JPS606439Y2 - Mother plate for metal electrodeposition - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mother plate for electrodeposition for electrodepositing metal, and particularly to a mother plate for electrodeposition suitable for obtaining electrodeposited metal having a nearly spherical shape.

In electrolytic refining of nickel, nickel cathode deposits are usually electrodeposited in the form of a flat plate with a thickness of about 10 m, so when used as an anode for nickel plating, they are generally formed into small pieces and filled into a titanium basket.

For this purpose, an electrodeposited nickel plate, for example 25rIrI
It is commercially available after being cut into n-square pieces.

However, in plating factories, these square pieces have sharp edges, so when filling titanium baskets, or when using them as anodes, they get caught on the basket's lath and hang on the shelf, creating voids inside the basket. The filling rate decreases, and the current is not evenly transmitted to the plating solution, which disturbs the current distribution and causes accidents such as scratches on the plated object.

In recent years, there have been many proposals for obtaining electrodeposited materials without cutting edges and without any corners. The method described in Japanese Patent Publication No. 1062 and Japanese Patent Publication No. 45-1706 is also used, in which a large number of circular or elliptical conductive metal surfaces are exposed on the surface of an electrically insulating flat plate, and this portion is shaped like a disk. Alternatively, JP-A-52-15283 and JP-A-52-13192 are used to deposit hemispherical electrodeposit.
There are also methods described in Japanese Patent Application Laid-Open No. 55-134185.

However, these products were far from spherical and did not have sufficient fluidity when placed in a basket.

On the other hand, as a method of obtaining completely spherical nickel, electrolytic nickel is melted in an electric furnace or the like and then cast, but this is expensive and is not used for anything other than very special purposes.

The present invention solves the above-mentioned problems and provides a metal electrodepositing base plate that can produce electrolytic nickel that is more spherical at a production cost similar to that of square, disk-shaped, or hemispherical electrodeposited nickel. It is.

This idea will be explained below with reference to the drawings. Figures 1 and 2 are diagrams showing an embodiment of a metal electrodeposition base plate according to this invention, in which 1 is a flat plate made of an electrically non-conductive material, and a large number of truncated cones are formed on both sides of the flat plate. The protrusions 2 of the shape are continuously formed of the same material.

Reference numeral 3 designates an electrode made of a conductive metal that protrudes from the truncated surface of the projection 2 and extends the cone of the projection 2.

Reference numeral 4 denotes an extension of the electrode 3 into the protrusion 2, which has a cylindrical shape and is fixed to a conductive metal plate 5 embedded in the flat plate 1 with screws.

In this embodiment, projections 2 are provided at the same position on both sides of a flat plate 1 made of a non-conductive material, and electrodes 3 are provided at the same position on both sides.
is continuous in the extension part 4, and is screwed into a screw hole provided in the conductive metal plate 5 by a threaded part 6 in the middle of the extension part 4.

Reference numeral 7 denotes a hanging arm of the flat plate 1 which is electrically connected to the conductive metal plate 5 and extends outward from the end face of the flat plate 1, and is suspended from a crossbar in the electrolytic cell by a bent portion formed at the end.

The flat plate 1 of non-conductive material is made of so-called plastic, which has a good fit, is inert to the electrolyte, is resistant to abrasion, has an expansion coefficient that is sufficiently compatible with the embedded metal, and does not allow the two materials to separate. Anything is fine.

Epoxy, polyurethane, polypropylene, polyethylene, acrylic, polyester, etc. can be used as such plastic.

Stainless steel and titanium are suitable materials for the conductive metal, and when these are used, the electrodeposited metal can be easily peeled off.

If the apex angle of the cone of the protrusion 2 provided on the surface of the flat plate 1 is an obtuse angle and becomes too large, the electrode 3, which serves as a cathode, will generally become large, making it difficult to obtain a nearly spherical electric sweep deposit.

On the other hand, if the apex angle of the cone of the protrusion 2 is too acute and too sharp, an electrodeposit close to a spherical shape can be obtained, but a large precipitate cannot be obtained and peeling becomes difficult, which is not preferable.

When the diameter of the base of the protrusion 2 provided on the surface of the flat plate 1 is increased, the number of electrodes 3 per unit area of the flat plate 1 decreases, and the height from the base of the protrusion 2 to the top surface (point) of the electrode 3 also increases. Therefore, the total thickness of the electrodeposition mother plate becomes large, and the pitch of the cathodes in the electrolytic cell becomes large, which is disadvantageous.

On the other hand, if the total height from the base of the protrusion 2 to the top surface (point) of the electrode 3 is too low, the entire cone becomes small, making processing complicated and resulting in a small electrodeposited product.

If the outer diameter of the base of the electrode 3 is made too small, when the initial current density is lowered below a certain value, the initial amount of electrodeposition will be small and efficiency will be poor, and if the current density is increased to increase efficiency, lump-like electrodes will appear. When it becomes a kimono, the shape of the final product becomes poor.

Therefore, generally speaking, the outer diameter of the base of the protrusion 2 made of non-conductive material is about 20 to 4-1. The total height from the base of electrode 2 to the top surface (point) of electrode 3 is 10 to 20 m.
About m is preferable.

The shape of the top of the electrode 3 does not necessarily have to be sharp;
Even if the tip is spherical as shown in Fig. 3a, or slightly truncated parallel to the flat plate 1 as shown in Fig. 3, or the exposed part of the electrode 3 is spherical as shown in Fig. 3C. It may be hemispherical, or it may be spherical with a height of about 1n of the diameter of the base of the electrode 3 as shown in FIG.

The extension portion 4 integral with the electrode 3 and the conductive metal plate 5 may be connected by any method such as screwing, welding, etc. as long as they are electrically connected.

The conductive metal plate 5 may be a simple flat plate or a lattice-shaped flat plate.

The position and number of protrusions 2 provided on the surface of the flat plate 1 are not particularly specified, but it is preferable to take care to ensure that the electrodeposited material can be obtained as efficiently as possible, and the number of protrusions 2 should be as large as possible and close to each other. It is desirable that you do so.

However, it is possible to increase the size of the base by adding a step in the middle of the slope of the cone of the projection 2, as shown in FIG.
The inclination of the electrode 3 and the inclination of the side surface of the electrode 3 may be changed as shown in FIGS. 5c and 5d, and these cases are also included in the present invention.

When electrolysis is carried out using the electrodepositing base plate according to the present invention, electrodeposited metal begins to precipitate on the surface of the electrode 3, and as the precipitation increases, the precipitation progresses and extends to the surface of the protrusion 2, as shown in Fig. 4. As shown in the cross section, the electrodeposited material is much more spherical than conventional products, so if you pull up the base plate at an appropriate time and apply a light impact to the electrodeposited metal, it will peel off easily and the product will be obtained. .

The initial current density is 2 to 15 A per surface area of the electrode 3.
It is preferable that dy<; if it is too large, lump-like electrodeposition will occur and the shape of the product will be poor.

According to the present invention, if the exposed surface of the electrode 3 is made large, it is possible to manufacture an electrode of about 200 g if the unit weight of one electrode is nickel or copper.

In addition, the mother plate for metal electrodeposition of this invention is not limited to nickel, but also copper,
Can also be used for zinc and other metals.

An example of use will be described below.

Usage example 1 One side of a stainless steel plate coated with ABS resin with a thickness of 2 rran is a truncated cone made of AS resin with a base diameter of 35 mm and a protrusion of 16 circles in height to the truncated head. Provided with a pitch of 3577I+71, and 5us3 on the top.
The base diameter of the cone made of 16 is 12 rran, and the tip has a radius of 3
A conical electrode with a height of 6Nn spherical at 1rgIL is exposed and electrically connected to the stainless steel plate, and on the other side is a conical electrode with a base diameter of 29rrrm and a height of 1 to the truncated head.
The dimensions of the 5US31 exposed conical electrode exposed at the top are the same as those for the other surfaces, and a nickel matte anode is used as the anode, and a nickel matte anode is used as the cathode. The distance between the anodes is 200wn, the mother plate for cathode electrodeposition is placed in the cathode box, the electrolytic waste liquid is purified, and the composition conditions of the electrolytic solution supplied to the cathode box are Ni So4 C7Na H3BO3 pH temperature 8
0125 65 40 10(1) 2.75 50～
At 70°C, the current density was initially 15 A/dd for 5 days, then 25 A/d- for the surface area of the electrode (1, M/piece).
The mold-deposited nickel was grown for 2 days.

After 7 days, the mother plate was pulled up and the electrodeposit was peeled off, resulting in a nearly spherical shape with a weight of 32.0 to 38.7 mm, as shown in the cross section in Figure 4.
g of electrolytic nickel was obtained.

Usage Example 2 Using the same metal electrodeposition base plate as Usage Example 1, and using the same electrolyte composition and conditions as Usage Example 1, the current density was calculated by changing the electrode surface area (1
,7C7+! /piece) at first 3A/d? 2 in 71″
Days, then? A/dd for 1 day, 9A/drIl for 1 day
1 day at 28A/d d y4, 50A/d d
When the electrodeposited nickel was grown for 8 days, 2 days at 20A/dd and 1 day at 20A/dd, it grew to a nearly spherical shape of 40.0 to 48cm.
．． 4 g of electrolytic nickel was obtained.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of an embodiment of the metal electrodepositing base plate according to the present invention, Fig. 2 is a longitudinal sectional view of Fig. 1, and Fig. 3 a, by.
C and d are side views showing four embodiments of the electrode, FIG. 4 is a cross-sectional view showing the state of metal electrodeposition on the metal electrodepositing base plate according to the present invention, and FIG. 5a is a side view showing four embodiments of the electrode. b, c, and d are side views showing other four examples of protrusion and electrode shapes. 1... Flat plate made of electrically non-conductive material, 2...
...Protrusion 1, 3...Electrode, 4...
・Extension part of 3, 5... conductive metal plate, 6...
...Threaded part, 7... Hanging hand.

Claims (1)

[Claims for Utility Model Registration] (↓) A large number of truncated cone-shaped protrusions are continuously formed on one or both sides of a flat plate made of electrically non-conductive material, and a protrusion is formed on the truncated top of the protrusion. A base plate for metal electrodeposition, in which a conical or hemispherical electrode with a base outer diameter of 4 to 2oR is continuously formed, and the electrode is bonded to a conductive metal plate embedded in the flat plate through a protrusion. (2) The outer diameter of the conical base of the protrusion is 20 to 4 orfr! n,
The outer diameter of the base of the electrode is 175 to 1/2 of the outer diameter of the base of the protrusion.
A metal electrodeposition base plate according to claim (1) of the utility model registration. (3) The total height from the base of the protrusion to the top surface (point) of the electrode is 1
The metal electrodeposition base plate according to claim (1) or (2) of the utility model registration claim, which has a molecular weight of 0 to 20 wn.