氢氧化钾对镁合金微弧氧化的影响  

Influence of KOH on Micro Arc Oxidation Process of Magnesium Alloy

作　　者：梁军[1,2] 郭宝刚[1,2] 田军[1] 刘惠文[1] 徐洮[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室 [2]中国科学院研究生院,北京100039

出　　处：《材料保护》2005年第4期6-8,1,共3页Materials Protection

基　　金：国家自然科学基金资助项目(50323007)(50271080);国家863项目(2003AA305670)

摘　　要：过去,对碱金属氢氧化物影响硅酸盐溶液体系的研究不多。在KOH溶液和Na2SiO3KOH溶液中进行了镁合金微弧氧化试验,研究了KOH对镁合金微弧氧化过程的影响。结果表明,电解液仅为KOH时,镁合金表面不发生成膜反应,而是发生电化学溶解;在Na2SiO3KOH溶液中,KOH对微弧氧化成膜反应并无贡献,它的加入可以有效地增加溶液的电导率,降低击穿电压,从而影响微弧氧化膜的生长速率。With a view to the absence of the detailed research report about the effect of alkali metal hydroxide on the microarc oxidation (MAO) of magnesium alloy in a silicate solution system, the MAO of Mg alloy was performed in KOH and Na_(2)SiO_(3)KOH solutions, respectively. Thus the influence of KOH on the MAO process of the Mg alloy was investigated. The results showed that the Mg alloy subject to the MAO in the electrolyte solution containing KOH alone experienced no oxide film formation reaction but electrochemical dissolution. Moreover, KOH included in the Na_(2)SiO_(3) electrolyte solution had no contribution to the filmforming reaction of the MAO of Mg alloy, but it contributed to effectively increase the conductivity of the electrolyte solution and reduce the breakdown voltage, which in turn led to a change in the growth rate of the MAO coating.

关 键 词：微弧氧化 镁合金 氢氧化钾 硅酸盐 

分 类 号：TG174.451[金属学及工艺—金属表面处理]