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09407 Cathodic Protection Efficiency in the Presence of SRB: State of the Art

Picture for 09407 Cathodic Protection Efficiency in the Presence of SRB: State of the Art
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Product Number: 51300-09407-SG
ISBN: 09407 2009 CP
Author: Lisseth Ocando, Oladis De Rincon and Matilde J. De Romero
Publication Date: 2009
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Cathodic protection (CP) is one of the corrosion control techniques mostly used with quite satisfactory results; however, where the phenomenon is microbiologically influenced corrosion (MIC), the efficiency of such control systems decreases significantly, due to a number of factors, among which the following could be mentioned: MIC can increase the kinetics of the corrosion reactions, increasing the CP current necessary to achieve a given level of polarization; the microorganism can attack pipeline coating, increasing exposed metal surface area and further increasing the CP current required to achieve the desired polarization,1 and the extracellular polymeric membrane (EPS) produced by microorganisms can generate an effect of ohmic drop2. This paper presents a review of the experiences reported worldwide related to the problems of corrosion in presence of sulfate reducing bacteria (SRB) with cathodic polarization. It also gives a review of the best criteria of polarized potential to be maintained when the problem is generated by MIC.

Keywords: Cathodic Protection, Microbiologically Influenced Corrosion, SRB, Potential Criterion
Cathodic protection (CP) is one of the corrosion control techniques mostly used with quite satisfactory results; however, where the phenomenon is microbiologically influenced corrosion (MIC), the efficiency of such control systems decreases significantly, due to a number of factors, among which the following could be mentioned: MIC can increase the kinetics of the corrosion reactions, increasing the CP current necessary to achieve a given level of polarization; the microorganism can attack pipeline coating, increasing exposed metal surface area and further increasing the CP current required to achieve the desired polarization,1 and the extracellular polymeric membrane (EPS) produced by microorganisms can generate an effect of ohmic drop2. This paper presents a review of the experiences reported worldwide related to the problems of corrosion in presence of sulfate reducing bacteria (SRB) with cathodic polarization. It also gives a review of the best criteria of polarized potential to be maintained when the problem is generated by MIC.

Keywords: Cathodic Protection, Microbiologically Influenced Corrosion, SRB, Potential Criterion
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