Galvanized Steel Plating Definition

Plating Definition

(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)Spangle-free

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

The steel strip after passing through the galvanizing bath is heat treated to form an alloy layer of zinc and iron in the whole coating. The appearance of this coating is dark gray without metallic luster. A coating that can be painted directly without further treatment other than cleaning.

(5)Differential coating

For both sides of galvanized steel sheet, coatings with different zinc layer weights are required.

(6) Skin pass

Skin-passing is a cold-rolling process performed on galvanized steel sheets with a small amount of deformation 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 not see the phenomenon of slip line (Lydes line) or crease produced during processing to a minimum temporarily.