| Surface modification of biomedical metal materials is one of main research fields for biomedical researchers. The tests were conducted to investigate the technics of anodizing colors of TA2 and Ti-6A1-4V implantation materials. The various factors that influence coloring effect were studied. The structure and surface element distribution of the anode films were researched by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The surface morphology of anode films were observed through scanning electron microscopy (SEM). At the same time, experiments were conducted to test the cell compatibility of the samples after anodize oxidation.The results on composition, structure, and morphology studies, cell compatible experiment revealed the following conclusions: The electrolyte voltage is the main factor affecting the coloring, and the colors change with voltage shifting. On the other side, the time of the processing, alloy elements, electrolyte solutions and subsequent heat treatments of the materials will influence the coloring to different extents. But the state of heat treatments of the substrate samples has little influence on coloring.The surface element of TA2 consists of mainly Ti, O and C. The carbon is owed to surface polluter, and the oxygen comes from two sources, one is surface polluter and another is crystal lattice oxygen. XRD analysis shows the anode films of TA2 and Ti-6A1-4V are un-crystalline oxide titanium. Data from SEM indicates that there is a compactly and sleekly layer on the surface of anode films, furthermore, this passive layer increases resistance of substrate materials. The results from cell compatibility experiment reveal that anodize oxidation treatment can improve the biocompatibility of titanium and its alloy.From the statements above, different colors of substrate materials can be got through the surface modification processing and the biocompatibility of surgical titanium alloys can be improved at the same time.
|
PDF Full Text Request