Abstract
Oxide coatings on AM60B magnesium alloy were prepared using the microarc oxidation(MAO) technique in silicate-KOH electrolyte with addition of 0-6.0 g/L Na 2WO 4. The MAO processes in base electrolyte with different concentrations of Na 2WO 4 were studied. The microstructure, compositions and mechanical tribological characteristics of the oxide coatings were also investigated by SEM, XRD, XPS, microhardness analysis and ball-on-disc friction testing, respectively. It is found that the addition of Na 2WO 4 into the base electrolyte has direct effect on the characteristics of voltage—time curves and breakdown voltage in MAO process. The number of micropores at top of the coating surface is increased by the addition of Na 2WO 4. The fraction of forsterite Mg 2SiO 4 in the oxide coating increases with increasing concentration of Na 2WO 4 in base electrolytes. Furthermore, the microhardness and wear resistance of oxide coatings are enhanced as well.
Published Version
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