Carbon steel corrosion induced by sulphate-reducing bacteria in artificial seawater: electrochemical and morphological characterizations

Carbon steel corrosion induced by sulphate-reducing bacteria in artificial seawater: electrochemical and morphological characterizations

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 poten...

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Bibliographic Details
Published in:Matéria Vol. 21; no. 4; pp. 987 - 995
Main Authors: Paula, Mariana Silva de, Gonçalves, Márcia Monteiro Machado, Rola, Monick Alves da Cruz, Maciel, Diana José, Senna, Lilian Ferreira de, Lago, Dalva Cristina Baptista do
Format: Journal Article
Language:English
Published: Rede Latino-Americana de Materiais 01-12-2016
Subjects:
CONSTRUCTION & BUILDING TECHNOLOGY
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
morphological characterization
biofilm formation
sulphate-reducing bacteria
electrochemical impedance spectroscopy
carbon steel
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Summary: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 (Eocp), 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.
ISSN:1517-7076
1517-7076
DOI:10.1590/s1517-707620160004.0091