ヘキサヒドロオクソ白金酸塩を用いたアルカリ性白金電鋳浴 [in Japanese] Alkaline Platinum Electroforming Bath Using Hexahydroxoplatinate [in Japanese]
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We studied the influence of bath composition, operating conditions, and impurities on a platinum electroforming bath using hexahydroxoplatinate salt.<br>The effect of bath temperature on deposite were studied using a platinum concentration of 13g/L and a pH of 135.<br>Crack-free deposits resulted at temperatures of exceeding 85°C. At a platinum concentration of 26g/L, the pH was 13.5 and temperature 90°C, yielding a 60μm platinum foil. The platinum content of deposits exceeded 99.9%, which contained palladium, rhodium, gold, silver, copper, and iron impurities.<br>X-ray diffraction imaging showed a strong (200) orientation on ductile deposits.<br>Deposit hardness exceeded 300Hv and hardness decreased in heat treatment exceeding 600°C.<br>The bath thus is easily influenced by impurities.<br>Calcium is thought to be a deterioration agent.<br>The presence of calcium, strontium or barium made the deposit less ductile and brighter.<br>The influence of alkaline earth metals was eliminated through electrolysis, coprecipitation with magnesium hydroxide, and absorption to chelate resin.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 48(7), 719-722, 1997-07-01
The Surface Finishing Society of Japan