New insight into the anomalous codeposition of alloys

Citation
Zl. Li et al., New insight into the anomalous codeposition of alloys, T I MET FIN, 77, 1999, pp. 149-151
Citations number
31
Categorie Soggetti
Metallurgy
Journal title
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
ISSN journal
00202967 → ACNP
Volume
77
Year of publication
1999
Part
4
Pages
149 - 151
Database
ISI
SICI code
0020-2967(199907)77:<149:NIITAC>2.0.ZU;2-3
Abstract
A new model for the anomalous codeposition of alloys is based on the kineti c characteristics of metal electrodeposition and th effect of hydrogen evol ution accompanying the deposition. The less noble metal has intrinsically f aster kinetics and so tis deposition rate can be controlled manly by diffus ion mass transfer in a certain range of over potentials; the convection ind uced by hydrogen evolution can speed up the relative deposition rate of thi s less noble metal when it is mainly diffusion-influenced. In contrast with previous models, such as the hydroxide suppression hypothesis, the monohyd roxide-discharge-controlled mechanism, and the competitive adsorption effec t, our model can explain naturally and completely anomalous codeposition, i .e. the preferential deposition of the less-noble metal, oa problem in allo y electrodeposition that has persisted for a century.