Abstract
As a protective coating, zinc can be applied by hot dipping or by continuous, low-cost galvanizing of sheet and strip. Additional protection can be readily achieved by painting. On-site application can be achieved by zinc spraying, or by using zinc rich paint. Zinc-containing paint has proved particularly effective for offshore structures exposed to atmospheric corrosion. Coatings with inorganic vehicles give outstanding abrasion resistance, and such coatings, having over 80% zinc in the dry film, are giving good protection after twenty years. Those based on organic vehicles should have over 90% zinc in the dry film for maximum protection. They require somewhat less meticulous surface preparation, and provide a more flexible coating, but they have lower abrasion resistance.
Where outstanding resistance to seawater attack is required, either galvanized steel or an inorganic zinc rich paint, plus a vinyl or epoxy based topcoat is recommended. Anodizing will also extend the life of galvanized steel for special components.
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Paper presented at the First Annual Offshore Technology Conference, Houston, Texas, May 18–21,1969.
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Cook, A.R. The Role of Zinc in the Corrosion Protection of Offshore Structures. JOM 22, 40–45 (1970). https://doi.org/10.1007/BF03355635
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DOI: https://doi.org/10.1007/BF03355635