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:
Apr. 20, 1993
Filed:
Feb. 19, 1991
Yukimitsu Shiohara, Tokyo, JP;
Masaki Abe, Tokyo, JP;
NKK Corporation, Tokyo, JP;
Abstract
A method for manufacturing an electrogalvanized steel sheet excellent in spot weldability, which comprises the steps of: adding, into an acidic electrogalvanizing solution containing an oxidizer, a complexing agent, which is capable of forming a stable complex with zinc, in an amount within a range of from 0.001 to 10 moles per liter of the electrogalvanizing solution, or a pH buffer, which has a pH buffering effect in a solution having a pH value within a range of from 5 to 12, in an amount within a range of from 1 to 50 g per liter of the electrogalvanizing solution; and electrogalvanizing a steel sheet in the resultant acidic electrogalvanizing solution containing the complexing agent or the pH buffer in addition to the oxidizer, to form a galvanizing layer comprising zinc oxide or zinc hydroxide on the surface of the steel sheet.