工艺条件对镁合金微弧氧化的影响  

Effect of operating condition on micro-arc oxidation of magnesium alloys

作　　者：郭洪飞[1] 安茂忠[1] 霍慧彬[1] 徐莘[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2006年第6期616-621,共6页Materials Science and Technology

摘　　要：在含有Na2S iO3、NaF、甘油及KOH的电解液中以恒电流方式对AZ31B镁合金进行微弧氧化处理,研究了电解液组分、浓度、电流密度及氧化处理时间等对微弧氧化过程及膜层性能的影响.研究表明:随着电解质浓度的增加,起火时间、起火电压基本呈下降趋势,氧化膜厚度呈增长趋势;过量的NaF会抑制放电;甘油的存在可稳定电解液,抑制尖端放电,使膜层的厚度降低;电流密度的增加可以降低起火时间,增加氧化膜的厚度,对放电电压没有明显影响;随着氧化处理时间的延长,氧化膜的厚度不断增长.AZ31B magnesium alloys were treated by micro-arc oxidation at constant current in electrolyte containing Na2SiO3, NaF, glycerol and KOH. The effect of constituents and concentration of electrolyte, current density and treatment time on MAO process and coating property was investigated respectively. With the increasing of concentration of electrolyte, the ignition time and breakdown voltage decreased, and the coating thickness increased. With the increasing of NaF content, the spark phenomenon was restrained, and the coating thickness decreased with the increasing of glycerol which can stabilize the electrolyte. No direct relationship was established between applied current density and breakdown voltage. The coating thickness increased with the prolonging of MAO process.

关 键 词：微弧氧化 镁合金 陶瓷膜 

分 类 号：TG174.45[金属学及工艺—金属表面处理]