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:
Sep. 15, 2009
Filed:
Dec. 13, 2007
Yasuhiko Endo, Yokohama, JP;
Kengo Takase, Kasugai, JP;
Shunjiro Watanabe, Aichi, JP;
Shoichiro Adachi, Ogaki, JP;
Yasuhiko Endo, Yokohama, JP;
Kengo Takase, Kasugai, JP;
Shunjiro Watanabe, Aichi, JP;
Shoichiro Adachi, Ogaki, JP;
Hoden Seimitsu Kako Kenkyusho Co., Ltd., Atsugi, JP;
Abstract
Provided is a chromium-free surface treatment method which imparts practical rust inhibitive performance to a metal product having a zinc surface to which it was difficult to impart rust inhibitive performance of practical level. A conversion-coated film of zinc phosphate etc. is formed on the zinc surface of the metal product as pretreatment, and the silica-based film is formed by applying a chromium-free surface treatment agent which uses alcohol or mixture of water and alcohol as a solvent to the conversion-coated film. As a result, when an aqueous surface treatment agent containing alcohol is applied, it is possible to suppress the formation of white rusting for 72 hours or longer in the salt spray test.