Cold Rolled Zinc Coated Hot Dipped Galvanized Steel Coil GI DC53D+AZ DC51D

Galvanized coil is a metal material with a zinc layer adhered to the surface of thin steel plate through the continuous galvanizing process. Its main materials are steel and zinc alloy, and it is divided into two types: ordinary galvanized steel plate and alloyed galvanized steel plate.

The production process includes immersing the rolled steel plate in a molten zinc bath. For alloying treatment, it needs to be heated to 500℃ after being taken out of the bath to form a zinc-iron alloy layer, which has advantages in coating adhesion and weldability.

The galvanized coating can be treated with passivation to reduce the occurrence of white rust under humid storage and transportation conditions. However, the anti-corrosion performance of this chemical treatment is limited and it hinders the adhesion of most coatings. This treatment is generally not applied to zinc-iron alloy coatings, except for smooth surfaces. As a rule, manufacturers apply passivation treatment to other types of galvanized coatings.