- By:
- Raiman, Stephen S; Mayes, Richard T; Kurley III, James M; Parrish, Riley; Vogli, Evelina
- Journal Name:
- Solar Energy Materials and Solar Cells
- Page Number:
- 110028
- Volume:
- 201
- Issue Number:
- n/a
- Publication Date:
- November 9, 2023
- View DOI Listing:
- https://doi.org/10.1016/j.solmat.2019.110028
Abstract
Amorphous metal coatings were developed to improve the corrosion resistance of structural alloys in molten salts for use as salt-facing materials in concentrating solar power (CSP) and molten salt reactor (MSR) applications. Three coatings were tested. One Fe-based, fully amorphous coating, and two Ni-based partially amorphous coatings. The candidate coatings were applied to samples made from Ni-based alloy 230, and exposed to KCl–MgCl2 at 750 °C for 300 h in sealed Mo capsules. After exposure, uncoated alloy 230 samples were depleted in chromium near the surface, as measured by SEM-EDS. The attack had an average depth of 33 μm. All three coatings performed well, showing no observable degradation during exposure, despite chromium contents between 20% and 40%. XRD and TEM measurements showed the coatings were fully crystallized after exposure, so the excellent corrosion resistance can likely be attributed to the recrystallized microstructure of the coatings.
