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Potentiel de corrosion libre des aciers inoxydables en milieu marin : étude bibliographique

Abstract : Today, stainless steels immersed in natural seawater are known to present an ennoblement of their free corrosion potential, this is linked to an increase of the cathodic reaction intensity, due to the presence of a biofilm on the surface of the samples. Several studies show the role of inorganic factors which take place during immersion, like temperature, flow rate, or illumination. In order to explain the phenomenon, several hypothesis are proposed. Some authors evoke a variation of the composition of the passive film on the surface of stainless steels, resulting in a modification of the oxygen reduction. Other hypothesis are based on the presence of specific bacteria in the biofilm, like manganese oxidizing bacteria, or iron oxidizing bacteria, or some algae (diatoms), able to influence the metals behaviour and provoke the ennoblement of the free corrosion potential. Other studies are interested in the extra polymeric substances of the biofilm, and particularly some enzymes, contained in the interstitial medium, able to catalyse cathodic reactions.
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Submitted on : Tuesday, January 12, 2016 - 2:53:58 PM
Last modification on : Wednesday, July 1, 2020 - 4:30:04 PM

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V. l'Hostis, C. Dagbert, D. Féron, J. Galland. Potentiel de corrosion libre des aciers inoxydables en milieu marin : étude bibliographique. Matériaux & Techniques, EDP Sciences, 2001, 89 (5-6), pp.29-38. ⟨10.1051/mattech/200189050029⟩. ⟨hal-01254617⟩

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