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Electric multicoloring of alkaline anodized alumina films by applying A.C current was investigated in aqueous amine solutions containing metallic salts and boric acid. The anodized films were colored uniformly in the baths containing diethanol amine or triethanol amine. Green colored films were obtained in a copper sulfate-triethanol amine bath. Blue, yellow, purple, and green films were obtained in a nickel sulfate-boric acid-triethanol amine bath. Brown colored films were obtained in a cobalt sulfate-boric acid-triethanol amine bath. The amine group was found to be present in the colored films by means of X-ray photoelectron spectroscopy. It was suggested that metal-amine complexes were deposited in the pores of the alumina films.
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