Abstract

SUMMARYThe addition of micrometer sized B4C particles to Au baths for the electrochemical deposition of metal matrix particulate composite Au/ B4C films brings about deposition overvoltage decrease or increase as a function of current density, hydrodynamic conditions and particle content of the bath. The phenomenon was studied by galvanostatic measurements. Surface and cross-sectional morphologies of composites were studied with SEM and image analysis. Overvoltage variations can be rationalised in terms of morphology changes brought about by the interplay of: morphology development, particle screening, growth rate and hydrodynamic effects.

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