Six epoxy-based coating systems were tested for their resistance to degradation in the form of “cold-wall” blistering. The coatings were applied to type 1010 steel (UNS G10100) substrates and exposed to heated water for up to 10 months in Atlas test cells as a modified version of NACE Standard TM0174. The performance of the coatings was measured by the exposure time for the coatings to start blistering, the time for the corrosion potential (Ecorr) of the coating substrates to shift toward active values, and the delamination (or blistering) rate of the coatings. Good cold-wall blistering resistance was observed for two polyamine-cured epoxy coating systems with porosity levels < 1 vol%. These two coating systems exhibited longer lifetimes than the other coating systems under four different test conditions that varied coating thicknesses and exposure temperatures. Intermediate performance was observed for a polyamine-cured epoxy with an average porosity level > 1 vol%. Poor cold-wall blistering resistance was shown by a polyamide epoxy system, an amine adduct epoxy system, and an amido-amine epoxy system, all of which had porosity levels > 1 vol%. Most of the coating samples exhibited linear blistering rates, which indicated that the kinetics of cold-wall blistering were diffusion controlled. The two coating systems that showed the best resistance to cold-wall blistering also showed the lowest blistering rates, indicating that these coatings may have had lower permeabilities and/or better adherences than the poorer performing coatings, probably as a result of their lower porosity levels and similar compositions.
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1 November 1995
Research Article|
November 01 1995
Effect of Porosity on Resistance of Epoxy Coatings to Cold-Wall Blistering Available to Purchase
A.R. Marder
A.R. Marder
*Energy Research Center, Department of Materials Science and Engineering, Lehigh University, 5 East Parker Ave., Bethlehem, PA, 18015-3195.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1995
CORROSION (1995) 51 (11): 861–871.
Citation
J.R. Kosek, J.N. DuPont, A.R. Marder; Effect of Porosity on Resistance of Epoxy Coatings to Cold-Wall Blistering. CORROSION 1 November 1995; 51 (11): 861–871. https://doi.org/10.5006/1.3293563
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