Electrochemical impedance spectroscopy (EIS) was used to investigate 55% Al-Zn coated with different thin polymer coatings (≈ 1 μm) containing a passivating inhibitor (Cr[VI]) after exposure to a sodium chloride (NaCl) solution for variable times. Impedance data were analyzed using a model developed previously. Investigation of the effects of polymer layer thickness, chromate concentrations, and polymer particle dimensions revealed the different aspects of the protective principle of this new type of thin-film coating on 55% Al-Zn-coated sheet steel. Evolution of the coating behavior over time was studied in depth.

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