PREPARING METAL FOR MELT COATING

Steel is prepared for hot-dip coating in molten zinc, by forming lead chloride on it in a greater mass (at least 12g/m ) than possible by evaporation from saturated aqueous solution. One way of so forming the lead chloride is to cathodise the steel (24000 coulomb/m ) in 1:1 HCl saturated with lead c...

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Bibliographische Detailangaben
Hauptverfasser:	CHARLES ANTHONY HOTHAM, ROBERT DAVID JONES
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:	Steel is prepared for hot-dip coating in molten zinc, by forming lead chloride on it in a greater mass (at least 12g/m ) than possible by evaporation from saturated aqueous solution. One way of so forming the lead chloride is to cathodise the steel (24000 coulomb/m ) in 1:1 HCl saturated with lead chloride, and air-dry the steel. The steel thus prepared is dipped for 2 minutes in molten zinc or, for greater corrosion resistance, in molten scrap zinc.