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.:
Date of Patent:
Sep. 09, 2014
Filed:
Jul. 27, 2007
Applicants:
Yoo Taek Jeon, Gyeonggi-do, KR;
Yeon Soo Jeong, Gyeonggi-do, KR;
Inventors:
Yoo Taek Jeon, Gyeonggi-do, KR;
Yeon Soo Jeong, Gyeonggi-do, KR;
Assignee:
Hyundai Hysco, Ulsan, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F 1/00 (2006.01); C23G 1/08 (2006.01); C23F 1/28 (2006.01); C22C 38/00 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C25D 11/34 (2006.01); H01M 8/02 (2006.01);
U.S. Cl.
CPC ...
C23G 1/085 (2013.01); C23F 1/28 (2013.01); C22C 38/008 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C23G 1/088 (2013.01); C25D 11/34 (2013.01); H01M 8/021 (2013.01); H01M 8/0219 (2013.01); H01M 8/0228 (2013.01); Y02E 60/50 (2013.01);
Abstract
A method for surface treatment of a stainless steel separator for a fuel cell comprises preparing a stainless steel sheet containing nickel, chrome and iron, and having a passive film on a surface of the stainless steel sheet, and dipping the stainless steel sheet into a mixed etching solution of nitric acid (HNO3) and sulfuric acid (H2SO4) at a temperature of 50-70° C. for 30 seconds to 30 minutes to selectively lower an amount of Fe in the passive film formed on the surface of the stainless steel sheet.