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Characterization of interphase adhesion in multi-layer coating systems

: Wanner, Matthias; Krawczyk, Katarzyna; Schäfer, Daniela; Schauer, Thadeus

Preprint urn:nbn:de:0011-n-1439083 (227 KByte PDF)
MD5 Fingerprint: e8df82a8dcc98ba73815cdb2db24608a
Created on: 11.2.2011

Progress in organic coatings 69 (2010), No.3, pp.260-266
ISSN: 0300-9440
ISSN: 0033-0655
Journal Article, Electronic Publication
Fraunhofer IPA ()
multilayer; multilayer coating; Zwischenschichthaftung; organische Beschichtung; Beschichten; Adhäsion

Multi-layer coating systems are the state of the art for painting of metal and plastic surfaces e.g. in the automotive industry. Utilizing such systems consisting of several specialized coating materials, a high adhesion and a good corrosion protection can be reached, along with good barrier properties, chemical and scratch resistance as well as appealing surface appearance. The interphase regions between single layers of such systems represent areas of a potential weakness, where a delamination and a premature coating degradation can start. To test in a short time the protective properties of the coating, a special hydrothermal cyclic loading test procedure was developed, which causes accelerated build-up of internal stress within the coating system. Using an electrochemical impedance spectroscopy with various optimized electrode geometries, it was possible to detect the early stages of coating degradation and to compare different coating systems. Internal stress measurements contributed additionally to a better understanding of the coating degradation.