KR101925748B1 - An Electrolyte current analysis And Automatic Sulfuric Acid Supply System for Metal Anodizing Treatment Apparatus - Google Patents

Abstract

The present invention relates to an electrolyte current analysis and automatic sulfuric acid supply system for a metal anodizing treatment apparatus. An object of the present invention is to monitor the current value of an electrolyte in a metal anodizing treatment apparatus so that the concentration of the sulfuric acid (H2_SO_4) of the electrolyte can be constantly maintained and the amount of sulfuric acid input can be automatically adjusted. Moreover, the present invention lowers a defective rate by means of control for maintaining the temperature value of the electrolyte at a set temperature value. The present invention includes a current measurement means and a temperature measurement means installed in an electrolytic bath, a controller outputting a control signal in accordance with measurement values thereof, a sulfuric acid input pump adjusting the amount of sulfuric acid input of a sulfuric acid storage tank at the control signal of the controller, and a temperature adjustment means for electrolyte temperature adjustment.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electrolytic current analysis apparatus and an automatic sulfuric acid supply system for an anodizing apparatus,

The present invention relates to an electrolyte current analysis and sulfuric automatic supply system of the anodizing apparatus of a metal, more specifically constant the concentration of sulfuric acid (黃酸, sulfuric acid, H2 _S O ₄₎ of the electrolytic solution in the anodizing apparatus of a metal The present invention also relates to an electrolytic current analysis and an automatic sulfuric acid supply system of an anodizing apparatus for a metal which controls the current value of the electrolytic solution so as to maintain the temperature value of the electrolytic solution while maintaining the sulfuric acid input amount while maintaining the set temperature value.

In general, anodizing is an oxide film (aluminum oxide: Al ₂ O (Al ₂ O _3)), which has a strong adhesion to the base metal due to oxygen generated from the anode when a metal or a component is placed on the anode and is electrolyzed in a dilute- ₃ are formed. Anodic oxidation is an anodizing of anode and oxidation. In addition, there is a difference from electroplating in which metal parts are plated on a negative electrode. The most typical material of the anodic oxidation is aluminum (Al), and anodizing is also performed on metallic materials such as magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), and niobium Processing. In recent years, the anodizing treatment of magnesium and titanium materials is also increasingly used.

Anodizing on Aluminum Alloys, which treats the surface of aluminum materials on an anodic surface, is half-eroded and half of the aluminum surface is formed by electrolysis of aluminum on the anode. Aluminum anodizing (anodic oxidation) can form films with different properties depending on the composition and concentration of various electrolytic (processing) liquids, additives, electrolyte temperature, voltage, current and so on.

As the characteristics of the anodic oxide film, the film is a dense oxide, which is excellent in corrosion resistance, improves the ornamental appearance, and has a considerably hardened anode coating to improve abrasion resistance, improve coating adhesion, improve bonding performance, It enhances lubricity, exhibits a unique color for decorative purpose, enables plating pretreatment, and can detect surface damage.

In particular, hard anodizing is characterized by a low temperature (or room temperature) electrolysis of aluminum alloy, which is a low-temperature electrolysis method for H ₂ SO ₄ solution, which is generally a solid film having corrosion resistance, abrasion resistance, If it is at least 30 탆 or more, it can be said to be hard. Aluminum metal surface is changed into alumina ceramic by using electric and chemical method. When this method is applied, the aluminum metal itself is oxidized and changed into alumina ceramics. The properties of the aluminum surface are stronger than steel and abrasion resistance is better than hard chrome plating. It does not peel off like plating or paint (coating). The changed alumina ceramic surface is excellent in electrical insulation (1,500V), but electricity flows well inside. Advanced techniques using hard-anodizing surface treatment techniques have been developed and applied to such aluminum metal.

In order to treat hard anodizing of aluminum metal, aluminum metal is immersed in an electrolytic bath containing an electrolytic solution of an acidic solution, and a voltage and a current of a certain magnitude are flowed to form an oxide film on the surface of the metal. The thickness of the oxide film varies. Therefore, a certain amount of sulfuric acid should be added to the electrolytic solution.

Conventional plating is a process of coating a surface of a metal with a certain thickness of coating, so that the operator can perform desired plating using a simple skill or predetermined data. , Dozens of alloys are precipitated by the precipitation oxidation method of the metal surface. At this time, silicon, iron or copper, which interferes with the anodizing surface treatment of the metal, is dissolved together. Accordingly, at the anodizing surface treatment of the metal, a certain concentration of sulfuric acid is injected into the electrolytic solution to remove foreign matters remaining in the electrolytic solution or dissolved aluminum, and the thickness and color of the coating can be uniformly treated according to the concentration of sulfuric acid. Typically, sulfuric acid should have approximately 200 grams dissolved in one liter of electrolyte. However, since the concentration of sulfuric acid in the anodizing surface treatment of the metal is reduced, a certain amount of sulfuric acid should be supplied to the electrolytic solution. This means that the voltage and current values of a certain size must be maintained in the electrolyte, and the sulfuric acid is added thereto.

Therefore, the hard anodizing surface treatment of aluminum metal enables the operator to realize the thickness and color of the oxide film due to the long skill. Experienced workers also had to pay a certain percentage of defects. Therefore, the anodizing surface treatment by the less skilled or novice worker with an oxide film of the metal has led to the disadvantage of increasing the defect rate and the inefficient productivity.

In order to uniformly anodize the surface of the metal, the voltage and the current value of the electrolyte must be constant. Therefore, the concentration of the sulfuric acid dissolved in the electrolyte must be constant. Therefore, it is troublesome to measure the concentration of sulfuric acid dissolved in the electrolytic solution and to put a certain amount of sulfuric acid into the electrolytic bath, and it is more difficult to input the exact amount of sulfuric acid. As a result, the time required to increase the thickness of the metal film is increased, and the manpower and cost for the anodizing surface treatment of the aluminum metal are increased.

The present applicant has proposed Registration No. 10-1048041. The present invention relates to an apparatus for anodizing a metal in which an object to be plated is immersed in an electrolytic bath in which an electrolytic solution is stored and an electric power is applied to the electrolytic solution to anodize the object to be plated, A sensing device which is immersed and senses the voltage and current value of the electrolyte; A controller for controlling power supplied to the sensing device, for comparing a voltage and a current value inputted from the sensing device with preset reference voltages and current values, and outputting a control signal; And a solenoid valve provided under the storage tank storing the sulfuric acid and opening / closing the storage tank with the control signal of the controller to input and shut off the sulfuric acid into the electrolytic bath through the piping. The electrolytic solution stored in the electrolytic bath has a constant voltage and current value It is possible to improve the quality of the anodized metal-treated product, the productivity, the convenience of the work, and the working efficiency of the metal anodizing apparatus.

However, according to this configuration, when the temperature of the electrolytic solution in the electrolytic bath can not maintain the proper temperature range, there is a problem that the defective rate increases during coating and sealing processes.

In particular, since the temperature of the aqueous solution must be continuously monitored, there is still a great deal of difficulty in managing the aqueous solution.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an anodizing apparatus for a metal, which is capable of maintaining a constant concentration of sulfuric acid (H ₂ SO ₄ ) The present invention also provides an apparatus for automatically analyzing an electrolyte solution and an automatic sulfuric acid supply system of an anodizing apparatus for a metal that can control the sulfuric acid input amount automatically while controlling the temperature value of the electrolytic solution to maintain the set temperature value.

In order to solve such a technical problem,

A current measuring means for measuring a current value of the electrolyte stored in the electrolytic bath and forming a coating on the object to be plated; A temperature measuring means for measuring a temperature of the electrolytic solution; Comparing the current measurement value input from the current measurement unit with a preset reference current value to output a first control signal, comparing the temperature measurement value input from the temperature measurement unit with a preset reference temperature value A controller for analyzing and outputting a second control signal; A sulfuric acid input pump for inputting sulfuric acid in the sulfuric acid storage tank into the electrolytic bath in accordance with the first control signal of the controller; And a temperature control means for controlling the temperature of the electrolytic solution in the electrolytic bath in accordance with a second control signal of the controller. The present invention also provides an electrolytic solution current analysis and an automatic sulfuric acid supply system of the apparatus for anodizing metals.

In this case, the current measuring means is a platinum sensor for measuring the current of the electrolytic solution, and the temperature measuring means is PT100.

And, when a rectifier controlled through the controller is driven, a power source for the thin film is applied to the anode busbar and the cathode terminal through the electric wire; The controller controls the pump for injecting sulfuric acid by outputting the first control signal by comparing the current measurement value input through the current measurement unit with the reference current value stored in the memory unit, Wherein the controller controls the temperature of the electrolyte by driving the temperature control means when the temperature measurement value of the electrolyte measured by the temperature measurement means deviates from the reference temperature value.

Further, when the controller exceeds the upper limit value of 22.5 ° C, which is set in the soft anodizing process, the temperature control means drives the freezer.

The controller controls a pump for injecting a surfactant for controlling an amount of a surfactant supplied to the surfactant reservoir.

Further, the controller is configured as a PLC; The controller sets the reference current value and the reference temperature value of the electrolytic solution by the setting and display means; The setting and display means is a touch screen for displaying a reference current value and a reference temperature value of the electrolytic solution, and a current measurement value and a temperature measurement value measured by the current measurement means and the temperature measurement means.

The analysis of the electrolytic solution current and the sulfuric acid automatic supply system of the apparatus for anodizing metals according to the present invention can be carried out by supplying a certain amount of sulfuric acid so that a constant current value is maintained in the electrolytic solution stored in the electrolytic bath, It is possible to significantly reduce the defective rate of the product which may occur during the anodizing plating process and to facilitate the anodizing treatment work for the unskilled worker, thereby improving the work efficiency.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an overall configuration diagram for an electrolyte current analysis and an automatic supply control of sulfuric acid in an apparatus for anodizing metals according to the present invention; FIG.
2 is a cross-sectional view of an electrolytic cell for an electrolytic current analysis and an automatic supply control of sulfuric acid in an apparatus for anodizing metals according to the present invention.
FIG. 3 is a schematic diagram of the control of the electrolytic solution current analysis and the sulfuric acid automatic supply system of the apparatus for anodizing metals according to the present invention.

Hereinafter, an electrolyte current analysis and an automatic sulfuric acid supply system of an apparatus for anodizing metals according to the present invention will be described in detail with reference to the accompanying drawings.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

1 to 3, the present invention relates to an anodizing apparatus for a metal, which is stored in an electrolytic bath 1 to monitor the electric conductivity of an electrolytic solution W used for anodizing surface treatment of a metal in real time to maintain a constant current value The amount of sulfuric acid is automatically supplied to the electrolytic cell 1 so that the temperature of the electrolytic solution W is maintained within a predetermined range to reduce the defective rate. In the electrolytic bath 1 of the metal anodizing apparatus, The anodizing treatment of the object P to be plated proceeds in a state where a certain amount of the electrolytic solution W is stored. As a result, the plating object (P) has a prescribed quality of high quality and the plating strength can be increased, and high quality products can be continuously produced.

The electrolytic solution current analysis and sulfuric acid automatic supply system of the apparatus for anodizing metals according to the present invention as described above is characterized in that the electrolytic solution current and the sulfuric acid supply system for measuring the current value of the electrolytic solution W which is stored in the electrolytic bath 1 and forms a coating film on the object P Measuring means (10); A temperature measuring means (20) for measuring the temperature of the electrolytic solution (W); The current measurement value inputted from the current measurement means 10 is compared with a preset reference current value to output a first control signal and the temperature measurement value inputted from the temperature measurement means 20 is set in advance A controller (30) for comparing and analyzing the reference temperature value and outputting a second control signal; A sulfuric acid input pump 41 for inputting sulfuric acid in the sulfuric acid storage tank 40 into the electrolytic bath 1 according to a first control signal of the controller 30; And temperature adjusting means 50 for adjusting the temperature of the electrolytic solution W in the electrolytic bath 1 according to a second control signal of the controller 30.

At this time, the object P to be plated is immersed in the electrolytic bath 1 and the controller 30 applies electric power of a predetermined magnitude to the electrolytic solution W to cause the object P to be anodized, A rectifier 60 for applying an electric power for forming an oxide film to form a film on the object P is driven.

Hereinafter, the constitution of each part of the present invention will be described in detail.

The electrolytic bath 1 stores a predetermined amount of the electrolytic solution W so that a predetermined amount of the electrolytic solution W is stored and forms a film on the object P to be coated. When a power source for the anodic coating is supplied through the rectifier 60, A coating film is formed on the surface of the substrate P.

The power supply for the oxidation coating of the rectifier 60 may be supplied with various DC voltages such as 20V, 25V and 40V within the range of 10 to 50V. Through the application of various power sources for the oxide film, it is possible to form an oxide film of various thicknesses on the surface of the object to be plated.

The anode power of the rectifier 60 is supplied to the anode bus bar 2 and the cathode power is supplied to the electrolytic solution W through the anode terminal 3 to treat the plating of the object P to be plated.

The electrolyzer 1 is provided with a current measuring means 10 for measuring the current value of the electrolytic solution W and a temperature measuring means 20 for measuring the temperature of the electrolytic solution W. The controller 30 for monitoring the current measurement value of the electrolytic solution and the temperature measurement value of the electrolytic solution drives or stops the sulfuric acid input pump 41 to adjust the amount of sulfuric acid supplied to the sulfuric acid storage tank 40, , The temperature control means (50) is controlled to adjust the temperature of the electrolytic solution (W) in the electrolyzer (1).

At this time, the controller 30 controls the amount of the sulfuric acid to be supplied to the sulfuric acid storage tank 40 through the driving control of the sulfuric acid-containing pump 41, A reservoir 42 is provided so that the amount of the charged substance can be adjusted by the pump 43 for injecting a surfactant. That is, the controller 30 can control the amount of the surfactant contained in the surfactant reservoir 42 through the control of the pump 43 for injecting the surfactant.

In this case, the controller 30 controls the driving or stopping control of the surfactant introducing pump 43 under the same conditions as the sulfuric acid-introducing pump 41 to control the amount of the surfactant supplied in proportion to the amount of sulfuric acid. Of course, the introduction of sulfuric acid and the introduction of surfactant may be controlled in different ways.

On the other hand, the current measuring means 10 is provided in the electrolyzer 1 to measure the current of the electrolytic solution W. The current measuring means 10 is resistant to sulfuric acid and can be used for a long time to reduce the detection error And a platinum sensor having measurement reliability.

The platinum sensor, which is the current measuring means 10, is installed in the insulator 12 made of a synthetic resin such as a PVC (polyvinyl chloride) pipe or the like in the electrolytic bath 1 to minimize the detection error of the current measurement value . The temperature measuring means 20 may be, for example, a PT100.

On the other hand, the thickness and color of the plating are determined in proportion to the voltage and current value applied to the electrolyzer 1 and the anodizing time. At this time, the voltage and current of the power source for linearization film, that is, the set size, are applied to the anode busbar 2 and the cathode terminal 3 through the electric wires 2a and 3a by driving the rectifier 60 controlled by the controller 30 So that current flows through the electrolyte. At this time, the current value and the voltage value between the anode busbar (2) and the cathode terminal (3) vary depending on the concentration of sulfuric acid dissolved in the electrolytic solution.

Therefore, the controller 30 senses the current measured value of the electrolytic solution by using the current measuring means 10 and monitors the concentration of the dissolved sulfuric acid in the electrolytic solution. The temperature measurement value of the electrolyte is input.

The controller 30 not only stores the current measurement value measured through the current measuring unit 10 in the memory unit 31 but also outputs a first control signal by comparing the measured current value with the reference current value stored in the memory unit 31 The supply amount of sulfuric acid introduced into the electrolytic bath 1 from the sulfuric acid storage tank 40 is controlled to keep the sulfuric acid concentration of the electrolytic solution W in the electrolytic bath 1 constant. That is, the controller 30 compares the measured current value with the reference current value to determine whether the sulfuric acid is supplied or not from the sulfuric acid storage tank 40 in which sulfuric acid is stored. In order to maintain a constant current value in the electrolyte solution W When the measured current value of the electrolytic solution W is equal to or greater than the reference current value, the sulfuric acid-feeding pump 41 is stopped. When the measured current value of the electrolytic solution W is less than the reference current value, the sulfuric acid- Adjust the sulfuric acid concentration.

The controller 30 not only stores the temperature measurement value measured through the temperature measuring means 20 in the memory unit 31 of the controller 30 while controlling the sulfuric acid concentration, And outputs the second control signal to control the temperature adjusting means 50 to maintain the temperature of the electrolytic solution W in the electrolytic bath 1 constant.

In this case, for example, the reference concentration of sulfuric acid dissolved in the electrolyte is set to 10 ± 2 A and the voltage 15 ± 2 V based on 200 ± 50 g per liter, and the reference value of the electrolyte is 20 ± 1 for soft anodizing Lt; 0 > C, and in the case of hard anodizing treatment, for example, -5 < RTI ID = 0.0 >

More specifically, the hard anodizing treatment of a metal object, such as aluminum, forms a film having a thickness of 25 占 퐉 or more at a low temperature of 10 占 폚 or less, which is difficult to change color and has a high manufacturing cost, The soft anodizing treatment is carried out at a high temperature of 10 ° C or higher, which is advantageous in that the film is soft and the abrasion resistance is low while the color change is easy and the manufacturing cost is low. Accordingly, the present invention can perform a surface treatment operation after arbitrarily setting a time and a power source for an oxide film to be output by a user in correspondence with a desired thickness of a film to be plated with an object to be hardened and soft anodizing Or the formation of a soft coating. Therefore, it is preferable that the electrolytic solution (W) is maintained at 21 ± 1.5 ° C in the case of the soft anodizing treatment and at -5 ± 1.5 ° C in the case of the hard anodizing treatment. In the case of the soft anodizing treatment, the range of the reference temperature value is set to 19.5 DEG C and the upper limit value is set to 22.5 DEG C in the case of the soft anodizing treatment. In the case of the hard anodizing treatment, the lower limit value is set to -6.5 DEG C -3.5 ℃. Of course, it is natural that the range of the reference temperature value can be set differently according to the working environment.

If the measured temperature value of the electrolyte solution W measured by the temperature measuring means 20 exceeds the reference temperature value, the controller 30 controls the temperature adjusting means 50 to adjust the temperature of the electrolyte solution W do. In this case, the reference temperature value is set such that the temperature is lowered when the range of the reference temperature value is higher than the upper limit value of 22.5 ° C in the case of the soft anodizing process. In this case, the temperature adjusting means 50 is constituted by the freezer 51. On the other hand, the reference temperature value is set such that the temperature should be raised when the range of the reference temperature value is less than the lower limit value of -6.5 DEG C in the case of the hard anodizing treatment. In this case, the temperature adjusting means 50 is constituted by the heater 52. [

Accordingly, the temperature regulating means 50 may be constituted by only the refrigerator 51 or the heater 52 so as to drive only one of the soft or hard anodizing process, or the soft and hard anodizing process may be performed by the operator The refrigerator 51 and the heater 52 may be configured to be selectively driven.

When the temperature measurement value measured by the temperature measuring means 20 is out of the range of the reference temperature value, the controller 30 controls the supply of power for the oxidation coating of the rectifier 60 to the electrolytic bath 1 In this case, the controller 30 stops driving the temperature regulating means 50 when the temperature measurement value measured by the temperature measuring means 20 is within the setting range of the reference temperature value, The driving of the rectifier 60 is stopped and the refrigerator 51 or the heater 52 is selectively driven.

The controller 30 may include various types of industrial computers, and may be a PLC (programmable logic controller), for example.

The reference current value of the electrolytic solution W and the reference temperature value of the electrolytic solution W are set in the controller 30 and the reference current value and the reference temperature value of the electrolytic solution with respect to the set reference concentration of sulfuric acid, And a setting and display means (70) for displaying a current measurement value and a temperature measurement value. At this time, the setting and display means 70 is constituted by a touch screen 71 so that the condition monitoring and setting of the electrolytic bath 10 can be performed by one panel.

As described above, the operator can set the reference current value and the reference temperature value of the electrolyte, which is the reference concentration of sulfuric acid, with the touch screen 71, which is the setting and display means 70, The reference current value and the reference temperature value are inputted to the controller 30 to control the rectifier 60 to perform the anodizing process and at the same time the current measurement which is detected through the current measuring means 10 and the temperature measuring means 20 The value and the temperature measurement value are input to the controller 30 to compare whether or not they are within the set range of the reference current value and the reference temperature value and output the first and second control signals to control the sulfuric acid input pump 41 The sulfuric acid input amount of the sulfuric acid storage tank 40 is controlled and the temperature of the electrolytic solution W is also controlled.

In this case, the controller 30 also drives the pump 43 for introducing the surfactant when the sulfuric acid-containing pump 41 is driven, so that surfactant is also added in proportion to the amount of sulfuric acid to promote bubble activation of the electrolytic solution.

The controller 30 controls the current measurement value and the temperature measurement value of the current measurement means 10 and the temperature measurement means 20 in the sulfuric acid concentration control and the temperature adjustment process to the touch screen Touch Screen) and display it to the operator.

By maintaining the sulfuric acid concentration and the temperature of the electrolytic solution W constant through this series of processes, the defective rate of the object P to be subjected to the anodizing treatment can be greatly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary,

1: electrolytic cell 2: anode bus bar
3: cathode terminal 10: current measuring means
20: temperature measuring means 30: controller
31: memory unit 40: sulfuric acid storage tank
41: Sulfuric acid input pump 42: Surfactant storage tank
43: Pump for adding surfactant 50: Temperature control means
51: refrigerator 60: rectifier
70: Setting and displaying means 71: Touch screen
P: object to be plated W: electrolyte

Claims (6)

A current measuring means (10) for measuring a current value of an electrolytic solution (W) which is stored in the electrolytic bath (1) and forms a coating on the object to be plated (P); A temperature measuring means (20) for measuring the temperature of the electrolytic solution (W); The current measurement value inputted from the current measurement means 10 is compared with a preset reference current value to output a first control signal and the temperature measurement value inputted from the temperature measurement means 20 is set in advance A controller (30) for comparing and analyzing the reference temperature value and outputting a second control signal; A sulfuric acid input pump 41 for inputting sulfuric acid in the sulfuric acid storage tank 40 into the electrolytic bath 1 according to a first control signal of the controller 30; (50) for controlling the temperature of the electrolyte (W) in the electrolyzer (1) according to a second control signal of the controller (30)
The current measuring means 10 is a platinum sensor for measuring the current of the electrolytic solution,
A power source for the linear coating is applied to the anode busbar 2 and the cathode terminal 3 through the electric wires 2a and 3a by driving the rectifier 60 controlled through the controller 30;
The controller 30 not only stores the current measurement value inputted through the current measurement unit 10 in the memory unit 31 but also outputs the first control signal by comparing the measured current value with the reference current value stored in the memory unit 31 Controls the sulfuric acid input pump 41;
When the temperature measurement value of the electrolyte solution W measured by the temperature measurement means 20 is out of the reference temperature value, the controller 30 drives the temperature control means 50 to adjust the temperature of the electrolyte solution W Electrolytic current analysis and automatic sulfuric acid supply system of anodizing apparatus for metal.
The method according to claim 1,
Characterized in that the temperature measuring means (20) is PT100. The electrolytic solution current analysis and the sulfuric acid automatic supply system of the metal anodizing apparatus.
The method according to claim 1,
Wherein the controller (30) drives the refrigerator (51) when the temperature of the controller (30) exceeds 22.5 DEG C, which is an upper limit value of the reference temperature set during the soft anodizing process. Sulfuric acid automatic supply system.
The method according to claim 1,
Wherein the controller (30) controls a pump (43) for introducing a surfactant for controlling the amount of surfactant supplied to the surfactant reservoir (42). The analysis of the electrolyte current in the apparatus for anodizing the metal, Supply system.
The method according to claim 1,
The controller 30 is configured with a PLC (programmable logic controller);
The controller (30) sets the reference current value and the reference temperature value of the electrolyte solution (W) by the setting and display means (70);
The setting and display means 70 displays the reference current value and the reference temperature value of the electrolytic solution and the current measurement value and the temperature measurement value measured by the current measurement means 10 and the temperature measurement means 20, (71). The system for analyzing the electrolytic solution of the metal anodizing apparatus and the automatic supply system of sulfuric acid. delete

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