| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
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| Symposium
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Materials Science for Global Development -- Health, Energy, and Environment: An SMD Symposium in Honor of Wole Soboyejo
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| Presentation Title |
H-16: Corrosion Behavior of As-cast and Homogenized VCoNi and CrCoNi in an Acidic Medium |
| Author(s) |
Nicola Rundora, Michael Bodunrin, Lebidike Mampuru, Tabiri Asumadu, Mobin Vandadi, Desmond Edem Primus Klenam, Nima Rahbar, Wole Soboyejo |
| On-Site Speaker (Planned) |
Tabiri Asumadu |
| Abstract Scope |
The corrosion performance of medium-entropy alloys (MEAs) remains an important criterion for structural durability. This paper presents the corrosion results and mechanisms of as-cast and homogenized VCoNi and CrCoNi MEAs in a 3M sulfuric acid solution. The microstructure and phase constituents were analyzed using scanning electron microscopy and X-ray diffraction. The CrCoNi exhibited superior corrosion resistance to the VCoNi. In as-cast and homogenized conditions, the corrosion rate of CrCoNi was 10 times lower than the VCoNi despite a similar corrosion potential of 0.3 V vs Ag/AgCl. The homogenization treatment improved the corrosion resistance of CrCoNi by a factor of 10, whereas no discernible effect was observed for VCoNi with a constant corrosion rate of 0.32 mm/yr. The superior corrosion resistance of CrCoNi is attributed to the formation of a protective chromium oxide surface film on the alloy. Implications of the results for the design of robust multifunctional MEAs are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, |