Corrosion Protection of Biodegradable Magnesium Alloy Implants Using Micro-Arc Oxidation

摘要

Magnesium alloy has good biocompatibility, biodegradation and proper mechanical properties andthereby has the potential to be used as biomedical materials. However, Magnesium alloy may corrodeand degrade too quickly for application in the body. In order to improve the bioactivity and corrosionresistance of the magnesium alloy, a coating is prepared by the micro-arc oxidation (MAO) on thesurface of the substrate. The performance of coated magnesium alloy is characterized using X-raydiffraction (XRD), scanning electron microscopy (SEM), energy dispersion spectrometry (EDS). Thepotentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and immersion test areemployed to evaluate the corrosion resistance and in vitro bioactivity. It is shown that an increase ofcorrosion resistance and improvement of the in vitro bioactivity is found on the coated magnesiumalloy.