One method of nanomaterials obtaining is electrodeposition of metals into the pores of alumina membranes. For a high aspect ratio membrane (about thousand) there is a problem concerning filling the pores with the metal throughout the depth of the pores due to diffusion limitations of the discharging ions. Usage of pulsed current can increase the concentration of the discharging ions as a result of their diffusion to the surface of discharge during the pause. However, this method has limits [1]. After a certain pause time the value of the reducing process rate begin to decrease until to its total termination. It was shown that one of the reasons leading to decreasing of the reducing rate, in particularly for copper, is corrosion. In this case it is possible that the pore size of the resulting nanowires will influence the corrosion rate. The aim of the present work was a detailed study of the dimensional effect of the corrosion rate of the nanowires ensemble in the deposition electrolyte and in the model corrosion environment. The results confirm the diffusive nature of corrosion with oxygen depolarization that is increasing with stirring and the parallel course of the copper dissolution in the presence in solution of chloride ions. The investigation of nanomaterial corrosion using membranes with different pore sizes in the model solution showed the presence of dimensional effect. With the increasing of pore size the open circuit potential (OCP) becomes more positive. The value of OCP for the sample with a pore size of 200 nm is comparable to the OCP of the bulk sample. It was investigated the changing of OCP values and the potential of copper electrodeposition during the pulsed current. During the process of copper pulsed electrodeposition using the membrane with a pore size of 20 nm, the both of the potentials shifts to negative values. The values of the OCP varies from ~ 0,138 V up to ~ 0,42 V and the deposition potential from ~ 0,65 V to ~1,25 V. A more prolonged exposure of nanocomposite to the deposition electrolyte determine the termination of electrolysis process at 5, 15, 25 min, the OCP shifts to positive values. After a long period of nanocomposites exposure obtained on the membranes of various diameters to the pyrophosphate electrolyte without current the value of OCP of the nanocomposite with a pore size of 20 nm is more positive then OCP of the composite with pore sizes of 100 and 200 nm. It was shown that the nature of the corrosion of electrolytic copper and copper-based nanocomposite membranes with different diameter strongly depends on the composition of the test solutions (pyrophosphate electrolyte solution and the model) and the pore diameter.