Na_2SiO_3电解液体系下正负向电压对Ti6Al4V合金微弧氧化膜层特性的影响  

Effects of Forward/Reverse Voltages on Characteristics of Films Formed on Surface of Ti6Al4V in Na_2SiO_3 Electrolyte System by Microarc Oxidation

作　　者：张雅萍[1,2,3] 刘向东[1,2] 吕凯[1,2] 车广东[1,2] 闫淑芳[1,2] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古自治区材料成型及控制工程重点实验室,内蒙古呼和浩特010051 [3]内蒙古化工职业技术学院,内蒙古呼和浩特010011

出　　处：《铸造技术》2011年第2期184-188,共5页Foundry Technology

基　　金：内蒙古自治区人才开发基金项目(200805)

摘　　要：采用Na2SiO3电解液体系,在不同的正、负向电压条件下对Ti6Al4V合金进行微弧氧化。利用测厚仪、SEM、XRD等手段分析微弧氧化膜厚度、表面形貌、相组成,研究正、负向电压对氧化膜层特性的影响规律。试验结果表明,负向电压恒定在80 V时,随着正向电压由350 V增加到400 V,氧化膜厚度由48μm增加至94μm;固定正向电压为380 V,负向电压由50 V增加至90 V,氧化膜厚度先增加,后减小;正、负向在380 V/80 V时获得的氧化膜致密且与基体结合良好;正向电压增加,有利于得到更多的锐钛矿相TiO2;增加负向电压,有利于得到更多的金红石相TiO2。In Na2SiO3 electrolyte system,ceramic coating was obtained by micro-arc oxidation on the surface of Ti6Al4V alloy at different forward/reverse voltages.The effects of forward/reverse voltages in micro-arc oxidation process on the characteristics of coating were investigated by eddy current thickness meter,SEM and XRD.The results show that the thickness of coatings increases form 48 μm to 94 μm with increase of forward voltage from 350 V to 400 V at a constant reverse voltage of 80 V.Whereas,at a constant forward voltage of 380 V,the thickness of coatings increases gradually to certain extent and decrease soon with increase of forward voltage from 50 V to 90 V.It is found by SEM that the coatings formed at 380 V/80 V forward/reverse voltages possess high density and excellent adhesion with the substrate.The results of XRD analysis show that rutile phase TiO2 in coatings increases with the increase of forward voltage.However,a high reverse voltage benefits formation of anatase phase TiO2.

关 键 词：TI6AL4V 微弧氧化 正向电压 负向电压 氧化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]