Influence of different aggressive media on the protective behaviour of zinc rich paints
Keywords:Zinc rich paints, Pollutants, Electrochemical impedance spectroscopy, Zinc corrosion, Atmospheric corrosion
The aim of the present work is to determine the influence that different atmospheric agents have in steel protection by zinc rich paints based on inorganic silicate binder. The presence of pollutants in the atmosphere has been simulated by periodical deposition of sulphate and/or chloride solutions on the surface of the samples. With the aim of determining the validity of immersion tests, usually used in these types studies, the samples were kept in a controlled atmosphere at 20°C and 60% RH. These exposition conditions could represent a relative dry atmosphere allowing the zinc corrosion. Electrochemical impedance spectroscopy was employed to follow the time evolution of the studied paints. The corresponding impedance spectra were modeled using an electrical equivalent circuit approach. This methodology allows establishing that pollutants as well as weathering conditions define the protecting mechanism of these zinc rich paints. The results show a fast evolution towards a barrier-type protecting mechanism.
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How to Cite
Abreu, C. M., Izquierdo, M., Nóvoa, X. R., Pérez, C., & Sánchez, A. (1999). Influence of different aggressive media on the protective behaviour of zinc rich paints. Revista De Metalurgia, 35(3), 182–189. https://doi.org/10.3989/revmetalm.1999.v35.i3.622
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