Ti35合金在沸腾硝酸中钝化膜及过渡层形成及组成分析  

Passive Film and Transition Layer on Ti35 Alloy after Exposure to Boiling Nitric Acid Solution

作　　者：郭荻子[1] 杨英丽[1] 赵彬[1] 赵恒章[1] 吴金平[1] 苏航标[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2015年第1期38-41,共4页Titanium Industry Progress

摘　　要：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Ti O2和Ta2O5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 Ta205, and the is step by step. And corrosion resistance to nitric acid of titanium alloy can effectively improve evolution of these oxides by adding element Ta.

关 键 词：钛合金 腐蚀 氧化反应 钝化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]