Abstract
In this work, the corrosion behavior of carbon steel AISI 1020 was evaluated in artificial seawater in the presence of mixed sulfate-reducing bacteria (SRB) culture isolated from the rust of a pipeline. The corrosion evaluation was performed by electrochemical techniques (open circuit potential (E ocp ), polarization curves and electrochemical impedance spectroscopy (EIS)), while the formation of a biofilm and corrosion products were observed by scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). The presence of SRB in the medium shifted the open circuit potential to more positive values and increased the corrosion rate of the steel. Electrochemical and morphological techniques confirmed the presence of a biofilm on the steel surface. EDS spectra data showed the presence of sulfur in the corrosion products. After removing the biofilm, localized corrosion was observed on the surface, confirming that localized corrosion had occurred. The biogenic sulfide may lead to the formation of galvanic cells and contributes to cathodic depolarization. Keywords : sulphate-reducing bacteria, biofilm formation; carbon steel, electrochemical impedance spectroscopy, morphological characterization.
Highlights
Corrosion, in its various forms, can cause damages to bridges, ships, platforms and pipelines
It has been estimated that approximately 20 % of corrosion cost is due to microbiologically influenced corrosion (MIC), and a significant part of this biocorrosion process can be induced by sulphate-reducing bacteria (SRB) [1, 2]
Biocorrosion is an electrochemical process of metal dissolution initiated or accelerated by bacteria and other microorganisms through their metabolic activities [3]
Summary
In its various forms, can cause damages to bridges, ships, platforms and pipelines. Researchers are investigating the formation of biofilms on the corrosion of carbon steels using various species of SRB and microbial consortia [12, 13, 14, 15]. In these cases, artificial seawater is the main incubation medium for these bacteria [16]. The aim of this study was to investigate the electrochemical and morphological impacts of a mixed culture of SRB, obtained directly from a real marine environment, in the MIC process on carbon steel in an artificial saline medium using a longer experimental time
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