About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
Presentation Title |
Exploring the Synergy of Al-Cr in Aqueous Passivation of [FeCoNi]CrxAly Compositionally Complex Alloys (CCAs) Across Cr Threshold Concentrations |
Author(s) |
Debashish Sur, William Blades, Emily Holcombe, Howie Joress, Jason Hattrick-Simpers, Brian DeCost, Kevin Ogle, Mitra Taheri, Karl Sieradzki, John Scully |
On-Site Speaker (Planned) |
Debashish Sur |
Abstract Scope |
FeCoNi-Crx-Aly CCAs with x+y < 0.25 were studied to delineate the role of Al in long-term passivation performance. A combinatorial thin film library with 177 different compositions was deposited and characterized through high throughput x-ray fluorescence and synchrotron x-ray diffraction to obtain compositions and phases present. Their aqueous passivation behavior was examined using a scanning droplet cell in sulfuric acid by DC and AC electrochemical methods to define the best-performing alloys. Bulk alloys containing Al and near Cr threshold were prepared based on the high throughput screened compositions for further medium to high fidelity testing. Passive film growth, performance, and oxide compositions were studied using electrochemical impedance spectroscopy and x-ray photoelectron spectroscopy techniques. The fate of each element towards the passivation process was defined using elemental dissolution rates using online ICP-OES. Overall, the role of Al-Cr synergy was investigated in both chloride free and chloride containing environments. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, High-Entropy Alloys, Thin Films and Interfaces |