Galvanizing, or galvanization, is a manufacturing process where a coating of zinc is applied to metal products like steel or iron to offer protection and prevent rusting on the element.
Hot-dip galvanizing is the process of immersing iron or steel in a bath of molten zinc to produce a corrosion resistant, multi-layered coating of zinc-iron alloy and zinc metal. While the steel is immersed in the zinc, a metallurgical reaction occurs between the iron in the steel and the molten zinc.
How does galvanizing work?
The positively charged zinc ions at the zinc (anode) surface react with negatively charged hydroxyl ions from the electrolyte and zinc is slowly consumed, providing sacrificial protection for the steel. This phenomenon that prevents corrosion of the steel, i.e. the cathode, is known as cathodic protection.
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