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51314-4171-Induced Polarization (IP) of Soil as a Source of Error in Cathodic Protection Potential Measurements

Picture for Induced Polarization (IP) of Soil as a Source of Error in Cathodic Protection Potential Measurements
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Product Number: 51314-4171-SG
ISBN: 4171 2014 CP
Author: Rob Wakelin
Publication Date: 2014
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It is generally accepted that a buried steel structure cannot be cathodically polarized to a potential much more electronegative than -1200 mVCSE due to the limiting potential encountered with the electrolysis of water. Nevertheless cathodic protection data obtained in the field often include off-potential measurements significantly more electronegative than would seem possible in theory. While this might usually be explained as a failure to interrupt all influential sources of cathodic protection current it is proposed that polarization of the soil itself in some cases may produce such errors.Time-domain induced polarization (IP) is a well-established geophysical survey technique in which the polarization characteristics of the soil are measured as a means of identifying mineral deposits. This paper discusses the theory of the IP technique and suggests how the polarization of certain soils might lead to off-potential measurements which are excessively electronegative. Off-potential data from several case studies are presented to support this theory.
It is generally accepted that a buried steel structure cannot be cathodically polarized to a potential much more electronegative than -1200 mVCSE due to the limiting potential encountered with the electrolysis of water. Nevertheless cathodic protection data obtained in the field often include off-potential measurements significantly more electronegative than would seem possible in theory. While this might usually be explained as a failure to interrupt all influential sources of cathodic protection current it is proposed that polarization of the soil itself in some cases may produce such errors.Time-domain induced polarization (IP) is a well-established geophysical survey technique in which the polarization characteristics of the soil are measured as a means of identifying mineral deposits. This paper discusses the theory of the IP technique and suggests how the polarization of certain soils might lead to off-potential measurements which are excessively electronegative. Off-potential data from several case studies are presented to support this theory.
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