Electrolytic White Coloring of Titanium in H<SUB>3</SUB>PO<SUB>4</SUB>-H<SUB>2</SUB>SO<SUB>4</SUB>-Al<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB>-ZnSO<SUB>4</SUB>System Electrolytic Bath
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概要
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Anodic oxidation (electrolytic coloring) of titanium was carried out at voltages exceeding the spark-discharge voltage in an electrolytic bath in which aluminum sulfate and zinc sulfate were added to the mixture solution of phosphoric acid and sulfuric acid. As a result, a white film which was whiter than the film obtained in the electrolytic bath without zinc sulfate was obtained.<BR>The reason why this white film was obtained was as follows. when the anodic oxide film was grown up by spark-discharge, aluminum and zinc oxides (hydrates) which were produced by thermal hydrolysis were mixed in the film by heat-melt adhesion. These oxides in the film were distributed in the direction of the depth of the film at nearly the same ratio.
- Japan Society of Colour Materialの論文