硫酸亜鉛浴からのアルミナ複合めっきにおける溶液pHの影響

概要

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The influence of solution pH on composite ceramic deposition from zinc sulfate baths containing a suspension of alumina particles averaging 1μm in diameter for use as an abrasion-resistance material was investigated, and the following results were obtained.(1) Zinc ions adsorbed on the alumina particles, in amounts that incrcased with inceases in solution pH until the surface was saturated by the adsorbate.(2) An amount of alumina particles in an electrodeposited composite coating increased with increases in solution pH, reaching a maximum at the pH at which the precipitation of zinc hydroxide began.(3) Part of the zinc hydroxide adsorbed on the alumina particles and on the cathode was reduced electrolytically to melallic zinc and this electrolytic reduction of the zinc hydroxide also advanced the codeposition of the alumina particles into the composite coating.(4) Some zinc hydroxide was always present in the electrodeposited composite coating as a nonmetallic impurity.
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