Abstract
Some properties of Ni-Al2O3 electro-codeposits on Cu plates were investigated by surface roughness, hardness test, Erichsen test, conical cup test, and measurement of stationary potential-current curve. Specimens were obtained from Watt's bath containing 25-150g/l of alumina particles (1, 0.3, and 0.05μ in particle size).The results obtained were summarized as follows.(1) The alumina content in the codeposits was parabolically increased with the increase in concentration of alumina in the plating bath. The rate of increase was lower with the decrease in the particle size of alumina.(2) Every surface of the specimens had no brightness. When the particle size of alumina was 1μ, the surface was rougher with the increase in alumina content. However, when it was 0.3, or 0.05μ, no effect of alumina content was observed.(3) The surface hardness was linearly increased with the increase in alumina content, and also increased with the decrease in its particle size.(4) The forming property was deteriorated after the plating in all specimens, independent of alumina content and particle size.(5) The corrosion resistance of specimens from 3% NaCl solution was decreased with the increase in alumina contents. The similar tendency was observed for every particle of alumina.
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