Sensitive methods for studying the environmental performance of protective coatings

George, Graeme A., Colwell, John M., Trueman, Tony, & Will, Geoffrey (2013) Sensitive methods for studying the environmental performance of protective coatings. In Corrosion & Prevention 2013, 10-13 November 2013, Brisbane Convention & Exhibition Centre, Brisbane, QLD.

Abstract

The safe working lifetime of a structure in a corrosive or other harsh environment is frequently not limited by the material itself but rather by the integrity of the coating material. Advanced surface coatings are usually crosslinked organic polymers such as epoxies and polyurethanes which must not shrink, crack or degrade when exposed to environmental extremes. While standard test methods for environmental durability of coatings have been devised, the tests are structured more towards determining the end of life rather than in anticipation of degradation. We have been developing prognostic tools to anticipate coating failure by using a fundamental understanding of their degradation behaviour which, depending on the polymer structure, is mediated through hydrolytic or oxidation processes.

Fourier transform infrared spectroscopy (FTIR) is a widely-used laboratory technique for the analysis of polymer degradation and with the development of portable FTIR spectrometers, new opportunities have arisen to measure polymer degradation non-destructively in the field. For IR reflectance sampling, both diffuse (scattered) and specular (direct) reflections can occur. The complexity in these spectra has provided interesting opportunities to study surface chemical and physical changes during paint curing, service abrasion and weathering, but has often required the use of advanced statistical analysis methods such as chemometrics to discern these changes. Results from our studies using this and related techniques and the technical challenges that have arisen will be presented.

Impact and interest:

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ID Code: 68723
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Coating degradation, Lifetime prediction, FT-IR reflectance, Polyurethane, UV degradation
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Physical Chemistry of Materials (030304)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Australasian Corrosion Association Inc
Copyright Statement: The author(s) retain(s) the right to use the substance of this manuscript in future works, including lectures, press releases and reviews provided that acknowledgement is made to the publisher the Australasian Corrosion Association Inc
Deposited On: 19 Mar 2014 01:41
Last Modified: 13 May 2014 22:26

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