| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to sufficiently reduce the friction resistance of the anodically oxidized film of an Si-base aluminum alloy. SOLUTION: An anodic oxidation treatment method for a piston made of the aluminum alloy consists of a process for forming the anodically oxidized film 16 on the aluminum alloy 10 containing Si 12, 13, 14 with an electrolyte mixed with phosphate and fluoride, a process for impregnating the micropores 18 of the anodically oxidized film 16 with a photosetting resin and a process for curing the photosetting resin by casting light thereto.
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