WEAR AND CORROSION RESISTANT ROLL IN MOLTEN ZINC BATH

PURPOSE:To improve the wear and corrosion resistances of a roll in a molten Zn bath by forming a coating layer of a self-fluxing alloy on the surface of the roll and cutting grooves in the coating layer in the peripheral direction of the roll. CONSTITUTION:A thermally sprayed layer of a self-fluxing...

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Bibliographische Detailangaben
Hauptverfasser:	UCHIYAMA TERUYUKI, MIZUNUMA MICHIYOSHI
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 improve the wear and corrosion resistances of a roll in a molten Zn bath by forming a coating layer of a self-fluxing alloy on the surface of the roll and cutting grooves in the coating layer in the peripheral direction of the roll. CONSTITUTION:A thermally sprayed layer of a self-fluxing alloy is formed on the surface of a roll in a molten Zn bath in a hot dip galvanizing line, and narrow grooves are cut in the thermally sprayed layer in the peripheral direction of the roll. The self-fluxing alloy has wear resistance at high temp. and is not corroded by molten Zn. The thickness of the thermally sprayed layer is made about 1.5-6 times as large as the depth of the grooves. The layer exfoliates hardly and grooves can be cut again when the surface of the layer is worn.