热氧化温度对TC4钛合金在生理盐水中腐蚀磨损性能的影响

Effects of Thermal Oxidation Temperature on Tribocorrosion Performance of TC4 Alloy in Physiological Saline Solution

本文中考察了在大气环境下经热氧化处理后TC4钛合金在生理盐水中的腐蚀磨损性能,重点研究了热氧化温度(500~900℃)对TC4钛合金的表面氧化物薄膜的结构及腐蚀磨损性能的影响.结果表明:经热氧化处理后TC4钛合金表面的氧化膜的结构主要由三部分组成:TiO2与α-Al2O3混合组成的表层,以TiO2为主的亚表层以及氧扩散层内层,热氧化温度对氧化膜的物相结构、表面硬度、膜基结合性能和腐蚀磨损性能有显著影响,其中,在700℃下热氧化处理获得的氧化层膜基结合性能最好,表面硬度最高,耐腐蚀磨损性能最好.

The tribocorrosion performance of TC4 titanium alloy after thermally oxidized(TO)in atomosphere was discussed.The effect of TO temperature on the characteristics of the oxide layer and tribocorrosion performance of TC4 alloy obtained at temperature range of 500~900℃was evaluated.The results show that the TO layer consisted of three sections:top layer of TiO2,andα-Al2O3,sub-surface layer of TiO2,and oxygen diffusion zone.TO temperatures have a significant influence on the phase structure,surface hardness,and tribocorrosion resistance of TO layers.TO samples,obtained after treated at 700℃,offer best tribocorrosion resistance in 0.9%NaCl solution for higher surface hardness,more noble corrosion potential,and lowest mass loss in comparison with other TO ones and TC4 substrate.