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|1. (WO2018178108) AQUEOUS ACIDIC COMPOSITION FOR TREATING METAL SURFACES, TREATING METHOD USING THIS COMPOSITION AND USE OF TREATED METAL SURFACE|
|Applicants:||TATA STEEL IJMUIDEN B.V.
AD INTERNATIONAL B.V.
|Inventors:||DANE, Chiel Matthias
VAN DER NET, Richard Johannes
|Title:||AQUEOUS ACIDIC COMPOSITION FOR TREATING METAL SURFACES, TREATING METHOD USING THIS COMPOSITION AND USE OF TREATED METAL SURFACE|
In a first aspect the invention relates to an aqueous acidic composition for treating metal surfaces, said composition comprising the following components: a) at least one water soluble or water dispersable anionic polyelectrolyte; b) at least one organofunctional silane comprising one or more reactive functional groups selected from the group comprising amino, mercapto, methacryloxy, epoxy and vinyl; c) at least one water dispersible solid wax wherein the weight ratio between components a:b is in the range of 1:2-4:1, based on dry matter; the weight ratio between components (a+b): c is in the range of 1:3-3:1, based on dry matter, and wherein components a and b may be present -at least partially - as their graft reaction product. Other aspects of the invention concern a treating method using this composition and use of the thus treated metal surface.