The role of mass transfer in the formation of the composition and structure of CoW coatings electrodeposited from citrate solutions

The effect of the hydrodynamic conditions on the electrode process’s rate and the composition and structure of cobalt-tungsten coatings electrodeposited from citrate solutions is studied. The rate of the electrode process depends on the hydrodynamic conditions. However, the electrochemical impedance data do not reveal the presence of slow diffusion processes. The analysis of the electrochemical impedance spectra shows the occurrence of slow adsorption processes, such as an intermediate adsorption stage. It is assumed that the hydrodynamic conditions have a strong effect on the surface state rather than on the mass transfer from the solution’s bulk to the electrode.