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Testing of the UV light effect on the automotive paints by FTIR spectroscopy

Identification of paint traces by FTIR spectroscopy is a recognized forensic method. It is especially important in a hit and run car accidents. The objective was to discover how automotive paints exposed to UV light are affected. Methods we used were FTIR spectroscopy and polarised microscopy. Our primary results were IR spectra of 13 samples. We used samples from a few manufacturers in yellow, red, blue and green colour. Spray paints were applied on stainless steel and left under UVB (UV light with a wavelength of 304 nm) and UVC (UV light with a wavelength of 254 nm) for 30 days. We obtained IR spectra of samples after 15 and 30 days. We concluded that samples visibly changed after the experiment. We saw some interesting modifications of IR spectra, which could give us an information of what is happening in car paint sample when exposed to UV light.

automotive paints ; IR spectroscopy ; UVC ; UVB

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