An interpretation of the Zech-Podlaha-Landolt model of metal codeposition via queuing theory

The electrode kinetics of anomalous codeposition of iron group metals is in terpreted by queuing theory applied to the recently proposed Zech-Podlaha-L andolt model which postulates an adsorbed mixed-metal species existing temp orarily as an electrochemically activated complex. The complex acts as an i ntermediate in a consecutive reaction leading to enhanced deposition of the more electronegative metal. Numerical illustrations for the codeposition o f iron and nickel, and cobalt and nickel from a sulphate electrolyte are pr ovided.