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:
Nov. 13, 1990
Filed:
May. 03, 1988
Kawasaki Steel Corporation, Kobe, JP;
Abstract
An exterior stainless steel sheet is provided comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Al, Al alloy, Zn or Zn alloy to a thickness of 0.1 to 70 .mu.m, preferably 1 to 70 .mu.m. A Zn or Zn-Ni alloy plated stainless steel strip is prepared by degreasing a stainless steel strip, substantially activating the surface of the strip, and electroplating the strip by immersing the strip in a hydrochloric acid solution having a concentration of 0.5 to 40 wt % in a zinc or zinc-nickel alloy plating bath at pH 3.5 or lower. Alternatively, activation may be carried out by cathodic electrolytic treatment in a hydrochloric acid solution having a concentration of 0.5 to 40 wt % at a current density of 0.1 to 100 A/dm. During electroplating of one side, the other side of the strip not to be plated is covered with a protective film. A stainless steel sheet comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Zn or Zn alloy to a thickness of 0.1 to 50 .mu.m, preferably 1 to 50 .mu.m is useful in preparing welded pipes.