Al3+-Mg2+系浴中からのアルミニウム白色電解着色皮膜

概要

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A white film was obtained by the electrolytic coloring of the anodic oxide film of aluminum in an electrolytic bath containing a mixture of aluminum sulfate and magnesium sulfate. In order to study the mechanism of electrolytic coloring, the anodic stripping was applied to the film in a sulfuric acid bath. As a result, the white film was slightly decolorized by the anodic stripping in a sulfuric acid bath, but the white film, once dipped in hot water over five minutes, was not decolorized at all even by the same stripping chemicals. This implies that magnesium, reduced and deposited in the film pores, was changed to the hydrate and the oxide in hot water. The cross sections of the white films were observed by TEM. The deposition layer, such as the hydrate and the oxide, was observed at the bottom of the film pores. But these depositions were similarly observed in the film that was slightly decolorized by the anodic stripping, and were not changed by the anodic stripping.
色材協会の論文