| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection III
|
| Presentation Title |
Designing Lubricant-impregnated Coatings to Reduce Corrosion and Hydrogen Embrittlement |
| Author(s) |
Sami Khan, Kripa K. Varanasi |
| On-Site Speaker (Planned) |
Sami Khan |
| Abstract Scope |
Lubricant-impregnated surfaces (LIS) consisting of thin films of lubricant held stably in micro-textures have been systematically designed and studied for reducing corrosion. We fabricate microposts on silicon using photolithography, varying inter-post spacing systematically from 5μm to 50 μm, and conformally sputter-coat a thin layer of iron to study the corrosion phenomena electrochemically in an aqueous 3.5 wt% sodium chloride solution, and we show that the corrosion rate on LIS is drastically reduced by three orders of magnitude. Using electrochemical impedance spectroscopy, we develop model circuits for various LIS configurations and show that the measured resistances and capacitances agree with a theoretical model, and discuss in detail where deviations occur. We also study the role of lubricant layers towards reducing hydrogen embrittlement, and using a Devanathan-Stachurski permeation cell we show that under accelerated conditions, the effective diffusion coefficient of hydrogen on steel is reduced by an order of magnitude. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, Thin Films and Interfaces, Composites |