Abstract
Attenuated Total Reflection Fourier Transform infrared spectroscopy has been used to study the degradation of two automotive coatings, an acrylic melamine and an acrylic urethane clear coat. The influences of light intensity, temperature and air pollutants on the degradation of the coatings were studied. The results indicate that it is important to include the effect of air pollutants when evaluating the service life of acrylic melamine clear coats by accelerated test methods. A coupling of IR measurements with measurements of gloss retention show that there is correlation between loss of cross-linker from the coating and loss of gloss. Early detection by IR-spectroscopy of loss of cross-linker from the coating can be a useful tool for predicting the service life of automotive clear coatings.
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