Microstructure and corrosion resistance of Al203-ZrO2 composite coating on biomedical magnesium alloy fabricated by cathodic plasma electrolytic oxidation
A relatively new method called cathodic plasma electrolytic oxidation (CPEO) was development to fabricate Al203-ZrO2 composite coating on AZ91 biomedical magnesium alloy.The microstructure and properties of the composite coating including phase composition,surface and cross section morphology,thickness and bonding strength were investigated.The corrosion behavior of the coated magnesium alloy in simulated body fluids(SBF) was primarily evaluated.The results showed that the coating was composed of c-ZrO2,α-Al2O3 and γ-Al2O3.The coating surface was coarse and porous with the average pores diameters of 5 μm.The thickness of the coating was about 60 μm and the bonding strength of coating to the AZ91 substrate was 22 MPa.The polarization test indicated that corrosion potential (Ecorr) and corrosion current density (icorr) of the coated samples in SBF were-1.56V and 8.89 × 10-7 A/cm2,respectively,whose corrosion resistance was significantly improved compared to the uncoated sample.
cathodic plasma electrolytic oxidation Al203-ZrO2 coating biomedical magnesium alloy corrosion resistance
Yunlong Wang Miao Wang Zhaohua Jiang
Center for photon Manufacturing Science and Technology, School of Materials Science and Engineering, Research institution of new materials, School of Materials Science and Engineering, Jiangsu Universi School of Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
国际会议
香港
英文
1068-1071
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）