Iron corrosion in an anoxic soil: Comparison between thermodynamic modelling and ferrous archaeological artefacts characterised along with the local in situ geochemical conditions

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

doi:10.1016/j.apgeochem.2010.10.010

Cited by 60 publications

(48 citation statements)

References 18 publications

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“…The actual mineral paragenesis results from the competition between the mineral dissolution and precipitation kinetics, the local geochemical conditions (pH, Eh), and the transport of reaction products. In some archaeological artifacts, siderite (enriched in Ca 2þ ) and chukanovite are present at the contact with the iron surface and a thin discontinuous magnetite layer is displaced toward the interface with clay mineral (Neff et al, 2005;Saheb et al, 2009Saheb et al, , 2010. This feature can be interpreted as relics of an early oxic stage.…”

Section: Steel Corrosion In Claymentioning

confidence: 94%

Stability of Clay Barriers Under Chemical Perturbations

Bildstein

Claret

2015

Natural and Engineered Clay Barriers

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Section: Steel Corrosion In Claymentioning

confidence: 94%

Stability of Clay Barriers Under Chemical Perturbations

Bildstein

Claret

2015

Natural and Engineered Clay Barriers

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“…The corrosion of carbon steel in the conditions expected in the geological repository has been studied through long-term corrosion tests both in surface laboratories and in the Meuse/HauteMarne underground laboratory in Bure, France [11][12][13]. The characterization of archaeological artefacts, such as nails buried for several centuries in an anoxic carbonated environment on a 16 th -century steelmaking site, was also a means of supporting the experimental results on a larger time scale [14][15][16][17].…”

Section: Alteration In Presence Of Environment Materialsmentioning

confidence: 97%

Key Phenomena Governing HLW Glass Behavior in the French Deep Geological Disposal

et al. 2015

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According to the Planning Act of 28th June 2006, Andra is in charge of ensuring the sustainable management of all radioactive waste generated in France, especially the high-level and long-lived vitrified waste produced from spent fuel recycling.Since 2006, all the studies and research related to the components of HLW cells have been incorporated into a broader R&D program which aims at characterizing and modeling (i) the glass matrix dissolution, (ii) the corrosion of the overpack and the lining, and (iii) the claystone evolution in the near field, considering all the interactions between these surrounding materials. This program, coordinated by Andra, has involved up to eighteen laboratories.After closure of disposal cells and overpack failure, glass alteration is expected to begin in partially saturated conditions due to hydrogen production resulting from carbon steel corrosion in anoxic conditions. Therefore, the glass should at least partially be hydrated by water vapor during thousands of years until complete saturation. A part of the studies aimed to determine the glass behavior in such conditions, the influence of the main parameters (temperature, relative humidity) and consequences of vapor hydration on subsequent radionuclides release by water leaching.In addition, the major part of the work focused on the influence of the environment on glass alteration. The effect of clay pore water on glass alteration rates (initial rate, rate drop and residual rate) was determined and particularly that of pH and magnesium. The nature of steel corrosion products and their interactions with glass alteration were also investigated. All these studies relied on experiments in surface laboratories, in Andra's underground laboratory, together with natural or archeological analogs and modeling studies.

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“…The characterisation of the environmental conditions allows for modelling the thermodynamic equilibria governing the pore water composition [31,33]. Figure 13.3 presents the Pourbaix diagram (Eh-pH) established using the analyses of the pore water from the piezometer located near the excavation zones and is expected to be the most representative of the initial reducing conditions.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

“…It has been selected because part of its waterlogged zone contains numerous archaeological nails [26]. To study the environmental parameters, piezometers are installed at relevant locations near the excavation zones [31]. They allow for directly measuring the in-situ conditions (oxygen content, pH, Eh), and for collecting pore water to identify its chemistry.…”

Section: The Environmentmentioning

confidence: 99%