AZ91D镁合金外加电场下自封孔微弧氧化膜层微观形貌及耐蚀性  

Morphology and Corrosion Resistance of Self-sealing Micro-arc Oxidation Coatings of AZ91D Magnesium Alloys under External Electric Field

作　　者：陈宏[1] 黄杰[1] 陈永楠[1] 郝建民[1] 丁业立[2] 

机构地区：[1]长安大学,陕西西安710064 [2]山东交通学院,山东威海264200

出　　处：《稀有金属材料与工程》2017年第10期3098-3104,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51301022);陕西省自然科学基金(2016JQ5032)

摘　　要：采用外加电场微弧氧化技术实现自封孔,并研究了不同孔结构膜层的耐蚀性能;讨论了封孔过程中胶体运动-电位-孔结构之间的规律性关系,评价了自封孔后膜层腐蚀性能。结果表明:膜层中的多孔结构是腐蚀介质的通道,自封孔后耐蚀性能提高。此外,耐蚀性与孔隙率及封孔填充物的成分和形态具有极大的相关性。通过调整外加电场强度和时间可以实现对自封孔的调控,从而改善耐蚀性能。The corrosion resistance of micro-arc oxidation coatings was improved by self-sealing microstructure through an applied electric field. The relationship between the porous structure of the oxidation coatings and corrosion was investigated by microstructure analysis. Meanwhile, regularity relations of colloid motion-potential-porous structure during the sealing process was discussed and the corrosion resistance of the coatings after self-sealing was evaluated by electrochemical corrosion tests. The results show that the porous structure of the coatings is the channel of corrosive medium, and corrosion resistance can be improved by the self-sealing. In addition, corrosion resistance exhibits significant dependence on porosity, composition and morphology of sealing. The corrosion resistance can be improved by self-sealing microstructure obtained by applied electric field.

关 键 词：镁合金 微弧氧化 耐蚀性 自封孔 

分 类 号：TG174.4[金属学及工艺—金属表面处理]