Improved methods
to assess the degradation of coil coatings to
approximate lifetime have been an area of academic and industrial
interest for decades. This work aims to elucidate the differences
in the degradation behavior of two coil coating systems: one standard
commercial formulation and one formulation with a significant addition
of biorenewable reactive diluents. Depth-resolved degradation behavior
of samples exposed to accelerated and natural field weathering is
assessed. Focal plane array attenuated total reflection-Fourier transform
infrared spectroscopy was used to acquire high-resolution chemical
data from a sloping cross section. The results agreed with conventional
photoacoustic spectroscopy. Degradation profiles for the two coatings
were significantly different, with the biobased samples showing a
more durable behavior. This study provides a method for detailed assessment
of coating degradation, giving a good estimation of its durability.
This is both a way to compare the performance of coating systems and
to improve the understanding of the impact of exposure conditions,
paving the way for the development of more sustainable coil coatings.
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