Some Errors in Linear Polarization Measurements and Their Correction
- 1 March 1974
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 30 (3) , 92-96
- https://doi.org/10.5006/0010-9312-30.3.92
Abstract
The errors due to the use of the approximation Icorr′ = B′ΔI, where B′ depends on anodic and cathodic Tafel slopes, in commercial corrosion current meters is shown to be due to the nonlinearity of the current-potential curve in the vicinity of the corrosion potential. These errors are calculated for various combinations of Tafel slopes. It is proposed to use the relationship Icorr = κΔI, where κ depends on Tafel slopes, sign, and magnitude of polarization. The values of κ are tabulated for various combinations of Tafel slopes and polarization of +10 and −10 mV. The proposed procedure leads to correct values of corrosion currents independent of the degree of nonlinearity of the polarization curve.Keywords
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