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

Abstract : Coupons of carbon steel were corroded in situ in anoxic clay porewater under slightly alkaline conditions. Sample damage was less than 1 $\mu$m 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, $\beta$-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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Michel Schlegel, Sophia Necib, Sylvie Daumas, Marc Labat, Cecile Blanc, et al.. Corrosion at the carbon steel-clay borehole water interface under anoxic alkaline and fluctuating temperature conditions. Corrosion Science, Elsevier, 2018, 136, pp.70-90. ⟨10.1016/j.corsci.2018.02.052⟩. ⟨cea-01736952⟩

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