Sulfate-Reducing Bacteria Impact on Copper Corrosion Behavior in Natural Seawater Environment

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.

Quorum Sensing and the Use of Quorum Quenchers as Natural Biocides to Inhibit Sulfate-Reducing Bacteria

“…This is likely due to poor oxygen diffusion throughout the biofilm that results in anoxic zones, in turn favoring SRB growth. The presence of SRB in the biofilm structure subsequently leads to localized biocorrosion events [36,37,38]. Furthermore, attachment on surfaces as facilitated by biofilm formation would allow direct contact between outer membrane proteins or electro-conductive nanowires and the metal surface [39,40].…”

Microstructure and phase composition of bronze Montefortino helmets discovered Mediterranean seabed to explain an unusual corrosion

“…At the same time the excretion of extracellular polymeric substances (EPS) improve the dissolution. The biofilm developed by D. desulfuricans at the metal surface accumulates with exposure time forming a poor protection patina 44 . Two examples, were the sulphides are present in corroded bronze, came from two quite recent wrecks, Wasa (1628 in Stockholm Habour) 45 and Mary Rose (1545 near Portsmouth) 46 .…”

Shatavari (Asparagus Racemosus) as green corrosion inhibitor of aluminium in acidic medium

“…Presence of heteroatom's, polar functional groups and π-electrons as active centers in a particular compound makes it an effective corrosion inhibitor [13][14][15] because these hetero atoms or π-electrons facilitate electronic interactions between metal and inhibitor which in turn helps in the adsorption of inhibitor onto the metal surface [16]. Increase in environmental awareness has raised the demand of green, non-toxic, cheap and environment friendly corrosion inhibitors [17][18][19] …”