Zinc coating purpose

Zinc coating purpose

• A. It increases hardness drastically.
• B. It provides a protective coating against corrosion.
• C. It adds color to the object.
• D. It improves electrical conductivity.

Answer: (B)

Zinc coating is used to stop corrosion. It protects steel by two main ways: it acts as a barrier that blocks moisture and oxygen from reaching the metal, and it provides sacrificial protection. If the coating is damaged and the steel is exposed, the zinc around the damaged area preferentially corrodes instead of the steel, so the underlying metal stays protected longer. This combination is why zinc coatings are common on outdoor hardware and structural parts. They aren’t meant to harden the metal, change its color in a useful way, or improve electrical conductivity.

Zinc coating is used to stop corrosion. It protects steel by two main ways: it acts as a barrier that blocks moisture and oxygen from reaching the metal, and it provides sacrificial protection. If the coating is damaged and the steel is exposed, the zinc around the damaged area preferentially corrodes instead of the steel, so the underlying metal stays protected longer. This combination is why zinc coatings are common on outdoor hardware and structural parts. They aren’t meant to harden the metal, change its color in a useful way, or improve electrical conductivity.