GROSSO, M. ; SOUZA, M. P. ; REBELLO, J. M. A. ; MARGARIT-MATTOS, I. C. P. ; Pereira, G.R. ; SOARES, S. D. .
Resumo: Thermography is a non destructive technique that maps the heating distribution on a material’s surface. The advantages of the technique are the velocity and efficiency in superficial and internal defects detection, in addition to the fact that no specific treatment of the surface is needed due to its contact-free nature. The purpose of the present paper is to verify the possibility of using the infrared thermography as a non destructive technique in the inspection of the following organic coating defects: blistering, lack of adherence and undercoating corrosion. For the experimental procedure, thermography has been applied using the active approach; the Pulsed Thermography technique. The sample was submitted to a ten seconds thermal pulse, emitted by halogen lamps. Analyzing the originals thermographic images, all the three kinds of defects were detected. Samples with defects simulating localized corrosion were prepared with holes of six different dimensions. In some samples the holes were filled with iron oxide, simulating corrosion product. The results had shown the method capacity to detect and dimension corrosion flaws on organic coatings, including composite materials widely used in extreme conditions of the oil industry.
