Galvanized angle steel is divided into hot-dip galvanized angle steel and cold galvanized angle steel. Hot dip galvanized angle steel is also called hot dip galvanized angle steel or hot dip galvanized angle steel. The cold galvanized coating mainly ensures the full contact between zinc powder and steel through electrochemical principle, and generates electrode potential difference for anti-corrosion. Hot dip galvanized angle steel is also called hot dip galvanized angle steel or hot dip galvanized angle steel. It is to immerse the angle steel after derusting in molten zinc melted at about 500 ℃ to attach a zinc layer to the surface of the angle steel, thus achieving the purpose of anti-corrosion. It is suitable for strong corrosive environments such as various strong acids and alkali fogs. The cold galvanizing process is used to protect the metal from corrosion. For this purpose, a coating of zinc filler is used. It is applied to the protected surface by any coating method and dried to form a zinc filler coating with a content of zinc in the dried coating (up to 95%). Suitable for repair work (I. e., during repair work, only where the protected steel surface is damaged, the surface can be recoated as long as it is repaired). The cold galvanizing process is used for corrosion protection of various steel products and structures.