(1. 湖南大学 材料科学与工程学院，长沙 410082；
2. 国核电站运行服务技术有限公司，上海 200233；
3. 宁夏大学 化学化工学院，银川 750001)
摘 要: 采用双脉冲电流制度对Ti-6Al-4V合金在铝酸钠电解液体系中进行等离子电解氧化处理，利用发射光谱、扫描电镜和X射线衍射等方法对合金氧化过程的发光行为以及获得的氧化膜层的显微组织、相结构进行分析，研究膜层的耐腐蚀和耐磨性能。结果表明：等离子氧化过程中的发光光谱中探测到的谱线主要是Na和Hα的谱线，而那些来自基体中元素的谱线极其微弱。膜层相结构主要由钛酸铝、金红石以及少量γ-Al2O3构成，膜层的微观结构中分布大量的瘤状突起。处理1 min的膜层具有最佳的耐蚀性，其腐蚀电流密度为1.14×10-7 A/cm2，比处理时间较长的膜层低了将近一个数量级。然而，处理30 min的试样具有良好的耐磨性，且其内层摩擦因数很低(约为0.2)，这使得该膜层具有耐磨和减摩等功能的潜在应用价值。
关键字: Ti-6Al-4V合金；等离子电解氧化；腐蚀；干摩擦
（1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. State Nuclear Power Plant Service Company, Shanghai 200233, China;
3. School of Chemistry and Chemical Engineering，Ningxia University, Yinchuan 750001, China）
Abstract:The plasma electrolytic oxidation(PEO) treatment of Ti-6Al-4V alloy was carried out in an aluminate electrolyte under a pulsed bipolar electrical regime. The luminous behavior of Ti-6Al-4V alloy during the PEO process was investigated under emission spectroscopy (OES), the microstructure and phase structure of the obtained coatings were examined by SEM and XRD, and the corrosion and dry sliding wear properties of the coatings were also evaluated. The results show that the main spectral lines detected during the PEO process are attributed to Na and Hα, and the spectral lines from the substrate element are very weak. The phase compositions of PEO coatings consist of aluminium titanate, rutile and a small amount of γ-Al2O3. A lot of protuberances present in the microstructure of the coating surface. The coating treated for 1 min possesses the most excellent corrosion resistance, showing a corrosion current density of 1.14×10-7 A/cm2, which is nearly one order lower than that of the coatings formed for longer times. However, the coating formed for 30 min shows high wear resistance and a very low friction coefficient of about 0.2 for the inner layer, demonstrating its potential application values.
Key words: Ti-6Al-4V alloy; plasma electrolytic oxidation; corrosion; dry sliding wear
