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. 09, 2013
Filed:
Aug. 20, 2009
Hiroki Uchida, Hirakata, JP;
Kazuki Yoshikawa, Hirakata, JP;
Toshiaki Shibata, Hirakata, JP;
C. Uyemura & Co., Ltd., Osaka, JP;
Abstract
A workpiece including aluminum or an aluminum alloy on a surface thereof is subjected to surface treatment including the steps of immersing in an acidic or alkaline aluminum oxide film-removing solution containing a salt or oxide of a metal capable of substitution with aluminum and forming a substituted metal layer and contained in the removing solution on a surface of the aluminum or aluminum alloy while removing an aluminum oxide film on aluminum or aluminum alloy surface, forming a substituted zinc film by zinc substitution treatment without removing the substituted metal layer, removing the substituted metal layer and substituted zinc film with an oxidizing liquid, and subjecting again to zinc substitution treatment, forming a substituted zinc film.