Journal
METALS AND MATERIALS INTERNATIONAL
Volume 15, Issue 1, Pages 51-55Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-009-0051-6
Keywords
hot corrosion; lithium molten salt; electrolytic reduction; structural material
Funding
- Ministry of Education, Science and Technology of Korea
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The electrolytic reduction of a spent oxide fuel involves the liberation of the oxygen in a molten LiCl electrolyte, which is a chemically aggressive environment that is too corrosive for typical structural materials. Accordingly, it is essential to choose the optimum material for the process equipments such as the electroreducer and the salt purification vessel in the pyrochemical process. In this study, the corrosion behaviors of superalloys N-1, N-2 and N-3 in a molten LiCl-Li2O salt under an oxidizing atmosphere were investigated at 650 degrees C for 72 h to 216 h. Superalloy N-1 showed the highest corrosion resistance among the examined alloys. The corrosion products of superalloys N-1 and N-2 were NiO, Cr2O3, and NiCr2O4, while NiO, Cr2O3, LiAl2Cr3O8 were identified as the corrosion products of superalloy N-3. For superalloy N-1, its outer corrosion layer was more continuous, dense and adherent compared to those of N-2 and N-3.
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