Abstract: Objective:To prepare zinc-containing coatings with different concentrations on Ti6Al4V by micro-arc oxidation and compare their microstructure and antibacterial properties.Methods: Four sets of specimens with different zinc concentrations were prepared on the surface of Ti6Al4V by micro-arc oxidation, i.e.non-zinc (N-Zn), low-zinc (L-Zn), medium zinc (M-Zn), and high-zinc (H-Zn) groups.The polished Ti6AL4V (CP) was set as a control.SEM and EDS were used to observe the surface morphology and atomic ratio of the coating.XRD was used to determine the phase composition.Film method was used to determine the inhibitory effect of the test piece on Escherichia coli and Staphylococcus aureus.Results: 1) SEM showed that with the increase of zinc concentration, the surface of the coating became smaller and uniform.However, the coating fracture occurred on the surface of the H-Zn group.2) EDS displayed that compared with the CP group, Ca, P, and other elements appeared on the surfaces of four groups.The ratio of Ca/P was 1.7.3) The results of XRD showed that anatase and rutile were formed on the coating surface.4) Film coating method leaded to conclusion that the colonies in the experimental group had statistically significant differences compared with the CP group (P<0.05).There was no significant difference in the number of colonies between the M-Zn group and the H-Zn group (P>0.05).Conclusion: The zinc-containing coating prepared by the micro-arc oxidation method can enhance the surface antibacterial performance of the specimen, and the antibacterial performance increases with the increase of the zinc concentration of the coating.

Key words: Ti6AL4V, Micro-arc Oxidation, Zinc, Antibacterial