Weathering of coil-coatings: UV radiation and thermal effects
DOI:
https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1115Keywords:
Organic coatings, Electrochemical impedance, XPS, FTIRAbstract
The effect of heat and of QUV ageing on coil coatings was tested by electrochemical impedance, and the results compared with surface analysis of the polymers by FTIR and XPS. It was shown that UV radiation is more relevant than heat to chemical degradation. A different correlation between water permeation and chemical degradation was observed depending on the coating thickness: for the thinner coatings, the higher UV degradation has corresponded to increased water absorption, whereas in the thicker coating, the bulk effect of heat was more relevant to water permeation.
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