Corrosion fatigue behavior of epoxy-coated Mg–3Al–1Zn alloy in NaCl solution  

作　　者：Xiu-Li He Ying-Hui Wei Li-Feng Hou Zhi-Feng Yan Chun-Li Guo Peng-Ju Han 

机构地区：[1]College of Materials Science and Engineering, Taiyuan University of Technology [2]Department of Chemistry, Luliang College

出　　处：《Rare Metals》2014年第3期276-286,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51001079, 21201129, 51208333, and 51374151);Natural Science Foundation of Shanxi Province (No. 201101102002);the China Postdoctoral Science Foundation (No. 20100471586);the Doctoral Fund of Ministry of Education of China (No. 20091402110010)

摘　　要：The corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy was investigated in air and 3.5 wt%NaCl solution. Epoxy coating as a new method was used to improve the corrosion fatigue property of the material.Results show that the fatigue limit（FL） of the coated specimens is higher than that of the uncoated specimens in3.5 wt% NaCl solution because of the strengthening and blocking functions of the epoxy coating. The FL of the coated specimens in 3.5 wt% NaCl solution is as high as that in air. It implies that the coated specimens are not as sensitive to the environment as the magnesium alloy. The low tensile strength and the short elongation of the pure epoxy coating lead to that the fatigue crack of the coated specimen is always initiated from the epoxy-coating film Pores and pinholes accelerate the fatigue crack initiation process. Pinholes are caused by the corrosion reactions between the epoxy coating and the NaCl solution.The corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy was investigated in air and 3.5 wt%NaCl solution. Epoxy coating as a new method was used to improve the corrosion fatigue property of the material.Results show that the fatigue limit（FL） of the coated specimens is higher than that of the uncoated specimens in3.5 wt% NaCl solution because of the strengthening and blocking functions of the epoxy coating. The FL of the coated specimens in 3.5 wt% NaCl solution is as high as that in air. It implies that the coated specimens are not as sensitive to the environment as the magnesium alloy. The low tensile strength and the short elongation of the pure epoxy coating lead to that the fatigue crack of the coated specimen is always initiated from the epoxy-coating film Pores and pinholes accelerate the fatigue crack initiation process. Pinholes are caused by the corrosion reactions between the epoxy coating and the NaCl solution.

关 键 词：Epoxy coating Corrosion fatigue Magnesium alloy 3.5 wt% NaCl solution FatigueCrack initiation 

分 类 号：TG172[金属学及工艺—金属表面处理]