Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.44: Poster

Monday, April 1, 2019, 17:30–19:30, Poster B1

Investigation of swelling of coatings and the change of their mechanical properties at different air humidity — •Hannes Schedlberger¹, Bernhard Strauss², and Sabine Hild¹ — ¹Institute of Polymer Science, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria — ²Voestalpine Stahl GmbH, voestalpine-Straße 3, 4020 Linz, Austria

To protect steel surfaces against corrosion thin layer of organic coatings are applied. When used, water may be absorbed n the coatings and diffused through the layers. This can cause a variety of damages. Although this is a well known effect, the process of migration within the coatings and its consequences are still not clear. Therefore it is of utmost importance to investigate the amount of absorbed water, the adsorption kinetics and the correlation of the water absorption with the chemical structure and the mechanical properties of the coatings.

Atomic Force Microscopy (AFM) provides the possibility to observe the changes at the surface and to analyse the changes in the mechanical properties of the coatings as well. The swelling of the organic coating applied on a steel substrate were observed for 24 hours at various air humidity concentrations within a humidity cell at the AFM. To obtain the various air humidity concentrations, different salt solutions like potassium hydroxide or potassium nitrate were inserted into the humidity cell, followed by the analysis of the coatings. The changes of the mechanical properties of the coatings were analysed performing force distance curves.