硫酸亜鉛浴からのアルミナ複合めっきにおける拡散層の平均厚み

概要

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The average thickness of the diffusion layer in composite deposition was studied by means of atomic absorption analysis of the cadmium content of deposits obtained as zinc-cadmium alloy from a zinc sulfate solution containing both suspended α-alumina particles and 10-3mol/dm3 cadmium sulfate. Plating was performed using a circular coplanar concentric cell consisting of a copper cathode 36cm2 in surface area around a columnar zinc anode, under stirred conditions.Use of this cell resulted in superior reproducibility of the α-alumina particle content of the deposits and in uniformity in their appearance. Average diffusion layer thickness decreased with increasing stirring velocity until the solution began a whirlpool flow, and was independent of the concentration of the α-alumina particles suspended in the plating solution at constant stirring velocity.
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