Title of article :
Electrochemical Impedance Spectroscopy and Surface Studies of Steel Corrosion by Sulphate-Reducing Bacteria
Author/Authors :
SAHRANI, FATHUL KARIM Universiti Kebangsaan Malaysia - Faculty of Science and Technology - Marine Ecosystem Research Centre (EKOMAR), Malaysia , ZAHARAH, IBRAHIM Universiti Teknologi Malaysia - Faculty of Bioscience and Bioengineering - Deparment of Biology Industry, Malaysia , MADZLAN, AZIZ Universiti Teknologi Malaysia - Faculty of Science - Department of Chemistry, Malaysia , ADIBAH, YAHYA Universiti Teknologi Malaysia - Faculty of Bioscience and Bioengineering - Deparment of Biology Industry, Malaysia
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 of culturing 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
Keywords :
Electrochemical impedance spectroscopy , microbiologically influenced corrosion , sulphate , reducing bacteria
