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Powder coating over hot dip galvanized steel is an extremely effective corrosion protection system. 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.
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There are very few markets that have not been affected by powder coatings. Powders are used widely throughout the automotive industry for underhood parts, wheels, trim, and as full body primers. Whereas it is unlikely that powder coatings will ever replace liquid color coats in automotive assembly plants, some companies have has made full body powder clear coats a reality.
This paper will cover understanding the hot-dip galvanizing process and coating benefits, Identify the benefits of utilizing paint/powder coating with hot-dip galvanizing in a duplex system, Recognize the importance of communication and clear assignments of responsibility in the specification of successful duplex systems and differentiate between HDG surface conditions in order to properly prepare the zinc coating for paint/powder.