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On the role of water, temperature, and glass transition in the corrosion protection behavior of epoxy coatings for underground pipelines

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Abstract

Water transport kinetics in the coatings were markedly enhanced and the coating impedances decreased exponentially as temperature increased. The effect of temperature on the coating impedance was attributed to the change in the defect area fraction caused by the thermal expansion of the polymers. The temperature dependence of coating impedance was reversible in a non-aqueous environment but was irreversible in an aqueous environment. This is attributed to the plasticization effect of water on the polymer chains. The effect of glass transition on coating impedances during a short period of exposure to heat source was insignificant.

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Acknowledgments

The authors would like to thank Specialty Polymer Coatings Inc. and Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial and technical support of this project. The discussion with Dr. Farzad Mohammadi in the Corrosion Group at UBC is highly acknowledged. The authors are also grateful for the help in DSC and FTIR experiments from Dr. Christophe Mobuchon and Mr. Arjun Sethi at the Composite Research Network (CRN) at UBC.

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  1. Corrosion Group, Department of Materials Engineering, The University of British Columbia, Vancouver, BC, V6T1Z4, Canada

    Hung M. Ha & Akram Alfantazi

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  1. Hung M. Ha
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Correspondence to Hung M. Ha.

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Ha, H.M., Alfantazi, A. On the role of water, temperature, and glass transition in the corrosion protection behavior of epoxy coatings for underground pipelines. J Coat Technol Res 12, 1095–1110 (2015). https://doi.org/10.1007/s11998-015-9705-0

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