镁锂合金表面耐蚀微弧氧化膜的研究  

Study on Corrosion Resistance Coating Formed on Magnesium-Lithium Alloy by Micro-Arc Oxidation

作　　者：景晓燕 袁艺 于方 宋来文[2] 张密林 王涛[1] 朱果逸[2] 

机构地区：[1]哈尔滨工程大学超轻材料与表面技术教育部重点实验室,黑龙江哈尔滨150001 [2]中科院长春应用化学研究所,吉林长春130022

出　　处：《稀有金属材料与工程》2009年第7期1154-1157,共4页Rare Metal Materials and Engineering

基　　金：国家"863"基金(2006AA03Z510);哈尔滨市科技创新人才研究基金(2008RFQXG036);哈尔滨工程大学基础研究基金(HEUFT-07055)资助

摘　　要：利用微弧氧化技术在镁锂合金的表面成功制备了微弧氧化膜。利用SEM、XRD、XPS、动电位极化和电化学交流阻抗谱对微弧氧化膜结构、相组成以及耐蚀性能进行了研究。SEM观测结果表明,氧化膜层的结构是由疏松层和致密层组成的双层结构,微弧氧化膜表面存在大量直径约2～7μm的微孔。XRD和XPS分析表明,微弧氧化膜的主要相组成为方镁石氧化镁和无定形磷酸盐化合物。动电位极化曲线以及电化学交流阻抗谱分析表明,微弧氧化处理后镁锂合金的耐蚀性能得到显著提高。Micro-arc oxidation （MAO） coatings have been successfully prepared on Mg-Li alloys by micro-arc oxidation. The structure, phase composition and anti-corrosion behavior of MAO coatings are investigated by SEM, XRD, XPS, potentiodynamic polarization and electrochemical impedance spectroscopy （EIS）. SEM images indicate the MAO coatings possess two layers ＂dense＂ and ＂loose layer＂. Plenty of micropores exist on the surface of MAO coatings. The diameter of micropores ranges from 2 to 7 μm. XRD and XPS analysis reveal that MAO coatings are mainly composed of periclase MgO and amorphous phosphate compounds. Potentiodynamic polarization and electrochemical impedance spectroscopy results show that the corrosion resistance of Mg-Li alloys has been improved obviously after MAO treatment.

关 键 词：镁锂合金 微弧氧化膜 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]