|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||A High Throughput to High Fidelity Study of Aqueous Passivation in [FeCoNi]CrxAly Alloys Across Classical Cr Threshold Concentration
||Debashish Sur, Emily H. Holcombe, William H. Blades, Howie Joress, Jason Hattrick-Simpers, Ben Redeman, Tyrell McQueen, Karl Sieradzki, Mitra L. Taheri, John R. Scully
|On-Site Speaker (Planned)
FeCoNiCrxAly alloys with x+y < 0.25 (at.%) were studied with the goal of delineating the role of Al in long term passivation performance. A combinatorial thin film library with 177 different compositions was deposited and characterized through x-ray fluorescence and synchrotron x-ray diffraction to obtain compositions and phases present in each individual alloy. Their aqueous passivation behavior was examined using a scanning droplet cell in sulfuric acid by DC and AC electrochemical methods to identify the best-performing alloys. Bulk alloys containing Al and near the classical threshold of 12 at% Cr were prepared based on the thin-film screened compositions for further analysis. Passive film formation and growth behaviors were characterized using electrochemical techniques and x-ray photoelectron spectroscopy. An Al-Cr synergy was found to significantly improve corrosion performance. The passivation and corrosion protection behavior of Al-Cr alloys was investigated in chloride-free and chloride-containing environments.
||Planned: Metallurgical and Materials Transactions