Carbon steel (C-steel; E24 and S235 grades) and stainless steel (316L) electrodes were corroded in situ in Opalinus clay under anoxic conditions in a vertical descending borehole. The electrodes were exposed at ambient temperature for two years, and then at 85°C for five years. In situ electrochemical impedance spectroscopy showed that the instantaneous corrosion rate of C-steel decreased over time down to 1 µm year−1, followed by steady state. Microbial and chemical investigations showed that sulphate and thiosulphate reducing prokaryotes were present in the porewater and at the metal surface. Post mortem characterisation revealed contrasting corrosion aspects. The E24 corrosion interface was thick and contained magnetite, mackinawite, hydroxychloride and siderite, together with more oxidised species (goethite, greigite, elemental sulphur). The S235 corrosion interface was thinner and contained siderite and mackinawite. Corrosion damage of the 316L electrode was negligible, and the surface was covered by a thin fringe of pyrite.
KingF.Predicting the lifetimes of nuclear waste containers. Jom. 2014; 66: 526–537. doi: 10.1007/s11837-014-0869-3
2.
AhnTM.Multiple lines of evidence for performance of the canister and waste form in long-term nuclear waste disposal: Reviews. Prog Nucl Energy. 2016; 93: 343–350. doi: 10.1016/j.pnucene.2016.08.020
NecibSLinardYCrussetDCorrosion at the carbon steel-clay borehole water and gas interfaces at 85°C under anoxic and transient acidic conditions. Corros Sci. 2016; 111: 242–258. doi: 10.1016/j.corsci.2016.04.039
5.
SchlegelMLNecibSDaumasSMicrostructural characterization of carbon steel corrosion in clay borehole water,under anoxic and transient acidic conditions. Corros Sci. 2016; 109: 126–144. doi: 10.1016/j.corsci.2016.03.022
6.
SchlegelMLNecibSDaumasSCorrosion at the carbon steel-clay borehole water and gas interfaces at 85 °C under anoxic alkaline conditions. Corros Sci. 2018; 136: 70–90. doi: 10.1016/j.corsci.2018.02.052
7.
NecibSDiomidisNKeechPCorrosion of carbon steel in clay environments relevant to radioactive waste geological disposals, Mont Terri rock laboratory (Switzerland). Swiss J Geosci. 2017; 110: 329–342. doi: 10.1007/s00015-016-0259-7
8.
PearsonFJAcrosDBathAGeochemistry of water in the Opalinus clay formation at the Mont Terri Rock Laboratory, Reports of the Federal Office for Water and Geology (FOWG), Geology Series No 5., (2003), Wabern, Switzerland.
9.
NingshenSMudaliUKRajB.Electrochemical impedance spectroscopy and its applications in corrosion research, corrosion reviews. Spec Issue. 2009; 27: 493–531.
10.
ChenYJepsonWP.EIS measurement for corrosion monitoring under multiphase flow conditions. Electrochim Acta. 1999; 44: 4453–4464. doi: 10.1016/S0013-4686(99)00160-7
HammersleyAP.FIT2D: a multi-purpose data reduction, analysis and visualization program. J Appl Cryst. 2016; 49: 646–652. doi: 10.1107/S1600576716000455
13.
BrionesJAReichardtW.Estimating microbial population counts by “most probable number” using Microsoft Excel (R). Microbiol Meth. 1999; 35: 157–161. doi: 10.1016/S0167-7012(98)00111-0
14.
HanssonEBOdziemkowskiMSGillhamRW.Formation of poorly crystalline iron monosulfides: surface redox reactions on high purity iron, spectroelectrochemical studies. Corros Sci. 2006; 48: 3767–3783. doi: 10.1016/j.corsci.2006.03.010
15.
MernaghTPTruduAG.A laser Raman microprobe study of some geologically important sulfide minerals. Chem Geol. 1993; 103: 113–127. doi: 10.1016/0009-2541(93)90295-T
16.
RuttHNNicolaJH.Raman spectra of carboantes of calcite structure. J Phys C Solid State Phys. 1974; 7: 4522–4528. doi: 10.1088/0022-3719/7/24/015
17.
SchlegelMLBataillonCBruckerFCorrosion of metal iron in contact with anoxic clay at 90 °C: characterization of the corrosion products after two years of interaction. Appl Geochem. 2014; 51: 1–14. doi: 10.1016/j.apgeochem.2014.09.002
18.
SchlegelMLBataillonCBenhamidaKMetal corrosion and argillite transformation at the water-saturated, high temperature iron-clay interface: a microscopic-scale study. Appl Geochem. 2008; 23: 2619–2633. doi: 10.1016/j.apgeochem.2008.05.019
19.
SchlegelMLBataillonCBlancCAnodic activation of iron corrosion in clay media under water-saturated conditions at 90°C: characterization of the corrosion interface. Environ Sci Technol. 2010; 44: 1503–1508. doi: 10.1021/es9021987
20.
LeonYDillmannPNeffDInterfacial layers at a nanometre scale on iron corroded in carbonated anoxic environments. RSC Adv. 2017; 7: 20101–20115. doi: 10.1039/C7RA01600J
21.
GroussetSBayleMDauzeresAStudy of iron sulphides in long-term iron corrosion processes: characterisations of archaeological artefacts. Corros Sci. 2016; 112: 264–275. doi: 10.1016/j.corsci.2016.07.022
22.
ReguerSDillmannPMirambetFLocal and structural characterisation of chlorinated phases formed on ferrous archaeological artefacts by µXRD and µXANES. Nucl Instrum Methods Phys Res B. 2005; 240: 500–504. doi: 10.1016/j.nimb.2005.06.217
23.
GaudinABartierDTrucheLFirst corrosion stages in Tournemire claystone/steel interaction: In situ experiment and modelling approach. Appl Clay Sci. 2013; 83-84: 457–468. doi: 10.1016/j.clay.2013.06.016
24.
GaudinAGaboreauSTinseauEMineralogical reactions in the Tournemire argillite after in-situ interaction with steels. Appl Clay Sci. 2009; 43: 196–207. doi: 10.1016/j.clay.2008.08.007
25.
NesicS.Key issues related to modelling of internal corrosion of oil and gas pipelines - A review. Corros Sci. 2007; 49: 4308–4338. doi: 10.1016/j.corsci.2007.06.006
26.
KermaniMBMorshedA.Carbon dioxide corrosion in oil and gas production - A compendium. Corrosion. 2003; 59: 659–683. doi: 10.5006/1.3277596
27.
PoultonSWKromMDRaiswellR.A revised scheme for the reactivity of iron (oxyhydr)oxide minerals towards dissolved sulfide. Geochim Cosmochim Acta. 2004; 68: 3703–3715. doi: 10.1016/j.gca.2004.03.012
28.
CanfieldDERaiswellRBottrellS.The reactivity of sedimentary iron minerals toward sulfide. Am J Sci. 1992; 292: 659–683. doi: 10.2475/ajs.292.9.659
29.
SavoyeSMichelotJLMatrayJMA laboratory experiment for determining both the hydraulic and diffusive properties and the initial pore-water composition of an argillaceous rock sample: a test with the Opalinus clay (Mont Terri, Switzerland). J Contaminant Hydrol. 2012; 128: 47–57. doi: 10.1016/j.jconhyd.2011.09.011
30.
DescostesMBlinVBazer-BachiFDiffusion of anionic species in Callovo-Oxfordian argillites and Oxfordian limestones (Meuse-Haute Marne, France). Appl Geochem. 2008; 23: 655–677. doi: 10.1016/j.apgeochem.2007.11.003
31.
TrucheLBergerGDestrignevilleCKinetics of pyrite to pyrrhotite reduction by hydrogen in calcite buffered solutions between 90 and 180°C: Implications for nuclear waste disposal. Geochim Cosmochim Acta. 2010; 74: 2894–2914. doi: 10.1016/j.gca.2010.02.027
32.
TrucheLJodin-CaumonMCLerougeCSulphide mineral reactions in clay-rich rock induced by high hydrogen pressure. Application to disturbed or natural settings up to 250°C and 30 bar. Chem Geol.2013; 351: 217–228. doi: 10.1016/j.chemgeo.2013.05.025
33.
El MendiliYAbdelouasAKarakurtGThe effect of temperature on carbon steel corrosion under geological conditions. Appl Geochem. 2015; 52: 76–85. doi: 10.1016/j.apgeochem.2014.11.008
34.
BernerRA.Thermodynamic stability of sedimentary iron sulfides. Am J Sci. 1967; 265: 773–785. doi: 10.2475/ajs.265.9.773
35.
Dos Santos AfonsoMStummW.Reductive dissolution of iron(III) (hydr)oxides by hydrogen sulfide. Langmuir. 1992; 8: 1671–1675. doi: 10.1021/la00042a030
36.
EtiqueMRomaineABihannicIAbiotically or microbially mediated transformations of magnetite by sulphide species: The unforeseen role of nitrate-reducing bacteria. Corros Sci. 2018; 142: 31–44. doi: 10.1016/j.corsci.2018.06.032
37.
CanfieldDEBernerRA.Dissolution and pyritization of magnetite in anoxic marine sediments. Geochim Cosmochim Acta. 1987; 51: 645–659. doi: 10.1016/0016-7037(87)90076-7
38.
ColeISMarneyD.The science of pipe corrosion: A review of the literature on the corrosion of ferrous metals in soils. Corros Sci. 2012; 56: 5–16. doi: 10.1016/j.corsci.2011.12.001
39.
CroletJ-LThevenotNNesicS.Role of conductive corrosion products in the protectiveness of corrosion layers. Corrosion. 1998; 54: 194–202. doi: 10.5006/1.3284844
40.
StaicopolusDN.The role of cementite in the acidic corrosion of steel. J Electrochem Soc. 1963; 110: 1121–1124. doi: 10.1149/1.2425602
41.
HaoXHDongJHEtimIINSustained effect of remaining cementite on the corrosion behavior of ferrite-pearlite steel under the simulated bottom plate environment of cargo oil tank. Corros Sci. 2016; 110: 296–304. doi: 10.1016/j.corsci.2016.04.042
42.
Mora-MendozaJLTurgooseS.Fe3C influence on the corrosion rate of mild steel in aqueousCO2 systems under turbulent flow conditions. Corros Sci. 2002; 44: 1223–1246. doi: 10.1016/S0010-938X(01)00141-X
43.
CroletJ-LDaumasSMagotM.pH regulation by sulfate-reducing bacteria, Corrosion 93, Houston, TX, 1993, in, NACE, 303.
