Method of manufacturing hot-dipped galvanized steel sheet

Details Method of manufacturing hot-dipped galvanized steel sheet Method of manufacturing hot-dipped galvanized steel sheet

2011-03-29

2011-03-29

Turocy, David (Department: 1715)

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

C427S347000, C427S331000, C427S398100, C427S398300, C427S431000, C427S434200, C427S435000, C427S436000

Reexamination Certificate

active

07914851

ABSTRACT:
A spangle-free, hot-dip galvanized steel sheet, and a method and device for manufacturing the same. The hot-dip galvanized steel sheet is characterized in that a solidified zinc crystal of hot-dip galvanized layer has an average crystalline texture particle diameter of 10 to 88 μm and there is no solidification traces of dendrites upon observing under a microscope at a magnification of 100×. The method comprises dipping a steel sheet in a bath of a zinc-coating solution containing 0.13 to 0.3% by weight of aluminum; air-wiping the steel sheet to remove an excess of the coating solution; spraying water or an aqueous solution on the air-wiped steel sheet, using a steel sheet temperature in the range of a hot-dip galvanization temperature to 419 ° C. as a spray initiation temperature and using a steel sheet temperature in the range of 417 ° C. to 415 ° C. as a spray completion temperature; passing sprayed liquid droplets of water or aqueous solution through a mesh-like high-voltage charged electrode which is electrically charged with a high voltage of −1 to −50 kV; and allowing the electrode-passed liquid droplets to be bound to the surface of the steel sheet and hereby being served as solidification nuclei of molten zinc.

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