Aluminized zinc coil is a composite coated steel material combining the properties of aluminum and zinc, widely used in construction, home appliances, and automobile manufacturing. Its core advantage lies in the aluminum-zinc alloy coating, which simultaneously provides the corrosion resistance of aluminum and the sacrificial anodic protection of zinc, resulting in a more durable protective effect than a single zinc coating. This type of material is usually supplied in coil form, facilitating subsequent processing into sheets or components of different specifications.
Technical Principles and Core Components: The base material of aluminized zinc coil is cold-rolled steel sheet, with an aluminum-zinc alloy layer coated on the surface through a hot-dip galvanizing process. The alloy composition consists of approximately 55% aluminum, 43.5% zinc, and a small amount of silicon. The addition of silicon improves the adhesion between the coating and the steel substrate, reducing the risk of coating peeling. The coating thickness is controlled by the zinc content parameter, commonly ranging from 40-150 grams per square meter. Increasing the thickness significantly improves the corrosion resistance lifespan. The surface treatment uses an oil-free, fingerprint-resistant technology, reducing fingerprint residue and oxidation reactions through a chemical coating, making it suitable for applications requiring direct exposure to air.
Key Performance Parameter Analysis: The density of 7.85 g/cm³ is consistent with ordinary steel, facilitating engineering calculations. A surface quality grade of FB (higher) indicates a smoother coating surface than conventional products, reducing frictional losses during subsequent processing. The material certificate, serving as quality certification, clearly indicates chemical composition, mechanical properties, and other data for user verification. Zinc content is a core parameter determining corrosion resistance; for example, a 40 g/m² coating provides 5-8 years of protection in industrial atmospheric environments, while 150 g/m² can extend this to over 20 years.
Processing and Application Scenarios: This material supports customized processing services such as leveling, slitting, and cutting into smaller sheets to adapt to the size requirements of different production lines. Simplified packaging design reduces transportation costs, while weighing ensures fair transactions. Typical applications include: exterior curtain walls and steel structure roofs in the construction industry; refrigerator casings and air conditioner outdoor units in the home appliance industry; and chassis protection plates in automotive manufacturing. Delivery-to-factory service simplifies logistics, eliminating the need for users to arrange transportation themselves. It should be noted that excessive bending should be avoided during processing to prevent the coating from cracking, and the environment should be kept dry during storage to prevent localized corrosion.
