| 摘要 |
<p>A method of treating a surface of aluminum to form a pattern thereon is disclosed, which comprises electrolyzing the aluminum, after anodic oxidation in usual manner, in a bath containing at least one substance selected from organic acids having OH or COOH group, orthophosphoric acid, pyrophosphoric acid, chromic acid, phosphorous acid, sulfuric amide, highly concentrated sulfuric acid and salts thereof, subjecting to a hot-water rinsing treatment, adhering at its dried surface a substance contributing to the formation of the pattern at a subsequent electrolytic pigmentation and then subjecting to an electrolytic pigmentation, whereby a colored pattern based on a difference of color tone between adhered portion and nonadhered portion is formed on the aluminum surface.</p> |
