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Theses

Évaluation de la corrosion de la fonte ductile influencée par les microorganismes

Abstract : Our study focused on the biocorrosion of the cast iron pipes of Saint-Gobain PAM, used for drinking water supply and sanitation. These pipes are buried in various environments (such as soils of variable composition and texture, galleries, etc.) and their protection against corrosion is provided by barrier and galvanic coatings. In some cases, these coatings are altered, leaving the cast iron exposed to environmental aggressions and in contact with microorganisms naturally present in the soil. The activity of the bacterial populations has an impact on the corrosion of steel called the "MIC" (microbial influenced corrosion). In order to know the relative contribution of microorganisms on the cast iron corrosion, bacterial metabolic groups, suspected to be involved in these reactions, have been incubated with cast iron (i.e. iron reducing (IRB), sulfate reducing (SRB) and nitrate-reducing (NRB) activities) in pure strain but also in coculture. The results were compared to purely abiotic tests. We have shown that these three metabolic groups have an impact on corrosion since they modify the composition of the native layer present on the cast iron surface. Moreover, the IRB, S. putrefaciens presented a corrosion rate of CR = 0.35 mm yr-1 against only CR = 0.05 mm yr-1 in the absence of bacteria. In addition, to get closer to real conditions, we studied the impact of bacteria from various soils on corrosion (via soil suspensions and enrichments in IRB, SRB and NRB). Based on these results, the hypothesis of the alteration of Saint-Gobain PAM ductile cast iron by microbial activities is therefore quite realistic. The knowledge that will result from these studies is essential for the development of reliable predictive models that would allow the adjustment of corrosion control measures.
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Submitted on : Thursday, March 10, 2022 - 4:34:48 PM
Last modification on : Friday, March 11, 2022 - 3:32:19 AM

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  • HAL Id : tel-03604864, version 1

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Laura Didierjean. Évaluation de la corrosion de la fonte ductile influencée par les microorganismes. Sciences du Vivant [q-bio]. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0211⟩. ⟨tel-03604864⟩

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