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:
May. 16, 2017
Filed:
Jan. 19, 2011
Shinsuke Ide, Tokyo, JP;
Tomohiro Ishii, Tokyo, JP;
Shin Ishikawa, Tokyo, JP;
Yasushi Kato, Tokyo, JP;
Shinsuke Ide, Tokyo, JP;
Tomohiro Ishii, Tokyo, JP;
Shin Ishikawa, Tokyo, JP;
Yasushi Kato, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
A stainless steel for use in a fuel cell separator is produced by subjecting stainless steel containing 16 mass % or more of Cr to electrolytic treatment and thereafter to immersion treatment in a solution containing fluorine. The electrolytic treatment is carried out by anodic electrolyzation or by a combination of anodic electrolyzation and cathodic electrolyzation, and an anodic electrolytic quantity Qa and a cathodic electrolytic quantity Qc preferably satisfy Qa≧Qc. The solution containing fluorine preferably has a temperature of 40° C. or higher, and hydrofluoric acid concentration [HF] (mass %) and nitric acid concentration [HNO] (mass %) satisfying [HF]≧0.8×[HNO].