基于阳极极化曲线的预测镁合金微弧氧化起弧特性的新方法  

A new method on predicting arc-initiating of micro-arc oxidation on magnesium alloy by anodic polarization curve

作　　者：王晓波[1] 田修波[1] 巩春志[1] 杨士勤[1] Paul K Chu 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]Department of Physics and Materials Science,City University of Hong Kong,hongkong000852

出　　处：《材料热处理学报》2012年第7期127-131,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(10975041)

摘　　要：提出了一种以镁合阳极极化曲线来判断微弧氧化起弧难易的新方法。在不同的电解液中,测试了镁合金的阳极极化曲线及微弧氧化的起弧特性。结果表明,起弧电压首先与其在对应电解液中进行阳极极化时形成的钝化膜的稳定性有关:膜层越稳定,即阳极极化曲线上钝化区宽度越宽,则在相应的电解液中微弧氧化起弧电压越低;当钝化区间宽度相近时,则在钝化区间后期极化电流越小,起弧电压越低。A new method on predicting arc-initiating of micro-arc oxidation on magnesium alloy by anodic polarization curve was proposed. Anodic polarization behavior and discharge characteristic were tested in different solutions. The results show that arcing voltage is much dependent on the stability of passivating films formed during anodic polarization process. The arcing voltage is higher with a larger width of passivation region of the polarization curve. When the stability of passivating films is at about the same level, the arcing voltage becomes lower in the solution possessing a smaller polarization current at the later section of passivation curves.

关 键 词：镁合金 微弧氧化 阳极极化行为 起弧特性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]