Alclad is a metal consisting of

• A. Pure Aluminum Surface Layers on an Aluminum Alloy Core
• B. Aluminum Oxide on Aluminum
• C. Copper-Coated Aluminum
• D. Magnesium-Coated Aluminum

Answer: (A)

Alclad is made by bonding thin layers of pure aluminum to the surfaces of an aluminum alloy core. The pure aluminum surface layers resist corrosion and provide a ductile, pristine finish, while the core aluminum alloy supplies strength and stiffness. This combination gives a material with excellent corrosion resistance without sacrificing the mechanical properties of the alloy core, which is why it’s widely used in applications like aircraft skins. The other ideas aren’t what Alclad refers to: an oxide coating is a natural, non-metallic film, and copper-coated or magnesium-coated aluminum describes different composite coatings that don’t match the clad aluminum concept.