EP 3426822 B1 20201021 - FLUORIDE-FREE ZIRCONIUM-BASED METAL PRE-TREATMENT FOR PASSIVATION
Title (en)
FLUORIDE-FREE ZIRCONIUM-BASED METAL PRE-TREATMENT FOR PASSIVATION
Title (de)
FLUORID-FREIE ZIRKONIUM-BASIERTE METALLVORBEHANDLUNG ZUR PASSIVIERUNG
Title (fr)
PRÉTRAITEMENT DE MÉTAUX PAR AGENTS À BASE DE ZIRCONIUM ET EXEMPTS DE FLUORURE À DES FINS DE PASSIVATION
Publication
Application
Priority
- DE 102016203771 A 20160308
- EP 2017051291 W 20170123
Abstract (en)
[origin: WO2017153075A1] The invention relates to a method for the anti-corrosion pre-treatment of metal substrates by using zirconium-based aqueous anti-corrosion agents. The anti-corrosion effect of the zirconium-based agent is based on the presence of polycyclic hydrocarbons that have at least one anellated benzene ring, each having at least two ring-substituted hydroxyl groups in ortho position to each other. The aqueous anti-corrosion agent can be substantially free both of passivating chromium-containing compounds and of fluoride-containing compounds that pickle the metal substrate. According to the invention, pre-treatment by drying (dry-in-place method) is especially advantageous. Accordingly, the method according to the invention is suitable in particular for the pre-treatment of metal strip, wherein excellent anti-corrosion results are achieved on surfaces of aluminum or steel. The invention further relates to a method for producing coated can lids from aluminum strip by using the previously mentioned zirconium-based anti-corrosion agent. A further aspect comprises an aqueous concentrate for providing the ready-to-use anti-corrosion agent.
IPC 8 full level
C23C 22/48 (2006.01); C23C 22/34 (2006.01); C23C 22/53 (2006.01); C23C 22/56 (2006.01)
CPC (source: EP KR US)
B21D 28/00 (2013.01 - US); C23C 22/34 (2013.01 - EP US); C23C 22/48 (2013.01 - EP KR US); C23C 22/53 (2013.01 - EP KR US); C23C 22/56 (2013.01 - EP KR US); C23F 11/04 (2013.01 - 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 2017153075 A1 20170914; AU 2017229193 A1 20180906; AU 2017229193 B2 20221027; BR 112018016295 A2 20181226; BR 112018016295 B1 20230307; CA 3015541 A1 20170914; CN 108699699 A 20181023; CN 108699699 B 20210720; DE 102016203771 A1 20170914; EP 3426822 A1 20190116; EP 3426822 B1 20201021; ES 2831777 T3 20210609; JP 2019513892 A 20190530; JP 7049259 B2 20220406; KR 20180118680 A 20181031; US 11142827 B2 20211012; US 2019010610 A1 20190110
DOCDB simple family (application)
EP 2017051291 W 20170123; AU 2017229193 A 20170123; BR 112018016295 A 20170123; CA 3015541 A 20170123; CN 201780015803 A 20170123; DE 102016203771 A 20160308; EP 17701835 A 20170123; ES 17701835 T 20170123; JP 2018547385 A 20170123; KR 20187026886 A 20170123; US 201816106759 A 20180821