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1. The equivalent circuit of your model has some problems. Since you have porous coatings, you could never have pure capacitance behavior with n=1. It means this model does not represent the real coating behavior. It is suggested to change the model in order to get a more realistic model. All explanations based on the suggested models could not show the real behavior of coating. So, explanations should be re-considered again using models with physical meaning.

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2.  It seems that the aim of this paper is to protect Magnesium by having coatings. However, the impedance results indicate a little difference between coated samples and non coated ones. In general Nyquist plots (should be isotropic) are not suitable for comparison of impedance results in long term.
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3.   Impedance results are not well organized because of the absent Bode plots. It is strongly suggested to add Bode plots for all tested samples. It is difficult to analysis your modeling results without Bode plots.

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