Measurement models have been applied to electrochemical impedance data collected at the corrosion potential for a copper disk rotating in alkaline and acid aerated 0.5 M chloride solutions. Several applications of measurement models for the interpretation of experimental impedance data are demonstrated. Corrosion is inherently a non-stationary process, and non-stationary behavior associated with corrosion frequently influences impedance data. If data can be shown to be consistent with the Kramers-Kronig relations, non-stationary influences can be neglected. Measurement models provide a quantitative method for identifying the portion of an impedance spectrum that is consistent with the Kramers-Kronig relations and can, therefore, be interpreted in terms of pseudo-steady-state models. Measurement models also provide a very sensitive means of interpreting impedance spectra in terms of the effects of physical parameters such as immersion time and disk rotation speed.

Subject
Confidence intervals, Structures, Impedance, Chloride solutions, Acidity, Impedance measurements, Experimental data, Corrosion modeling, Electrochemical data, Immersion, Copper, Electrodes, Corrosion potential
Keywords:
Impedance, Measurement Model, Copper, Chloride, Kramers-Kronig Relations
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1992
Association for Materials Protection and Performance (AMPP)
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