Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 13, Pages 4520-4527Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.01.018
Keywords
electroplating; amorphous; gold-nickel; tungsten-free; alloy
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It was found that, by choosing an optimum bath composition, amorphous Au-Ni alloy containing up to 40 at.% of Au with respect to the sum of Au and Ni can be electrodeposited from a bath prepared by excluding tungsten from the Au-Ni-W bath that we developed previously. Elemental analysis showed that the deposit contains 15-20 at.% of carbon and 2 at.% of nitrogen. Hardness of this deposit is almost three times as high as that of the conventional hard gold. The electrical contact resistance measured against a pure gold wire is comparable to that of the hard gold. The amorphous structure of the Au-Ni deposit is stable at temperatures up to 300 degrees C for at least 1 h. The amorphous tungsten-free Au-Ni deposit is worthy of consideration for applications in the fabrication of micro- and nano-scale electrical contacts. (c) 2008 Elsevier Ltd. All rights reserved.
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