Abstract
The extruded Mg-6Li-4Zn-xMn (x = 0, 0.4, 0.8, 1.2 wt%) alloys were prepared, and the microstructure of the test alloys was investigated by optical microscopy, scanning electron microscopy and transmission electron microscopy. The corrosion properties were determined by electrochemical measurements and immersion measurements in 3.5% NaCl solution. The results indicate that the extruded Mg-6Li-4Zn-xMn alloys are mainly composed of α-Mg phase, β-Li phase, Mn precipitates and some intermetallic compounds (MgLi2Zn). With the addition of Mn, stable corrosion products were formed on the surface of the test alloy, which can effectively inhibit further corrosion progress and improve the corrosion resistance. Mg-6Li-4Zn-1.2Mn alloy exhibits the best corrosion resistance, attributed to grain refinement, the improvement of the stability of corrosion product film and uniform distribution of fine second phases.
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0700403), the Chongqing Research Program of Basic Research and Frontier Technology (Nos. cstc2019jcyj-msxmX0306 and cstc2019jcjy-msxmX0539), the National Natural Science Foundation of China (No. 52171104), the fundamental Research funds for Central Universities (No. 2021CDJJMRH-001), the 111 Project (No. B16007) by the Ministry of Education and the State Administration of Foreign Experts Affairs of China.
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Li, M., Qin, Z., Yang, Y. et al. Microstructure and Corrosion Properties of Duplex-Structured Extruded Mg-6Li-4Zn-xMn Alloys. Acta Metall. Sin. (Engl. Lett.) 35, 867–878 (2022). https://doi.org/10.1007/s40195-022-01377-8
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DOI: https://doi.org/10.1007/s40195-022-01377-8