Materials - Galvanized Steel
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Steel that has a zinc protective coating for resistance against corrosion. The level of protection provided is measured by the weight of the galvanized coating (ie G30, G60, G90) applied to the surface area of the steel.
Exhibits greater corrosion resistance than other metals.
Galvanized steel used in the construction industry is manufactured by a hot dip process in accordance with BS 729.
The process deposits a minimum weight of zinc of 610 gms/m2 equal to 85 microns thickness on each face. The thickness of zinc may be increased to 140 microns or more by the use of special steels or by blast cleaning the steel prior to galvanizing.
For many service conditions galvanized steel provides adequate corrosion protection without further treatment using surface coatings. However, there are instances in which the exposure conditions require application of a coating system to protect the galvanizing and give increased durability, or for cosmetic appearance.