Galvanized coating refers to which type of coating on steel?

Galvanized coating refers to which type of coating on steel?

• A. Aluminized coating
• B. Zinc coating
• C. Chromium coating
• D. Tin coating

Answer: (B)

Galvanized coating means applying a zinc layer to steel to prevent rust. Zinc protects by acting sacrificially: it corrodes before the iron, so the steel stays safe underneath, and if the coating is damaged, the surrounding zinc still shields the steel by providing local galvanic protection and forming a protective patina. In roofing, galvanized steel is common for fasteners and flashing because of its durability and corrosion resistance. Other coatings—aluminum for aluminized, chromium plating, or tin coating—serve different purposes and aren’t what is meant by galvanizing. So the zinc coating is the galvanized coating.

Galvanized coating means applying a zinc layer to steel to prevent rust. Zinc protects by acting sacrificially: it corrodes before the iron, so the steel stays safe underneath, and if the coating is damaged, the surrounding zinc still shields the steel by providing local galvanic protection and forming a protective patina. In roofing, galvanized steel is common for fasteners and flashing because of its durability and corrosion resistance. Other coatings—aluminum for aluminized, chromium plating, or tin coating—serve different purposes and aren’t what is meant by galvanizing. So the zinc coating is the galvanized coating.