| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum material having such a thick anodic oxide-film as to be endurable to the use in a hostile corrosive environment, and to provide a method for forming such a thick anodic oxide-film on the aluminum material in a short period of time. SOLUTION: In a process of forming the anodic oxide film on the aluminum material by electrolyzing the aluminum material in an acidic solution, the method for obtaining the aluminum material having the anodic oxide film with a film thickness of 150μm or more formed on the surface includes using a direct current superimposed with an alternating current, and electrolyzing the aluminum material while controlling the current density with time. COPYRIGHT: (C)2007,JPO&INPIT
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