SU846610A1 - Method of measuring the surface area of part at electroplating - Google Patents

Description

(54) METHOD FOR DETERMINING A SURFACE DETAIL AREA AT GALBVAN DISCHARGE

I

The invention relates to electroplating and can be used in an automatic process for the production of metallic coatings on electroplating lines.

There is a known method for determining the surface area of a part during galvanic deposition, which includes immersing the part and, an additional electrode in the electroplating bath, passing current through them, measuring electrical parameters and calculating the surface area by the formula 1.

The disadvantage of this method is errors in determining the surface area introduced by electrode processes that take place when the electrolytic bath is supplied with a constant current.

The purpose of the invention is to increase the accuracy of determining the surface area by eliminating the influence of electrode processes on the measurement results.

The goal is achieved by the fact that. according to the method of determining the surface area of the part, which includes immersing the part and the additional electrode in the α-galvanic bath, passing current through them, measuring the electrical parameters and calculating the surface area using

alternating current with a frequency of 100-150 kHz is passed through the part and the additional electrode, the difference in voltage across them is measured and the surface of the part is calculated using the formula

S 18 Di 2di + 0.48, where S is the surface area of the part;

whether - the difference of the voltage across the part and the additional electrode.

FIG. 1 shows a block diagram of an apparatus for implementing the proposed method; in fig. 2 - functional diagram

10 converter; in fig. 3 is a graph of functional dependence.

The device consists of a generator 1, a ballast 2, an additional electrode 3, a part 4, a bath 5, a differential amplifier 6, a functional converter 7 and an indicator 8.

The device works as follows.

Measured part 4, for example, with an area of 0.2-1.5 m, is immersed in bath 5 and 20 through ballast resistance 2 is connected to alternating voltage generator 1. In the bath there is also an additional electrode 3 of a known area, for example

0.2 m, connected to the generator 1 through the same ballast resistance 2. The currents flowing in the circuit create a voltage drop in the areas of the measured part - bath - Uj and additional electrode - bath - U. If the area of the part and the additional electrode are equal , To-U (Uj If the area of the measured part is larger, then the voltage drop on it is less, i.e., a relationship is observed inversely proportional to U2 and the area of the part (Fig. 3). The difference voltage di Uj and g amplified by differential amplifier 6 and fed to

0.5 1.0

1.5

Claims (1)

When supplying electrodes with direct current, electrode processes are different for different materials. Therefore, the same surface areas of different materials have different sized electric fields in the bath, which leads to errors in determining the surface area. When powering the electrodes with a current frequency of 100-150 kHz, the electronic invention does not improve the accuracy of measuring the surface area, as a result of which the quality of electroplating coatings is improved. Claim Method A method for determining the surface area of a part during galvanic deposition, including immersing the part and an additional electrode in a galvanic bath, passing current through them, measuring electrical parameters and calculating the surface area by a formula, characterized in that, in order to improve the accuracy, an opfunctional converter 7 performing , the materialization of the functional dependence S f (AU), and further to the indicator 8. The functional converter 7 implements the functional dependence S f (dO), n re-transform the continuous function of S 18d2 - 2 di –f 0.48 into piecewise continuous (graph of realized piecewise continuous function in Fig. 3). Based on the reduced functional transducer of the function S f (DL), which, when determining the surface area, implements the experimental data. These data are given in table. one. Table 1 Oh, 46 0.92 1.41 native processes means the material of the parts does not affect the accuracy of the surface area measurement. In tab. 2 shows the output signal of the device measuring the area of the constant and alternating (150 kHz) currents, depending on the material of the part with the same area of 0.5 m Table 2 defines the surface area by varying the influence of electrode processes on the measurement results, an alternating current with a frequency of 100-150 kHz is passed through a part and an additional electrode, the voltage difference between them is measured and the surface area of the part is calculated using the formula S 18di2 - 2di + 0.48, where S is the surface area of the part; d is the difference in voltage across the part and the additional electrode. Sources of information taken into account in the examination I. USSR author's certificate 484390, cl. G 01 B 19/30, 1973. uUsx 2I L / s / Iffw R9