In vitro corrosion resistance and antibacterial performance of novel tin dioxide-doped calcium phosphate coating on degradable Mg-1Li-1Ca alloy

A SnO2-doped calcium phosphate (Ca-P-Sn) coating was constructed on Mg-1Li-1Ca alloy by a hydrothermal process. The fabricated functional coatings were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). A triple-layered structure, which is composed of Ca-3(PO4)(2), (Ca, Mg)(3)(PO4)(2), SnO2, and MgHPO4 center dot 3H(2)O, is evident and leads to the formation of Ca-10(PO4)(6)(OH)(2) in Hank's solution. Electrochemical measurements, hydrogen evolution tests and plating counts reveal that the corrosion resistance and antibacterial activity were improved through the coating treatment. The embedded SnO2 nanoparticles enhanced crystallisation of the coating. The formation and degradation mechanisms of the coating were discussed. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.