Effect of Microstructure on Corrosion Resistance of a High-strength Ultralightweight Mg-Li Alloy

doi:10.11902/1005.4537.2023.025

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (1): 255-260 DOI: 10.11902/1005.4537.2023.025

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Effect of Microstructure on Corrosion Resistance of a High-strength Ultralightweight Mg-Li Alloy

XIE Yun¹, LIU Ting¹, WANG Wen¹, ZHOU Jialin¹, TANG Song²(

)

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Cite this article:

XIE Yun, LIU Ting, WANG Wen, ZHOU Jialin, TANG Song. Effect of Microstructure on Corrosion Resistance of a High-strength Ultralightweight Mg-Li Alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 255-260.

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Abstract

Mg-15Li-6Al alloy was prepared by vacuum induction melting and then the alloy was subjected to solution treatment plus air cooling or water cooling respectively. The phase constitution and microstructure of the alloys (as-cast, solution treatment plus air cooling or water cooling), were analyzed by means of X-ray diffraction analysis (XRD) and scanning electron microscope (SEM). In addition, the corrosion behavior of the three alloys was studied by gravimetric and electrochemical tests. The results show that the three-state alloys are all mainly composed of β-Li with a little of second phase AlLi, and the fractions of secondary AlLi precipitates in the alloys decrease in the following order: as-cast, solution treatment + air cooling and solution treatment + water cooling. The alloy after solution treatment plus water cooling is almost composed of single β-Li phase. On the contrary, the corrosion resistance of the three alloys follows the sequence: as-cast < solution treatment + air cooling < solution treatment + water cooling. Relative to the as-cast alloy, the free corrosion potential increases by 480 mV and the corrosion current density decreases by three orders of magnitude for the alloy solution subjected to solution treatment plus water cooling. The solution treatment makes more Al to dissolve back into β-Li, and subsequent fast cooling strongly suppresses the precipitation of AlLi. Therefore, the number of micro galvanic couple of AlLi and β-Li decreases, resulting in marked improvement of corrosion resistance.

Key words: Mg-Li alloys heat treatment corrosion resistance microstructure

Received: 08 February 2023 32134.14.1005.4537.2023.025

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(52101142);Natural Science Foundation of Jiangsu Province(BK20200503);Jiangxi Provincial Natural Science Foundation(20224BAB214018)

Corresponding Authors: TANG Song, E-mail: stang12s@alum.imr.ac.cn

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	XIE Yun
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https://www.jcscp.org/EN/10.11902/1005.4537.2023.025 OR https://www.jcscp.org/EN/Y2024/V44/I1/255

Fig.1 XRD patterns of different state LA156 alloys

Fig.2 Microstructures of different state LA156 alloys: (a) as-cast, (b) air cooling, (c) water cooling

Fig.3 Macroscopic morphologies of different state LA156 alloys before (a-c) and after (d-f) 40 h immersion in 3.5%NaCl solution: (a, d) as-cast, (b, e) air cooling, (c, f) water cooling

Fig.4 Localized morphologies of different state LA156 alloys after 40 h immersion in 3.5%NaCl solution: (a) as-cast, (b) air cooling, (c) water cooling

Fig.5 Corrosion rates of different state LA156 alloys in 3.5%NaCl solution

Fig.6 XRD patterns of different state LA156 alloys after 40 h immersion in 3.5%NaCl solution

Fig.7 Polarization curves of different state LA156 alloys in 3.5%NaCl solution

Table 1 Extrapolated data of polarization curves

Fig.8 Comparison of density and corrosion current density of water cooling LA156 with pure Mg and some Mg(-Li) alloys

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