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.