'In-situ' Preparation of TiO2 Composite Layer upon Ti Alloy Substrate Using Micro-arc Oxidation and Its Photocatalytic Property

摘要

In this paper, a micro-arc oxidation (MAO) approach is introduced for "in-situ" preparing TiO_2 composite layer upon the surface of titanium alloy (Ti-6A1-4V) substrate. The surface morphologies, chemical compositions, crystal microstructure and photocatalytic properties of the layers were investigated by using a field emission scanning electron microscope (FE-SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), electro-chemical workstation and UV-Vis spectrophotometer. The experimental results revealed that photocatalytic performance of the TiO_2 composite layers was much higher than that of the pure TiO_2 layer and also exhibited absorption under the visible light irradiation.