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Method for preparing surface modified stainless steel as biplar plate for proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, which is applied to fuel cell parts, battery electrodes, metal material coating processes, etc. The effect of corrosion resistance

Inactive Publication Date: 2008-01-16
DALIAN JIAOTONG UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, steel needs to be refined separately. On the other hand, such heat treatment is usually a sensitization treatment, and the formed carbides protrude from the metal surface, destroying the continuity of the passivation film on the stainless steel surface, and easily forming carbide grains. intergranular corrosion

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  • Method for preparing surface modified stainless steel as biplar plate for proton exchange membrane fuel cell
  • Method for preparing surface modified stainless steel as biplar plate for proton exchange membrane fuel cell
  • Method for preparing surface modified stainless steel as biplar plate for proton exchange membrane fuel cell

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Embodiment Construction

[0034] Degrease the 304 stainless steel with a thickness of 0.1~0.3mm with petroleum ether, and then use 0.5~1.0mol·L -1Wash it with dilute nitric acid for 15-20 minutes, apply a layer of saturated silver nitrate aqueous solution on the surface, dry it, put it into the muffle furnace and heat it to 780°C, keep it warm for 30 minutes, take it out, and wash it with dilute hydrochloric acid; The comparison test of the contact resistance was carried out under pressure. The results are shown in Figure 3. Compared with the stainless steel with only heat treatment and untreated stainless steel, the contact resistance between the stainless steel with the heat treatment and the silver salt coating process is significantly reduced. . Then passivate with potassium dichromate passivation solution for 20 minutes, the surface microstructure is shown in Figure 4a, and the comparative test results of corrosion resistance are shown in Figure 4b, after passivation, the contact resistance increa...

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Abstract

The method for preparing corrosion resistant proton exchange membrane fuel cell (PEMFC) includes following steps: using techniques of heat treatment and coating silver salts on surface forms electric and corrosion resistant granules of chromium carbide and silver as electric mesh on surface of stainless steel sheet; comparing with contact resistance of stainless steel not processed, the contact resistance of PEMFC is 1 / 13 of the former; comparing with contact resistance of stainless steel, which receives heat treatment only, the contact resistance of PEMFC is lowered obviously; using electrochemistry technique or chemical passivation passivates not conducting part in conducting mesh, protects sensitization area generated by heat treatment so as to raise corrosion resistance. Thus, surface of the stainless steel includes conducting and corrosion resistant network and corrosion resistant gaps. The invention solves conducting and corrosion resistant issues of bipolar plate.

Description

technical field [0001] The invention relates to fuel cell (FC) technology, in particular to a method for preparing a surface-modified stainless steel bipolar plate of a proton exchange membrane fuel cell (PEMFC). Background technique [0002] A fuel cell (FC) is an electrochemical power generation device that converts chemical energy stored in fuel and oxidant isothermally directly into electrical energy according to electrochemical principles. Due to its outstanding advantages in terms of high energy conversion efficiency, environmental friendliness, quietness, and high reliability, the research and development of fuel cell technology has attracted the attention of governments and large companies in various countries, and it is considered to be the first choice for clean and efficient power generation in the 21st century. technology. [0003] In addition to the general characteristics of fuel cells, proton exchange membrane fuel cells (PEMFC) also have outstanding features...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02C23C18/42H01M4/88H01M8/0206
CPCY02E60/50
Inventor 徐洪峰李映辉刘明
Owner DALIAN JIAOTONG UNIVERSITY
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