During too long electrocrystallisation of dendritic copper on cathode rods the surface deposit lay restructures from branched dendritic one to rough globule scrabs. Overpotential boundary conditions are determined (η_bound) by means of chronogalvanometry method in series of constant cathodic overpotentials. This overpotential (–0,55 V) corresponds the change on control nature on deposit growth front (from mixed to pure diffusion one).The duration of continuous deposit crystallization which corresponds to η_bound, achievement forms 1,6–1,8 hour against technological 2 hours.