Method for preparing fuel cell metal bipolar plate flow field through electrochemical etching

A metal bipolar plate and fuel cell technology, applied in fuel cells, electrochemical generators, circuits, etc., can solve problems such as stress corrosion, low processing efficiency, and residual stress of metal plate deformation, so as to improve corrosion resistance and facilitate Process, improve the effect of water management

Active Publication Date: 2020-03-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The metal bipolar plate flow field forming technology generally adopts stamping, molding and laser, etc. The processing cycle is long and the process is complicated, and the processed metal plate is also prone to deformation and residual stress, which may cause stress corrosion.
Some people propose to combine photolithography and electrolytic machining for micro-electrochemical machining of metal workpieces, but micro-electrochemical machining requires high equipment requirements, small processing gaps, low processing efficiency, and the processed bipolar plates still need surface modification, etc. Post-treatment to improve its corrosion resistance

Method used

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  • Method for preparing fuel cell metal bipolar plate flow field through electrochemical etching
  • Method for preparing fuel cell metal bipolar plate flow field through electrochemical etching
  • Method for preparing fuel cell metal bipolar plate flow field through electrochemical etching

Examples

Experimental program
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Effect test

Embodiment example 1

[0025] (1) Experimental pretreatment The experiment selected 316 stainless steel plate of 69*127*1mm as the base material. First, the stainless steel plate was immersed in sodium hydroxide solution for ultrasonic treatment to achieve surface degreasing. After the ultrasonic treatment was completed, the stainless steel plate taken out was deionized Wash with water. (2) Make the anti-corrosion layer. Apply the photosensitive ink evenly on the surface of the stainless steel plate through a scraper coater to ensure uniformity, no bubbles, and no leaks. Bake at 80C for 60 minutes. Paste the printed film on the photosensitive ink, use an 8W iodine-gallium lamp with a lamp distance of 5cm, expose for 5 minutes, and develop with a pre-configured 1% sodium carbonate developer to obtain the desired pattern. Then bake at 155°C for 60 minutes. (3) Electrochemical etching Prepare an electrolyte solution of 16% sodium nitrate, 2% citric acid, 6 mL / l ethylene glycol, and 0.18 g / L saccharin...

Embodiment example 2

[0027] (1) Experimental pretreatment The experiment uses 316 stainless steel plate of 69*127*1mm as the base material. First, immerse the stainless steel plate in sodium hydroxide solution for ultrasonic treatment to achieve surface degreasing. After the ultrasonic treatment is completed, use oxalic acid solution Wash to remove residual lye, and finally wash with deionized water. Observe the surface of the stainless steel plate. If a uniform liquid film is formed on the surface, the degreasing effect is good, otherwise repeat the previous steps. (2) Make the anti-corrosion layer. Apply the photosensitive ink evenly on the surface of the stainless steel plate through a scraper coater to ensure uniformity, no bubbles, and no leaks. Bake at 80 degrees Celsius for 20 minutes. Paste the printed film on the photosensitive ink, use an 8W iodine-gallium lamp with a lamp distance of 5cm, expose for 5 minutes, and develop with a pre-configured 1% sodium carbonate developer to obtain the...

Embodiment example 3

[0029] (1) Experimental pretreatment The experiment uses 316 stainless steel plate of 69*127*1mm as the base material. First, immerse the stainless steel plate in sodium hydroxide solution for ultrasonic treatment to achieve surface degreasing. After the ultrasonic treatment is completed, use oxalic acid solution Wash to remove residual lye, and finally wash with deionized water. Observe the surface of the stainless steel plate. If a uniform liquid film is formed on the surface, the degreasing effect is good, otherwise repeat the previous steps. (2) Make the anti-corrosion layer. Apply the photosensitive ink evenly on the surface of the stainless steel plate through a scraper coater to ensure uniformity, no bubbles, and no leaks. Bake at 80 degrees Celsius for 20 minutes. Paste the printed film on the photosensitive ink, use an 8W iodine-gallium lamp with a lamp distance of 5cm, expose for 5 minutes, and develop with a pre-configured 1% sodium carbonate developer to obtain the...

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Abstract

The invention discloses a fuel cell metal bipolar plate flow field manufacturing method, belongs to the field of fuel cells, and particularly relates to a manufacturing process of a fuel cell metal bipolar plate. According to the method, a required flow channel is etched on the surface of the metal bipolar plate mainly according to the principle of electrochemical anodic dissolution, and a hydrophobic film is plated in a groove after a flow field is etched, so that water management is improved, and the corrosion resistance of the flow field plate is enhanced. And the metal bipolar plate flow field is subjected to electrochemical etching, and a hydrophobic protective film is plated in the flow field groove. And the hydrophobic protective film is any one of a PTFE film, a tridecafluorooctyltriethoxysilane film and a heptadecafluorodecyltriethoxysilane film. The method has the advantages of low cost, short time period, easiness in template modification, convenience in manufacturing and the like. According to the method, continuous manufacturing of different sample bipolar plate flow fields can be achieved, so that continuous fine adjustment of the flow fields is achieved, and the optimal flow field performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for preparing a flow field of a bipolar plate of a fuel cell by electrochemical etching. Background technique [0002] The bipolar plate plays an important role in the proton exchange membrane fuel cell. At the same time, the bipolar plate operates in a high-temperature, acidic, and high-humidity environment. Its performance has a great impact on the quality and cost of the stack. The bipolar plate can effectively reduce the cost of the proton exchange membrane fuel cell and promote its commercialization process. Stainless steel has many excellent properties, and at the same time, the cost is relatively low. The metal bipolar plate made of stainless steel has the advantages of good electrical conductivity, good gas barrier, easy processing and molding, high mechanical strength, and good ductility, so as to improve the performance of PEMFC. Volume, mass po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0258C25F3/06C25F3/14
CPCH01M8/0258C25F3/14C25F3/06Y02P70/50Y02E60/50
Inventor 王新东梁丙炎
Owner UNIV OF SCI & TECH BEIJING
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