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Zinc-rich coatings have long been known to provide excellent corrosion resistance in highly corrosive environments, in general,inorganic zincs for new construction and organic zincs for maintenance. A recent trend has been toward zinc-rich coatings with reduced levels of zinc dust. An SSPC committee formed to revise SSPC Paint 29, Zinc Dust Sacrificial Primer, Performance Based, to reference performance only, removing reference to minimum zinc dust level.
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A nanoparticle enriched epoxy primer (NPE-ZRP) and conventional zinc-rich primer (ZRP) were tested to identify the benefits of nanoparticles for coating durability and corrosion mitigation. An intentional defect was introduced to the coating to expose the steel substrate. Samples were exposed to open circuit potential (OCP) and -1100 mVSCE polarization regime for 30 days in 3.5% (w/w) NaCl aqueous solution.
In this work, a marine environment due to the presence of marine bacteria was exposed to three zinc-rich epoxy coated-steel samples with different carbon nanotube additions. The electrochemical activity was monitored by using open circuit potential and electrochemical impedance spectroscopy.
Departments of Transportation currently use the conventional three-coat system as the predominant choice for the corrosion protection of steel bridge structures. Eliminating one step in the coating process could potentially save time and cost associated with lane closures and traffic control costs. This research paper evaluates several two-coat systems based on the zinc-rich primer and polysiloxane top coat technology.