Abstract
This work utilizes electron energy loss spectroscopy (EELS) to identify oxidation state of alloying elements in Ni-based alloys after exposure to molten chloride salt systems. Pure Ni and Ni-20Cr model alloy were corroded in molten ZnCl2 and KCl-MgCl2 under argon atmosphere at various temperatures. Oxidation states of Cr (Cr3+) and Ni (Ni2+) in the molten salt after corrosion were determined by monitoring changes in the L2,3 edges of corresponding EELS spectra. Oxidation state mapping technique using principal component analysis and multiple linear least squares fitting in HyperSpy Python package was developed.
| Original language | English |
|---|---|
| Article number | 113790 |
| Journal | Scripta Materialia |
| Volume | 197 |
| DOIs | |
| State | Published - May 2021 |
Funding
This work was supported as part of the Molten Salts in Extreme Environments Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science. Brookhaven National Laboratory, Idaho National Laboratory, and Oak Ridge National Laboratory are operated under DOE contracts DESC0012704, DE-AC07-05ID14517, and DE-AC05-00OR22725, respectively. The authors also acknowledge the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, for use of the resources as part of Nuclear Science User Facilities. This research used resources of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors thank Megha Dubey, Jatuporn Burns, Yaqiao Wu, and Kristi Moser-McIntire at the Center for Advanced Energy Studies, and Miles Cook, Jayson Bush, Jeffery Bailey, and JoAnn Merrill at Idaho National Laboratory for their invaluable assistance. This work was supported as part of the Molten Salts in Extreme Environments Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science. Brookhaven National Laboratory, Idaho National Laboratory, and Oak Ridge National Laboratory are operated under DOE contracts DESC0012704, DE-AC07-05ID14517, and DE-AC05-00OR22725, respectively. The authors also acknowledge the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, for use of the resources as part of Nuclear Science User Facilities. This research used resources of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors thank Megha Dubey, Jatuporn Burns, Yaqiao Wu, and Kristi Moser-McIntire at the Center for Advanced Energy Studies, and Miles Cook, Jayson Bush, Jeffery Bailey, and JoAnn Merrill at Idaho National Laboratory for their invaluable assistance.
| Funders | Funder number |
|---|---|
| Molten Salts in Extreme Environments Energy Frontier Research Center | |
| U.S. Department of Energy | DE-AC05-00OR22725, DE-AC07-05ID14517, DESC0012704 |
| U.S. Department of Energy | |
| Office of Science | |
| Office of Nuclear Energy | DE-AC07-051D14517 |
| Office of Nuclear Energy | |
| Oak Ridge National Laboratory | |
| Brookhaven National Laboratory | DE-SC0012704 |
| Brookhaven National Laboratory |
Keywords
- Electron energy loss spectroscopy
- Molten salt corrosion
- Multiple linear least squares fitting
- Oxidation state mapping
- Principal component analysis