JPH04176899A - Device and method for continuous electrolytic treating of aluminum product - Google Patents

Abstract

PURPOSE:To allow a uniform and good electrolytic treatment by providing >=2 power feed sections in correspondence to one electrolyzing section and controlling the current values to be supplied to the front and rear power feed sections so as to decrease the potential difference before and behind a long-sized product to zero. CONSTITUTION:The electrolytic treating device is constituted of five parts; the 1st power feed section 2a, a 1st intermediate section 3a, the electrolyzing section 4, a 2nd intermediate section 3b, and the 2nd power feed section. The potential difference between the aluminum product 1 (point A) on the front side and the aluminum product (point B) on the rear side is detected by a detecting section 9 and the information thereon is sent to a control section 10. The current values to be supplied to two units of DC power sources 7a, 7b are so controlled as to decrease the potential difference between the point A and the point B to substantially zero in the control section 10. The potential of the aluminum product is eventually maintained at a grounding potential on both the front and rear side of the electrolytic treating cell and the generation of the current flowing from the electrolytic treating cell through the aluminum product 1 to other stages is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for continuously electrolytically treating a long product made of aluminum or its alloy, such as a strip, a wire, or a foil. The present invention relates to an electrolytic treatment apparatus and method that can solve various problems that occur during high-speed operation of a line or during electrolytic treatment of products with direct coating thickness.

(Prior Art) Conventionally, long aluminum or aluminum alloy products (hereinafter referred to as
Abbreviated as aluminum product. ) continuous electrolytic treatment has been put to practical use in a wide range of applications, including anodizing, which is used in the manufacture of lithographic printing supports, alumite wires, and electrolytic capacitors, as well as electrolytic coloring, electrolytic polishing, and electrolytic etching. .

Conventionally, an electrolytic treatment apparatus as shown in FIG. 3 has been widely used for continuous electrolytic treatment of aluminum products. For example, Japanese Patent Publication No. 48-26638, Japanese Patent Publication No. 58-24517
No. 47-18739 and Japanese Patent Laid-Open No. 47-18739. This method is an electrolytic treatment method in which power is supplied and processed using a power supply method called a so-called submerged power supply method. For example, in a direct current anodic oxidation method using a conventional manufacturing apparatus, the aluminum product (1) to be treated runs from left to right on the V plane in FIG. 3. The electrolytic treatment tank includes a power feeding part (2) for negatively charging the aluminum product (1), an electrolysis part (4) and a power feeding part (2) for electrolytically treating the negatively charged aluminum product (1). It consists of three tanks in the middle part (3), which is provided to prevent short circuit of current in the liquid between the two tanks in the electrolytic part (4).

In this case, the current from the DC power sources (7a) and (7b) flows from the power supply electrode (5) to the aluminum product (1) via the electrolyte at the power supply part (2), and the current flows through the aluminum product (1). In the electrolytic section (4), the aluminum product (1) flows through the electrolytic solution to the electrolytic electrodes (6a) and (6b). An anodic oxide film is formed on the surface of the aluminum product (1) in this electrolysis section (4). According to this submerged power supply method, unlike the conventional direct power supply method, the object to be processed does not come into contact with electrodes, etc., so it is possible to prevent sparks and scratch failures during power supply, and improve stability. A high-quality electrolytic treatment line can be realized.

However, with this method, it is necessary to increase the amount of supplied current when increasing the speed of the electrolytic treatment line to improve productivity or when increasing the amount of anodized film to improve quality performance. When the amount of supplied current is increased, aluminum products (
1) The voltage drop due to ohmic losses increases, making it necessary to increase the electrolytic voltage of the power supply.

As a result of increasing the amount of supplied current and increasing the electrolytic voltage to compensate for the voltage drop, the amount of supplied power increases, leading to an increase in running costs, and
Since the power supply capacity also needs to be amplified, this also leads to an increase in equipment costs. Furthermore, as the electrolysis voltage increases, the amount of Joule heat generated within the aluminum product (1) between the power supply electrode (5) and each electrolytic electrode increases, causing the aluminum product (1) and the electrolyte to become unstable. The cooling cost for cooling down to the specified temperature will also increase.

In the intermediate part (3) between the power supply part (2) and the electrolytic part (4),
Since the entire current supplied to the aluminum product (1) flows through the aluminum product (1), products with a small cross-sectional area such as wires, foils, or thin strips will generate more heat than necessary, causing the aluminum product (1) to melt. happens.

For this reason, there is a limit to increasing the amount of supplied current.
Conventionally, it has been difficult to speed up the processing of these objects.

In addition, in cases where the post-electrolysis process involves a process that uses organic solvents such as a painting process, this is to prevent the occurrence of explosions, ignitions, etc. due to the high potential of aluminum products in these post-processes. - When fishing on a boat, the aluminum product after the electrolytic treatment process is grounded, for example, by means such as a ground roll (8) as shown in FIG.

However, in this method, the potential of the aluminum product on the rear side of the electrolytically treated section is maintained at almost the ground potential, but the potential of the aluminum product on the front side of the electrolytically treated section is higher than that. Therefore, a current is generated that flows from the electrolytic treatment section through the aluminum product and toward the front of the line. This current causes various problems such as corrosion of metal parts used in piping and liquid pumps, occurrence of spark failures, and occurrence of electrical leakage in various treatment equipment used as pretreatment for electrolytic treatment equipment. .

Furthermore, in order to prevent the occurrence of these adverse effects, it is necessary to use non-corrosive materials or insulating materials, which increases the complexity of equipment and increases equipment and maintenance costs. A problem arises. In particular, when increasing the speed of the electrolytic treatment line to improve productivity or increasing the amount of anodic oxide film to improve quality performance, it is necessary to increase the amount of supplied current. As the potential of aluminum products becomes higher, these problems become more pronounced.

[Problem to be solved by the invention: The purpose of the present invention is to solve these problems, to significantly reduce running costs such as power costs and cooling process costs, and to enable uniform and high-quality electrolytic treatment. It is an object of the present invention to provide an electrolytic treatment apparatus in which the amount of treatment can be easily controlled. Another object of the present invention is to provide an electrolytic treatment method and apparatus that can perform electrolytic treatment with low equipment costs, low maintenance costs, compact size, and high productivity.

Another object of the present invention is to provide an electrolytic treatment method and apparatus capable of processing aluminum products at high speed without worrying about melting of aluminum products, even for products with a small cross-sectional area such as wires, foils, or thin strips. Our goal is to provide the following. Still another object of the present invention is to ensure stable production even when electrolytic treatment is performed at high speed or in a high amount of electrolytic treatment, and to eliminate concerns such as corrosion of metal parts, generation of sparks, and electrical leakage in pretreatment equipment. An object of the present invention is to provide an electrolytic treatment method and apparatus.

[Means to solve the problem]

The above object of the present invention is to provide an apparatus for continuously electrolytically treating long aluminum or aluminum alloy products using an electrolytic treatment apparatus comprising at least an electrolytic section and a power supply section.
Two or more power feeding parts are provided corresponding to one electrolytic part, and the power feeding parts are installed in front and back along the longitudinal direction of the long product of the electrolytic part, and the electrodes in the first half of the electrolytic part are connected to each other through the power supply. This can be achieved using an electrolytic treatment apparatus characterized in that the electrodes of the front power supply section are connected to the electrodes of the power supply section on the front side, and the electrodes of the latter half of the electrolytic section are connected to the electrodes of the rear power supply section via a power source.

Another aspect of the present invention is that in the electrolytic treatment apparatus described above, a potential difference between the long products before and after the treatment apparatus is detected, and the potential difference is supplied to the front power supply section and the rear power supply section so that the potential difference becomes substantially zero. An electrolytic treatment method that controls the current value and, if necessary, makes it possible to control the sum of the current values supplied to the front power feeding section and the rear power feeding section to a constant value, and therefore an electrolytic treatment device used in the above treatment method. This can be achieved by including a control means that can control the sum of the current values supplied to the front power feeding section and the rear power feeding section to a constant value.

Furthermore, as a preferred embodiment, grounding means can be provided either at the front or rear of the electrolytic treatment apparatus. 1st
The figure shows one embodiment of an electrolytic treatment apparatus for achieving the purpose of the present invention, in which two power supply parts are provided corresponding to one electrolytic part, and it is economical and can be used for delicate electrolysis such as processing of thin materials. FIG. 2 is a side view of a device allowing processing;

In Figure 1, an aluminum product (1
) runs from left to right in the drawing.

This electrolytic treatment equipment is composed of five tanks: a first power feeding part (2a), a first intermediate part (3a), an electrolytic part (4), a second intermediate part (3b), and a second power feeding part (2b). ing. Among these, the intermediate portions (3a) and (3b) may not be provided if unnecessary.

Further, in this example, the power supply part and the electrolytic part are each independent tanks, but a method may be adopted in which a suitable partition plate or the like is provided in one tank to separate each part. Further, the portion shown in this example may be used as one unit, and two or more units may be connected in the longitudinal direction.

The power feeding sections (2a), (2b) and the electrolytic section (4) are filled with an electrolytic solution. Typical electrolytic solutions include aqueous solutions of sulfuric acid, phosphoric acid, oxalic acid, or their salts, or mixtures thereof, and the most suitable one may be selected to obtain the desired quality. The concentration and temperature of the electrolyte can also be freely selected.

Further, the conditions of the electrolyte in the two power feeding sections and the electrolytic section may be the same or different.

The power feeding parts (2a), (2b) have power feeding part electrodes (5a), (
5b), but the electrolytic part (4) also has an electrolytic electrode (6a
), (6b), (6a), and (6d) are provided, respectively. In this embodiment, the DC power supplies are (7a), (7
There are four units installed: b), (7c), and (7d), and the electrodes (6a) and (6b) in the first half of the electrolytic section (4) are connected via the DC power supply (7a) and (7b). , the second power supply section (
The electrodes (6c) and (6d) in the latter half of the electrolytic part (4) are connected to the power supply electrode (5a) of 2a), and the electrodes (6c) and (6d) in the latter half of the electrolytic part (4) are connected to the second power supply part through the DC power supply (7c) and (7d). (2b) is connected to the power supply electrode (5a).

From this point on, the current in the aluminum product (1) will run from left to right in the drawing in the first half, and from right to left in the latter half.

In power supplies 1 (7a) and (7b), the current flowing through the feeding electrode is halved, so the voltage during electrolysis is reduced, and in power supplies (7C) and (τd), in addition to the above reasons, the third As can be seen from the comparison with the figure, the distance between the power supply electrode and the electrolytic electrode is shortened, so the electrolytic voltage can be lowered even further.

Although the case of DC power supply waveform is shown, the most suitable one can be selected to obtain the desired quality, such as AC waveform or AC/DC waveform.

Although the case where four power supplies are used is shown, any number of power supplies may be used as long as it is two or more. Further, the supply current value per power supply may be all the same, or, for example, the current density may be gradually increased.

In particular, when it is necessary to make the amount of electrolytic treatment on the surface of an aluminum product (1) a predetermined amount, or to make the amount of electrolysis in the first and second half of the electrolytic part as equal as possible, When it is necessary to change the supply current value per power supply unit, such as when maintaining the uniformity of the components of the electrolytic solution, it is also possible to create a structure in which the supply current value can be controlled.

In most cases, the amount of electrolytic treatment is the same if the sum of the electrolytic current values in the electrolytic cell is the same.

Therefore, as a preferable aspect of the electrolytic treatment method, it is desirable to be able to control the sum of the amounts of current supplied to the front power supply section and the rear power supply section within the electrolytic cell to be constant.

Further, the combination of power supplies connected to the first power supply section and the second power supply section may have the same number of power supplies as in this case, or may have different numbers. In general, the effects of the present invention are best achieved by making the sum of the current values supplied to the first power supply section equal to the sum of the current values supplied to the second power supply section. It is not limited to this.

Figure 1 shows the case where the electrodes are placed on the same side of the aluminum product on both the power supply side and the electrolysis side, but it is also possible to place the electrodes on the opposite side or both sides of the aluminum product on one or both of them. You can.

Another objective of the present invention is to make it possible to control the electrolytic treatment current so that the production is stable and the predetermined amount of electrolytic treatment can be processed uniformly and with good quality even if the manufacturing speed is increased and the amount of electrolyzed material is increased. Furthermore, FIG. 2 shows a side view of an embodiment of an electrolytic treatment apparatus capable of carrying out electrolytic treatment without concerns such as corrosion of metal parts, generation of sparks, or electrical leakage in the pretreatment apparatus.

In Figure 2, the aluminum product (1
) runs from left to right in the drawing.

This electrolytic treatment tank includes a first power feeding section (2a), a first intermediate section (3
It consists of five tanks: a), an electrolytic section (4), a second intermediate section (3b), and a second power feeding section (2b). Among these, the intermediate portions (3a) and (3b) may not be provided if unnecessary. Further, the portion shown in this example may be used as a unit by connecting two or more units in the longitudinal direction.

The power feeding sections (2a), (2b) and the electrolytic section (4) are filled with an electrolytic solution. Typical electrolytic solutions include aqueous solutions of sulfuric acid, phosphoric acid, oxalic acid, or their salts, or mixtures thereof, and the most suitable one may be selected to obtain the desired quality. The concentration and temperature of the electrolyte can also be freely selected. Further, the conditions of the electrolyte in the two power feeding sections and the electrolytic section may be the same or different.

The power supply parts (2a) and (2b) have power supply electrodes (5a) and (5
b), and the electrolytic cell (4) also has an electrolytic electrode (6a),
(6b) are provided respectively.

In this embodiment, the DC power supplies are (7a) and (7b).
There are two electrodes installed in the front half of the electrolytic cell (4).
6a) is connected to the power supply electrode (5a) of the second power supply part (2a) via the DC power supply (7a), and is connected to the power supply electrode (5a) of the second power supply part (2a), and
Regarding the electrode (6b) in the latter half of 4), the DC power supply (7
b) via the power supply electrode (5b) of the second power supply unit (2b);
is connected to. As a result, aluminum products (1)
In the first half, the current runs from left to right in the drawing, and in the second half, it runs from right to left in the drawing.

Although the case of DC power supply waveform is shown, the most suitable one can be selected to obtain the desired quality, such as AC waveform or AC/DC superimposed waveform.

Figure 2 shows the case where the number of power supplies is two, but
As in the case shown in the figure, there is no problem even with four devices, and any number of devices may be used as long as it is one or more. Further, the combination of power supplies connected to the first power supply section and the second power supply section may have the same number of power supplies as in this case, or may have different numbers of power supplies.

Figure 2 shows a case where the electrodes are placed on the same side of the aluminum product on both the power supply side and the electrolysis side, but it is also possible to place the electrodes on the opposite side or both sides of the aluminum product on one or both of them. You can.

A ground roll (8) is installed on the line behind the electrolytic treatment tank.
is provided to maintain the potential of the aluminum product (1) at ground potential. In addition, the potential difference between the aluminum product (1) (point A) on the front side of the electrolytic treatment tank and the aluminum product (1) (point B) on the rear side of the electrolytic treatment tank is detected by the detection part (9). The information is sent to the control section (10).

The control unit (10) performs calculations based on the information from the detection unit (9), and connects the two DC power supplies (7a) so that the potential difference between point A and point B becomes substantially zero. , (7b) are controlled.

In addition, when boat fishing, the amount of oxide film generated on the aluminum product (1) is determined by the sum of the current values supplied to the DC power supplies (7a) and (7b), so the amount of oxide film generated on the aluminum product (1) is
It is desirable that the sum of the current values supplied to 7a) and 7b is controlled by the control section (10) so that it becomes a constant value. This method makes it possible to equalize the potentials at points A and B, so the potential of the aluminum product (1) is maintained at ground potential on both the front and rear sides of the electrolytic treatment tank, and the aluminum product (1) is transferred from the electrolytic treatment tank to the ground potential. It is possible to prevent the generation of current flowing through it to other processes.

Still other preferred embodiments of the present invention include: (1) In the electrolytic treatment method according to claim 2, the sum of the current values supplied to the front power supply part and the rear power supply part of the electrolysis section is controlled to be constant. An electrolytic treatment method characterized by:

(2) The electrolytic treatment apparatus according to claim 3, characterized in that a grounding means is installed on at least one of the front side and the rear side of the electrolytic treatment apparatus along the longitudinal direction of the long product passing through the electrolytic treatment apparatus. Electrolytic treatment equipment.

It is.

〔Example〕

Examples in which the electrolytic treatment method of the present invention can be concretely implemented will be described below with reference to FIG. It is not limited by.

(Example 1) An electrolytic device having the structure shown in FIG. 1, in which the length of the tank in the electrolysis section is 12 m and the length of the tanks in the first and second power feeding parts is 5 m, was used to produce a long aluminum product in the form of a strip ( Thickness 0.2mm, width 10
0100O was conveyed through an electrolytic treatment line at a conveyance speed of 100 m/min, and anodized at a current density of 50 A/dm to produce an oxide film with a thickness of 2 μm.The electrolyte was a sulfuric acid aqueous solution for both the electrolytic part and the power supply part. was used, and the liquid concentration was 15
The volume was 1%, and the liquid temperature was 25°C. As a result, the electrolytic voltages at power supplies (7a), (7b), (7c), and (7d) are 48V, 52V, 52V, and 48V, respectively.
The total power was 2500kW. In addition, the total calorific value in the tank was 2.2 million kcal/hr, and the surface temperature of the aluminum products in the first and second intermediate tanks was 50°C, which ensured stable processing even after a long period of time. .

(Comparative Example-1) An anodizing process was carried out using an electrolytic apparatus having the structure shown in Fig. 1, in which the length of the tank in the electrolytic part was 12 m, and the length of the tanks in the first and second power supply parts was 5 m, and the film thickness was 2 μm. An oxide film was formed. Other conditions were the same as in the example.

As a result, power supplies (7a), (7b), (7c), (7d
) are 70V, 83■, 92V, respectively.
The voltage was 98V, and the total power was 4500kW. In addition, the total calorific value in the tank is 3.8 million kcal/hr, and the surface temperature of the aluminum product in the middle part is 90°C (
The aluminum product melted within two minutes after starting the process, making it impossible to continue the process.

〔Effect of the invention〕

As is clear from the examples, according to the method of the present invention, the desired electrolytic treatment can be performed at a lower electrolytic voltage than conventional methods, so less power is required and the amount of heat generated during the process is reduced. The cooling load is reduced, and the cost required for the process is drastically reduced.

Further, since there is no need to use a power source with a large boosting capacity for the power supply voltage, the power supply equipment can be made compact and require low equipment costs.

Furthermore, even in the case of aluminum products with a small cross-sectional area, such as wire-like, foil-like, or thin strip-like products, stable electrolytic treatment can be achieved without fear of the aluminum product breaking.

Furthermore, according to the method of the present invention, it is possible to prevent the generation of current flowing from the electrolytic treatment tank through the aluminum products to other processes, thereby preventing corrosion of metal parts, sparks, and electrical leakage in the pretreatment equipment for electrolytic treatment. Stable electrolytic treatment without concerns about generation etc. is realized. Since these problems do not occur, equipment costs and maintenance costs for the electrolytic treatment apparatus are reduced.

Furthermore, even if the manufacturing speed is increased or the amount of electrolysis is increased, stable electrolytic treatment can be achieved.

[Brief explanation of drawings]

FIG. 1 is a side view conceptually showing an electrolytic treatment apparatus according to an embodiment of the present invention, in which power feeding sections are installed before and after an electrolytic section along the longitudinal direction of a long product. FIG. 2 conceptually shows another embodiment of an electrolytic treatment apparatus, which is equipped with a control means for controlling the value of supplied current according to the method of the present invention, and is provided with grounding means on either the front or the rear of the treatment apparatus. FIG. Figure 3 is a conceptual side view of a conventional electrolytic treatment apparatus, and Figure 4 is a conceptual side view of an embodiment of an electrolytic treatment apparatus in which a grounding means is provided after the electrolysis section of the conventional electrolytic treatment apparatus. FIG. In each figure, 1 aluminum product 2: power feeding part 2a: first power feeding part 2b = second power feeding part 3: intermediate part 3a: first intermediate part 3b = second intermediate part 4: electrolytic part 5.5a, 5b: Power supply electrodes 6a, 6b, 6c, 6d: Electrolytic electrodes 7a, 7b, 7c, 7d: DC power supply 8: Earth roll 9; Detection section 10: Control section Point A and point B are the positions where potential is measured (3 idiots) Figure 3 Figure 4 Procedural amendment January 78, 1991

Claims (3)

[Claims] (1) In an apparatus that continuously electrolytically treats long aluminum or aluminum alloy products using an electrolytic treatment device that consists of at least an electrolytic section and a power supply section, two or more A power feeding part is provided, the power feeding part is installed in front and back along the longitudinal direction of the long product of the electrolytic part, and the electrode in the first half of the electrolytic part is connected to the electrode of the front power feeding part via a power supply,
An electrolytic treatment apparatus characterized in that the electrode in the latter half of the electrolytic section is connected to the electrode of the rear power feeding section via a power source. (2) In electrolytic treatment of long aluminum or aluminum alloy products continuously using an electrolytic treatment device consisting of at least an electrolytic section and a power supply section, two or more power supplies are provided corresponding to one electrolytic section. The power feeding parts are installed in front and back along the longitudinal direction of the long product in the electrolytic part, and the electrodes in the first half of the electrolytic part are connected to the electrodes in the front power feeding part via the power supply, and the electrodes in the second half of the electrolytic part are The electrodes are connected to the electrodes of the rear power supply section via a power supply, and the potential difference between the long products before and after the electrolytic treatment equipment is detected, and the front power supply section and An electrolytic treatment method characterized by controlling a current value supplied to a rear power feeding section. (3) In an electrolytic treatment device that is used for continuous electrolytic treatment of long aluminum or aluminum alloy products and is composed of at least an electrolytic section and a power feeding section, two or more power feeding sections are provided corresponding to one electrolytic section. , the power feeding parts are installed back and forth along the longitudinal direction of the long product in the electrolytic part, the electrodes in the first half of the electrolytic part are connected to the electrodes in the front power feeding part via the power supply, and the electrodes in the second half of the electrolytic part are Connect to the electrode of the rear power supply part via the power supply,
In addition, a detection means for detecting the potential difference between the long product before and after the electrolytic treatment device is provided, and the potential difference is substantially zero, and the sum of the current values supplied to the front power supply section and the rear power supply section is constant. 1. An electrolytic treatment apparatus comprising: a control means for controlling a current value supplied to the front power supply section and the rear power supply section so that the current value is the same as that of the front power supply section and the rear power supply section.