Preparation of porous anatase titania film

Abstract

A porous anatase titania film was prepared by a composite oxidation method on pure titanium surfaces, which was in a combination of pre-anodic oxidation and micro-arc oxidation treatment. In the pre-anodic oxidation treatment, the sample was immersed in oxalic acid solution using a DC power supply. In micro-arc oxidation treatment, the sample was put into β-glycerophosphate di-sodium salt and calcium acetate electrolytic solution by using an asymmetry pulse power supply. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with EDS spectrum instrument were employed to characterize the phase, composition and microstructure of the film. A micro-hardness tester was employed to test the hardness of the formed film and a scratching machine to evaluate the bond strength of the film. XRD indicated that the film formed by pre-anodic oxidation was composed of a thin anatase film, which was uniform and even. While the film prepared by micro-arc oxidation treatment was porous and uneven, with a porous size of 1–3 μm. XRD showed that the porous film was also made up of anatase. The micro-hardness of the porous film was 645 HV 0.2 and the bond strength of the porous film 36.3 N. The formed film is expected to have significant applications as medical implants.