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The present work aimed to evaluate and understand the corrosion resistance of epoxy-Nb2O5 paint subjected to acid atmosphere and high temperatures. For comparison, the epoxy-Nb2O5 paint and an epoxy comercial paint were partially immersed for a period of 720 and 1440 hours in 40% (v/v) H2SO4 solucion at temperatures of 25°C, 60°C and 80°C. After the immersion period, the degradation analysis, the mechanical characterization of the samples were performed. The coatings were characterized by mean of Scanning Electron Microscopy (SEM), the mechanical strength evaluation was done through the Vickers Ultra Micro hardness tests, and Pull-Off standardized procedure. The results showed the epoxy-Nb2O5 epoxy paint was less blistering, cracked, flaked and rusted when compared to the commercial epoxy paint samples. However, it was important to note that the increase in temperature led to degradation of epoxy-Nb2O5 paint. The addition of temperature was probably responsible for two effects observed in the tests: the degradation of epoxy resin over the immersion time and the dissociation of ions from niobium pentoxide.

AVALIAÇÃO DO COMPORTAMENTO ANTICORROSIVO DA TINTA EPÓXI- Nb2O5 EM ELEVADAS TEMPERATURAS E EM AMBIENTE ÁCIDO