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High-corrosion-resistance multilayer composite carbon coating of fuel cell bipolar plate

A multi-layer composite and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of high potential corrosion, metal layer oxidation and limited application environment, etc., achieve low preparation cost and avoid the decline of coating conductivity , the effect of excellent stability

Active Publication Date: 2021-03-30
SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-layer composite carbon coating of a fuel cell bipolar plate with high corrosion resistance, so as to overcome the problems of high potential corrosion, metal layer oxidation and limited application environment in the prior art

Method used

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  • High-corrosion-resistance multilayer composite carbon coating of fuel cell bipolar plate

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A multi-layer composite carbon coating for highly corrosion-resistant fuel cell bipolar plates, the structure of which is as follows figure 1 as shown,

[0029] (1) Carrying out plasma carburizing on the metal substrate 1 of the bipolar plate to generate a diffusion infiltration layer 2 composed of 90% C by mass fraction and 10% SiC by mass fraction;

[0030] (2) Then, on the surface of the diffusion and penetration layer 2, a dense corrosion-resistant layer composed of 95% amorphous carbon, 3% hydrogen and 2% oxygen is deposited by plasma-assisted chemical vapor deposition. 3. Diamond particles or diamond-like carbon particles are embedded in or on the surface of the dense corrosion-resistant layer 3, and its coverage on the surface of the dense corrosion-resistant layer 3 is 40%;

[0031] (3) Finally, on the surface of the dense corrosion-resistant layer 3, deposit a layer of C element with a mass fraction of 95%, doped with 2% O and 3% N to form a performance regula...

Embodiment 2

[0033] A multi-layer composite carbon coating for highly corrosion-resistant fuel cell bipolar plates, the structure of which is as follows figure 2 as shown,

[0034](1) Carry out plasma carburizing on bipolar plate metal base material 1 and generate Si by mass fraction 97% C and mass fraction 3% 3 N 4 Diffusion and penetration layer 2 composed of materials;

[0035] (2) Then, on the surface of the diffusion and penetration layer 2, a layer of dense corrosion-resistant material composed of 95% amorphous carbon, 3% hydrogen and 2% oxygen is sequentially deposited by plasma-assisted chemical vapor deposition. Layer 3 and a performance control layer 4 composed of 90% C element doped with 3% Si, 3% O and 4% N; diamonds are embedded in the inner or surface of the dense corrosion-resistant layer 3 Particles or diamond-like carbon particles, whose coverage on the surface of the dense corrosion-resistant layer 3 is 5%;

[0036] (3) A layer of amorphous carbon with a mass fractio...

Embodiment 3

[0039] A multi-layer composite carbon coating for highly corrosion-resistant fuel cell bipolar plates, the structure of which is as follows figure 1 as shown,

[0040] (1) Carrying out plasma carburizing on the metal substrate 1 of the bipolar plate to form a diffusion infiltration layer 2 composed of SiC with a mass fraction of 95% and N materials with a mass fraction of 5%;

[0041] (2) Then, on the surface of the diffusion and penetration layer 2, a dense corrosion-resistant layer composed of 90% amorphous carbon, 7% hydrogen and 3% oxygen is deposited by plasma-assisted chemical vapor deposition. 3; diamond particles or diamond-like carbon particles are embedded inside or on the surface of the dense corrosion-resistant layer 3, and its coverage on the surface of the dense corrosion-resistant layer 3 is 17%; in the dense corrosion-resistant layer 3, the mass fraction is randomly distributed. 4% flake graphite;

[0042] (3) Finally, on the surface of the dense corrosion-re...

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Abstract

The invention provides a high-corrosion-resistance multilayer composite carbon coating of a fuel cell bipolar plate. The high-corrosion-resistance multilayer composite carbon coating comprises a diffusion permeation layer covering the surface of a bipolar plate metal base material, a compact corrosion-resistant layer which covers the upper surface of the diffusion permeation layer; and a performance regulation and control layer which covers the upper surface of the compact corrosion-resistant layer; the diffusion permeation layer is made of one or a mixture of more than two of C, N, Si, SiC, SiO2 and Si3N4; the compact corrosion-resistant layer is prepared from the following materials in percentage by mass: more than or equal to 80 percent of amorphous carbon, less than or equal to 20 percent of hydrogen element and less than or equal to 5 percent of oxygen element; the performance regulation and control layer is prepared from the following materials in percentage by mass: 80 to 99 percent of C element, 0 to 10 percent of doped Si element, 0 to 10 percent of F element, 0 to 5 percent of O element, 0 to 10 percent of N element and 1 to 20 percent of H element; diamond particles or diamond-like carbon particles which are randomly distributed are embedded in the compact corrosion-resistant layer or on the surface of the compact corrosion-resistant layer.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a multi-layer composite carbon coating of a fuel cell bipolar plate with high corrosion resistance. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC for short) uses hydrogen as fuel to generate electricity, and the product is water pollution-free, very friendly to the environment, and its application range includes automobiles, drones, and fixed power stations. In the proton exchange membrane fuel cell stack, the fuel cell bipolar plate plays an important role, mainly responsible for gas distribution, heat conduction and certain support, accounting for 80% of the weight of the stack and 45% of the cost of the stack. Among the numerous bipolar plate materials for proton exchange membrane fuel cells, there are metals, graphites, and composite materials. Metal bipolar plates have excellent electrical and thermal conductivity and good mechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0228H01M8/0243H01M8/0245
CPCH01M8/0228H01M8/0213H01M8/0243H01M8/0245Y02E60/50
Inventor 黎焕明毕飞飞姜天豪胡鹏蓝树槐
Owner SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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