FIELD: electrolytic processes. SUBSTANCE: method includes passing predetermined one-direction current through electrode-electrolyte interface and measuring overpotential. A part of electrode is subjected to initial elastic stretching deformation and additional periodical elastic deformation with fixed frequency. Deformation-free electrode part is powered and one selectively isolates amplitude and phase of overpotential first harmonic at deformation frequency. Further, one records current-dependence of overpotential harmonic amplitude and, from relationship between amplitudes, overpotential and deformation, determines overpotential derivative on the basis of elastic deformation. From derivative, one isolates a constituent invariant to current density. Contributions of variable resistances of electrode and electrolyte are mutually compensated. Electrode comprises wire immersed into liquid electrolyte stretching between upper and lower clamps and connected to power terminal. Wire is bent in the form of U-shaped loop enveloping lower clamp and joined with upper one in a few points. Current terminal is constructed in the form of two leads electrically isolated from each other, each of the leads being connected with one end of wire and located separately from upper clamp, which is, in turn, connected through rod with arrangement providing deformation. Wire is fastened to the upper clamp in the form of two coils with gaps between windings. EFFECT: Improved structure of device. 15 cl, 12 dwg
