Aqueous passivation of multi-principal element alloy Ni38Fe20Cr22Mn10Co10: Unexpected high Cr enrichment within the passive film
| Autor: | Angela Y. Gerard, Elizabeth J. Kautz, James E. Saal, Daniel K. Schreiber, John R. Scully, Pin Lu, Junsoo Han, Kevin Ogle, Stephen McDonnell, Gerald S. Frankel |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics Passivation Alloy Oxide Analytical chemistry 02 engineering and technology Atom probe engineering.material 01 natural sciences law.invention Metal chemistry.chemical_compound X-ray photoelectron spectroscopy law 0103 physical sciences Dissolution 010302 applied physics Metals and Alloys Atomic emission spectroscopy 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials chemistry visual_art Ceramics and Composites engineering visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Acta Materialia. 198:121-133 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2020.07.024 |
| Popis: | The aqueous passivation of a non-equiatomic Ni38Fe20Cr22Mn10Co10 - at.% (Ni40Fe20Cr20Mn10Co10 - wt.%) multi-principal element alloy (MPEA) was investigated in 0.1 M NaCl at pH 4 and compared to a conventional binary Ni76Cr24 – at.% (Ni78Cr22 – wt.%) alloy. The electrochemical behavior and oxide film characteristics were explored utilizing in-situ electrochemical and ex-situ surface-sensitive techniques. The passive film composition, thickness, and elemental valence states, as well as, the fate of each element were studied by in-situ atomic emission spectro-electrochemistry, ex-situ X-ray photoelectron spectroscopy, and atom probe tomography. The Ni38Fe20Cr22Mn10Co10 MPEA demonstrated slightly better corrosion resistance compared to the binary Ni76Cr24, alloy. Passive films on the MPEA contained primarily Cr, and small amounts of Ni, Fe, Co and Mn, while dissolution of Ni, Fe, Co was observed. Ni0 was enriched at the oxide/metal interface while Cr was depleted. Enrichment of Cr in the passive film occurred to a greater extent in the MPEA than for the Ni-Cr binary alloy. Enrichment factors were determined and the origins of enrichment are discussed. |
| Databáze: | OpenAIRE |
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