Stainless steel for fuel cell separator plate and manufacturing method therefor

A fuel cell and stainless steel technology, used in fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems of spending a lot of time, low pickling efficiency, etc., to improve productivity, low interface contact resistance, reduce The effect of manufacturing cost

Active Publication Date: 2018-04-17
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When pickling the passivation film using nitric acid solution according to such a manufacturing method, said method has a disadvantage in that it takes a lot of time for post-treatment processes due to low pickling efficiency

Method used

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  • Stainless steel for fuel cell separator plate and manufacturing method therefor
  • Stainless steel for fuel cell separator plate and manufacturing method therefor
  • Stainless steel for fuel cell separator plate and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Under the conditions of Example 1 of the present invention listed in the following table 1, in a sulfuric acid solution, a cold-rolled sheet with a thickness of 0.1 mm (using a cold rolling mill (i.e. a Z-rolling mill) to contain 30% by weight (weight %) Cr After cold rolling, the ferritic-based stainless steel was subjected to a bright annealing heat treatment in a reducing atmosphere containing hydrogen (75% by volume) and nitrogen (25% by volume) to undergo first and second film denaturations, and then subjected to the second A three-membrane denaturation process in which the board is immersed in a mixed acid solution containing nitric and hydrofluoric acids. Thereafter, the physical properties of the cold-rolled sheets were evaluated.

Embodiment 2

[0121] A cold-rolled sheet having a thickness of 0.1 mm was produced under the same conditions as in Example 1, except that the cold-rolled sheet was made in a sulfuric acid solution under the conditions of Example 2 of the present invention listed in Table 1 below. Subjected to first and second membrane denaturations and then to a third membrane denaturation process in which the plates were immersed in a mixed acid solution comprising nitric acid and hydrofluoric acid. Thereafter, the physical properties of the cold-rolled sheets were evaluated.

Embodiment 3

[0123] A cold-rolled sheet having a thickness of 0.1 mm was produced under the same conditions as in Example 1, except that the cold-rolled sheet was made in a sulfuric acid solution under the conditions of Example 3 of the present invention listed in Table 1 below. Subjected to first and second membrane denaturations and then to a third membrane denaturation process in which the panels are immersed in a mixed acid solution comprising nitric and hydrofluoric acids. Thereafter, the physical properties of the cold-rolled sheets were evaluated.

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Abstract

Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr / Fe atomic weight ratio in a 1 nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless base material and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costsare reduced and productivity can be improved.

Description

technical field [0001] Embodiments of the present disclosure relate to stainless steel for fuel cell separators and methods of manufacturing the same, and more particularly to the ability to secure excellent Stainless steels for fuel cell separators with high contact resistance and high corrosion potential and methods for their manufacture. Background technique [0002] A solid polymer fuel cell is a fuel cell in which a polymer membrane having hydrogen ion exchange characteristics is used as an electrolyte, and thus has a low operating temperature of about 80° C. and high efficiency compared with other types of fuel cells. In addition, solid polymer fuel cells can be used in vehicles and in homes because they operate quickly and have high power density and a simple battery main body structure. [0003] Such a solid polymer fuel cell is composed of main components such as a polymer electrolyte membrane, electrodes and separators constituting a stack. In a solid polymer fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M8/1018C22C38/50C22C38/48C22C38/44
CPCC22C38/44C22C38/48C22C38/50H01M8/1018H01M8/021H01M8/0219H01M8/0228C25F3/06C25F5/00C22C38/001C22C38/02C22C38/04C23G1/086C23F1/28C22C38/18C22C38/20C22C38/22C22C38/26C22C38/28C22C38/42Y02E60/10Y02P70/50Y02E60/50H01M8/1004
Inventor 金光珉金锺熙曹基勋徐辅晟
Owner 浦项股份有限公司
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