Improved hot-dip galvanized coating for steel

A hot-dip galvanized coating for improved resistance welding of galvanized steel parts or sheets for use in the automative and appliance industries includes particles of a metal phosphide, and preferably ferrophosphorus particles, having a particle size of from 0.1 to 30 mu m, such particles being i...

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Bibliographische Detailangaben
1. Verfasser:	GEORGE T MILLER
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	A hot-dip galvanized coating for improved resistance welding of galvanized steel parts or sheets for use in the automative and appliance industries includes particles of a metal phosphide, and preferably ferrophosphorus particles, having a particle size of from 0.1 to 30 mu m, such particles being included in the galvanized coating while the zinz or zinc alloy is still molten. This causes nucleation of zinc crystals to occur. Since the melting point of the phosphide is substantially higher than that of zinc this permits the formation of a satin finish instead of the normal spangle finish. The phosphide particles may be present in an amount of 0.1-50% by weight of the zinc. The coating may be 0.08-2.8 mu m thick. The coating can also include up to about 40% by weight of the metal phosphide of an additional metal such as nickel, tin, aluminum or lead, which can be incorporated in the coating as discrete particles or deposited onto the surface of the metal phosphide particles.