JPS61201799A - Soluble anode for electroplating device - Google Patents

Abstract

PURPOSE:To uniformize the distribution of the amount of a metal deposited on a material to be plated and to improve the quality by shaking metallic granules for plating packed into an anode box to increase the rate of packing when the metallic granules are packed into the anode box to form a soluble anode. CONSTITUTION:An anode box is composed of an anode frame 24, a porous member 25 and anode support members 10, and electrically conductive terminals 6 are fastened to the anode frame 24 with bolts 7. A shaft 11 is rotatably set through the anode frame 24 with bearings 13. Since the shaft 11 has projections 12 on the surface, when the shaft 11 is alternately rotated clockwise and counterclockwise through a bracket 15, metallic granules 8 for plating in the anode box are shaken to increase the rate of packing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a soluble anode for an electroplating apparatus in which an anode box is filled with metal particles for plating.

<Prior art and its problems> Conventionally, the method of electroplating is to use the plating metal as an anode, the material to be plated as a cathode, electrochemically melt the anode, and perform plating while replenishing plating metal ions. There is a way. Anodes used in such plating methods are generally referred to as soluble anodes. As the soluble anode, there are two methods: one uses plated metal processed into an ingot or plate shape, and the other uses metal particles filled in a basket.

The present invention relates to a method of plating by filling a basket with metal particles as a soluble anode, but as a conventional plating technique for this method, a steel strip is plated using a vertical plating device. The case will be explained using FIGS. 1 to 4 as an example.

In FIG. 1, a steel strip 2 is wound around a normal roll (cathode) 3 and a zinc roll 4, and a soluble anode 1 is placed between the zero current-carrying roll 3 and the zinc roll 4, which are conveyed in the direction a. It is installed on both sides of 2. The soluble anode 1 is supported on the wall surface of the tank 5 by a support member 10. The soluble anode 1 and the zinc roll 4 are immersed in a plating solution 9 stored in a tank 5. A current-carrying terminal 6 is installed on the soluble anode 1, and by applying a DC voltage between it and the current-carrying roll 3, plating is performed on the surface of the copper strip.

2 and 3 are detailed views of the soluble anode, and FIG. 3 shows a side view of FIG. The anode box has an anode frame 24
and a member 25 having porous holes to form a box-like structure, and metal particles 8 are filled in the box, as shown in FIG. As the porous member, titanium lath steel or the like is used. Problems with such conventional techniques will be described below.

Problems encountered when performing plating using such a plating apparatus will be explained using FIG. 4. As plating is performed, the metal particles 8 in the anode near the wall surface of the porous member 25 are electrochemically dissolved, the particle size becomes smaller, and a gap 26 (see Fig. 4) is formed between the porous member 25 and the metal particles 8 in the anode. ) occurs. Or
Even when filling the anode box with metal particles, the filling may not be completed completely and gaps may occur. In order to solve this problem, there is an example of using a metal particle stirring rod that rotates continuously as shown in Japanese Patent Application Laid-Open No. 58-1099. However, because of the continuous rotation, the rotation of the stirring rod is This caused the problem that the grains were locked and could not be rotated, resulting in the metal grains not being completely filled. In such a state, the distance between the steel strip 2 shown in Fig. 1 and the metal grains facing the copper strip in the anode box becomes uneven, which causes non-uniformity in the current density within the anode surface. This leads to non-uniformity in the coating weight distribution of the steel strip to be plated.

<Purpose of the Invention> The present invention was made to solve these problems seen in the prior art, and it increases the filling rate of the metal particles by giving rocking motion to the metal particles. It is an object of the present invention to provide a soluble anode for an electroplating device that can maintain a constant interval between plating materials and a constant plating thickness.

<Structure of the Invention> The present invention provides a soluble anode for an electroplating apparatus in which an anode box equipped with a current-carrying terminal installed in a plating solution is filled with plating metal particles. A shaft formed by establishing a shaft is rotatably inserted through the shaft,
The present invention provides a soluble anode for an electroplating apparatus, characterized in that the shaft is connected to an oscillating rotation device that alternately rotates forward and reverse.

The present invention will be explained using FIGS. 6 to 9. 6 and 7 show the case where the present invention is applied to a vertical type plating apparatus, and FIGS. 8 and 9 show the case where the present invention is applied to a radial type plating apparatus.

First, the vertical plating apparatus will be explained using FIGS. 6 and 7. FIG. 6 shows the soluble anode of the vertical plating tank, and FIG. 7 is a BB view of FIG. 6. shows. The anode box is composed of an anode frame 24, a porous member 25, and an anode support member 10, and an energizing terminal 6 for energizing the anode frame 24 is connected to the anode frame 24 at a port 7. It has been concluded.

On the other hand, a shirt 11 is inserted through the anode frame 24 and is attached to the anode frame 24 so that it can swing and rotate. The bearing 13 is attached to the anode frame 24 at a port 14. A protrusion 12 is provided on the surface of the shaft of the shirt (shirt) 11, and by applying rocking rotation to the shaft, that is, alternately applying forward and reverse rotation to the shaft, force is applied to the metal grains in the anode box, and the metal particles are grains can be moved.

The shirt 11 is installed in the tank 5 via a seal 22 to prevent the liquid in the tank from leaking. A swinging and rotating device as illustrated in FIG. 7 is connected to one end of the shaft 11. As shown in FIG. This swinging rotation device is composed of a bracket 15, a driving cylinder 18, a clevis 16, and a pin 17 that connects the bracket 15 so as to be swingable and rotatable. The driving cylinder 18 is connected via a pin 19 to a bracket 20 installed on a tank or other frame 21 (not shown).

Here, oscillating rotation refers to alternately rotating the shaft in the forward and reverse directions.

When the metal particles 8 are filled into the anode box described above,
During initial filling, a gap 26 may be created between the porous member 25 and the metal particles 8 during plating.
By electrochemically dissolving the material, a gap is created between the material and the porous member 25. In this state, when the shaft 11 is alternately oscillated in the C-D direction by the driving cylinder 18, the metal particles in the anode box are oscillated by the protrusions 12 installed on the outer peripheral surface of the shaft, and the above-mentioned gap is oscillated. can be completely eliminated.

As shown in FIG. 5, the initial filling rate of metal grains is higher in curve H using oscillating rotation as in the present invention than in curve work using continuous rotation or axial oscillation. Note that the X mark indicates when the shirt (shirt) 11 is locked.

Next, a case where the present invention is applied to a radial type plating apparatus will be explained using FIGS. 8 and 9.

FIG. 8 is a drawing explaining the radial type plating apparatus, and FIG. 9 is a parent view taken along line EE of FIG. 8, and is a drawing explaining the details of the soluble anode box.

In FIG. 8, the steel strip 2 is wound around a current-carrying roll (cathode) 3 and a rotating roll 23, and is conveyed in the direction a. A soluble anode 1 is installed facing the rotating roll, and the soluble anode is immersed in a plating solution 9 stored in a tank 5. The soluble anode 1 is made up of an anode frame 24, a porous member 25, a current-carrying terminal 6, an anode support member 10, a shaft with protrusions erected on its outer peripheral surface, and an oscillating rotation device, similar to the vertical plating apparatus. The anode box is filled with metal particles 8. In such a configuration, the surface of the steel strip 2 is plated by applying a DC voltage to the current-carrying roll and the anode 1 from a rectifier (not shown).

FIG. 9 shows the parent diagram EE in FIG. 8, showing details of the soluble anode, and the shaft 11 is installed in the anode box as in the vertical plating apparatus. The structure of the swinging rotation device is exactly the same as that of the vertical plating device.

In the present invention, an oscillating rotation device using a cylinder has been described as a drive device for the shaft 11, but the present invention is not limited to this, and any device may be used as long as it can impart oscillating rotation to the shaft. Further, although the present invention has described a plating method in which a steel strip is used as the material to be plated, it goes without saying that the soluble anode according to the present invention can be employed in plating rolls, shafts, etc.

In the present invention, an example has been described in which one shaft is installed in the anode box, but the invention is not limited to this, and a plurality of shafts may be installed.

In the present invention, as members constituting the anode box,
A porous member is used, but the role of this member is to
It is constructed so that metal particles are electrochemically dissolved during plating, and the metal ions can move to the outside of the soluble anode.
In addition, any material may be used as long as it can withstand the lateral pressure from the metal particles in the soluble anode, is not corroded by the plating solution, and has insulation properties. The reason why insulation is required is to prevent the porous member from dissolving during plating when an electrochemically soluble metal is used. As a member with pores.

For example, titanium lath steel, punched metal whose surface is coated with a resin-based insulating material, cloth, etc. are effective.

<Effects of the Invention> According to the present invention, the filling rate of metal particles in the anode box for stirring and filling the metal particles with the projections on the shaft is improved by rotating the shaft, and the distance between the anode and the material to be plated is reduced. Since gi (distance between poles gl) can be kept uniform at all times, it is possible to make the distribution of area weight of the material to be plated uniform, which contributes to quality improvement.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic partial cross-sectional view illustrating a conventional technique. FIG. 2 is a parent view taken along the line AA in FIG. 1, and FIG. 3 is a side view of FIG. FIG. 4 is a diagram illustrating the problems of the prior art. FIG. 5 is a diagram illustrating the effects of the present invention. FIG. 6 is a schematic partial sectional view showing one embodiment of the present invention. FIG. 7 is a BB parent diagram of FIG. FIG. 8 is a diagrammatic sectional view showing another embodiment of the present invention. FIG. 9 is an EE parent diagram of FIG. 8. Explanation of symbols 1... Soluble anode, 2... Steel strip, 3... Current roll, 4... Zinc roll, 5... Tank, 6...
Current-carrying terminal, 7... Bolt, 8... Metal particles for plating,
9... Plating solution, 10... Support member, 11...
・Shaft, 12...Protrusion, 13...Bearing, 14・
... Bolt, 15... Bracket, 16... Clevis, 17... Pin, 18... Drive cylinder, 1
9...Bin. 20... Bracket, 21... Frame, 22... Seal, 23... Rotating roll, 24... Anode frame, 2
5... Porous member, C, D... Rocking rotation direction, 26.
...Gap FIG, 5 Axis rotation wheel is Otakan Kaiaki FIG, 6 FIG, 7 FIG, 8

Claims (1)

[Claims] In a soluble anode for electroplating equipment, which consists of an anode box equipped with a current-carrying terminal installed in a plating solution and filled with metal particles for plating, a shaft made of a protrusion formed on the outer circumferential surface of the anode box can be rotated. What is claimed is: 1. A soluble anode for an electroplating apparatus, characterized in that the anode is inserted through the shaft and connected to an oscillating rotation device that alternately applies forward and reverse rotation to the shaft.