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Galvanized sheet metal is metal which has been coated in a protective layer of zinc to prevent rusting and to protect the metal from the elements. Galvanization is typically performed on iron or steel, and steel is often galvanized while in sheets. However, there are several types of galvanized ... Galvanized steel is regular steel sheets that have been coated in zinc to make them corrosion resistant. Regular steel is made of iron which will rust when exposed to moisture, either in the form of rain or ambient humidity. Over time rust will corrode a steel part to the point of failure. Hot-dip galvanized steel strip (also sometimes loosely referred to as galvanized iron) is extensively used for applications requiring the strength of steel combined with the resistance to corrosion of zinc, such as roofing and walling, safety barriers, handrails, consumer appliances and automotive body parts.