Aqueous dispersion for activating a metal surface and method for the phosphating thereof

US12203172B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Christina Angenendt · Straelen, DE
• Jan-Willern Brouwer · Willich, DE
• Hendrik Bussmann · Hamburg, DE
• Franz-Adolf Czika · Neuss, DE
• Ralf Posner · Dormagen, DE
• Sebastian Sinnwell · Goldkronach, DE
• Kristof Wapner · Mülheim an der Ruhr, DE

Key dates

• Filing date: Nov 30, 2020
• Grant date: Jan 21, 2025
• Expiry date: Jun 4, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/10
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous dispersion as a concentrate for the activation stage of phosphating of metal surfaces, containing a dispersed particulate constituent and a thickener, the particulate constituent containing, in addition to dispersed inorganic compounds of polyvalent metal cations, polymeric organic compounds as dispersing agents which are composed at least partially of styrene and/or an α-olefin having no more than 5 carbon atoms and maleic acid, its anhydride and/or its imide, and which additionally comprise polyoxyalkylene units. The aqueous dispersion is further characterized by a D50 value above 10 μm. The present invention also relates to a method for anti-corrosion pretreatment of the surfaces of a metal material, in particular for zinc phosphating.