1.What is the difference in material density between galvanized coil and color-coated aluminum coil?
Galvanized Coil: The base material is steel, with a density of approximately 7.85 g/cm³.
Colored Aluminum Coil: The base material is aluminum, with a density of approximately 2.7 g/cm³.
2.What is the difference in strength and stiffness between galvanized coil and color-coated aluminum coil?
Galvanized Coil (Steel): High strength, good rigidity, strong load-bearing capacity, and resistant to bending and deformation.
Colored Aluminum Coil (Aluminum): Lower strength and less rigidity. In situations where heavy loads need to be supported or deformation must be prevented, increased thickness or reinforcement ribs are often required.
3.What is the difference in corrosion resistance between galvanized coil and color-coated aluminum coil?
Galvanized coil: The zinc layer, a sacrificial anodic layer, protects the steel substrate, offering excellent corrosion resistance. However, if the zinc layer is damaged, the steel inside will rust.
Colored aluminum coil: Aluminum naturally forms a dense aluminum oxide protective film, providing excellent resistance to atmospheric corrosion, making it particularly suitable for coastal areas or high-humidity regions. The color coating provides additional protection and aesthetic appeal.
4.What are the differences in the application scenarios of galvanized coils and color-coated aluminum coils?
Galvanized aluminum coil: Commonly used for structural components requiring high strength, cost, and durability, such as warehouse roofs, factory walls, ventilation ducts, and appliance casings.
Colored aluminum coil: Widely used in applications requiring high weight and aesthetics, such as building roofs and walls (especially long-span structures), interior decoration, and appliance panels (such as high-end ovens and microwave oven interiors).
5.What is the weight difference between galvanized coil and color aluminum coil?
Weight ratio: 1.35 / 3.925 ≈ 0.34
This means that, with the same specifications, the weight of a pre-coated aluminum coil is only about 34% of that of a galvanized coil, or approximately 66% lighter.