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1. (WO2017194187) CONVERSION COATINGS FOR METAL SURFACES

Pub. No.:    WO/2017/194187    International Application No.:    PCT/EP2017/000560
Publication Date: Fri Nov 17 00:59:59 CET 2017 International Filing Date: Sat May 06 01:59:59 CEST 2017
IPC: C23C 22/34
C23C 22/72
Applicants: SURTEC INTERNATIONAL GMBH
Inventors: VOLK, Peter
Title: CONVERSION COATINGS FOR METAL SURFACES
Abstract:
The invention relates to an aqueous treatment solution for producing conversion coatings on metal surfaces, particularly on zinc or zinc alloy surfaces, said solution containing: Cr(III) ions at an amount of 0.1 g/l to 8.0 g/l, zirconium and/or titanium ions at an amount of 0.1 g/l to 15 g/l, organosilane-modified silicon oxide nanoparticles at an amount of between 0.1 g/l to 50 g/l, and fluoride at an amount of 0.1 g/l to 10 g/l. The claimed treatment solution allows metal materials to obtain a high level of corrosion protection, with the decorative and functional properties of the surfaces simultaneously being achieved or improved. It is also possible to avoid known problems when using heavy metal ions, particularly cobalt and chromium(VI) ions.