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Study of photooxidative degradation in automotive multilayer coatings with photooxidation index

: Hilt, Michael

Vincentz Network GmbH & Co. KG, Hannover; u.a.:
EC European Coatings Congress. Proceedings : Nuremberg, Germany, 18 + 19 March 2013
Hannover: Vincentz, 2013
Session 1, Paper 1.2, 5 S.
European Coatings Congress <2013, Nürnberg>
European Coatings Show <2013, Nürnberg>
Fraunhofer IPA ()
multilayer coatings; Mehrlagenschicht; Photooxidation Index (POI); photodegradation; Elektrotauchlackierung (ETL); Multischicht-Lacksystem; Kraftfahrzeug; Beschichtung; Lack; Oxidation

Photooxidative degradation of e-coats in OEM automotive coating systems was investigated with photooxidation index (POI) measurements on flat cross sections of coatings. By comparing the obtained POI results with the corresponding UV-Vis-NIR transmittance and absorption data of the coating layers, the obtained results proofed, that the transmittance of UV light is not the only important parameter which influences the degradation of the e-coat and especially thermocatalytic effects, which accelerate the photooxidation process, should be considered additionally.