Abstract
Ni-Cr-Y2O3 nanocomposite coating, with Y2O3 nano-particles finely dispersed, was prepared by cathode plasma electrolytic deposition from environmental-friendly nickel-trivalent chromium sulfate electrolyte directly. The coating is dense and uniform with typically molten morphology, possessing a nanocrystalline structure with an average grain size of about 30–50 nm. Owing to the synergy effect of the fine-grained structure of the coating and the reactive-element effect of the addition of Y2O3 nano-particles, a thin, compact, uniform and continuous Cr2O3 oxide scale can be formed during 200 h oxidation at 750 °C. Such Cr2O3 oxide scale provides effective protection to the inner alloy and substrate.
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