Corrosion behavior of iron plates in cementitious solution at 80°C in anaerobic conditions

David Pally; Patrick Le Bescop; Michel Schlegel; Frédéric Miserque; Laure Chomat; Delphine Neff; Valérie l'Hostis

doi:10.1016/j.corsci.2020.108650

Journal articles

Corrosion behavior of iron plates in cementitious solution at 80°C in anaerobic conditions

David Pally ¹ Patrick Le Bescop ¹ Michel Schlegel ^{2, *} Frédéric Miserque ³ Laure Chomat ¹ Delphine Neff ⁴ Valérie l'Hostis ⁵

* Corresponding author

1 SECR - Service d'Etudes du Comportement des Radionucléides

2 SEARS - Service d'études analytiques et de réactivité des surfaces

3 SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement

4 LAPA - UMR 3685 - Laboratoire Archéomatériaux et Prévision de l'Altération

NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)

5 DPC - Département de Physico-Chimie

Abstract : Iron was corroded in anoxic cementitious (pH 13.2) media (filtered porewater or cement slurry) at 80°C; corrosion products were investigated by microscopic techniques. A thin film of magnetite (Fe$_3$O$_4$) formed during the first immersion days. For longer immersion times (90 days) in cement slurry, hydroandradite (HA) (Ca$_3$(Fe$^{3+}$)$_2$(SiO$_4$)$_y$(OH)$_4$$_(3-y)$) formed a dense outer layer and an heterogeneous inner layer. A thin oxide layer is always observed in contact with metal and is believed to correspond to a protective barrier. Our results suggest that in the conditions of the Belgian Supercontainer for radioactive waste disposal, a passive layer slowing down corrosion can form.

Keywords : Iron Concrete Alkaline corrosion Magnetite Hydroandradite Barrier layer

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Journal articles

Domain :

Chemical Sciences / Inorganic chemistry

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Submitted on : Tuesday, September 1, 2020 - 6:01:10 PM
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Corrosion behavior of iron plates in cementitious solution at 80°C in anaerobic conditions

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Corrosion behavior of iron plates in cementitious solution at 80°C in anaerobic conditions

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