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Abstract:	Bei im Korrosionsschutz üblichen mit aminischen Härtern vernetzten aromatischen Epoxidharzbeschichtungen können sich infolge Bewitterung Oberflächenschichten mit veränderter chemischer Struktur bilden. Diese können Ursache für unzureichende Haftung nachfolgender Beschichtungen sein. Die Beeinträchtigung der Verbundeigenschaften hängt mit den Bewitterungsparametern zusammen. Prüfverfahren unter Einbeziehung von Freibewitterung weisen deshalb oft eine mangelhafte Reproduzierbarkeit auf. Wichtige Faktoren sind Auslagerungszeitpunkt und Dauer der Bewitterung. Im vorliegenden Beitrag werden Untersuchungen zum Haftverbund zwischen unterschiedlichen Epoxidharzbeschichtungen mit 2K-Polyurethandeckbeschichtungen beschrieben und auf die besondere Problematik dieser Haftverbundprüfung eingegangen. Investigation of the adhesion behaviour between exposed 2K-EP coatings and following 2K-PUR coatings - influence of weathering. During weathering of coatings of aromatic epoxy resins, for corrosion protection usually crosslinked by amine based hardeners, the chemical structure of surface layers might be changed. Therefore the following coating layers can suffer from bad adhesion. The impairment of adhesion between intermediate coat and top coat depends on weathering parameters. So the testing methods, including outdoor exposure, show often insufficient reproducibility. Important parameters are the starting time and duration of weathering. In this paper investigations of the adhesion between several coatings of epoxy resins and top coats, consisting of 2K-polyurethane are described. Here the special topic is the testing of adhesion between intermediate coat and top coat.
Source:	Stahlbau 80 (2011), No. 8
Page/s:	627-635
Language of Publication:	German

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