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AssigneeYoshida Kogyo K.K.
InventorsMutsuo Hasegawa, Hatsuo Hirono, Katsuyuki Nagata, Shinji Hayashi, Hiroshi Yamagata
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The corrosion resistance of an anodically oxidized surface film on aluminum articles is improved by sealing micropores and the like in such surface film with an aqueous sealing solution or dispersion containing siliceous material, such as silicic acid or a silicate, therein and thereafter overcoating the so-sealed surface with a select coating composition. The aqueous sealing solution is brought into contact with the aluminum article, such as by dipping the article into the solution and drying the so-coated article. Optionally, an electrical voltage may be applied through the sealing liquid and through the aluminum article during the sealing process. Further, in certain embodiments an electrical voltage may be applied through the sealing liquid before the liquid contacts the aluminum article. If desired, the surface of the aluminum article may be colored prior to sealing.
A method of providing a coating film onto an oxide film on a surface of an anodically oxidized aluminum article, comprising, in combination, the seqential steps of:
Dependencies are inferred from the claim text.