Three novel models of two-dimensional (2-D) electrocrystallization are presented. These models involve coupling of electrocrystallixation with diffusion. Two of them include additional couplings to metal dissolution from the electrode surface. Potentiostatic current-time transients resulting from these models are presented. The nature of these transients are discussed in context with selected experimental results reported in the literature. These models were found to be useful in the understanding of some unusual features in 2-D eiectrocrystallization. D c S S, K, and K2 B NO it k and I t(t) T, r(T), g and I(T) c= K,K' P * T= i AT n E F3 NOMENCLATURE diffusion coefficient concentration at the interface of the diffusing ion initial value of c the value of bulk solution concentration space coordinate normal to the electrode time the flux of the diffusing ion at Y = 0 the Laplace tranform variable the Laplace transform of e the Laplace transform of F(t) monolayer charge the charge transferred at phase formation/dissolution the phase coverage Avrami's extended area rate constants for the dissolution step the nucleation-growth parameters density of active sites molar volume of the phase radius of a lone centre growth rate constants the current density non-dimensional time, concentration, coverage and current, respectively equilibrium concentration of the metal ion non-dimensional and composite model parameters composite nucleation-growth rate constant dummy variable for time dummy variable for non-dimensional time summation index time interval (non-dimensional) an integer, 2 for instantaneous and 3 for progressive nucleation the potential non-dimensional potential