MANUFACTURE OF HOT DIP GALVANIZED STEEL SHEET HAVING HIGH CORROSION RESISTANCE

PURPOSE:To simply and efficiently manufacture a hot dip galvanized steel sheet having high corrosion resistance by blowing Al2O3 or Al powder on the surfaces of a hot dip galvanized steel sheet to form Al2O3 or Al films as surface layers. CONSTITUTION:A steel sheet S is introduced into a zinc pot 1...

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Bibliographische Detailangaben
1. Verfasser:	HAKAMAGI HIROYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To simply and efficiently manufacture a hot dip galvanized steel sheet having high corrosion resistance by blowing Al2O3 or Al powder on the surfaces of a hot dip galvanized steel sheet to form Al2O3 or Al films as surface layers. CONSTITUTION:A steel sheet S is introduced into a zinc pot 1 through a snout 2 with a sink roll 3 and hot dip galvanized. After the amount of molten zinc stuck is regulated through gas blowers 4, Al2O3 and/or Al powder is blown on the surfaces of the hot dip galvanized steel sheet from powder blowing devices 5 each fabricated by placing a nozzle 7 for spouting powder sent from a tank 9 with a blower 8 in a box 6 suspended liftably from a holder 11 through a winding drum 13 and a wire 12. The powder is preferably blown before the stuck molten zinc is solidified. Thus, Al2O3 and/or Al films are formed on the surfaces of the hot dip galvanized steel sheet with the simple equipment and a hot dip galvanized steel sheet having superior corrosion resistance in the naked state is obtd.