镁合金微弧氧化电解液中纳米SiC添加量对膜组织结构和摩擦磨损性能的影响  

Influence of Dosage of Nanoscale Silicon Carbide in Electrolyteon Microstructure and Friction and Wear Behavior of Micro-Arc Oxidation Coatings on Magnesium Alloy

作　　者：刘启明[1] 王淑艳[1] 刘莉[1] 李涛[1] 杜沣 

机构地区：[1]江苏科技大学冶金与材料工程学院,江苏张家港215600

出　　处：《材料保护》2014年第10期5-8,共4页Materials Protection

基　　金：江苏省高等学校大学生实践创新训练计划重点项目(201310289035Z)资助

摘　　要：为了改善镁合金微弧氧化膜的性能,在Na_2SiO_3-NaAlO_2复合电解液中添加不同含量的纳米SiC对AM50镁合金进行微弧氧化。利用膜层测厚仪、共聚焦激光显微镜(CLSM)、扫描电镜(SEM)、能谱仪分别研究膜的厚度、表面粗糙度、微观形貌和元素分布,采用摩擦磨损试验机对镁合金微弧氧化前后的干滑动磨损行为进行了研究,测量摩擦系数和磨损速率,运用SEM和CLSM对磨损后的形貌进行观察,并用能谱仪分析成分。结果表明:随电解液中纳米SiC含量的增加,微弧氧化膜的厚度和表面粗糙度均增大,颜色加深,膜层的摩擦系数和磨损速率均呈现先减小后增大的趋势;当SiC含量为6g/L时氧化膜的摩擦系数最小、磨损速率最低,耐磨性能较好。Different dosages of nanoscale SiCwere added in Na-Si03-NaA102 composite electrolyte to preparemicro-arc oxidation ceramic coatings on AM50 Mg alloy. The thick-ness, surface roughness, micro-morphology, and elemental composition of the as-prepared micro-arc oxidation ceramic coatings were analyzed. Moreover, the friction and wear behavior of the as-pre-pared ceramic oxidation coatings under dry sliding condition wasevaluated, while the morphology and elemental composition of theworn coating surfaces were also analyzed. Results showed that withthe increase of nano-SiC dosage in the electrolyte, the thicknessand surface roughness of the micro-arc oxidation coatings tended toincrease and their color became darker, while their friction coefficient and wear rate decreased initially but increased later therewith.Particularly, the micro-arc oxidation coating obtained from the elec-trolyte containing 6 g/L nano-SiC exhibited the minimum frictioncoefficient and wear rate, showing good wear resistance.

关 键 词：微弧氧化 Na2SiO3-NaAlO2复合电解液 纳米SIC AM50镁合金 摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]