SEDL / STP / STP1188-EB / STP18060S

Impedance Spectra Calculated from Model Polarization Curves

Bertocci, U
Corrosion Group, Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD

Ricker, RE
Corrosion Group, Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD

Pages: 14    Published: Jan 1993

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Abstract

Once steady state polarization curves have been calculated from a model based on a description of the kinetics of the electrode processes, all the necessary elements for computing the impedance spectra at any potential within the range used for the polarization curves are available. This paper described the basic equations necessary for this purpose, and develops, as an example of interest in corrosion studies, the case in which both oxygen reduction and hydrogen evolution occur as cathodic processes. The effect of changes of pH at the metal surface are examined, and comparisons between calculated curves and experimental data are presented.