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The corrosion resistance of Pt-electroplated Al specimens pretreated in an anodic oxidation bath containing 30% of H3PO4 or 15% of H2SO4 (at -6-40°C) was studied under various conditions of plating and anodic oxidation. The Pt-plating bath was called Pfanhauser's solution, containing H2PtCl6·6H2O 34.33g, (NH4)2HPO4 30.00g, and Na2HPO4·12H2O 300.00g in 1000ml. After plating for 1min, under 10±0.5Amp/dm2 (at 70±2°C), the Al specimen was taken out of the bath and polished with an emery paper (8/0). Then, it was again dipped in the above plating bath. The specimen, which had been plated for three times of the above 1min. operating cycles (average thickness: 2μ), was observed as plane as a smooth platinum by examination under microscope (×100). According to the corrosion resistance tests of Pt-plated Al specimens in HCl(pH=3) at 80±1°C for 1hr., it was found that the anodic oxidation time was optimum at 30min, for 99.84% Al and 60min, for 99.9% Al, and the temperature of anodic oxidation was optimum at -6°C.
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