Vliv čistoty povrchu substrátu na korozní odolnost nátěrového systému

Abstract

The present dissertation focuses on the topical issue of the effects of substrate surface purity on the corrosion resistance of a coating system. The theoretical part of the dissertation sums up current knowledge of the effects of surface treatment of the substrate and its purity on resistance to corrosion attack before and after the application of a coating system. The purity of the substrate surface is closely associated with the presence of dust particles stuck on the surface, which react, in particular, with moisture. Considering the fact that preference is generally given to environmentally-friendly and water-dilutable coatings, it can be assumed that dust particles stuck on the substrate surface, when reacting with water, may show hydrophilic or hydrophobic behaviour by involving the principle of flotation. Furthermore, issues relating to the coating systems containing nanoparticles, which exert influence not only on the properties such as coloration, but mainly on the corrosion resistance of the coatings, are presented here. The experimental part of the dissertation gives focus to the verification of the effects of hydrophobic and hydrophilic particles on the corrosion of a substrate under the applied coating system. The results of laboratory tests indicate that hydrophilic particles have a strong effect on the corrosion process of the substrate that is protected with water-dilutable coating system.