SU785775A1 - Device for monitoring galvanic bath current density - Google Patents

Description

one

The invention relates to the field of electroplating and can be used to control the current density in a galvanic bath.

A device for monitoring 5 current density in a galvanic bath, based on measuring the ratio of two electrical quantities and containing an adjustable source of voltage and a logometer, 10 being the voltage across one of the windings of the meter, in turn and opposite to the working voltage of the galvanic bath, The current circuit of the latter is included in the second 5 winding of the logometer 1.

The device allows you to control only the average current density in the bath and has low accuracy of control, due to the influence of the area and shape of parts, the placement of the suspension, the composition and temperature of the electrolyte.

Also known is a device for monitoring current density in a galvanic 25 bath containing a potential difference measuring unit and a probe made of four electrodes located at the vertices of a tetrahedron, one face which is equilateral trio

a square, and three others - isosceles right triangles, the electrode located at the vertex of the right angle of the tetrahedron is common and connected to the first inputs of the channels of the potential difference measuring unit, and the remaining electrodes are alternately connected to the second inputs of the channels of the potential difference measuring unit 2 ,

However, it is characterized by a low control accuracy, since the measurement of current density is carried out without taking into account the change in the resistivity of the electrolyte.

The aim of the invention is to improve the accuracy of control,

This is achieved by the fact that a device for monitoring current density in a galvanic bath containing a probe made of electrodes located at the vertices of a tetrahedron and connected to a potential difference measuring unit consisting of three large-scale converters, and a unit for calculating the current density including three quadrs, connected to the inputs of the adder, the output of which is connected to the input of the square-root extraction unit, is equipped with a conductometric sensor and correction correction consisting of three division blocks, the first input Which of them are connected, respectively, with the outputs of the corresponding scale transducers, the second inputs are with a conductometric sensor, and the outputs are with the inputs of the corresponding quadrants.

The drawing shows a block diagram of a device for monitoring current density in a galvanic bath, I The device consists of point electrodes 1–4, represented by block 5, block 6, and measuring the potential difference containing scale converters 7–9, correction block 10 containing dividing units 11-13, conductometric sensor 14 and a current density calculating unit 15, comprising a three-squares 16-18, an adder 19, a square root extraction unit 20 and an indicator 21.

The device for controlling the current density in the galvanic bath operates as follows.

The electric current flowing through the electroplating bath creates a voltage drop across the electrolyte resistance and in its sections, proportional to the current density in the bath C of block 5, potential differences are removed and, and, and, respectively, 1-3 electrodes relative to electrode 4 and fed to the block 6 measuring potential differences containing scale converters 7-9 with the same conversion factors. The output signals from converters 7-9 are connected to the first inputs of the division blocks 11-13, the correction unit 10, and to the second inputs their blocks receive a signal from the conductometric sensor 14 proportional to the current value of the electrolyte resistivity. From the output of the dividing units 11-13, the signals, the magnitude of which is proportional to the voltage drop in the electrolyte areas and does not depend on the resistivity value of the electrolyte, are transferred to the current density unit 15. The value of current density, as a vector quantity, is calculated with the square of 16 or 16, adder 19, square root extraction unit 20, the input signal of which is the sum of squares, and the output signal is proportional to the current density and indicator 21.

The use of a correction unit and a conductometric sensor in a device for monitoring current density in a galvanic bath allows for a change in the resistivity of an electrolyte, which as a result improves the accuracy of monitoring current density. Improving the accuracy of current density control leads to an improvement in the quality of the deposited coatings, understand. galvanic bath performance, reduced marriage. In addition, accurate measurement of the current density makes it possible to carry out the coating process near the upper limit of the operating range, thereby reducing the electrolysis time and reducing the anode material consumption. Annual economic effect from the introduction

0 of the invention will be 9 thousand rubles. with a production volume of 200 thousand m-.

Claims (1)

Invention Formula A device for monitoring the current density of the galvanic bath containing a probe made of four electrodes located at the vertices of the tetrahedron and connected to a potential difference measuring unit consisting of three large-scale converters, and a current density calculating unit including three quadras connected to the inputs of the adder, the output of which is connected to the input of the square root extraction unit, characterized in that, in order to increase the accuracy, it is equipped with a conductometric sensor and a correction block consisting of three division blocks, the first inputs of which are connected respectively to the outputs of the respective scale transducers, the second inputs - to the conductometric sensor, and the outputs to the inputs of the corresponding squares. ditch  Sources of information taken into account in the examination 1, USSR Copyright Certificate No. 173319, Cl, G 01 R 19/08, 1962, 2, USSR Author's Certificate 503185, class, G 01 R 19/08, 1973.