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Galvanized steel, used in construction and infrastructure, consists of steel (mostly iron) coated with an outer...

Galvanized steel, used in construction and infrastructure, consists of steel (mostly iron) coated with an outer layer of zinc metal. How does galvanizing steel protect the steel from corrosion?

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The corrosion of iron or zinc is a chemical reaction with oxygen. Because zinc is more reactive (with oxygen) all of it must be used up before steel is attacked (like ants eating all the frosting off a cake before bothering with the cake). A battery cell can include plates of different metals suspended in a (wet) eloctrolyte and that can generated a current (of electrons) in an external circuit connecting the plates. Usually only one of the plates is eaten up in the process (the zinc in a galvanized steel plate).

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