(19)

(11)

EP 3 555 330 A2

(12)

(88) Date of publication A3: 26.07.2018 (43) Date of publication: 23.10.2019 Bulletin 2019/43 (21) Application number: 17880259.1 (22) Date of filing: 13.12.2017

(51) International Patent Classification (IPC):  C22C 21/00(2006.01) C25C 7/02(2006.01) C22C 21/06(2006.01) H01B 1/02(2006.01) (86) International application number: PCT/US2017/066053 (87) International publication number: WO 2018/112018 (21.06.2018 Gazette 2018/25)

(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 Designated Extension States: BA ME Designated Validation States: MA MD TN (30) Priority: 15.12.2016 US 201662434739 P (71) Applicant: Arconic Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventors: WEILAND, Hasso Lower Burrell, Pennsylvania 15068 (US) RALPH, Elizabeth Murrysville, Pennsylvania 15668 (US) (74) Representative: Barton, Matthew Thomas  Forresters IP LLP Skygarden Erika-Mann-Strasse 11 80636 München 80636 München (DE)