SU717158A1 - Method of electrolyte composition automatic control and device for its implementation - Google Patents

Description

 No.pHOflWieCKH measures the photon content of sulfuric acid. PeSyTibf GG Measurements; Sixth Sequence Computational Operations: Determine the concentration of sulfuric acid in the electrolyte by means of the MCGS; in elektr; From chromic anhydride of CrOz to the removal of the weight of CrOz to H2SO4 S solution with ryv -CrOj H.jSO. where CCrOj is kbShyy akyykhromevygo an- 7; Hydride - in |} ykgyrtytё, coincides with the measured value of the density of the electrolyte,% CHjSOi - the concentration of sulfuric acid in the electrolyte,%. According to the results of the calculation, the amount of CgO3 is determined, and the NgBOD in the working bath at the time of the survey. No .ii.V4-.S4i2t C ffiilteaioT'1SEMPLETS OF THE SOVIETS Warnings of these reGoits with given, having a memory card of the device, frmmygiruyut ggayaly to replenish the bath with yedbskgayuschimi components. Ofipoc on the electrolyte composition is produced at specified intervals. The level in the bath of the bath is removed by pumping the solution from the trapping bath. FIG. Figure 1 shows the structural® B5SeMa device performing the pre-proposed method; in fig. 2 is a schematic electrical diagram of a unit for determining the concentration of sulfuric acid in the working bath; on phag. 3 test block of a decisive block and its connection with sensors, CrOz AND H2S04 dosage unit: H2.: .L.: .-: l .-, ..,.,., .. „„, ...;.: .. .:. i ... VV :. -. The device contains located in the working bath 1 sensing element 2 3 current density, the sensitive element of the electrode 4 of the sensor 5 of the ALL relationship, b. :: pp- blocking unit 6, block 7, dispensing CrO3, block 8, dosed 1p1 HjSOi, trace port system 9; a level sensor consisting of a sensing element 10 and a relay AND, a power device 12 and a pump. 13.- : .;; ... The electrical circuit (Fig. 2) of the device contains a current regulator 14 pfymoydIT, rectifier 15, shunt 16, ammeter 17, element 18 spins, intermediate) voltage amplifier 19 voltage, unit 20 comparison, intermediate amplifier And and elec Relay 22, KITBYPRO 23, KOTBPORO, are used to break the circuits 24 through the power supply and feed the windings of the electric motor 25 - the controller 14, 4, 4, the decisive unit 6 has a node 26 that compare, setpoint 27, node 28 of the coviaRiRiRiiRa forming part 28 the supply of a correction dose of the CgOz solution, the node compared 29, setting unit 30 and feedback unit 31, unit 32 forming unit 32. For supplying a correction dose HjSO4, timer 33, assembly signaling unit 34, time relay 35 with contacts 36. The device operates as follows. Sensors 3.5 and cell 10 are monitored on the coitrol of the electrolyte composition. Sensor 3 permanently outputs to the decision block 6 a signal corresponding to the density of the electrolyte at the given moment, i.e. the value of the concentration of CrOsV comparison node 28 this signal is combined with the signal from the sensor of the concentration of CrO3. A signal proportional to the difference of the first two signals, at node 28, generates a command to block 7 to issue another dose of the CgOz correction solution. If the dose given is not enough, the device causes the next iffOMaany and so on; until the mismatch decreases to a predetermined acceptable value. From the sensor 5 of the CrO3 / / HI S04 weight ratio, the signal arrives at the comparison node 29, the ACG signal from the setting device 30 and the 3G feedback node. A summed imbalance signal is supplied to the command generation unit 32 to release the correction H2SO4 sulfuric acid solution. Vacation; the dose of this corrective solution can be repeated in the same way as the CgOz solution, until the signal from node 32 and the current CrOz / H2504 ratio in the bath is adjusted to a permissible level, which should be indicated by feedback signal from sulfuric acid dosing unit 8. The activation of the measuring sensor 5 occurs periodically according to the commands of the timer 33 or out of turn by the operator. On the alarm unit 34 of the installation site, a signal is produced. Suspend the measuring electrodes, Std iMySHyK broadcasts the measuring electrode 4 to the auto operator rod, the middle part of which is a collector. The measuring malfunction 4 in the working bath 1 closes the contact of the nDGVIk1uKlater end, which leads to automatic voltage in sensor 5 with the signal Uynp.

In the switch 5, it turned on from the measuring circuit of the sensor 5.

In this case, the contacts 24 of the relay 22 include a reversing motor 25 of the AC regulator. A smoothly increasing alternating voltage (from zero) through rectifiers 15 is supplied to sensitive electrodes 4. Through shunt 16, the signal is fed through two channels simultaneously to delay element 18 and voltage amplifier element 19 and then to the unit of comparisons 20. Or at the output The unit 20 produces a negative signal controlling the intermediate amplifier 21 of the relay 22, which closes until the moment when metallic chrome starts to pick up on the sensitive electrodes 4. At this moment, the value of the current in the circuit transmitted by the amplifier voltage 19 to the input of the comparison unit 20 decreases, while at the same time an increased signal is received from the lag element 18 to another input of the comparison unit: ipr-; neither

As a result of the mismatch, the output signal of unit 20 changes its sign to reverse and the contacts 24 of relay 22 open. The motor 25 changes the direction of rotation until the limit switch operates. The contacts 23 of the relay 22 disconnect the input to the lag element 18 and, at the output of this element, the voltage corresponding to the measured CrO3 / H25O4 ratio is memorized.

From the output of the delay element, the signal enters solver 6, where the concentration of sulfuric acid in the solution is determined by the formula:

The inferred value Hj 504 is compared with a given value and when it is lowered; the content is formed by the command for the appropriate dosing and transportation of the dose Hj S04 to the bath 1. The sensing element 10 of the level sensor is a reed level switch, which operates when lowered. more than 5 mm from the set.

The application of the proposed method and device will improve the quality of the chrome plating, reduce the consumption of chromic anhydride due to replenishment while regulating the electrolyte level. working bath with a solution from the trapping bath and automate the process of chrome plating.

Claims (2)

1. A method of automatically controlling the composition of an electrolyte, for example a two-component, in a working electroplating bath, based on a periodic measurement of the concentration of sulfuric acid and chromic anhydride in the electrolyte and the subsequent addition of metered amounts of both components, in order to increase the electrolyte concentration chromic anhydride is determined by the electrolyte density, and the concentration of sulfuric acid is determined by the current-voltage characteristic, and the level Rolit in the bath keeps it flowing by periodically adding a solution from the trapping bath to the working bath. . 2. An apparatus for carrying out the method according to claim 1, comprising a DC power source with a controller, a current density sensor, an output relay control unit, chromic anhydride and sulfuric acid dosing units, a memory unit, one of them This is because it is additionally equipped with an electrolyte regulator in the bath, a unit for determining the weight ratio of chromic anhydride to sulfuric acid, and a differential unit consisting of delay elements, comparison, and an amplifier for the input signal, and the unit for determining the weight ratio The sensors are connected to the power supply and control unit g, and the differential unit is connected by its inputs to the outputs of the delay element and the input signal and the output through an additional amplifier to the control unit, the contacts of the output relay of which are connected to the memory block and to the control circuit, executive power supply control mechanism. Sources of information taken in the course of the examination 1. German patent N 2041815 Ll. C 25. D 21/12 1971. If Jt  5 / - SB