Passivierungszusammensetzung auf Basis von Mischungen von Phosphor- und Phosphonsäuren

Details

Veröffentlichungs-Nr.

EP3663435

Aktenzeichen

EP18210367

Anmeldetag

5. Dezember 2018

Veröffentlichung

13. März 2024

Erteilung

13. März 2024

Rechtsraum

EP

IPC

C23C22/33C23C22/36C23C22/42C23C22/83

Abstract

The present invention provides an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, said composition having a pH of less than 3 and comprising: i) phosphoric acid; ii) at least one water-soluble polyphosphonic acid or a water-soluble salt thereof, wherein said polyphosphonic acid has the general formula (I): <img class="EMIRef" id="657947742-ia01" /> in which: n is at least 2; and, Z is a connecting organic moiety having an effective valency of n, said polyphosphonic acid being characterized in that at least two phosphonic groups are separated by an alkylene bridge having 1 or 2 carbon atoms (C1-C2 alkylene); iii) at least one divalent metal cation (M<2+>); 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): H<p>T<q>F<r>O<s> (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.

Anmelder

Firma

Henkel AG & Co. KGaA

Land

🇩🇪 Deutschland

Fachgebiete