Hot dip galvanizing creates a thick, resilient layer of zinc iron alloys on the surface of a steel product. The hot dip process does not generally reduce the strength of the base metal, with the exception of high-strength steels where hydrogen embrittlement can become an issue.
In the process of hot dip galvanizing the base metal is immersed in a bath of molten zinc at a temperature of around 450 °C (842 °F). The zinc alloys with the surface of the steel, forming a matt grey surface that protects the steel from further corrosion.
Hot dip galvanized steel offers a wide protection range from Z100 to Z600 and a tight bond between the hot dip coating and the steel. That’s why zinc coatings are well suited to forming.
The composition of zinc coating consists almost entirely of zinc (>99%) and is lead free, resulting in finely crystallized zinc spangle that meets high requirements for visual appearance. The corrosion resistance provided by the zinc coating is in direct proportion to the coating's thickness. The Z600 coating (42 µm on both sides) can achieve a service life of up to 80 years.
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