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High-entropy alloy composite coating on metal bipolar plate of fuel cell and process

A metal bipolar plate, high-entropy alloy technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as pinhole phenomenon, coating peeling failure, coating pitting corrosion, etc., to extend service life and improve resistance. Effects of Corrosive and Conductive Properties

Active Publication Date: 2017-02-01
SHANGHAI DIANJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mori et al [Moyi Y, Ueda M, Hashimoto M, Aoi Y, Tanase S, Sakai T.Surf.Coat.Technol.2008(202):4094-4101] prepared by electron cyclotron resonance (ECR) plasma sputtering technology Amorphous carbon film, Fu et al [Yu Fu, Guoqiang Lin, Ming Hou. International Journal of Hydrogen Energy.2009,34(1):405-409] prepared Cr-C carbon-based film by arc ion plating method, Chinese patent application No. 201110235087.7 ​​used the unbalanced magnetron sputtering ion plating method to prepare a high sp2 hybrid dense carbon coating on the surface of stainless steel, and the corrosion resistance and electrical conductivity were significantly improved. There are more or less unavoidable pinholes and other defects in the layer. In the fuel cell environment, long-term operation will cause pitting corrosion of the coating, which will cause the coating to fall off and fail.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Using unbalanced magnetron sputtering equipment, the equipment is equipped with 4 DC sources, respectively installed 2 AlCrTaTiZr high-entropy alloy targets and 2 graphite targets. Put the 316 stainless steel substrate sample into the vacuum chamber of the coating machine after cleaning and drying, and vacuumize to 2.5×10 －5 torr, enter argon gas, apply bias voltage to -500V, and perform ion cleaning on the surface of the substrate sample to remove the passivation film on the surface of the stainless steel substrate; then adjust the bias voltage to -100V, high-entropy alloy target current 5A, on the substrate First deposit the bottom layer of high-entropy alloy on the surface; then gradually reduce the current of the high-entropy alloy target, and at the same time turn on the current of the graphite target, and gradually increase it to 6A, the bias voltage is -80V, and deposit the multi-element alloy-carbon mixed transition layer; finally turn off the high-entropy alloy ...

Embodiment 2

[0033] Using unbalanced magnetron sputtering equipment, the equipment is equipped with 2 radio frequency sources and 2 DC sources, among which AlCrFeMnNi high-entropy alloy targets are installed on the radio frequency sources, and 2 graphite targets are installed on the DC sources. Put the 316 stainless steel substrate sample into the vacuum chamber of the coating machine after cleaning and drying, and vacuumize to 2.5×10 －5 torr, enter argon gas, apply bias voltage to -450V, and perform ion cleaning on the surface of the sample to remove the passivation film on the surface of the stainless steel substrate; then adjust the bias voltage to -120V, and the power of the high-entropy alloy target is 300W. First deposit the bottom layer of high-entropy alloy; then gradually reduce the power of high-entropy alloy target, and at the same time turn on the current of graphite target, and gradually increase it to 3A, the bias voltage is -60V, deposit the multi-element alloy-carbon mixed t...

Embodiment 3

[0035] Using unbalanced magnetron sputtering equipment, the equipment is equipped with 2 RF sources and 2 DC sources, among which Ta-Nb targets and Ti-W targets are respectively installed on the 2 RF sources, and Zr targets are respectively installed on the 2 DC sources , Graphite target. Put the 316 stainless steel substrate sample into the vacuum chamber of the coating machine after cleaning and drying, and vacuumize to 2.5×10 －5 torr, enter argon gas, apply bias voltage to -550V, and perform ion cleaning on the surface of the substrate sample to remove the passivation film on the surface of the stainless steel substrate; then adjust the bias voltage to -80V, Ta-Nb target, Ti-W target Add power of 300W and 280W respectively, Zr target current is 4A, first deposit ZrTaNbTiW high-entropy alloy bottom layer on the substrate surface; then gradually reduce the Ta-Nb target, Ti-W target power, reduce the Zr target current, and turn on the graphite target at the same time The curr...

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Abstract

The invention relates to a high-entropy alloy composite coating on a metal bipolar plate of a fuel cell and a preparation method of the high-entropy alloy composite coating. The high-entropy alloy composite coating is prepared on the surface of the metal bipolar plate through adopting a closed-field unbalanced magnetron sputtering technology. The composite coating on the surface of a substrate of the metal bipolar plate is composed of a high-entropy alloy layer, a multi-component alloy-carbon transition layer and an amorphous carbon layer located on the outermost surface. Compared with the prior art, multi-component compounding is carried out by adopting a step-by-step transition method through sufficiently utilizing a high-entropy effect, a delaying diffusing effect and a cocktail party effect of a high-entropy alloy, and electrical conductivity and corrosion resistance of an amorphous carbon film. The modified metal bipolar plate provided by the invention has high film-substrate bonding force, corrosion resistance and electrical conductivity, so that utilization requirements of the metal bipolar plate of the fuel cell are met.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a high-entropy alloy composite coating on a metal bipolar plate of a fuel cell and a preparation method thereof. Background technique [0002] As a kind of clean energy, proton exchange membrane fuel cell (PEMFC) has attracted more and more attention from various countries, and has invested huge sums of money in research and development. PEMFC can directly convert the chemical energy in hydrogen into electrical energy without burning, and the only product is water, which is very friendly to the environment, and the power generation efficiency of the battery pack can reach more than 50%. PEMFC also has the advantages of low operating temperature and fast start-up speed. It is an ideal mobile power supply and independent power supply device. It has broad application prospects in the fields of transportation, electronic products, national defense and military, and fixed power sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8657H01M4/8892Y02E60/50
Inventor 周滔张如林李荣斌
Owner SHANGHAI DIANJI UNIV
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