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51312-01233-Synergistic Effect of Sulphate-Reducing Bacteria and CO2 on the Corrosion of Carbon Steel in Synthet

Picture for Synergistic Effect of Sulphate-Reducing Bacteria and CO2 on the Corrosion of Carbon Steel in Synthet
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Product Number: 51312-01233-SG
ISBN: 01233 2012 CP
Author: Antonio J. De Turris
Publication Date: 2012
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In this study the influence of sulphate reducing bacteria (SRB) and carbon dioxide (CO2) on the corrosivity of synthetic produced water (SPW) has been investigated. Experiments were carried out using rotating cage as per ASTM G202 procedure. During the experiments the pH planktonic bacterial count as well as concentrations of iron calcium and magnesium were measured periodically. After the experiment sessile bacterial count corrosion products and surface morphology were investigated using X-ray diffraction scanning electron microscope optical microscope and laser profilometer. CO2 concentrations higher than 10% v/v in gas phase decreased the pH of SPW to 4.2. Under this condition neither planktonic SRB growth nor sessile growth was observed and the corrosion rate was uniform. Both planktonic and sessile bacteria were active when the CO2 concentration was lower than 10% v/v in the gas phase. Under this condition non-protective iron sulfide (mackinawite) layer formed on the surface and small pits formed over the entire surface of the metal. Keywords: Mackinawite Microbiologically Induced Corrosion Sulphate-Reducing Bacteria produced water CO2 effect.
In this study the influence of sulphate reducing bacteria (SRB) and carbon dioxide (CO2) on the corrosivity of synthetic produced water (SPW) has been investigated. Experiments were carried out using rotating cage as per ASTM G202 procedure. During the experiments the pH planktonic bacterial count as well as concentrations of iron calcium and magnesium were measured periodically. After the experiment sessile bacterial count corrosion products and surface morphology were investigated using X-ray diffraction scanning electron microscope optical microscope and laser profilometer. CO2 concentrations higher than 10% v/v in gas phase decreased the pH of SPW to 4.2. Under this condition neither planktonic SRB growth nor sessile growth was observed and the corrosion rate was uniform. Both planktonic and sessile bacteria were active when the CO2 concentration was lower than 10% v/v in the gas phase. Under this condition non-protective iron sulfide (mackinawite) layer formed on the surface and small pits formed over the entire surface of the metal. Keywords: Mackinawite Microbiologically Induced Corrosion Sulphate-Reducing Bacteria produced water CO2 effect.
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