How can corrosion be prevented or controlled, and how does galvanization protect steel from rusting?

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Corrosion can be prevented through protective coating, cathodic protection (sacrificial anodes or impressed current), selection of appropriate material, galvanization, and sherardization. Galvanization involves dipping steel into molten zinc, providing both a barrier and sacrificial anode protection. If the coating is damaged, the surrounding zinc corrodes preferentially, protecting the exposed steel.