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-TiO2) 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-TiO2 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-TiO2 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-TiO2 coating met the requirements of biomedical materials.

Automated summary

Fluorinated hydroxyapatite-titanium dioxide coating (F-doped HA-TiO2) was successfully deposited onto AZ31 Mg alloy using electrodeposition method. The coating exhibited uniform structure and thickness. The modified coating significantly enhanced the corrosion resistance of AZ31 Mg alloy and showed superior biocompatibility.