Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 129, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2021.107087
Keywords
Mg-Li alloy; Surface film; Corrosion; Electrochemical; Raman spectroscopy
Categories
Funding
- National Natural Science Foundation of China [51901047]
- Basic and Applied Basic Research Fund of Guangdong Province of China [2021A1515010660]
- Guangzhou Science and Technology Plan Project [202102021101]
- National College Students Innovation and Entrepreneurship Training Program [xj202111845609]
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The corrosion behavior of alpha-Mg and beta-Li phases in a duplex Mg-8Li alloy was investigated in this study. Results showed that the alpha-Mg phase is more prone to corrosion, while the beta-Li phase has a protective surface film and exhibits intergranular corrosion.
The corrosion behavior of alpha-Mg and beta-Li phases in a duplex Mg-8Li (wt. %) alloy is investigated in this work. The results reveal that the Mg-8Li alloy has a eutectic structure and is composed of equivalent alpha-Mg and beta-Li phases. Corrosion preferentially propagates toward the alpha-Mg phase following initial corrosion at the alpha-Mg/beta-Li interface. The surface of the beta-Li phase is eventually destroyed after a longer immersion time. Meanwhile, the beta-Li phase shows intergranular corrosion, while transgranular corrosion filaments can be seen in the alpha-Mg phase. Unlike the alpha-Mg phase, the local potential distribution on the polarization plot of the beta-Li phase indicates that the surface film provides excellent protection, which is also confirmed by the results of Raman spectroscopy.
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