What is galvanizing, and when is hot-dip galvanizing typically applied?

• A. Coats steel with zinc for decorative purposes; applied during fabrication for all components
• B. Coats steel with zinc for corrosion protection; hot-dip galvanizing is typically applied after fabrication to all steel members and components
• C. Applies a ceramic coating after welding
• D. Used only on interior steel

Answer: (B)

Galvanizing is coating steel with zinc to protect it from corrosion. In the hot-dip process, the steel is dipped into molten zinc, which creates a durable zinc coating (and a zinc–iron alloy layer) that provides sacrificial corrosion protection, meaning zinc will corrode before the steel does.

This coating is typically applied after fabrication to all steel members and components. Coating after they’re shaped and assembled ensures every surface, including edges, joints, and welds, gets protected. It also avoids damaging a coating during welding or other fabrication steps and makes it easier to protect the complete final assembly. It’s not about decoration, not a ceramic coating, and not limited to interior use.