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Friday, 20 September 2019
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Raw materials & technologies, Applications, Automotive coatings

Photodegradation of multilayer automotive coatings tracked in detail

Friday, 21 December 2012

In multilayer automotive coating systems, it is often the e-coat layer which degrades under weathering, leading to coating failure and corrosion. A complex situation - when you look closely to the effects.

Standard automotive multilayer coating system have an overall thickness of 105-115 µm

Source: Fotolia/Andres Rodriguez

Standard automotive multilayer coating system have an overall thickness of 105-115 µm

Source: Fotolia/Andres Rodriguez

In automotive coating systems, the properties of these multilayer systems depend not only on the physical and chemical properties of the individual layers, but also on their interfacial interactions.Dr Marc Entenmann
, Fraunhofer Institute for Manufacturing Engineering and Automation IPA
T, considered with his colleagues the effects of outdoor weathering on the different single layers and on the multilayer system itself.

The photodegradation of polymers are under influence of water and UV light

Current automotive multilayer systems consist of an e-coat (usually a cataphoretic coating), followed by a primer-surfacer, a basecoat and a final clearcoat layer on top.

The photodegradation of polymers under the influence of water and UV light is of interest, because this is the main issue to be considered when polymers, independent of their application, are confronted with outdoor exposure.

In the upcoming European Coatings Journal 1/2013 he presents photooxidation index (POI) measurements, which were performed on cross-sections of unexposed and weathered multi-coat systems by measuring the intensities of hydroxyl and amino groups in the valency vibration region. In this way it could be proved that the POI of the e-coat increases due to generation of hydroxyl groups.

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