(19)

(11)

EP 3 491 174 A1

(12)

(43) Date of publication: 05.06.2019 Bulletin 2019/23 (21) Application number: 17828028.5 (22) Date of filing: 01.06.2017

(51) International Patent Classification (IPC):  C25C 3/08(2006.01) C25C 3/10(2006.01) (86) International application number: PCT/NO2017/000018 (87) International publication number: WO 2018/012981 (18.01.2018 Gazette 2018/03)

(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 (30) Priority: 13.07.2016 NO 20161170 (71) Applicant: Norsk Hydro ASA 0240 Oslo (NO)	(72) Inventors: LILLEBY, Anders 6884 Ovre Ardal (NO) HAGEN, Eirik 3941 Porsgrunn (NO) (74) Representative: Berg, André  Norsk Hydro ASA Intellectual Property Department 0240 Oslo 0240 Oslo (NO)