Electrodeposition of F-doped hydroxyapatite-TiO2 coating on AZ31 magnesium alloy for enhancing corrosion protection and biocompatibility

Fluorinated hydroxyapatite-titanium dioxide coating (F-doped HA-TiO 2 ) was deposited in situ onto AZ31 Mg alloy using electrodeposition method. XRD and EDS confirmed the crystal structure and composition of the coating. SEM images showed that the F-doped HA-TiO 2 coating on the surface of AZ31 Mg alloy was extremely uniform and the thickness of coating was reflected by the cross-sectional image. Corrosion behavior of the coating modified Mg alloy was tested by electrochemical and immersion experiments. Compared to the corrosion current density ( I corr ) of the uncoated AZ31 Mg alloy in Hank’s solution, the I corr of F-doped HA-TiO 2 coating was decreased almost 4 orders. The coated AZ31 Mg alloy showed superior biocompatibility, which was strongly demonstrated by the amounts of cells increased in cell culture. The results of hemolysis tests also illustrated that the F-doped HA-TiO 2 coating met the requirements of biomedical materials.