Galvanized coil is a thin steel plate with a layer of zinc adhered to the surface by immersing the thin steel plate in a molten zinc bath. Galvanized coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils, which are mainly used in construction, home appliances, automobiles, containers, transportation and household industries. Especially steel structure construction, automobile manufacturing, steel silo manufacturing and other industries.

Large quantities of thin galvanized coils are used in automotive manufacturing, reefer containers, the construction industry, ventilation and heating installations, and furniture manufacturing. Galvanizing has become an important anti-corrosion method for steel, not only because zinc can form a dense protective layer on the surface of steel, but also because zinc has a cathodic protection effect. When the galvanized layer is damaged, it can still prevent the iron matrix through cathodic protection material corrosion.

Galvanized Coil Coating:

(1) Normal spangle coating

During the normal solidification process of the zinc layer, the zinc grains grow freely and form a coating with an obvious spangle shape.

(2) Minimized spangle coating

During the solidification process of the zinc layer, the zinc grains are artificially restricted to form the smallest possible spangle coating.

(3) Zinc-free coating

The coating obtained by adjusting the chemical composition of the plating solution has no visible spangle morphology and a uniform surface.

(4) Zinc-iron alloy coating

Heat treatment of the steel strip after passing through the galvanizing bath to form an alloy layer of zinc and iron throughout the coating. A coating that can be painted directly without further treatment other than cleaning.