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Development of an electroless nickel immersion gold process for PCB final finishes

R.W.M. Kwok (Rohm and Haas Electronic Materials Asia Ltd, Fanling, Hong Kong)
K.C.M. Chan (Rohm and Haas Electronic Materials Asia Ltd, Fanling, Hong Kong)
M.W. Bayes (Rohm and Haas Electronic Materials L.L.C., Marlborough, Massachusetts, USA)

Circuit World

ISSN: 0305-6120

Article publication date: 1 September 2004

Abstract

A new generation of electroless nickel immersion gold process has been developed that is targeted to solve the “Black Nickel issue”. The development involved the understanding of the details of the nanostructure of electroless nickel, the interface between Ni and Au, Ni and solder, and the control of the porosity of the Au surface. A suitable increase in phosphorous content in the nickel deposit reduces the hyperactive corrosion during immersion gold process. In addition, a stabilizer system that gives consistent performance across the entire bath life was used to improve the simplicity of bath control. This combination gives many advantages for the applications in printed wiring boards.

Keywords

Citation

Kwok, R.W.M., Chan, K.C.M. and Bayes, M.W. (2004), "Development of an electroless nickel immersion gold process for PCB final finishes", Circuit World, Vol. 30 No. 3, pp. 37-42. https://doi.org/10.1108/03056120410520605

Publisher

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Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited