不同电流密度下TC4钛合金微弧氧化膜的电化学腐蚀行为  

Electrochemical Corrosion Behavior of TC4 Titanium Alloy Micro-arc Oxidation Film Prepared at Different Current Density

作　　者：李明哲[1] 牛宗伟[1] 

机构地区：[1]山东理工大学机械工程学院,山东淄博255049

出　　处：《电镀与环保》2015年第2期31-34,共4页Electroplating & Pollution Control

基　　金：国家自然科学基金(No.51005140);山东省自然科学基金(No.ZR2010EQ037);山东理工大学青年教师发展计划经费资助

摘　　要：分别采用恒流和梯度电流两种模式对TC4钛合金进行微弧氧化,并研究了电流密度对膜层厚度、表面形貌和耐蚀性的影响。结果表明:恒流模式下,随着电流密度的增加,膜层的厚度、表面微孔直径逐渐增大,自腐蚀电位和阻抗值先增大后减小;梯度电流模式下所得膜层较厚、表面微孔直径较小,耐蚀性较好。较适宜的恒流电流密度与梯度电流密度分别为10 A/dm2和15-5A/dm2,且后者所得膜层的耐蚀性优于前者的。TC4 titanium alloy micro-arc oxidation films were prepared respectively with constant current mode and gradient current mode,and the influences of current density on the thickness,surface morphology and corrosion resistance were also investigated.Results showed that,under the mode of constant current,thickness and micro-pore diameter of the film increased with the increasing of current density,while the self-corrosion potential and impendence increased first and then decreased.Under the mode of gradient current,the prepared film has higher thickness,smaller micro-pore diameter and better corrosion resistance.The suitable current density for constant current mode and gradient current mode was 10A/dm^2 and 15-5A/dm^2 respectively,and the film prepared at 15-5A/dm^2 present better corrosion resistance than that obtained at 10A/dm^2.

关 键 词：微弧氧化 钛合金 电流密度 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]