Patent ID: 9481935
Filing Date: 2016-11-01
CPC Classification: C08G,C09D,C09J,C23C,C23F

Claim Text:
1. An aqueous composition for pretreating a metallic surface before further coating or for treating said surface, prepared by the process comprising the steps of: adding to water a) at least one water glass selected from the group consisting of sodium water glass, potassium water glass and ammonium water glass; and b) a silane, wherein the water glass is added in an amount of 0.5 to 30% by weight of the aqueous composition, and the silane is added in an amount of 0.05 to 2% by weight of the aqueous composition, and wherein the silane is an aminosilane selected from the group consisting of a gamma-ureidopropyltrialkoxysilane, N-(3-(trimethoxysilyl)propyl)ethylenediamine, N-beta-(aminoethyl) -gamma-aminopropyltriethoxysilane, N-beta-(aminoethyl)-gamma-aminopropyltrimethoxysilane, N-(gamma-triethoxysily wherein the aqueous composition further comprises an organic corrosion inhibitor selected from the group consisting of a heterocyclic compound, a carbonic acid amide and an acetylacetonate, wherein the organic corrosion inhibitor is present in an amount of from 0.01 to 3% by weight of the aqueous composition.