ABSTRACT
Mass transfer is one of the main stages of an overall electrochemical reaction where the cationic transport can occur in three main modes. Migration represents the transport under the influence of the electric field, diffusion–under the influence of a concentration gradient or by natural or forced convection, from solution mass to the electrode surface, to replace particles consumed during the electrochemical reaction. An experimental investigation of cathodic metal deposition kinetics is a complicated operation, due to the process characteristic features. In general it was too complicated to determine the “participation” of each of the stages of electrochemical reactions at the overvoltage, but theoretically, limit cases can be treated in which the overvoltage is due to a single stage. Mass transfer overvoltage is determined by concentration changes near the electrode, as a result of a too slow transport of reactant species from or into the solution.
