Global Patent Index - EP 3230490 A1

EP 3230490 A1 2017-10-18 - OPTIMISED OPERATION IN ANTI-CORROSION PRETREATMENT OF METAL USING FLUORIDE BATHS

Title (en)

OPTIMISED OPERATION IN ANTI-CORROSION PRETREATMENT OF METAL USING FLUORIDE BATHS

Title (de)

OPTIMIERTE PROZESSFÜHRUNG IN DER KORROSIONSSCHÜTZENDEN METALLVORBEHANDLUNG AUF BASIS FLUORID-HALTIGER BÄDER

Title (fr)

CONDUITE DE TRAITEMENT OPTIMISÉE POUR LE PRÉ-TRAITEMENT ANTI-CORROSION DU MÉTAL SUR LA BASE DE BAINS RICHES EN FLUORURE

Publication

EP 3230490 A1 (DE)

Application

EP 15804502 A

Priority

  • EP 14197667 A
  • EP 2015078511 W

Abstract (en)

[origin: CA2970405A1] The present invention relates to an anti-corrosion treatment method where a series of components having metallic surfaces of iron and/or zinc are contacted with a passivating aqueous pretreatment solution which is located in a system tank and contains compounds of the elements zirconium and/or titanium and also a source of fluoride ions. In the method of the invention a portion of this pretreatment solution is discarded and replaced by an in total at least equal volume portion of one or more such supplemental solutions, which are metered into the pretreatment system tank. While the discard must not exceed a predetermined level, depending on the molar ratio of the elements fluorine to zirconium and/or titanium, in order to ensure a permanently satisfactory anti-corrosion treatment even when not using any chemicals at all to regulate the pickling rate or stabilize the ionic load, the way in which supplemental solution is metered in ensures maintenance of the concentration of the elements zirconium and/or titanium in the passivating aqueous pretreatment solution in the form of water-soluble compounds.

IPC 8 full level (invention and additional information)

C23C 22/34 (2006.01); C23C 22/86 (2006.01)

CPC (invention and additional information)

C23C 22/34 (2013.01); C23C 22/86 (2013.01)

Citation (search report)

See references of WO 2016091713A1

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

Designated extension state (EPC)

BA ME

EPO simple patent family

EP 3031951 A1 20160615; EP 3031951 B1 20171004; CA 2970405 A1 20160616; CN 107002245 A 20170801; EP 3230490 A1 20171018; ES 2654893 T3 20180215; JP 2017537229 A 20171214; KR 20170110575 A 20171011; MX 2017007556 A 20171031; PL 3031951 T3 20180330; TW 201631212 A 20160901; US 2017283955 A1 20171005; WO 2016091713 A1 20160616

INPADOC legal status


2018-03-21 [DAV] REQUEST FOR VALIDATION OF THE EUROPEAN PATENT (IN ANY COUNTRY) (DELETED)

2018-03-21 [DAX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT (TO ANY COUNTRY) (DELETED)

2017-10-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20170515

2017-10-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): 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

2017-10-18 [AV] REQUEST FOR VALIDATION OF THE EUROPEAN PATENT IN:

- Countries: MA MD

2017-10-18 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: BA ME