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Hot dip galvanizing by itself is a long
lasting and cost effective means of protecting steel from corrosion.
When organic coatings such as paint or powder coatings are applied over
hot dip galvanized steel, the resulting combination is known as a
duplex coating. These coatings are used to:
- Add colour for aesthetic, camouflage, or safety purposes
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Increase the economic life of a structure
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Provide additional protection in aggressive environments
Paint
coatings may be applied soon after galvanizing, or later in the lifetime
of the structure when the galvanized coating has weathered, or later
still when further protection is essential to maintain protection. When
paint is to be used to further extend the life of a galvanized
structure, it is often most economic to defer painting until a long
maintenance-free life has been achieved from the galvanized
coating.
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