Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 15, Pages 17321-17333Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19099
Keywords
chloride molten salt; high-temperature corrosion; Ni-based alloys; X-ray CT; TXM; molten salt corrosion; dealloying; multiscale imaging
Funding
- Molten Salts in Extreme Environments (MSEE) Energy Frontier Research Center by the U.S. Department of Energy, Office of Science, Basic Energy Sciences
- DOE [DE-SC0012704, DE-AC07-05ID14517, DE-AC05-00OR22725]
- MSEE through BNL
- DOE Office of Science [DE-SC0012704]
- U.S. DOE Office of Science Facility [DE-SC0012704]
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Growing interest in molten salts as effective high-temperature heat-transfer fluids for sustainable energy systems drives a critical need to fundamentally understand the interactions between metals and molten salts. This work utilizes the multimodal microscopy methods of synchrotron X-ray nanotomography and electron microscopy to investigate the 3D morphological and chemical evolution of two-model systems, pure nickel metal and Ni-20Cr binary alloy, in a representative molten salt (KCl-MgCl2 50-50 mol %, 800 degrees C). In both systems, unexpected shell-like structures formed because of the presence of more noble tungsten, suggesting a potential route of using Ni-W alloys for enhanced molten-salt corrosion resistance. The binary alloy Ni-20Cr developed a bicontinuous porous structure, reassembling functional porous metals manufactured by dealloying. This work elucidates better mechanistic understanding of corrosion in molten salts, which can contribute to the design of more reliable alloys for molten salt applications including next-generation nuclear and solar power plants and opens the possibility of using molten salts to fabricate functional porous materials.
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