Galvanized mast arms support uncounted numbers of traffic signals and signage throughout the United States. The proportion of these that have a “duplex” coating system (both galvanizing and organic coatings) is unknown. However, the number is surely significant, and the number of coating system failures is also significant. The Florida Department of Transportation has estimated there are at least 2,400 mast arm coating failures throughout the State, 150 in the Jacksonville, FL area alone. The authors will discuss findings and experiences from investigating the causes for failures of the mast arm duplex systems and remedies available to owners.

Subject
Steel structures, Zinc rich coatings, Steel surfaces, Protective coatings, Galvanized coatings, Corrosion products, Oxide surfaces, Zinc oxide, Color, Steel, Coating defects, Zinc, Paints
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2008
Association for Materials Protection and Performance (AMPP)
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