Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant
Abstract
Corrosion of structural alloys in fluoride salt cooled high temperature reactors (FHRs) is affected by the presence of carbon. The stability of the carbides of alloying elements augments their corrosion, however the same property can be useful if these stable carbides are used to protect materials. Exposure tests of pure elements Cr, Fe, Ni, W, and Mo in graphite crucibles at 700 °C were conducted in molten FLiNaK salt for 100 h. Carbide particles were detected on the surfaces of Cr, Mo, and W samples after exposure. The ranking of these elements, from least to greatest corrosion resistance by mass loss per unit area was Cr < Fe < W < Mo < Ni. The stability of chromium carbides was further investigated using chromium samples which were pre-carburized in a reducing hydrocarbon environment at 800 °C prior to exposure tests in molten FLiNaK. In conclusion, the chromium carbide layer produced by pre-carburization was resistant to attack by molten fluoride and slowed corrosion of the underlying chromium metal.
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Publication Date:
- Research Org.:
- Georgia Institute of Technology, Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE
- OSTI Identifier:
- 1613880
- Alternate Identifier(s):
- OSTI ID: 1582701
- Grant/Contract Number:
- NE0008306
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Annals of Nuclear Energy
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: C; Journal ID: ISSN 0306-4549
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 22 GENERAL STUDIES OF NUCLEAR REACTORS; Nuclear Science & Technology; FHR; High temperature corrosion; Molten salt; Carburization; FLiNaK
Citation Formats
Chan, Kevin J., Ambrecht, Rebecca J., Luong, Julie M., Choi, Won Tae, and Singh, Preet M. Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant. United States: N. p., 2018.
Web. doi:10.1016/j.anucene.2018.05.013.
Chan, Kevin J., Ambrecht, Rebecca J., Luong, Julie M., Choi, Won Tae, & Singh, Preet M. Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant. United States. https://doi.org/10.1016/j.anucene.2018.05.013
Chan, Kevin J., Ambrecht, Rebecca J., Luong, Julie M., Choi, Won Tae, and Singh, Preet M. Wed .
"Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant". United States. https://doi.org/10.1016/j.anucene.2018.05.013. https://www.osti.gov/servlets/purl/1613880.
@article{osti_1613880,
title = {Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant},
author = {Chan, Kevin J. and Ambrecht, Rebecca J. and Luong, Julie M. and Choi, Won Tae and Singh, Preet M.},
abstractNote = {Corrosion of structural alloys in fluoride salt cooled high temperature reactors (FHRs) is affected by the presence of carbon. The stability of the carbides of alloying elements augments their corrosion, however the same property can be useful if these stable carbides are used to protect materials. Exposure tests of pure elements Cr, Fe, Ni, W, and Mo in graphite crucibles at 700 °C were conducted in molten FLiNaK salt for 100 h. Carbide particles were detected on the surfaces of Cr, Mo, and W samples after exposure. The ranking of these elements, from least to greatest corrosion resistance by mass loss per unit area was Cr < Fe < W < Mo < Ni. The stability of chromium carbides was further investigated using chromium samples which were pre-carburized in a reducing hydrocarbon environment at 800 °C prior to exposure tests in molten FLiNaK. In conclusion, the chromium carbide layer produced by pre-carburization was resistant to attack by molten fluoride and slowed corrosion of the underlying chromium metal.},
doi = {10.1016/j.anucene.2018.05.013},
journal = {Annals of Nuclear Energy},
number = C,
volume = 120,
place = {United States},
year = {Wed Jun 06 00:00:00 EDT 2018},
month = {Wed Jun 06 00:00:00 EDT 2018}
}
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