During the hot dip galvanizing process, iron and steel components are heated to the temperature of the galvanizing bath, of about 450°C. While the steel is immersed in the molten zinc, layers of zinc-iron alloy are formed on the surface by a process of diffusion.
When the steel components are withdrawn from the bath these alloy layers are often covered with a coating of pure zinc.
The formation of the zinc-iron alloy coating depends principally on the chemical composition of the steel. All common steels and irons can be hot dip galvanized, but steels with particular silicon contents may produce a very fast reaction between the iron and the zinc.
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