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:
Aug. 27, 2019
Filed:
Feb. 27, 2015
Jfe Steel Corporation, Tokyo, JP;
Katsuya Hoshino, Columbus, OH (US);
Shoichiro Taira, Tokyo, JP;
Masayasu Nagoshi, Kawasaki, JP;
Kazutoshi Hanada, Chiba, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A method for producing a galvanized steel sheet includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains P ions at a P concentration of 0.01 g/L or more and carbonate ions at a carbonate ion concentration of 0.1 g/L or more.