Current trends in the modification of zinc-filled polymer coatings

Abstract

Zinc-filled polymer coatings and primer formulations are among the most common and well-proven methods for long-term anticorrosive protection of critical metal structures and equipment. These coatings are successfully used both for the protection of internal surfaces of equipment and pipelines and for external protection. The main ways to modify zinc-filled coatings (ZFC) include modification of the zinc filler, modification of the polymer base, and the use of diverse active additives. Various methods of modifying the zinc filler are considered, including modification of the zinc alloy composition, surface modification of zinc particles, and the use of particles with various shapes and sizes – from nanoparticles to flake-shaped pigments. An analysis of the incorporation of various electrochemically active additives into ZFC, including nanoscale carbon-containing additives (carbon nanotubes, graphene and graphene oxide), as well as nanoparticles based on montmorillonite and layered double hydroxides, is performed. The experience in the incorporation of activators of zinc particles and selective modifiers and corrosion inhibitors along with conductive polymers as additives is considered. Approaches to the modification of the polymer base of ZFC are considered, taking into account their use in multi-layer coatings, including the combinations with layers of inert insulating coatings and water-borne polymers.