EP 2867390 A1 20150506 - METHOD FOR PRODUCING TINPLATE AND PRODUCT PRODUCED THEREWITH
Title (en)
METHOD FOR PRODUCING TINPLATE AND PRODUCT PRODUCED THEREWITH
Title (de)
VERFAHREN ZUR PRODUKTION VON WEISSBLECH, UND DAMIT HERGESTELLTER GEGENSTAND
Title (fr)
PROCÉDÉ DE FABRICATION DE FER BLANC ET ARTICLE FABRIQUÉ AVEC CELUI-CI
Publication
Application
Priority
- EP 12174561 A 20120702
- EP 2013063912 W 20130702
- EP 13733301 A 20130702
Abstract (en)
[origin: WO2014006031A1] The invention relates to a method for forming a passivation layer on a strip of packaging steel for producing a packaging container or a can, said strip having at least one tinplated surface having excellent sulphide staining resistance. The method comprises the steps of: (i) subjecting said tin-plated surface to an anodic treatment at a pH of from 8 to 12 in a suitable aqueous electrolyte, wherein the suitable electrolyte is a phosphate solution, borate solution, sulphate solution or a carbonate solution, wherein the electrolyte for the anodic treatment does not contain mono-atomic halogen anions (Group 17) such as CI-, F-, wherein the thickness of the tin oxide layer (D), expressed in Coulomb/m2 and representing the total charge needed to reduce the layer to metallic tin is related to anodic treatment time (t), current density (A) by D = E x A x t, where E is the efficiency of the electrochemical reaction, and wherein D is at least 30 C/m2; wherein the electrolyte comprises monoatomic cations from Group 1 or 2 from the periodic table or polyatomic cations, and polyatomic anions; (ii) optionally rinsing and drying the anodically treated tin-plated surface - subjecting the anodically treated tin-plated surface to a chemical passivation treatment free from using hexavalent chromium compounds; (iii) drying of the passivated anodically treated tin-plated surface; (iv) final processing such as oiling, winding, cutting etc.
IPC 8 full level
C25D 5/48 (2006.01); C25D 3/30 (2006.01); C25D 11/34 (2006.01)
CPC (source: EP)
C23C 22/76 (2013.01); C25D 5/48 (2013.01); C25D 11/34 (2013.01); C25D 3/30 (2013.01)
Citation (search report)
See references of WO 2014006031A1
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
DOCDB simple family (publication)
WO 2014006031 A1 20140109; EP 2867390 A1 20150506; EP 2867390 B1 20170906; ES 2644868 T3 20171130; RS 56562 B1 20180228
DOCDB simple family (application)
EP 2013063912 W 20130702; EP 13733301 A 20130702; ES 13733301 T 20130702; RS P20171072 A 20130702