AZ31D镁合金固溶处理组织的耐蚀性

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马伯江， 李冲， 朱华东

（青岛科技大学 机电工程学院，山东 青岛 266061）

摘要： 用金相显微镜（OM）、扫描电镜（SEM）、能量分散谱仪（EDS）和X射线衍射仪（XRD）研究了AZ31D镁合金铸态和固溶组织的特征。为了揭示其腐蚀特征和机理，在NaCl溶液中进行了浸泡试验和极化腐蚀试验。结果显示：由于铸态组织成分不均匀和第二相晶界集中析出，在NaCl溶液中形成了梅花状腐蚀花纹；固溶组织在NaCl溶液中虽具点蚀特征，但耐蚀性仍优于铸态组织。

关键词：   AZ31D镁合金； 铸态； 固溶处理； 耐蚀性； NaCl溶液

中图分类号：  TG 146.2文献标志码： A

Corrosion Resistance of Solutiontreated AZ31D Magnesium Alloy

MA Bojiang, LI Chong, ZHU Huadong

（College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China）

Abstract: Theas-cast AZ31D magnesium alloy and its solution-treated microstructure were examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray Diffraction (XRD). The immersion testing of AZ31D magnesium alloys exposed to NaCl solution and electroche-mical measurement were carried out to seek their corrosion characteristics and corrosion mechanisms. The results show that clubs-like patterns form on the surface of the as-cast sample in NaCl solution on account of uneven composition and the second phase precipitation at grain boundary; although pitting corrosion may form on the surface of the solution-treated sample, the self-corrosion current density of the solution-treated sample is far lower than that of the as-cast one in mass ratio of  3.5% NaCl solution saturated with Mg(OH)2.

Key words: AZ31D; as-cast; solution treatment; corrosion resistance; NaCl solution

收稿日期：    20150817

作者简介： 马伯江(1968—)，男，副教授.

文章编号： 16726987（2016）05051205； DOI： 10.16351/j.16726987.2016.05.008