Investigation of steel corrosion in MX80 bentonite at 120°C

Hélène Lotz; Charly Carrière; Christian Bataillon; Emmanuel Gardes; Isabelle Monnet; Eddy Foy; Michel Schlegel; James Dynes; Delphine Neff; Florence Mercier‐bion; Philippe Dillmann

doi:10.1002/maco.202011777

Journal articles

Investigation of steel corrosion in MX80 bentonite at 120°C

Hélène Lotz ^{1, 2, *} Charly Carrière ^{1, 2} Christian Bataillon ³ Emmanuel Gardes ⁴ Isabelle Monnet ⁴ Eddy Foy ^{1, 2} Michel Schlegel ⁵ James Dynes ^{6, 7} Delphine Neff ^{1, 2} Florence Mercier‐bion ^{1, 2} Philippe Dillmann ^{1, 2}

* Corresponding author

1 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)

2 IRAMAT - LMC - IRAMAT - Laboratoire Métallurgies et Cultures

IRAMAT - Institut de Recherches sur les Archéomatériaux

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

4 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique

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

6 Canadian Light Source

7 U of S - University of Saskatchewan [Saskatoon]

Abstract : Corrosion experiments were performed on two metallic substrates, a ferritic–pearlitic steel (P285NH) and a ferritic one (Armco), in silicate environment during 30 days at 120°C. Corrosion products were characterized in terms of morphology (scanning electron microscope and transmission electron microscopy), composition (energydispersive X-ray spectroscopy) and structure (µ-Raman, selected area electron diffraction, X-ray absorption near edge structure). Results show a nanometric inner layer made of compact and adherent nanocrystallized magnetite with, locally a thickness up to several micrometers due to the metal microstructure. An outer layer of Fe-rich phyllosilicate, smectite and serpentine, more porous than the inner one and poorly adherent is observed around both the samples.

Keywords : Steel anoxic corrosion MX80 bentonite multiscale analysis magnetite iron silicate

Document type :

Journal articles

Domain :

Chemical Sciences / Material chemistry

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https://hal-cea.archives-ouvertes.fr/cea-02931494
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