Carburization effects on the corrosion of Cr, Fe, Ni, W, and Mo in fluoride-salt cooled high temperature reactor (FHR) coolant
- Georgia Inst. of Technology, Atlanta, GA (United States)
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.
- Research Organization:
- Georgia Institute of Technology, Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE
- Grant/Contract Number:
- NE0008306
- OSTI ID:
- 1613880
- Alternate ID(s):
- OSTI ID: 1582701
- Journal Information:
- Annals of Nuclear Energy, Vol. 120, Issue C; ISSN 0306-4549
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Liquid Salts as Media for Process Heat Transfer from VHTR's: Forced Convective Channel Flow Thermal Hydraulics, Materials, and Coating
Development of Corrosion Resistant Coatings for Structural Materials for Liquid Fueled Molten Salts Reactors Applications (Final Report)