CONCERNING THE USE OF THE KRAMERS-KRONIG TRANSFORMS FOR THE VALIDATION OF IMPEDANCE DATA

The increasing application of electrochemical impedance spectroscopy (EIS) to the study of a variety of corrosion phenomena makes it necessary to define means of validation of such data. The application of the Kramers-Kronig transforms to a number of typical corrosion systems has shown that problems exist with their use for validation of experimental impedance data. Even for theoretical data no agreement with the transforms is observed if the impedance data have not reached their dc limit within the frequency range used for the transform.