What type of coating is on ZInc plated nails that prevents them from corrosion/rusting?

It's zinc. Zinc is the coating over iron. The nail is iron which is strong enough to deal with the pounding it takes. But iron will rust. Therefore the iron nail is coated in zinc. The zinc acts as a ';sacrificial anode';. The zinc is more reactive than the iron and so the zinc is oxidized in place of iron.

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