Characterization of Fe and Cr Dissolution and Reaction Product Formation in Molten Chloride Salts With and Without Impurities

Pint, Bruce A.; Su, Yi Feng; Sulejmanovic, Dino; Pillai, Rishi

doi:10.1080/09603409.2023.2205754

Characterization of Fe and Cr Dissolution and Reaction Product Formation in Molten Chloride Salts With and Without Impurities

Journal Article · Mon May 01 00:00:00 EDT 2023 · Materials at High Temperatures

DOI:https://doi.org/10.1080/09603409.2023.2205754· OSTI ID:1986235

^[1]; Su, Yi Feng ^[1]; Sulejmanovic, Dino ^[1]; ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

There is considerable interest in molten chloride salts for several applications including thermal storage and next-generation molten salt reactors (MSRs). Several studies have concluded that Cl salts are highly corrosive to structural materials. Using Oak Ridge National Laboratory’s established methodology, Cl salt compatibility was assessed for candidate Ni-based alloys 230, 600 and 740 H at 600°–800°C in static welded capsules and in flowing thermal convection loop (TCL) salt experiments. Simply drying commercial Cl salt at 550°–650°C and adding~0.05 wt.%Mg was able to produce small specimen mass changes and limited surface attack after 100–1000 h exposures. Intentional additions of H₂O, NiCl₂ and undried salt were used to better understand the role of impurities and achieve the>50 µm levels of attack reported in other studies. Further, characterisation of Cr depletion and oxide formation in conjunction with pre- and post-test salt chemistry measurements are being used to understand salt compatibility of structural materials.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Office of SBIR/STTR Programs (SBIR/STTR)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1986235

Journal Information:: Materials at High Temperatures, Journal Name: Materials at High Temperatures Journal Issue: 4 Vol. 40; ISSN 0960-3409

Publisher:: Maney PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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