Adhesion Evaluation of Duplex Paint System for Sustainable Infrastructure
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 9
Abstract
Organic paints are applied to galvanized or metalized steel surfaces in a duplex system, which is potentially more sustainable than the zinc-rich primer/steel system. A series of experimental tests were performed to measure and investigate adhesion strengths on three different types of roughened zinc surfaces. The contact angles were also measured for freshly formulated liquid paints on the roughened zinc surfaces to test if there is a correlation between the paint wetting property and the adhesive strengths. By comparing duplex system and zinc-rich primer/steel qualified North East Protective Coating (NEPCOAT) panels, it was found that the paint adhesion of the duplex system is as strong as the zinc primer/steel panels test results. The results also showed that adhesive strengths depend on the match between the paint and type of roughened zinc surfaces. The measurement of liquid paint wetting properties indicates small contact angles correlate with stronger pull-off adhesive strength. The authors of this study suggest that contact angle/strength correlation could be useful as a tool for optimizing the match between the paints and the profiled zinc surface.
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Acknowledgments
This research project was sponsored by NETC under project 05-5 administered by FHWA CT Division Office. Details of the experimental data and the full report are available from NETC (http://www.uvm.edu/trc/netc/). The authors thank the NETC05-5 technical committee members for their guidance throughout the research project: Jerry McMahan, Vermont Agency of Transportation, Chairperson; Jerry Zoller, New Hampshire DOT; Denis Dubois, Maine DOT; Andrew J. Mroczkowski, Connecticut DOT; Willie Feliciano, New York DOT; Mary Grieco, Massachusetts Highway Department; and Colin Franco, Rhode Island DOT. The authors thank the following persons for their generous help: Michael Hewins, Massachusetts Highway Department; Michael Sock, Rhode Island DOT; and Richard Brown, Department of Chemical Engineering, URI. The authors also thank the anonymous reviewers who suggested useful clarifications including the threshold model discussed in the main text.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 7, 2016
Accepted: Dec 6, 2016
Published online: May 18, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 18, 2017
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