KR101465773B1 - Cathode for reel-to-reel plating - Google Patents

Abstract

The present invention relates to a cathode electrode device and a cathode electrode which are used semi-permanently during a reel-to-reel plating process, wherein the reel-to-reel plating process is an indirect plating method that the cathode electrode is not deposited in a plating solution. The cathode electrode device and the cathode electrode according to the present invention can be used semi-permanently and improve productivity more than twice since the current flow rate is more than twice compared with a conventional stainless electrode and the cathode electrode prevents easy abrasion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a negative electrode for re-

The present invention relates to a negative electrode for plating in continuous reel tulle plating.

In general, the wet plating process can be divided into a plating type, REEL-TO-REEL, ROLL-TO-ROLL, BARREL, and RACK.

It is a direct plating method in which the anode is made into a recoat, the anode is made into a recoat, and the product is placed on the lak and directly immersed in the plating solution. In this case, the lek is mostly made of copper and the whole is coated with a resin such as urethane. It is in the form of a pin made of stainless steel. It hangs the product and plated in the plating solution.

Electro Barrel plating is a direct plating method in which a cathode electrode is installed in a barrel, and the product is directly contacted with the product to conduct plating so that the product is directly immersed in the plating solution and plated in a locked state.

The roll-to-roll plating is a type in which an electrification roll is provided on a plating liquid, a cathode wire is connected to a rectifier, and indirectly electrons and electric charges are indirectly transmitted through a plate- Is an indirect plating method suitable for continuous plating of a wide plate type.

Reeluril plating is an indirect plating method similar to a roll-to-roll method, or a continuous plating method in which a product is vertically erected. In this case, an electrode tank serving as a water tank is formed on both or one side of the plating tank to form a cathode electrode. The lower edge of the cathode electrode, or the upper and lower edges passing through the surface of the cathode electrode.

Therefore, the plating method in which the cathode does not directly enter the plating solution includes a reel-to-reel continuous plating method and a roll-to-roll continuous plating method.

The reel-to-reel type plating is suitable for products with spring properties or slightly thicker products, and the roll-to-roll method is suitable for plating products that are too thin to be plated or have a wide width.

On the other hand, the reel-to-reel plating is mainly a plate-like body, and the plate-shaped body is a plate-shaped electronic component that is formed by making terminals of a circuit, a lead frame and terminals of a semiconductor in a plate form, plating them, .

In general, plate material plating in a state in which any part shape is not made in advance can be performed by reel tolure or roll to roll plating, but it is possible to use a plate material in which a part shape is formed through a punching process or a molding process, When roll-to-roll plating is carried out, the shape of the product changes and becomes unusable.

Such products should be subjected to reuturil continuous plating, for example, a process of silver plating the LED light emitting portion.

This part is manufactured by plate plating method in which nickel plating and part silver plating are performed on the phosphor bronze plate in advance and parts are formed in advance, and then one by one is taken out and used.

The roll of the roll-to-roll coating was not in direct contact with the plating solution but in contact with a wide surface of the plating of the plate, so that it could be used semi-permanently. However, in the case of reel tolure plating, Causing many problems in the meantime.

A cathode electrode ordinarily used was phosphor bronze material. However, the conductivity of the phosphor bronze was not so bad, but it was a weak metal, and there was a problem that the wear was easily occurred. Therefore, the replacement cycle was short, and irregular scratches were caused on the side wall of the product due to abrasion.

Especially, when plating on strong metal such as stainless steel, the electrode was damaged by abrasion because it could not be used for 24 hours.

Subsequently, it was developed as a cathode electrode for plate plating or plate-like body plating, which was a cathode electrode for use in grooves of SUS304 and SUS316 materials. However, this cathode electrode had poor conductivity and caused unspecified spark failure, and the production rate of the plating was more than twice that of using phosphor bronze as the cathode electrode.

In order to overcome this disadvantage, there has been an attempt to use an energized roll type roll as an electrode in the reel tuil plating. For example, a utility model application number 20-2009-0002832.

However, such an electrode has the advantage of extending the lifetime of the electrode because the roll is rotated in the same direction, but the contact area between the material and the electrode during plating of the plate or plate material is too small to allow smooth energization, .

In addition, when there is a problem in a portion contacting with the plate or the plate, it takes too much time when the electrode needs to be replaced, thereby causing the problem that the continuous plating must be stopped.

In such a reel-to-reel plating, even if the electrode is made of stainless steel and plated with copper or phosphor bronze plate or plate, even if it is plated slowly at a speed of about 4 meters per minute or less, And it becomes impossible to use continuously.

The biggest problem is the poor adhesion due to an unspecified spark that accompanies the deterioration of productivity in the continuous plating.

The poor adhesion due to this unspecified spark causes difficulty in determining the position of defects in continuous plating, which causes the disposal of a large number of products without being used, and thus the economic loss has become a part of the plating company.

Therefore, in the continuous plating of the reel-to-reel plating, particularly the plate plating and the plating of the plate-shaped body, it does not cause any unspecified spark failure, the conductivity of the electrode is good and the management is easy, and the contact area with the plate and the plate- It is necessary to develop a cathode electrode capable of high-speed plating by using in a large amount.

SUMMARY OF THE INVENTION An object of the present invention is to develop a cathode electrode which does not cause poor adhesion due to unspecified spark failure in continuous plating of reel to plur plating, which is an indirect plating method in which the cathode electrode is not immersed in a plating bath.

It is another object of the present invention to develop a cathode electrode for continuous re-tulle plating capable of accepting a large current of 20,000 W or more without spark failure.

It is still another object of the present invention to develop a cathode electrode that is easier to manage than a conventional cathode electrode in reeluril plating.

It is still another object of the present invention to develop a semi-permanent cathode electrode in continuous re-tulle plating.

Due to the present invention, even in the indirect plating of the re-tulle type, it can be used semi-permanently like a roll-to-roll plating type electrification roll. In addition, when the upper and lower cathode electrode sets receive electricity of 20,000 W or more and the plate or plate material made of phosphor bronze or stainless steel is plated for 4 months or more, the wear is hardly occurred and the spark defect due to the electrode does not occur for 4 months It is possible to fundamentally solve the unspecified adhesion failure of the plating product.

1 is a view showing the overall bird's eye view
Fig. 2 is a side view of the bottom portion of the cathode electrode holder. Fig.
FIG. 3 is a view showing a bottom view of the lower portion of the cathode-
4 is a cross-sectional view of the cathode-
5 is a bird's-eye view of a cathode electrode after processing.
Fig. 6 is a view of the whole structure of the cathode electrode manufactured by bird's-eye view.
7 is a cathode electrode to be installed in an electrode holder.

As a result of examining the materials of the cathode electrodes which have been used conventionally, gold, silver, copper, aluminum and alloys thereof having good conductivity are difficult to use because they are too soft metal. Platinum group elements are easy to use but are formed at too high cost It is an economical burden to use as a cathode electrode for general plating.

In addition, conventionally, the stainless steel used as the cathode electrode of the plate material and the plate material plating has a problem that the conductivity is too bad and the plate material such as phosphor bronze or stainless steel of 0.1 mm or the plate material is sharply grooved during the plating process, Can not be solved.

As a result of repeated experiments, the present inventors have found that a tungsten alloy having 80% to 99% of tungsten and tungsten has a lower conductivity than silver, gold, copper, and aluminum. However, It is possible to prevent the spark failure due to the contact as much as possible because the conductivity is higher than the conductivity.

Conductivity table of metals
metal Chemical symbol Atomic weight Specific gravity (20 ℃) Melting point (캜) Electric conductivity silver Ag 107.9 10.5 960.5 100 Copper Cu 63.55 8.96 1083 94 gold Au 197.2 19.32 1063 67 aluminum Al 26.9 2.7 660 57 antimony Sb 121.76 6.62 630 34.22 Tungsten W 183.92 19.3 3410 29.5 zinc Zn 65.38 7.13 419.5 25.5 Nickel Ni 58.7 8.9 1455 20.5

Further, in the case of the cemented carbide including tungsten and tungsten, since the hardness of the cemented carbide is as small as that of the diamond, it can not be easily worn by phosphor bronze, brass or stainless steel. .

Hereinafter, the present invention will be described by way of examples.

[Example 1] Production of a cathode electrode holder for continuous re-tulyl plating.

1 to 4 are bird's-eye views of an electrode holder to be provided with a cathode electrode in the continuous re-tulle plating.

The entire electrode can be made of tungsten without forming a cathode electrode holder, but in this case, there is no undesirable impurities or adhesion force that can be applied to the electrode. However, when plating is weakly formed, There is.

Therefore, it is advantageous to use an electrode made of tungsten only in a portion contacting the plate material or the plate material, and to form a cathode electrode holder so that the remaining portion can be easily separated. In case of replacing or repairing the electrode, Can be replaced.

This cradle is connected to the cathode of the rectifier and the electric wire.

The material of the cathode electrode holder may be composed of tungsten, stainless steel, copper, phosphor bronze, nickel, titanium, zirconium or the like. However, since tungsten is too hard, it is difficult to process it as a cradle, and copper, phosphor bronze, and nickel are very durable.

Although electrical conductivity is poor, stainless steel, titanium and zirconium are suitable.

However, it is not necessary to use expensive titanium or zirconium because it is installed in a water tank or installed in a separate electrode tank, not in a plating solution.

6 is a real cathode electrode holder made of stainless steel 316 in the shape of a bird's-eye view.

A square or circular rod shaped electrode was inserted and clamped on the upper and lower sides of the holder, and an extra fastening part was made so that the wire could be fastened to the lower electrode holder.

[Example 2] Production of cathode electrode for continuous reeluril plating.

The negative electrode material to be used as a rod in a cathode electrode holder for a re-tulle continuous plating process is a cemented carbide material containing at least 80% to 99% of tungsten and tungsten and 1% to 20% of at least one of thorium, lanthanum, cerium, zirconia, Tungsten alloys can be used.

When the tungsten content is less than 80%, the hardness is lowered, and wear is liable to occur.

FIG. 5 is a view showing the shape of a cathode electrode. FIG. 5 is a view showing a contact surface with a sheet material or plate material by processing an alphabet letter U or V letter shape into a rod-shaped tungsten material.

At this time, it is easier to process the V character than U character, and it is better to keep the angle at least 90 degrees and less than 150 degrees when machining with the V character.

FIG. 7 is a perspective view of an electrode according to the present invention in which a V-shaped groove is formed at an angle of 90 degrees to a bar-shaped tungsten.

This electrode was installed in the upper and lower grooves of the cathode electrode holder of Example 1 and fixed with a fastening agent so that it was installed in an electrode tank that also served as a water bath.

 [Example 3] Electrode life and plating experiment.

Since electrode testing requires a comprehensive evaluation of the life and current of the electrode in the process of plating a large amount of plate or plate over a long period of time, a contract has been concluded to maintain confidentiality. The evaluation was verified by Haipy Co., Ltd.

Test period: 2014.01.02 ~ 2014.04.18

Plating Material: Stainless Steel 304 Material Width 200mm, Phosphor Bronze Material Width 20mm ~ 114.5mm

Plating amount: about 103 tons (about 3 tons of stainless steel, about 100 tons of phosphor bronze)

Test result : Item Conventional (stainless steel electrode) Invention electrode Electrode SIZE 316 SUS version Diameter 6mm round bar 15cm Spark occurrence It occurs irregularly. No occurrence during the test period. Worn electrode Depth grooved and worn Not worn. Replacement during work Not replaceable Easy to replace. Electrode cleaning Organize grooves with tools Easily peeled and cleaned with nitric acid Phosphor bronze material 0.1mm width 84mm
1.5 micron nickel plating
Metals per minute 5m / min 11m / min or more Maximum current during the experiment 12,056 W
(8.8V * 1,370A) 23,220 W
(13.5V * 1720A)

An encouraging result was obtained during the experiment. Whether or not the cathode electrode can withstand the surface where the cathode electrode and the stainless steel are in contact with each other during the stainless steel plating, the electrode was not worn at all and no spark was generated.

When the anode electrode was covered with debris, it was easily peeled off with nitric acid, and the electrode could be maintained in a clean state at all times.

In addition, the area of contact with the product was wide enough to allow the electricity to flow smoothly, resulting in more than double the productivity.

Therefore, it was judged that this electrode can be used semi-permanently in the continuous re-tulle plating.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Claims (5)

In the indirect plating type continuous plating in which the electrode is not immersed in the plating solution, the cathode electrode in contact with the material to be plated is composed of a cemented carbide containing at least 80% to 99% of tungsten or tungsten and at least one of thorium, lanthanum, cerium, zirconium, And a tungsten alloy made by adding at least 1% to less than 20% of at least one metal to the negative electrode.
delete The cathode electrode device of claim 1, wherein the cathode electrode device is separable into a cathode electrode holder and a cathode electrode.
The negative electrode apparatus of claim 3, wherein the negative electrode holder is made of any one selected from tungsten, stainless steel, titanium, and zirconium.
The cathode according to claim 3, wherein the cathode electrode comprises a cemented carbide containing at least 80% to 99% of tungsten and tungsten in the form of a quadrangular or circular rod and at least one of thorium, lanthanum, cerium, zirconium, % Of the total weight of the negative electrode, and the negative electrode is made of a tungsten alloy.

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