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This paper provides an introduction to the hot-dip galvanization process as an effective and important coating option and the necessary surface preparation steps for successful painting over hot-drip galvanized steel, also known as a duplex system. Proper practices and procedures must be used to prepare new and weathered zinc-coated surfaces on after-fabrication steel products for painting to improve the bond of paint to the zinc surface and provide long-term protection against corrosion.
Engineers, architects, DOTs, and other specifiers use hot dip galvanizing to provide corrosion protection to steel and iron in many industries, including transportation and highway, parking garages, bridges, structural, agricultural, petrochemical, and original equipment manufacturing. To ensure continued corrosion protection and structural integrity in these industries, it is necessary to properly inspect the galvanizing.
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Duplex systems, also known as painting over hot dip galvanized steel, are extremely effective corrosion protection systems. However, careful surface preparation techniques need to be used to alleviate potential coating failures. The age and characteristics of the galvanized coating should be used to determine what type of surface preparation is needed.
Duplex systems, also known as painting over hot dip galvanized steel, are extremely effective corrosion protection systems. However, careful surface preparation techniques need to be used to alleviate potential coating failures. The age and characteristics of the galvanized coating should be used to determine what type of surface preparation is needed. Surface preparation should develop an anchor profile for the paint without removing the zinc coating.