51312-01140-Effects of Sulfate Reducing Bacteria on the Corrosion of X-65 Carbon steel pipeline

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Product Number: 51312-01140-SG

ISBN: 01140 2012 CP

Author: Faisal Alabbas

Publication Date: 2012

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Effects of Sulfate Reducing Bacteria on the Corrosion of X-65 Carbon steel pipeline Faisal M. Al-Abbas Dr. Tony Kakpovbia Saudi Aramco Dhahran Saudi Arabia and Arshad Bajvani Gavanluei Dr. David Olson Dr. Brajendra Mishra and Dr. John Spear Colorado School of Mines Microbiologically Influenced Corrosion (MIC) by Sulfate Reducing Bacteria (SRB) on API 5L grade X65 carbon steel coupons used was investigated. SRB bacteria were isolated and cultivated from corrosion products collected from Arabian Medium crude oil pipeline. The corrosion behavior of carbon steel coupons exposed to different media with and without SRB media was characterized by Electrochemical Impedance Spectroscopy (EIS) linear polarization resistance (Rp) and open circuit potential (OCP) . The biofilm and pit morphology that developed with time were characterized by using scanning field emission scanning electron microscopy (FESEM) and scanning electron microscope (SEM). EIS spectra displayed one time constants for the sterilized growth media. The time constant was related to an outer layer formed due to the precipitates of chlorides and organic compounds from the growth media in addition to the corrosion products. The biofilm formation by SRB promotes the corrosion rate and hence a diffusion controlled process appeared as a result of sulfide-base iron corrosion product. Corrosion products were characterized by X-ray diffraction (XRD). XRD identified the presence of different sulfide and oxide constituents that included FeS Mackinawite and FeO(OH) in the corrosion products. Key words: Carbon steel API 5L X65 Microbiologically Influenced Corrosion (MIC) Sulfate Reducing bacteria biofilm and iron sulfide