Czasopismo | OCHRONA PRZED KOROZJĄ | Rocznik 2013 - zeszyt 9

Impact of operating environment on the protective and decorative properties of epoxy coatings

DANUTA KOTNAROWSKA

nr katalogowy: 79346

Based on the authors' own research, a destruction analysis has been made of epoxy coatings exposed to environmental factors. A description has been provided of the effects of the dominant destructive forces, which lead to the loss of the protective and decorative properties of coatings. These include silver cracks, caused by exposure to UV radiation, as well as cracking and blistering caused by aggressive media. An assessment was also made of the erosion rates of coatings, aged using: UV radiation, brine, acid rain, potassium hydroxide. Keywords: epoxy coating, destruction, cracking, blistering, erosion.1. Introduction Protective and decorative organic coatings applied onto the surface of various technical objects, are subjected to a variety of environmental factors. The most important of these are described in this article and include: aggressive media, solar radiation (especially UV) and erosion. In reality, these factors interact synergistically, accelerating the aging processes taking place in the coatings. This leads to the destruction and erosion of coatings, contributing both to the loss of their protective and decorative properties [1]. A major cause contributing to the loss of decorative properties is ultraviolet radiation, which in the fi rst phase of UV exposure, causes superfi cial silver cracks to appear (e.g. coatings on car bodies). This, among others, leads to the deterioration of gloss and to discoloration (fading) [2-4]. As a result of the adsorption of aggressive substances, intensive chemical destruction takes place on the surface of coatings which mainly involves the oxidation of organic material, increasing thus the fragility and vulnerability of organic coatings to cracking [1, 5-8]. The shape of the cracks, as well as their size, depends on the type and intensity of the operating environmental factors [9]. Absorption of aggressive media into the interior of the coating, on the other hand[...]

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