纳米TiO_2添加剂对ZL101A铝合金微弧氧化膜耐蚀性能的影响  

Effects of Nano-Additive TiO_2 on Corrosion Resistance of Micro-Arc Oxidation Ceramic Coatings Formed on ZL101A Aluminum Alloy

作　　者：张宇[1,2] 范伟[1] 杜海清[1] 曾丽[1] 宋仁国[3] 

机构地区：[1]浙江工业职业技术学院机械工程学院,浙江绍兴312000 [2]浙江工业大学特种装备制造与先进加工技术教育部/浙江重点实验室,浙江杭州310014 [3]常州大学材料科学与工程学院,江苏常州213164

出　　处：《材料保护》2017年第4期69-72,共4页Materials Protection

基　　金：绍兴市公益性技术应用研究计划项目(2015B70005);浙江省公益技术应用研究计划项目(2017C31039);国家自然科学基金项目(51371039)资助

摘　　要：目前,关于纳米TiO_2含量对铝合金微弧氧化膜耐蚀性的影响报道较少。在硅酸盐电解液中加入不同浓度纳米TiO_2,在ZL101A铝合金表面制备微弧氧化膜。采用扫描电镜(SEM)、X射线衍射仪(XRD)、电化学极化曲线及交流阻抗等,研究了纳米TiO_2浓度对微弧氧化膜耐蚀性能的影响。结果表明:纳米TiO_2进入到微弧氧化膜中,膜层表面变得更加致密;随着纳米TiO_2浓度的增加,膜层在3.5%Na Cl溶液中的腐蚀电流密度不断减小,交流阻抗不断增大,膜层的耐蚀性明显提高;综合考虑形貌和耐蚀性,本工作中纳米TiO_2最佳浓度为20 g/L。TiO2-containing ceramic coatings were prepared on ZL101A aluminum alloy substrates by micro-arc oxidation （MAO） in silicate electrolytes doped with different concentrations of nano-TiO2.The effects of nano-additive concentration on corrosion resistance were investigated by means of SEM,XRD and electrochemical workstation.Results showed that nano-particles were incorporated into the resulting coating during the MAO process,and the ceramic coatings became more compact.Besides,with the increase of TiO2 concentration in the electrolyte,the corrosion current density was decreased and the alternating current impedance was increased,indicating that the corrosion resistance of coatings was increased consequently.Furthermore,the optimized concentration of TiO2 in the electrolyte was 20 g/L.

关 键 词：微弧氧化 ZL101A铝合金 纳米TIO2 耐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]