EP 3704286 B1 20231206 - PROCESS AND COMPOSITION FOR TREATING METAL SURFACES USING TRIVALENT CHROMIUM COMPOUNDS
Title (en)
PROCESS AND COMPOSITION FOR TREATING METAL SURFACES USING TRIVALENT CHROMIUM COMPOUNDS
Title (de)
VERFAHREN UND ZUSAMMENSETZUNG ZUR BEHANDLUNG VON METALLOBERFLÄCHEN UNTER VERWENDUNG DREIWERTIGER CHROMVERBINDUNGEN
Title (fr)
PROCÉDÉ ET COMPOSITION POUR TRAITER DES SURFACES MÉTALLIQUES À L'AIDE DE COMPOSÉS DE CHROME TRIVALENT
Publication
Application
Priority
- US 201762578787 P 20171030
- US 2018057533 W 20181025
Abstract (en)
[origin: WO2019089347A1] Aqueous compositions useful as pretreatments prior to painting to reduce the formation of rust in the uncoated condition. The compositions consist essentially of water, a trivalent chromium compound with the formula Cr(HxPO4)3, where x can be 1.5 or 2, a silica compound, and optionally hydrogen peroxide. The composition may have a pH between about 1 and about 4. A process for treating a metal surface includes contacting the surface with such aqueous compositions. The compositions and the processes provide benefits in comparison to the zinc phosphate metal pretreatment thought to be the standard in the industry.
IPC 8 full level
C23C 22/10 (2006.01); C23C 22/08 (2006.01); C23C 22/33 (2006.01)
CPC (source: EP KR US)
C23C 22/08 (2013.01 - EP KR); C23C 22/10 (2013.01 - EP KR US); C23C 22/33 (2013.01 - EP KR US); C23C 2222/10 (2013.01 - EP KR US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2019089347 A1 20190509; BR 112020008635 A2 20201006; CA 3079516 A1 20190509; CN 111356786 A 20200630; EP 3704286 A1 20200909; EP 3704286 B1 20231206; JP 2021501263 A 20210114; KR 20200081415 A 20200707; MX 2020004244 A 20200729; US 2020325582 A1 20201015
DOCDB simple family (application)
US 2018057533 W 20181025; BR 112020008635 A 20181025; CA 3079516 A 20181025; CN 201880069568 A 20181025; EP 18804756 A 20181025; JP 2020524020 A 20181025; KR 20207014731 A 20181025; MX 2020004244 A 20181025; US 201816759959 A 20181025