C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/10, 204/24.6
C25D 11/20 (2006.01) C25D 9/02 (2006.01) C25D 11/04 (2006.01) C25D 11/06 (2006.01) C25D 11/22 (2006.01)
Patent
CA 2028107
A B S T R A C T 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 resisitance and is insufficient in durability of coloring. The process of the present invention is characterized in that the process comprisses 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 10V-30V 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 oxiation coatings. Thus, the metal is deposited or embeded into porous holes of the anodic oxidation coatings, the wear resistance and corrosion resistance being improved, a desired coloring being performed by the embeded metal.
Mitani Minoru
R. William Wray & Associates
LandOfFree
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