The Oxygen Evolution Reaction Drives Passivity Breakdown for Ni-Cr-Mo Alloys

The Oxygen Evolution Reaction Drives Passivity Breakdown for Ni-Cr-Mo Alloys

© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 39 vom: 26. Sept., Seite e2304621
1. Verfasser: Larsson, Alfred (VerfasserIn)
Weitere Verfasser: Grespi, Andrea, Abbondanza, Giuseppe, Eidhagen, Josefin, Gajdek, Dorotea, Simonov, Konstantin, Yue, Xiaoqi, Lienert, Ulrich, Hegedüs, Zoltan, Jeromin, Arno, Keller, Thomas F, Scardamaglia, Mattia, Shavorskiy, Andrey, Merte, Lindsay R, Pan, Jinshan, Lundgren, Edvin
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article Ni-Cr-Mo corrosion mechanisms nickel alloys oxygen evolution reaction passivity breakdown transpassive dissolution
Beschreibung
Zusammenfassung:© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.
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 Mo4+ sites in the oxide film to Mo6+ that can be dissolved, which results in passivity breakdown. This is fundamentally different from typical transpassive breakdown of Cr-containing alloys where Cr6+ 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
Beschreibung:Date Revised 27.09.2023
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202304621