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08504 Evaluation of the Cathodic Protection Criteria in the Presence of SRB

Picture for 08504 Evaluation of the Cathodic Protection Criteria in the Presence of SRB
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Product Number: 51300-08504-SG
ISBN: 08504 2008 CP
Author: Matilde Romero, Oladis Rincon, Monica Sanz, Brendy Rincon, Lisseth Ocando, and William Campos
Publication Date: 2008
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Cathodic polarization has been established as the most effective control system of corrosion in buried or submerged pipelines; this happens even in presence of sulfate reducing bacteria (SRB), only if the polarize potential reaches values of -0.950 V vs Cu/CuSO4. The purpose of this investigation was to evaluate the effectiveness of cathodic polarization of steel API 5L 42X exposed to a mixed SRB strain isolated from a brackish water lake, using microbiological, electrochemical and microscopic analysis. The experimental design consisted in performing diverse studies using the cell developed by Devanathan and Starchursky and varying the applied potential from -1.3 to -2.1 V vs. Cu/CuSO4, during exposure time (72 hours). Different blank test were done without polarization to compare and observe its effects. The results obtained demonstrated that a polarize potential of -0.950 V vs Cu/CuSO4 is not enough to protect the steel in environments with SRB, even when polarized potentials equal to -1.37 V vs Cu/CuSO4 were reached on the metallic surface.
Cathodic polarization has been established as the most effective control system of corrosion in buried or submerged pipelines; this happens even in presence of sulfate reducing bacteria (SRB), only if the polarize potential reaches values of -0.950 V vs Cu/CuSO4. The purpose of this investigation was to evaluate the effectiveness of cathodic polarization of steel API 5L 42X exposed to a mixed SRB strain isolated from a brackish water lake, using microbiological, electrochemical and microscopic analysis. The experimental design consisted in performing diverse studies using the cell developed by Devanathan and Starchursky and varying the applied potential from -1.3 to -2.1 V vs. Cu/CuSO4, during exposure time (72 hours). Different blank test were done without polarization to compare and observe its effects. The results obtained demonstrated that a polarize potential of -0.950 V vs Cu/CuSO4 is not enough to protect the steel in environments with SRB, even when polarized potentials equal to -1.37 V vs Cu/CuSO4 were reached on the metallic surface.
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