SU1234775A1 - Method of measuring distribution of current density over surface of metal electrode in conducting medium - Google Patents

Abstract

This invention relates to electrical measuring technology. Can be used in electrochemical studies. The purpose of the invention is to increase the measurement accuracy. The method involves the sectioning of the electrode and sectional registration of the current strength. To improve measurement accuracy, they are limited to splitting the electrode into only two sections and registering the current strength in only one of them. A device for implementing the method comprises an electrolyte bath 1 (10% ammonium nitrate aqueous solution), a cylindrical anode from sections 2 and 3 separated by a dielectric partition 4. The sections are connected to the power source through ammeters 5 and 6. The anode moves along vertically through the opening 7. When moving, the dependence of the current in the controlled section on the coordinate of its movement is determined. The desired current density distribution is reproduced by the derivative of the dependence found. 2 Il. (P

Description

The invention relates to electrical measuring equipment and is intended for use in electrochemical studies.

The purpose of the invention is to improve the measurement accuracy.

Figure 1 shows the electrical circuit of the device for implementing the proposed method of measuring the current density distribution along. metal electrode surfaces in a conductive medium; figure 2 - the dependence of the current in one of the sections of the electrode from the coordinates of its movements and the derivative of this dependence.

Along the axis of the cylindrical bath (cathode) 1. with an electrolyte (10% aqueous solution of ammonium nitrate) the cylindrical anode consisting of sections 2 and 3 separated by a dielectric partition 4 with a thickness of 0.1 mm and connected to to the power source through ammeters 5 and 6. The anode moves vertically through the hole 7 in the bottom of the bath 1. The anode diameter is 7 mm, the diameter and height of the bath are 130 and 25 mm, respectively, and the voltage on the electrodes is 15V.

In the process of moving a two-piece electrode along the electrode-conductive interface, the sum of the currents passing through each section remains constant, since the total contact area of sections 2 and 3 with the conductive medium remains constant. However, when moving, the contact area of one of the electrode sections increases from zero to the maximum value. In this case, the current through this section also increases from zero to the maximum value. The magnitude of the current increment due to the increment of the contact surface is determined by the nature of the current density distribution over the electrode surface. The ratio of these increments, i.e. the derivative of the specified current along the section coordinate, is the dependence of the current density on the electrode surface on the coordinate.

In this case, the values of the Strength of current I, passed through section 3 were measured depending on the depth B of the immersion of this section. The resulting dependence in FIG. 2 is shown as curve a, and the derivative

This dependence is in the form of the curve b, which is the current density j in the system. The accuracy of determining the current density j in the proposed method is not due to the size of the sections, as

in the known technical solution, and the amount of electrode movement between measurements, which is much easier to minimize.

25 f o r m

l and a 3 o b

et e and

A method for measuring the distribution of current density over the surface of a metal electrode. In conductive

the medium, which consists in sectioning the electrode and sectional registration of the current strength, from one side to another, so that, in order to improve the measurement accuracy, only two sections are limited by splitting the electrode and registering the current only - one of them, carry out a longitudinal movement of the formed sections with a constant position of the interface of the electrode conducting medium, determine the dependence of the current in the controlled section on the coordinate of its movement, and the desired density distribution

current is reproduced by the derivative of the found dependence.

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Compiled by L.Morozov Editor A.Ogar Tehred I.Tsopovich Proofreader I.mschschs

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VNIIPI State Committee of the USSR

for inventions and discoveries N3035 Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, the city of Uzhgo |) OD, Proektna str., 4

Claims (1)

25 claims A method for measuring the distribution of current density over the surface of a metal electrode in a conducting medium 30, which consists in sectioning the electrode and sectionally recording the current strength, in that, in order to increase the measurement accuracy, they are limited to breaking the electrode only into two sections and recording current in only one of these sections is carried prodolnoe.peremeschenie formed at a constant location with the interface ₄₀ zhenii electrode conducting medium · determine the dependence of the current in the control th section of its movement on the coordinate, and the desired current density distribution 45 reproduce the derivative found dependence. Ϊ2ΜΊ5