PDF全文下载:2016050512
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 Solutiontreated 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: 20150817
作者简介: 马伯江(1968—),男,副教授.
文章编号: 16726987(2016)05051205; DOI: 10.16351/j.16726987.2016.05.008