Evolution of the protective mechanisms of zinc-rich paints during atmosphere exposure

Abstract

The results of weathering and electrochemical tests were integrated in order to study the evolution of the protective mechanisms of zinc-rich paints (ZRP) over time. After three years of atmospheric exposure, some of the tested ZRP coatings still maintained a great part of their original capacity for providing cathodic protection. The paints formulated with the ethyl silicate vehicle stand out in this respect. On the other hand, an important improvement of the barrier effect is shown, especially with the paints formulated with the epoxy-polyamide vehicle.