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:
Mar. 12, 2024
Filed:
Feb. 18, 2020
Jfe Steel Corporation, Tokyo, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A method of producing a surface-treated steel sheet, comprising: subjecting a steel sheet having a Sn coating or plating layer to an anodic electrolytic treatment in an alkaline aqueous solution to form a Sn oxide layer; and then subjecting the steel sheet to a cathodic electrolytic treatment in an aqueous solution containing zirconium ions to form a layer containing zirconium oxide, wherein the Sn coating or plating layer has a Sn coating weight ofg/mtog/m, the Sn oxide layer has, at a point in time when the Sn oxide layer is formed, a reduction current peak within a potential range of −mV to −mV and an electric quantity of a reduction current in the potential range ofmC/cmtomC/cm, and the layer containing zirconium oxide has a Zr coating weight ofmg/mtomg/m.