Influence of Ultraviolet Radiation on Erosive Resistance of Modified Epoxy Coatings

Abstract

The paper presents examination results of erosive resistance of epoxy coatings as well as epoxy coatings with interlayer modified by glass microspheres after ageing under the influence of ultraviolet radiation. Glass microspheres used as filler are spherical particles of aluminosilicate, filled with carbon dioxide and nitrogen, of a diameter not exceeding 0.03 mm and their mass share in the interlayer is 10 %.

Influence of Ageing with UV Radiation on Physicochemical Properties of Acrylic-Polyurethane Coatings

“…Polymer coatings became than brittle and therefore susceptible to physical destruction (cracking) which conduces to fragments of polymer material chipping from the coating surface layer. The process of chipping leads to an increase of coating surface roughness parameters (Ra, Rz, Rt) [3] [4], which in consequence decreases gloss of the coating surface. Photodestruction redounds also to colour fading and local discolouration declining the coating decorativeness.…”

“…The reason of aged coating discoloration was colour change of blue pigment contained in the interlayer which was proved by yellowing of pigments in polyurethane coating (Figure 6), as it was stated during microscopic observation.Coating systems UV ageing caused also increase of their surface layer pencil hardness from H value before ageing to 6H value after ageing for 2016 h. Hardness increase induced brittleness of acrylic top coat increase what brought about its surface roughness increase. Moreover, an increased susceptibility of the coatings to brittle cracking accompanied their hardness increase[2] [4].…”

Resistance to Erosive Wear of Epoxy-Polyurethane Coating Modified With Nanofillers

“…impact their surface. Therefore, erosion is the dominating wear process of polymer protective coatings of agricultural, constructional and mining machines and occurs as a result of erosive particles impacts typical for a given environment (Kotnarowska, 1999a(Kotnarowska, , 2006).…”

“…An intensive chemical and physical destruction of superficial layers occurs as the result of aggressive media adsorption on coating surface and due to the action of ultraviolet radiation,. Ultraviolet radiation is the dominating factor that causes destruction of polymer coatings used in natural climatic conditions (Kotnarowska, 2006). This contributes to the decrease of resistance to erosive wear of epoxy coatings, first of all due to a significant increase of binding resin brittleness and also to an increase of the coating surface roughness.…”

Assessment of the Erosive Wear Kinetics of Epoxy Coatings Modified with Nanofillers

“…impact the surface of the object. Hard particles cause wear of the surface which leads to material losses in the superficial layer [2,3,4]. Erosive wear of polymer coatings manifests itself in abrasion, peeling, scratching, losses of their parts as well as deformation of the coating with substrate-in the places where erosive particles impact the coating.…”