Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants |
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| Authors: | H Ashassi-Sorkhabi M Moradi-Haghighi G Zarrini R Javaherdashti |
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| Institution: | (1) Electrochemistry Research Laboratory, Physical Chemistry Department, Faculty of Chemistry, University of Tabriz, Tabriz, Iran;(2) Microbiology Laboratory, Biology Department, Science Faculty, University of Tabriz, Tabriz, Iran;(3) Department of Civil Engineering, Curtin University of Technology, Perth, WA, Australia |
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| Abstract: | In this work, two novel iron oxidizing bacteria (IOB), namely Gordonia sp. MZ-89 and Enterobacter sp. M01101, were isolated from sewage treatment plants and identified by biochemical and molecular methods. Then, microbially
influenced corrosion (MIC) of carbon steel in the presence of these bacteria was investigated. The electrochemical techniques
such as potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) were used to measure the
corrosion rate and observe the corrosion mechanism. The results showed that the existence of these microorganisms decreased
the corrosion potential and enhanced the corrosion rate. Scanning electron microscopy (SEM) images revealed the ground boundary
attacks and pitting on carbon steel samples in the presence of these bacteria after polarization. Corrosion scales were identified
with X-ray diffraction (XRD). It was demonstrated that these bacteria can greatly affect the crystalline phase of corrosion
products that also confirmed by SEM results. It was inferred that these bacteria were responsible for the corrosion of carbon
steel, especially in the form of localized corrosion. |
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