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| Home > Publications database > The Oxygen Evolution Reaction Drives Passivity Breakdown for Ni–Cr–Mo Alloys |
| Home > Publications database > The Oxygen Evolution Reaction Drives Passivity Breakdown for Ni–Cr–Mo Alloys |
| Journal Article | PUBDB-2023-05965 |
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2023
Wiley-VCH
Weinheim
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Please use a persistent id in citations: doi:10.1002/adma.202304621 doi:10.3204/PUBDB-2023-05965
Abstract: Corrosion is the main factor limiting the lifetime of metallic materials, and a fundamental understanding of the governing mechanism and surface processes is difficult to achieve since the thin oxide films at the metal–liquid interface governing passivity are notoriously challenging to study. In this work, a combination of synchrotron-based techniques and electrochemical methods is used to investigate the passive film breakdown of a Ni–Cr–Mo alloy, which is used in many industrial applications. This alloy is found to be active toward oxygen evolution reaction (OER), and the OER onset coincides with the loss of passivity and severe metal dissolution. The OER mechanism involves the oxidation of Mo$^{4+}$ sites in the oxide film to Mo$^{6+}$ that can be dissolved, which results in passivity breakdown. This is fundamentally different from typical transpassive breakdown of Cr-containing alloys where Cr$^{6+}$ is postulated to be dissolved at high anodic potentials, which is not observed here. At high current densities, OER also leads to acidification of the solution near the surface, further triggering metal dissolution. The OER plays an important role in the mechanism of passivity breakdown of Ni–Cr–Mo alloys due to their catalytic activity, and this effect needs to be considered when studying the corrosion of catalytically active alloys.
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; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 25 ; JCR ; Nationallizenz
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