负向脉宽对Mg-Gd-Y合金微弧氧化膜致密性的影响  

Effect of Negative Pulse Width on Compactness of Plasma Electrolytic Oxidation Coatings on Mg-Gd-Y Alloy

作　　者：郭泉忠[1] 杜克勤[1] 朱秀荣[2] 王荣[2] 徐永东[2] 王福会[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016 [2]中国兵器科学研究院宁波分院,宁波315103

出　　处：《腐蚀科学与防护技术》2013年第2期89-94,共6页Corrosion Science and Protection Technology

基　　金：材料基础与应用技术重点项目(A0920110028);国家科技支撑计划(2011BAE22B05)资助

摘　　要：通过在特定的电参数下改变负向脉宽,在Mg-Gd-Y合金表面制备了不同的微弧氧化膜。利用扫描电镜和电化学方法研究氧化膜的显微组织和电化学行为。结果表明:负向脉宽对于微弧氧化膜的致密性具有重要影响,适当的负向脉宽可以有效地提高膜层致密性,而稍低或者过高的负向脉宽都会降低氧化膜的致密性,从而降低涂层的耐腐蚀性。The effect of negative pulse width of asymmetric bipolar pulse on the compactness of plasma electrolytic oxidation （PEO） coating on Mg-Gd-Y alloy is not yet revealed nowadays. Here, PEO coatings on Mg-Gd-Y alloy were prepared by means of bipolar pulse whose negative pulse width was changed within a desired range. The microstructure and corrosion performance of the coatings were examined by scanning electron microscope （SEM） and electrochemical measure- ments respectively. The results show that negative pulse width plays an important role on compact- ness of PEO coatings; and with negative pulse width within a suitable range the compactness of coatings can be surely enhanced, as a sequence, the corrosion resistance of the coatings is evidently increased.

关 键 词：镁合金 微弧氧化 负向脉宽 电化学阻抗谱 致密性 

分 类 号：TG174[金属学及工艺—金属表面处理]