纳米Al_2O_3掺杂对AM60B镁合金表面微弧氧化膜层结构和耐蚀性的影响  

Effect of Nano-Al_2O_3 Doping on Structure and Corrosion Resistance of Micro-Arc Oxidation Coatings on AM60B Magnesium Alloy

作　　者：张占领[1] 张艳琴 沈华刚[1] ZHANG Zhan-ling ZHANG Yan-qin SHEN Hua-gang(University for Science ＆ Technology Zhengzhou, Zhengzhou 450064, China City University of Zhengzhou, Zhengzhou 452370, China)

机构地区：[1]郑州科技学院,河南郑州450064 [2]郑州城市职业学院,河南郑州452370

出　　处：《材料保护》2017年第3期34-37,共4页Materials Protection

基　　金：郑州市名师工作室资助项目(郑教高[2015]70号)

摘　　要：为促进大面积镁合金表面耐蚀性能优良的微弧氧化膜层的工业化生产,在硅酸盐水溶液中掺杂纳米Al_2O_3颗粒对AM60B镁合金进行微弧氧化;采用扫描电镜、X射线衍射仪及盐雾试验分析了掺杂纳米Al_2O_3颗粒对氧化膜层的形成过程、形貌、成分以及耐蚀性的影响。结果表明:掺杂纳米Al_2O_3微弧氧化膜物相组成主要有MgO、MgAl_2O_4、Mg_2Si_2O_4、Al_2O_3,纳米Al_2O_3的掺杂能提高氧化膜的密度,促进薄膜生长,使表面孔隙分布更均匀,尺寸更小;掺杂纳米Al_2O_3氧化膜的耐蚀性较未掺杂氧化膜的大幅提高。AM60B Mg alloy was treated by micro-arc oxidation in silicate electrolyte doped with Al2O3 nanoparticles. Scanning electron microscopy （ SEM）, X-ray diffraction spectroscopy （XRD） and salt spray test were used to analyze the influence of doping Al2O3 nanoparticles on the formation process, morphology, composition and corrosion resistance of oxidation coating. Results showed that the micro-arc oxidation coating doped with Al2O3 nanopartieles was composed of MgO, MgAl2O4, Mg2Si2O4 and Al2O3 phases. Doping Al2O3 nanoparticles could improve the density of oxidation coating, promote the growth of coating, and make the pores more uniform and the pore size smaller. Besides, the corrosion resistance of oxidation coating doped with Al2O3 nanoparticles was improved significantly, compared with that of undoped oxidation coating.

关 键 词：纳米AL2O3 AM60B镁合金 微弧氧化 耐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]