KR20050016855A - Electrochemical indirect etching method for aluminium plate by continuous automatic system - Google Patents

Abstract

PURPOSE: To provide a method for electrochemical indirect etching of aluminium sheet by continuous automatic system, wherein processes and conditions suitable for mass-production are set to lower unit cost of product, a certain high product quality is maintained by condition setting according to testing of final product, and loss of the solution is prevented by automatically controlling a solution and circulating the solution. CONSTITUTION: The method for electrochemical indirect etching of aluminium sheet by continuous automatic system comprises a cleaning step of washing the aluminum sheet after removing oils and fats and foreign materials adhered to the surface of the aluminum sheet by spraying a sulfuric acid solution; an activation treatment step of washing the aluminum sheet using water after uniformizing surface roughness of the aluminum sheet by spraying a sodium hydroxide solution onto the surface of the cleaned aluminum sheet; an electrochemical indirect etching step of washing the aluminum sheet using water after spraying a hydrochloric acid solution onto the surface of the activation treated aluminum sheet and supplying an indirect power source to the sheet to electrochemically etch one side of the aluminum sheet; a neutralization step of washing the aluminum sheet using water after neutralizing the aluminum sheet by spraying a nitric acid solution onto the surface roughness formed aluminum sheet to improve adhesion between the aluminum sheet and fluorocarbon resin; an anodizing film coating step of washing the aluminum sheet using water after forming an anodizing film on the other side of the aluminum sheet by spraying a sulfuric acid solution onto the aluminum sheet and supplying an indirect power source to the sheet, thereby anodizing an non-indirect etched other side of the neutralized aluminum sheet to prevent oxidation of the aluminum sheet; and a cleaning and drying step of removing moisture and humidity existing on the surface of the sheet after cleaning the sheet by dipping the anodizing film coated aluminum sheet into water of high temperature.

Description

ELECTROCHEMICAL INDIRECT ETCHING METHOD FOR ALUMINIUM PLATE BY CONTINUOUS AUTOMATIC SYSTEM}

The present invention relates to an electrochemical etching method by a continuous automation system of aluminum sheet, and more particularly, in the in-line continuous automation equipment, each process is continuously transferred, so that cleaning, washing and activating treatments suitable for the in-line process are performed. In addition to the development of electrochemical indirect etching, neutralization, and anodization coating processes, the electrochemical process of the aluminum sheet continuously takes into account the temperature, concentration, and liquid exchange cycle independently of the line speed. It relates to an indirect etching method.

Aluminum plate used for kitchen utensils or electronic / mechanical parts is coated with fluorocarbon resin to give surface characteristics.

In order to coat the fluorocarbon resin on the surface of the aluminum plate in the kitchen utensils, etc., the surface is mechanically, chemically and electrochemically applied to increase the adhesion to the surface.

Conventional conventional method is to install a plate in a rack, etch it, and then go through a series of processes such as water washing and anodizing, take it out of the rack, and apply carbon fluorocarbon resin to produce a product. In addition to the repetition of, the work between processes is partly automated by manual and hoist.

Due to the manual work performed between these processes, productivity is low, and there is difficulty in maintaining quality due to inadequate treatment or delay in processing time.In addition, workers avoid as 3D businesses due to mist or gas generated during production, resulting in production efficiency. Is falling and raising production costs.

In order to solve the above problems of the prior art, the present invention develops cleaning, water washing, activation treatment, electrochemical indirect etching, neutralization treatment, anodizing film processing process suitable for in-line process automation close to unmanned Independently developing optimum conditions considering temperature, concentration, and liquid exchange cycle. Finally, it is possible to improve adhesion with aluminum sheet when coating fluorocarbon resin, and to continuously reduce cost and maintain high quality. Its purpose is to provide an electrochemical indirect etching method by an automated system.

In order to achieve the above object, the present invention comprises a washing step of mechanically polishing the aluminum plate after spraying sulfuric acid (H ₂ SO ₄ ) solution to remove the oil and fat adhered to the surface, and then washed with water; An activation treatment step of injecting a sodium hydroxide (NaOH) solution onto the surface of the cleaned aluminum plate to equalize the roughness of the surface and then washing with water; An electrochemical indirect etching step of electrochemically etching one surface of aluminum by supplying an indirect power supply while injecting hydrochloric acid (HCl) solution to the surface of the activated aluminum plate, and then washing with water; A neutralization treatment step of spraying nitric acid (HNO ₃ ) solution on the surface roughness formed aluminum plate to neutralize the fluorocarbon resin to improve adhesion to the fluorocarbon resin, and then flush with water; Anodized on the other side of the aluminum by supplying an indirect power supply while injecting sulfuric acid (H ₂ SO ₄ ) solution to prevent oxidation by anodizing the other side of the plate that is not indirectly etched to the neutralized aluminum plate. Anodizing film treatment step of forming and washing with water; Electrochemical indirect etching by the continuous automation system of the aluminum plate, characterized in that consisting of a cleaning and drying step of removing the moisture and moisture present on the surface of the plate after cleaning the anodized aluminum plate by hot water. Provide a method.

In addition, in the cleaning step, the surface of the aluminum plate by spraying the cleaning solution mixed with 10-30% sulfuric acid (H ₂ SO ₄ ) solution and 5 ~ 100ppm corrosion inhibitor at 60 ~ 80 ℃ temperature It provides an electrochemical indirect etching method by a continuous automation system of aluminum sheet, characterized in that to remove the oil and foreign matter attached to the,

In addition, the present invention in the activation process step, spraying the cleaning solution mixed composition of 1 ~ 15% sodium hydroxide (NaOH) solution and 5 ~ 100ppm corrosion inhibitor on the surface of the cleaned aluminum plate at a temperature of 40 ~ 80 ℃ It provides an electrochemical indirect etching method by the continuous automation system of the aluminum sheet, characterized in that to equalize the roughness of the surface.

In addition, the present invention, in the electrochemical indirect etching step, by spraying a 1 ~ 10% hydrochloric acid (HCl) solution at a temperature of 20 ~ 60 ℃ on the surface of the activated aluminum sheet 10 ~ 40A / It provides an electrochemical indirect etching method by a continuous automation system of aluminum sheet, characterized in that the electrochemical etching of one surface of aluminum at a current density of dm ² ,

In addition, in the neutralization step of the present invention, the neutralizing treatment by spraying the cleaning solution mixed with a 20 ~ 40% nitric acid (HNO ₃ ) solution and 5 ~ 100 ppm of corrosion inhibitor on the aluminum plate formed surface roughness at room temperature It is to provide an electrochemical indirect etching method by a continuous automation system of the aluminum sheet.

On the other hand, the present invention, in the anodized film treatment step, 10 to 20% sulfuric acid (H ₂ SO ₄ ) solution to prevent corrosion by anodizing the other surface not indirect etching in the neutralized aluminum sheet and Anodic oxide film is formed on the other side of aluminum with current density of 1 ~ 10A / dm ² by indirect power supply method while spraying cleaning solution mixed with 5 ~ 100ppm corrosion inhibitor at 10 ~ 30 ℃. It provides an electrochemical indirect etching method by a continuous automation system of aluminum sheet,

In addition, in the cleaning and drying step, the present invention is a continuous automation system of aluminum sheet, characterized in that the sealing and surface stains are removed through at least one hot water bath for dipping the anodized aluminum sheet by hot water. It provides an electrochemical indirect etching method by.

Hereinafter, the electrochemical etching method by the continuous automation system of the aluminum sheet for each process constituting the present invention will be described in detail.

1 is a process chart showing the process of the electrochemical indirect etching method by a continuous automation system of aluminum sheet according to the present invention.

First, the present invention is to improve the adhesion to the fluorocarbon resin by etching the surface of the aluminum plate before coating the fluorocarbon resin on the surface of the aluminum plate used as kitchen utensils by coating the fluorocarbon resin on the surface It is characteristic.

For such etching, the electrochemical indirect etching method by the continuous automation system according to the present invention, as shown in Figure 1, washing step → activation treatment step → electrochemical indirect etching step → neutralization step → anodizing film It is composed of the order of treatment step → washing and drying step.

Figure 2 is a schematic diagram of a facility for performing the electrochemical indirect etching method of the aluminum plate by the continuous automation system according to the present invention, Figure 3 is an electrochemical indirect etching method by the continuous automation system of the aluminum plate according to the present invention. 4 is a schematic diagram of the electrochemical indirect etching means used, and FIG. 4 is a schematic diagram of the anodizing means used in the electrochemical indirect etching method by the continuous automation system of the aluminum sheet according to the present invention.

The electrochemical indirect etching method of the continuous automation system according to the present invention having the above-described process sequence is performed by the continuous automated processing equipment as shown in FIG. 2, and more specifically, the electrochemical indirect etching shown in FIG. 3. Etching means and anodization film processing means shown in FIG.

The following briefly describes the configuration of the continuous automated processing equipment used in the present invention, the present invention can be carried out by changing the equipment without being limited to the equipment described below.

As shown in Figure 2, the continuous automated processing equipment used in the present invention is supplied with an aluminum sheet (1) and chemical cleaning bath (2) for removing foreign matter adhering to the surface by spraying sulfuric acid solution, and discharged therefrom It consists of the cleaning means 10 which consists of the 1st water washing tank 3 which sprays and wash | cleans water to the upper and lower surfaces of the board | plate material used,

Then, the surface of the aluminum plate 1 discharged from the cleaning means 10 by spraying a sodium hydroxide solution on the roughness uniformity tank 4 for uniformly treating the surface roughness and the upper and lower surfaces of the plate discharged therefrom. The active treatment means 20 which consists of the 2nd washing tank 5 which sprays water and wash | cleans is provided,

An electrochemical etching bath 6 for supplying an indirect power supply while spraying hydrochloric acid solution to the aluminum sheet 1 discharged from the active treatment means 20 to form a rough surface on the surface of the aluminum sheet 1; An electrochemical indirect etching means 30 comprising a third water bath 7 for spraying and cleaning water on upper and lower surfaces of the discharged sheet material is provided.

In addition, neutralization treatment tank 8 for spraying and neutralizing nitric acid solution on the surface of the aluminum sheet 1 discharged from the electrochemical indirect etching means 30, and water is sprayed on the upper and lower surfaces of the plate discharged therefrom And neutralization treatment means (40) consisting of a fourth wash tub (9) for cleaning.

Anodizing film treatment tank 11 for supplying an indirect power supply by injecting sulfuric acid solution to the surface of the aluminum plate 1 discharged from the neutralization means 40 to form an anodized film, and the plate discharged therefrom. Anodizing film treatment means (50) consisting of a fifth washing tank (12) for spraying water on the upper and lower surfaces and the plate material discharged from the anodizing film treatment means (50) are completely deposited and cleaned by high temperature water. The washing-drying means 13 and the washing-drying means 60 which consist of the dryer 14 which dry | cleans the board | substrate with which cleaning was completed are provided.

Looking at the configuration of the electrochemical indirect etching means 30 and the anodic oxidation treatment means 50 in more detail, the feed roller 15 of the transfer line of the device portion is a power transmission motor, a reducer, a chain (not shown) It is configured to be driven, and in particular, the transfer roller 15 is made of a material that is chemically resistant and can withstand temperatures of about 300 ° C. and can be transported with adhesion to the plate 1, but has a thickness of 10 to 30 mm therein. An elastic rubber material is coated on the shaft and the outside to have an outer diameter of 50 to 90 mm, and the distance between the feed roller 15 and the roller is 50 to 150 mm.

Electrochemical etching bath (6) is provided with an electrode 45, the power contact of the electrode 45 in the process of power supply is installed in accordance with the surface treatment direction of the plate material 1 and designed to be smoothly supplied shall.

The electrode 45 is positioned so that the interval between the roller 15 and the roller 15 is 1 ~ 15mm in the space between the installed feed roller 15, the electrode 45 is an electric wiring and a rectifier 41 for supplying power To 48.

In addition, the electrode 45 is composed of a positive electrode and a negative electrode, the material of the positive electrode and the negative electrode using a carbon rod in consideration of the amount of current passing through, but in the form of a rectangular parallelepiped 1 ~ 15㎜ distance to the plate 1 It is configured to maximize the effect of the etching to ensure that the power supply is made smoothly when in contact with the solution by maintaining.

In addition, the diaphragm 47 is provided before the arrangement of the anode after the anode and the cathode in the electrode 45 so that the current does not affect the next electrode.

An injection nozzle 46 for injecting a solution is installed on an upper portion of each electrode 45 installed as described above.

That is, the injection nozzle 46 is sprayed from the upper portion in the amount of 1 ~ 10ℓ / min in the nozzle size of 1 ~ 7mm diameter so that the treatment solution is evenly sprayed on one surface of the plate 1 to be transferred, nozzle interval Considering the nozzle diameter is to be arranged between the feed roller 15 and the roller, that is, the upper portion of the electrode 45 at a predetermined interval within the range of 50 ~ 150mm.

The treatment solution injected into the injection nozzle 46 installed as described above is once accommodated in the treatment tank 6a, and when the water level of the treatment tank 6a becomes high and the used solution overflows to both sides, the solution is piped to the lower part. It flows into the installed storage tank 43.

Since the pipe of the storage tank 43 is additionally provided with an auxiliary filter 44 for preventing the mixing of the reaction product or foreign matter contained in the used solution, the life of the solution flowing into the storage tank 43 Can be extended, and the performance of the treatment solution can be maintained during recycling.

Therefore, it is piped with the storage tank 43 so that the filtration and circulation pump 42 to the injection nozzle 46 can always supply a stable treatment solution.

The treatment tank 6a provided inside the electrochemical etching bath 6 is made of a material that can withstand a temperature of about 150 ° C. while being made of a material having chemical resistance in the above process.

In addition, the size of the outlet to allow the treatment solution flows into the storage tank 43 is designed so that the solution is filled in the range of 5 ~ 15㎜ based on the surface of the plate in consideration of the flow rate and then flow down to the plate (1) Control the reaction between and the solution.

In addition, the electrochemical etching bath (6) is provided with a separate temperature control means, which is connected to the temperature sensor 49 installed on one side of the storage tank 43, the heater installed in the lower portion of the storage tank (43) 48).

That is, when the temperature of the solution is detected from the temperature sensor 49, the heater 48 is configured to operate automatically accordingly.

In addition, the electrochemical etching bath 6, the electrochemical indirect etching process of the present invention is provided with a separate concentration adjusting means on one side, which is connected to the concentration sensor 53 installed on one side of the storage tank 43. And a feed pump 52 for supplying the solution stock solution and a stock solution tank 51 piped thereto.

That is, when the concentration of the solution contained in the storage tank 43 is sensed from the concentration sensor 53, the supply pump 52 is operated accordingly to configure the feedstock of the solution from the stock solution tank 51.

As shown in Fig. 4, the anodizing tank 11 in which the anodizing film treatment process of the present invention is performed is almost similar to the configuration of the electrochemical etching bath 7 described above, and the only difference is In the power supply, the cathode 45b of the electrode 45 is disposed above the plate 1, and the anode 45a is disposed below the plate 1 so that the cathode 45b of the electrode 45 and the anode ( One side of the plate 1, which is positioned to face 45a) and is conveyed, is configured to be anodized. The apparatus is configured as shown in Figure 3, but similar to the electrochemical etching apparatus, the difference is in the power supply to place the negative electrode on the upper portion of the plate and the positive electrode on the lower portion of the plate to face the negative electrode of the plate The surface is anodized.

In addition, the above-described electrochemical etching tank 7 is provided with temperature control means (temperature sensor, heater) for controlling the temperature in the storage tank 43, while the anodizing film treatment tank 11 is Since the heat exchanger 61 is piped with the storage tank 43 instead of the heating means, the temperature of the solution is kept constant according to the temperature detected by the temperature sensor 49.

The other device portion is configured similarly to the configuration of the electrochemical etching bath 7 described above.

The cleaning step constituting the electrochemical indirect etching method by the continuous automation system of the aluminum sheet of the present invention using the continuous automation equipment described above is a process of removing fats and oils adhered to the aluminum sheet whose surface is polished to an appropriate roughness.

The cleaning step is to maintain and transfer the aluminum plate is continuously sprayed with 10 ~ 30% sulfuric acid (H ₂ SO ₄ ) solution and 5 ~ 100ppm corrosion inhibitor at 60 ~ 80 ℃ temperature It consists of a chemical cleaning process that chemically removes foreign substances and a cleaning process that continuously transports the chemically cleaned aluminum sheet by spraying water from the top and the bottom simultaneously.

The aluminum plate that has undergone the cleaning step as described above is subjected to the uniformity of surface roughness for etching on one surface thereof through an activation treatment step.

This activation step is to continuously transfer the activated treatment solution mixed with 1 ~ 15% sodium hydroxide (NaOH) solution and 5 ~ 100 ppm corrosion inhibitor at a temperature of 40 ~ 80 ℃ while continuously transporting the roughness of one side It consists of a roughness homogenization process that makes it uniform, and a washing process of cleaning and transporting the aluminum sheet, which has undergone such roughness homogenization process, while being continuously sprayed from above and below with water.

As described above, the aluminum plate that has undergone the roughening uniformity step is etched in one surface of the electrochemical indirect etching means shown in FIG. 3 in order to form a rough surface on one surface to improve adhesion to the fluorocarbon resin.

This electrochemical indirect etching step is composed of 1 ~ 10% hydrochloric acid (HCl) and continuously transported while spraying from above at a temperature of 20 ~ 60 ℃, so that the treatment liquid is filled to cover the plate 5 to 15 mm An electrochemical etching process that electrochemically etches one surface of aluminum at a current density of 10 to 40 A / dm ² using an indirect power supply by adjusting the flow rate, and simultaneously the surface of the etched aluminum sheet with water from above and below. It consists of a washing process to wash while continuously transporting while spraying.

As described above, the aluminum sheet which has undergone the electrochemical indirect etching step reduces the adhesion to the fluorocarbon resin by forming a smut, and thus, neutralizes the treatment to remove the smat to improve the adhesion to the fluorocarbon resin. Conduct.

The neutralization step is performed by spraying the activated treatment solution mixed with 20 to 40% nitric acid (HNO ₃ ) solution and 5 to 100 ppm of corrosion inhibitor at room temperature from above for several tens of seconds to 5 minutes in succession. Neutralization process to remove the, and the washing process to continuously and while transporting the aluminum plated through the neutralization process while simultaneously spraying the plate from the top and bottom with water, and additionally while spraying from above and below with a stream of water stronger than the cleaning process It consists of a jet washing process that is continuously transported.

As described above, the other side of the neutralized aluminum sheet may be prevented from corrosion by forming an oxide film in the anodizing step.

That is, in the anodizing step, the cleaning solution mixed with 10 to 20% sulfuric acid (H ₂ SO ₄ ) solution and 5 to 100 ppm of corrosion inhibitor is sprayed at a temperature of 10 to 30 ° C. to be continuously transferred. The anode which anodizes the other side of the aluminum sheet with the current density of 1 ~ 10 A / dm ² by using the indirect power supply method by adjusting the flow rate so that the processing liquid is filled to cover the sheet with 5 ~ 15㎜. Oxide film forming process, it consists of a washing process that is continuously transported and washed while spraying from the top and bottom with water at the same time.

In the anodizing film treatment step, the aluminum plate formed with the anodized film is sprayed at the same time by spraying from the top and bottom using hot water at the same time to prevent stains generated during the drying process, or deposited on hot water and transported through a transfer line, and Finishing is performed through a washing and drying step consisting of a drying process for removing the moisture and moisture of the surface of the hot plate is completed.

In each step process, the treatment liquid is reused in a circulating manner using a storage tank, and the washing liquid is supplemented with water by an automatic controller, and the water is exchanged after a certain time by analyzing the content of foreign substances. Control is to maintain a constant temperature through the thermostat, to automatically replenish the liquid periodically using a concentration regulator, and to change the solution after a certain period of time.

In such a plate of the electrochemical indirect etching process is completed, the automation line can be completed in connection with the existing aluminum continuous automatic coating device.

Hereinafter, the operation of the present invention according to the embodiment.

Aluminum sheet roughness, cross cut test, salt spray test and saline deposition test method and acceptance criteria of the specimen prepared by the electrochemical indirect etching method by the continuous automation system of the aluminum sheet of the present invention as described above Described below.

[Picture of surface and roughness test of plate]

The photograph shown in FIG. 5 shows the surface formation and roughness test results of the rough plate until the electrochemical etching process, and the surface shape is a uniform surface with protrusions and pore structure, which is expected to form excellent adhesion when coating fluorocarbon resin. As the acceptance criteria, the surface shape similar to the shape was obtained, and the numerical value suitable for the adhesive force also in the roughness was set to Ra = 0.8 to 2.5, as shown in FIG.

[Cross cut test result of plate]

7 to 8 show the results of cross-cut testing of two flat products and one curved product in a product that has undergone all the processes up to the fluorocarbon resin coating and has been formed into a product.

As shown in Fig. 7 to 8, the acceptance criteria were selected based on 100/100, the flat product and the bend in the rough product until all the processes up to the fluorocarbon resin coating and molding to the shape of the product The two products with the salt spray test using a salt spray tester,

The brine deposition test was established based on the absence of corrosion due to defects in the coating layer over 120 hours in the salt spray test and over 60 hours in the salt spray test.

[Standard Conditions]

1) Cleaning step

Component of solution: 20% sulfuric acid (H ₂ SO ₄ ) solution

Solution temperature: 70 ℃

2) Activation Process

Component of solution: 3% sodium hydroxide (NaOH) solution

Solution temperature: 70 ℃

3) Indirect Etching Step

Component of solution: 5% hydrochloric acid (HCl) solution

-Solution temperature: 40 ℃

Power supply: 30 A / dm ²

4) Neutralization Step

Component of solution: 30% nitric acid (HNO ₃ ) solution

-Solution temperature: Room temperature

5) Anodizing step

Component of solution: 15% sulfuric acid (H ₂ SO 4) solution

Solution temperature: 10 ~ 30 ℃

6) Evaluation

Surface Photo Result: Passed

Surface Roughness Ra = 1.41

Cross Cut Test Result: 100/100

Salt spray test: More than 120 hours

Saline deposition test: More than 60 hours

Based on the above conditions, the results of the aluminum sheet roughness, the cross cut test, the salt spray test, and the salt deposition test performed with the parameters of the step-by-step conditions are described in each example.

Example 1

Change of cleaning stage condition

1) Cleaning step condition

2) Cleaning step condition

3) Cleaning step condition

4) Cleaning step condition

Example 2

Activation process step conditions change

1) Activation step conditions

2) Condition of activation process

3) Condition of activation process

4) Condition of activation process

Example 3

-Chemical indirect etching step condition change

1) Indirect etching step condition

2) Indirect Etching Step Conditions

3) Indirect Etching Step Conditions

4) Indirect Etching Step Conditions

5) Electrochemical Indirect Etching Step Conditions

6) Indirect Etching Step Conditions

7) Electrochemical Indirect Etching Stage Conditions

8) Indirect Etching Step Conditions

Example 4

-Neutralization step condition change

1) Neutralization Step Conditions

2) Neutralization Step Conditions

3) Neutralization Step Conditions

4) Neutralization Step Conditions

As described above, the present invention relates to an electrochemical indirect etching method using a continuous automation system of aluminum sheet, which is suitable for in-line cleaning, washing, activating, electrochemical indirect etching, neutralization, and anodizing. In addition to the development, each process has developed an electrochemical optimal condition that takes into account the temperature, concentration, and liquid exchange cycle independently of the line speed.

Therefore, the process and conditions were set up to be suitable for mass production to lower the unit cost of the product, and the constant high quality can be maintained by setting the conditions according to the test of the final product. It is a useful technology that can reduce costs by preventing losses.

1 is a process chart showing the process of the electrochemical indirect etching method by a continuous automation system of aluminum sheet according to the present invention;

2 is a schematic diagram of a facility for implementing an electrochemical indirect etching method by a continuous automation system of aluminum sheet according to the present invention;

Figure 3 is a schematic diagram of the electrochemical indirect etching means used in the electrochemical indirect etching method by the continuous automation system of the aluminum sheet according to the present invention;

Figure 4 is a schematic diagram of the anodizing means used in the electrochemical indirect feeding method by a continuous automation system of aluminum sheet according to the present invention;

5 is an enlarged view of the surface of the aluminum plate treated by the electrochemical indirect etching method by the continuous automation system of the aluminum plate according to the present invention;

6 is a surface roughness of the aluminum sheet treated by the electrochemical indirect etching method by the continuous automation system of the aluminum sheet according to the present invention;

Figure 7 is a photograph showing the cross-cut test results of the planar portion of the product coated with fluorocarbon resin on the aluminum plate by the electrochemical indirect etching method by the continuous automation system of the aluminum plate according to the present invention;

Figure 8 is a photograph showing the cross-cut test results of the bent portion of the product coated with fluorocarbon resin on the aluminum plate by the electrochemical indirect etching method of the aluminum plate continuous automation system according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

DESCRIPTION OF SYMBOLS 1: Aluminum plate 2: Chemical cleaning tank 3: First flush tank 10: Cleaning means

4: roughness equalization tank 5: second water washing tank 20: active treatment means 13: hot water washing tank

6: electrochemical etching bath 7: third flush tank 30: electrochemical indirect etching means

8: Neutralization tank 9: Fourth washing tank 40: Neutralization treatment means 14: Dryer

11: Anodized film treatment tank 12: Fifth flush tank 50: Anodized film treatment means

Claims (7)

A washing step of spraying sulfuric acid (H ₂ SO ₄ ) solution to remove oils and fats adhered to the surface of the aluminum sheet 1 and then washing with water; An activation treatment step of injecting a sodium hydroxide (NaOH) solution onto the surface of the cleaned aluminum plate (1) to equalize the roughness of the surface and then washing with water; An electrochemical indirect etching step of electrochemically etching one surface of aluminum by supplying an indirect power supply while injecting hydrochloric acid (HCl) solution to the surface of the activated aluminum plate (1); A neutralization treatment step of spraying nitric acid (HNO ₃ ) solution on the surface roughness-formed aluminum sheet 1 to neutralize the fluorocarbon resin to improve adhesion to the fluorocarbon resin, and then flush with water; Anodizing the other side of aluminum by supplying an indirect power supply while injecting sulfuric acid (H ₂ SO ₄ ) solution to prevent oxidation by anodizing the other side of the neutralized aluminum plate 1 that is not indirectly etched. Forming an anodized film and then washing with water; The anodized aluminum plate (1) is immersed in hot water and washed, followed by a washing and drying step of removing the moisture and moisture present on the surface of the plate (1) continuous automation system Electrochemical indirect etching method. The method according to claim 1, In the cleaning step, a 10-30% sulfuric acid (H ₂ SO ₄ ) solution and a cleaning solution mixed with 5-100 ppm corrosion inhibitor are sprayed at a temperature of 60-80 ° C. to be attached to the surface of the aluminum sheet 1. And electrochemical indirect etching method by the continuous automation system of the aluminum sheet, characterized in that to remove foreign substances. The method according to claim 1, In the activation treatment step, the surface roughness is sprayed by spraying a cleaning solution mixed with a 2-15% sodium hydroxide (NaOH) solution and 5-100 ppm corrosion inhibitor on the surface of the cleaned aluminum plate 1 at a temperature of 60-80 ° C. Electrochemical indirect etching method by a continuous automation system of aluminum sheet, characterized in that to homogenize. The method according to claim 1, The electrochemical indirect etching step is a current of 10 ~ 40A / dm ² by the indirect power supply method while spraying 1 ~ 10% hydrochloric acid (HCl) solution at a temperature of 20 ~ 60 ℃ on the surface of the activated aluminum sheet (1) An electrochemical indirect etching method using a continuous automation system of an aluminum sheet, characterized in that the aluminum surface is electrochemically etched at a density. The method according to claim 1, The neutralization step is characterized in that the neutralized treatment by spraying a solution composition of 20 to 40% nitric acid (HNO ₃ ) solution and 5 to 100 ppm of corrosion inhibitor to the aluminum plate (1) having a surface roughness at room temperature. Electrochemical indirect etching method by continuous automation system of aluminum sheet. The method according to claim 1, The anodizing film treatment step is a 10 to 20% sulfuric acid (H ₂ SO ₄ ) solution and 5 ~ 100ppm of an acid to prevent oxidation by anodizing the other side of the neutralized aluminum plate (1) that is not indirect etching Aluminum, characterized in that to form an anodized film on the other side of the aluminum at a current density of 1 ~ 10A / dm ² by using an indirect power supply method while spraying a solution mixed with a corrosion inhibitor in the range of 10 ~ 30 ℃ Electrochemical indirect etching method by plate automation system. The method according to claim 1, In the cleaning and drying step, the electrochemical indirect by the continuous automation system of the aluminum plate, characterized in that the sealing and surface stains are removed through at least one hot water bath for dipping the anodized aluminum plate (1) in hot water. Etching method.