Acoustic and thermographic evaluation of polymeric corrosion protective coatings on aluminum alloy airframe structures

Jochen Hoffmann; Angela Mahan; Mohammad Khobaib; Shamachary Sathish; Norbert Meyendorf

doi:10.1117/12.435553

3 August 2001 Acoustic and thermographic evaluation of polymeric corrosion protective coatings on aluminum alloy airframe structures

Jochen Hoffmann, Angela Mahan, Mohammad Khobaib, Shamachary Sathish, Norbert Meyendorf

Author Affiliations +

Proceedings Volume 4336, Nondestructive Evaluation of Materials and Composites V; (2001) https://doi.org/10.1117/12.435553
Event: 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics, 2001, Newport Beach, CA, United States

Abstract

The goal of this work is to develop a multi-sensor nondestructive evaluation (NDE) approach to characterize aluminum alloy airframe structures under polymeric corrosion protective coatings. Two main efforts are highly relevant: (1) studying different degradation processes in the polymers to estimate the coating performance in service; and (2) detecting and quantifying early stages of corrosion beneath an intact coating. To address these tasks we employed acoustic and thermographic NDE techniques, especially Scanning Acoustic Microscopy and Fan Thermography. SAM can be utilized to map either coating or interface properties (C-scans). The method revealed potential to determine the curing quality of the coatings. It was also possible to detect small corrosion pits under delaminated areas. Furthermore, we evaluated the reflections of surface waves, which are generated and detected by the same probe. This provided an additional tool to examine the substrate/coating interface. Thermography was applied to detect corrosion under the coatings and sites of delamination. Fan Thermography (hot air heating) made it possible, to observe sites of decreasing adhesion over longer time periods. Both acoustic and thermographic results were correlated to electrochemical mapping of corrosion activity which was obtained by Scanning Vibration Electrode Technique (SVET).

Citation Download Citation

Jochen Hoffmann, Angela Mahan, Mohammad Khobaib, Shamachary Sathish, and Norbert Meyendorf "Acoustic and thermographic evaluation of polymeric corrosion protective coatings on aluminum alloy airframe structures", Proc. SPIE 4336, Nondestructive Evaluation of Materials and Composites V, (3 August 2001); https://doi.org/10.1117/12.435553

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