METHOD FOR PHOSPHATATION OF RAPIDLY MOVING BANDS IN CONTINUOUS ASSEMBLIES

FIELD: metallurgy. SUBSTANCE: phosphatation of rapidly moving bands in continuous cold-rolled and hot-galvanized steel assemblies is performed at 50- 75 C for 3-6 s in solution containing, g/l: PO3-4, 8.5-9.2; NO-3, 6.3-6.5; Zn2+, 4- 4.7; CIO-3, 2.7-4; and Ni2+, 0.3-0.45; followed by passivation at...

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Hauptverfasser:	KHROMOVA L.M, GERASIMOV N.A, CHUMAEVSKIJ V.A, KON'SHIN A.P, MJAKISHEVA E.A, ROGACHEV V.V
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:	FIELD: metallurgy. SUBSTANCE: phosphatation of rapidly moving bands in continuous cold-rolled and hot-galvanized steel assemblies is performed at 50- 75 C for 3-6 s in solution containing, g/l: PO3-4, 8.5-9.2; NO-3, 6.3-6.5; Zn2+, 4- 4.7; CIO-3, 2.7-4; and Ni2+, 0.3-0.45; followed by passivation at 40-50 C for 1-3 s in solution containing 0.15-0.25 g/l sodium ethylenediaminetetraacetate and 0.12-0.2 g/l sodium nitrite. EFFECT: considerably increased corrosion resistance and waterproofness of undyed coating. 1 cl, 4 ex