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Method for improving conductivity and corrosion resistance of fuel cell bipolar plate carbide coating layer

A fuel cell and carbide technology, used in fuel cell parts, fuel cells, electrochemical generators, etc., can solve the problem of increasing the cost of coating preparation, complex process, corrosion resistance and electrical conductivity of metal carbide coatings performance improvement and other issues to achieve the effect of reducing execution complexity, increasing surface roughness, and improving corrosion resistance and electrical conductivity.

Inactive Publication Date: 2018-09-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methods for improving the performance of metal carbide coatings in the above-mentioned published patents are relatively complicated, which increases the cost of coating preparation, and does not directly use the etching process to improve the corrosion resistance and conductivity of metal carbide coatings. to improve

Method used

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  • Method for improving conductivity and corrosion resistance of fuel cell bipolar plate carbide coating layer
  • Method for improving conductivity and corrosion resistance of fuel cell bipolar plate carbide coating layer
  • Method for improving conductivity and corrosion resistance of fuel cell bipolar plate carbide coating layer

Examples

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Effect test

Embodiment 1

[0028] The stainless steel bipolar plate is used as the substrate, and the titanium carbide coating is prepared on its surface. The process is as follows:

[0029]1) Plate pretreatment: use deionized water, acetone, and absolute ethanol in sequence to ultrasonically clean the surface of the stainless steel bipolar plate and dry it;

[0030] 2) Hang the pretreated stainless steel bipolar plate on the planetary turret platform in the unbalanced magnetron sputtering ion plating furnace cavity, keep the turret speed at 4r / min, and evacuate to the background vacuum of 3*10 -5 After Torr, fill with argon and keep the working pressure at 4*10 -4 Torr, apply a bias voltage of -500V to the stainless steel substrate, so that the ions continue to bombard the surface of the substrate, clear the passivation layer on the surface, and the cleaning time is 30 minutes;

[0031] 3) Introduce 20 sccm of argon as a protective gas, and 20 sccm of reaction gas acetylene for 30 minutes, keep the su...

Embodiment 2

[0035] The stainless steel bipolar plate is used as the substrate, and the titanium carbide coating is prepared on the surface, and the corrosion resistance and conductivity of the titanium carbide coating are improved by wet etching. The process is as follows:

[0036] 1) Plate pretreatment: use deionized water, acetone, and absolute ethanol in sequence to ultrasonically clean the surface of the stainless steel bipolar plate and dry it;

[0037] 2) Suspend the pretreated stainless steel bipolar plate on the planetary turret platform in the unbalanced magnetron sputtering ion plating furnace cavity, vacuumize to the background vacuum, fill it with argon, and apply bias on the stainless steel substrate. pressure, so that the ions continue to bombard the surface of the substrate, and the cleaning time is 30 minutes;

[0038] 3) Pass the working gas and the reaction gas into the vacuum container at the same time, and deposit the titanium carbide coating on the surface of the stai...

Embodiment 3

[0042] The stainless steel bipolar plate is used as the substrate, and the titanium carbide coating is prepared on the surface, and the corrosion resistance and conductivity of the titanium carbide coating are improved by wet etching. The process is as follows:

[0043] 1) Plate pretreatment: use deionized water, acetone, and absolute ethanol in sequence to ultrasonically clean the surface of the stainless steel bipolar plate and dry it;

[0044] 2) Suspend the pretreated stainless steel bipolar plate on the planetary turret platform in the unbalanced magnetron sputtering ion plating furnace cavity, vacuumize to the background vacuum, fill it with argon, and apply bias on the stainless steel substrate. pressure, so that the ions continue to bombard the surface of the substrate, and the cleaning time is 30 minutes;

[0045] 3) Pass the working gas and the reaction gas into the vacuum container at the same time, and deposit the titanium carbide coating on the surface of the stai...

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Abstract

The invention relates to a method for improving the conductivity and corrosion resistance of a fuel cell bipolar plate carbide coating layer. The method includes: sequentially depositing a metal transition layer and a metal carbide coating layer on the surface of a metal bipolar plate, etching the coated bipolar plate to change the surface structure and composition of the carbide coating layer, and cleaning and drying to obtain the carbide coating layer with improved corrosion resistance and conductivity. Compared with the prior art, the method has the advantages that the etching technology isused to optimize the performance of the coating layer of the coated metal bipolar plate, coupling influence caused by parameter regulation during coating layer preparation is avoided, and accordinglythe method is applicable to the further improvement of the performance of the fuel cell bipolar plate carbide coating layer so as to allow the coating layer to meet the working requirements of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for improving the conductivity and corrosion resistance of a carbide coating on a fuel cell bipolar plate. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) has been widely used in the fields of transportation, national defense, and electronic products due to its high conversion efficiency, no pollution to the environment, low operating temperature, and long operating life. In the structure of the proton exchange membrane fuel cell, the bipolar plate takes up most of the space and cost, and the service environment of the fuel cell is a 4 2- , Cl - , F - The high temperature (60-90°C) and strongly acidic (pH=1-3) environment of the plasma puts forward higher requirements on the physical and chemical properties of the bipolar plate: the ideal bipolar plate material must be electrical and thermal It is a good conductor, has good gas barrier pro...

Claims

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Application Information

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IPC IPC(8): H01M8/021H01M8/0213H01M8/0228
CPCH01M8/021H01M8/0213H01M8/0228H01M8/0206H01M8/0215Y02E60/50
Inventor 易培云黎焕明彭林法邱殿凯来新民
Owner SHANGHAI JIAO TONG UNIV
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