Induced Codeposition: II. A Mathematical Model Describing the Electrodeposition of Ni‐Mo Alloys

A steady‐state mathematical model was developed to predict the behavior of the induced codeposition of Ni‐Mo alloys in the kinetic and mass‐transport controlled regions on rotating cylinder electrodes. The kinetic regions were characterized by a simple Tafel expression. A Nernst boundary layer representation described the mass transfer of ions through a diffusion layer. The governing features of the induced codeposition mechanism included soluble nickel acting as a catalyst to the molybdenum deposition and the generation of an absorbed intermediate species on the electrode surface. The resulting alloy composition was simulated for two electrolytes over a wide range of current densities and electrode rotation rates. The model predictions agreed with the observed trends in the experimental data.