NaOH对铝合金A356微弧氧化膜形成及其耐蚀性的影响  

Effects of NaOH on Micro-arc Oxidation Coating and its Corrosion Resistance of A356 Alloy

作　　者：杨建[1,2] 李元东[1,2] 马颖[1,2] 吕维玲[1,2] 文靖[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金省部共建教育部重点实验室,兰州730050

出　　处：《中国表面工程》2008年第5期49-53,共5页China Surface Engineering

基　　金：甘肃省有色金属新材料省部共建国家重点实验室开放基金项目(SKL–2004–09);兰州理工大学优秀青年教师培养计划项目

摘　　要：电解液采用NaOH–Na2SiO3体系,对铝合金A356进行微弧氧化。通过改变NaOH浓度研究起弧电压、成膜速率的变化规律以及NaOH浓度的变化对膜层耐蚀性的影响。试验结果表明,随着NaOH浓度从1g/L到5g/L逐渐增加,起弧电压从350V降低到230V,成膜速率在NaOH浓度为4g/L时出现最大值0.8μm/min;耐蚀性从19min提高到25min;综合各种因素,理想膜层的NaOH最佳浓度为4g/L。The ceramic coating was prepared by micro arc oxidation on A356 in NaOH-Na2SiO3 electrolyte. The influence of concentration of sodium hydroxide on the arcing anodic voltage, the rate of ceramic coatings formation and its corrosion resistance were investigated. The result shows that the arcing anodic voltage is reduced to 230 V from 350 V, corrosion resistance time is increased to 25 min from 19 min, while the concentration of sodium hydroxide rises 5 g/L from 1 g/L; the formation rate of ceramic coatings is maximized when the concentration of sodium hydroxide is 4 g/L. In a word, the suitable concentration of sodium hydroxide is 4 g/L

关 键 词：微弧氧化 铝合金 起弧电压 成膜速率 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG174.453[金属学及工艺—金属学]