Evaluation of substrate (Ni)-catalyzed electroless gold plating process

Tetsuya Osaka, T. Misato, J. Sato, H. Akiya, Takayuki Homma, M. Kato, Y. Okinaka, O. Yoshioka

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The substrate (Ni)-catalyzed electroless gold plating process invented by Iacovangelo and Zarnoch has been investigated for plating gold on electroless nickel substrates for application to bonding of electronic devices. The process was found to yield uniform and adherent gold films on Ni-B substrates, whereas on Ni-P substrates acceptable gold films were obtained only when the P content was low and a pretreatment procedure was introduced to prevent the formation of surface oxide or to remove it completely. Unlike the conventional galvanic displacement process, the substrate-catalyzed process does not attack the nickel substrates and yields gold films with a very low porosity. Compared with autocatalytic electroless gold plating baths, the substrate-catalyzed bath is inherently more stable, although the maximum gold thickness obtainable is naturally limited. Results of these evaluations are presented in detail.

Original languageEnglish
Pages (from-to)1059-1064
Number of pages6
JournalJournal of the Electrochemical Society
Issue number3
Publication statusPublished - 2000 Mar


ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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