PROCESS FOR TREATING ZINCIFEROUS SURFACES

A solid 10-200 mg/m , calculated as chromium metal, film is formed on a zinciferous surface by coating the surface with an acidic aqueous liquid composition that contains hexavalent chromium ions, trivalent chromium ions, at least one of sulfate ions and nitrate ions, and zinc, nickel, cobalt, and/o...

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Bibliographische Detailangaben
Hauptverfasser:	MIZUNO, KENSUKE, OGINO, TAKAO, KAWAGUCHI, JYUN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR ARTIFICIAL STONE CEMENTS CERAMICS 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 COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIME, MAGNESIA METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS REFRACTORIES SLAG SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	A solid 10-200 mg/m , calculated as chromium metal, film is formed on a zinciferous surface by coating the surface with an acidic aqueous liquid composition that contains hexavalent chromium ions, trivalent chromium ions, at least one of sulfate ions and nitrate ions, and zinc, nickel, cobalt, and/or aluminum ions, in which liquid composition the trivalent chromium ion/hexavalent chromium ion molar ratio is 1/9 to 4/1, the (nitrate + sulfate + phosphate)/(hexavalent chromium ion + trivalent chromium ion) molar ratio is 0.1 to 2.0 and the metal ion/inorganic acid molar ratio is 0.05 to 1, and subsequently drying the applied coating. The chromate film formed has both an excellent resistance to blackening and an excellent resistance to white rust. Un film solide de 10-200 mg/m , exprimés en chrome métal, est formé sur une surface zincifère par enduction de celle-ci avec une composition liquide aqueuse acide contenant des ions chrome hexavalents, des ions chrome trivalents, au moins des ions sulfate ou des ions nitrate, et des ions zinc, nickel, cobalt, et/ou aluminium. Dans cette composition liquide, le rapport molaire des ions chrome trivalents/ions chrome hexavalents est de 1/9 à 4/1, le rapport molaire (nitrate + sulfate + phosphate)/(ions chrome hexavalents + ions chrome trivalents) est de 0,1 à 2,0 et le rapport molaire ions métal/acide inorganique est de 0,05 à 1. Le revêtement appliqué est ensuite séché. Le film de chromate formé présente une excellente résistance au noircissement et à la rouille blanche.