Abstract
Titanium and its alloys are widely used in orthopedic implant materials due to their excellent mechanical properties and good biocompatibilities. However, titanium lacks biological activity and is prone to complications, such as loosening and sinking after implantation. Modifying the surface of titanium can improve its biological activity. In this study, we prepared a cobalt–titania (Co–TiO2) coating on a titanium surface by means of micro-arc oxidation technology. Scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron energy spectrometry (XPS) and automatic scratch tests were used to check the bond strength of the coating. The surface morphology and structure of the modified coating were characterized; the results showed that when the micro-arc oxidation electrolyte solution contained cobalt gluconate, cobalt was successfully introduced into the titanium surface, the coating exhibited a porous morphology, the elemental cobalt was evenly distributed in the coating, and the introduced cobalt did not change the surface morphology and phase composition of the coating. The scratch tests showed that the coating was strongly bonded with the substrate. In conclusion, Co–TiO2 coatings can be prepared on the surfaces of titanium implants by micro-arc oxidation. The coatings showed good surface characteristics and potential clinical application value.
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