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Influence of iron corrosion on nuclear glass alteration processes: nanoscale investigations of the iron-containing phases

Abstract : Several strategies propose to store and confine High level Radioactive Waste in a deep geological disposaI. Andra (French National Radioactive Waste Management Agency) suggests a multi barrier system including the glass canister, a carbon steel overpack and a low permeability clay host rock to prevent borosilicate glass alteration and to limit migration of radionuclides released under the action of water. However after thousand years and resaturation of clay, water will corrode the carbon steel overpack causing the release iron ions and precipitation of iron carbonates as corrosion products. The glass matrix will alter through glass hydrolysis and release silicon in solution. Thus, neoformed Fe-Si-O phases can precipitate in the glass alteration layer (GAL) or at the outer part of the GAL and lower the concentration of Si in solution, increasing glass dissolution. Consequently identification and characterization of nanocrystallized Fe-Si-O phases is crucial for modelling the mechanism of glass alteration in contact with iron. The results presented here are obtained on samples (mix of nuclear glass and iron powder) altered in the underground Laboratory of Bure (France). Nanoscale investigations ("Transmission Electron Microscopy and Scanning Transmission X-Ray Microscopy) show presence of neoformed nanocristallized phases (iron silicates) inside GAL and on the iron corrosion products (CP). Several families of structured Si-Fe-O phases are identified (e.g. smectite, chlorite, serpentine) according to the localization and the valence of iron in CP.
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Submitted on : Thursday, October 24, 2019 - 2:54:52 PM
Last modification on : Tuesday, January 19, 2021 - 12:10:03 PM
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  • HAL Id : cea-02331802, version 1


Charly Carriere, Gentaz Lucile, Delphine Neff, Florence Mercier-Bion, Eddy Foy, et al.. Influence of iron corrosion on nuclear glass alteration processes: nanoscale investigations of the iron-containing phases. Eurocorr 2016, Sep 2016, Montpellier, France. ⟨cea-02331802⟩



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