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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 11398631 B1

PDFFull Text
Date of Patent:
Jul. 26, 2022

Filed:

Dec. 16, 2016

Stainless steel for separation plate of polymer electrolyte membrane fuel cell having improved hydrophilic property and corrosion resistance, and manufacturing method therefor

Applicant:

Posco, Pohang-si, KR;

Inventors:

Jong Hee Kim, Daejeon, KR;

Kwang Min Kim, Pohang-si, KR;

Ki Hoon Jo, Pohang-si, KR;

Bo Sung Seo, Pohang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

Morgan, Lewis & Bockius LLP

Primary Examiner:

Osei K Amponsah

Int. Cl.
CPC ...
H01M 8/021 (2016.01); H01M 8/0228 (2016.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C23C 22/50 (2006.01); C23C 22/73 (2006.01); C23F 17/00 (2006.01); C25F 1/06 (2006.01); C25F 3/06 (2006.01); H01M 8/10 (2016.01);
U.S. Cl.
CPC ...
H01M 8/021 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C23C 22/50 (2013.01); C23C 22/73 (2013.01); C23F 17/00 (2013.01); C25F 1/06 (2013.01); C25F 3/06 (2013.01); H01M 8/0228 (2013.01); H01M 2008/1095 (2013.01);
Abstract

Provided are stainless steel for a separator of a polymer electrolyte membrane fuel cell, which exhibits enhanced hydrophilicity and enhanced corrosion resistance, and a method of manufacturing the same. In the stainless steel for a separator of a polymer electrolyte membrane fuel cell, which exhibits enhanced hydrophilicity and enhanced corrosion resistance, according to an embodiment of the present invention, a ratio of Cr hydroxide/Cr oxide included in a passivation film of the stainless steel ranges from 0.5 to 1.7, and the passivation film has a contact angle (θ) of 70° or less. Thus, not only corrosion resistance may be enhanced by removing a non-conductive film formed on a surface of the stainless steel and forming a new conductive film thereon, but hydrophilicity may also be secured without additional surface treatment such as a separate coating or the like, and thus manufacturing costs may be reduced and productivity may be increased.

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