Why is zinc used for galvanizing iron but not copper?
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Galvanization is the process of applying a protective zinc coating to steel or iron in order to prevent premature rust and corrosion. ... Rust is an iron oxide (typically a red oxide) which is formed by the reduction and oxidation reaction of iron and oxygen, in the presence of water or air moisture.
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Zinc is more reactive than iron,it is used to protect it from corrosion because when oxygen in the air reacts with the surface of zinc,a very dense and impermeable coating of zinc oxide is formed and it is this physical barrier that protects the zinc surface from further attack.
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