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News
Galvanized steel, zinc bath thin steel plate immersed in melting, so that the surface adhesion layer zinc coated sheet steel. At present mainly adopts continuous galvanizing production process, namely the coiling plate continuous immersed in melting zinc plating tank made of galvanized steel; alloy galvanized sheet. This plate is also by the hot dip process manufacturing, but in a groove, heating it to a temperature of about 500 immediately, alloy to make the zinc and iron film. This galvanized coil has good coating adhesion and welding.
The zinc coating of galvanized coil
(1) normal spangle coating spagle coating Zinc layer in normal during the solidification process of Zn grains grew up, free forming has obvious flower morphology of zinc coating.
(2) small zinc flower coating minimized spangle coating Zinc coating in the process of solidification, zinc grain was artificially restricted, as far as possible into small zinc flower coating.
(3) no zinc flower coating spangle-free By adjusting the chemical composition of the plating solution obtained, has no visible zinc flower morphology, uniform coating surface.
(4) of Zn Fe alloy coating zinc-iron alloy coating Heat treatment of steel by liquid groove after galvanizing, the alloy layer of the whole generation of zinc and iron coating, the coating appearance is dark gray, no metal luster, easy to fly in severe forming process, suitable for cleaning in addition to general, without further treatment can be directly paint coating.
(5) differential coated differential coating On both sides of the galvanized steel, requires different weight of zinc coating layer.
(6) finishing skin pass Finishing is the following one or several kinds of objective, cold rolling a tiny deformation of the galvanized steel sheet. The improvement of the galvanized steel surface appearance or suitable for decorative coatings; make the product not see slip line problem (Lv Desi line) or creases temporary minimized etc.