What is the difference between galvanized sheet metal and zinc-magnesium coated sheet metal?

Galvanized sheet and zinc-magnesium coated sheet differ in several important features:

Coating composition

• Galvanized sheet: It is covered with a layer of pure zinc.
• Zinc-Magnesium Sheet: The coating consists of zinc with magnesium added, which provides better protective properties.

Corrosion resistance

• Galvanized sheet metal: Provides good protection against corrosion, but is susceptible to coating damage during transportation and installation.
• Zinc-magnesium sheet: It has much better corrosion resistance than galvanized sheet.

Durability

• Galvanized sheet: It has a shorter service life compared to zinc-magnesium sheet.
• Zinc-magnesium sheet: It is characterized by longer life and better protection of the steel substrate.

Thickness and weight of the coating

• Galvanized sheet metal: Requires a thicker coating for adequate protection.
• Zinc-Magnesium Sheet: Achieves comparable or better protective properties with less coating thickness and weight.

Resistance to weathering Zinc-magnesium sheet shows better resistance to salt spray, moisture and sulfur dioxide compared to galvanized sheet.