(1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082；
2. 國(guó)核電站運(yùn)行服務(wù)技術(shù)有限公司，上海 200233；
3. 寧夏大學(xué) 化學(xué)化工學(xué)院，銀川 750001)
摘 要: 采用雙脈沖電流制度對(duì)Ti-6Al-4V合金在鋁酸鈉電解液體系中進(jìn)行等離子電解氧化處理，利用發(fā)射光譜、掃描電鏡和X射線衍射等方法對(duì)合金氧化過(guò)程的發(fā)光行為以及獲得的氧化膜層的顯微組織、相結(jié)構(gòu)進(jìn)行分析，研究膜層的耐腐蝕和耐磨性能。結(jié)果表明：等離子氧化過(guò)程中的發(fā)光光譜中探測(cè)到的譜線主要是Na和Hα的譜線，而那些來(lái)自基體中元素的譜線極其微弱。膜層相結(jié)構(gòu)主要由鈦酸鋁、金紅石以及少量γ-Al2O3構(gòu)成，膜層的微觀結(jié)構(gòu)中分布大量的瘤狀突起。處理1 min的膜層具有最佳的耐蝕性，其腐蝕電流密度為1.14×10-7 A/cm2，比處理時(shí)間較長(zhǎng)的膜層低了將近一個(gè)數(shù)量級(jí)。然而，處理30 min的試樣具有良好的耐磨性，且其內(nèi)層摩擦因數(shù)很低(約為0.2)，這使得該膜層具有耐磨和減摩等功能的潛在應(yīng)用價(jià)值。
關(guān)鍵字: Ti-6Al-4V合金；等離子電解氧化；腐蝕；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
