Effect of Rare Earth on Corrosion Products and Impedance Behavior of AZ91 Magnesium Alloy Under Dry-wet Cycles

被引：6
|
作者：
Zhao X. [1 ,2 ]
Jia R.-L. [1 ,2 ]
Zhou W.-G. [1 ]
Guo F. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot
[2] Key Laboratory for Thin Film and Coatings of Inner Mongolia Autonomous Region, Hohhot
来源：
Jia, Rui-Ling (jrl014014@163.com) | 1600年 / Beijing Institute of Aeronautical Materials (BIAM)卷 / 45期
关键词：
AZ91 Mg alloy; Corrosion; Dry-wet cycle; Electrochemical impedance spectroscopy(EIS); Rare earth;
D O I：
10.11868/j.issn.1001-4381.2016.000203
中图分类号：
学科分类号：
摘要：
The effect of mischmetal of lanthanum and cerium on the composition and structure of the corrosion products on the surface of AZ91 Mg alloy in deicing salt solution under dry-wet cycles was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The results show that the corrosion products of AZ91 Mg alloy without mischmetal addition (La, Ce) are mainly composed of Mg(OH)2, MgO, CaCO3 and Mg6Al2CO3(OH)16·4H2O; and (La, Ce)AlO3 can be found in the products of AZ91 with mischmetal addition, meanwhile dense layer occurs in the corrosion products. Electrochemical impedance spectroscopy (EIS) measurements show that the charge transfer resistance of AZ91 alloy with mischmetal addition tested in the same dry-wet cycles is much higher than that of AZ91 alloy, the addition of mischmetal helps to reduce the dispersing effect of impedance spectroscopy, indicating that the corrosion resistance of AZ91 Mg alloy and the stability of corrosion product films can be improved by mischmetal of La and Ce. © 2017, Journal of Materials Engineering. All right reserved.
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页码：41 / 50
页数：9
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