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Method for producing stainless steel plate for fuel cell separator

A technology of stainless steel plates and fuel cells, which is applied to fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., can solve the problems of increased contact resistance, reduced power generation efficiency, and large contact resistance, achieving low contact resistance, Low safety, practical and beneficial effect

Pending Publication Date: 2020-06-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in the technique disclosed in Patent Document 1, the formation of a passivation film causes an increase in contact resistance, resulting in a decrease in power generation efficiency.
Thus, the metal raw material disclosed in Patent Document 1 has problems such as a larger contact resistance than graphite raw materials.

Method used

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  • Method for producing stainless steel plate for fuel cell separator
  • Method for producing stainless steel plate for fuel cell separator
  • Method for producing stainless steel plate for fuel cell separator

Examples

Experimental program
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Effect test

Embodiment 1

[0170] A stainless steel plate (bright annealed plate) having a plate thickness of 0.10 mm (bright annealed plate) having the composition described in Table 1 (the balance being Fe and unavoidable impurities) was prepared, and cathodic electrolysis was performed on the stainless steel plate under the conditions shown in Table 2. treatment to remove the oxide film formed on the surface of the steel sheet. Next, under the conditions shown in Table 2, electrolytic etching treatment was performed by potential control, and then, under the conditions shown in Table 2, dipping treatment was performed as a surface stabilization treatment to obtain a stainless steel plate for separators. It should be noted that the potentials in Table 2 are all relative to the potential of the reference electrode (Vvs. Ag / AgCl).

[0171] Here, when electrolytic etching is performed by potential control, Ag / AgCl is used as a reference electrode in advance, and each steel The anodic polarization curve w...

Embodiment 2

[0187] Prepare a stainless steel plate (bright annealed plate) with a plate thickness of 0.10 mm (bright annealed plate) having the component composition (the balance is Fe and unavoidable impurities) recorded in Table 1, and the stainless steel plate is subjected to the conditions shown in Table 3 and Table 4. Cathodic electrolytic treatment is performed to remove the oxide film formed on the surface of the steel sheet. Next, under the conditions shown in Table 3 and Table 4, an electrolytic etching treatment was carried out by current control, and then, under the conditions shown in Table 3 and Table 4, dipping treatment or electrolytic treatment was performed as a surface stabilization treatment to obtain Stainless steel plates for separators (It should be noted that the current densities in Tables 3 and 4 are values ​​obtained by dividing the current flowing between the stainless steel plate to be processed and the counter electrode by the surface area of ​​the processed ma...

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Abstract

This method comprises: preparing a stainless steel plate as a material; removing an oxide film on the surface of the stainless steel plate; and electrolytically etching the stainless steel plate in anactive region of the stainless steel plate.

Description

technical field [0001] The present invention relates to a method for manufacturing a stainless steel plate for a fuel cell separator. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, the development of fuel cells that are excellent in power generation efficiency and do not emit carbon dioxide has been progressing. The fuel cell generates electricity through the electrochemical reaction of hydrogen and oxygen. Its basic structure has a sandwich structure, consisting of an electrolyte membrane (ion exchange membrane), two electrodes (fuel electrode and air electrode), O 2 (air) and H 2 The diffusion layer and two separators (Bipolar plate (bipolar plate)) constitute. [0003] And, according to the type of electrolyte membrane used, it is classified into phosphoric acid fuel cell, molten carbonate fuel cell, solid oxide fuel cell, alkaline fuel cell and solid polymer fuel cell (PEFC; proton- exchange membrane fuel cell (...

Claims

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Application Information

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IPC IPC(8): H01M8/021C22C38/00C22C38/18C22C38/58C23C22/50C25F1/06C25F3/06H01M8/10
CPCH01M8/021C25F3/06Y02P70/50Y02E60/50C22C38/004C22C38/02C22C38/42C22C38/44C22C38/48C22C38/50H01M2008/1095C25F1/06C23C22/50C25D11/34
Inventor 矢野孝宜石川伸
Owner JFE STEEL CORP
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