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The Corrosion Behavior of Carbon Steel in Sulfide Aqueous Media at 30 degrees C

Abstract : In this paper, we studied the effect of sulfide ions on the corrosion behavior of carbon steel to simulate the geological disposal of high-level radioactive waste. In geological storage conditions, sulfidogenic environment was sustained by sulfate-reducing bacteria. Corrosion tests were conducted in systems in a controlled atmosphere of 5% H-2/N-2. Batch experiments were conducted at 30A degrees C for 1 month with steel coupons immersed in Na2S solutions. The structural characterization of the corrosion products was investigated by scanning electron microscope/energy dispersive x-ray spectroscopy, confocal micro-Raman spectrometry, and x-ray diffraction. In the absence of sulfide ion, a magnetite (Fe3O4) corrosion product layer was formed on steel surface while in the presence of sulfide ions we observed the formation of a poorly crystallized irons sulfide at low-sulfide concentration (1 mg/L) and a solid adherent pyrrhotite layer at higher sulfide concentration (5-15 mg/L). The strong drop in steel corrosion rate with sulfide concentration was revealed and related to the formation of well-crystallized pyrrhotite.
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Submitted on : Tuesday, September 29, 2015 - 5:01:04 PM
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Yassine El Mendili, Abdesselam Abdelouas, Jean-François Bardeau. The Corrosion Behavior of Carbon Steel in Sulfide Aqueous Media at 30 degrees C. Journal of Materials Engineering and Performance, Springer Verlag/ASM International, 2014, 23 (4), pp.1350-1357. ⟨10.1007/s11665-014-0879-x⟩. ⟨hal-01206908⟩



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