Communication Dans Un Congrès Année : 2022

Influence of sargassum on marine corrosion of carbon and stainless steels immersed in seawater on French West Indies Coast

Résumé

Since 2011, the washed-up Sargassum are a concern for Caribbean region. These golden tides cause some environmental damages, and results significant negative impacts on health and economical costs. In this work, we studied the behaviour of carbon steel and stainless steel immerged on three sites more or less impacted by the presence of sargassum algae on the coasts of Martinique (French Antilles). Another experiment makes, at laboratory and on site (more and less impacted sites), to determine the influence of microorganisms with three conditions (sterile, non-sterile, non-sterile with sargassum). The comparative study of the corrosion of steels was carried out through structural (SEM, confocal microscopy) and electrochemical characterizations (EVT, PEIS and LPR) and bacterial community analysis. Significant differences of corrosion rates and surface morphologies were observed for the three studied sites. The more advanced surfaces degradation of metals observed at 7 days for carbon steel DC01 (2,2 ± 0,24 mm/year) and at 60 days for stainless steel 304L (0,5 ± 0,67 mm/year). For laboratory experiment, at 15 days, we observed similar trends with an increase of potentials for all conditions and sites for DC01 (0 days: -750 ± 15 mV; 15 days: -711 ± 6,38 mV) and for stainless steel 316L (0 days: -50 ± 10 mV; 15 days: 70 ± 30 mV). However, we have significant variations between samples at laboratory and at site. To more aggressive site there is an increase of potential for DC01 and a decrease of potential for 316L (-260 ± 63 mV). That is can be correlated with the establishment of biofilm for 316L (Unsal and al.,2016). An attempt was made to link its results with certain chemical parameters characteristic of the water at the sites studied and the quantity and state of decomposition of the Sargassum algae present.

Mots clés

Fichier non déposé

Dates et versions

hal-04722368 , version 1 (05-10-2024)

Identifiants

  • HAL Id : hal-04722368 , version 1

Citer

Diana Bénuffé, Fatima Radouani, Maxence Quemener, Olivia Ozier, Fabienne Fay, et al.. Influence of sargassum on marine corrosion of carbon and stainless steels immersed in seawater on French West Indies Coast. XXX International Materials Research Congress, Aug 2022, Cancun, Mexico, Mexico. ⟨hal-04722368⟩
124 Consultations
0 Téléchargements

Partager

  • More