(19)

(11)

EP 2 475 807 A1

(12)

(43) Date of publication: 18.07.2012 Bulletin 2012/29 (21) Application number: 10814008.8 (22) Date of filing: 03.09.2010

(51) International Patent Classification (IPC):  C25C 3/10(2006.01) (86) International application number: PCT/NO2010/000327 (87) International publication number: WO 2011/028132 (10.03.2011 Gazette 2011/10)

(84) Designated Contracting States: 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 SE SI SK SM TR (30) Priority: 07.09.2009 NO 20092968 (71) Applicant: Norsk Hydro ASA 0240 Olso (NO)	(72) Inventors: EICK, Ingo D-53332 Bornheim (DE) KROSCHINSKI, Dirk D-44797 Bocum (DE) (74) Representative: Berg, André  Hydro Aluminium AS Intellectual Property Department 0240 Oslo 0240 Oslo (NO)