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7 June 2002 Characterization of epoxy coating degradation using NDE imaging techniques
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Polymeric aerospace coating systems are subject to environmental degradation from ultraviolet light, water exposure and thermal cycling. This paper discusses the current progress in a novel study to develop nondestructive evaluation (NDE) methods for monitoring coating degradation during service. In the current study, weathering tests were conducted for varying lengths of time. The examined specimens were single layer epoxies on aluminum alloy (AA2024-T3) substrates. Artificial weathering of the coated samples was conducted using simulated sunlight exposure (Xenon arc lamps), combined with heat and humidity. The coatings were characterized using spectroscopic and NDE techniques after each exposure interval. The NDE included infrared microscopy and scanning acoustic microscopy (SAM). IR absorption spectra as a function of UV radiation exposure were obtained by using attenuated total reflection- infrared spectroscopy (ATR-FTIR). These spectra provide quantitative measures of coating degradation and enabled a correlation with SAM measurements. Thus, potential acoustic parameters could be identified that can be used to track coating degradation. Degradation in the coating as indicated by the IR spectra and NDE data will be correlated with physical changes observed in the coating morphology.
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Jochen Hoffmann, Victoria Kramb, Joel Johnson, and Norbert Meyendorf "Characterization of epoxy coating degradation using NDE imaging techniques", Proc. SPIE 4703, Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems, (7 June 2002);

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