Published : 2021-11-24

Acrylic polyurethane coatings durability under outdoor weathering in an industrial area

Abstract

: In this work, weathering performance and durability of a commercial automotive acrylic polyurethane topcoat samples exposed at a natural testing station in an industrial atmosphere (Police, Poland) were studied. After a 16-month outdoor aging process, surface morphology and general appearance of the clearcoat were investigated by means of optical and scanning electron microscopes, an optical profilometer and by a glossmeter. For further investigation of the samples surfaces chemistry X-ray photo-electron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) were utilized.
Test results showed that the outdoor exposure changed the appearance of the acrylic polyurethane topcoat surface because protuberant spots of various sizes were observed. Quantitative profilometric analysis indicated an apparent increase of surfaces roughness, however, no signs of chemical degradation of the studied topcoat were revealed by XPS and FTIR analyses. Finally, it was apparent that the surface
protuberances observed after the ageing test resulted by atmospheric deposits consisting mainly of oxygen, calcium, phosphorus, iron, and silicon compounds and elemental carbon. Additionally, it was revealed that a detailed cleaning process of the clearcoat surfaces may remove the detected contaminants.



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Białomazur, M., Jasinska, I. ., Kowalczyk, K., Musik, M., Pasierbiewicz, K., & Wrobel, R. (2021). Acrylic polyurethane coatings durability under outdoor weathering in an industrial area. Polimery, 66(10), 503-517. https://doi.org/10.14314/polimery.2021.10.1