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Magnesium-zinc(Mg-Zn)alloys are strong candidates as medical implant materials due to their good biocompatibility and relatively high strengths.To manipulate the degradation of Mg-Zn alloy in the human body,a plasma electrolytic oxidation(PEO)treatment was applied to Mg-10%wt.Zn in this study because it produces a coating that is non-harmful to the human body and the process is inexpensive and environmentally friendly.Potentiodynamic polarization corrosion tests,performed in a simulated body fluid(Hanks Balanced Salt Solution)were applied to the coated and uncoated Mg-Zn samples.