Microstructural characterization of carbon steel corrosion in clay borehole water under anoxic and transient acidic conditions

Schlegel, Michel L.; Necib, Sophia; Daumas, Sylvie; Blanc, Cécile; Foy, Eddy; Trcera, Nicolas; Romaine, Alexandre

doi:10.1016/j.corsci.2016.03.022

Cited by 33 publications

(42 citation statements)

References 58 publications

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“…Coupons of P235 and P235s steel were used for microstructural characterization of sample surfaces and cross sections ( Table 2). For cross sections, coupons were embedded in epoxy resin (Epofix, Struers), cut perpendicular to the smallest side, and polished to at final roughness of 1 μm [52]. These operations were performed in a glove box under N 2 atmosphere to minimize oxidation during preparation.…”

Section: Coupon Preparation and Microstructural Characterizationmentioning

confidence: 99%

“…The trace of the coupon original surface was identified as the line separating cementite-containing and cementitefree CPs. Energy-Dispersive X-ray (EDX) spectra were collected on Points of Interest (PI) using a silicon-drift detector (Bruker XFlash 5010) equipped with a thin beryllium window, then corrected and quantified [52]. Measured amounts are given in atomic percent (at.%), and, in the text, they are rounded to two significant digits.…”

Section: Coupon Preparation and Microstructural Characterizationmentioning

confidence: 99%

“…Analysis of the borehole water revealed the occurrence of a pH transient attributed to oxidation of the COx claystone after borehole drilling and before installation of the test chamber [51]. These acidic conditions were invoked to explain high rates of corrosion (up to 200 μm/a) observed for coupons initially present in the test chamber [51,52]. The present study focuses on coupons introduced in the test chamber after the acidic transient, when the pH was back to basic values.…”

Section: Introductionmentioning

confidence: 97%

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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: Coupon Preparation and Microstructural Characterizationmentioning

confidence: 99%

Section: Coupon Preparation and Microstructural Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

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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“…the other hand, β-hydroxychloride (β-Fe 2 (OH) 3 Cl) inhibits its protectiveness and favours active corrosion (coupons from step 1) [7,8]. When present simultaneously with magnetite and Fe-silicate, corrosion seems to be limited (coupons from step 3 subjected to temperature variations).…”

Section: Corrosion Processesmentioning

confidence: 99%

Corrosion processes of C-steel in long-term repository conditions

Necib

Linard

Crusset

et al. 2017

Corrosion Engineering, Science and Technology

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In the context of the French repository for high-level wastes, carbon steel (C-steel) materials are currently considered among the most cost effective and reliable materials for the prediction of long-term corrosion behaviour. An in situ experiment was conducted at the Meuse/Haute Marne underground research laboratory to investigate the corrosion behaviour of different grades of Csteel up to a maximum temperature of 85°C. C-steel coupons were placed in a two-phase test chamber containing liquid and gas emanating from the Callovo-Oxfordian host rock, at given times and for specific durations, under anoxic conditions. After their exposure in the test chamber, various characterisations were carried out. Overall, after 36 months, the results highlight a potential acidic transient. This could promote high corrosion rates of C-steel. Therefore, an alternative concept has been considered since 2014, which involves the addition of a cement-bentonite-based grout in order to buffer the possible acidic transient.

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“…Such electrochemical corrosion models have already been developed (Bataillon et al 2010;King et al 2014) and have to be coupled to RTM codes. This approach will be useful to simulate and interpret the existing laboratory experiments and also in situ results obtained recently (Necib et al 2016;Schlegel et al 2016Schlegel et al , 2018.…”

Section: A Recent Return To Modeling Experimental Resultsmentioning

confidence: 99%