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Bipolar plate material with TiNxOy coating deposited on surface of stainless steel and preparation method and application of bipolar plate material

A technology of surface deposition and bipolar plates, applied in coatings, metal material coating processes, fuel cells, etc., can solve problems such as difficult application and unsuitable high corrosion current density, and achieve less crystal defects and high density , Stainless steel surface beautiful effect

Pending Publication Date: 2020-12-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although transition metal nitride coated stainless steel has good corrosion resistance, its high corrosion current density is at 10 -6 ~10 -5 A / cm 2 It is still not applicable within the scope, and it is difficult to apply it in practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A surface-modified 304 stainless steel bipolar plate material, the preparation process of which is as follows: the 304 stainless steel bar with a diameter of 30 mm is cut into a sample with a diameter of 30 mm and a thickness of 3 mm by wire cutting, and a 400#, 1000 #, 1500#, 2000# SiC sandpapers were used to grind the sample in turn until the scratches on the surface were consistent, and then the surface was polished to a mirror surface with W0.5 diamond abrasive paste, and then the mixed solution of alcohol and acetone (volume ratio 1:1) Ultrasonic cleaning in medium for 10 minutes, and then ultrasonic cleaning in alkaline washing solution for 10 minutes to remove surface oil and improve the success rate of coating. The ultrasonic frequency is 100Hz and it is carried out at room temperature. After ultrasonic cleaning, rinse the surface with deionized water and dry in a dust-free environment (preferably in an oven at a temperature of 40-50° C.) to obtain a pretreated s...

Embodiment 2

[0020]A surface-modified 304 stainless steel bipolar plate material, the preparation process of which is as follows: the 304 stainless steel bar with a diameter of 30 mm is cut into a sample with a diameter of 30 mm and a thickness of 3 mm by wire cutting, and a 400#, 1000 #, 1500#, 2000# SiC sandpapers were used to grind the sample in turn until the scratches on the surface were consistent, and then the surface was polished to a mirror surface with W0.5 diamond abrasive paste, and then the mixed solution of alcohol and acetone (volume ratio 1:1) Ultrasonic cleaning in medium for 10 minutes, and then ultrasonic cleaning in alkaline washing solution for 10 minutes to remove surface oil and improve the success rate of coating. The ultrasonic frequency is 100Hz and it is carried out at room temperature. After ultrasonic cleaning, rinse the surface with deionized water and dry in a dust-free environment (preferably in an oven at a temperature of 40-50° C.) to obtain a pretreated st...

Embodiment 3

[0023] In this example, the Ti target current was kept at 8A, and a layer of TiNxOy coating was deposited on the surface of the Ti transition layer for 140min to obtain a TiNxOy film.

[0024] Other schemes of this embodiment are the same as in Embodiment 2.

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Abstract

The invention relates to a bipolar plate material with a TiNxOy coating deposited on the surface of stainless steel and a preparation method and application of the bipolar plate material. A preparation method of the surface-modified 304 stainless steel bipolar plate material comprises the following steps of by taking 304 stainless steel as a matrix, depositing a TiNxOy coating on the surface of the matrix by using a closed field non-equilibrium magnetron sputtering ion plating technology to obtain a thin-film stainless steel bipolar plate with high corrosion resistance. The surface-modified 304 stainless steel bipolar plate material is applied to a proton exchange membrane fuel cell bipolar plate. The coating is low in production cost and shorter in production period than a C coating, thesurface of the coating has ultra-high hardness and ultra-high elasticity modulus, meanwhile, the coating has better corrosion resistance and good conductivity than metal nitride, and the application standard of American DOE 2025 of proton exchange membrane fuel cell bipolar plates can be met.

Description

technical field [0001] The invention relates to a surface-modified 304 stainless steel bipolar plate and its preparation method and application, that is, TiN is deposited on the surface of 304 stainless steel by closed-field unbalanced magnetron sputtering ion plating technology x o y / 304 high corrosion resistance coating, this coating not only has low production cost, super high corrosion resistance and good electrical conductivity, it can meet the application standard of proton exchange membrane fuel cell bipolar plate. Background technique [0002] Proton exchange membrane fuel cell is a new type of clean energy device that directly converts chemical energy into electrical energy. It is not affected by the Carnot cycle, has high energy conversion rate, and has the characteristics of low pollution. The bipolar plate is the most important component in the proton exchange membrane fuel cell, which not only accounts for 80% of the weight and almost the entire volume of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/08C23C14/16C23C14/02H01M8/021H01M8/0228
CPCC23C14/0036C23C14/3464C23C14/08C23C14/025C23C14/35C23C14/165C23C14/021H01M8/0228H01M8/021Y02E60/50Y02P70/50
Inventor 金杰忽梦磊杜怡悦赵晓华
Owner ZHEJIANG UNIV OF TECH
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