About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Voids Observed during Molten Salt Corrosion: Kirkendall or Not? |
Author(s) |
Weiyue Zhou, Miaomiao Jin, Yang Yang, Michael P Short |
On-Site Speaker (Planned) |
Weiyue Zhou |
Abstract Scope |
Corrosion of Cr-bearing structural metals in molten salts proceeds mainly via selective leaching of Cr. Upon removing the same amount of Cr atoms, the resulting corrosion morphologies can be entirely different depending on the alloy and conditions. Historically corrosion in these systems was attributed to Kirkendall effects, because the resulting voids looked semi-spherical and disconnected. Therefore, the void space was considered internal and isolated, resulting from unbalanced diffusion. No counter-argument was proposed, despite difficulties in explaining intergranular void spaces and significant variation of morphology. However, our recent experimental results exclusively show the existence of the salt in the void space, proving their connectivity. Such percolating voids cannot be obtained solely by unbalanced fluxes. The breaking down of the salt-solid interface pushes us to reconsider the validity of interpreting molten salt corrosion morphologies as Kirkendall voids, calling for a re-examination of past molten salt corrosion experiments. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Environmental Effects, Characterization |