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

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.
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Submitted on : Tuesday, September 1, 2020 - 6:01:10 PM
Last modification on : Wednesday, October 14, 2020 - 4:21:39 AM

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David Pally, Patrick Le Bescop, Michel Schlegel, Frédéric Miserque, Laure Chomat, et al.. Corrosion behavior of iron plates in cementitious solution at 80°C in anaerobic conditions. Corrosion Science, Elsevier, 2020, 170, pp.108650. ⟨10.1016/j.corsci.2020.108650⟩. ⟨cea-02927606⟩

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