Corrosion Behavior of Molybdenum in LiF-LiCl-LiBr-Li Molten Salt at 500 ℃

doi:10.11902/1005.4537.2021.011

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 67-72 DOI: 10.11902/1005.4537.2021.011

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Corrosion Behavior of Molybdenum in LiF-LiCl-LiBr-Li Molten Salt at 500 ℃

ZHANG Jian(

), HUANG Jin, XU Jiapeng, LUO Guoqiang, SHEN Qiang

State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

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Abstract

Corrosion behavior of Mo, prepared by plasma activation sintering technique, in molten LiF-LiCl-LiBr-Li at 500 ℃ was examined by means of immersion test, XRD, FE-SEM and EDS. The results show that the sinttered Mo have good corrosion resistance in LiF-LiCl-LiBr molten salt, but it will be corroded by residual impurities forming corrosion products of MoO₂ and MoS₂. Furthermore, the addition of metallic Li into the molten salt will induce the grain boundary corrosion of Mo, where rich in O element, thereby lead to separation of Mo grains and severe corrosion of Mo. Meanwhile, the corrosion products changed from MoO₂ to Li₂CO₃.

Key words: lithium molten salt molybdenum corrosion behavior corrosion mechanism metallic Li

Received: 15 January 2021

ZTFLH:

TG174

Fund: National Key R&D Program of China(2018YFB0905600)

Corresponding Authors: ZHANG Jian E-mail: zhangjian178@whut.edu.cn

About author: ZHANG Jian, E-mail: zhangjian178@whut.edu.cn

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Cite this article:

ZHANG Jian, HUANG Jin, XU Jiapeng, LUO Guoqiang, SHEN Qiang. Corrosion Behavior of Molybdenum in LiF-LiCl-LiBr-Li Molten Salt at 500 ℃. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 67-72.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.011 OR https://www.jcscp.org/EN/Y2022/V42/I1/67

Fig.1 Mass change of Mo during corrosion in LiF-LiCl-LiBr molten salt for different time

Fig.2 XRD patterns of Mo after corrosion in LiF-LiCl-LiBr molten salt for different time

Fig.3 SEM images of Mo after corrosion in LiF-LiCl-LiBr molten salt for 0 h (a), 6 h (b), 12 h (c), 50 h (d), 150 h (e) and 300 h (f)

Fig.4 EDS mappings of Mo (a) and O (b) on the surface of Mo after corrosion in LiF-LiCl-LiBr for 150 h and the contents of Mo and O after corrosion for different time (c)

Fig.5 Cross-sectional images of Mo corroded in LiF-LiCl-LiBr for 6 h (a), 12 h (b), 50 h (c), 150 h (d), 300 h (e)

Fig.6 Mass change of Mo during corrosion for 150 h in LiF-LiCl-LiBr molten salt with the different contents of Li

Fig.7 XRD patterns of Mo corroded for 150 h in LiF-LiCl-LiBr with the different contents of Li

Fig.8 Surface (a, c, e) and cross-sectional (b, d, f) SEM images of Mo corroded in LiF-LiCl-LiBr molten salt with the additions of 0.1% (a, d), 0.25% (b, e) and 1% (c, f) Li

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