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The microstructures of anodic oxide coatings of aluminum, which had been treated for coloring in aq. solutions of various inorganic salts, was studied with an electron microscope and an electron microdiffractometer of high resolving power. Aluminum had previously been coated with porous anodic films by the electrolysis in sulfuric acid bath for the following 4 experiments. (1) By electrolysis of the anodic films with alternating current in aq. solution of NiSO4, Ni and NiO crystals were deposited in the coatings and the color of films was changed to brown. (2) By the same treatment as (1) in aq. solution of CuSO4, the films turned to reddish brown color and the crystallization of copper was observed in the layers. (3) Reddish yellow films were observed when the coatings were continuously dipped in aq. solution of (NH4)3 Fe(C2O4)3, and the precipitations of Fe3O4 was observed in the oxide layers. (4) When the coatings were alternately immersed in aq. solutions of Cd(Ac)2 and (NH4)2S, the formation of CdS pigments was observed in the yellow coatings.

Microstructures of Anodic Coatings of Aluminum Treated with Inorganic Substances