JPH01301885A - Electrolytic device - Google Patents

Abstract

PURPOSE:To reduce a leak current and to prevent electrolytic corrosion and sparking by electrically insulating the pretreating cell and/or post-treating cell of the title electrolytic device and respective pipelines. CONSTITUTION:A metallic web 2 is supplied from a delivery machine 1, and chemically etched in the pretreating cell 4 as the pretreatment. The web 2 is then electrolytically etched and electroplated in the feeder cell 11 and reaction cell 12 of an electrolytic cell 7. The plated web 2 is then applied with the post- treatment such as death matting in the post-treating cell 16, dried by a drier 19, and wound on a winder 20. In the electrolytic device, the pretreating cell 4, the post-treating cell 16, and their pipelines are electrically insulated 25, 26, 29, and 30. By this method, the leak current to a series of the web 2, processing soln. tanks 5 and 17, pipeline, and rack 23 is reduced, and the equipment trouble of electrolytic corrosion and sparking due to abnormal contact of the web 2 with the cell is obviated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrolytic treatment device for metal strips, particularly an electrolytic treatment device for PS plates, an electrolytic plating treatment device for iron plates, an electrolytic treatment device for metal films for electrolytic capacitors, etc. It is related to.

[Conventional technology]

In the conventional electrolytic treatment apparatus, for example, as shown in FIG.
After that, the metal surface first enters the pre-treatment tank 4 where etching treatment with NaOH or acid is carried out to clean the metal surface.
The etching solution in the i-ring tank 5 is transferred to the pretreatment tank 4 using a pump 6.
Etching is performed while circulating. After etching, the metal web is desmutted, washed with water, passed through a pass roll, and then enters an electrolytic treatment tank 7. The electrolytic treatment tank 7 is divided into, for example, a power supply cell 11 and a reaction cell 12, and each cell has a circulation tank 1.
3 and a circulation pump 14 to circulate the electrolyte in the cell, while being powered by an electrolytic power source (AC or DC) 10, and current is passed through the power supply cell utility pole 89 and the reaction cell electrode 9 to the metal web 2. , the metal web 2 is electrolytically etched or electroplated. After the electrolytic treatment as described above, the metal web 2 is placed in a post-treatment tank 16 containing acid or alkaline liquid for the purpose of removing or cleaning smut that has adhered to the surface of the metal web due to electrolysis. enter.

The post-processing liquid in the circulation tank 17 is circulated to the post-processing tank 16 by a pump 18 .

The cleaned metal web 2 then enters a drying device 19, and after drying is wound onto a winding core 21 by a winding machine 20.

In such an apparatus, the power supply cell 11 of the electrolytic treatment tank 7.
The reaction cell 12 is made of an insulating material such as polyvinyl chloride (PVC), fiber-reinforced plastic (FRP), or a rubber-lined iron plate, and is connected to the circulation tank 13 of the electrolytic treatment tank 7. Pump +4° piping materials are similarly addressed.

In addition, an insulating material such as a rubber roll is used for the pass roll 3, and the delivery winding core 229 and the take-up winding core 21 are also made of an insulating material such as a rubber lining made of paper or iron. is worshiped.

[Problem to be solved by the invention]

However, the pretreatment tank 4 of the electrolytic treatment equipment. (For example, N
Etching treatment with aOH) and post-treatment 16 (e.g., desmut treatment) are usually treated with an electrically conductive solution such as acid, alkali, or water, and these tanks are made of stainless steel from the viewpoint of corrosion resistance and heat resistance. It is commonly produced.

For this reason, a leak current flows through the metal web 2 → processing liquid tank 5 or 17 → piping to the pedestal 23, and as shown in FIG. In addition, a leak current 45 on the pre-treatment tank side and a leak current 46 on the post-treatment tank side are generated and flow to the mount resistor 44.

This current is 1/100 of the current value that normally contributes to electrolytic reactions.
Since it is as small as ~1/10,000, it does not affect the reactivity, but it has the following drawbacks. That is, (1) due to leakage current, the pretreatment tank 4. Post-treatment tank 16, circulation tank 5.17. Pump 6.18. Also, electrolytic corrosion occurs in related piping, causing problems such as liquid leakage.

(2) If the metal web comes into contact with the pre-treatment tank 4° and the post-treatment tank 16 due to meandering, etc., the resistance of the leakage current circuit becomes small due to the metal contact, so a large current flows and sparks are generated. Therefore, the H7 atmosphere generated by melting during metal surface treatment is extremely dangerous.

The present invention solves the conventional problems, reduces leakage current, eliminates equipment troubles caused by electrolytic corrosion, improves reliability of equipment, and prevents the metal web from coming into contact with the tank in the event of an abnormality such as meandering or cutting of the metal web. To provide an electrolytic treatment device that can suppress leakage current and does not generate sparks even if a situation occurs.

C. Means and operation for solving the problem] The above-mentioned object of the present invention is to provide an electrolytic treatment apparatus for continuously electrolytically treating a running metal web, in which a pre-treatment tank and/or a post-treatment tank of the electrolytic treatment apparatus and each This is achieved by an electrolytic treatment apparatus characterized by electrically insulating the piping.

Electrically insulating the pre-treatment tank and/or the post-treatment tank of the present invention means that when the electrolytic treatment equipment has a pre-treatment tank and a post-treatment tank, it is necessary to insulate both the pre-treatment tank and the post-treatment tank. In the case of an electrolytic treatment apparatus similar to that shown in Fig. 3, it is electrically insulated as shown in Fig. 1. Examples of electrical insulation methods include, for example, Figs. As shown in FIG. 1, nylon is applied to the pedestal 23 as an insulating spacer for the pre-treatment tank insulation 25° and the post-treatment tank insulation 26, and fastened with bolts (SUS material) 32.

In addition, as electrical insulation for each piping, for example, as shown in FIG. 1 and FIG. 5(b), piping materials 33a and 3 are used.
This can be done by inserting a polypropylene insulating tube between the pre-treatment tank piping insulation 29 and the post-treatment tank piping insulation 30 between the pre-treatment tank piping insulation 29 and the post-treatment tank piping insulation 30.

In this case, in the equivalent basic circuit according to the present invention, as shown in FIG. 2, the current of the electrolytic power source 41 flows through the power supply cell resistor 421 and the reaction cell resistor 43, and a leak current 45 on the pre-treatment tank side and a leak current on the post-treatment tank side are generated. Current 46 and pretreatment insulation resistance 47. The addition of the large resistance of the post-treatment insulation resistor 48 results in a very small leakage current.

In addition to the present invention, as shown in FIG.
Insulation 31 may also be applied to the pedestal portion of the drying device 19 to ensure complete safety.

〔Example〕

Leakage current was measured when the electrolytic treatment apparatus of the present invention was insulated as shown in FIG. 1 and when the conventional electrolytic treatment apparatus was installed as shown in FIG. 3.

In this case, the electrolytic current is 50 cm DC.

10.0OOA was used, but the conventional leakage current value was 200A.
However, according to the present invention, the current can be reduced to about one-tenth of 20A.

[Effects of the Invention] The insulated electrolytic treatment equipment of the present invention reduces leakage current, eliminates equipment troubles due to electrolytic corrosion, improves equipment reliability, and prevents abnormalities such as meandering and cutting of metal webs. Even if the metal web occasionally comes into contact with the tank, safety is ensured by suppressing leakage current and preventing sparks.

[Brief explanation of the drawing]

FIG. 1 is a schematic layout diagram of an embodiment of the electrolytic treatment apparatus of the present invention, FIG. 2 is an equivalent basic circuit diagram of the present invention, FIG. 3 is a schematic layout diagram of an example of a conventional electrolytic treatment apparatus, and FIG. 4 5 is a conventional equivalent basic circuit diagram, and FIG. 5 is a side view of a frame portion (a) and a portion of a tube (b) of one embodiment of insulation according to the present invention. 1... Delivery R2... Metal web 3... Pass roll 4... Pretreatment fl N7...
Electrolytic treatment tank 11... Power supply cell I2... Reaction cell 16... Post-treatment tank 19... Drying device 20.
... Winder 23 ... Frame 24 ... Electrolytic treatment tank insulation 25 ... Pre-treatment tank insulation 26 ... Post-treatment tank insulation 27 ... Sending machine insulation 28 ... Winding machine insulation 29 ... Pre-treatment tank piping insulation 30 ... Post-treatment tank piping insulation 31 ... Drying device insulation 32 ... Bolts 33a, 33b --- Piping 41 ... Electrolytic power source 42 ... Power supply cell resistance 43・ ・Reaction cell resistance 44... Frame resistance 45... Pre-treatment tank side leak current circuit 46... Post-treatment tank side leak current circuit 47... Pre-treatment insulation resistance 48... Post-treatment insulation resistance No. 5 Figure (b)

Claims (1)

[Claims] An electrolytic treatment apparatus for continuously electrolytically treating a traveling metal web, characterized in that a pre-treatment tank and/or a post-treatment tank of the electrolytic treatment apparatus and respective piping are electrically insulated.