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. 09, 2012
Filed:
Dec. 28, 2007
Tadahiro Ohmi, Miyagi, JP;
Minoru Tahara, Miyagi, JP;
Yasuhiro Kawase, Fukuoka, JP;
National University Corporation Tohoku University, Sendai-shi, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
In a method of manufacturing a metal member, a metal material containing aluminum as a main component is anodized in an anodization solution having a pH of 4 to 10 and containing a nonaqueous solvent having a dielectric constant smaller than that of water and capable of dissolving water, thereby forming a nonporous amorphous aluminum oxide passivation film on a surface of the metal member. The method includes a step of controlling the viscosity of the anodization solution. In the step of controlling the viscosity, the viscosity of the anodization solution is lowered by elevating the temperature of the anodization solution above the room temperature or by adding to the anodization solution a substance having a dielectric constant smaller than that of water and a viscosity lower than that of the nonaqueous solvent.