The microplasma oxidation process of LY 12 Al alloy in Na2SiO3-KOH-NaAlO2 s
ystem has been studied. The voltage-time curve of oxidation process is chan
ged with the variation of current densities. The voltage breakdown and hard
ness of coating increase with increasing current density. The phase composi
tion, morphologies, element and the distribution of ceramic coating are inv
estigated by XRD, EPMA.