1.spangle coating
In the normal solidification process of zinc layer, zinc grains grow freely and form a plating layer with obvious zinc flower morphology.
2. minimized spangle coating
During the solidification of the zinc layer, the zinc grains are artificially restricted to form as fine a zinc flower coating as possible.
3.spangle-free
By adjusting the chemical composition of the plating solution, it has no visually visible zinc flower morphology and has a uniform and uniform coating on the surface.
4. zinc-iron alloy coating
Heat treatment of the steel strip after passing through the galvanizing bath to produce an alloy layer of zinc and iron throughout the coating. This coating has a dark gray appearance and no metallic luster. It is easy to powder during the violent forming process and is suitable for general In addition to cleaning, the coating can be painted directly without further treatment.
5. Differential coating
For both sides of the galvanized steel sheet, plating layers with different zinc layer weights are required.
6, skin pass
Finishing is a cold-rolling process with a small amount of deformation performed on galvanized steel sheets for one or more of the following purposes.
Improve the surface appearance of galvanized steel sheet or be suitable for decorative coating; make the finished product slip line (Lüders line) or crease phenomenon temporarily reduced to the minimum during processing.
