March 2012, Vol. 239 No. 3


Steel Pipe Native Potentials In Soils Affect CP Criteria

Soil resistivity, corrosivity and steel native potentials in soils are interrelated. A chart was developed in this work to quantitatively map the rule-of-thumb relationship between steel native or rest potentials and soil resistivity. This chart was validated with available literature data from independent sources and can be used to provide a rough estimate of the magnitude of polarization applied on buried steel pipes for a given soil resistivity and an off-potential measured. Polarization provides a more direct measure (than an off-potential) on the magnitude of corrosion rate reduction. The chart shows that meeting the -850 mV, -750 mV and -650 mV (vs. Cu/CuSO4) off-potential

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