The mechanical properties are mainly selected according to application, processing method, and degree of deformation. For example, the roof panels of buildings are usually not load-bearing, and the deformation is not complicated during processing, so TDC51D is usually selected. Materials with good formability, such as TDC52D and TDC53D, should be selected for parts with relatively large deformation. Appropriate structural steel should be selected according to design requirements for components with heavy requirements, such as TS280GD, TS350GD, etc. Commonly used processing methods for Prepainted Aluzinc Steel Coil include shearing, bending, rolling, etc., and they should be selected according to the characteristics of each processing method when ordering. In addition, since the mechanical properties of the substrate are usually used instead of the mechanical properties of the Prepainted Aluzinc Steel Coil in actual production, and the color-coating process may cause changes in the mechanical properties of the substrate, attention should be paid to this. The substrate type (coating type) and coating weight are mainly selected based on factors such as application, environmental corrosion, service life, and durability. Anti-corrosion is one of the main functions of Prepainted Aluzinc Steel Coil, and the type and weight of the coating are the main factors affecting the corrosion resistance of color-coated plates. Since Prepainted Aluzinc Steel Coil for construction is usually directly exposed to the atmospheric environment, substrates such as hot-dip galvanized sheets and hot-dip galvanized sheets with good corrosion resistance and thick coatings are usually selected. In addition, the corrosion resistance of different types of coatings is also different. For example, in the case of the same coating thickness, the corrosion resistance of hot-dip aluminum-zinc coatings is higher than that of hot-dip galvanized coatings. In addition, corrosion resistance generally increases with coating weight, so it can be improved by using a substrate with high corrosion resistance and increasing the coating weight.
Method to improve the corrosion resistance of Prepainted Aluzinc Steel Coil. There are differences in the corrosion resistance of cut edges of steel sheet with different coating types, which should also be noticed. In addition, service life and durability are important factors that cannot be ignored when selecting materials. If long service life and high durability are required, substrates with good corrosion resistance or heavy coating weight should be selected. Since the coating of galvalume materials contains about 55% aluminum (Al), aluminum is an amphoteric metal that can react with acid and alkali. After cement and water are mixed into concrete sand, it is highly alkaline. In such an alkaline environment, aluminum (Al) will undergo a chemical reaction, which will eventually lead to the dissolution of the coating and the loss of anti-corrosion protection. Therefore, it is not suitable for direct contact with wet cement for galvanized light boards, including Prepainted Aluzinc Steel Coil substrates.