アルカリ性白金-亜鉛合金浴からの析出物の特性 [in Japanese] Characterization of Alkaline Platinum-Zinc Alloy Plating Bath Deposits [in Japanese]
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We studied platinum-zinc alloy plating by adding zinc to an alkaline platinum bath that used hexahydroxoplatinate.<br>Hexachloroplatinate solution and potassium hydroxide were mixed to prepare a potassium hexahydroxoplatinate solution. Zinc oxide was dissolved into the potassium hydroxide solution. These solutions were then used to compose a platinum-zinc alloy plating bath.<br>We then analyzed deposition efficiency, alloy composition, crystal structure, and the appearance of the precipitated deposit.<br>Deposition efficiency increased as zinc was added. When up to 0.7g/L of zinc had been added, the deposit contained 90wt% of platinum and 10wt% of zinc. The ratio of zinc to platinum in the deposit was higher than that in the plating solution.<br>A mirror-bright platinum-zinc alloy of 3μm was plated on copper panel and the substrate was dissolved in nitric acid to fabricate a foil. The foil, however, was destroyed by bending.<br>Zinc codeposited at 5wt% yielded a mirror-bright deposit, but the ductility of the deposit was poor.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 49(1), 88-91, 1998-01-01
The Surface Finishing Society of Japan