The corrosion degradation process and semiconducting character of passivation film on the surface of zinc coating were examined in 5% (mass) NaCl solution by means of scanning electrochemical microscopy (SECM), electrochemical impedance spectroscopy (EIS) and potential-capacitance measurement. The results show that as water and ions gradually invaded into the coating, the passivation film was under slow corrosion degradation. The passivation film kept stable and provided good protection for substrate during the early immersion in corrosion electrolyte. The passivation film showed the characteristics of n-type semiconductor. With the increase of immersion time, the slope of Mott-Schottky curves dropped and the carrier density rose, reflecting that the passivation film was under slow corrosion degradation in immersion process.
引用该论文:ZHANG Jun-liang,ZHAO Qi-liang,ZHONG Qing-dong,GUO Wei. Corrosion Degradation Process and Semiconducting Behavior of Passivation Film on Zinc Coating in 5% NaCl Solution[J]. Corrosion & Protection, 2016, 37(12): 973
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