Abstract
A cast AM50 magnesium alloy was plasma electrolytic oxidation treated in a silicate based electrolyte using a direct current power source. Plasma electrolytic oxidation coatings produced at four different visible discharge conditions were characterised for their microstructural features, composition, tribological behaviour and corrosion resistance. The chemical composition, thickness and the roughness of the coating were found to be influenced by the processing voltage and thick coatings produced at relatively higher voltage levels provided a better wear and corrosion resistance.
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