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Preparation method of metal bipolar plate protective coating for proton exchange membrane fuel cell

A metal bipolar plate and proton exchange membrane technology, which is applied to fuel cell components, fuel cells, battery electrodes, etc., can solve the problems of poor bonding, corrosion of the substrate, and coating failure, and achieves simple process and avoids problems. Phase transformation and deformation, the effect of avoiding coating failure

Active Publication Date: 2016-01-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, defects in single cermet coatings prepared by physical deposition methods such as magnetron sputtering are unavoidable, and the substrate is prone to corrosion, and due to the poor bonding between the coating and the substrate, it is easy to cause the coating to fail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a proton exchange membrane fuel cell metal bipolar plate protective coating of the present invention comprises the following steps:

[0032] (1) Use argon arc welding to weld Fe-Cr wire with a diameter of 1 mm to the surface of the polished 304 stainless steel bipolar plate as the electrode lead. After cleaning with acetone and ethanol, dry it for use.

[0033] (2) Preparation of LiCl-KCl-Li 3 N-CrCl 2 Mixed salt, by mole fraction, LiCl is 48.3mol%, KCl is 50.2mol%, Li 3 N is 0.5mol%, CrCl 2 is 1mol%. LiCl-KCl-Li 3 N-CrCl 2 The mixed salt was placed in a muffle furnace and dried at 200 °C for 48 h under the protection of argon.

[0034] (3) The dried LiCl-KCl-Li 3 N-CrCl 2 The mixed salt is placed in a high-temperature well-type furnace, and under the protection of argon, it is first heated to 450°C and kept at this temperature, so that the mixed salt is in a molten state and forms LiCl-KCl-Li3 N-CrCl 2 Molten salt, then the 304 stainles...

Embodiment 2

[0038] A preparation method of a proton exchange membrane fuel cell metal bipolar plate protective coating of the present invention comprises the following steps:

[0039] (1) Use argon arc welding to weld Fe-Cr wire with a diameter of 1 mm to the surface of the polished 316L stainless steel bipolar plate as the electrode lead, wash it with acetone and ethanol successively, and dry it for use.

[0040] (2) Preparation of LiCl-KCl-Li 3 N-CrCl 2 Mixed salt, by mole fraction, LiCl is 47.8mol%, KCl is 49.7mol%, Li 3 N is 1mol%, CrCl 2 is 1.5mol%. LiCl-KCl-Li 3 N-CrCl 2 The mixed salt was placed in a muffle furnace and dried at 200 °C for 48 h under the protection of argon.

[0041] (3) The dried LiCl-KCl-Li 3 N-CrCl 2 The mixed salt is placed in a high-temperature well-type furnace, and under the protection of argon, it is first heated to 550°C and kept at this temperature, so that the mixed salt is in a molten state and forms LiCl-KCl-Li 3 N-CrCl 2 Molten salt, then the...

Embodiment 3

[0045] A preparation method of a proton exchange membrane fuel cell metal bipolar plate protective coating of the present invention comprises the following steps:

[0046] (1) Use argon arc welding to weld Fe-Cr wire with a diameter of 1mm to the surface of the polished 309 stainless steel bipolar plate as the electrode lead. After cleaning with acetone and ethanol, dry it for use.

[0047] (2) Preparation of LiCl-KCl-Li 3 N-CrCl 2 Mixed salt, by mole fraction, LiCl is 48mol%, KCl is 50mol%, Li 3 N is 1mol%, CrCl 2 is 1mol%. LiCl-KCl-Li 3 N-CrCl 2 The mixed salt was placed in a muffle furnace and dried at 200 °C for 48 h under the protection of argon.

[0048] (3) The dried LiCl-KCl-Li 3 N-CrCl 2 The mixed salt is placed in a high-temperature well-type furnace, and under the protection of argon, it is first heated to 500°C and kept at this temperature, so that the mixed salt is in a molten state and forms LiCl-KCl-Li 3 N-CrCl 2 Molten salt, then the 309 stainless ste...

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Abstract

The invention discloses a method for preparing a protective coating for a metal bipolar plate of a proton exchange membrane fuel cell, which includes (1) welding Fe-Cr wire to the surface of the metal bipolar plate as an electrode lead; (2) preparing LiCl- KCl-Li3N-CrCl2 mixed salt drying; (3) Melt the mixed salt in a high-temperature well-type furnace, use the metal bipolar plate as the cathode, and Cr as the anode, and electrodeposit Cr coating on the surface of the metal bipolar plate; (4) The electro-deposited cathode and anode are converted to anode nitriding of the Cr coating on the metal bipolar plate, partly transformed into CrxN coating, x is 1 or 2, and a Cr / CrxN composite coating is obtained on the surface of the metal bipolar plate. The preparation method of the invention has simple process, is environmentally friendly, can effectively control the thickness of the protective coating and its microstructure, and the prepared protective coating has excellent corrosion resistance and is well combined with the bipolar plate substrate.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and in particular relates to a method for preparing a metal bipolar plate protective coating of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) not only has the characteristics of high efficiency, no pollution, no noise, and continuous operation of general fuel cells, but also has the advantages of high power density, low operating temperature, fast start-up, and long service life. It has broad application prospects in fixed power stations, electric vehicles, special power sources, mobile power sources, etc., and has attracted the attention of more and more countries and enterprises. [0003] Bipolar plates are one of the key materials in proton exchange membrane fuel cells. The graphite bipolar plate that has been commercialized at present has good corrosion resistance, electrical conductivity and thermal conductiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0228C25D3/66C25D11/00H01M8/0202
CPCC25D3/66C25D11/00H01M4/8657H01M4/8817H01M8/0269Y02E60/50
Inventor 任延杰陈荐陈亚庆陈建林何建军邱玮
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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