 |
 |
|
Vandenborre, J., Crumiere, F., Blain, G., Essehli, R., Humbert, B. & Fattahi, M. (2013) Alpha localized radiolysis and corrosion mechanisms at the iron/water interface: Role of molecular species. J. Nucl. Mater. 433 124–131.
Added by: Laurent Cournède (2016-03-10 21:23:31) |
| Type de référence: Article DOI: 10.1016/j.jnucmat.2012.09.034 Numéro d'identification (ISBN etc.): 0022-3115 Clé BibTeX: Vandenborre2013 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: aqueous-solution, atmospheric corrosion, confined water, green rust, h-2 production, h2o2 decomposition, hydrogen-peroxide, iron, irradiation, water radiolysis Créateurs: Blain, Crumiere, Essehli, Fattahi, Humbert, Vandenborre Collection: J. Nucl. Mater. |
Consultations : 1/722
Indice de consultation : 5% Indice de popularité : 1.25% |
| Résumé |
|
This paper is devoted to the iron corrosion phenomena induced by the alpha (He-4(2+)) water radiolysis species studied in conjunction with the production/consumption of H-2 at the solid/solution interface. On one hand, the solid surface is characterized during the He-4(2+) ions irradiation by in situ Raman spectroscopy; on another hand, the H-2 gas produced by the water radiolysis is monitored by ex situ gas measurements. The He-4(2+) ions irradiation experiments are provided either by the CEMHTI (E = 5.0 MeV) either by the ARRONAX (E = 64.7 MeV) cyclotron facilities. The iron corrosion occurs only under irradiation and can be slowed down by H-2 reductive atmosphere. Pure iron and carbon steel solids are studied in order to show two distinct behaviors of these surfaces vs. the He-4(2+) ions water irradiation: the corrosion products identified are the magnetite phase (Fe(II)Fe(III)(2)O-4) correlated to an H-2 consumption for pure iron and the lepidocrocite phase (gamma-Fe(III)OOH) correlated to an H-2 production for carbon steel sample. This paper underlined the correlation between the iron corrosion products formation onto the solid surface and the H-2 production/consumption mechanisms. H2O2 species is considered as the single water radiolytic species involved into the corrosion reaction at the solid surface with an essential role in the oxidation reaction of the iron surface. We propose to bring some light to these mechanisms, in particular the H-2 and H2O2 roles, by the in situ Raman spectroscopy during and after the He-4(2+) ions beam irradiation. This in situ experiment avoids the evolution of the solid surface, in particular phases which are reactive to the oxidation processing. (c) 2012 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |