Understanding a novel form of intergranular corrosion of stainless steel 316L exposed to molten LiCl-Li2O-Li

Moon, Jeremy; Phillips, William C; Chuirazzi, William C; Kane, Joshua J; Chidambaram, Dev

doi:10.1016/j.corsci.2024.111836

Title: Understanding a novel form of intergranular corrosion of stainless steel 316L exposed to molten LiCl-Li₂O-Li

Journal Article · 06 January 2024 · Corrosion Science

DOI: https://doi.org/10.1016/j.corsci.2024.111836 · OSTI ID:2337807

Moon, Jeremy ^[1];

^[2]; Chuirazzi, William C ^[2];

^[2]; Chidambaram, Dev ^[1]

University of Nevada, Reno, NV (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

We report stainless steel 316 L exposed to LiCl-Li2O molten salt containing Li metal for 500 and 1000 h experiences deep intergranular attack and bulk void formation. This degradation is due to a synergistic corrosion mechanism, different than other forms of molten salt corrosion, where Cr and Mn oxides and carbides form along grain boundaries and are dissolved by Li metal. Synchrotron transmission X-ray microscopy 3D imaging is used to show corrosion morphology and Cr enrichment and depletion in a novel format that has not previously been used for bulk corrosion samples.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Nuclear Regulatory Commission (USNRC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC07-05ID14517; NE0008236; SC0012704

OSTI ID:: 2337807

Report Number(s):: INL/JOU--21-61410-Revision-0

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Journal Issue: - Vol. 228; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Understanding a novel form of intergranular corrosion of stainless steel 316L exposed to molten LiCl-Li₂O-Li