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Electrochemical impedance spectroscopy and surface studies of steel corrosion by sulphate-reducing bacteria

Ibrahim, Zaharah and Sahrani, Fathul Karim and Aziz, M. A. A. and Yahya, Adibah (2009) Electrochemical impedance spectroscopy and surface studies of steel corrosion by sulphate-reducing bacteria. Sains Malaysiana , 38 (3). pp. 359-364. ISSN 01266039

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Abstract

Sulphate-reducing bacteria (SRB), implicated in microbiologically influenced corrosion were isolated from the deep subsurface at the vicinity of Pasir Gudang, Johor, Malaysia. Electrochemical impedance spectroscopic (EIS) study was carried out to determine the polarization resistance in various types ofculturing solutions, with SRB1, SRB2, combination of SRB1 and SRB2 and without SRBs inoculated (control). EIS results showed that in the presence of SRB1, SRB2 and mixed culture SRB1 and SRB2, polarisation resistance values were 7170, 6370 and 7190 ohms respectively compared to that of control, 92400 ohm. X-ray analysis (EDS) of the specimens indicated high sulphur content in the medium containing SRBs. Localized corrosion was observed on the metal surface which was associated with the SRB activity.

Item Type:Article
Uncontrolled Keywords:electrochemical impedance spectroscopy, microbiologically influenced corrosion, sulphate-reducing bacteria
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:13815
Deposited By: Ms Zalinda Shuratman
Deposited On:26 Aug 2011 04:47
Last Modified:26 Aug 2011 04:47

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