Interaction between carbon steel and low-pH bentonitic cement grout in anoxic, high temperature (80°C) and spatially heterogeneous conditions - IRSN - Institut de radioprotection et de sûreté nucléaire Accéder directement au contenu
Article Dans Une Revue Corrosion Science Année : 2023

Interaction between carbon steel and low-pH bentonitic cement grout in anoxic, high temperature (80°C) and spatially heterogeneous conditions

Résumé

Anoxic corrosion processes impacting carbon steel samples for both intimate and imperfect metal/ low-pH bentonitic cement grout (BCG) contacts were studied at 80 °C. SEM, XRD and µ-Raman spectroscopy analyses supported by geochemical modelling allowed a full characterization of the corrosion mechanism. Steel in direct contact with BCG suffered from localized corrosion (pits measuring up to 160 µm in depth after 150 days of exposure) principally triggered by the presence of HS-. Depending on silicate and sulphide ingress from the BCG towards the interface, neoformed magnetite may be converted to iron silicates and/or iron sulphides.

Domaines

Matériaux

Dates et versions

irsn-03880498 , version 1 (08-12-2023)

Identifiants

Citer

J. Goethals, Laurent de Windt, Charles Wittebroodt, A. Abdelouas, Xavier de La Bernardie, et al.. Interaction between carbon steel and low-pH bentonitic cement grout in anoxic, high temperature (80°C) and spatially heterogeneous conditions. Corrosion Science, 2023, 211, pp.110852. ⟨10.1016/j.corsci.2022.110852⟩. ⟨irsn-03880498⟩
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