(19)

(11)

EP 2 633 093 A2

(12)

(88) Date of publication A3: 26.07.2012 (43) Date of publication: 04.09.2013 Bulletin 2013/36 (21) Application number: 11837160.8 (22) Date of filing: 28.10.2011

(51) International Patent Classification (IPC):  C22C 21/00(2006.01) C22F 1/04(2006.01) C22C 21/08(2006.01) C22F 1/047(2006.01) (86) International application number: PCT/US2011/058293 (87) International publication number: WO 2012/058542 (03.05.2012 Gazette 2012/18)

(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 RS SE SI SK SM TR (30) Priority: 24.01.2011 US 201161435543 P 29.10.2010 US 408269 P (71) Applicant: Alcoa Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventors: NEWMAN, John, M. Export PA 15632 (US) BOVARD, Francine, S. Monroeville PA 15146 (US) SAWTELL, Ralph, R. Gibsonia PA 15044 (US) (74) Representative: Lenzing Gerber Stute  Partnerschaft von Patentanwälten Bahnstraße 9 40212 Düsseldorf 40212 Düsseldorf (DE)