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:
Oct. 19, 1976
Filed:
Dec. 31, 1975
Applicant:
Inventors:
Hiroshi Takano, Fukuyama, JA;
Yoshitaka Kashiyama, Fukuyama, JA;
Assignee:
Nippon Kokan Kabushiki Kaisha, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ;
U.S. Cl.
CPC ...
204 28 ; 204 / ;
Abstract
In a conventional electrolytic chromating bath, a steel sheet is subjected to a cathodic electrolytic chromate treatment at a relatively high speed of 400 to 1,000m per minute, to form simultaneously a lower layer of metallic chromium and an upper layer of hydrated chromium oxides on the surface of said steel sheet; and then, said electrolytically chromated steel sheet is subjected to an anodic electrolytic treatment under the following conditions in said electrolytic chromating bath, to adjust the amount of said hydrated chromium oxide layer within the range from 0.1 to 0.3mg/dm.sup.2 :