电流密度对AZ 31B镁合金阳极氧化及膜层性能的影响  

Effects of Current Density on AZ 31B Magnesium Alloy Anodizing Process and Performance of the Anodized Film

作　　者：郭兴华[1] 安茂忠[1] 杨培霞[1] 苏彩娜[1] 李海先[1] 

机构地区：[1]哈尔滨工业大学化工学院,黑龙江哈尔滨150001

出　　处：《电镀与环保》2009年第5期16-20,共5页Electroplating & Pollution Control

摘　　要：采用KOH-Na2SiO3-Na2B4O7-Na2CO3环保型电解液体系,研究了电流密度对AZ 31B镁合金阳极氧化过程、氧化膜微观形貌、膜层厚度、氧化膜耐蚀性等的影响。结果表明:在恒电流阳极氧化过程中,根据电压-时间曲线,阳极氧化过程可分为电压快速升高阶段、电压缓慢升高阶段、电压相对稳定阶段。随着电流密度的增大,电压-时间曲线的斜率增大,电压明显增大,点火时间缩短,但对击穿电压影响不大;随着电流密度的增加,膜层致密性、厚度、耐蚀性都呈先增大后减小的趋势。当电流密度为1.5 A/dm2时,阳极氧化膜的致密性和耐蚀性最好。Effects of current density on the anodizing process, surface morphology, thickness and corrosion resistance of the anodized films of AZ 31 B magnesium alloy were studied by applying an environment-friendly electrolyte of KOH-Na2SiO3- Na2B4 O7-Na2CO3 system. The results show that according to the voltage-time curves, the anodizing process could be divided into three stages： fast increasing stage, slowly increasing stage and relatively stable stage in voltage. With the increasing of current density, slopes of the voltage-time curves increase, the voltage values increase remarkably, and the ignition time decreases, but the breakdown voltage has no apparent variation. The compactness, thickness, and corrosion protection of the anodized films all increase at first and then decrease with the increasing of current density. When the current density is at 1.5 A/dm^2 , the compactness and corrosion resistance of the anodized film are the best.

关 键 词：阳极氧化 电流密度 镁合金 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]