JP2632235B2 - Apparatus and method for continuous electrolytic treatment of aluminum product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an elongated aluminum or an alloy thereof,
A method for continuously electrolytically treating strip-shaped, linear, or foil-shaped products, and an apparatus used for the treatment, which solves various problems that occur during high-speed operation of a line or electrolytic treatment of a thick film product. The present invention relates to an electrolytic processing apparatus and method capable of performing the above.

[Conventional technology]

Conventionally, continuous electrolytic treatment of long aluminum or its alloy products (hereinafter abbreviated as aluminum products) includes anodizing treatment used in the production of lithographic printing supports, alumite wires, electrolytic capacitors, and other electrolytic processes. It has been put to practical use in a wide range such as coloring treatment, electrolytic polishing treatment, and electrolytic etching treatment.

Conventionally, an electrolytic treatment apparatus as shown in FIG. 3 has been widely used for continuous electrolytic treatment of aluminum products. For example, there is an electrolytic treatment method using a manufacturing apparatus described in JP-A-48-26638, JP-B-58-24517, and JP-A-47-18739. This method is an electrolytic treatment method in which power is supplied and treated by a so-called submerged power supply method. For example, in the anodic oxidation method using direct current using a conventional manufacturing apparatus, in FIG. 3, an aluminum product (1) to be processed runs from left to right in the drawing. The electrolytic treatment tank includes a power supply section (2) for negatively charging the aluminum product (1), an electrolytic section (4) and a power supply section (2) for electrolytically processing the negatively charged aluminum product (1). It consists of three parts of an intermediate part (3) provided to prevent a short circuit of the current in the liquid between the electrolytic part (4). In this case, the DC power supply (7
The currents from a) to (7d) flow from the power supply electrode (5) to the aluminum product (1) via the electrolytic solution at the power supply section (2), and the current flows on the aluminum product (1) through the electrolytic section (4). ), And the electrolytic electrodes (6a) to (6d) from the aluminum product (1) via the electrolytic solution in the electrolytic section (4).
Flows to Aluminum product (1) in this electrolysis part (4)
An anodic oxide film is formed on the surface of the substrate. According to this submerged power supply method, unlike the conventional direct power supply method, the object to be processed is not brought into contact with an electrode or the like. A high electrolytic processing line can be realized.

However, in this method, it is necessary to increase the supply current when increasing the speed of the electrolytic processing line to improve productivity or when increasing the amount of the anodic oxide film to improve the quality performance. Increasing the supply current increases the voltage drop due to ohmic loss in the aluminum product (1).
It is necessary to increase the electrolytic voltage of the power supply.

As described above, the amount of supplied electric power is increased, and as a result of the increase in the electrolytic voltage for reinforcing the voltage drop, the amount of supplied electric power is increased, leading to an increase in running cost and a need to increase the power supply capability. This leads to an increase in equipment costs. Furthermore, since the electrolysis voltage increases, the amount of Joule heat generated in the aluminum product (1) between the power supply electrode (5) and each of the electrolysis electrodes increases, and the aluminum product (1) and the electrolyte are kept in a steady state. Cooling costs for cooling to the prescribed temperature will also increase.

In the intermediate part (3) between the power supply part (2) and the electrolysis part (4), the entire current supplied into the aluminum product (1) flows, so that it is linear, foil-shaped or thin strip-shaped. If the cross section is small, heat is generated more than necessary, and the aluminum product (1) melts. For this reason, there is a limit to increasing the amount of supply current, and it has conventionally been difficult to speed up the processing of these objects.

In addition, as a post-process of the electrolytic treatment, for example, when there is a process using an organic solvent such as a coating process, in order to prevent the occurrence of explosion, ignition, and the like due to an increase in the potential of the aluminum product in these post-processes, Generally, the aluminum product after the electrolytic treatment step is grounded by means such as an earth roll (8) as shown in FIG.

However, in this method, the potential of the aluminum product at the rear of the electrolytic processing unit is maintained at substantially the ground potential, but the potential of the aluminum product at the front of the electrolytic processing unit is higher than that. For this reason, a current is generated from the electrolytic processing section, which passes through the aluminum product and flows forward of the line. This current causes various adverse effects such as corrosion of metal parts used for pipes and liquid feed pumps, occurrence of spark failure, and occurrence of electric leakage in various processing equipment that is performed as a pretreatment of the electrolytic processing equipment. I do.

Further, in order to prevent the occurrence of these adverse effects, it is necessary to use a non-corrosive material or use an insulating material, so that the equipment becomes complicated, and equipment costs and maintenance costs increase. Problems arise. In particular, when increasing the speed of the electrolytic processing line to improve productivity, or when increasing the amount of anodized film to improve quality performance, it is necessary to increase the supply current. The potential of these aluminum products becomes higher, and these problems become significant.

[Problems to be solved by the invention]

An object of the present invention is to solve these problems, greatly reduce running costs such as power costs and process costs for cooling, enable uniform and high-quality electrolytic processing, and control the processing amount. An object of the present invention is to provide an easy electrolytic treatment apparatus. It is another object of the present invention to provide a compact electrolytic processing method and apparatus capable of performing high-productivity electrolytic processing with low equipment costs and low maintenance costs. Another object of the present invention is to provide an electrolytic processing method and apparatus which can perform high-speed processing without fear of fusing of aluminum products, even in a small cross-sectional area such as a line, a foil, or a thin strip. To provide. Still another object of the present invention is that even if the electrolytic treatment is performed at a higher speed or a higher electrolytic amount, the production is stable, and there is no concern such as corrosion of metal parts in the pretreatment device, generation of sparks and electric leakage. An object of the present invention is to provide an electrolytic treatment method and apparatus.

[Means for solving the problem]

The above object of the present invention, in a device for continuous electrolytic treatment of a long aluminum or its alloy product using an electrolytic treatment device comprising at least an electrolytic part and a power supply part, corresponding to one electrolytic part , Two or more power supply parts are provided, and the power supply part is installed before and after along the longitudinal direction of the long product of the electrolytic part, and the first half electrode of the electrolytic part is connected to the electrode of the front power supply part via the power supply. However, this can be achieved by using an electrolytic processing apparatus characterized in that the latter half of the electrode of the electrolytic section is connected to the electrode of the rear feed section via a power supply.

Another aspect of the present invention is the above electrolytic treatment apparatus,
The potential difference between the long products before and after the processing device is detected, and the current value supplied to the front-side power supply unit and the rear-side power supply unit is controlled so that the potential difference becomes substantially zero. Processing method for controlling the sum of current values supplied to the power supply unit and the rear power supply unit to a constant value, and therefore, the electrolytic processing apparatus used in the processing method supplies the electric power to the front power supply unit and the rear power supply unit. This can be achieved by providing a control unit that enables the sum of the current values to be controlled to a constant value.

Further, as a preferred embodiment, a grounding means can be provided either before or after the electrolytic treatment apparatus. First
The figure shows an embodiment of the electrolytic processing apparatus for achieving the object of the present invention, that is, two power supply sections are provided corresponding to one electrolytic section, so that it is economical, and delicate electrolytic processing such as thin material processing is performed. FIG. 4 is a side view of an apparatus that enables processing.

In FIG. 1, an aluminum product (1) to be processed travels from left to right in the drawing. This electrolysis treatment apparatus is composed of five parts: a first power supply unit (2a), a first intermediate unit (3a), an electrolytic unit (4), a second intermediate unit (3b), and a second power supply unit (2b). ing. Among them, the middle part (3a),
(3b) may not be provided if it is not necessary.

In addition, two or more units may be used in the longitudinal direction by connecting the unit shown in this example to one unit.

The power supply units (2a) and (2b) and the electrolytic unit (4) are filled with an electrolytic solution. Typical examples of the electrolytic solution include aqueous solutions of sulfuric acid, phosphoric acid, oxalic acid, and salts thereof, and mixtures thereof, and an optimal solution may be selected to obtain desired quality. The concentration and temperature of the electrolyte can be freely selected. Further, the conditions of the electrolytes in the two power supply units and the electrolytic unit may be the same or different.

Power supply electrodes (5a) and (5b) for the power supply sections (2a) and (2b)
However, the electrolytic part (4) has electrolytic electrodes (6a), (6b),
(6a) and (6d) are provided respectively. In this embodiment, four DC power supplies (7a), (7b), (7c), and (7d) are provided, and the electrode (6) in the first half of the electrolytic section (4) is provided.
a) and (6b) are connected to the power supply electrode (5a) of the first power supply unit (2a) via the DC power supplies (7a) and (7b),
Electrodes (6c) and (6d) in the latter half of the electrolysis unit (4) are connected to the second power supply unit (2) via the DC power supplies (7c) and (7d).
It is connected to the power supply electrode (5b) of b). As a result, the current in the aluminum product (1) travels from left to right in the drawing for the first half and travels from right to left in the drawing for the second half.

In the power supplies (7a) and (7b), the current flowing through the power supply electrode is reduced by half, so that the voltage during electrolysis is reduced. In the power supplies (7c) and (7d), in addition to the above reasons, FIG. As can be seen from the comparison, the distance between the power supply electrode and the electrolytic electrode is reduced, so that the electrolytic voltage can be further reduced.

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

The number of power supplies is four, but any number of power supplies may be used as long as the number 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, the amount of electrolytic treatment on the surface of the aluminum product (1)
If it is necessary to make the amount of the predetermined amount, or if the first half and the second half of the electrolysis part as much as possible, and if the components of the electrolytic solution in the electrolytic tank to maintain uniformity, When it is necessary to change the supply current value per power supply, it is also possible to adopt a structure in which the supply current value can be controlled.

In many cases, the amount of electrolytic treatment is the same if the sum of the electrolytic current values in the electrolytic cell is equal. Therefore, as one preferred embodiment of the electrolytic treatment method, it is desirable that control can be performed so that the sum of the amounts of current supplied to the front power supply unit and the rear power supply unit in the electrolytic cell becomes constant.

Also, the combination of power supplies connected to the first power supply unit and the second power supply unit may have the same number of power supplies as in this case,
May be different. In general, making the sum of the current values applied to the first power supply unit equal to the sum of the current values applied to the second power supply unit is most effective in the present invention, but is not limited thereto.

FIG. 1 shows a case where electrodes are arranged on the same surface side of an aluminum product on both the power supply side and the electrolytic side, but electrodes are provided on the opposite surface or both surfaces of the aluminum product on one or both of them. You may.

In addition, even if the object of the present invention is to increase the production speed and increase the amount of electrolysis, which is another object of the present invention, it is possible to control the electrolytic treatment current so that the production is stable and the predetermined amount of electrolytic treatment can be treated uniformly and with good quality. FIG. 2 is a side view of one embodiment of an electrolytic processing apparatus capable of performing an electrolytic processing without concern about corrosion of metal parts, occurrence of a spark or leakage in the pretreatment apparatus.

In FIG. 2, an aluminum product (1) to be processed travels from left to right in the drawing. This electrolytic treatment tank is composed of five parts: a first power supply section (2a), a first intermediate section (3a), an electrolytic section (4), a second intermediate section (3b), and a second power supply section (2b). I have. Among them, the middle part (3a),
(3b) may not be provided if it is not necessary. Also,
The unit shown in this example may be used as one unit by connecting two or more units in the longitudinal direction.

The power supply units (2a) and (2b) and the electrolytic unit (4) are filled with an electrolytic solution. Typical examples of the electrolytic solution include aqueous solutions of sulfuric acid, phosphoric acid, oxalic acid, and salts thereof, and mixtures thereof, and an optimal solution may be selected to obtain desired quality. The concentration and temperature of the electrolyte can be freely selected. Further, the conditions of the electrolytes in the two power supply units and the electrolytic unit may be the same or different.

Power supply electrodes (5a) and (5b) for the power supply sections (2a) and (2b)
However, the electrolytic section (4) is provided with electrolytic electrodes (6a) and (6b). In this embodiment, two DC power supplies (7a) and (7b) are installed, and the electrode (6a) in the first half of the electrolysis unit (4) is connected to the power supply (7a) via the current power supply (7a). The second power supply unit (2b) is connected to the power supply electrode (5a) of one power supply unit (2a), and the second power supply unit (2b) is supplied to the second half electrode (6b) of the electrolytic unit (4) via the DC power supply (7b). It is connected to the electrode (5b). As a result, the current in the aluminum product (1) travels from left to right in the drawing for the first half,
In the latter half, the vehicle runs from right to left in the drawing.

Although the case of direct current is shown as the power supply waveform, an optimal waveform such as an alternating current waveform or an AC / DC superimposed waveform to obtain desired quality can be selected.

Although FIG. 2 shows the case where the number of power supplies is two, four power supplies as in the case of FIG. Also, the combination of power supplies connected to the first power supply unit and the second power supply unit may have the same number of power supplies as in this case, or may be different.

FIG. 2 shows a case where the electrodes are arranged on the same surface side of the aluminum product on both the power supply side and the electrolytic side, but the electrodes are arranged on the opposite surface or both surfaces of the aluminum product on one or both of them. You may.

An earth roll (8) is provided in a line behind the electrolytic treatment tank, and keeps the potential of the aluminum product (1) at the ground potential. 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 as follows:
The information is detected by the detection unit (9), and the information is sent to the control unit (10). The control unit (10) performs an operation based on the information from the detection unit (9), and controls the two DC power supplies (7a) so that the potential difference between the points A and B becomes substantially zero. , (7b) are controlled.

Generally, the amount of oxide film formed on the aluminum product (1) is determined by the sum of the current values supplied to the DC power supplies (7a) and (7b).
The sum of the current values supplied to a) and (7b) is desirably controlled by the control unit (10) so as to be a constant value. With this method, the potentials at the points A and B can be equalized, so that the potential of the aluminum product (1) is substantially maintained at the ground potential on both the front and rear sides of the electrolytic treatment tank.
The generation of current flowing from the electrolytic treatment tank through the aluminum product to another process can be prevented.

Still another preferred embodiment of the present invention is: (1) In the electrolytic treatment method according to claim 2, control is performed such that the sum of current values supplied to the front power supply unit and the rear power supply unit of the electrolytic unit is constant. An electrolytic treatment method comprising:

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

It is.

〔Example〕

Hereinafter, an example in which the electrolytic treatment method of the present invention can be specifically carried out will be described with reference to FIG. 1, but the concrete example is a description for deepening the understanding of the present invention. Not limited by

(Example-1) A strip-shaped long aluminum product (with an electrolytic device having a structure shown in Fig. 1 in which the length of the tank of the electrolytic section is 12m and the length of the first and second power supply sections is 5m) ( (0.2mm thick, 1000mm width) at a rate of 100m / min.
Anodizing treatment was performed at / dm ² to form an oxide film having a thickness of 2 μm. As the electrolytic solution, an aqueous solution of sulfuric acid was used for both the electrolytic part and the power supply part. The liquid concentration was 15 vol% and the liquid temperature was 25 ° C.
As a result, the electrolysis voltages at the power supplies (7a), (7b), (7c), and (7d) were 48 V, 52 V, 52 V, and 48 V, respectively, and the total power was 2500 kW. The total calorific value in the tank is 220
10,000 kcal / hr, the surface temperature of the aluminum product in the first and second intermediate parts was 50 ° C, and the treatment was performed stably even after a long time.

(Comparative Example 1) Anodizing treatment was performed using an electrolytic apparatus having a structure shown in FIG. 3 in which the length of the tank of the electrolysis section was 12 m and the length of the tank of the power supply section was 5 m, and an oxide film having a thickness of 2 μm was formed. I let it. Other conditions were the same as in the example.

As a result, the electrolysis voltages at the power supplies (7a), (7b), (7c), and (7d) were 70 V, 83 V, 92 V, and 98 V, respectively, and the total power was 4500 kW. The total calorific value in the tank is 38
0,000 kcal / hr, surface temperature of aluminum products in the middle part
The temperature was 90 ° C., and the aluminum product melted out within 2 minutes after the start of the treatment, and the treatment could not be continued.

〔The invention's effect〕

As is clear from the examples, according to the method of the present invention,
The desired electrolysis treatment can be performed at a lower electrolysis voltage than before, so that less power is required and the amount of heat generated during the process is reduced, so that the cooling load is reduced and the cost required for the process is drastically reduced. In addition, since it is not necessary to use a power supply having a large boosting capability, the power supply can be made compact and the equipment cost can be reduced.

Further, even in the case of an aluminum product having a small cross-sectional area, such as a linear, foil-like or thin strip-like product, a stable electrolytic treatment can be realized without fear of the aluminum product being blown.

Furthermore, according to the method of the present invention, it is possible to prevent the generation of electric current flowing from the electrolytic treatment tank through the aluminum product to other processes, so that corrosion of metal parts in the pretreatment device for electrolytic treatment, spark and electric leakage are prevented. Stable electrolysis treatment without concern of generation is realized. Since these problems do not occur, equipment costs and maintenance costs of the electrolytic treatment apparatus are reduced. Further, even if the production speed is increased and the amount of electrolysis is increased, stable electrolysis can be realized.

[Brief description of the drawings]

FIG. 1 is a side view conceptually showing an electrolytic treatment apparatus according to an embodiment in which a power supply section is installed before and after an electrolytic section along a longitudinal direction of a long product by the method of the present invention. FIG. 2 conceptually shows another embodiment of the electrolytic processing apparatus provided with a control means for controlling a current value to be supplied by the method of the present invention, and a grounding means provided either before or after the processing apparatus. FIG. FIG. 3 is a side view conceptually showing a conventional electrolytic processing apparatus, and FIG. 4 is a conceptual view showing an electrolytic processing apparatus of one embodiment in which a grounding means is provided after an electrolytic section of the conventional electrolytic processing apparatus. It is a side view shown in FIG. In each figure, 1: Aluminum product 2: Power supply section 2a: First power supply section, 2b: Second power supply section 3: Intermediate section 3a: First intermediate section, 3b: Second intermediate section 4: Electrolytic section 5, 5a, 5b: Power supply electrodes 6a, 6b, 6c, 6d: Electrolytic electrodes 7a, 7b, 7c, 7d: DC power supply 8: Earth roll, 9: Detection unit 10: Control unit A point and B point are positions where potential is measured.

Claims (3)

(57) [Claims] 1. An apparatus for continuously electrolytically treating a long aluminum or its alloy product using an electrolytic treatment apparatus comprising at least an electrolytic part and a power supply part. The above-described power supply unit is provided, and the power supply unit is installed before and after along the longitudinal direction of the long product of the electrolytic unit. The first electrode of the electrolytic unit is connected to the electrode of the front power supply unit via the power supply, and An electrolyzing apparatus, wherein the second half electrode of the unit is connected to the electrode of the rear feeding unit via a power supply. 2. In an electrolytic treatment in which a long aluminum or its alloy product is continuously performed by using an electrolytic treatment device comprising at least an electrolytic part and a power supply part, two or more products are provided corresponding to one electrolytic part. The power supply unit is provided, and the power supply unit is installed back and forth along the longitudinal direction of the long product of the electrolytic unit. The first half electrode of the electrolytic unit is connected to the electrode of the front power supply unit via the power supply, The second half of the electrode is connected to the electrode of the rear feeding section via the power supply, and further detects the potential difference between the long products before and after the electrolytic treatment apparatus, and the front side feeding so that the potential difference becomes substantially zero. An electrolytic treatment method comprising controlling a current value supplied to a unit and a rear power supply unit. 3. An electrolytic treatment apparatus comprising at least an electrolytic section and a power supply section for use in continuous electrolytic treatment of a long aluminum or alloy product thereof, wherein two or more power supply sections correspond to one electrolytic section. The power supply unit is installed back and forth along the longitudinal direction of the long product of the electrolytic unit, the first electrode of the electrolytic unit is connected to the electrode of the front power supply unit via the power supply, and the second half of the electrolytic unit The electrode is connected to the electrode of the power supply unit on the rear side via a power supply, and a detecting means for detecting a potential difference between a long product before and after the electrolytic treatment apparatus, and the potential difference is substantially zero, and Electrolysis characterized by comprising control means for controlling a current value supplied to the front power supply unit and the rear power supply unit such that a sum of current values supplied to the front power supply unit and the rear power supply unit becomes a constant value. Processing equipment.