Abstract A review is presented of the theoretical analysis of AC impedance data, with particular reference to corrosion. This review includes a discussion of charge transfer processes at planar surfaces, diffusional effects, electrodissolution of metals, passivity, porous systems, and an analysis of how AC impedance spectroscopy (ACTS) can be used to measure corrosion rate. Finally, the application of Kramers- Kronig transforms in impedance analysis is briefly discussed, with reference to the use of these transforms to validate experimental impedance data.
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