Galvanizing is the practice of immersing clean, oxide-free iron or steel into molten zinc in order to form a zinc coating that is metallurgically bonded to the iron or steel’s surface. The zinc coating protects the surface against corrosion by providing protection to the iron or steel in two ways.
The zinc coating shields the base metal from the atmosphere
Because zinc metal is more electronegative than iron or steel, the zinc gives cathodic or sacrificial protection
1. Surface preparation