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Influence des bactéries sulfurogènes naturelles sur la formation du dépôt calco-magnésien

Abstract : The application of the cathodic protection, as well as the formation of the Ca, Mg deposit that results, are currently very defined but solely in marine environment exempt of bacteria, as the open ocean. The investigation in natural sea water, in presence of sulphogenic bacteria, achieved on long terms (two months) are infrequent. The calcareous deposit evolution is mainly function of different paramètres : the cathodic protective potential, the application time of this one, the yield Mg/Ca of the middle, its microbial load and the organic matter presence dissolved. In artificial sea water, the deposit now presents some features known, so magnesium appears solely for very cathodic potentials, returning the pH favorable to its precipitation. As for the calcium, it can be formed down to weaker pH. However, for kinetics reasons, magnesium can appear earlier. In sea water to weak bacterial pollution, magnesium appears little for potentials cathodic since –800 mV/ECS. However, more the application time increases (until two months) more the quantity of calcium increases and cover magnesium. In sea water where the bacterial concentration (at least 108 Bacteria reducing sulphate and thiosulphate.ml-1) is important, the features of the deposit remain the same. Only the compactness and the density of the deposit are different : they increase in presence of bacteria. This survey shows that : the bacterial presence and more especially the bacteria sulfurogènes, the chemical composition of the sea water and the concentration in dissolved oxygen, are factors influencing the formation and the evolution of the deposit calcareous more or less.
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Submitted on : Friday, January 8, 2016 - 4:09:57 PM
Last modification on : Wednesday, July 1, 2020 - 4:30:04 PM

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C. Godart, C. Dagbert, J. Galland. Influence des bactéries sulfurogènes naturelles sur la formation du dépôt calco-magnésien. Matériaux & Techniques, EDP Sciences, 2002, 90 (7-8), pp.11-18. ⟨10.1051/mattech/200290070011⟩. ⟨hal-01253096⟩

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