研究了Ti35合金在8 mol／L 沸腾浓硝酸中腐蚀240 h后表面钝化膜及过渡层的相结构。采用扫描电子显微镜（SEM）、原子力显微镜（AFM）、 X射线衍射（XRD）和X射线光电子能谱（XPS）对Ti35合金腐蚀后样品的钝化膜和过渡层形貌、相结构等进行分析。研究结果表明， Ta原子优先与硝酸反应，钝化膜最终产物TiO2和Ta2 O5是通过逐步的化学反应形成的， Ta元素的加入能有效改善钛合金的耐硝酸腐蚀性能。
The composition and phase constitution of the passive film and the transition layer on Ti35 alloy after immersion corrosion test in 8 mol/L boiling nitric acid were investigated.By using atomic force microscope(AFM), scanning electron microscopy ( SEM) , X ray diffractometer ( XRD) and X ray photoelectron spectroscopy ( XPS) , the corrosion behavior and the structure of the oxide film of Ti35 corrosion samples were investigated.The results show that Ta atoms preferentially react with nitrate.The passive film consists of TiO2 and Ta2 O5 , and the evolution of these oxides is step by step.And corrosion resistance to nitric acid of titanium alloy can effectively improve by adding element Ta.
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