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1, You analyse the polarization curve with the Stern and Geary formula which corresponds to an anodic and a cathodic reaction following a Tafel law. In presence of a coating the dc current is not following a Tafel law.
2£¬The presentation of the impedance data in Nyquist plot is not correct. The Z\' and Z" axes of the Nyquist plot should have exactly the same scales; it is also necessary to add some characteristics frequencies on the diagrams.
3£¬The Warburg impedance is a part of the faradaic impedance, then W must be in series with the charge transfer resistance, W+Rct must be in parallel with the double layer capacitance.
4£¬In the second equivalent circuit I do not understand how CPE2 could be in direct contact with the metal. It will be clearer if the equivalent circuit and the different layers are on the same scheme.
5£¬In order to evaluate the value of the double layer capacitance represented by a CPE, I suggest to use the Brug¡¯s formula (G.J. Brug, A.L.G. van den Eeden, M. Sluyters-Rehbach, and J. H. Sluyters, J. Electroanal. Chem. 176(1984) 275).  
6£¬In table 3 you gave the results with 5 figures, what is the accuracy of your measurements.
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