ダイヤモンド砥粒を含むニッケル電着膜の密着性

概要

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The influences of the surface roughness of the substrate, current density of electrodeposition and distribution density of diamond grits on the adhesion of electrodeposited nickel film are investigated. Adhesion of the deposited films was evaluated by the elongation of specimens in which the film deposited on the substrate separated from it or divided into several parts in tension testing. The surface roughness of the substrate was varied from 0.1 to 2.5μm, and the current density of electrodeposition ranged from 1 to 7A/dm2. Tension testing was carried out at a constant tensile rate of 5mm/min. It was found that the adhesion of the film relative to substrate tension increased with increasing surface roughness. Dependence of adhesion on current density was not so marked, but higher current densities resulted in somewhat better adhesion. The presence of diamond grit in a deposited film increased the adhesion of the film. This is attributed to a retardation of film division due to the grit having the effect of a barrier to crack extension. Film separation or division occuring during tension tests was classified by appearance into three patterns.
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