Long-term anoxic corrosion of iron

Saheb, Mandana; Neff, Delphine; Dillmann, Philippe; Descostes, Michaël; Matthiesen, Henning

doi:10.1533/9781782421573.3.260

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…As a complementary approach, characterization of archaeological artifacts have been implemented to identify corrosion mechanisms and products of likely preponderance over timescales inaccessible to laboratory experiments or modern industry (e.g. [40][41][42][43][44][45][46][47][48][49][50]). To consolidate this body of knowledge, the French Agency for the Management of Nuclear Waste (Andra) has designed an in situ experiment in the COx claystone.…”

Section: Introductionmentioning

confidence: 99%

Corrosion at the carbon steel-clay borehole water interface under anoxic alkaline and fluctuating temperature conditions

Schlegel

Necib²,

Daumas³

et al. 2018

Corrosion Science

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Coupons of carbon steel were corroded in situ in anoxic clay porewater under slightly alkaline conditions. Sample damage was less than 1 μm for 9 months at 85°C only, and corrosion interfaces were covered by a thin, protective layer of Fe-silicate. The damage was more significant for samples exposed to room temperature transients (up to 38 μm for two years), and the long-term surface differentiated in cathodic (Fe-silicate covered) areas and anodic crevices filled with siderite, chukanovite, β-Fe 2 (OH) 3 Cl, and covered by tubercles. Sulfide compounds were detected, and were related to the metabolism of sulfate-reducing prokaryotes detected by microbiological techniques.

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Section: Introductionmentioning

confidence: 99%

Corrosion at the carbon steel-clay borehole water interface under anoxic alkaline and fluctuating temperature conditions

Schlegel

Necib²,

Daumas³

et al. 2018

Corrosion Science

View full text Add to dashboard Cite

show abstract

Corrosion of carbon steel in clay environments relevant to radioactive waste geological disposals, Mont Terri rock laboratory (Switzerland)

Necib¹,

Diomidis²,

Keech³

et al. 2017

Swiss Journal of Geosciences Supplement

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Corrosion of carbon steel in clay environments relevant to radioactive waste geological disposals, Mont Terri rock laboratory (Switzerland)

Necib¹,

Diomidis

Keech

et al. 2017

Swiss J Geosci

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Carbon steel is widely considered as a candidate material for the construction of spent fuel and high-level waste disposal canisters. In order to investigate corrosion processes representative of the long term evolution of deep geological repositories, two in situ experiments are being conducted in the Mont-Terri rock laboratory. The iron corrosion (IC) experiment, aims to measure the evolution of the instantaneous corrosion rate of carbon steel in contact with Opalinus Clay as a function of time, by using electrochemical impedance spectroscopy measurements. The Iron Corrosion in Bentonite (IC-A) experiment intends to determine the evolution of the average corrosion rate of carbon steel in contact with bentonite of different densities, by using gravimetric and surface analysis measurements, post exposure. Both experiments investigate the effect of microbial activity on corrosion. In the IC experiment, carbon steel showed a gradual decrease of the corrosion rate over a period of 7 years, which is consistent with the ongoing formation of protective corrosion products. Corrosion product layers composed of magnetite, mackinawite, hydroxychloride and siderite with some traces of oxidising species such as goethite were identified on the steel surface. Microbial investigations revealed thermophilic bacteria (sulphate and thiosulphate reducing bacteria) at the metal surface in low concentrations. In the IC-A experiment, carbon steel samples in direct contact with bentonite exhibited corrosion rates in the range of 2 lm/year after 20 months of exposure, in agreement with measurements in absence of microbes. Microstructural and chemical characterisation of the samples identified a complex corrosion product consisting mainly of magnetite. Microbial investigations confirmed the limited viability of microbes in highly compacted bentonite.

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Long-term anoxic corrosion of iron

Cited by 6 publications

References 27 publications

Corrosion at the carbon steel-clay borehole water interface under anoxic alkaline and fluctuating temperature conditions

Corrosion at the carbon steel-clay borehole water interface under anoxic alkaline and fluctuating temperature conditions

Corrosion of carbon steel in clay environments relevant to radioactive waste geological disposals, Mont Terri rock laboratory (Switzerland)

Corrosion of carbon steel in clay environments relevant to radioactive waste geological disposals, Mont Terri rock laboratory (Switzerland)

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