JP2009249707A - Trivalent chromium-plating liquid management device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trivalent chromium-plating liquid management device capable of supplying a chemical agent at an optional time point not only at a time point when reaching a fixed energizing amount and also using a hardly soluble chemical agent. <P>SOLUTION: The management device is composed of an adjusting tank 1, a chromium hydroxide storage tank 2, a glycine storage tank 3 and an ammonium hydroxide storage tank 4, a chromium hydroxide supply pump 14, a glycine supply pimp 15 and an ammonium hydroxide supply pump 16, and is provided with a control part comprising a logical control part 30, a current addition part 32, a chromium hydroxide supply pump driving part 35, a glycine supply pump driving part 36 and an ammonium supply pimp driving part 37. The required supply energizing amount at the point of time is calculated based on the supply quantity per stored unit energizing amount and the energizing amount measured by the current addition part 32 and when the energizing amount reaches the set value or the operation signal from an operation part 31 is input, each pump are driven to supply the calculated quantity of the chemical agent to be supplied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a trivalent chromium plating solution management apparatus for maintaining and managing the composition of a trivalent chromium plating solution by supplying a plurality of chemicals to the trivalent chromium plating solution.

  Chrome plating is widely used for decoration because it does not corrode in the atmosphere and does not lose its luster, and it is widely used for mechanical parts that require wear resistance because of its high hardness and low coefficient of friction. . Although it is such a useful chromium plating, most of the conventional plating has been performed using a plating solution containing a large amount of harmful hexavalent chromium. Therefore, chromium plating with a plating solution that does not contain harmful hexavalent chromium is strongly desired. For example, a trivalent chromium plating method as disclosed in Patent Document 1 has been proposed.

  In the trivalent chromium plating method disclosed in Patent Document 1, in the case of trivalent chromium plating using a plating solution containing chromium chloride and ammonium chloride, a part of the plating solution is circulated through a cooling device. Plating is performed while controlling the ammonium chloride concentration in the plating solution by crystallizing and removing a part of ammonium chloride. In Example 1, ammonium hydroxide and chromium chloride are added to the plating solution in a constant amount for each constant energization amount. In Example 2, ammonia water, chromium chloride, glycine and boric acid are added for each constant energization amount. It is shown that a fixed amount of each is added to the plating solution.

  As an apparatus for adding a chemical agent to a plating solution for each constant energization amount, for example, a device as shown in Patent Document 2 is known, and it is conceivable to use such a device. An additive replenishing device for electroplating disclosed in Patent Document 2 is a current detector that detects a current flowing through a workpiece, an integrator that integrates the output of the current detector, and outputs a pulse at a certain integral value. It consists of a counter that counts the output pulses of the counter and outputs an output at every fixed count, and a quantitative transfer device that is actuated by the output of the counter and transfers a constant amount of additive.

  However, since what is shown in this Patent Document 2 is to replenish a certain amount of medicine for every predetermined energization amount set in advance, it is not possible to replenish a necessary amount of medicine at an arbitrary time point. It was. Therefore, when plating the next workpiece after plating one workpiece, the components that have been reduced up to that point cannot be replenished at that time, and some components remain reduced while the next workpiece is plated. There was a problem that the plating of the plated product was started. There is also a problem that a plurality of drugs cannot be replenished.

  By the way, the inventor of the present application uses a trivalent chromium plating solution containing chromium chloride, ammonium chloride, glycine, aluminum chloride and boric acid disclosed in Patent Document 1, or a trivalent chromium plating solution obtained by removing aluminum chloride therefrom. Experiments were repeated on chromium plating. As a result, instead of ammonium hydroxide and chromium chloride, or aqueous ammonia, chromium chloride, glycine and boric acid, which are shown as chemicals to be replenished in Patent Document 1, chromium hydroxide, glycine and ammonium hydroxide are used in a certain amount of current. It was found that good trivalent chromium plating can be continued by replenishing every time. Further, the preferred pH value of the plating solution varies depending on the concentration of chromium chloride, and is 0.1 to 0.3 when the chromium chloride concentration is 300 g / l, and 0.4 to 0.8 when 150 g / l. We have knowledge.

Although such a combination of replenishing chemicals gives very good results, when replenishing these chemicals, chromium hydroxide is difficult to dissolve, and is supplied to the plating tank simultaneously with ammonium hydroxide, which is particularly alkaline. Then, since it did not melt | dissolve, there existed a problem of causing plating defects, such as a rough surface.
JP 2002-322599 A Japanese Utility Model Publication No. 46-009223

  The present invention solves the above-described problems, and supplies a drug in an amount commensurate with a decrease in components due to current energization at any time when an operation signal is input when a certain energization amount is reached. The present invention has been made in order to provide a trivalent chromium plating solution management apparatus that can use a drug that is difficult to dissolve in the supplied drug.

  The trivalent chromium plating solution management device of the present invention made to solve the above problems includes an adjustment tank, a storage tank that stores a plurality of drugs, and a plurality of drugs that individually send the drugs from each storage tank to the adjustment tank. A trivalent chromium plating solution management device configured to supply a component that decreases in proportion to the energization amount by supplying each chemical to the plating solution taken out from the plating tank to the adjustment tank. Measured from the current integration means for measuring the amount of energization by integrating the current flowing through the plated object, the storage means for storing the supply amount of each medicine required per unit energization amount, and the measured energization amount and the contents of the storage means Calculating means for calculating the supply amount of each medicine necessary for the energized amount, comparing means for outputting a signal when the energized amount reaches a set value, and outputting a signal when an operation signal is inputted Input means and comparator Alternatively, there is provided a control device including a plurality of supply pump driving means for driving each supply pump to supply a supply amount of medicine calculated by the calculation means when the output of the input means is given. Is.

  Here, the chemical is chromium hydroxide, glycine and ammonium hydroxide, the chromium hydroxide supply pump drive means is operated, and the glycine supply pump is reached when the set waiting time has elapsed after the operation of the chromium hydroxide supply pump drive means has elapsed. It is preferable to add sequence control means for operating the driving means and operating the ammonium hydroxide supply pump driving means when the set waiting time has elapsed after the operation of the glycine supply pump driving means is completed.

  According to the present invention, the necessary supply amount of each medicine is calculated with respect to the measured energization amount from the measured energization amount and the necessary supply amount of each medicine per unit energization amount stored in advance. Since the calculated amount of medicine is supplied when the energization amount reaches the set value or when the operation signal is input, the component can be replenished at an arbitrary time. . Thereby, if it replenishes when plating a new to-be-plated thing, there exists an effect which can always start plating on the conditions similar to a new liquid. In addition, when the chemical is supplied with chromium hydroxide, glycine and ammonium hydroxide in the order of chromium hydroxide, glycine and ammonium hydroxide, it is difficult to dissolve chromium hydroxide. There is an advantage that the chromium hydroxide is completely dissolved since no ammonium hydroxide which prevents dissolution of the dissolution of other agents, especially chromium hydroxide, is supplied until it is finished.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a trivalent chromium plating solution management apparatus according to the present invention, in which an adjustment tank 1, a chromium hydroxide storage tank 2, a glycine storage tank 3, an ammonium hydroxide storage tank 4, a hydrochloric acid storage tank 5 and This is composed of a pure water storage tank 6. On the adjustment tank 1, a pH measurement tank 8 provided with a pH measurement electrode 7 is provided, and piping is provided so that the plating solution in the adjustment tank 1 is circulated through the pH measurement tank 8 by a pH measurement pump 9.

  The adjustment tank 1 is provided with a stirrer 10, and a temperature sensor 11 and a heater 12 are provided to adjust the temperature. The chromium hydroxide storage tank 2 is provided with a stirrer 13, and is provided with a chromium hydroxide supply pump 14 so as to supply chromium hydroxide in the chromium hydroxide storage tank 2 to the adjustment tank 1. The stirrer 10 can be of a rotary blade type, but the stirrer 13 is preferably a magnet stirrer that drives a stirrer from outside the tank by magnetism.

  15, 16, 17 and 18 are a glycine supply pump, an ammonium hydroxide supply pump, a hydrochloric acid supply pump and a pure water supply pump, respectively. The glycine storage tank 3, ammonium hydroxide storage tank 4, hydrochloric acid storage tank 5 and Pipes are provided so that glycine, ammonium hydroxide, hydrochloric acid and pure water are supplied from the pure water storage tank 6 to the adjustment tank 1. Chromium hydroxide, glycine and ammonium hydroxide are chemicals supplied to supplement the components consumed in proportion to the amount of electricity applied by electrodeposition or decomposition, and it is necessary to precisely control the supply amount. The supply pump 14, the glycine supply pump 15, and the ammonium hydroxide supply pump 16 serve as a metering pump having a constant liquid feeding amount per fixed time.

  In FIG. 1, the left side of the chain line is a plating tank in which plating is performed with a plating solution to be managed, and a circulation pump 21 that sends the plating solution from the adjustment tank 1 through the filter 19 to the plating tank 20 is provided. Between the plating tank 20 and the adjustment tank 1, a pipe for flowing the plating solution from the overflow 22 of the plating tank 20 to the adjustment tank 1 is provided. In addition to the temperature sensor 23 and the heater 24, the plating tank 20 is provided with equipment, devices, and the like similar to those of a normal plating tank, such as an anode, a stirrer, and a hanger receiver (not shown). In the figure, 25 and 26 are valves provided before and after the circulation pump 21, and 27 is a pressure gauge provided on the inlet side of the filter 19, which is used for maintenance. Reference numeral 28 denotes a liquid level sensor provided in the adjustment tank 1.

  FIG. 2 shows a control device for controlling the agitators 10 and 13 such as a pH measuring pump 9, a chromium hydroxide supply pump 14, a glycine supply pump 15, an ammonium hydroxide supply pump 16, a hydrochloric acid supply pump 17, and a pure water supply pump 18. It is a block diagram which shows the structure of these. The control device includes a logic control unit 30, an operation unit 31, a current integration unit 32, a pH measurement unit 33, a pH measurement pump drive unit 34, a chromium hydroxide supply pump drive unit 35, a glycine supply pump drive unit 36, and an ammonium hydroxide supply. The pump drive unit 37, the hydrochloric acid supply pump drive unit 38, the pure water supply pump drive unit 39, the circulation pump drive unit 40, and the stirrer drive units 41 and 42 are configured. Here, the stirrer driving units 41 and 42 drive the stirrers 10 and 13, respectively.

  The operation unit 31 has a function of a push button switch and a display, and can be configured by a so-called touch panel. The input unit 31 sends signals such as various parameters and driving operations to the logic control unit 30 and sends them from the logic control unit 30. Information such as input response, operation status, and the like are displayed. An instantaneous value of the current flowing through the object to be plated, which is detected by a shunt or the like, is input to the current integrating unit 32, and an energization amount obtained by integrating the current value is sent to the logic control unit 30. A signal of the pH measurement electrode 7 is input to the pH measurement unit, and the measured pH value is sent to the logic control unit 30.

  pH measurement pump drive unit 34, chromium hydroxide supply pump drive unit 35, glycine supply pump drive unit 36, ammonium hydroxide supply pump drive unit 37, hydrochloric acid supply pump drive unit 38, pure water supply pump drive unit 39, circulation pump drive A signal is sent from the logic control unit 30 to the unit 40 and the stirrer driving units 41 and 42. When a signal from the logic control unit 30 is given, power is supplied to each pump and stirrer to drive them. Although not shown, if the temperature sensor 11 and the heater 12 are connected to the logic control unit 30 through an interface, the heater 12 is turned on and off by the logic control unit 30 to control the temperature of the adjustment tank 1. Can do.

  The operation of the trivalent chromium plating solution management apparatus configured as described above will be described below. First, various parameters are input from the operation unit 31 prior to driving. The parameters that need to be input are the energization amount, supply amounts of chromium hydroxide, glycine and ammonium hydroxide, hydrochloric acid replenishment start pH value, ammonium hydroxide replenishment start pH value, pH adjustment determination time, waiting time 1 to 5 , The amount of liquid feed per unit time of the liquid feed pumps of the chromium hydroxide supply pump 14, the glycine supply pump 15, and the ammonium hydroxide supply pump 16. The energization amount input here is a value that each drug is supplied every time the energization amount is reached, and the supply amount of chromium hydroxide, glycine, and ammonium hydroxide is the supply amount of each drug to be supplied per unit energization amount. It is.

  Waiting time 1 is the time from the start of operation of the agitators 10 and 13 to the start of operation of the chromium hydroxide supply pump 14, waiting time 2 is the time from the stop of the chromium hydroxide supply pump 14 to the start of operation of the glycine supply pump 15, and waiting time 3 is glycine The time until the operation of the ammonium hydroxide supply pump 16 starts after the supply pump 15 stops, the waiting time 4 is the time from the stop of the ammonium hydroxide supply pump 16 until the operation of the circulation pump 21 starts, and the waiting time 5 after the operation of the circulation pump 21 starts This is the time until the operation of the ammonium hydroxide supply pump 16 or the hydrochloric acid supply pump 17 starts. The pH of the plating solution is preferably 0.1 to 0.3 if the chromium chloride concentration is 300 g / l, and 0.4 to 0.8 if the chromium chloride concentration is 150 g / l. The value is set to 0.3 to 0.8, and the ammonium hydroxide replenishment start pH value is set to 0.1 to 0.4.

  When various parameters are input in this way, the logic control unit 30 inputs the input amount of chromium hydroxide, glycine and ammonium hydroxide per unit energization amount, and the input chromium hydroxide supply pump 14 and glycine supply pump 15. And the amount of chromium hydroxide, glycine, and ammonium hydroxide corresponding to the supplied amount per unit energization amount from the amount of liquid fed per unit time of the ammonium hydroxide supply pump 16 The operation times of the chromium hydroxide supply pump 14, the glycine supply pump 15 and the ammonium hydroxide supply pump 16 are calculated and stored.

  When plating is started and the trivalent chromium plating solution management apparatus is operated, a signal is sent from the logic control unit 30 to the circulation pump drive unit 40 and the agitator drive unit 41, and the circulation pump 21 and the agitator 10 are operated. Thereby, the plating solution in the adjustment tank 1 is sent to the plating tank 20 by the circulation pump 21 through the filter 19, and the plating solution in the plating tank 20 flows from the overflow 22 to the adjustment tank 1 and between the adjustment tank 1 and the plating tank 20. Thus, the plating solution circulates, and the plating solution in the plating tank 20 and the plating solution in the adjustment tank 1 are kept in a uniform state. Further, the plating solution in the adjustment tank 1 is stirred by the stirrer 10.

  The current flowing in the plating object (not shown) in the plating tank 20 is integrated by the current integration unit 32, and the energization amount is sent to the logic control unit 30. When the energization amount reaches the input energization amount, no signal is sent from the logic control unit 30 to the circulation pump drive unit 40, and no signal is sent to the agitator drive units 41, 42. Therefore, the circulation pump 21 stops and the agitator 10 and 13 are operated. Thereby, the circulation of the plating solution between the adjustment tank 1 and the plating tank 20 is stopped, and the chromium hydroxide in the chromium hydroxide storage tank 2 is stirred.

  When the waiting time 1 after the start of the operation of the stirrer 13 has elapsed, a signal is sent from the logic control unit 30 to the chromium hydroxide supply pump drive unit 35, and the chromium hydroxide supply pump 14 is operated for a predetermined time. Thereby, the chromium hydroxide in the chromium hydroxide storage tank 2 is sent to the adjustment tank 1. The waiting time 1 is a time during which the chromium hydroxide in the chromium hydroxide storage tank 2 becomes uniform. The operation time of the chromium hydroxide supply pump 14 is calculated by the logic control unit 30, and the operation time of the chromium hydroxide supply pump 14 required to send the stored supply amount per unit energization amount of chromium hydroxide is Since it is calculated from the energization amount, an amount of chromium hydroxide commensurate with the energization amount is sent. Since the plating solution in the adjustment tank 1 is strongly acidic and is stirred by the stirrer 10, the chromium hydroxide sent by the chromium hydroxide supply pump 14 is dissolved in the plating solution.

  When the waiting time 2 after the operation of the chromium hydroxide supply pump 14 has elapsed, a signal is sent from the logic control unit 30 to the glycine supply pump drive unit 36, and the glycine supply pump 15 is operated for a certain period of time. Thereby, the glycine in the glycine storage tank 3 is sent to the adjustment tank 1. The waiting time 2 is the time for the chromium hydroxide sent to the adjustment tank 1 to dissolve in the plating solution. The time for which the glycine supply pump 15 is operated is calculated by the logic control unit 30 and is calculated from the operation time of the glycine supply pump 15 necessary for sending the stored supply amount per unit energization amount of glycine and the energization amount. Therefore, an amount of glycine corresponding to the energization amount is sent. The plating solution in the adjustment tank 1 is stirred by the stirrer 10, and the glycine fed by the glycine supply pump 15 is mixed with the plating solution.

  When the waiting time 3 after the operation of the glycine supply pump 15 ends, a signal is sent from the logic control unit 30 to the ammonium hydroxide supply pump drive unit 37, and the ammonium hydroxide supply pump 16 is operated for a predetermined time. Thereby, the ammonium hydroxide in the ammonium hydroxide storage tank 4 is sent to the adjustment tank 1. The waiting time 3 is a time during which glycine sent to the adjustment tank 1 is mixed with the plating solution. The time for which the ammonium hydroxide supply pump 16 is operated is calculated by the logic control unit 30, and the operation time of the ammonium hydroxide supply pump 16 necessary for sending the stored supply amount per unit current of ammonium hydroxide, Since it is calculated from the energization amount, an amount of ammonium hydroxide commensurate with the energization amount is sent. The plating solution in the adjustment tank 1 is stirred by the stirrer 10, and the ammonium hydroxide sent by the ammonium hydroxide supply pump 16 is mixed with the plating solution.

  When the waiting time 4 after the operation of the ammonium hydroxide supply pump 16 has elapsed, a signal is sent from the logic control unit 30 to the pH measurement pump drive unit 34 and the circulation pump drive unit 40, and the pH measurement pump 9 and the circulation pump 21 are operated. Is done. As a result, the plating solution in the adjustment tank 1 in which the decrease in the components due to energization is supplied by the supply of chromium hydroxide, glycine and ammonium hydroxide is sent to the plating tank 20 by the circulation pump 21, and the plating tank in which the components are reduced. Since the plating solution in 20 flows from the overflow 22 to the adjustment tank 1, the plating solution in the plating tank 20 and the plating solution in the adjustment tank 1 become uniform, and the components for reduction are supplied to the plating solution in the plating tank 20. Will be. The waiting time 4 is a time during which ammonium hydroxide is mixed with the plating solution.

  When the waiting time 5 input after the operation of the pH measuring pump 9 and the circulation pump 21 has elapsed, the pH value sent from the pH measuring unit 33 by the logic control unit 30, the hydrochloric acid replenishment start pH value, and the ammonium hydroxide replenishment start pH value. If the pH value is higher than the hydrochloric acid replenishment start pH value, the hydrochloric acid supply pump drive unit 38, and if the pH value is lower than the ammonium hydroxide replenishment start pH value, the logic control unit is connected to the ammonium hydroxide supply pump drive unit 37, respectively. A signal is sent from 30. Thereby, the hydrochloric acid supply pump 17 or the ammonium hydroxide supply pump 16 is operated. The waiting time 5 is a time until the plating solution in the plating tank 20 and the plating solution in the adjustment tank 1 become uniform and the pH measurement electrode 7 and the pH measurement unit 33 are stabilized.

  The logic controller 30 continued to compare the pH value with the hydrochloric acid replenishment start pH value and the ammonium hydroxide replenishment start pH value, and after the hydrochloric acid supply pump 17 was operated, the pH value became lower than the hydrochloric acid replenishment start pH value. Or after the ammonium hydroxide supply pump 16 is operated, if the state continues for a time exceeding the pH adjustment determination time after the pH value becomes higher than the ammonium hydroxide replenishment start pH value, the logic controller 30 sends hydrochloric acid. No signal is sent to the supply pump drive unit 38 or the ammonium hydroxide supply pump drive unit 37, the hydrochloric acid supply pump 17 or the ammonium hydroxide supply pump 16 stops, and the supply of hydrochloric acid or ammonium hydroxide stops.

  If the pH value is lower than the hydrochloric acid replenishment start pH value when the waiting time 5 has elapsed and is higher than the ammonium hydroxide replenishment start pH value, the pH value is within a predetermined range. No signal is sent to any of the ammonium supply pump drive units 37, and neither the hydrochloric acid supply pump 17 nor the ammonium hydroxide supply pump 16 is operated. Thus, if the pH value of the plating solution is within a predetermined range, hydrochloric acid or ammonium hydroxide is supplied as it is outside the predetermined range, and the pH value is adjusted to a predetermined range according to the concentration of chromium chloride. . Further, when the amount of the plating solution decreases, a signal is sent from the logic control unit 30 to the pure water supply pump drive unit 39, the pure water supply pump 18 is operated, and pure water is sent to the adjustment tank 1, The amount of plating solution is maintained.

  In this way, chromium hydroxide, glycine and ammonium hydroxide are supplied so as to supplement the consumed components every time the energization amount of the current flowing through the workpiece reaches the input energization amount, and the pH is set within a predetermined range. Hydrochloric acid or ammonium hydroxide is supplied so that the amount of the plating solution is maintained, and pure water is supplied so as to maintain the amount of the plating solution. The logic control unit 30 sends a signal to the chromium hydroxide supply pump drive unit 35 and the like so as to perform the respective supply operations in the same order as described above, and the chromium hydroxide supply pump 14 and the like are sequentially operated.

  The operation time of the chromium hydroxide supply pump 14 at this time is calculated by the logic control unit 30, and the operation of the chromium hydroxide supply pump 14 necessary for sending the stored supply amount per unit energization amount of chromium hydroxide is performed. Since it is calculated from the time and the amount of energization from when it was last replenished to when the replenishment command was entered, it is necessary to replenish the components consumed between the last replenishment and when the replenishment command was entered A large amount of chromium hydroxide is supplied. Since the operation time of the glycine supply pump 15 and the ammonium hydroxide supply pump 16 is calculated in the same manner, the amount of glycine and ammonium hydroxide necessary to replenish the components consumed during the operation is supplied. Become.

  As is apparent from the above description, in the trivalent chromium plating solution management device of the present invention, any time when the energization amount reaches a set constant value or when an operation signal is input, The amount of chemicals required to replenish the components reduced by energization is supplied, so if an operation signal is input when starting plating of a new plating object, plating is performed with a plating solution that does not have insufficient components. There are advantages that can be made. Since chromium hydroxide, glycine and ammonium hydroxide to be replenished are dissolved and mixed in the plating solution in an adjusting tank provided separately from the plating tank in order, there is an advantage that chromium hydroxide which is difficult to dissolve is completely dissolved. Further, since all the chemicals are supplied to the plating tank, the object to be plated is not plated with an incomplete plating solution in which only a part of the components is replenished.

  The plating solution contains boric acid or boric acid and aluminum chloride, but boric acid and aluminum chloride are not reduced by electrodeposition or decomposition, but are reduced only by pumping. Therefore, the amount of the component that is reduced by the pumping can be maintained by a method such as predicting the pumping amount in advance and supplying the medicine at regular intervals.

It is a figure which shows the structure of the trivalent chromium plating solution management apparatus of this invention. It is a block diagram which shows the structure of a control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adjustment tank 2 Chromium hydroxide storage tank 3 Glycine storage tank 4 Ammonium hydroxide storage tank 5 Hydrochloric acid storage tank 6 Pure water storage tank 7 pH measurement electrode 8 pH measurement tank 9 pH measurement pump 10 Stirrer 11 Temperature sensor 12 Heater 13 Stirrer 14 Chromium hydroxide supply pump 15 Glycine supply pump 16 Ammonium hydroxide supply pump 17 Hydrochloric acid supply pump 18 Pure water supply pump 19 Filter 20 Plating tank 21 Circulation pump 22 Overflow 23 Temperature sensor 24 Heater 25, 26 Valve 27 Pressure gauge 28 Liquid level sensor DESCRIPTION OF SYMBOLS 30 Logic control part 31 Operation part 32 Current integration part 33 pH measurement part 34 pH measurement pump drive part 35 Chromium hydroxide supply pump drive part 36 Glycine supply pump drive part 37 Ammonium hydroxide supply pump drive part 38 Hydrochloric acid supply pump drive unit 39 Pure water supply pump drive unit 40 Circulation pump drive unit 41, 42 Stirrer drive unit

Claims (2)

  Consists of an adjustment tank, a storage tank that stores multiple chemicals, and a plurality of supply pumps that individually send the chemicals from each storage tank to the adjustment tank, and supplies each chemical to the plating solution taken out from the plating tank to the adjustment tank A trivalent chromium plating solution management device that replenishes a component that decreases in proportion to the energization amount, integrating current flowing through the object to be plated and measuring the energization amount, and a unit energization amount Storage means for storing the required supply amount of each medicine, calculation means for calculating the required supply amount of each medicine from the measured energization amount and the content of the storage means, and energization Comparing means for outputting a signal when the amount reaches a set value, input means for outputting a signal when an operation signal is input, and each supply pump is driven when the output of the comparing means or the input means is given. To the calculation means Trivalent chromium plating solution control apparatus, wherein a control device is provided comprising a plurality of supply-pump driving means for supplying respectively calculated supply amount of drug Ri.   The drug is chromium hydroxide, glycine and ammonium hydroxide, the chromium hydroxide supply pump drive means is operated, and the glycine supply pump drive means is turned on when the set waiting time has elapsed after the operation of the chromium hydroxide supply pump drive means has elapsed. The sequence control means for operating the ammonium hydroxide supply pump drive means when the waiting time set after the operation of the glycine supply pump drive means is completed has been added to the control device. Trivalent chromium plating solution management device.

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