Measurement of the Tafel Potential

The Tafel potential is given by a bend in the (log /) curve. According to criterion No. 4 in Table 3-3, under the conditions given in Section 3.3.3.1, it corresponds to the protection potential. 

The average protection current requirement can be conveniently determined for individual wells in an oilfield by measuring the Tafel potential. In contrast to profile measurements, internal measurements on the casing are not necessary. These measurements cannot be used to predict polarization behavior at greater depths. 

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