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Ceramic coatings were fabricated on Zr-4 Zirconium Alloy substrates by Plasma Eletrolytic Oxidation(PEO)at the constant current density in three kinds of solutions,NaR3RPOR4R、NaRzRSiOR3R、NaOH.The microstructure,composition.phase constituent of the coatings were investigated by means of SEM、EDS and XRD;The Corrosion Performance of Ceramic Films were evaluated by electrochemicalanalysis.