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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Acknowledgments
The authors wish to thank Mr. Kuhi (Salimi Waste Management Co. president, Tabriz, Iran) and express our gratitude to Motahare Asadi (Microbiology Lab, Tabriz University) for her kind assistance in microbiological and molecular instructions.
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Ashassi-Sorkhabi, H., Moradi-Haghighi, M., Zarrini, G. et al. Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants. Biodegradation 23, 69–79 (2012). https://doi.org/10.1007/s10532-011-9487-8
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DOI: https://doi.org/10.1007/s10532-011-9487-8