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A Multilayer Composite Carbon Coating for Highly Corrosion-Resistant Fuel Cell Bipolar Plates

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

Active Publication Date: 2022-03-15
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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  • A Multilayer Composite Carbon Coating for Highly Corrosion-Resistant Fuel Cell Bipolar Plates
  • A Multilayer Composite Carbon Coating for Highly Corrosion-Resistant Fuel Cell Bipolar Plates
  • A Multilayer Composite Carbon Coating for Highly Corrosion-Resistant Fuel Cell Bipolar Plates

Examples

Experimental program
Comparison scheme
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 multi-layer composite carbon coating of a fuel cell bipolar plate with high corrosion resistance, comprising: a diffusion-infiltration layer covering the surface of the metal base material of the bipolar plate; a dense layer covering the upper surface of the diffusion-infiltration layer Corrosion-resistant layer; and the performance control layer covering the upper surface of the dense corrosion-resistant layer; the material of the diffusion and penetration layer is C, N, Si, SiC, SiO 2 and Si 3 N 4 One or a mixture of two or more of them; the material of the dense corrosion-resistant layer is composed of amorphous carbon with a mass fraction ≥ 80%, hydrogen ≤ 20% and oxygen ≤ 5%; the material of the performance regulation layer includes The mass fraction is 80%~99% of C element, doped with 0~10% of Si element, 0~10% of F element, 0~5% of O element, 0~10% of N element, 1%~20 % H element; the inside or surface of the dense corrosion-resistant layer is embedded with randomly distributed diamond particles or diamond-like carbon particles.

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 Patents(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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