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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (6): 1255-1263    DOI: 10.11902/1005.4537.2022.300
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Research Progress on Corrosion and Protection of Corrosion-resistant Mg-Li Alloys
TIAN Guangyuan1, YAN Chengming1, YANG Zhihao1, WANG Junsheng1,2()
1.School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
2.Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China
Cite this article: 

TIAN Guangyuan, YAN Chengming, YANG Zhihao, WANG Junsheng. Research Progress on Corrosion and Protection of Corrosion-resistant Mg-Li Alloys. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1255-1263.

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Abstract  

Mg-Li alloys with high specific strength and stiffness are ideal metal structural engineering materials for aerospace due to their excellent weight reduction effect. However, their poor corrosion resistance severely limits the wide application in some service environments. Therefore, in order to meet the demand of application, it is still necessary to adjust and optimize the composition of corrosion resistant Mg-Li alloys and improve its preparation process in the future. The research status on corrosion mechanism and different types of surface protection methods (metallic coating, anodic oxidation, conductive-shielded polymer coating, and smart coating), as well as future applications of corrosion-resistant Mg-Li alloys were summarized in this paper. Meanwhile, the advantages and limitation of different types of corrosion protection methods were analyzed, and the future research directions of corrosion and protection for corrosion resistant Mg-Li alloys are discussed so that to provide new ideas for future development of higher corrosion-resistant Mg-Li alloys.

Key words:  Mg-Li alloy      corrosion      protection      smart coating      superhydrophobic     
Received:  28 September 2022      32134.14.1005.4537.2022.300
ZTFLH:  TG146.22  
Fund: National Natural Science Foundation of China(52073030);National Natural Science Foundation of China-Guangxi Joint Fund(U20A20276)
Corresponding Authors:  WANG Junsheng, E-mail: junsheng.wang@bit.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2022.300     OR     https://www.jcscp.org/EN/Y2023/V43/I6/1255

ConditionEcorr / Vvs SCEIcorrA·cm-2CR mm·a-1RpkΩ·cm2
H-2.221.02 ×10-327.200.122
AR-2.004.50 ×10-412.300.266
RA-2.183.54 ×10-50.941.864
Table 1  Summary of results from electrochemical polarization tests on LC41 alloy in SBF
Fig.1  Corrosion mechanism of Mg-8Li alloy in NaCl solution[11]
Fig.2  Schematic diagram of the formation of corrosion layer on the surface of Mg-Li alloy[13]: (a) HCP, (b) HCP+BCC, (c) BCC
Fig.3  SEM (a, c, e) and Ce mapping analysis images (b, d, f) of scratched epoxy coating containing Ce-MCM-22 immersed in 0.35%NaCl solution at different immersion times: (a, b) 1 h, (c, d) 40 h, (e, f) 120 h. (Note: the coating was peeled away from Mg-Li alloy for the scratched sample after 120 h immersion before scanning)[42]
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