Electrochemical and sem characterization of ysz coated cocrmo alloy processed by plasma sprayed technique

Abstract

The CoCrMo alloys have been widely used in artificial knee or hip joints. It is well known that these materials have a good corrosion resistance and acceptable biocompatibility properties. Zirconia as a ceramic biomaterial facilitates the osteoconductivity and tissue osteogenetic capacity in new bone formation around implant. Linear polarization and electrochemical impedance spectroscopy (EIS) were employed to characterize the electrochemical behavior of plasma sprayed yttrium oxide stabilized zirconium oxide (YsZ) coated CoCrMo alloy in Ringer solution. Surface characterization before and after electrochemical testing was performed used scanning electron microscopy (SEM). YsZ-coated showed higher zero corrosion potential (ZCP) and lower corrosion current density (icorr) compared with the CoCrMo substrate. The electrochemical properties of the coated CoCrMo sample at the open circuit potential at different immersion time in Ringer solution were studied by EIS. Equivalent circuit (EC) was used to modeling EIS data, in order to characterize YsZ-coated CoCrMo surface.