有機錯体浴からのNi-W合金めっき用アノードについて

概要

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This study was conducted on the insoluble anode materials that are required to prevent the degradation of a citric acid-ammonia Ni-W alloy plating bath of pH 6, 70°C. Bath degradation occurs by anodic oxidation of citric acid. It accompanies the evolution of CO2 gas from the anode and leads to the formation of highly stressed brittle deposits. Anode materials such as Pt, Pb, graphite, Ni and SUS 304 stainless steel exhibited a problem in terms of vigorous CO2 gas evolution. A specially baked RuO2/TiO2 mixed oxide electrode on a Ti substrate exhibited a problem in terms of service life. Finally, a low polarization, amorphous, insoluble electrode, which completely prevents CO2 gas evolution and possesses a reasonably long service life (∼4000h, at ia=20A/dm2) was found in Ir/Ta mixed oxide system. Pretreatment of the substrate, oxide composition, solvent selection and the baking temperature for the electrode were described. It is expected that the development of such a high performance electrode will render bath maintainance practicable.
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