Análise da influência do tempo de exposição solar da superfície não protegida na adesão de tinta protetora em pás eólicas

Abstract

Brazil stands as a prominent figure in clean energy, with wind energy emerging as the second most significant renewable source for generating electrical power within the country. The efficacy and resilience of wind turbine blades in practical applications are not solely reliant on blade design but also on the intricacies of finishing processes during their fabrication. The occurrence of defects and erosion significantly diminishes the operational longevity of these blades, consequently escalating the expenses associated with repairs. One of the pivotal quality parameters ensuring the safe and compliant operation of turbine blades is the duration of exposure to solar radiation preceding the application of a protective coating. This study delved into exploring the impact of UV radiation exposure duration on the adherence of paint to the external surface of the blade. To achieve this objective, samples mimicking the surface characteristics of wind turbine blades were formulated and subjected to varied exposure periods. Subsequent to the preparation and painting of these samples, the pull-off method was utilized to gauge paint adherence on the surface. This method entails securing a metal disk onto the surface, applying perpendicular tension, and measuring the force required to induce paint detachment from the laminate. The findings from the conducted tests revealed satisfactory results, indicating enhanced paint adherence in samples exposed to lesser direct UV radiation. Nevertheless, it is imperative to underscore that establishing a quality criterion regarding the minimum duration the blade can endure under the specified conditions necessitates test replication, encompassing extended exposure periods and accounting for additional process variables.