Kinetics of electrodeposition of composite electrochemical coating of nickel-cobalt-aluminum oxide

The kinetic features of the process of electrodeposition of a wear- and corrosion-resistant composite electrochemical coating (CEC) nickel-cobalt-aluminum oxide from a colloidal chloride electrolyte are studied. The use of potentiodynamic, chronopotentiometric and temperature-kinetic methods, as well as the use of the calculated values of the temperature coefficient of the reaction rate and the diffusion coefficients of nickel ions, made it possible to establish the mechanism of CEC electrodeposition. An analysis of the research data on the kinetic features of CEC electrodeposition showed that the nature of the slow stage of the studied process is due to the electrophoretic transfer of electroactive particles to the cathode and the stage of overgrowth of dispersed particles adsorbed on the cathode surface with electrodeposited metals, proceeding at comparable rates.