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(11)

EP 1 863 953 A1

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(43) Date of publication: 12.12.2007 Bulletin 2007/50 (21) Application number: 06723909.5 (22) Date of filing: 27.03.2006

(51) International Patent Classification (IPC):  C25C 3/24(2006.01) C25C 3/06(2006.01) C22B 21/00(2006.01) C25C 3/18(2006.01) (86) International application number: PCT/EP2006/002949 (87) International publication number: WO 2006/103085 (05.10.2006 Gazette 2006/40)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 31.03.2005 EP 05075752 (71) Applicant: Aleris Aluminum Koblenz GmbH 56070 Koblenz (DE)	(72) Inventors: VAN DER PLAS, Dietrich, Willem NL-2014 CS Haarlam (NL) XIAO, Yanping NL-2628 RX Delft (NL) (74) Representative: Schinkel, Reta et al Müller Schupfner Patentanwälte Bavariaring 11 80336 München 80336 München (DE)