Role of sulphide species on the behaviour of carbon steel envisioned for high-level radioactive disposal : interaction between sulphide and corrosion products
type: Dataset
description: This PhD work deals with the nuclear waste disposal. In France, it is envisaged byAndra (French national radioactive waste management agency) that high-level radioactivewastes will be confined in a glass matrix, stored in a stainless steel canister, it self placed in a carbon steel overpack. The wastes will then be stored at a depth of ~500 m in a deep geological repositery, drilled in a very stiff (indurated) clay (argillite) formation. The kineticsof corrosion expected for the overpack in this disposal concept are low and will stay low if the somehow protective rust layer that will develop initially on the steel surface remains undamaged. Local changes of the physico-chemical conditions may however degrade this layer and induce accelerated kinetics of corrosion. In particular, the growth of sulphate reducing bacteria (SRB) close to the steel overpack cannot be excluded and the sulphid especies these micro-organisms produce may modify the corrosion process. The aim of this work was then to achieve a better understanding of the corrosion system constituted with steel, its rust layer mainly made of siderite FeCO3, and a sulphide-containing electrolyte.First, it proved necessary to characterise the iron sulphides involved in the corrosion processes by Raman micro-spectroscopy so as to study their formation and transformation mechanisms in various conditions of Fe(II) and S(-II) concentration, pH, temperature andaeration. It could be demonstrated that the Raman spectrum of mackinawite FeS, thecompound that precipitated in any case from dissolved Fe(II) and S(-II) species with the experimental conditions considered here, depended on the crystallinity and oxidation state.Moreover, the mechanisms of the oxidation of mackinawite into greigite Fe3S4 in acidicanoxic solutions at 80°C could be described. Finally, iron sulphides, often present on archaeological artefacts, could be identified using Raman micro-spectroscopy. The compounds present were mainly mackinawite and grei…
identifier: NNT: 2011LAROS328
issued: 2026-05-21T19:29:15.039526
language: fr
modified: 2026-05-21T19:29:15.039533
contact point: Organization
  fn: CCSD
keyword: analogues-archeologiques
keyword: anoxic-media
keyword: archaeological-analogues
keyword: corrosion-du-fer
keyword: infoeu-reposemanticsdoctoralthesis
keyword: iron-corrosion
keyword: iron-sulphide
keyword: micro-spectroscopie-raman
keyword: milieu-anoxique
keyword: raman-micro-spectroscopy
keyword: spiotherengineering-sciences-physicsother
keyword: sulfures-de-fer
keyword: theses
landing page: https://theses.hal.science/tel-00688136

Role of sulphide species on the behaviour of carbon steel envisioned for high-level radioactive disposal : interaction between sulphide and corrosion products
type: Distribution
format: HTML
issued: 2026-05-21T19:29:15.145884
modified: 2026-05-21T19:29:14.994254
access URL: https://theses.hal.science/tel-00688136

test_moissonnage_selune
type: Agent