Abstract
In this study, the electrochemical corrosion behavior of copper was investigated in seawater collected from four different marine zones of Agadir coastal. These zones are different by the degree of pollution in order to study the effect of this pollution on the copper corrosion, especially the microbial pollution by sulfate reducing-bacteria (SRB). So, to prove this relationship, the microbiological analyses researching the SRB are realized. In parallel, the electrochemical impedance measurement and atomic absorption analysis are established to compare the microbiological evolution cycles with the electrochemical behavior of copper during the immersion period. In the results, we found a good correlation between the growth cycle of marine sulfate-reducing bacteria and the copper corrosion rate by the sulfur and extracellular polymeric substances (EPS) produced as bacteria metabolites. Additionally, this corrosion rate depends on the immersed time: it is maximal after the first or second month depending on the marine zone.
Highlights
Copper is a metal of wide utilization due to its good electrical conductivity and resistance to corrosion, whichHow to cite this paper: Elmouaden, K., Jodeh, S., Chaouay, A., Oukhrib, R., Salghi, R., Bazzi, L. and Hilali, M. (2016) Sulfate-Reducing Bacteria Impact on Copper Corrosion Behavior in Natural Seawater Environment
The anaerobic biocorrosion is always associated with the presence of the malodors of hydrogen sulfur produced by sulfate-reducing bacteria [8] [9]
The Open circuit potential (OCP) values associated to copper shifted to negative ones, but there are some differences which appear by increase in the immersed time
Summary
Copper is a metal of wide utilization due to its good electrical conductivity and resistance to corrosion, whichHow to cite this paper: Elmouaden, K., Jodeh, S., Chaouay, A., Oukhrib, R., Salghi, R., Bazzi, L. and Hilali, M. (2016) Sulfate-Reducing Bacteria Impact on Copper Corrosion Behavior in Natural Seawater Environment. Copper forms a resistant coating of corrosion products named patina, which protects the metal from the deterioration. These applications of copper happened in atmospheric conditions [2]-[6]. The anaerobic biocorrosion is always associated with the presence of the malodors of hydrogen sulfur produced by sulfate-reducing bacteria [8] [9] These bacteria have enzymatic systems witch participate in different steps of corrosion process. The layer of corrosion products formed under immersion conditions in seawater shows a poor protection to the metal [17]. The biofilm developed by D. desulfuricans at the metal surface accumulates with exposure time [18], and the biofilm heterogeneities are responsible of local gradient differences and extension of the active sites where corrosion processes take place [19] [20]
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