SU1548275A1 - Electroplating apparatus - Google Patents

Abstract

The invention relates to equipment for electroplating. The purpose of the invention is to improve the quality of the coating. The device contains an adjustable source 1 with current reversal, a metal flow metering circuit 3 consisting of a series-connected current sensor 5, a differential amplifier 6, a polarity converter 7, a voltage-to-frequency converter 8, a memory element in the form of a reversible counter 9 and an element display in the form of an electric meter 10. Moreover, the control input of the reversible counter 9 is connected to the output signal of the polarity of the converter 7. The current density on the bath is measured by the current sensor 11, which determines directly The current in the electrolyte solution, the signal from which is fed to the coating thickness control circuit 4, which consists of a series-connected current density-to-voltage converter 12, a voltage-to-polarity converter 13, a voltage-to-frequency converter 14, a memory element in the form of a reversible counter 15. Moreover, the control input of the reversible counter 15 is connected to the output signal of the polarity of the converter 13. The state of the counter is displayed on the indicator 16 and on the setpoint generator 17 of the coating thickness. When the unit reaches a predetermined thickness, a signal is generated to turn off the adjustable source 1 and a signal is received to indicate the end of the coating process. Improving the quality of the coating is achieved by introducing into this device a current density sensor, a differential amplifier, two polarity converters, a recording element, a current-voltage density converter, an additional voltage-frequency converter. 2 hp f-ly. 1 il.

Description

one

(21) 4472302 / 23-02

(22) 20.06.88

(46) 07.03.90. , Byul. Number 9

(71) Brought geophysical equipment

(72) A.L.Hvorostenko and S.A.Stukalov

(53) 621.357.77 (088.8)

(56) USSR Author's Certificate No. 771197, cl. C 25 P 21/12, 1976.

USSR author's certificate W 751844, cl. C 25 D 21/12, 1978.

(54) DEVICE FOR APPLYING GALVANIC COATINGS

(57) The invention relates to electroplating equipment. The purpose of the invention is to improve the quality of the coating. The device contains an adjustable source 1 with current reversal, a metal flow metering circuit 3 consisting of successively connected

current sensor 5, differential amplifier 6, polarity converter 7, voltage-to-frequency converter 8, memory element in the form of a reversible counter 9 and display element in the form of an electric meter 10. The control input and the reversing counter 9 are connected to the output of the polarity signal converter 7. The current density on the bath is measured by a current sensor 11, which directly determines the ion current in the electrolyte solution, the signal from which is fed to the coating thickness control circuit 4, which consists of Connections transducer 12 of the current density in the voltage converter 13, the polarity of the voltage converter 14, voltage-to-frequency, the memory element in the form rever- .sivnogo counter 15. Moreover, the input SS oops

(L

-380BI

39

ate

Ј

00

u vj

SD

pressure of the reversible counter 15 Connected to the output signal of the polarity of the converter 13. The state of the counter is displayed on the indicator 16 and on the sensor 17 of the coating thickness. When the specified thickness is reached by the dial, a signal is generated to turn off the adjustable source 1 and a signal to indicate the end of the gap JQ - frequency. 2 hp f-ly. 1 il.

I

The invention relates to equipment for electroplating and can be used to automatically control the thickness of the coating and record the amount of metal deposited on the parts during the application process.

The purpose of the invention is to increase the quality of coating and the accuracy of ffMfl of metal consumption and coating thickness,

The drawing shows a structural electrical circuit of the device. (The device consists of an adjustable-K current source 1 with a reverse of the galvanic bath 2, a circuit for recording the consumption of precious metals, a circuit for monitoring the thickness of the coating, and a current sensor 5.

The outputs of the regulated current source 1 are connected to a galvanic bath 2, one of which is connected directly to the bath, and the second via the current sensor 5.

1 A current sensor 5 is connected to the precious metals flow detection circuit 3, consisting of a series-connected differential amplifier 6, a voltage polarity converter 7, a voltage voltage-frequency converter 8, a reversible counter 9 and a recording element 10 in the form of an electric pulse counter. Moreover, the second output of the polarity converter 7 is connected to the second input of the reversing sensor 9.

The current density sensor 11, located in the electroplating bath 2, is connected to the coating thickness control circuit k, consisting of a series-connected converter 12, current density-voltage, polarity converter 13, voltage-frequency converter 14, and a reversible counter 15, second output polarity converter 13

Cessa coverage. Improving the quality of the coating is achieved by introducing into this device a current density sensor, a differential amplifier, two polarity converters, a recording element, a current density-voltage converter, an additional voltage converter connected to the second input of the reversible counter 15. One output of the latter is connected to a digital thickness indicator 16 of the coating, and the second output - with the unit 17 of the thickness of the coating; moreover, its one output is connected to the second input of the digital indicator 16, and the second output of the setting unit 17 t The thickness of the coating is with the input of a current density sensor 11 with a reverse.

The device works as follows.

Measurement of precious metals consumption and coating thickness is based on the known dependencies on the electrolysis time, current output, current density and total current in the electrolyzer circuit as determined by the Formulas

Ј,

t Em2JIdr

l

Ј Et 2,

b

(one)

(2)

$ 0

0

where t is the mass of the released metal; H - current output; I is the total current in the electrolyzer circuit;

g is the electrolysis time; JK is the current density; I m- electrochemical equivalent

metal; X is the density of the precipitated metal.

In this device, the dependence (1) is carried out as follows: the electroplating bath is powered from regulated source 1 with current reversal. From the sensor 5 current signal is fed to the input of the differential amplifier 6. The use of a differential amplifier increases the noise immunity of the input circuit of the circuit 3 recording the consumption of precious metals. From the output of the differential amplifier 6, a voltage proportional to the current per van

51

Not, the input voltage of the polarity converter 7, and from its output a positive voltage proportional to the magnitude of the current on the bath, is fed to the input of the voltage converter 8 - frequency.

The frequency at the output of the converter 8 is proportional to the current modulo the bath. The counting input of the reversing counter 9 is connected to the output of the converter 8, and the control input of the counting direction is connected to the second input of the converter 7 of polarity. The output of the reversible counter 9 is connected to the input of the recording element 10.

Relationship (2) is implemented using a current density sensor 11, which measures the ionic current on the surface of the part, the signal from which is fed to the input of the converter 12, the current density - voltage. From the output of the latter, the voltage proportional to the current density goes to the input of the polarity converter 13, and from its output a positive voltage proportional to the magnitude of the current density on the bath modulo arrives to the input of the voltage converter 14 - frequency.

The output frequency of converter 1A is proportional to the current density modulo. The counting input of the reversible counter 15 is connected to the output of the converter 1, and the input controlling the counting direction of the reversible counter 15 is connected to the second output of the polarity converter 13. The counter status is induced by the indicator 16. In addition, information on the state of the counter is supplied to the unit 17 of the coating thickness. When a predetermined thickness is obtained, a CHI is generated at the end of the coating process, that signal goes to the indicator 1b and to the adjustable current source 1 and provides a galvanic bath.

The proposed device, in comparison with the known, allows the use of coating modes with current reversal and improves the accuracy of determining the thickness of the coating and the amount of deposited metal, which leads to metal savings due to the application of coatings with minus tolerances.

Claims (2)

Claim 1. Electroplating device containing 15 20 five Yu 0 five 0 five 0 five a power point connected to the anode and cathode of the bath through a current sensor, a registration circuit for precious metals, made in the form of a voltage-frequency converter and the first counter, a coating thickness control circuit made in the form of a second counter, a thickness gauge, a thickness indicator, current sensor Connected to voltage converter - frequency, the output of which is connected to the input of the first counter, and the output of the second counter is connected to the input of the thickness indicator, the second input is connected to the output of the sensor t In order to improve the quality of the coating by improving the accuracy of determining the metal consumption and the thickness of the coating, it is equipped with a current density sensor, the power source is designed as an adjustable current source with a reverse, the registration circuit for the consumption of precious metals is equipped with a differential amplifier, the first voltage polarity converter and the recording element, and the coating thickness control circuit is equipped with a current density converter - voltage, the second polarity converter and, an additional voltage-frequency converter, the output of the differential amplifier of the precious metals flow detection circuit is connected to the input of the first voltage converter, the output of which is connected to the voltage-frequency converter, the output of which is connected to the counting input of the first counter, control input which is connected to the second output of the first polarity converter, the counter output is connected to the recording element, and the current sensor is connected to the input of the differential amplifier At the same time, the current density sensor is connected to the converter input. The current density is the voltage, the output of which is connected to the input of the second polarity converter, the output of which is connected to the input of the additional voltage converter - frequency, the output of which is connected to the counting input of the second counter; connected to the second output of the second polarity converter; the output of the second counter is connected to 7 15 82758 aaflt JHKOM thickness, the output of which3. The device according to claim 1, about tl and connected-) to the disconnect input of the controlling-tnm that, with the aim of current source. Stabilization of current density by 2. The device according to claim 1, about tl and - ,. input feedback, the output is inconsistent with the fact that the first yoke of the polarity converter connects the second counters are reversible to the control input of the regulated current source.