Impedance-based sensing of the interlayer adhesion loss in organic coating systems |
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| Authors: | A Miszczyk K Darowicki T Schauer |
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| Institution: | (1) Department of Electrochemistry, Corrosion and Materials Science, Gdansk University of Technology, 11/12 Narutowicza St., 80-952 Gdansk, Poland;(2) Research Institute for Pigments and Coatings, Allmandring 37, 70569 Stuttgart, Germany |
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| Abstract: | The detrimental effects of environmental conditions on the protective organic systems on the metals are well known. Variable
parameters like temperature, humidity and UV radiation influence the protective properties of coatings on metals. Adhesion
of coatings to the substrate and the interlayer adhesion between separate coating layers are main parameters describing the
protective properties of coating systems. Traditional methods of evaluation are destructive and do not allow the monitoring
of such influences. By using conductive electrodes between the layers of protective coating system and electrochemical impedance
spectroscopy (EIS) method, it is possible to detect the changes caused by adhesive debonding and accumulation of water at
the interface. Large changes in the impedance values were observed when humidity and temperature conditions were changed.
A new approach to continuous monitoring and quantification of adhesion changes at real conditions using EIS was proposed.
Examples of monitoring data during laboratory temperature cycling and during real outdoor exposure were shown.
Presented at the 4th Baltic Conference on Electrochemistry, Greifswald, March 13–16, 2005 |
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| Keywords: | Corrosion protection Organic coatings Adhesion EIS |
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