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Zinc spraying, or metallizing, is accomplished by feeding zinc in either wire or powder form into a heated gun, where it is melted and sprayed onto the part using combustion gases and/or auxiliary compressed air to provide the necessary velocity.

Heat for melting is provided either by combustion of an oxygen-fuel gas flame or by electric arc. Processes have been developed for feeding molten zinc directly into the spray nozzle, primarily for use in shop rather than field applications.

Metallizing can be applied to materials of nearly any size, although there are some limits to the complexity of the structure due to limited access to recesses, hollows, and cavities by the metal spray. Abrasive cleaning of the steel is required before metallizing. The zinc coating is normally sealed with a thin coating of a low viscosity polyurethane, epoxy-phenolic, epoxy, or vinyl resin.

See Also:
Zinc Coatings Publication

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