Effect of YAl₂ Particles on the Corrosion Behavior of Mg⁻Li Matrix Composite in NaCl Solution

Zihan Chen; Chonggao Bao; Guoqing Wu; Yongxin Jian; Li Zhang

doi:10.3390/ma12030549

Effect of YAl₂ Particles on the Corrosion Behavior of Mg⁻Li Matrix Composite in NaCl Solution

Materials (Basel). 2019 Feb 12;12(3):549. doi: 10.3390/ma12030549.

Authors

Zihan Chen¹, Chonggao Bao², Guoqing Wu³, Yongxin Jian⁴, Li Zhang⁵

Affiliations

¹ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi Province, China. doyen_chen@stu.xjtu.edu.cn.
² State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi Province, China. cgbao@xjtu.edu.cn.
³ School of Materials Science and Engineering, Beihang University, Beijing 100191, China. guoqingwu@buaa.edu.cn.
⁴ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi Province, China. yxjian@xjtu.edu.cn.
⁵ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi Province, China. lily3113004001@stu.xjtu.edu.cn.

Abstract

The strength of Mg⁻Li alloy is greatly improved by the composite strengthening of intermetallic compound YAl₂ particles, but the low corrosion resistance of Mg⁻Li alloy is still the main factor that restricts the application of the alloy and its composites. In this paper, the effect of YAl₂ particles on the corrosion behavior of Mg⁻Li alloy was systematically investigated. The results showed that the corrosion resistance of YAl_2p/LA143 composite could be significantly improved, accounting for the formation of a transitional interface layer by adding YAl₂ particles. The diffusion of yttrium and aluminum atoms from YAl₂ particulates improved the stability of the surface film and enhanced the adhesion between the corrosion products and the substrate, which hindered further expansion of pitting.

Keywords: EIS; XPS; intermetallics; magnesium; metal matrix composites; polarization.

Abstract

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