JP2002060994A - Electrolytic treating device for belt-like metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic treating device for a belt-like metal which can suppress the fluctuation in a plating coating weight by eliminating the biasing of the belt-like metal between electrode plates and can improve the quality of products and reduce a plating alloy cost. SOLUTION: This electrolytic treating device 10 is provided with a sink roll 15 for guiding the belt-like metal 13 within an electrolytic cell 12 containing an electrolyte 11 and is arranged with aperture of electrode plates 17a, 17b, 18a and 18b respectively on the inlet side and outlet side of the sink roll 15 across the belt-like metal 13. The electrode plate 18a on the sink roll 15 side of a pair of the electrode plates 18a and 18b arranged on the outlet side of the sink roll 15 is formed longer than the other electrode plate 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic processing apparatus for cleaning or electroplating strip metal.

[0002]

2. Description of the Related Art Conventionally, a hot rolled and cold rolled strip metal is plated with zinc, tin, nickel, or the like, depending on the application of the material, such as a building material or an automobile. A horizontal electrolyzer and a vertical electrolyzer are used for the plating treatment on the band-shaped metal, but a vertical electrolyzer is often used from the viewpoint of downsizing of the equipment and speeding up the passage. As shown in FIG. 4, in this vertical electrolytic device, conductor rolls 22 and 23 for guiding a strip-shaped metal (thin steel plate) 29 are arranged on both sides above an electrolytic treatment tank 21 containing an electrolytic solution 20. A sink roll 24 is disposed inside the processing tank 21,
The strip-shaped metal 29 is guided from the conductor roll 22 on the entry side to the sink roll 24, and
Through the system and transported to the next step. Electrolyte 20
Is placed in the electrolytic treatment tank 21, a pair of electrode plates 25 and 26 are arranged between the conductor roll 22 and the sink roll 24 on the normal entrance side with the band-shaped metal 29 interposed therebetween, and the sink roll 24 and the conductor roll on the exit side are disposed. Metal strip 2 between 23
Electrode treatment is performed by disposing a pair of electrode plates 27 and 28 sandwiching the electrode 9 and adjusting the distance between the electrodes and the band-shaped metal 29, the current value, and the like, so that the surface of the band-shaped metal 29 is evenly plated. It is carried out. However, since the band-shaped metal 29 is displaced between the electrodes due to the warpage or deflection of the band-shaped metal 29 in the width direction and the uneven flow of the electrolytic solution 20, the amount of plating of the band-shaped metal 29 in the width direction fluctuates. However, there are problems such as a decrease in product value and an increase in alloy cost due to an increase in plating amount (basis weight). As a countermeasure against this, Japanese Patent Laid-Open No.
As described in Japanese Patent Publication No. 123898, a plating solution pressurized by a pump is jetted between the electrode plate and the strip metal, and the pressure of the jetted plating solution prevents contact between the strip metal and the electrode plate, thereby preventing metal ions. Has been promoted to spread to the plating surface. Further, as described in Japanese Utility Model Application Laid-Open No. 5-69167 and Japanese Utility Model Application Laid-Open No. 5-96068, a groove conducting in the thickness direction of the electrode plate is provided on the upper portion of the electrode plate, and between the electrode plates during high-speed passing. By stabilizing the supplied plating solution, the plating amount (basis weight) is made uniform in the width direction of the strip-shaped metal. Further, as described in Japanese Utility Model Application Laid-Open No. 5-62575, on the upper part of the electrode plate suspended from above the plating solution surface, facing the strip metal running in the electrolytic treatment tank of the vertical electrolytic device, the strip metal is placed. By providing a notch groove for flowing the plating solution in the width direction, a rise of the plating solution (solution head-up) due to a high-speed pulling of the strip metal is suppressed, and a piece of the strip metal position between the electrode plates is suppressed. It has been practiced to prevent deviation and make the plating amount of the strip-shaped metal uniform in the width direction.

[0003]

However, the method described in Japanese Patent Application Laid-Open No. 58-123898 requires the installation of a pump for increasing the pressure of the plating solution and a special electrode plate. And equipment costs increase. In addition, it is not possible to reliably prevent the strip metal from being offset between the electrode plates by the strip metal being drawn by the flow of the plating solution formed as the sink roll rotates. Further, Japanese Utility Model Laid-Open No. 5-69167 and Japanese Utility Model Laid-Open No. 5-9606.
No. 8 and Japanese Utility Model Application Laid-Open No. 5-62575, when a vertical electrolytic device is used, it is possible to suppress a rise in the plating solution level with the lifting of the strip-shaped metal passing between the electrode plates. However, the strip metal is attracted to the flow of the plating solution formed in the rotation direction of the sink roll, and the distance between the strip metal and the electrode plate fluctuates. In particular, when there is sheet warpage, even when the applied voltage is adjusted, the amount of plating applied to the surface of the strip-shaped metal varies. Moreover, since the electrode plate is notched, the cross-sectional area of the current is reduced, the heat generated during energization by Joule heat is increased, the temperature of the electrode plate and the plating solution is increased, and the temperature of the plating solution is kept constant. There are problems such as an increase in the load on the cooling device and a change in the amount of deposited plating.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and aims at eliminating deviation of a strip-shaped metal between electrode plates, suppressing a change in the amount of plating, improving the quality of a product, and reducing the cost of a plating alloy. It is an object of the present invention to provide an apparatus for electrolytically treating a strip-shaped metal.

[0005]

According to the first aspect of the present invention, there is provided an apparatus for electrolytically treating a strip-shaped metal, wherein a sink roll for guiding the strip-shaped metal is provided in an electrolytic tank containing an electrolytic solution.
In an electrolytic treatment apparatus in which a pair of electrode plates are disposed on both the entrance side and the exit side of the sink roll with the strip-shaped metal interposed therebetween, the sink roll of the pair of electrode plates disposed on the exit side of the sink roll The electrode plate on the side is longer than the other electrode plates. Thus, the flow toward the inside of the electrolytic solution (plating solution) accompanying the rotation of the sink roll in the electrolytic cell can be blocked by the electrode plate on the sink roll side (inside), and the band-shaped metal is cut off on the inner electrode plate side. Can be prevented.

According to a second aspect of the present invention, there is provided an apparatus for electrolytically treating a strip-shaped metal according to the second aspect of the present invention, wherein a sink roll for guiding the strip-shaped metal is provided in an electrolytic tank containing an electrolytic solution, and an inlet and an outlet of the sink roll. In each of the sides, in the electrolytic processing apparatus arranged a pair of electrode plates sandwiching the band-shaped metal, the pair of electrode plates disposed on the output side, the length is the same,
Among the electrode plates, an electrode plate on the sink roll side is provided with a blocking plate for suppressing the flow of the electrolytic solution. At the lower end of the electrode plate,
Since the blocking plate is connected, it is possible to suppress the displacement of the strip-shaped metal due to the flow toward the inside of the electrolytic solution accompanying the rotation of the sink roll. Moreover, since the electrode plates acting for the electrolytic treatment of the band-shaped metal have the same length, the amount of plating on the band-shaped metal can be made uniform.

Further, it is preferable that the blocking plate is formed of an insulating material. This suppresses the flow of the electrolyte,
At the same time, the amount of plating on the strip-shaped metal can be made stable and uniform.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is an overall view of a strip-shaped metal electrolytic processing apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an electrode plate with a blocking plate according to a modification of the electrolytic processing apparatus, and FIG. It is a schematic diagram showing the flow of the electrolytic solution of the processing apparatus. As shown in FIG. 1, a strip-shaped metal electrolytic treatment apparatus 10 according to one embodiment of the present invention includes a Sn metal, which is an example of an electrolytic solution.
Conductor rolls 14, 16 each having a driving source (not shown) for guiding a thin steel plate 13, which is an example of a strip-shaped metal, into the electrolytic bath 12 having a steel electrolytic bath 12 containing a solution 11 therein. And a sink roll 15. Further, above the electrolytic cell 12, a conductor roll 14 disposed on the entry side of the thin steel sheet 13 and a sink roll 15 disposed inside the electrolytic cell 12 are connected to a power supply device (not shown) with the thin steel sheet 13 interposed therebetween. A pair of electrode plates 17a,
17b and a conductor roll 16 and a sink roll 15 arranged above the electrolytic cell 12 and on the exit side of the thin steel plate 13.
Between them, there is provided a pair of electrode plates 18a and 18b connected to the power supply device with the thin steel plate 13 interposed therebetween. Electrode plate 17a,
17b has a length of 1500 to 1800 mm and a width of 120
The same size is used in the range of 0 to 1500 mm. The width of the electrode plates 18a and 18b is 1
The electrode plate 18a provided on the sink roll 15 side (inside) has the same size in the range of 200 to 1500 mm,
It is longer by 100 to 270 mm than the electrode plate 18b (length: 1500 to 1800 mm).

Next, the operation of the apparatus for electrolytically treating a strip-shaped metal according to one embodiment of the present invention will be described. The conductor rolls 14 and sink rolls 15 on the entry side and the conductor roll 16 on the exit side are rotated, and the thin steel plate 13 is placed in the electrolytic bath 12 containing the Sn solution 11 for approximately 400 to 600 m.
/ Min speed. When the thin steel sheet 13 conveyed into the electrolytic cell 12 passes between a pair of electrode plates 17a and 17b provided on the entry side of the sink roll 15, the thin steel plate 13
17b, the Sn in the Sn solution 11
Precipitates on the surface of the thin steel plate 13 and is plated. Further, the thin steel sheet 13 turned by the sink roll 15 has a thickness of 100 to 270 mm provided on the exit side of the sink roll 15.
Pass between the inner electrode plate 18a having the extension portion 19 and the electrode plate 18b of the normal length, and the electrode plates 17a,
By the same operation as 17b, the surface of the thin steel plate 13 is plated. The thin steel plate 13 may be warped in the width direction, and the electrode plates 17a and 17b and the electrode plate 18 may be warped.
When passing through a and 18b, the current value is adjusted in consideration of the warpage, so that the variation in the plating amount in the width direction of the thin steel plate 13 is reduced.

However, as shown in FIG. 3, since the sink roll 15 is rotating in the direction of the arrow (dotted line in the figure), the flow of the Sn solution 11 accompanying this rotation direction (dotted line arrow in the figure). Occurs. Therefore, by blocking this flow by the extension portion 19 of the electrode plate 18a, the inward flow generated by the rotation of the sink roll 15 can be minimized, and the thin steel plate 13 is drawn to the electrode plate 18a side. Can be prevented. As a result, the electrode plate 18
a and the flow toward the electrode plate 18b are equalized, and the thin steel plate 13 approaches or comes into contact with the electrode plate 18a under the influence of the warpage of the thin steel plate 13, the flow of the Sn solution 11, and the like. Can be prevented. Then, the electrode plate 18
The surface of the thin steel plate 13 that has been passed through with a small variation in the distance between the a and 18b is subjected to uniform Sn plating, the variation in the amount of Sn plating per unit area is reduced, and the quality of the product is improved. Alloy costs can be reduced and operations can be stabilized. Furthermore, since the electrode plates 18a and 18b are not subjected to specific processing (grooves and the like), a rise in the temperature of the Sn solution 11 and the electrode plates 18a and 18b is suppressed.
The load on the first cooling device can be reduced.

Next, an electrode plate 18c which is a modified example of the electrode plate 18a of the strip-shaped metal electrolytic processing apparatus according to the present embodiment will be described. As shown in FIG. 2, the electrode plate 18c is replaced with an electrode plate 18a having an extension 19 instead of the electrode plate 18a.
It is arranged in the electrolytic cell 12 so as to be paired with b. The electrode plate 18c has the same width and length as the electrode plate 18b, and has a blocking plate 19a at the lower end. The shielding plate 19a
It has a length of 00 to 270 mm and is fixed to a support member (not shown) attached to the lower end of the electrode plate 18c by commonly used fastening means such as bolts and nuts. as a result,
The flow between the electrode plate 18c and the electrode plate 18b is equalized, and the thin steel plate 13 approaches the electrode plate 18c under the influence of the warp of the thin steel plate 13, the flow of the Sn solution 11, and the like. Contact can be prevented. And
Sn plating applied to the surface of the passed thin steel plate 13 can be made uniform, and variation in the amount of Sn plating can be suppressed to stabilize the operation. In particular, since the electrode areas on both sides acting on the thin steel plate 13 can be made equal, fluctuations in the plating amount due to the difference in the length of the electrode plates can be eliminated, and more favorable results can be obtained. As a material used for the shielding plate 19a, for example, acrylic, ceramic, vinyl chloride, FRP, or the like, which is an insulating material, can be used. The electrolytic treatment apparatus for a strip-shaped metal according to the present invention uses a Sn plating solution as an electrolytic solution, but is also applicable to electrolytic treatment such as Zn plating, Ni plating, and Zn-based alloy plating, or electrolytic degreasing or electrolytic cleaning. Can be applied.

The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiment, and all changes in conditions that do not depart from the gist are within the scope of the present invention. For example, in addition to a thin steel plate, an aluminum steel plate, a copper plate, or the like can be used for the electrolytic treatment as the band-shaped metal. Further, the shield plate can be attached integrally to the electrode by attaching a support member to the electrode in advance and incorporating the shield plate into the support member.

[0013]

According to the present invention, there is provided an apparatus for electrolytically treating a strip-shaped metal, wherein a sink roll for guiding the strip-shaped metal is provided in an electrolytic tank containing an electrolytic solution, and the sink roll is provided on each of an inlet side and an outlet side. In an electrolytic treatment apparatus in which a pair of electrode plates are disposed with a band-shaped metal interposed therebetween, the electrode plate on the sink roll side of the pair of electrode plates disposed on the output side of the sink roll is longer than the other electrode plates. In addition, it is possible to eliminate unevenness of the strip-shaped metal due to the flow of the electrolytic solution accompanying the rotation of the sink roll, suppress the variation in the plating amount, save the plating alloy, improve the product quality, and perform a stable operation.

[0014] In particular, in the apparatus for electrolytically treating a strip-shaped metal according to the present invention, a sink roll for guiding the strip-shaped metal is provided in an electrolytic bath containing an electrolytic solution, and a strip-shaped metal is provided on each of the entrance side and the exit side of the sink roll. In an electrolytic treatment apparatus in which a pair of electrode plates are disposed with a metal interposed therebetween, the pair of electrode plates disposed on the output side is
Its length is the same, and among the electrode plates, a shield plate that suppresses the flow of the electrolyte is provided on the electrode plate on the sink roll side, so that the flow toward the inside of the electrolyte is suppressed with a simple structure, and The amount of plating on the strip-shaped metal can be made uniform.

According to the third aspect of the present invention, since the blocking plate is made of an insulating material, the flow of the electrolytic solution is suppressed, and at the same time, the amount of plating on the strip metal is made more uniform, thereby improving the product quality and operation. Stability and the like can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall view of an apparatus for electrolytically treating a strip-shaped metal according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an electrode plate to which a blocking plate according to a modification of the electrolytic processing apparatus is mounted.

FIG. 3 is a schematic diagram showing a flow of an electrolytic solution in the electrolytic processing apparatus.

FIG. 4 is an overall view of a vertical electrolytic device according to a conventional example.

[Explanation of symbols]

10: electrolytic treatment apparatus, 11: Sn solution, 12: electrolytic tank, 13: thin steel plate, 14: conductor roll, 15:
Sink roll, 16: conductor roll, 17a: electrode plate, 17b: electrode plate, 18a: electrode plate, 18b: electrode plate, 18c: electrode plate, 19: extension, 19a: blocking plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yusuke Noda 1-1, Hibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture F-term in the Nippon Steel Corporation Yawata Works (reference) 4K024 AA03 AA05 AA07 BC01 CB06 CB08 CB10 CB16 CB21 CB26 EA03

Claims (3)

[Claims] 1. A sink roll for guiding a strip-shaped metal is provided in an electrolytic cell containing an electrolytic solution, and a pair of electrode plates are arranged on each of the entrance side and the exit side of the sink roll with the strip-shaped metal interposed therebetween. In the electrolytic processing apparatus, the electrode plate on the sink roll side of the pair of electrode plates disposed on the outlet side of the sink roll is longer than the other electrode plates. 2. A sink roll for guiding a strip-shaped metal is provided in an electrolytic cell containing an electrolytic solution, and a pair of electrode plates are arranged on each of the entrance side and the exit side of the sink roll with the strip-shaped metal interposed therebetween. In the electrolytic treatment apparatus, the pair of electrode plates disposed on the outlet side have the same length, and a shield plate for suppressing the flow of the electrolytic solution is provided on the electrode plate on the sink roll side of the electrode plates. An apparatus for electrolytically treating a strip-shaped metal. 3. An apparatus for electrolytically treating a strip-shaped metal according to claim 2, wherein said blocking plate is made of an insulating material.