AZ31镁合金表面纳米Al_2O_3涂层的耐蚀耐磨性能研究  

Investigation on corrosion and wear resistance of AZ31 magnesium alloy by single layer nanocrystalline Al_2O_3 thin film

作　　者：高正源[1] 潘复生[1] 汤爱涛[1] 程毅[1] 

机构地区：[1]重庆大学材料科学与工程学院,国家镁合金材料工程技术研究中心,重庆400045

出　　处：《功能材料》2013年第8期1069-1072,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50725413);国家重点基础研究发展计划(973计划)资助项目(2007CB613704);重庆市科委资助项目(2010CSTC-HDLS)

摘　　要：在AZ31表面磁控溅射单层纳米Al2O3涂层,用FESEM、TEM、XRD等分析涂层的形貌和结构,用电化学工作站和摩擦磨损实验研究了涂层的耐蚀和耐磨性能。结果表明,磁控溅射获得了界面结合良好的单层致密的纳米Al2O3陶瓷涂层,在3.5%(质量分数)NaCl溶液中腐蚀电位从-1.812V提高到了-1.298V,电流密度从2.009×10-4 A/cm2下降到了6.792×10-6 A/cm2;摩擦系数从0.21下降到了0.15,磨痕从841窄化为400μm。综上所述,磁控溅射单层纳米Al2O3涂层显著地改善了镁合金的耐腐蚀和耐磨损性能。A novel protective coating, consisting of single layer （nanocrystalline Al2O3 thin film）, was deposited on the surface of AZ31 magnesium alloy. Electrochemical system and tribological tester were performed to investigate the wear and corrosion resistance of the coated AZ31 magnesium alloy, respectively. The coating reduced its friction coefficient from 0.21 to 0.15, which consequently induced a great improvement of the magnesium alloy＇s wear resistance. Furthermore, the corrosion resistance of the AZ31 magnesium alloy with the coating was also enhanced with the corrosion current density decreasing from 2. 009 ×10- 4 A/cm^2 to 6. 792 ×10 6A/cm2 in a 3.5wt% NaCl solution.

关 键 词：纳米陶瓷涂层 镁合金 显微组织 耐磨性能 耐腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]