Aluminized zinc coil is a metallic material with a layer of aluminum-zinc alloy coated on the surface of cold-rolled steel sheet through a hot-dip galvanizing process. It combines the corrosion resistance of aluminum with the sacrificial protection of zinc, and is widely used in construction, industrial equipment, and household appliances.
Main Features and Structure
- Coating Composition: Typically composed of 55% aluminum, 43.4% zinc, and 1.6% silicon, forming a dense quaternary crystalline structure at high temperatures, enhancing adhesion and protective performance.
- Dual Protection Mechanism: Aluminum forms an insoluble oxide barrier, providing physical protection; Zinc preferentially corrodes at areas of coating damage, achieving electrochemical protection (sacrificial anode).
- Performance Advantages: Compared to traditional galvanized steel sheets, it has superior corrosion resistance, heat resistance, and reflectivity, with a service life of over 20 years.
- Production Process Flow: Substrate cleaning and pretreatment to remove grease and oxides; Hot-dip plating in an aluminum-zinc alloy molten bath at approximately 600℃; Passivation or oiling after cooling to improve stability and processability; Rolling into coils and cutting to size as required.
