酒石酸钠体系中TC18钛合金阳极氧化膜的制备、表征与疲劳性能

在以酒石酸钠为成膜剂的新型无氟环保电解液体系中对TC18钛合金进行阳极氧化，制备出一种钛合金阳极氧化膜。通过扫描电子显微镜和拉曼光谱仪分析了阳极氧化膜的形貌和相结构。采用电化学方法研究了阳极氧化后TC18钛合金的耐腐蚀性能。采用万能高频疲劳试验机进行高频疲劳试验。结果表明：膜层具有沟壑与鼓包的表面形貌。膜层具有非晶态、锐钛矿型及金红石型TiO₂结构，可能有板钛矿TiO₂结构。阳极氧化后TC18钛合金的耐蚀性有显著的提高。阳极氧化后TC18钛合金的拉伸性能与疲劳性能基本不降低，相比于传统硫酸-磷酸型阳极氧化，拉伸性能和疲劳性能得到了一定的改善。

Preparation,Characterization and Fatigue Performance of Anodic Oxide Film on Titanium Alloy TC18 in Sodium Tartrate Electrolyte

Anodic oxide of titanium alloy TC18 in the film-forming agent of sodium tartrate, a new environmentally friendly electrolyte system without hydrofluoric acid, is investigated and the anodic oxide films are successfully prepared. Morphology and phase structure are studied using scanning electron microscopy and Raman spectrometer. Corrosion resistance of TC18 titanium alloy after anodizing is investigated by adopting electrochemical method. The behaviors of high frequency fatigue are tested on the universal high frequency fatigue testing machine. The results show that films has the surface morphology of ravines and bulge. Amorphous TiO₂, anatase phase and rutile phase exist in that films, and brookite phase may also exist in that films. After anodic oxidation, the corrosion resistance of TC18 titanium alloy is significantly improved. Compared to the traditional anodic oxidation in sulfuric acid-phosphoric acid, anodic oxidation in sodium tartrate does not decrease the tensile performance and fatigue performance of TC18 titanium alloy, which means that tensile performance and fatigue performance is well improved.