电流密度对6061铝合金微弧氧化陶瓷层的影响  

Effect of Current Density on Ceramic Coating Prepared by Micro-arc Oxidation on 6061 Aluminum Alloy

作　　者：董海青[1] 牛宗伟[1] 赵东山[1] 李广敏[1] 

机构地区：[1]山东理工大学机械工程学院,淄博255049

出　　处：《腐蚀科学与防护技术》2014年第2期137-142,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(51005140);山东省自然科学基金项目(ZR2010EQ037);山东理工大学青年教师发展支持计划资助

摘　　要：采用恒流控制模式在Na2SiO3电解液体系下制得6061铝合金微弧氧化膜,研究了电流密度对微弧氧化陶瓷膜结构和性能的影响。为了提高膜层性能采用了一种新的电流模式,并与恒流条件下的陶瓷层显微结构和耐腐蚀性进行了比较。结果表明,随着电流密度的不断增大,陶瓷膜的厚度、表面粗糙度也随之增大,耐腐蚀性能逐渐降低,硬度则呈现先增大后减小的趋势,膜层主要由α-Al2O3和γ-Al2O3组成,采用新的电流模式得到的陶瓷膜显微裂纹明显减少,耐腐蚀性明显提高。Micro-arc oxidation coating on 6061 aluminum alloy was prepared in a Na2SiO3 contain- ing electrolyte by a constant current control mode, and the effect of current density on the micro- structure and performance of micro-arc oxidation ceramic coating was studied by a series of tests. Results for the above coatings show that their thickness and surface roughness increase with the in- creasing current density, however, their corrosion resistance decrease, and their hardness increases first and then decreases with the increasing current density. The ceramic coatings are mainly com- posed of ~t-Al：O3 and 7-A1203. As a comparison, a novel current control method was adopted to pre- pare a micro-arc oxidation coating. Accordingly, the amount of micro-cracks was significantly re- duced, and the corrosion resistance was obviously enhanced for the coating prepared by the new mode.

关 键 词：微弧氧化 电流密度 恒流 耐腐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]