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Magnesium alloy has attracted great attention as an orthopedic biodegradable implant material due to its close mechanical properties to natural bone and perfect biocompatibility. But the corrosion of magnesium alloy (AZ91 Mg alloy) in physiological solution limits their biomedical application. In the present work, surface treatment of AZ91 Mg alloy was performed in the mixed acid solution and bioactive strontium substituted hydroxyapatite (Sr-HAP) was electrodeposited on the surface treated AZ91 Mg alloy. The Sr-HAP coating was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), high resolution scanning electron microscopy (HRSEM) and energy dispersive X-ray analysis (EDX) and adhesion strength. The corrosion resistance of the electrodeposited SrHAP on the AZ91 Mg alloy in simulated body fluid (SBF) was evaluated using potentiodynamic polarization studies. Hence, the Sr-HAP coated on surface treated AZ91Mg alloy is predicted to be the most suitable coating material for orthopedic implants.

CORROSION AND BIODEGRADABILITY EVALUATION OF STRONTIUM SUBSTITUTED HYDROXYAPATITE COATING ON SURFACE TREATED AZ91 Mg ALLOY FOR BIOMEDICAL APPLICATION