Jukka, Your Nuronex309B is probably Neutronex309 solution. If so, it is free of cyanides. Your Ni oxide removal process can be achieved as suggested previousely (my e-mail of Jan. 3, 05). Though, since the gold plating solution pH is probably 9 or higher, you may do the actual rinsing with DI water (after acid treatment) and then proceed with plating. This will minimize the exposure of Ni to alkaline solution prior to electroplating. Igor Kadija www.fibrotools.com ----- Original Message ----- From:To: Sent: Monday, January 03, 2005 4:28 AM Subject: [mems-talk] Plating Au on Ni. Hello, We are making process where we would like to plate gold features using thick PR-mold. Process we had in mind was following: 1. Evaporate Ni layer on GaAs-wafer. 2. Make thick PR-mold 3. Plate Au-trough mold on Ni 4. Remove PR 5. Etch Ni away using plated Au as a etch mask However we have problems with plating on Ni. It just is not plating anything. Should we try to make some pretreatment to Ni before try to plate Au? We have fresh and clean chemical with correct pH. Also plating Au on Au is working correctly. We are making our plating with Enthone Nuronex 309B plating solution (should be same stuff than Microfab Au150). Best regards, Jukka Viheriälä *********************************************** Jukka Viheriälä, Researcher Optoelectronics Research Centre Tampere University of Technology P.O. Box 692 FIN-333101 Tampere, Finland Tel.: +050 595 4147 Fax +358 3 3115 3400 Email: Jukka.Viheriala@orc.tut.fi _______________________________________________ MEMS-talk@memsnet.org mailing list: to unsubscribe or change your list options, visit http://mail.mems-exchange.org/mailman/listinfo/mems-talk Hosted by the MEMS Exchange, providers of MEMS processing services. Visit us at http://www.memsnet.org/