Four different methods for determining the polarization resistance R from impedance data are discussed. These methods are suitable for online corrosion monitoring. Their use is illustrated for iron in tapwater and in neutral, aerated Na2SO4 containing various inhibitors. R ‐values obtained with the CIRFIT‐method are compared with R which is obtained from a linear sweep through Ecorr. The integration method has the advantage of computation speed.
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Mansfeld et al. (1983) studied this question.
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