Galvanized steel is widely used for its excellent corrosion resistance, which is achieved by coating the steel with a layer of zinc. There are two main types of galvanized steel:
1. Hot-dip Galvanized Steel
Process:
The steel is immersed in a bath of molten zinc at around 450°C (842°F), allowing a thick, metallurgically bonded zinc coating to form on the surface.
Features:
Thicker zinc layer (typically 40–100 µm)
Strong corrosion resistance, especially in outdoor and industrial environments
Matte, spangled surface appearance
Often used in construction, guardrails, structural components, etc.
2. Electro-galvanized Steel (Cold Galvanized)
Process:
A thin layer of zinc is applied to the steel surface through an electroplating process at room temperature.
Features:
Thinner zinc coating (typically 5–20 µm)
Smoother, more uniform, and shinier surface
Better suited for applications where appearance is important
Common in automotive parts, electronics, and appliances
Yes, galvanized steel can be categorized into hot-dip galvanized and electro-galvanized types. The choice between the two depends on the application, required corrosion resistance, surface finish, and cost.
