1D simulation of canister galvanic corrosion in saturated compacted bentonite

Stoulil, J.; Kouřil, Milan; Павлова, Людмила Васильевна; Dobrev, David; Gondolli, Jenny

doi:10.1002/maco.201710014

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Cu, being more noble, would act as the cathode (with O 2 reduction as the primary cathodic reaction), while CS would experience accelerated corrosion as the anode (Fe oxidation). [5][6][7][8][9] It is judicious to evaluate what would happen in such a scenario.…”

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confidence: 99%

Influence of Area Ratio and Chloride Concentration on the Galvanic Coupling of Copper and Carbon Steel

Standish¹,

Braithwaite²,

Shoesmith³

et al. 2019

J. Electrochem. Soc.

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Carbon steel (CS) vessels coated with ∼3 mm of Cu have been proposed for the permanent disposal of used nuclear fuel in a deep geological repository (DGR) in Canada. In the event of an undetected defect in the Cu coating that exposes the underlying CS to groundwater, the possibility of galvanically accelerated corrosion of CS arises. In this work, the impact of O 2 availability, NaCl solution concentration, and cathode:anode area ratio on the galvanic corrosion behavior of Cu/CS couples was evaluated by monitoring the galvanic potential of the couple and the galvanic current passing between Cu and CS. The corrosion products and surface damage were analyzed using Raman spectroscopy and SEM/EDX. Varying the Cu:CS area ratio from 1:1 to 2500:1, the [Cl − ] from 0.001 to 3.0 M, the sparging gas from air to Ar, and monitoring the resulting changes in the galvanic current, galvanic potential, corrosion products, and surface damage showed that the galvanic corrosion of CS was most severe when it was exposed to air-sparged solution with a moderate [Cl − ] (0.1 M) as part of the couple with the largest Cu:CS area ratio.

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confidence: 99%

Influence of Area Ratio and Chloride Concentration on the Galvanic Coupling of Copper and Carbon Steel

Standish¹,

Braithwaite²,

Shoesmith³

et al. 2019

J. Electrochem. Soc.

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“…It is candidate material for outer case in Scandinavian concept [1][2][3][4][5] and for coating in Canadian [6][7][8][9][10]. Copper is also one of the candidate materials for construction of canisters in Czech concept [11][12][13][14][15][16][17][18]. In previous works we studied the effect of sulphide content on corrosion rate of copper in bentonite pore solution [18] and simulation of galvanic couple with carbon steel [14].…”

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confidence: 99%

Exposure tests of copper foils in a slurries of different bentonites

Stoulil

Kouřil

Dobrev

2019

Koroze a Ochrana Materialu

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The goal of the study was to compare corrosion performance of copper in different bentonite slurries. Copper coil samples were exposed in a slurries of bentonites BaM, Rokle, B75, G2M, Voltex, Sabenil. The test was carried out under anaerobic conditions in glovebox at laboratory temperature for duration of one to four months. Samples were evaluated by means of X-ray diffraction and mass loss. Liquid parts of slurries were analysed by ion chromatography and pH meter. The resistance of copper in all studied bentonites was very high. Corrosion rates were in order of tenths of micrometers per year. No trend between pore solution composition and corrosion rate or composition of corrosion products was observed.

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“…The Czech concept [1][2][3][4][5][6][7][8] of a HLW canister for deep geological repository considers three combinations of metallic material inner/outer case:…”

Section: Introductionmentioning

confidence: 99%

Localised Corrosion of Stainless Steels 316l and 2205 in Synthetic Bentonite Pore Water and Bentonite Slurry

Stoulil

Павлова

Kouřil

2019

Acta Metall. Slovaca

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<p class="AMSmaintext">One concept for Czech canister construction for deep geological repository considers stainless steel as an inner case material. Corrosion resistance to localised (pitting/crevice) corrosion and stress corrosion cracking of austenitic stainless steel 316L and duplex steel 2205 was studied. The environment was synthetic bentonite pore water (SBPOW) of domestic bentonite BaM, or a slurry of bentonite in SBPOW. Tests were carried out between 40 °C and 90 °C under anaerobic conditions of a nitrogen atmosphere. The following methods were used for evaluation: potentiostatic tests at oxidation-reduction potential of the environment, long-term exposure tests in SBPOW and slurry, slow strain rate tensile test (SSRT), exposure test of U-bends, and optical microscopy. Results showed no susceptibility of either material to stress corrosion cracking. No localised corrosion was observed up to 70 °C. There was no localised attack observed in SBPOW at 90 °C, but there was localised corrosion detected in the bentonite slurry. Forced breakdown of the passive layer during SSRT, and artificial crevices (O-rings), showed no effect on localised corrosion propagation. The detrimental effect was probably a result of the adsorption ability of the bentonite particles, which allowed breakdown of passive layer and disabled repassivation of metastable pits.</p>

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1D simulation of canister galvanic corrosion in saturated compacted bentonite

Cited by 7 publications

References 10 publications

Influence of Area Ratio and Chloride Concentration on the Galvanic Coupling of Copper and Carbon Steel

Influence of Area Ratio and Chloride Concentration on the Galvanic Coupling of Copper and Carbon Steel

Exposure tests of copper foils in a slurries of different bentonites

Localised Corrosion of Stainless Steels 316l and 2205 in Synthetic Bentonite Pore Water and Bentonite Slurry

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