foil, method of manufacturing battery current collector foil, and battery | |
| CN107017383A (en) | It is a kind of to be applied to battery, the three-dimensional porous aluminium foil processing method of energy-storage battery plus plate current-collecting body | |
| CN107033738A (en) | A kind of preparation method of modified silicon nitride corrosion-inhibiting coating | |
| Cooper et al. | Titanium nitride polyaniline bilayer coating for metallic bipolar plates used in polymer electrolyte fuel cells | |
| CN111354956B (en) | Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate | |
| WO2015152379A1 (en) | Composite metal foil for fuel cell separator, fuel cell separator, fuel cell, and method for producing composite metal foil for fuel cell separator | |
| JP2004139951A (en) | Separator for fuel cell and its manufacturing method | |
| JPH11345618A (en) | Coating metal separator material for solid polymer fuel cell | |
| JP2003082488A (en) | Membrane-electrode assembly and its manufacturing method | |
| CN111200136B (en) | Anti-corrosion treatment method for welding wire of metal bipolar plate and metal bipolar plate | |
| JP2011520237A (en) | Method for activating membrane electrode assembly, membrane electrode assembly and polymer electrolyte fuel cell using the same | |
| CN111900426B (en) | Fuel cell bipolar plate anticorrosive coating and preparation method thereof | |
| JP2005347282A (en) | Separator for solid polymer fuel cell and fuel cell | |
| CN101859904B (en) | Manufacturing method of Fe-Ni-Cr alloy fuel cell bi-polar plate | |
| JP5138912B2 (en) | Fuel cell separator and manufacturing method thereof | |
| CN107254705B (en) | Preparation process of nano TiN-PANI composite conductive polymer coating | |
| CN116329756B (en) | 3D printing construction method of corrosion-resistant weld joint structure | |
| JP6970495B2 (en) | Stainless steel sheet carbon composite material and its manufacturing method | |
| WO2010128676A1 (en) | Fuel cell separator and method for producing same | |
| CN219553674U (en) | Current collector, battery pole piece and battery | |
| JP2003308848A (en) | Method for manufacturing catalyst carrying electrode, and electrochemical device and fuel cell using it | |
| JP7448522B2 (en) | Composite material and its manufacturing method, as well as separators, cells and stacks for fuel cells using the composite material | |
| JP2020095795A (en) | Manufacturing method of separator | |
| CN211907583U (en) | Metal-based composite bipolar plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |