Alternative composition and alternative method for effectively phosphating metal surfaces

Abstract

Described herein is an alternative acidic, aqueous composition for effectively phosphating metallic surfaces, which includes, besides zinc ions, manganese ions, phosphate ions and, preferably, nickel ions, at least one accelerator of a formula R1R2R3C—NO2 where each of the substituents R1, R2 and R3 on the carbon atom is selected, independently of the others, from the group consisting of hydroxymethyl, 1-hydroxyethyl, 2-hydroxyethyl, 1-hydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 1-hydroxy-1-methyl ethyl and 2-hydroxy-1-methylethyl. Also described herein are a method for producing such a composition, an alternative method for phosphating metallic surfaces, and a method of using phosphate coatings produced accordingly.

Dependencies are inferred from the claim text.