Cuprous ions influence on the biocorrosion of a carbon steel in the presence of Sulphate Reducing Bacteria marine biofilm - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Regional Studies in Marine Science Année : 2024

Cuprous ions influence on the biocorrosion of a carbon steel in the presence of Sulphate Reducing Bacteria marine biofilm

Résumé

The influence of marine sulphate reducing bacteria (SRB) biofilm on naval carbon steel corrosion in seawater was studied in the presence or not of cuprous ions as polluting agent. The optical density measurement showed that a concentration of 15 mg L−1 in cuprous ions can cause a significant slowdown in the proliferation of planktonic bacteria. However, electrochemical impedance results indicated that there was still bacterial activity on the metal substrate. Indeed, biofilm was grown on the surface of material in seawater containing SRB. Initially, an increase in the charge transfer resistance values due to the iron sulphide layer formed by the bacteria precipitation reactions was recorded during growth phase. This film acts as a barrier, preventing further oxidation of the underlying metal; then, the localized breakdown of iron sulphide layer generates an acceleration of corrosion. Similar behaviour occurs in the presence of sulphate reducing bacteria flora with 15 mg L−1 cuprous ions. In order to protect themselves when the seawater media containing toxic metals, sulphate reducing bacteria embed into clusters and increase the production of extracellular polymeric substances on materials. Sulphur was present on specimens in both cases and EDS spectra revealed the formation of iron sulphide. After the removal of biofilm, carbon steel surfaces exhibited a plenty of micropits scattered on the entire surface compared to the surface immersed in the seawater without bacteria. Previous article in issue
Fichier sous embargo
Fichier sous embargo
0 0 16
Année Mois Jours
Avant la publication
dimanche 26 mai 2024
Fichier sous embargo
dimanche 26 mai 2024
Connectez-vous pour demander l'accès au fichier

Dates et versions

hal-04327430 , version 1 (02-02-2024)

Identifiants

Citer

Souad Belkaid, Dalila Mansour, Farida Laadjal Salah, Abdeltif Amrane. Cuprous ions influence on the biocorrosion of a carbon steel in the presence of Sulphate Reducing Bacteria marine biofilm. Regional Studies in Marine Science, 2024, 69, pp.103307. ⟨10.1016/j.rsma.2023.103307⟩. ⟨hal-04327430⟩
31 Consultations
1 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More