PASSIVATION COMPOSITION BASED ON MIXTURES OF PHOSPHORIC AND PHOSPHONIC ACIDS

The present invention provides an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, comprising:i) phosphoric acid;ii) at least one water-soluble polyphosphonic acid or a water-soluble salt thereof,iii) at least one divalent metal cation (M2+); and,iv) at least one wat...

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Bibliographische Detailangaben
Hauptverfasser:	Kumar, Girdhare, Vijay, Meenu, Jadhav, Aditi
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS 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 ORGANIC CHEMISTRY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	The present invention provides an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, comprising:i) phosphoric acid;ii) at least one water-soluble polyphosphonic acid or a water-soluble salt thereof,iii) at least one divalent metal cation (M2+); and,iv) at least one water-soluble or water-dispersible fluoroacid or a salt thereof, wherein said fluoroacid is defined by the following general empirical formula (II):HpTqFrOs (II)wherein: each of q and r represents an integer from 1 to 10;each of p and s represents an integer from 0 to 10; and,T represents an element selected from the group consisting of Ti, Zr, Hf, Si, Sn, Al, Ge, and B.