Effect of DC Plasma Electrolytic Oxidation on Surface Characteristics and Corrosion Resistance of Zirconium.

摘要: Zr is a valve metal, the biocompatibility of which at least on par with Ti. Recently, numerous attempts formation bioactive coatings by plasma electrolytic oxidation (PEO) in solutions that were based calcium acetate and β-glycerophosphate made. In this study, direct current (DC) PEO commercially pure zirconium contained Ca(H2PO2)2, Ca(HCOO)2, Mg(CH3COO)2 was investigated. The treatment conducted 75 mA/cm2 up to 200, 300, or 400 V. Five process stages discerned. higher voltages resulted oxide layers had Ca/P (Mg+Ca)/P ratios close hydroxyapatite (Ca/P = 1.67), determined SEM/EDX. corrosion resistance studies performed using electrochemical impedance spectroscopy (EIS) DC polarization methods. R(Q[R(QR)]) circuit model used fit EIS data. general, obtained 200 V most resistant, however, they lacked porous structure, typical for coatings, sought after biomedical applications. more resistant than those 300 This mainly prevailing regime given voltage. pitting also improved treatment, regardless applied conditions.