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The corrosion resistance of an electroplated (EP) Zn coating whose surfacewas chemically etched to produce surface defects (pores) is investigated inthis work. Impedance and DC polarisation measururements were employed to studythe behaviour of such coating in various corrosive media (NaCl, NaOH and rainwater). Four different faradaic relaxation processes were clearly revealed indifferent NaCl concentrations (from 0.1M to 1M). In the most concentratedsolutions at least three relaxation processes at low frequencies (LF) appearedand were related to zinc deposition and dissolution. At lower concentrationsand depending on the pH, only one process was observed. The charge transferresistance (Rct) and the corrosion current (Icorr) were practically stable inthe pH range 5 to 10. In deaerated NaCl 0.1M, the EIS diagrams showed twotime-constants at very close frequencies. From the EIS diagrams the porousnature of the coating was highlighted and showed that the dissolutionmechanisms occurred at the base of the pores.

On the Corrosion Resistance of Porous Electroplated Zinc Coatings in Different Corrosive Media