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51313-02275-Corrosion of Linepipe Carbon Steel Influenced by a SRB Consortium Isolated from a Sour Oil Well

Picture for Corrosion of Linepipe Carbon Steel Influenced by a SRB Consortium Isolated from a Sour Oil Well
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Product Number: 51313-02275-SG
ISBN: 02275 2013 CP
Author: Faisal Alabbas
Publication Date: 2013
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This work investigates microbiologically influenced corrosion (MIC) of API 5L X52 linepipe steel by sulfate reducing bacteria (SRB) consortium. The SRB consortium used in this study were cultivated from a sour oil well in Louisiana USA. 16S rRNA gene analysis indicated that the mixed bacterial culture consortium contained three phylotypes: members of the Proteobacteria (Desulfomicrobium sp.) Firmicutes (Clostridium sp.) and Bacteroidetes (Anaerophaga sp.).The biofilm and pit morphology that developed with time were characterized with field emission scanning electron microscopy (FESEM). In addition electrochemical impedance spectroscopy (EIS) polarization resistance (Rp) and open circuit potential (OCP) were used to analyze the corrosion behavior. Through circuit modeling EIS results were used to interpret the physicoelectric interactions between the electrode biofilm and solution interfaces. The results confirmed that extensive localized corrosion activity of SRB is due to a formed biofilm and a porous iron sulfide layer on the metal surface. Energy Dispersive Spectroscopy (EDS) revealed the presence of different sulfides and oxide constituents in the corrosion products for the system exposed to SRB.

This work investigates microbiologically influenced corrosion (MIC) of API 5L X52 linepipe steel by sulfate reducing bacteria (SRB) consortium. The SRB consortium used in this study were cultivated from a sour oil well in Louisiana USA. 16S rRNA gene analysis indicated that the mixed bacterial culture consortium contained three phylotypes: members of the Proteobacteria (Desulfomicrobium sp.) Firmicutes (Clostridium sp.) and Bacteroidetes (Anaerophaga sp.).The biofilm and pit morphology that developed with time were characterized with field emission scanning electron microscopy (FESEM). In addition electrochemical impedance spectroscopy (EIS) polarization resistance (Rp) and open circuit potential (OCP) were used to analyze the corrosion behavior. Through circuit modeling EIS results were used to interpret the physicoelectric interactions between the electrode biofilm and solution interfaces. The results confirmed that extensive localized corrosion activity of SRB is due to a formed biofilm and a porous iron sulfide layer on the metal surface. Energy Dispersive Spectroscopy (EDS) revealed the presence of different sulfides and oxide constituents in the corrosion products for the system exposed to SRB.

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