Brenners Alloy Classification

Alloys are usually classified following a phenomenological suggestion of Brenner. For his definition Brenner used a so-called composition reference line. On this basis the mole fraction of the component A in the alloy can be plotted versus the concentration ratio in the electrolyte /(c + Cg) (actually the mole fraction of ions A in the electrolyte, Eq. (8.5))  

Brenner distinguished between a normal and abnormal alloy deposition 

Deposition is as expected from the equilibrium potentials of the components. 

Within this group there are three subgroups  

Deposition is unexpected because of the equilibrium potentials in this group two subgroups were defined  

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Figure 8.1 Voltammogram of CuNi alloy deposition with partial currents of Cu and Ni deposition and total deposition current (a) copper deposition, (b) irregular co-deposition, (c) regular co-deposition. The names of the different alloy deposition regions refer to the classification of Brenner (see the following section).

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]. 

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