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- Title
Unravelling the corrosion processes at steel/bentonite interfaces in in situ tests.
- Authors
Wersin, Paul; Hadi, Jebril; Kiczka, Mirjam; Jenni, Andreas; Grenèche, Jean‐Marc; Diomidis, Nikitas; Leupin, Olivier X.; Svensson, Daniel; Sellin, Patrik; Reddy, Bharti; Smart, Nicholas; Zhang, Zhidong
- Abstract
Microscopic and spectroscopic analyses were conducted on steel/bentonite interface samples removed from four in situ experiments that were carried out in three underground research laboratories at different temperatures and under different hydraulic and geochemical conditions. The results provide valuable information about the corrosion processes occurring in high‐level radioactive waste repositories. Systematic patterns can be deduced from the results, irrespective of carbon steel grade, type of bentonite and its degree of compaction, geochemical environment or experimental setup. Thus, a clear dependence of the corrosion rates on temperature and exposure period, as well as on the availability of H2O and O2 provided by the surrounding bentonite buffer, is observed. Furthermore, Fe(II) ions released by corrosion interact with the structural Fe in the clay. Recent developments highlight the usefulness of reactive transport modelling in understanding the coupled corrosion and Fe–clay interaction processes.
- Subjects
BENTONITE; RADIOACTIVE wastes; RADIOACTIVE waste repositories; STEEL corrosion; CARBON steel; MICROSCOPY
- Publication
Materials & Corrosion / Werkstoffe und Korrosion, 2023, Vol 74, Issue 11, p1716
- ISSN
0947-5117
- Publication type
Article
- DOI
10.1002/maco.202313755