Zirconia (ZrO2) as a ceramic biomaterial facilitates the osteoconductivity in new bone formation around implant. Surface
characterization before and after electrochemical testing was performed used scanning electron microscopy (SEM). The
electrochemical properties of the yttrium oxide stabilized zirconium oxide (YSZ) coated and uncoated MgCa sample with the
open circuit potential at different immersion time in Ringer’s solution were studied by electrochemical impedance spectroscopy
(EIS). Equivalent circuits (ECs) were used to modeling EIS data, in order to characterize YSZ-coated and uncoated MgCa
surface. The polarization resistance of the YSZ coated and uncoated MgCa decreases with the immersion time. However, after 2-
days immersion in Ringer’s solution the corrosion resistance presenteded bigger value for the uncoated (360 Ω cm2) than YSZ
coated (140 Ω cm2) MgCa alloy. The present study, showed that electrochemical determinations can be a usefull tool to
characterize such alloys. Knowledge of in vitro corrosion behaviour of these alloys may lead to a better undersanding of any
biologically adverse effects in vivo.