An improved accelerated weathering protocol to anticipate Florida exposure behavior of coatings

A new accelerated weathering protocol has been developed which closely replicates the performance of automotive and aerospace coating systems exposed in South Florida. IR spectroscopy was used to verify that the chemical composition changes that occurred during accelerated weathering in devices with...

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Bibliographic Details
Published in:	Journal of Coatings Technology and Research Vol. 10; no. 2; pp. 153 - 173
Main Authors:	Nichols, Mark, Boisseau, John, Pattison, Lynn, Campbell, Don, Quill, Jeff, Zhang, Jacob, Smith, Don, Henderson, Karen, Seebergh, Jill, Berry, Douglas, Misovski, Tony, Peters, Cindy
Format:	Journal Article
Language:	English
Published:	Boston Springer US 2013
Subjects:	Chemistry and Materials Science Corrosion and Coatings Industrial Chemistry/Chemical Engineering Materials Science Polymer Sciences Surfaces and Interfaces Thin Films Tribology Accelerated testing Weathering Durability Automotive coatings Aerospace coatings
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Summary:	A new accelerated weathering protocol has been developed which closely replicates the performance of automotive and aerospace coating systems exposed in South Florida. IR spectroscopy was used to verify that the chemical composition changes that occurred during accelerated weathering in devices with a glass filter that produced a high fidelity reproduction of sunlight’s UV spectrum matched those that occurred during natural weathering. Gravimetric water absorption measurements were used to tune the volume of water absorption during accelerated weathering to match that which occurred during natural weathering in South Florida. The frequency of water exposure was then scaled to the appropriate UV dose. A variety of coating systems were used to verify the correlation between the physical failures observed in the accelerated weathering protocol and natural weathering in South Florida. The new accelerated weathering protocol correctly reproduced gloss loss, delamination, cracking, blistering, and good performance in a variety of diverse coating systems. For automotive basecoat/clearcoat paint systems, the new weathering protocol shows significant acceleration over both Florida and previous accelerated weathering tests. For monocoat aerospace systems, the new weathering protocol showed less acceleration than for automotive coatings, but was still an improvement over previous accelerated tests and was faster than Florida exposure.
ISSN:	1547-0091 1935-3804
DOI:	10.1007/s11998-012-9467-x