What is the term for adding a relatively thick layer to a metal surface to improve corrosion resistance?

• A. Plating
• B. Cladding
• C. Galvanizing
• D. Anodizing

Answer: (B)

Cladding is the process of bonding a relatively thick protective layer to a metal surface to improve corrosion resistance. By attaching a corrosion-resistant material—often stainless steel or another alloy—to a base metal like carbon steel, the exterior gains durable protection while the core retains its strength and cost benefits. This thicker, bonded shell is especially useful in structural applications exposed to harsh environments.

This differs from plating, which is usually a much thinner surface coating applied for modest corrosion protection or wear resistance. Galvanizing provides a zinc coating that offers sacrificial protection but is typically a coating rather than a thick clad layer. Anodizing creates a protective oxide layer, commonly on aluminum, and is generally thin and primarily used for surface hardness and color, not as a thick protective shell.