Effects of rare earths on corrosion behavior of AZ91 Mg alloy

被引：0
|
作者：
Fu X.-Y. [1 ]
Jia R.-L. [1 ,2 ]
Zhang G.-L. [1 ]
Li D. [1 ]
Ma W. [1 ,2 ]
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：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 07期
基金：
中国国家自然科学基金;
关键词：
AZ91 Mg alloy; Corrosion; Electrochemistry; Microstructure; Rare earth;
D O I：
10.11817/j.ysxb.1004.0609.2021-39759
中图分类号：
学科分类号：
摘要：
0.3%, 0.9% (mass fraction) rare earth Y and 0.4%, 1.0% (La, Ce) mixed rare earth were added to the AZ91 Mg alloy, respectively. Scanning electron microscopy (SEM), scanning Kelvin probe force microscopy (SKPFM) and electrochemical testing techniques were used to study the corrosion behavior of Mg alloy. X-ray diffraction (XRD) and photoelectron spectroscope (XPS) were used to determine the composition and structure of the corrosion product film. It was clarified that the influence of different types and contents of rare earth on the corrosion behavior of AZ91 Mg alloy. The results show that both rare earth elements can reduce the corrosion rate and improve the corrosion resistance of AZ91 Mg alloy. The effect of different types of rare earth on corrosion behavior of AZ91 Mg alloy depends not only on the potential difference between the precipitated phase and the matrix, but also on the influence mechanism of rare earth on the microstructure and surface film of Mg alloy. Rare earth La participates in the formation of corrosion products during the corrosion process, which increases the integrity of the surface film, but the passivation ability of the surface film is not as good as the passivation effect produced by the Y-containing Mg alloy. Rare earth Y reduces the mass fraction of β-Mg17Al12 phase in the alloy and weakens its micro-galvanic corrosion effect. The role of rare earth Y in improving the corrosion resistance is more obvious than that of (La, Ce) mixed rare earth. The corrosion rate of AZ91 Mg alloy with 0.9%Y addition is lower than that of Mg alloy containing 0.3%Y. The corrosion resistance of Mg alloy with 0.4% (La, Ce) mixed rare earth is similar to that of Mg alloy with 1.0% (La, Ce). © 2021, Science Press. All right reserved.
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页码：1798 / 1808
页数：10
相关论文
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  • [1] DENG Yong-he, Research status and development trend of rare earth magnesium alloy, Rare Earth, 30, 1, pp. 76-79, (2009)
  • [2] LIU Peng, JIANG Hai-tao, DUAN Xiao-ge, Et al., Effects of yttrium(Y) and cerium(Ce) on microstructure and stretch formability of hot rolled Mg-1.5Zn magnesium sheet at room temperature, Journal of Materials Engineering, 42, 12, pp. 1-10, (2014)
  • [3] JUNG I H, SANJARI M D, KIM J H, Et al., Role of RE in the deformation and recrystallisation of Mg alloy and a new alloy design concept for Mg-RE alloys, Scripta Materialia, 102, pp. 1-6, (2015)
  • [4] ZENG Xiao-qin, SHI Xiao-ying, Strengthening and toughening design and development of Mg rare earth alloy, Journal of Aeronautical Materials, 37, 1, pp. 18-25, (2017)
  • [5] MAHMUDI R, KAABIRIAN F, NEMATOLLAHI Z., Microstructural stability and high-temperature mechanical properties of AZ91 and AZ91+2RE magnesium alloys, Material and Design, 32, 5, pp. 2583-2589, (2011)
  • [6] BUZOLIN R H, MOHEDANO M, MENDIS C L, Et al., As cast microstructures on the mechanical and corrosion behavior of ZK40 modified with Gd and Nd additions, Materials Science and Engineering A, 682, pp. 238-247, (2017)
  • [7] ZHOU X H, HUANG Y W, WEI Z L, Et al., Improvement of corrosion resistance of AZ91D magnesium alloy by holmium addition, Corrosion Science, 48, 12, pp. 4223-4233, (2011)
  • [8] WU Guo-hua, FAN Yu, ZHAI Chun-quan, Et al., Effect of La on the corrosion resistance of AZ91D magnesium alloy in NaCl aqueous solution, Acta Metallurgica Sinica, 44, 10, pp. 1247-1252, (2008)
  • [9] ZHONG Li-ying, LIU Wen-juan, CAO Fa-he, Et al., Effect of corrosion behavior of AZ91 magnesium alloy with rare earth cerium and lanthanum, Corrosion Science and Protection Technology, 21, 2, pp. 91-93, (2009)
  • [10] LUO T J, YANG Y S., Corrosion properties and corrosion evolution of as-cast AZ91 alloy with rare earth yttrium, Materials and Design, 32, 10, pp. 5043-5048, (2011)
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