Mechanical and Friction and Wear Properities of TiO₂ Film Prepared by Anodic Oxidation

TiO2 films with different morphology were prepared on TC4 Titanium alloy surface by anodic oxidation method under the conditions of different electrolyte solutions and reaction voltages.The effects of electrolyte solutions and reaction voltages on the morphology of the film were analyzed,and the microhardness,elasticity modulus and friction and wear properties of the films were tested.The results indicate that the morphology of the film was closely related to the electrolyte solution and the reaction voltage,when the reaction voltage was too low or too high,the film without nanotube structure would be formed.In the HF aqueous solution and inorganic electrolyte containing F-,when the reaction voltage was 10-20 V,the morphology of the films exhibited nanotube structure.In the organic electrolye containing F-,when the reaction voltage was 40 V,the morphology of the film looked like nano-spring structure.The film without nanotube structure had high microhardness,high elastic modulus and low friction resistance.The smaller the ratio of nanotube diameter to wall thickness,the better the mechanical and wear resistance of the film.The films with nano-spring srtucture owned smaller micro-hardness and elasticity modulus,hgher friction coefficient and wear loss.