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A surface modified 20Cr steel bipolar plate material and a preparation method thereof

A surface modification and bipolar plate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of affecting conductivity, increasing contact resistance, reducing the working efficiency of fuel cell stacks, etc., and achieve the effect of reducing production costs

Inactive Publication Date: 2018-12-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the fuel cell environment, the surface of low carbon steel will corrode to form a passivation film, which will increase the contact resistance between the bipolar plate and the gas diffusion film, affect the conductivity, and reduce the working efficiency of the fuel cell stack.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (1) take 20Cr steel as the substrate, first carry out the pretreatment of grinding and polishing (No. 180 sandpaper grinding), and then adopt the gas nitriding process to carry out nitriding treatment to the polished 20Cr steel substrate (using well type gas nitriding furnace, put the 20Cr steel substrate into the furnace, do sealing treatment, heat to 550°C and continuously feed ammonia gas for 6h);

[0023] (2) Adopt the electroless nickel plating process (nickel plating process: carry out water bath heating with constant temperature water bath pot, apply plating temperature and keep on 85 ℃, pH=5.6~5.8, apply plating time 2h, apply agitator to stir with the process of plating, rotating speed is 200r / min. After the plating is completed, take out the sample, wash it with deionized water, and dry it with a hair dryer for later use.) A nickel-phosphorus layer with a thickness of 20-30 μm is plated on the surface of the 20Cr steel substrate after nitriding: t...

Embodiment 2

[0028] (1) Using 20Cr steel as the substrate, firstly perform grinding and polishing pretreatment (No. 5 sandpaper grinding), and then use gas nitriding process to carry out nitriding treatment on the polished 20Cr steel substrate (using well type gas nitriding furnace, 20Cr Put the steel substrate into the furnace, seal it, heat it to 550°C and continuously feed ammonia gas for 6 hours);

[0029] (2) Adopt the electroless nickel plating process (nickel plating process: carry out water bath heating with constant temperature water bath pot, apply plating temperature and keep on 85 ℃, pH=5.6~5.8, apply plating time 2h, apply agitator to stir with the process of plating, rotating speed is 200r / min. After the plating is completed, take out the sample, wash it with deionized water, and dry it with a hair dryer for later use.) A nickel-phosphorus layer with a thickness of 20-30 μm is plated on the surface of the 20Cr steel substrate after nitriding: the composition of the electroless...

Embodiment 3

[0033] (1) With 20Cr steel as the substrate, the pre-grinding and polishing treatment (No. 180 sandpaper grinding) is first carried out, and then the polished 20Cr steel substrate is nitrided by the gas nitriding process (the well-type gas nitriding furnace is used, and the 20Cr Put the steel substrate into the furnace, seal it, heat it to 330°C and continuously feed ammonia gas for 6 hours);

[0034] (2) Adopt the electroless nickel plating process (nickel plating process: carry out water bath heating with constant temperature water bath pot, apply plating temperature and keep on 85 ℃, pH=5.6~5.8, apply plating time 2h, apply agitator to stir with the process of plating, rotating speed is 200r / min. After the plating is completed, take out the sample, wash it with deionized water, and dry it with a hair dryer for later use.) A nickel-phosphorus layer with a thickness of 20-30 μm is plated on the surface of the 20Cr steel substrate after nitriding: the composition of the electro...

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Abstract

The invention relates to a surface modified 20Cr steel bipolar plate material and a preparation method thereof. 20Cr steel is taken as a substrate, that substrate is ground and polis before being treat, and then the substrate is subjected to ion nitriding, electroless nickel plating, nitride coat deposited by PVD technology and the like to prepare a composite multilayer film of 20Cr steel / nitriding / nickel plating / CrN or CrMoN. Under the simulated PEMFC environment, the corrosion resistance and surface contact resistance of the surface modified 20Cr steel bipolar plate meet the American DOE 2020 standard, and the adhesion between the film and the substrate is greater than 45N. The corrosion resistance and surface contact resistance of the surface modified 20Cr steel bipolar plate meet the American DOE 2020 standard. 316L stainless steel material can be replace by a common carbon steel sheet by adopting that method of the invention, and the production cost of the bipolar plate is reduce.

Description

(1) Technical field [0001] The invention relates to a surface-modified 20Cr steel bipolar plate material and a preparation method thereof. (2) Background technology [0002] In today's world, energy issues and environmental issues have become common problems faced by the whole world. The fossil energy on the earth is limited, and the harmful gases emitted by the combustion of fossil energy will not only cause the greenhouse effect, but also cause air pollution, acid rain, and the hole in the ozone layer, etc. environmental issue. Therefore, it is imminent to find a new sustainable renewable clean energy to replace the traditional fossil energy. [0003] A fuel cell is a new energy device that directly converts chemical energy into electrical energy. It has the characteristics of not being affected by the Carnot cycle, high energy conversion rate, and low pollution. Therefore, it is considered by many researchers to be the preferred clean and efficient energy technology in...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8657H01M4/8803H01M2004/8694Y02E60/50
Inventor 金杰刘豪杰郑大才
Owner ZHEJIANG UNIV OF TECH
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