| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Materials Aging and Compatibility: Experimental and Computational Approaches to Enable Lifetime Predictions
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| Presentation Title |
Accelerated aging of aluminum alloys for long-term predictions of corrosion under atmospheric conditions of temperature and relative humidity |
| Author(s) |
David Zuyu Chen, Steven Field Buchsbaum, Warren Lee York, Tian Li, Sarah Matt, Savanna Richardson, Benjamin Thanh Pham, Susan Carroll, Siping Qiu |
| On-Site Speaker (Planned) |
David Zuyu Chen |
| Abstract Scope |
The 7xxx-series aluminum (Al) alloys are a material of choice because of their high strength, low density, and resistance to corrosion, but prolonged exposure to atmospheric corrosion conditions leads to shortened lifetimes and degraded performance. We conducted accelerated aging studies on roughly polished coupons of Al 7050-T7451 alloy and characterized their evolution for up to 6 months to elucidate the fundamental mechanisms behind atmospheric corrosion. Results show mass gain over time at higher relative humidities is likely diffusion-controlled. At the most extreme condition of 70 °C 90% RH, an ~1 μm-thick oxide layer forms, while at conditions of lower temperature and humidity, pit-like features containing oxide appear. The growth of these features appear to self-terminate over time, indicative of a protective nature. These results offer valuable insights into the long-term performance of Al alloys and provide inputs for development of lifetime prediction models. Prepared by LLNL under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Thin Films and Interfaces, Environmental Effects |