After electrolytically etched pattern graining surface of aluminum alloy, it is shows that there are porous oxide film containing α Al 2O 3 and α Al 2O 3 by means of SEM XRD and XPS analysis. In the ditches, anodic oxidation makes pore density and diameter larger than other areas, and causes more coloring metal depositing and mutual cross linking. The electrolytically etched pattern surface shows relative deeper color on the ditches and lighter color on other areas, so it can be used for decoration. Electrolytic coloring metal exists in forms of Ag colloid and Ag 2O. Both anodic oxidation and electrolytic coloring affect the surface microstructure of aluminum alloy.
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