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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11923580 B1

PDFFull Text
Date of Patent:
Mar. 05, 2024

Filed:

Jul. 29, 2016

Stainless steel for fuel cell separator plate and manufacturing method therefor

Applicant:

Posco, Pohang-si, KR;

Inventors:

Kwang Min Kim, Pohang-si, KR;

Jong Hee Kim, Daejeon, KR;

Ki Hoon Jo, Pohang-si, KR;

Bo Sung Seo, Pohang-si, KR;

Assignee:

POSCO CO., LTD, Gyeongsangbuk-Do Pohang-si, KR;

Attorney:

Morgan, Lewis & Bockius LLP

Primary Examiner:

Nathanael T Zemui

Int. Cl.
CPC ...
H01M 8/1018 (2016.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C23F 1/28 (2006.01); C23G 1/08 (2006.01); C25F 3/06 (2006.01); C25F 5/00 (2006.01); H01M 8/021 (2016.01); H01M 8/0217 (2016.01); H01M 8/0228 (2016.01); H01M 8/1004 (2016.01);
U.S. Cl.
CPC ...
H01M 8/1018 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C23F 1/28 (2013.01); C23G 1/086 (2013.01); C25F 3/06 (2013.01); C25F 5/00 (2013.01); H01M 8/021 (2013.01); H01M 8/0219 (2013.01); H01M 8/0228 (2013.01); H01M 8/1004 (2013.01); Y02P 70/50 (2015.11);
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 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 costs are reduced and productivity can be improved.

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