A kind of metal bipolar plate and its preparation method and fuel cell
A metal bipolar plate and metal substrate technology, which is applied in the direction of fuel cells, fuel cell parts, metal material coating technology, etc., can solve the problem of limited pore sealing ability inside the corrosion-resistant coating, slow film deposition speed, ionization Low efficiency and other problems, to achieve the effect of excellent coating adhesion, good compactness and excellent performance
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[0063] On the other hand, the embodiment of the present invention also provides a method for preparing a metal bipolar plate, which specifically includes the following steps:
[0064] 1. Pretreatment: Pretreatment is performed on the metal substrate to improve the cleanliness and surface roughness of the metal substrate. This step specifically includes:
[0065] 11) The first step of pretreatment: the metal substrate is degreased, polished, cleaned and dried in sequence. Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, the substrate is polished with a brightener such as alumina polishing paste or diamond polishing paste. On the one hand, the oxide skin on the surface is removed, and on the other hand, the surface texture and defects are reduced by polishing treatment to improve the flatness of ...
Embodiment 1
[0079] The metal substrate of this embodiment is selected from 316L stainless steel. The steps of depositing a coating on the metal substrate and preparing a metal bipolar plate are as follows:
[0080] 1) Degrease, polish, clean and dry the metal substrate in sequence.
[0081] Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, the substrate is polished with a brightener such as diamond polishing paste. On the one hand, the oxide skin on the surface is removed, and on the other hand, the surface texture and defects are reduced by polishing, and the flatness of the material is improved. Clean with pure water after polishing, and store the cleaned metal substrate in pure water, and blow it with clean nitrogen before use.
[0082] 2) Using bias magnetron arc ion coating equipment, the metal substr...
Embodiment 2
[0088] The metal substrate of this embodiment is selected from 316L stainless steel. The steps of depositing a coating on the metal substrate and preparing a metal bipolar plate are as follows:
[0089] 1) Degrease, polish, clean and dry the metal substrate in sequence.
[0090] Specifically, the first degreasing treatment is performed on the selected metal substrate with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, the substrate is polished with a brightener such as alumina polishing paste. On the one hand, the oxide skin on the surface is removed, and on the other hand, the surface texture and defects are reduced by polishing, and the flatness of the material is improved. Clean with pure water after polishing, and store the cleaned metal substrate in pure water, and blow it with clean nitrogen before use.
[0091] 2) Using bias magnetron arc ion coating equipment, the metal substr...
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Abstract
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