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Method for modifying surface of aluminum alloy bipolar plate by using polyacrylonitrile film

A polyacrylonitrile and aluminum alloy technology, applied in the direction of surface reaction electrolytic coating, anodic oxidation, fuel cell parts, etc., can solve the problems of harsh preparation conditions and complicated process, and achieve simple, easy-to-control, excellent preparation process The effect of corrosion resistance

Active Publication Date: 2019-05-28
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complicated, and the preparation conditions are extremely harsh, and it needs to be carried out under vacuum conditions.

Method used

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  • Method for modifying surface of aluminum alloy bipolar plate by using polyacrylonitrile film
  • Method for modifying surface of aluminum alloy bipolar plate by using polyacrylonitrile film
  • Method for modifying surface of aluminum alloy bipolar plate by using polyacrylonitrile film

Examples

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Effect test

Embodiment 1

[0043] A preparation method for modifying the surface of an aluminum alloy bipolar plate with polyacrylonitrile, comprising the steps of:

[0044] (1) Pretreatment of aluminum alloy

[0045]Three pieces of 50mm×10mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, 2000# water-grinding sandpaper in sequence, and then polished with W3.5 metallographic sandpaper. Put the aluminum alloy in acetone, use an ultrasonic cleaner to ultrasonically clean it for about 15 minutes, and then rinse it with absolute ethanol and deionized water in order to remove surface oil and grease;

[0046] (2) Preparation of polyacrylonitrile solution

[0047] Weigh 0.5g of polyacrylonitrile (molecular weight: 150,000) and dissolve it in 20ml of DMF, put it in a constant temperature water bath at 60°C and stir for 12h;

[0048] (3) Electrochemical polishing

[0049] The aluminum alloy is electrochemically polished with a perchloric acid alcohol solution by means of a potentiostat. The alu...

Embodiment 2

[0061] A preparation method for modifying the surface of an aluminum alloy bipolar plate with polyacrylonitrile, comprising the steps of:

[0062] (1) Pretreatment of aluminum alloy

[0063] Three pieces of 50mm×10mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, 2000# water-grinding sandpaper in sequence, and then polished with W3.5 metallographic sandpaper. Put the aluminum alloy in acetone, use an ultrasonic cleaner to ultrasonically clean it for about 15 minutes, and then rinse it with absolute ethanol and deionized water in order to remove surface oil and grease;

[0064] (2) Preparation of polyacrylonitrile solution

[0065] Weigh 0.1g of polyacrylonitrile (molecular weight: 150,000) and dissolve it in 20ml of DMF, put it in a constant temperature water bath at 60°C and stir for 12h;

[0066] (3) Electrochemical polishing

[0067] The aluminum alloy is electrochemically polished with a perchloric acid alcohol solution by means of a potentiostat. The al...

Embodiment 3

[0074] A preparation method for modifying the surface of an aluminum alloy bipolar plate with polyacrylonitrile, comprising the steps of:

[0075] (1) Pretreatment of aluminum alloy

[0076] Three pieces of 50mm×10mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, 2000# water-grinding sandpaper in sequence, and then polished with W3.5 metallographic sandpaper. Put the aluminum alloy in acetone, use an ultrasonic cleaner to ultrasonically clean it for about 15 minutes, and then rinse it with absolute ethanol and deionized water in order to remove surface oil and grease;

[0077] (2) Preparation of polyacrylonitrile solution

[0078] Weigh 0.25g of polyacrylonitrile (molecular weight: 150,000) and dissolve it in 20ml of DMF, put it in a constant temperature water bath at 60°C and stir for 12h;

[0079] (3) Electrochemical polishing

[0080] The aluminum alloy is electrochemically polished with a perchloric acid alcohol solution by means of a potentiostat. The a...

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Abstract

The invention provides a method for modifying the surface of an aluminum alloy bipolar plate by using polyacrylonitrile film. The method is characterized by comprising the following steps that S1, aluminum alloy grinding and ultrasonic cleaning ; S2, performing electrochemical polishing and anodic oxidation treatment on the aluminum alloy by virtue of a constant potential instrument by using a perchloric acid alcohol solution and a phosphoric acid solution respectively; and S3, the polyacrylonitrile solution is dripped on the surface of the aluminum alloy, and then heat treatment is carried out to obtain the aluminum alloy bipolar plate modified by the polyacrylonitrile film on the surface. According to the method, the corrosion resistance of the aluminum alloy strong acid solution is greatly improved; and in addition, the method is low in cost and simple in preparation method.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, and mainly relates to a preparation method for modifying the surface of an aluminum alloy bipolar plate with a polyacrylonitrile film. Background technique [0002] The rapid consumption of fossil fuels in recent years may not be able to meet future energy demand, and will also bring climate changes such as acid rain and global warming. Many countries and companies are currently investing heavily in extensive research and development programs to develop new alternative and renewable energy sources and technologies that can bridge the current and future energy supply and demand gap in a sustainable manner. New energy sources include solar energy, wind energy, hydroelectric power, biomass energy, geothermal energy, nuclear energy, and hydrogen energy, among others. Fuel cells as hydrogen energy, the most promising green and clean alternative energy and energy conversion...

Claims

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Application Information

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IPC IPC(8): C25F3/20C25D11/08C25D11/18C22F1/04C21D9/00H01M8/0208H01M8/0221H01M8/0228
CPCY02E60/50
Inventor 徐群杰曾彦玮秦真兰贺子豪华千慧闵宇霖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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