Kinetics of Sn and Co codeposition in citrate solutions
The model of mass transport taking into account mobile chemical interactions in the Nernst-type diffusion layer is used for the estimation of surface concentration of Sn(II) and Co(II) citrate complexes. The analysis of the solution composition indicates that the complexation degree of Sn(II) is muc...
Saved in:
Published in | Electrochimica acta Vol. 46; no. 4; pp. 571 - 577 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
01.12.2000
Elsevier |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The model of mass transport taking into account mobile chemical interactions in the Nernst-type diffusion layer is used for the estimation of surface concentration of Sn(II) and Co(II) citrate complexes. The analysis of the solution composition indicates that the complexation degree of Sn(II) is much higher than that of Co(II) in the ligand-deficient slightly acid media. This fact makes it possible to choose optimal concentrations of solutions wherein equilibrium potentials of Sn and Co are close. The kinetics of SnLH
− reduction in cobalt-free solutions may be described quantitatively within the framework of the model with cathodic
α=0.7 and the exchange current density
i
o=6 mA cm
−2. A similar mechanism provides the best fit for a partial process of Co(II) reduction in solutions containing Sn(II). The effect of Co(II) on the kinetics of Sn(II) reduction may be interpreted on the assumption that SnL
2− species may also be treated as an electrically active complex. |
---|---|
Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/S0013-4686(00)00633-2 |