Corrosion of marine infrastructure is relentless. The continual exposure to moisture in the presence of chlorides can rapidly degrade steel structures. The use of paint as a barrier coating for corrosion control requires near constant maintenance. Conversely, a duplex zinc coating, that is, a metallic zinc coating with a paint top-coat, offers both barrier and sacrificial corrosion protection mechanisms, with much longer lifetimes between maintenance compared to paint only coatings. A paint top-coat over a metallic zinc base layer protects the zinc from initial corrosion. The metallic zinc base layer similarly protects the paint from underfilm corrosion at scratches and holes. In this way, duplex zinc coatings provide more than twice the life of the corrosion protection provided by one coating system alone. The synergy between the zinc and the paint coatings provides protection far superior to either system used independently. Duplex zinc coating systems have decades of proven performance protecting marine structures from corrosion.

Subject
Steel structures, Costs, Zinc rich coatings, Steel surfaces, Galvanized coatings, Steel, Towers, Corrosion protection, Zinc, Maintenance, Barrier coatings, Paints, Thermal spray coatings
Keywords:
Zinc Coatings, Hot-Dip Galvanizing, Thermal Sprayed Zinc, Duplex Coatings
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2021
Association for Materials Protection and Performance (AMPP)
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