Preparation and Performance of Ceramic Coatings Formed by Micro Arc Oxidation on Titanium Alloy
The effect of technological parameters on MAO ceramic coating were investigated through the technique of micro-arc oxidation (MAO) on TC4 titanium alloy and. Microstructure and morphology of coatings were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that electric parameters and compositions of the electrolyte have notable effects on the growth of MAO ceramic coatings. The cathodic and anodic voltage rise gradually with the oxidation time increasing. The growth rate of ceramic coating is fast at the beginning, and then turns slowly. The ceramic coatings can be divided into three layers from interior to exterior, such as the transition layer, the dense layer and the porous layer. The coating is mainly composed of rutile and anatase and combined with the substrate firmly. The ceramic coating’s composition in inner and outer layers appears quite different. The ceramic coating on titanium alloy is of excellent performance on anti-attrition and anti-corrosion.
Yingxue Yao, Xipeng Xu and Dunwen Zuo
Y. X. Yao et al., "Preparation and Performance of Ceramic Coatings Formed by Micro Arc Oxidation on Titanium Alloy ", Key Engineering Materials, Vols. 375-376, pp. 323-327, 2008