Corrosion is a durability concern for any unprotected structural steel from its exposure environment and coatings are widely used for corrosion protection. Zinc-rich-primer-based three-coat (ZRP) systems are the most widely used for structural steel, since 1980's. However these coating systems often require regular maintenance. So there is always interest to develop durable novel coating systems to reduce the maintenance cost. The durability and long-term performance of coating systems strongly depend on its bond to the steel substrate and proper surface preparation. Nanoparticles are being considered in the development of durable coating systems due to their beneficial mechanical properties. The purpose of this study was to evaluate the mechanical performance of a nanoparticle enriched zinc rich epoxy coating (NPE-ZRP) when applied with non-ideal steel substrate surface conditions. Different levels of pre-exposure conditions included high humidity, surface moisture and salt contamination with improper surface cleaning. The pull-off strength test was chosen to validate mechanical performance of the coating after exposure. The wetting contact angles for different reference liquids were measured and used for the calculations of the surface free energy, which were subsequently compared to visual and pull-off testing.

Subject
Primers, Zinc rich coatings, Steel surfaces, Salts, Top coats, Metal surfaces, Wetting, Steel substrates, Substrate surfaces, Liquids, Preconditioning, Coating adhesion, Mechanical failure
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2019
Association for Materials Protection and Performance (AMPP)
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