JPH01147088A - Apparatus for electrolytically treating metal strip - Google Patents

Abstract

PURPOSE:To surely control the flow rate of an electrolytic soln. and to increase the efficiency of electrolysis by feeding the electrolytic soln. between each metal strip winding part of a guide roll and each insoluble electrode, discharging the soln. from a lower part and positioning the winding part in the electrolytic soln. in a tank. CONSTITUTION:A metal strip 2 is wound around a guide roll 1 and travelled. Insoluble electrodes 4A, 4B are placed at the metal strip winding parts of the roll 1 with gaps 3A, 3B in-between. Electrolytic soln. feeding pipes 6A, 6B connected to headers 5A, 5B are fitted to the upper parts of the electrodes 4A, 4B and an electrolytic soln. 9 is fed through circulation systems 11A, 11B, passed through the gaps 3A, 3B and discharged from a lower discharge hole 7. In this state, electric current is supplied between the strip 2 as the cathode and the electrodes 4A, 4B as the anode through conductor rolls 10A, 10B. The winding parts of the roll 1 are positioned in the electrolytic soln. 9 in a tank and an interference preventing plate 8 is preferably set at the central part of the discharge hole 7. By regulating the position of the winding parts in the soln. 9, the flow rate of the electrolytic soln. 9 in the gaps 3A, 3B is controlled.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an apparatus for electrolytic treatment of metal strips.

[Conventional technology]

When wrapping a guide roll with a metal band, an electrode is placed with a gap formed between the roll and the electrode, and the electrolyte is supplied from the top of the electrode to the gap, discharged from the bottom, and then supplied again after adjusting the liquid. It is known to continuously electrolytically treat a moving metal strip by using a guide roll as a cathode or a current-carrying roll and using an electrode as an anode while supplying the metal in circulation (Japanese Patent Laid-Open No. 59-215495, etc.). ...).

[Problem that the invention seeks to solve]

In such devices, it is difficult to control the supply flow rate of the electrolyte. In other words, since the electrolytic solution supplied between the guide roll (metallic band) and the electrode falls from the discharge port at the bottom, it is difficult to control the flow rate of the supplied electrolytic solution, and there are disadvantages such as the inability to improve electrolytic efficiency. It goes along with this.

[Means for solving problems]

The present invention has been made to advantageously solve these drawbacks, and is characterized in that a gap is formed in the part where the metal band is wound around the guide roll, and an insoluble electrode is disposed. This relates to an electrolytic treatment device for a metal band, in which the lower part of the guide roll metal band wrapping part is located in the electrolyte, in a processing device that has electrolyte supply pipes arranged at the top of both sides of the electrode and a discharge port at the bottom. be.

That is, as a conventional guide roll, a current-carrying function is provided, or a current-carrying roll is provided separately, and an insoluble electrode is arranged with a gap formed in the metal band wrapping part of the roll having only a guide function. In an electrolytic treatment device that has electrolyte supply pipes at the top of both sides of the electrode and a discharge port at the bottom,
Since the electrolyte is supplied from the top to the gap, the liquid falls naturally and is discharged from the outlet, making it difficult to control the flow rate of the liquid.If electrolytic treatment is applied, for example, by mebuki, the flow rate of the liquid will be high enough to reach the interface. It becomes difficult to raise the pH of the plating surface, and the plating surface is washed and partially removed, resulting in a decrease in plating efficiency.

However, in the present invention, the metal band-wrapped portion of the guide roll is located in the electrolytic solution, and the liquid to be discharged is configured to be discharged from the discharge port into the liquid, so that when the discharged liquid is discharged into the atmosphere. Since the resistance is greater than that of the above, the flow velocity in the gap during continuous supply can be reliably controlled.

That is, by adjusting the depth (immersion depth) at which the lower portion of the metal band wrapping portion of the guide roll is positioned in the electrolyte, the discharge speed of the electrolyte discharged from the discharge port into the solution can be adjusted.
The liquid flow rate in the gap can be controlled arbitrarily. Furthermore, it is possible to control the amount of electrolyte supplied to the electrolyte supply pipe and also control the flow rate within the electrode.

In addition, by arranging an interference prevention plate at the center of the above-mentioned discharge port in the direction in which the electrolyte flows out, it is possible to prevent the electrolytes falling from both sides from interfering with each other at the discharge port, and the flow rate can be controlled even more precisely. be able to.

The electrolytic treatment targeted by the present invention includes, for example, zinc,
These include one or more types of electroplating such as Ns + Sn + All + Fe, or chemical conversion treatment such as chromic acid treatment.

〔Example〕

Next, examples of the present invention will be described.

In the drawing, insoluble electrodes 4A and 4B are arranged by forming gaps 3A and 3B in the part A where the metal band 2 is wrapped around the guide roll l, and headers 5A and 5B are placed on both sides of the electrodes 4A and 4B.
Electrolyte supply pipes 6A and 6B are arranged through the electrode 4A.
, 4B, a discharge lower is provided at the lower part of the discharge lower, an interference prevention plate 8 is disposed at the center of the discharge lower in the electrolyte outflow direction, and a guide roll 1 is provided.
Place the metal band-wrapped part A in the electrolytic solution 9.

In the figure, 10A and IOB are conductor rolls.

Thus, the metal strip 2 is used as a cathode, and the insoluble electrode 4A.

4B as an anode, the electrolyte is supplied from the supply pipes 6A and 6B to the gaps 3A and 3B, and the falling electrolyte enters the electrolyte 9 through the gaps 3A and 3B and the flow rate is slightly reduced. The liquid flow rate in the gaps 3A and 3B is controlled because the flow rate of the subsequent electrolytic solution is also low.

be. The electrolytic solution 9 is circulated and supplied to the headers 5A and 5B by circulation systems 11A and IIB.

In the above example, one side of the metal strip 2 is subjected to electrolytic treatment, but in the case of double-sided treatment, a pair of devices as described above are provided, and after one side is treated, the other side is treated.

〔Effect of the invention〕

By doing so, it is possible to reliably control the flow rate of the electrolytic solution between the electrode and the metal band, and excellent effects such as improved electrolysis efficiency, productivity, and quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

Claims (2)

[Claims] (1) In a processing device in which an insoluble electrode is arranged with a gap formed in the part where the metal band is wound around the guide roll, electrolyte supply pipes are arranged at the upper part of both sides of the electrode, and a discharge port is provided at the lower part of the guide roll. 1. An electrolytic processing device for a metal band, characterized in that a metal band wrapping part is located in an electrolytic solution. (2) The electrolytic treatment apparatus for metal strips according to claim 1, wherein an interference prevention plate is disposed at the center of the discharge port in the electrolyte outflow direction.