KR101048041B1 - Apparatus for auto input of sulfuric acid for anodizing treatment apparatus of metal - Google Patents

Abstract

PURPOSE: An automatic sulfuric-acid adding device of a metal anodizing device is provided to enable even a beginner to minimize anodizing failure of metal by automatically adding a certain amount of sulfuric acid to electrolyte to keep electric conductivity constant. CONSTITUTION: A sensing device(20) is immersed in electrolyte and the voltage and current of the electrolyte are sensed. A controller(40) controls power applied to the sensing device. The controller compares voltage and current input from the sensing device with predetermined reference voltage and current to output a control signal. An electronic valve(50) is arranged under a sulfuric-acid tank(60). The electronic valve opens/closes the tank using the control signal of the controller.

Description

Apparatus for Auto Input of Sulfuric Acid for Anodizing Treatment Apparatus of Metal}

The present invention relates to a device for automatically introducing sulfuric acid (sulfuric acid, sulfuric acid, H2SO4) to the electrolytic cell of the anodizing device of the metal, and more particularly, in the electrolytic cell for the surface treatment of the metal in the anodizing device of the metal. The present invention relates to a device for automatically introducing sulfuric acid so that the voltage and current values of the electrolyte solution stored in the capacity are kept constant.

In general, when anodizing (metal anodizing) treatment of metal is applied to the anode and the metal or parts are electrolyzed in a dilute-acid electrolyte, the oxide film (aluminum oxide) has a great adhesion with the base metal by oxygen generated from the anode. : Al2O3) is formed. Anodization is a compound word of anode and oxidation (anodizing). In addition, there is a difference from plating a metal part on a cathode in electroplating. The most representative material of anodization is aluminum (Al), and in addition, it is anodized to metal materials such as magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), and niobium (Nb). Processing. Recently, the anodizing treatment of magnesium and titanium materials is also increasingly used.

In general, anodizing on aluminum alloys, in which anodization is performed on an aluminum material surface, causes aluminum to be eroded and half an aluminum oxide film is formed by electrolysis of aluminum at an anode. Aluminum anodizing (anodic oxidation) can form a film having different properties depending on the composition and concentration of various electrolyte (treatment), additives, temperature, voltage, current, and the like of the electrolyte.

As the characteristics of the anodized film, the film is a dense oxide excellent corrosion resistance, improve the decorative appearance, the anodized film is quite hard, excellent wear resistance, improve the coating adhesion, improve the bonding (bonding) performance, It improves lubricity, displays unique colors for decorative purposes, enables pretreatment of plating, and detects surface damage.

In particular, the characteristic of hard anodizing is low temperature (or room temperature) electrolysis by the alloying property of aluminum, and it is a low temperature electrolytic method in sulfuric acid (H2SO4) solution. If it is 30 micrometers or more, it is hard. Aluminum metal surface is transformed into alumina ceramic using electric and chemical methods. When this method is applied, aluminum metal itself is oxidized and converted into alumina ceramic, and the surface of aluminum is stronger than steel and wear resistance is better than hard chromium plating. It does not peel off like plating or coating, and the changed alumina ceramic surface has excellent electrical insulation (1,500V), but electricity flows well inside. Advanced technologies using a hard-anodizing surface treatment method have been developed and applied to such aluminum metals.

In order to process the hard anodizing on the aluminum metal, the aluminum film is immersed in an electrolytic cell containing an acid solution, in particular an electrolyte in which sulfuric acid is dissolved, and then a certain voltage and current are applied to form an oxide film on the metal surface. The thickness of the oxide film varies with voltage and current. Furthermore, a certain amount of voltage and current values must be maintained in the electrolyte, and the voltage and current values vary depending on the concentration of sulfuric acid dissolved in the electrolyte. Therefore, a certain amount of sulfuric acid should be added to the electrolyte.

Conventional plating is a process of coating a certain thickness of the coating on the surface of the metal to enable the desired plating by the operator using a simple proficiency or predetermined data, the quality of the plating performed in this way was able to guarantee some quality, The anodizing surface treatment of dozens of alloys are deposited 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 also dissolved together. Accordingly, when anodizing the surface of the metal, sulfuric acid of a certain concentration is added to the electrolyte to remove foreign matter or dissolved aluminum remaining in the electrolyte, and the thickness and color of the film can be uniformly processed according to the concentration of sulfuric acid. That is, typically, about 200 grams of sulfuric acid should be dissolved in one liter of electrolyte. However, as the concentration of sulfuric acid is reduced during the anodizing of metal, a certain amount of sulfuric acid must be supplied to the electrolyte. This is to maintain a constant voltage and current value in the electrolyte solution for this purpose sulfuric acid is added.

Therefore, the hard anodizing surface treatment of aluminum metal was able to implement the thickness and color of the oxide film of the metal by a long skilled worker. In addition, skilled workers had to accept some degree of failure. Therefore, anodizing surface treatment with anodized metal by less skilled or novice workers has led to the disadvantage of increasing the defective rate and inefficient productivity.

In addition, since the voltage and current values of the electrolyte must be constant for uniform anodizing surface treatment of the metal, the concentration of sulfuric acid dissolved in the electrolyte must be constant. Therefore, the concentration of sulfuric acid dissolved in the electrolyte solution is not only troublesome to add a certain amount of sulfuric acid to the electrolytic cell, but also has a problem that it is more difficult to add the correct amount of sulfuric acid. Because of this, the time required to increase the film thickness of the metal is long, there is a problem that the manpower and cost for anodizing surface treatment of aluminum metal increases.

The present invention is to solve the above problems, it is to automatically input a certain amount of sulfuric acid to the electrolytic cell so that a constant voltage and current value can be maintained in the electrolytic solution by detecting and measuring the electrical conductivity of the electrolyte stored in the electrolytic cell in real time Purpose.

In addition, an object of the present invention is to automatically inject a certain amount of sulfuric acid to maintain a constant electrical conductivity in the electrolyte solution, so that even beginners can minimize the failure rate during anodizing treatment of the metal.

In addition, another object of the present invention is to enable the database to standardize, automate, and automate various data necessary for anodizing by sensing and measuring the electrical conductivity and temperature of the electrolyte stored in the electrolytic cell in real time.

In order to achieve the above object, the present invention provides a metal anodizing apparatus for immersing a plating object in an electrolytic cell in which a predetermined amount of electrolyte is stored, and applying an electric power to the electrolyte to anodize the plating object. A sensing device for sensing voltage and current values of the electrolyte; A controller for controlling the power applied to the sensing device and outputting a control signal by comparing a voltage and current value input from the sensing device with a preset reference voltage and current value; And a solenoid valve provided under the storage tank in which sulfuric acid is stored to open and close the storage tank with a control signal of the controller to inject and block the sulfuric acid into the electrolytic cell through a pipe. And it is characterized in that the sulfuric acid automatic input device of the metal anodizing treatment device to maintain a constant amount of sulfuric acid (H 2 SO 4) to the electrolytic cell to keep the voltage and current value of the electrolyte if less than the current.

The present invention improves the quality, productivity, convenience of work and anodizing of metal anodized plating products by adding a certain amount of sulfuric acid to maintain a constant voltage and current value in the electrolyte solution stored in the electrolytic cell by the above solution means. The work efficiency of the processing device is maximized.

1 is a block diagram showing a sulfuric acid automatic dosing device of the anodizing device for metal according to the present invention.
2 is a view schematically showing a sulfuric acid automatic dosing device of the anodizing treatment of metal according to the present invention.
3 is a circuit diagram of applying a rectified DC power supply to the sensing device in the controller according to the present invention.

Hereinafter, with reference to the accompanying drawings with respect to the automatic sulfuric acid input device of the anodizing treatment apparatus for metals according to the present invention will be described in detail.

The present invention is to automatically input a certain amount of sulfuric acid to maintain a constant voltage and current value by measuring and detecting the electrical conductivity of the electrolyte stored in the electrolytic cell in the anodizing treatment of metal.

In FIG. 1, a predetermined amount of electrolyte is stored in the electrolytic cell 10 of the metal anodizing apparatus. The plating object is immersed in the electrolytic cell 10, and a predetermined size of power is applied to the electrolytic solution so that the plating object is anodized.

The sensing device 20 is immersed in the electrolyte to measure and measure the electrical conductivity of the electrolyte, that is, a voltage and current value of a predetermined size. In FIG. 2, in FIG. 2, a negative electrode 22 is integrally coupled to an inner surface of a cylindrical insulator 21 having a top and a bottom open. That is, the cylindrical negative electrode 22 is integrally coupled to the inner wall of the insulator 21. In addition, a plurality of through holes 23 are formed in the negative electrode 22 integrally coupled with the insulator 21 so that the electrolyte can be freely distributed. The negative electrode 22 is connected from the controller 40 to the terminal 28 via the wire e2. The positive electrode 26 is located in the center of the cylindrical negative electrode 22 and is connected from the controller 40 to the terminal 27 via the wire e1. The cap 24 is screwed on the insulator 21. Cap 24 is formed in the through hole 31, 32 in the center and one side, respectively. The support member 25 for penetrating and supporting the positive electrode 26 is fixedly coupled to the through hole 31 formed in the center of the cap 24, and the through hole 32 formed at one side of the cap 24 is provided in the through hole 31. The negative electrode 22 penetrates and is connected to the terminal 28 and the electric wire e2.

In addition, the fixing member 29 is formed extending from one side of the cap 24. The fixing member 29 is for fixing and supporting the sensing device 20 on the top of the electrolytic cell 10, so that the sensing device 20 does not easily flow.

The insulator 21 is made of synthetic resin, in particular PVC (polyvinyl chloride) pipe, etc., the negative electrode 22 and the positive electrode 26 is metal, in particular lead is applied, cap ( 24 and the fixing member 29 is made of a non-conductor or insulating material synthetic resin or metal, the support member 25 is a synthetic resin or rubber.

The controller 40 controls the power applied to the sensing device 20, and outputs a control signal by comparing the power, that is, the voltage and current values input from the sensing device 20, with a preset reference voltage and current value. It is. The controller 40 includes a memory unit 47, and the memory unit 47 stores all data input to the controller 40, and stores reference data regarding temperature, voltage and current values, and sulfuric acid input amount. The input data stored in the memory 47 is reset to reference data for anodizing the metal or used as a standardized database or data table.

The controller 40 further includes a thermometer 30 that is immersed in the electrolyte to sense the temperature of the electrolyte, and the controller 40 controls the heater 61 installed in the sulfuric acid storage tank 60 to be heated to thereby electrolyzer 10. It controls to match the temperature of sulfuric acid introduced into the temperature of the electrolyte solution. Therefore, the controller 40 senses the temperature of the electrolyte and heats sulfuric acid introduced into the electrolyte with a heater 61 to make the same temperature as that of the electrolyte. In addition, the sulfuric acid storage tank 60 is also provided with a thermometer 33 to allow the controller 40 to control the operation of the heater 61.

The solenoid valve 50 is provided under the storage tank 60 in which sulfuric acid is stored, and opens and closes the storage tank 60 in which sulfuric acid is stored as a control signal of the controller 40 to inject sulfuric acid into the electrolytic cell 10 through the pipe 51. To block.

In addition, the controller 40 visually displays the temperature of the thermometer 30, the voltage and current values measured and detected from the sensing device 20, and the amount and time of sulfuric acid input to the electrolyte through the solenoid valve 50. The display panel 41 is further included. The display panel 41 includes a voltage display 42, a current display 43, a time display 44, and a temperature display 45. The display panel 41 further includes a toggle switch 46 to select a power source by an operator.

In addition, in Figure 3, the controller 40 is provided with a toggle switch (T / S) to select the power applied to the sensing device 20. That is, by operating the toggle switch T / S, the AC power applied to the R and S stages can be selected from the primary side of the transformer T to the first stage or the second stage, and thus to the secondary side of the transformer T. Allow the induced power to be applied. In addition, the power supplied to the secondary side of the transformer T is rectified through the diodes D1 and D2 so that a positive DC power is applied. And a negative (-) DC power source is provided with a timer (T / S) so that the DC power can be applied for a set time.

In the present invention, the concentration of sulfuric acid dissolved in the electrolyte is 200 ± 50 g per liter, the detected current is 10 ± 2A, the detected temperature is 20 ± 1 ℃, the detected voltage is 15 ± 2V, anodizing treatment of metal The time should be 30 ± 2 minutes.

In addition, sulfuric acid may contain a biosurfactant to promote bubble activation of the electrolyte.

Sulfuric acid automatic dosing device of the metal anodizing treatment device of the present invention is determined the thickness and color of the plating in proportion to the voltage and current value applied to the electrolytic cell and the anodizing treatment time. The controller 40 applies a predetermined voltage and current to the positive electrode 26 and the negative electrode 22 through the wire e1 through the sensing device 20. Positive (+) The current flows between the electrode 26 and the negative electrode 22 through the electrolyte filled in the negative electrode 22. The current value depends on the concentration of sulfuric acid dissolved in the electrolyte. And the voltage value between the positive electrode 26 and the negative electrode 22 also changes, so that the controller 40 has a positive electrode 26 and a negative electrode. By sensing the voltage and the current value between the electrodes 22 to measure and detect the concentration of sulfuric acid dissolved in the electrolyte, and the controller 40 is also received along with the temperature value of the electrolyte through the thermometer (30). The controller 40 stores the input data in the memory unit 47, compares the reference data stored in the memory unit 47 with the reference data stored in the memory unit 47. The input and input amount will be determined.

In order to maintain a constant voltage and current value in the electrolyte, if the concentration of sulfuric acid dissolved in the electrolyte is within the setting criteria, the solenoid valve 50 is not opened. If the concentration of sulfuric acid dissolved in the electrolyte does not meet the setting criteria, Open the solenoid valve 50. At this time, the amount of sulfuric acid introduced from the solenoid valve 50 is measured to monitor the closing time of the solenoid valve 50. Furthermore, the controller 40 senses the temperature of the electrolyte and preheats the sulfuric acid reservoir 60. This is because sulfuric acid at a lower temperature than the electrolyte is introduced into the electrolyte, thereby lowering the temperature of the electrolyte, thereby minimizing a defect rate in the anodizing treatment of the metal.

In addition, all data input and output to the controller 40 are stored in the memory unit 47 and used as reference data for anodizing the metal. Furthermore, the standardized data is prepared in a table so that an operator can perform an improved metal anodizing process only by monitoring the display panel 41 of the controller 40.

Therefore, the sulfuric acid automatic dosing device of the metal anodizing treatment apparatus of the present invention can maintain the concentration of sulfuric acid in the electrolyte solution stored in the electrolytic cell, thereby allowing the skilled person as well as beginners to minimize the plating defect rate during anodizing treatment And it can improve the reliability, there is an advantage that can improve the efficiency and productivity of the work.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

10: electrolyzer 20: detector
21: insulator 22: negative electrode
23: through hole 24: cap
25: support member 26: positive electrode
27, 28: terminal 29: fixing member
30, 33: thermometer 31, 32: through
40: controller 41: display panel
42: voltage indicator 43: current indicator
44: time display 45: temperature display
46, T / S: Toggle Switch 47: Memory Section
50: solenoid valve 60: reservoir
61: heater e1, e2: electric wire
T: transformer D1. D2: diode
S / T: timer

Claims (10)

In the metal anodizing apparatus for immersing the plating object in the electrolytic cell 10 in which the electrolyte is stored, and applying an electric power to the electrolyte solution to anodize the plating object,
A sensing device 20 which is immersed in the electrolyte to sense voltage and current values of the electrolyte;
A controller 40 for controlling the power applied to the sensing device 20 and comparing a voltage and current value input from the sensing device 20 with a preset reference voltage and current value to output a control signal;
A solenoid valve 50 provided below the storage tank 60 in which sulfuric acid is stored to open and close the storage tank 60 by the control signal of the controller 40 to inject and block the sulfuric acid into the electrolytic cell 10 through the pipe 51; Including but not limited to:
A thermometer 30 is further provided to sense the temperature of the electrolyte by being immersed in the electrolyte, and the controller 40 controls the heater 61 installed in the sulfuric acid storage tank 60 to be heated and is introduced into the electrolytic cell 10. A sulfuric acid automatic dosing device for an anodizing device for metals that matches the temperature of sulfuric acid with that of the electrolyte.
According to claim 1, wherein the controller 40 includes a memory unit 47, the memory unit 47 stores all data input to the controller 40, the temperature, voltage and current values and sulfuric acid input amount Sulfuric acid automatic dosing device for metal anodizing device in which reference data are stored.
3. The sulfuric acid automatic dosing device of the metal anodizing apparatus of claim 2, wherein the input data stored in the memory unit (47) is reset to reference data for anodizing the metal.
2. The sulfuric acid automatic dosing device of claim 1, wherein the controller (40) includes a display panel (41) for visually displaying temperature, voltage, and current values, and sulfuric acid input amount and time.
According to claim 1, wherein the concentration of sulfuric acid dissolved in the electrolyte is 200 ± 50g per liter, the sensed current is 10 ± 2A, the sensed temperature is 20 ± 1 ℃, the detected voltage is 15 ± 2V, metal Sulfuric acid automatic dosing device for metal anodizing device whose anodizing time is 30 ± 2 minutes.
The sulfuric acid automatic dosing device of claim 1, wherein the sulfuric acid contains a biosurfactant to promote bubble activation of the electrolyte.
According to claim 1, wherein the controller 40 is provided with a toggle switch 46 sulfuric acid automatic injecting device of the metal anodizing device to select the power applied to the sensing device (20).
The method of claim 1, wherein the sensing device 20
Cylindrical insulator 21 having an upper portion and an lower portion opened,
A negative electrode 22 integrally coupled to an inner surface of the insulator 21 and connected to a terminal 28 via a wire e2 from the controller 40,
A positive electrode 26 positioned in the center of the negative electrode 22 and connected to the terminal 27 via a wire e1 from the controller 40;
The positive electrode 26 is fixed to the through hole 31 formed at the center of the insulator 21 through the support member 25, and the negative electrode 22 and the terminal ( A cap 24 having a through hole 32 formed therein so as to be connected thereto;
Sulfur automatic input device of the metal anodizing treatment device including a fixed member 29 is formed extending to one side of the cap 24 to support the sensing device 20 on the top of the electrolytic cell (10).
The negative electrode 22 integrally coupled to the insulator 21 has a plurality of through holes 23 formed therein, and the negative electrode 22 and the positive electrode 22 are formed in the negative electrode 22. The electrode 26 of) is an automatic sulfuric acid input device of the anodizing device of a metal which is a conductor containing lead (Pb). delete

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