Corrosion at the carbon steel⿿clay borehole water and gas interfaces at 85 °C under anoxic and transient acidic conditions

Necib, Sophia; Linard, Yannick; Crusset, Didier; Michau, Nicolas; Daumas, Sylvie; Burger, Emilien; Romaine, Alexandre; Schlegel, Michel L.

doi:10.1016/j.corsci.2016.04.039

Cited by 44 publications

(46 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Periodically, sets of coupons were retrieved for gravimetric assessment of corrosion rates, and, for some of them, replaced by new sets. 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].…”

Section: Introductionmentioning

confidence: 98%

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

Schlegel

Necib²,

Daumas³

et al. 2018

Corrosion Science

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…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%