电流密度对ZL108钨酸钠改性微弧氧化膜特性影响  

Effects of current density on characteristics of sodium tungstate modified micro-arc oxidation coatings on ZL108 alloy

作　　者：王平[1] 郭小阳[1] 梅雨堃 胡议文 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,材料科学与工程学院,四川成都610500

出　　处：《材料热处理学报》2014年第3期188-192,共5页Transactions of Materials and Heat Treatment

基　　金：四川省教育厅重点科研项目(12ZA293);西南石油大学校基金项目(2012XJZ015);油气藏地质及开发工程国家重点实验室(西南石油大学)项目(PLN1307)

摘　　要：在不同电流密度下制备了ZL108 Na2WO4改性微弧氧化膜,研究了电流密度对Na2WO4改性微弧氧化膜特性的影响。利用扫描电镜(SEM)观察氧化膜表面形貌,能谱仪(EDS)、X射线衍射仪(XRD)以及X射线光电子能谱(XPS)分别测试了氧化膜截面元素分布、相组成以及W的化合价,极化曲线测试了耐蚀性。结果表明,随电流密度增大,微弧氧化膜由致密变为多孔,微孔数量增加、尺寸变大,膜层增厚。膜层中W、O含量增加,Al含量下降。微弧氧化膜由γ-Al2O3、Al和Si 3个相组成,W元素在膜中主要以WO3形式存在。微弧氧化膜的耐蚀性随电流密度增加而提高。In order to investigate the effect of current density on characteristics of sodium tungstate modified microarc oxidation（MAO） coatings on ZL108 alloy, which was treated by using MAO in sodium tungstate electrolyte with different current density. Surface morphology, distribution of elements, valence of tungsten and phase component of the MAO coatings were analyzed by SEM, EDS analysis, XPS and XRD, respectively. The corrosion resistance of the MAO coatings was measured by polarization curve. The results show that diameter and amount of pores and thickness of the MAO coatings increases with increasing current density. The content of oxygen and tungsten element in the MAO coatings increase, and the content of aluminum declines with the increasing of current density. The MAO coatings are composed of γ-Al2O3 , A1 and Si phases. The tungsten exists in the micro-arc coatings as WO3. The corrosion resistance of the MAO coatings increase with the increasing of current density.

关 键 词：微弧氧化 电流密度 钨酸钠 ZL108合金 

分 类 号：TG174.45[金属学及工艺—金属表面处理]