Protective coating for metal bipolar plate and preparation method thereof

A metal bipolar plate and protective coating technology, used in fuel cell parts, collectors/separators, etc., can solve problems such as poor corrosion resistance and increased contact resistance, and achieve improved electrical conductivity, reduced contact resistance, The effect of strong acid corrosion resistance

Active Publication Date: 2022-06-07
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application provides a protective coating for metal bipolar plates and its preparation method to solve the technical problems of poor corrosion resistance and increased contact resistance in the application of metal bipolar plates

Method used

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  • Protective coating for metal bipolar plate and preparation method thereof
  • Protective coating for metal bipolar plate and preparation method thereof
  • Protective coating for metal bipolar plate and preparation method thereof

Examples

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preparation example Construction

[0041] According to a typical embodiment of the present invention, the present application provides the preparation method of the protective coating, such as figure 1 As shown, the method includes the following steps:

[0042] S1. The metal bipolar plate to be treated is placed in a vacuum chamber, and the vacuum chamber is provided with an arc evaporation graphite target and a magnetron sputtering metal target;

[0043] S2. The to-be-treated metal bipolar plate is treated with a magnetron sputtering metal target to obtain a first metal bipolar plate containing a transition layer, and the magnetron sputtering metal target includes a Ti target or a Cr target;

[0044] S3. The first metal bipolar plate is treated with an arc evaporation graphite target to obtain an amorphous carbon layer containing conductive carbon particles, wherein the amorphous carbon layer and the transition layer constitute the protective coating, and the protective The coating covers the to-be-treated me...

Embodiment 1

[0065] The embodiment of the present application provides a protective coating for a titanium foil bipolar plate, the protective coating covers the surface of the bipolar plate substrate, the protective coating includes a transition layer and an amorphous carbon layer, the non-crystalline carbon layer The crystalline carbon layer covers the transition layer, and the transition layer is combined with the bipolar plate base, wherein the composition of the transition layer is Ti. The thickness of the transition layer is about 120 nm, the thickness of the amorphous carbon layer is about 200 nm, and the amorphous carbon layer contains conductive carbon particles.

[0066] The preparation method of described protective coating, described method comprises the following steps:

[0067] S1. The titanium foil bipolar plate to be treated is placed in a vacuum chamber, and an arc evaporation source and a magnetron sputtering metal target are arranged in the vacuum chamber;

[0068] S2. T...

Embodiment 2

[0077] The difference between Example 2 and Example 1 is that: when an amorphous carbon layer containing conductive carbon particles is prepared by using an arc evaporation high-purity graphite target on the Ti crossing layer, the flow rate of argon gas is set to 300sccm, and the bias voltage is set to -25V. , turn on the arc cathode power supply, set the target current to 90A, and set the time to 2 minutes to obtain an amorphous carbon layer with a thickness of about 200nm.

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Abstract

The invention belongs to the field of fuel cell metal bipolar plates, and particularly relates to a protective coating for a metal bipolar plate and a preparation method of the protective coating. The protective coating covers the surface of a metal bipolar plate base body, the protective coating comprises a transition layer and an amorphous carbon layer, the transition layer is covered with the amorphous carbon layer, the transition layer is combined with the metal bipolar plate base body, and the transition layer comprises at least one of Ti and Cr. The design of the transition layer can improve the bonding reliability of the protective coating on the surface of the metal bipolar plate, the amorphous carbon layer has good conductivity and corrosion resistance, and the problem of poor conductivity caused by surface oxidation of the metal bipolar plate can be solved; and finally, the average corrosion current density of the metal bipolar plate can be less than 0.03 [mu] A/cm < 2 > (keeping for 24 hours under constant potential polarization of 0.6 V), and the interface contact resistance is less than 2 m omega.cm < 2 > (under 1.4 MPa).

Description

technical field [0001] The invention belongs to the field of metal bipolar plates of fuel cells, and in particular relates to a protective coating for metal bipolar plates and a preparation method thereof. Background technique [0002] A fuel cell is an energy conversion device and is regarded as one of the clean energy sources with great development potential. It directly converts the chemical energy stored in the fuel and oxidant into electrical energy isothermally by means of an electrochemical reaction. A battery fueled by hydrogen or hydrogen-rich gas is a hydrogen fuel cell, which has the advantages of high efficiency, environmental friendliness, energy safety, simple structure, high reliability and good compatibility. [0003] As a key component of hydrogen fuel cells, bipolar plates, their materials, mass, volume, life and cost have always been the focus of industry development. Currently, graphite and metal are two common materials used for bipolar plates. Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0202
CPCH01M8/0202Y02E60/50
Inventor 尚伦霖张广安勾荣年李东山曹学乾
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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