Galvalume / AlZnSi Alloy
Zinc plating is a widely used metallic coating for corrosion protection of steel, providing a very good combination of galvanic and barrier protection. However, in order to achieve a longer product life, an alloy known commercially as Galvalume alloy (AlZnSi alloy) has been developed, which is used for coating steel, just like Zinc.
This steel coating product offers a better physical barrier than standard galvanized coatings and offers better corrosion resistance in most environments, including temperatures up to 750 degrees F.
Galvalume Zinc Galvanizing Alloys
• Far superior to galvanized, almost equal to the properties of aluminum-clad steel. No discoloration or oxidation for durable use at 315°C
• Three to six times better corrosion resistance than zinc plated (Galvanized) steel with the same coating thickness
• Unlike galvanized steel, which requires ventilation or pre-treatment, it can be painted without pre-treatment or ventilation when used for signage or general purposes, thanks to its superior adhesion between the coated layer and the paint
Galvalume Chemical Analysis
| Analysis ( %) | Galvalume / AlZnSi |
|---|---|
| Al | 55 – 58 |
| Zn | 41 – 43 |
| Si | 1.5 – 2 |
| Fe | ≤0.25 |
| Cu | ≤0.03 |
| Cd | ≤0.05 |
| Pb | ≤0.01 |
| Sn | ≤0.05 |
| Ni | ≤0.05 |