JPH05171495A - Vertical jet plating device - Google Patents

Abstract

PURPOSE:To eliminate a defective product by providing an electrolyte feed nozzle to the vertical jet plating device and a pressure equalizing chamber, an electrode box and a waste liq. box to an electrode and furnishing a sealing device for preventing the outflow of electrolyte. CONSTITUTION:A metallic strip is traveled between the electrodes opposed at a specified interval in the vertical jet electroplating device, and a nozzle for supplying an electrolyte between the electrodes and a side seal are provided on both ends of the electrode in the cross direction. Pressure equalizing chambers 7 band 7', an electrode box 13 pierced with many through-holes and a waste liq. box 12 for the electrolyte from between the electrodes are provided on the rear of the electrode, and a sealing device for preventing the outflow of electrolyte is furnished at the lowermost part of the device. Consequently, a strip is not vibrated, and a product, which is not bent or wrinkled, is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical jet plating apparatus for electrolytically plating tin, chromium or the like on the surface of a metal strip.

[0002]

2. Description of the Related Art A number of techniques have been disclosed for performing electrolytic plating at a high current density in a vertical electrolytic plating apparatus for electrolytically plating a strip. For example, Tokuhei 3
In JP-A-35395, as shown in FIG. 9, a method is proposed in which an electrolytic solution is supplied between the strip 2 and the electrode 18 to give a stirring effect between the strip and the electrolytic solution to obtain a high current density. ..

[0003]

In order to carry out electrolytic plating at a high current density in an electrolytic plating apparatus, metal ions are efficiently supplied to the plating interface, and a large amount of gas generated by high current density electrolysis is rapidly fed to the electrode. It needs to be removed from the gap. However, the electrolytic plating apparatus proposed in the prior art has the following problems.

(1) In the liquid supply nozzle portion for supplying the electrolytic solution to the electrodes, the inter-electrode portion, etc., pressure fluctuations occur and the strip comes into contact with the electrodes (short circuit) or the strip vibrates (flutters). Defects and breakage occur. In particular, the influence is remarkable when the strip is thin and has a thickness of 0.25 mm or less. (2) In the above (1), when the traveling speed of the strip becomes high, the gas generated by the electrolytic plating is dragged by the strip, and the gas does not escape from the electrode portion, resulting in defective plating.

(3) Since the flow of the electrolytic solution is nonuniform in the strip width direction, the plating thickness and the plating quality are nonuniform. The present invention has been proposed in order to solve the problems of the prior art, and its main purpose is to improve the flow rate of the electrolyte solution in the electrode in order to improve the quality and efficiency of plating. The vibration of the strip (flapping phenomenon) is minimized so that the flow velocity in the front and back surfaces of the strip and in the width direction can be made uniform, the current density can be increased, and the power consumption can be minimized. It is to provide a vertical jet plating device capable of preventing the above.

[0006]

Means for Solving the Problems The gist of the present invention for solving the above problems is as follows. (1) In a vertical jet plating apparatus for performing electrolytic plating by running a strip between electrodes arranged facing each other with a predetermined gap, a liquid supply nozzle for supplying an electrolytic solution between electrodes and an electrode width direction. The side seals are provided at both ends of the electrode, the pressure equalizing chamber is provided on the back side of the electrode, and the electrode box is provided with a large number of through holes for conducting to the pressure equalizing chamber. A vertical jet plating apparatus comprising a drainage device having a drainage box for accumulating and discharging the liquid, and a seal device provided at the bottom of the vertical jet plating device for preventing the outflow of the electrolytic solution. ..

(2) The liquid supply nozzle provided on the upper part or the lower part of the electrode box is divided into at least two or more nozzle chambers by partition walls, and liquid supply ports are provided on both sides of the primary nozzle chamber. The vertical jet plating apparatus according to item 1, wherein the partition wall is provided with a slit having a gap that gradually increases from the center to both sides. (3) A drainage box provided on the upper or lower part of the electrode box, a drainage port, a partition wall surrounding the strip provided inside the drainage box, and a drainage device having a large number of through holes in the partition wall. The vertical jet plating apparatus according to item 1 above, which is provided.

(4) Pressure equalizing chambers provided on the back side of the electrodes,
The vertical jet plating apparatus according to the above item 1, further comprising a conducting portion that conducts with each of the pressure equalizing chambers. (5) The vertical jet plating apparatus according to item 1, wherein a pressure equalizing chamber electrolytic solution supply device for supplying a small amount of electrolytic solution is provided in each pressure equalizing chamber provided on the back side of the electrode.

[0009]

Since the present invention is composed of the liquid supply nozzle, the electrode box, the drainage device, and the lower sealing device as described above, the circulation of the electrolytic solution can be performed with respect to one set of vertical jet plating devices. Since it can be controlled independently, it is easy to control the flow rate of each vertical jet plating device, and as shown in Japanese Patent Publication No. 3-35393 of the prior art, the one in which the rotary seal is provided on the lower drain side adjusts the amount of drainage. It was very difficult to obtain an appropriate flow velocity and flow velocity distribution, but by providing a drainage device as in the present invention, it becomes easy to adjust the drainage amount and obtain an appropriate flow velocity and flow velocity distribution. I was able to do it.

Further, since the sealing device is provided in the lower part of the drainage device and the lower part of the liquid supply nozzle, there is no leakage of the electrolytic solution, the flow velocity distribution is non-uniform due to the leakage of the electrolytic solution, and the amount of the electrolytic solution into the liquid receiving tank. Can be significantly reduced. Then, the electrode box is provided with side seals at both ends in the electrode width direction, and a pressure equalizing chamber is provided on the back side of the electrode,
A large number of through holes are provided in the electrode for conduction to the pressure equalizing chamber, and a conducting portion is provided for conducting to each of the pressure equalizing chambers, so that vibration of the strip (flapping) and adsorption of the strip to the electrode are prevented. I can do it.

The present inventors have conducted the following experiments and confirmed that this strip can prevent vibration (flapping phenomenon) and adsorption phenomenon to the electrode. In the experiment, the electrode was arranged opposite to the strip, water was blown into the electrode, and the fluctuation of the hydraulic pressure in the electrode and the amplitude of the strip were measured.

[0012]

[Table 1]

From the above experiment, when there is no hole in the electrode (Test No. 1), the pressure fluctuation value in the electrode is large and the amplitude of the strip is also large. On the other hand, when the electrode was perforated and a pressure equalizing chamber was provided (Test No. 2), it was found that the amplitude of the strip was extremely small. That is, the test No.
In No. 1, the pressure fluctuation in the electrode acts on the strip to give vibration. On the other hand, the test No. In No. 2, the pressure fluctuation value is greatly attenuated, and the amplitude of the strip is extremely small. In this way, by providing a large number of through holes in the electrode and conducting the pressure equalizing chamber, it was possible to disperse the pressure fluctuation in the electrode to the pressure equalizing chamber side.

Next, regarding the phenomenon of adsorption of the strip to the electrode, in addition to the vibration of the strip,
If the front surface of the strip is the chamber A and the back surface is the chamber B, it occurs when the pressure difference between the chamber pressure (PA) and the chamber pressure (PB) occurs. For example, when PA> PB, the strip moves to the B room side. From the above viewpoints, as a method of reducing the fluctuating pressure in the electrode and reducing the pressure difference between the front and back of the electrode, the conducting portion for conducting the pressure equalizing chambers provided on the back surface of the electrode is provided.

Next, the liquid supply nozzle is divided into at least two or more nozzle chambers by partition walls, liquid supply ports are provided on both sides of the primary nozzle chamber, and the partition walls between the nozzle chambers are arranged from the center to both sides. Since a slit with a gradually increasing gap is provided,
The turbulent flow of the electrolytic solution is rectified, and the flow rate of the electrolytic solution can be made uniform not only in the width direction of the strip but also on the front and back of the strip.
The plating thickness and plating quality can be made uniform. further,
Since a drainage box provided above or below the electrode box, a drainage port, a partition wall surrounding the strip provided inside the drainage box, and a drainage device having a large number of through holes in the partition wall are provided. It is possible to make the drainage flow velocity uniform not only in the width direction of the strip but also on the front and back of the strip.

Since a large number of through holes are provided in the partition wall as described for the electrode box, the strip vibration (flapping) and the adsorption phenomenon of the strip to the electrode can be prevented even in the drainage device. became. Further, since the pressure equalizing chamber electrolytic solution supply device for supplying a small amount of electrolytic solution is provided in the pressure equalizing chambers respectively provided on the electrode back side of the electrode box, it is possible that the pressure fluctuation in the pressure equalizing chamber is further reduced. It was confirmed by the experiment of the person. Then, it became possible to successively replace the electrolytic solution in the pressure equalizing chamber with a new electrolytic solution.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Needless to say, the present invention is not limited to this embodiment. (1) As shown in FIGS. 1, 2 and 3, the strip 2 is energized to the cathode by the conductor rolls 3 and 3'and runs in the direction of the solid arrow. Liquid supply nozzle 4, 4 '
Is arranged on the outlet side of the strip 2 in the longitudinal direction of the electrodes 5 and 5'to supply the electrolytic solution. Pressure equalizing chambers 7 and 7'are provided on the back side of the electrodes 5 and 5 ', and a large number of through holes are provided toward the pressure equalizing chambers 7 and 7', and the pressure equalizing chambers 7 and 7'are connected to the chamber A. Conduct electrical connection with room B.

The size of the through hole of the electrode is 1 to 10 times the distance (h) between the electrode surface and the center of the strip, and the total area of the electrode hole is about 5 to 10% of the total area of the electrode. Appropriate. The hole pitch was 5 to 20 times the distance (h) between the electrode surface and the strip center, and the distance (h) between the electrode surface and the strip center was 15 mm. The distance between the electrodes is 30 mm, which is twice the distance (2 h).

The depth distance (b) of the pressure equalizing chambers 7 and 7'is 20.
˜60 mm, which is about 2 to 4 times the distance (h) between the electrode surface and the center of the strip. Furthermore, the pressure equalizing chamber 7,
The chambers A and B of 7'are provided with conducting portions D on both sides of a pair of electrodes. Note that, in FIG. 3, the conducting portion is housed in the same box as the pressure equalizing chamber, but the conducting portion may be connected by a pipe or the like.

The side seals 6 are provided at both ends in the electrode width direction and are divided into the electrodes 5 and 5'and the pressure equalizing chambers 7 and 7 '. Vent holes 10 are provided above the pressure equalizing chambers 7 and 7'to allow the gas in the pressure equalizing chambers to be released to the atmosphere. The upper drainage device 8 is provided above the electrode 5, and the lower drainage device 8'is provided below the electrode 5 ', and these drainage devices face the strip and have a partition wall (8- It is divided by 1, 8'-1).

The sealing devices 9 and 9'are provided below the liquid supply nozzle 4 and the lower drainage device 8 ', and are composed of a rotatable dam roll 9-1 for sandwiching the strip 1 and a sealing plate 9-2. Has been done. Although the combination of the dam roll 9-1 and the seal plate 9-2 is proposed in the embodiment,
For example, a rubber-like seal plate may be directly pressed against the strip (not shown) as long as the electrolyte solution can be stored.

(2) Because of the relationship between the flow direction of the electrolytic solution and the traveling direction of the strip, when the electrolytic solution is caused to flow in the direction opposite to the traveling direction of the strip, there is an action of stirring the surface of the strip with the electrolytic solution. When the electrolytic solution is caused to flow in the same direction as the direction of travel of the strip, the gas generated by electrolysis is not restricted by the progress of the strip and has the effect of facilitating discharge.

Therefore, in the above embodiment, the strip 2
1 is indicated by the solid line arrow in FIG. 1, and the electrolytic solution is caused to flow in the direction opposite to the strip advancing direction. However, in terms of operating conditions, device configuration, electrolytic solution supply and drain pipe arrangement, etc. Under various conditions, the flow of the electrolytic solution may be the same as the strip advancing direction as shown by the broken line arrow in FIG. 1, and the flow of the electrolytic solution may be strip advancing as shown in FIGS. 7 and 8. A combination of both the direction opposite to the direction and the same direction as the strip advancing direction may be adopted.

Regarding FIGS. 7 and 8, first, FIG.
In FIG. 8, the liquid supply nozzles 4, 4'are arranged only under the electrodes, and in FIG. 8, the liquid supply nozzles 4, 4'are arranged only over the electrodes. (3) As shown in FIGS. 4 and 5, the electrolytic solution is introduced into the liquid supply port 4-1 from the liquid supply pipe. The liquid supply nozzles 4 and 4 are divided into a primary nozzle chamber 4-2 and a secondary nozzle chamber 4-3, and a partition wall 4
Separated by -4. Further, the flow path of the partition wall 4-4 is tapered so that the nozzle center (4-5) is narrower than the end portion (4-6). Suitably, the slit has a size of about 10 mm at the central portion (4-5) and about 30 mm at the end portion (4-6). The electrolytic solution is supplied to the electrodes 5 and 5 through the jet holes 4-7.

By applying the liquid supply nozzle of the present invention, it can be seen that the flow velocity distribution of the electrolytic solution with respect to the strip width is significantly improved as compared with the conventional method as shown in FIG. (4) Reference numeral 23 in FIG. 1 is a pressure equalizing chamber electrolytic solution supply device for supplying a small amount of electrolytic solution to the pressure equalizing chamber. Supply to each pressure equalizing chamber.

[0026]

Although the embodiments have been described above, the present invention has the following effects. First, in a vertical jet plating apparatus that forcibly supplies a plating solution into a narrow electrode, it is possible to eliminate vibration of the strip and obtain a product that is free from breakage or wrinkles. In particular, when running a thin size such as a strip thickness of 0.25 mm or less, the effect is great.

Secondly, it becomes possible to obtain a high flow velocity in the electrode, and as the current density increases, highly efficient plating can be performed and the number of plating devices can be greatly reduced.
Thirdly, since the problems of vibration of the strip (fluttering) and sticking to the electrodes can be solved, the distance between the electrodes can be narrowed from about 100 mm to 20 to 40 mm, and the flow rate of the electrolytic solution supplied between the electrodes can be reduced. At the same time, it is possible to reduce the plating power due to the narrow distance between the electrodes.

Fourth, since the flow rate of the electrolytic solution becomes uniform in the electrode, the plating thickness and plating quality can be made uniform.

[Brief description of drawings]

FIG. 1 is a side vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a vertical sectional view of a liquid supply nozzle of the present invention.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a diagram showing the relationship between strip width and flow velocity.

FIG. 7 is a side vertical cross-sectional view showing an embodiment in which the liquid supply nozzle is provided only on the lower part of the electrode.

FIG. 8 is a vertical sectional side view showing an embodiment in which the liquid supply nozzle is provided only on the upper part of the electrode.

FIG. 9 is a vertical sectional side view of a conventional plating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid receiving tank 2 Strip 3, 3'conductor roll 4, 4 'Liquid supply nozzle 4-1 Liquid supply port 4-2 Primary nozzle chamber of liquid supply nozzle 4-3 Secondary nozzle chamber of liquid supply nozzle 4-4 Partition wall of liquid supply nozzle 4-5 Central slit 4-6 End slit 4-7 Jet port of liquid supply nozzle 5, 5'electrode 6, 6'side seal 7, 7'pressure equalizing chamber 8 upper drainage device 8 ′ Lower drainage device 8-1 Partition wall of upper drainage device 8′-1 Partition wall of lower drainage device 9, 9 ′ Seal device 9-1 Dam roll of sealing device 9-2 Seal plate of sealing device 10 Vent hole 11 Partition wall Through hole 12 Drain box 13 Electrode box 14 Drain port 15 Liquid feed port 16 Liquid feed pipe 17 Liquid feed nozzle 18 Electrode 19 Dam roll 20 Connector 21 Rotation seal 22 Lip 23 Equal pressure chamber Electrolyte supply device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Masuda 59 Nippon Steel Plant Design Co., Ltd., Nakahara 46, Tobata-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor Katsuaki Nakagawa 46, Nakahara, Tobata-ku, Kitakyushu, Fukuoka 59 Nippon Steel Plant Design Co., Ltd. (72) Inventor Kazuhiro Marumugi 59 Nippon Steel Plant Design Co., Ltd. 46 Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture

Claims (5)

[Claims] 1. A vertical jet plating apparatus for performing electrolytic plating by running a strip between electrodes arranged facing each other with a predetermined gap, and a liquid supply nozzle for supplying an electrolytic solution between the electrodes, and electrodes. Side seals are provided at both ends in the width direction, a pressure equalizing chamber is provided on the back side of the electrode, and a large number of through-holes are provided in the electrode to connect to the pressure equalizing chamber. A vertical jet stream comprising a drainage device having a drainage box for accumulating and discharging the electrolytic solution and a seal device provided at the bottom of the vertical jet plating device for preventing the outflow of the electrolytic solution. Plating equipment. 2. A liquid supply nozzle provided on an upper part or a lower part of an electrode box is divided into at least two or more nozzle chambers by a partition wall, and liquid supply ports are provided on both sides of the primary nozzle chamber, respectively. 2. The vertical jet plating apparatus according to claim 1, wherein the partition wall is provided with a slit having a gap that gradually increases from the center to both sides. 3. A drainage box provided above or below the electrode box, a drainage port, a partition wall surrounding the strip provided inside the drainage box, and a drainage solution having a large number of through holes in the partition wall. The vertical jet plating apparatus according to claim 1, further comprising an apparatus. 4. The vertical jet plating apparatus according to claim 1, further comprising: a pressure equalizing chamber provided on the back side of the electrode and a conducting portion for conducting the respective pressure equalizing chambers. 5. The vertical jet plating apparatus according to claim 1, further comprising a pressure equalizing chamber electrolytic solution supply device for supplying a small amount of electrolytic solution to the pressure equalizing chambers respectively provided on the back surfaces of the electrodes.