Regular codeposition

Regular codeposition assumes transport-controlled codeposition in which diffusion of metal ions of both metals is a rate-determining step in the overall codeposition reaction [1, 5]. 

Classification of different types of alloy electrodeposition was made by Brenner [3] in 1962, by defining five groups equilibrium, irregular, regular, anomalous, and induced codeposition. More detailed explanations including samples for each type were given in Ref. [5]. 

If mixed complexes containing metals to be codeposited are not formed in the solution, regularities of mass transport remain the same as considered in Chapter 3 ... 

Most of regularities that are typical of partial processes persist in the case of codeposition of Cu and Sn. Typical cathodic voltammograms are shown in Figure 9.35. Several regions corresponding to different electrochemical processes may be distinguished. Cu(II) reduction starts at its equilibrium potential equal to 0.24 V. It follows from Nernst equation that similar characteristic of Sn Sn + electrode is -0.24 V therefore, the phase consisting of free tin should be stable at more... 

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