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Galvanization process coats the barbed wire with a zinc layer. Zinc coatings prevent corrosion of the protected metal by forming a physical barrier and by acting as a sacrificial anode if this barrier is damaged. When exposed to oxygen, water, and carbon dioxide in the atmosphere, zinc yields a thin, impermeable, tenacious and quite insoluble dull grey layer of zinc carbonate which adheres extremely well to the underlying zinc, so protecting it from further corrosion, in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers.