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Ô­»°ÊÇÕâÑùµÄ£ºThe authors say that they do not take the inductive loop into account because they only study the "the coating and substrate as a unit to resist the acid" and not "the strong interaction between the coating and and substrate" . It does not justify to use an EEC with a single (distributed) time constant. How many points are you using to fit to the proposed EEC?. If you use the whole impedance spectrum an underestimated value for Rct will be obtained. From a visual inspection of the Nyquist plot, I think that Rct value (=957 ohms/cm^2) is underestimated. You should try to fit the experimental impedance data using the EEC: Rs+[CPE//(Rct+(C//R))] where R and C are negative values (R<0 and C<0) modelling the inductive part. "+" denotes series and "//" denotes parallel. A more exact value for Rct will be obtained.

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