About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Microstructure and Corrosion Properties of NASA HR-1 Cold Spray Coatings for Repair of Nuclear Reactor Components |
| Author(s) |
Hindu Vardhan Ramineni, Venkata A.S Kandadai, Sathwik Tirukandyur, Marius Ellingsen, Jacob Petersen, Nathan Madden, Bharat K. Jasthi |
| On-Site Speaker (Planned) |
Bharat K. Jasthi |
| Abstract Scope |
Carbon steel, commonly used in nuclear reactor components, is susceptible to degradation under extreme conditions such as high radiation, temperature, and pressure. To enhance durability, NASA HR-1 alloy was applied as a protective coating using cold spray deposition. The effects of process gases (helium and nitrogen) on coating microstructure and corrosion resistance were systematically studied. Characterization techniques included optical microscopy, hot-stage TEM, and SEM. Electrochemical testing in 3.5 wt% NaCl revealed that helium-sprayed coatings exhibited ~106 times lower corrosion rates than uncoated steel. Salt fog testing over 96 hours confirmed ~83% reduction in corrosion-induced weight loss. After 120 hours in molten salt, helium-sprayed coatings formed a uniform Cr₂O₃ passive layer, while nitrogen-sprayed coatings showed delamination. Overall, using He as the process gas resulted in NASA HR-1 coatings with enhanced particle deformation, reduced porosity, and improved corrosion resistance, demonstrating strong potential for extending the life of structural components in harsh environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Surface Modification and Coatings, Characterization |