About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Materials and Chemistry for Molten Salt Systems
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Presentation Title |
Corrosion and Dealloying Phenomena of Binary Ni-Cr Alloys in Molten FLiNaK Salts |
Author(s) |
Ho Lun Chan, Elena Romanovskaia, Valentin Romanovski, Minsung Hong, Peter Hosemann, John Scully |
On-Site Speaker (Planned) |
Ho Lun Chan |
Abstract Scope |
In molten fluoride salts, the preferential leaching of chromium or dealloying through grain boundary migration is a prevalent phenomenon that has been observed in many materials system including Ni-Cr alloys. Dealloying was primarily discussed in the context of microstructural attributes; and post-mortem characterization analyses. For instances, the selective leaching of alloying elements, corrosion regime, surface and bulk diffusion kinetics and coarsening of dealloyed layers are all dependent upon electrochemical potential, physical conditions and the environment which regulate these diverse processes such as element oxidation relative to Nernst potentials, surface diffusion and the resulting corrosion morphology. In this work, electrochemical dealloying of binary Ni-Cr alloys (Ni5Cr, Ni10Cr, Ni20Cr, wt% or at%) was studied in molten LiF-NaF-KF eutectic salt at 600°C. A series of electrochemical methods, including linear sweep voltammetry and chronopotentiometry , were performed on these materials in FLiNaK salts with and without the controlled additions of NiF2 and CrF3 salts. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Other, |