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1. (WO2018178108) AQUEOUS ACIDIC COMPOSITION FOR TREATING METAL SURFACES, TREATING METHOD USING THIS COMPOSITION AND USE OF TREATED METAL SURFACE

Pub. No.:    WO/2018/178108    International Application No.:    PCT/EP2018/057829
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: C23C 22/34
B05D 7/14
B05D 7/16
C10M 173/02
C09D 5/08
C23C 22/48
C23C 22/53
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
Abstract:
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.