I am adding tafel curve of different coatings kindly specify the these three regions in the tafel curve ....in the given spectra how many regions we can observe ?
as you surely known, the EIS technique is a very useful method used for monitor coated systems during accelerated tests involving, for example, the increase of temperature of the electrolyte or scribing the surface of the coating, exposing a portion of the metal surface to an aggressive environment or environmental cycle.
For more details, please see the source:
Evaluating organic coating performance by EIS: Correlation between long-term EIS measurements and corrosion of the metal substrate