AZ91D镁合金表面渗锌渗层组织及其性能研究  

Investigation on microstructures and properties of AZ91D magnesium alloy surface zinced layer

作　　者：林文光[1] 姚军[1] 毛广雷[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《轻合金加工技术》2009年第6期46-48,56,共4页Light Alloy Fabrication Technology

摘　　要：采用Zn与Al2O3固体混合粉末对AZ91D镁合金表面进行热扩渗处理,对渗层进行金相组织形貌、化学成分、物相组成分析以及对基体材料、扩渗试样进行盐雾腐蚀对比试验。结果表明,在400℃恒温热扩渗8h条件下,扩渗层与基体材料表面之间能够形成由均匀细密的共晶态组织构成的渗层,厚度约为0·7mm左右,扩渗层主要合金相由Mg7Zn3与Mg-Zn化合物共同构成。同时盐雾腐蚀试验结果表明,形成的扩渗层组织在一定程度上提高了AZ91D镁合金表面的耐腐蚀性能。AZ91D magnesium alloy by solid diffusion Zn and Al2O3 treatment is conducted. The microstructure, elementary composition, XRD image and corrosion resistance ability of the alloyed layer are investigated. The results show that the alloyed layer is of uniform and fine crystals. Under the state in 400℃, 8 h, the thickness of diffusion layer is about 0.7 mm. Through elementary com- position and XRD image, it was shown that the alloyed layer was mainly composed of Mg-Zn intermetaUic compoands Mg7 Zn3 and Mg-Zn solid solution. The corrosion resistance experiment reveals the alloyed layer has better corrosion resistance than the substrate AZ91D magnesium alloy.

关 键 词：AZ91D镁合金 扩渗层 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]