This article summarizes the Sendzimir process, the Cook-Norteman process, the coating types, composition, characteristics, and typical applications of various metallic coatings, such as zinc, aluminum, zinc-aluminum alloy, and aluminum-zinc alloy coatings. It provides a discussion on aqueous corrosion and atmospheric corrosion of galvanized steel and aluminized steel, as well as the intergranular corrosion of galvanized steel.