Electrodeposition of AuCo alloys and multilayers
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AuCo alloys and Au/Co multilayers have been fabricated by electrodeposition from non cyanide-containing electrolytes. The effect of pH and citric acid concentration on the deposit composition and current efficiency was investigated. Results showed that a lower citric acid concentration (0.47 m) at pH 6.15 was favored for multilayered Au/Co deposits with disparate compositions in each layer. An increase in the citric acid concentration or pH requires a larger applied current density to achieve the same cobalt concentration, and results in a drop of current efficiency.
Keywordscobalt–gold alloys electrodeposited AuCo multilayer non-cyanide electrolyte
The authors gratefully acknowledge NSF for support of this work under Grant NIRT- NSF (#CTS-0210832) and the Louisiana State University Center for Biomodular Multi-Scale Systems. Also X. Xie and C. Henk are warmly acknowledged for their help in SEM and TEM analyses.
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