Coating Characteristics of Zinc Spraying (Metallizing)
The sprayed zinc coating is rough and slightly porous, with a specific gravity of 6.4, compared to zinc metal at 7.1. Zinc corrosion products tend to fill the pores as the zinc corrodes in the atmosphere. The coating adherence mechanism is mostly mechanical, depending on the kinetic energy of the sprayed particles of zinc. No zinc-iron alloy layers are present.
Metallizing covers welds, seams, ends, and rivets well, can be used to produce coatings in excess of 10 mils (254 µm), and can be applied in the shop or field. Coating consistency is dependent on operator experience and coating variation is always a possibility. Coatings may be thinner on corners or edges and the process is not suitable for coating recesses and cavities.
See Also:
Zinc Coatings Publication
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