镁合金的等离子体电解氧化工艺优化及膜的耐腐蚀性  

Optimization of Plasma Electrolytic Oxidation Process and Corrosion Resistance of Oxide Coatings

作　　者：陈砺[1] 彭家志[1] 严宗诚[1] 王红林[1] 王丽[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2009年第12期49-52,共4页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省科技计划项目(2005B50101001)

摘　　要：为优化AZ31镁合金的等离子体电解氧化工艺,并对制得的陶瓷膜的耐腐蚀性能进行电化学动力学研究.利用四因素(Na_2SiO_3浓度、KOH浓度、电解氧化电压和电解氧化时间)、三水平的田口方法优化工艺条件,并采用动电位极化曲线扫描评价AZ31镁合金等离子体电解氧化陶瓷膜的耐腐蚀性能.结果表明:该陶瓷膜的耐腐蚀性能受田口正交矩阵中各水平的影响显著,KOH质量浓度对耐腐蚀性能的影响最大;耐腐蚀性能的最优实验参数为:Na_2SiO_3质量浓度20 g/L,KOH质量浓度4 g/L,电解氧化电压300 V和电解氧化时间40min。In order to optimize the plasma electrolytic oxidation （PEO） process of AZ31 magnesium alloy and investigate the corrosion resistance of the prepared ceramic coatings in terms of electrochemical kinetics, the Taguchi method was used to perform an orthogonal test in terms of four factors （namely, Na2SiO3 concentration, KOH concentration, electrolytic oxidation voltage and time） and three levels, and the corrosion resistance of the PEO ceramic coatings was evaluated by scanning the potentiodynamic polarization curve. It is found that the three levels in the Taguchi orthogonal array all significantly influence the corrosion resistance, and KOH mass concentration is a major affecting factor; and that, when the PEO is performed with 20g/L Na2SiO3 and 4g/L KOH at 300 V for 40rain, the ceramic coatings are of the highest corrosion resistance.

关 键 词：等离子体电解氧化 田口方法 陶瓷膜 AZ31镁合金 

分 类 号：TG174.415[金属学及工艺—金属表面处理]