Patent · US Active

Electrolytic iron metallizing of zinc surfaces

US9309602B2 · kind B2 · utility

2Cited by

4References

14Claims

0Family size

Assignee

Henkel AG & Co. KGaA · DE

Inventors

Michael Wolpers · Erkrath, DE
Marcel Roth · Goldkronach, DE
Jurgen Stodt · Neuss, DE
Andreas Arnold · Werther, DE

Key dates

Filing date	Mar 12, 2013
Grant date	Apr 12, 2016
Priority date	—
Expiry date	Feb 1, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D5/36
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The present invention relates to a method for the metallizing pretreatment of galvanized and/or alloy-galvanized steel surfaces or joined metallic components having at least some zinc surfaces, wherein a thin surface layer of iron is deposited on the zinc surfaces from an aqueous electrolyte containing water-soluble compounds that are a source of iron cations. The method is performed at least partially or continuously under application of an electrolytic voltage, the galvanized and/or alloy-galvanized steel surfaces being connected as cathode. The aqueous electrolyte additionally contains an accelerator selected from oxo acids of the elements phosphorus, nitrogen and/or sulfur, the elements phosphorus, nitrogen and/or sulfur being present in moderate oxidation states.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.