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Metal bipolar plate and preparation method thereof and fuel cell

A metal bipolar plate and metal substrate technology, which is used in fuel cells, fuel cell parts, metal material coating processes, etc., can solve the problem of limited pore sealing ability in corrosion-resistant coatings, slow film deposition speed, and coating time. Long and other problems, to achieve the effect of excellent corrosion resistance and electrical conductivity, prevent oxidation, and improve the coating speed

Active Publication Date: 2020-02-18
浙江锋源氢能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing technology also proposes a repair plan for pinhole defects, the existing repair plan can only seal the pores on the surface of the corrosion-resistant coating, and has limited ability to seal the internal pores of the corrosion-resistant coating.
[0007] (3) Due to the relatively low ionization efficiency, the film deposition rate is relatively slow. Generally, the deposition rate is only a few nanometers per minute, resulting in a relatively long overall coating time.

Method used

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  • Metal bipolar plate and preparation method thereof and fuel cell
  • Metal bipolar plate and preparation method thereof and fuel cell

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preparation example Construction

[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: Perform pretreatment operations on the metal substrate to improve the cleanliness and surface roughness of the metal substrate. This step specifically includes:

[0065] 11) The first pretreatment: degreasing, polishing, cleaning, and drying treatments are performed on the metal substrate in sequence. Specifically, the selected metal substrate is subjected to the first degreasing treatment with 1M sodium hydroxide solution at high temperature (80° C.); after cleaning, the second degreasing cleaning is performed with alcohol. Then, polish the substrate with brighteners such as alumina polishing paste or diamond polishing paste. On the one hand, the oxide scale on the surface is taken out, and on the other hand, the surface texture and defects are reduced by polishing treatment to impr...

Embodiment 1

[0079] 316L stainless steel is selected as the metal substrate of this embodiment. The steps of depositing a coating on the metal substrate to prepare a metal bipolar plate are as follows:

[0080] 1) Degreasing, polishing, cleaning, and drying treatments are performed on the metal substrate in sequence.

[0081] Specifically, the selected metal substrate is subjected to the first degreasing treatment 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 scale on the surface is taken out, and on the other hand, the surface texture and defects are reduced by polishing, and the flatness of the material is improved. After polishing, clean it with pure water, and put the cleaned metal substrate in pure water for storage, and purge it with clean nitrogen before use.

[0082] 2) Using bias magnetr...

Embodiment 2

[0088] 316L stainless steel is selected as the metal substrate of this embodiment. The steps of depositing a coating on the metal substrate to prepare a metal bipolar plate are as follows:

[0089] 1) Degreasing, polishing, cleaning, and drying treatments are sequentially performed on the metal substrate.

[0090] Specifically, the selected metal substrate is subjected to a first degreasing treatment at a high temperature (80° C.) with a 1M sodium hydroxide solution; after cleaning, the second degreasing cleaning is performed with alcohol. Then, polish the substrate with a brightener such as alumina polishing paste. On the one hand, the oxide scale on the surface is taken out, and on the other hand, the surface texture and defects are reduced by polishing treatment, and the flatness of the material is improved. After polishing, clean it with pure water, and put the cleaned metal substrate in pure water for storage, and purge it with clean nitrogen before use.

[0091] 2) Using bias...

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Abstract

The invention relates to a metal bipolar plate and a preparation method thereof and a fuel cell, and relates to the technical field of fuel cells. The main adopted technical scheme is that the metal bipolar plate comprises a metal substrate, a Cu nano layer, a graphene layer and an amorphous carbon film. The Cu nano layer is deposited on the metal substrate, the graphene layer is prepared on the Cu nano layer and the amorphous carbon film is deposited on the graphene layer. The fuel cell includes the metal bipolar plate. The metal bipolar plate is mainly used for improving the corrosion resistance and the electrical conductivity of the metal bipolar plate and improving the bonding force between the coating and the metal substrate, thus prolonging the service life of the metal bipolar plateand the fuel cell.

Description

Technical field [0001] The invention relates to the technical field of fuel cells, in particular to a metal bipolar plate, a preparation method thereof, and a fuel cell. Background technique [0002] The bipolar plate is one of the most critical components of the PEMFC stack, and its cost accounts for about 35% of the cost of the stack. Bipolar plates are mainly used to transfer electrons, transfer heat, collect gas, and divide single cells. Therefore, the development of materials with high electrical and thermal conductivity, low gas permeability, high mechanical strength, high corrosion resistance, and easy processing of runners is the main goal of current bipolar plate research. [0003] Compared with carbon-based bipolar plate fuel cells, metal bipolar plate fuel cells have advantages such as high power density. However, due to the harsh working environment of the fuel cell itself, the existing metal materials (including stainless steel, titanium, aluminum alloy and other com...

Claims

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Application Information

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IPC IPC(8): H01M8/0206H01M8/0226H01M8/0228C23C14/02C23C14/16C23C14/32C23C16/26C23C16/455C23C16/50
CPCC23C14/02C23C14/16C23C14/325C23C16/26C23C16/455C23C16/50H01M8/0206H01M8/0226H01M8/0228Y02E60/50
Inventor 上官鹏鹏王海峰王利生
Owner 浙江锋源氢能科技有限公司
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