Synthesis and properties of CaTiO3-containing coating on AZ31 magnesium alloy by micro-arc oxidation

Magnesium and its alloys are thought as biodegradable implant materials due to their attractive biological properties. But the application of magnesium is still hampered by their poor corrosion resistance and inert bioactivity in physiological circumstances. In this article, a CaTiO3-containing coating was deposited on AZ31 magnesium alloy surface by micro-arc oxidation (MAO). The microstructure and composition were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The corrosion behavior and apatite-forming ability were studied by electrochemical tests and immersing in simulated body fluids (SBF). The results show that the MAO coating significantly improves the corrosion resistance of AZ31 magnesium alloy and enhances the apatite formation ability. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.