The faradaic impedance method on corrosion studies. Part 2. Some practical applications

Several models are shown which simulate real situations, these are far from the ideal behaviour shown in the first part of this paper. The situation is analysed when a nonuniform distribution of alternating current density on an electrode is produced, the impedance diagram appears somewhat flattened, with the centre of the semi-circle below the real part, the faradaic resistance at the rest potential and the effect of adsorption of corrosion products on the electrode surface. Finally, some fields which will have bearing on the future of the impedance technique are discussed. (author)