The general hot-dip galvanizing process consists of applying zinc surface coatings to iron and steel parts and elements, by dipping them in molten zinc baths at a temperature of 450ºC. The purpose of this process is to achieve the protection of metal elements and parts against corrosion caused by moisture and air pollution.
The main phases of the process are as follows:
During the hot-dip galvanization process, three alloy layers are formed in the Fe-Zn inter-metallic phase, apart from a pure zinc outer layer that provides the material with very high corrosion resistance properties.
With this coating, the so-called “galvanic cell” is formed, which protects galvanized parts from any local scratches or damages in areas in which the base steel is exposed. This is a form of local cathodic protection in which zinc acts as a sacrificial anode.