SU503185A1 - Instrument for determining current density in a galvanic bath - Google Patents

Description

one

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

Instruments are known for monitoring current density in a galvanic bath containing a probe and a potential difference measuring unit.

A disadvantage of the known devices is the need for precise orientation of the electrodes along the direction of the electric field power lines and low accuracy of control of the current density due to a change in the direction of the power lines in connection with changes in the configuration, shape, size of the products being processed and their number on the suspensions.

To improve the accuracy of current density control in the proposed device, the probe is made of four electrodes located at the vertices of a tetrahedron, one side of which is an equilateral triangle, and three others are isosceles right triangles, and the electrode located at the vertex of the right angle of the tetrahedron is It is common and connected to the first inputs of the channels of the potential difference measuring unit, while the remaining electrodes are alternately connected to the second inputs of the channels of the potential difference measuring unit.

FIG. Figure 1 shows the layout of the point electrodes in the bath; in fig. 2 is a block diagram of an instrument for monitoring current density.

The proposed device consists of point electrodes 1-4, represented by block 5, a potential difference measuring node 6, containing scale converters 7-9 and block 10 for calculating current density, which contains functional converters 11-13, summing device 14, square root extractor 15 and indicator 16. The electric current flowing through

a galvanic bath creates a voltage drop across the electrolyte resistance and in its parts, which is proportional to the current density in the bath. The projection of the voltage drop, as a vector signal, onto the rectangular axis

Coordinate systems are potential differences (Ui, Uz, Uz), respectively, of electrodes 1-3 relative to electrode 4. The potential differences Ub Uz and are removed from block 5 and fed to potential difference measuring unit 6, containing scale converters 7-9 with the same coefficients conversions, the output signals of which are fed to the current density calculation unit 10, consisting of functional converters 11-13, have performed an operation

squaring the input signals, the summing device 14 that performs the summing operation of the squares of these signals, the square root extractor 15, whose input signal represents the sum of squares, and the output, as a vector quantity, determined through its scattering in the rectangular coordinate system, is proportional to current density in the electroplating bath, and the indicator 16.

Claims (1)

Invention Formula A device for monitoring current density in a galvanic bath containing a probe and A potential difference measuring unit, characterized in that, in order to improve accuracy, the probe is made of four electrodes located at the vertices of a tetrahedron, one side of which is an equilateral triangle, and the other three are equilateral triangular triangles, and the electrode located at the top the right angle of the tetrahedron is common and connected to the first inputs of the channels of the potential difference measuring unit, while the remaining electrodes are alternately connected to the second inputs of the channels of the potential difference measuring unit al. one L Pve. one Fig 7