Method for applying a protective coating to a flat steel product and flat steel product having a corresponding protective coating

The invention relates to a method for applying a protective coating (10) to a flat steel product (100), wherein the protective coating (10) is produced by guiding the flat steel product (100) having a strip entry temperature of 400-490 degrees Celsius through a molten zinc alloy bath. The molten zin...

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Bibliographische Detailangaben
Hauptverfasser:	Hofer, Klaus, Riener, Christian K, Fischer, Wilhelm, Angeli, Gerhard
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS 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 FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY PERFORMING OPERATIONS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The invention relates to a method for applying a protective coating (10) to a flat steel product (100), wherein the protective coating (10) is produced by guiding the flat steel product (100) having a strip entry temperature of 400-490 degrees Celsius through a molten zinc alloy bath. The molten zinc alloy bath (11) has a bath temperature of 400-480 degrees Celsius and contains an aluminum fraction and a magnesium fraction. In particular, the molten zinc alloy bath (11) has the following composition: the aluminum fraction is in the range between 1.8 and 3.0 weight percent; the magnesium fraction is in the range between 1.3 and 2.7 weight percent; the aluminum fraction in weight percent is greater than the magnesium fraction in weight percent; the ratio of the magnesium fraction in weight percent to the sum of the aluminum fraction in weight percent and the magnesium fraction in weight percent is in the range between 0.31 and 0.44; and the remainder of the molten zinc alloy bath is zinc and unavoidable impurities.