| 摘要 |
PCT No. PCT/JP90/00591 Sec. 371 Date Oct. 24, 1990 Sec. 102(e) Date Oct. 24, 1990 PCT Filed May 9, 1990 PCT Pub. No. WO90/14449 PCT Pub. Date Nov. 29, 1990.The present invention provides a process for surface treatment in which the surface of aluminium or its alloy can be put in a desired color and the improved wear resistance and corrosion resistance can be obtained. Anodic oxidation coatings obtained by conventional alumite treatment is porous and thus is small in wear resistance and in corrosion resistance and is insufficient in durability of coloring. The process of the present invention is characterized in that the process comprises the steps of: forming anodic oxidation coatings by conventional method on the surface of the aluminium or its alloy, thereafter applying an alternating voltage of 10 V DIFFERENCE 30 V within a sulfate solution or nitrate solution of a desired metal to a member on which said anodic oxidation coatings was formed by the above step, whereby said metal is electrolytically impregnated into said anodic oxidation coatings. Thus, the metal is deposited or embedded into porous holes of the anodic oxidation coatings, the wear resistance and corrosion resistance being improved, a desired coloring being performed by the embedded metal.
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