JPS6010114B2 - Mother plate for metal electrodeposition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base plate for electrodeposition for depositing metal, and more particularly to a base plate for electrodeposition suitable for obtaining a nearly spherical metal to be deposited.

In electrolytic refining of nickel, cathodic deposits of nickel are usually electrodeposited in the form of a flat plate about 1 inch thick, so when using this as an anode for nickel plating, it is generally formed into small pieces and filled into a titanium basket. There is.

For this purpose, electrodeposited nickel flat plates are cut into pieces of, for example, 25 ribs and sold commercially. However, in plating factories, these square pieces have sharp edges, so when filling titanium baskets or when using them as anodes, they can get caught on the lath of the basket and hang on the shelf, creating voids inside the basket. As a result, 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 plating defects on the object to be plated. In recent years, there have been many proposals for obtaining rounded kimono without cutting, such as Kimiaki Hakama (44), who regularly partitions a flat base plate with an insulator to obtain a small kasumi kimono, which can then be peeled off. The method described in Japanese Patent Publication No. 45-17062 and Japanese Patent Publication No. 45-17062 also involves exposing a large number of circular or elliptical conductive metal surfaces on the surface of an electrically insulating flat plate, and forming a disc-shaped part in this area. Alternatively, there are methods described in Mochiseki No. 52-152832, Mochiseki No. 52-131924, and Tokuseki No. 55-134185, in which hemispherical dragon kimonos are precipitated. However, these products were far from spherical and did not have sufficient fluidity when charged into a basket.On the other hand, in order to obtain completely spherical nickel, electrolytic nickel was melted in an electric furnace, etc. Although some are manufactured by casting, they are expensive and are not used for anything other than very special purposes.The present invention solves the above problems and produces electrodeposited nickel in square, disk, or hemispherical shapes. It is an object of the present invention to provide a mother plate for metal electrodeposition that can produce electrolytic nickel having a more spherical shape at a similar manufacturing cost. The surface of the metal is coated with an electrically non-conductive material, and the exposed conductive metal is placed at intervals along its longitudinal edge, and the long side or long diameter of the developed surface spanning the edge green and both sides is 2 to 15 willows. A plurality of the metal electrodeposition base plates are arranged in various shapes and arranged in a set between the anodes in an electrolytic cell to form a cathode. Spherical electrolytic nickel is deposited on the exposed parts of the conductive metal.

The present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are diagrams showing embodiments of a base plate for metal exposure according to the present invention, in which "1 is a strip-shaped conductive metal, the surface of which is coated with a coating 2 of an electrically non-conductive material. Exposed portions 3 of the conductive metal are formed by opening holes in the coating 2 at appropriate intervals at the ends of the conductive metal strips 1 in the longitudinal direction.
Reference numeral 4 denotes a hanging hand electrically connected to one end of a strip-shaped conductive metal, which is suspended from a crossbar in an electrolytic cell, thereby suspending this metal electrodeposition base plate and applying current to the exposed portion 3 as a cathode. can be precipitated.

The exposed portion 3 of the strip-shaped conductive metal 1 generally extends not only to the green end of the strip-shaped conductive metal vine but also to both sides, and its development surface is circular, hakama-shaped, oval, rectangular, etc. There are no restrictions. Stainless steel or titanium is suitable as the material for the strip-shaped conductive metal 1, and if these are used, the electrodeposited metal can be easily peeled off.

As the non-conductive material for the coating 2, any material may be used as long as it is convenient for molding, is inert to the electrolyte, is resistant to abrasion, and does not peel off. Such plastics include epoxy polyurethane, polypropylene,
Polyethylene, acrylic to vinyl chloride, polyester, etc. can be used. If the area of the exposed portion 3 of the strip-shaped conductive metal 1 is too small, large precipitates cannot be obtained and it is necessary to strip it more frequently.On the other hand, if the area of the exposed portion 3 is too small If it is too large, it is not preferable to obtain a precipitate that is close to a spherical shape, and the contact area between the precipitate and the strip-shaped conductive metal 1 becomes large, making it difficult to peel it off. In the case of a circular shape, the diameter is preferably on the 2 to i5 side, and in the case of other shapes, a similar size is preferred.The thickness of the plate of the strip-shaped conductive metal 1 is determined when the exposed portion 3 is suspended. The horizontal length of the conductive metal strip 1 is preferably 1'3 or more, and the thickness of the coating 2 is preferably 5 ribs or less, and as shown in FIG. It is also possible to make the surface of the coating 2 and the surface of the exposed portion 3 of the strip-shaped conductive metal turtle on the same plane.

Although the position and number of the exposed parts 3 provided on the mother plate for metal electrodeposition are not particularly limited, it is necessary to take care to obtain the Kame kimono in the most efficient manner. It is desirable that the number of precipitates be as large as possible and close to each other to the extent that they do not stick together.

In the embodiment shown in Fig. 2, the exposed parts 3 are arranged at equal intervals on each edge, and the exposed parts 3 appear alternately on one edge and the other edge, so that the deposits on both edges stick together. is prevented. If the size of the exposed part 3 of the strip-shaped conductive metal tortoise is made too small - when the initial current density is below a certain value, "the initial exposed amount is small and the efficiency is poor, so the current density is increased to increase the efficiency" If the size of the deposit is too large, it will not be possible to obtain a nearly spherical deposit and the peelability will be poor, which is undesirable. This is a diagram showing another embodiment of the electrodeposition mother plate, in which the horizontal sections of L strip-shaped conductive metal 11 are combined in a cross shape, and the surface thereof is coated with a non-conductive material 2. It is also the same as in the previous embodiment that an exposed portion 3 is formed at the longitudinal edge of the metal 1, and a hanger 4 is attached to the upper end of the metal 1 in connection with a strip-shaped conductive metal pole.

The edge of the strip-shaped conductive metal wing may have a semicircular horizontal cross section, or may have a triangular shape. The combination is not limited to the case where the horizontal cross sections are combined in a cross shape, but the horizontal cross sections can also be combined in a Y-shape, star shape to * shape, etc. When electrolysis is performed using the metal electrodepositing base plate according to the invention, "
At first, deposited gold begins to deposit on the exposed part 3 of the conductive metal,
Precipitation further progresses on the surface, but the precipitated metal eventually extends and grows on the surface of the non-conductive material, causing the "fifth metal" to grow.
The shape of the kimono grows as shown in the figure, and the result is a turtle kimono that is much more spherical than conventional products.If the mother plate is heated at an appropriate time and a light impact is applied to the electrodeposited metal, it can be easily peeled off. The product is obtained. The initial current density is preferably 2 to 5 M/dm<2 >with respect to the exposed surface area of the conductive metal; if it is too high, onion-like electrodeposition occurs and the shape of the product becomes poor. A plurality of base plates for metal electrodeposition according to the present invention can be suspended from a crossbar using hangers at appropriate intervals, positioned between anodes, and energized as a cathode to obtain a spherical electrodeposit.

However, it is convenient for operation if a plurality of electrodeposition motherboards are arranged under predetermined conditions and connected in a circular pattern to form an integrated metal electrodeposition motherboard. An embodiment of the integrated metal electrodepositing base plate will be described below.

FIG. 6 shows strip-shaped metal electrodeposition base plates arranged in parallel on the same line in a direction perpendicular to the anode. 5 is a rectangular electrodeposition motherboard, and the distance between adjacent motherboards is equal to or greater than the distance between the exposed parts 3 when the distance between the exposed parts 3 is designed to be the minimum so that the turtle kimonos do not stick to each other. I have given it.

In this example, a strip-shaped conductive metal 1 is bent into a U-shape at its center in the longitudinal direction, and its center portion 6 is attached to a connecting metal strip 7 with a bolt 8.
A hanging handle 9 is attached to the connecting metal strip 7 so that it can be suspended from a crossbar. A vinyl chloride pipe is passed through the lower part of the rectangular electrodeposition motherboard 5, and both ends are bolted using a vinyl chloride ring 10 as a spacer. By keeping adjacent base plates apart as described above, it is possible to prevent precipitates from sticking to each other. 7th
The figure shows the arrangement of the rectangular electrodeposition base plate 5 shown in FIG. 6 in a horizontal cross section. In the arrangement shown in the horizontal section in Fig. 8, the rectangular electrodeposition mother plates are arranged in a straight line parallel to the anode, and the distance between adjacent mother plates is 7.
As shown in the figure, the spacing is equal to or greater than the spacing of the exposed parts. The item shown in Figure 9 is one in which two sets of the items shown in Figure 8 are arranged parallel to the anode at the same relative position in the width direction of the anode, and the interval between the two sets is equal to or greater than the interval between the exposed parts. That is. No. **10
The figure shows two sets of the elements shown in Figure 8 arranged parallel to the anode, but arranged at alternate positions in the width direction of the anode, and the distance between the two sets is defined as the interval between the exposed parts. It is equal to or more than that. Figure 11 shows rectangular electrodeposition mother plates arranged parallel to each other at a 450 degree angle to the anode. It is sufficient if the height is higher than that, and the mother plates do not necessarily have to be parallel to each other. Figure 12 shows a cross-shaped combination of horizontal sections of conductive metal strips 1 arranged and electrically connected so that the cross is approximately 450 degrees from the anode. The distance from the edge is equal to or greater than the distance between the exposed portions. The angle formed by the cross with respect to the anode does not necessarily have to be 450 degrees. When the distance between the adjacent mother plates mentioned above is large, the distance between the exposed parts of the mother plate does not necessarily have to be as high as the distance between the exposed parts.
The key is that the spherical electrodeposit particles do not stick together. According to the present invention, if the unit weight of one piece is nickel or copper, the maximum weight is 6
It is possible to manufacture products with approximately 0 to 12 females.

Furthermore, the metal electrodeposition base plate of the present 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 A conductive metal strip made of SUS316 stainless steel with a thickness of 2 mm and a width of 3 mm is coated with vinyl chloride of a thickness of 0.5 mm to form a base plate for metal electrodeposition as shown in Figure 6. The exposed part of the conductive metal is provided on the development side with a diameter of 5 willow on the pitch 35 side, and the pitch of each strip-shaped conductive metal is 35 sails and the length is l.
I arranged 24 pieces of m.

The anode is a nickel mat with 975 vertical ribs, 755 vertical ribs, and 49 skin thickness, and the distance between the electrodes is 20 mm.The metal electrodeposition base plate is placed in the cathode box, and the electrolytic waste liquid is purified, and the cathode is heated. The composition conditions of the electrolyte supplied to the box are: Ni S04 01 Na 3B03 PH Temperature 80 125
65 40 10 g/1 2.76
The exposed area of conductive metal (approximately 0.2
Electrodeposited nickel was grown for 5 days at an initial current density of 10 A/d for the surface area of the electrodeposited material. .

After 12 days, the mother plate was heated and the electrodeposited material was peeled off, yielding nearly spherical electrolytic nickel with a diameter of 15 to 20 mm and a weight of 45 to 5 mm. The simple diagram of the drawing shows an embodiment of the metal electrodepositing base plate of the present invention.
Fig. 8 is a partial perspective view of the first embodiment; Fig. 2 is a side view of Fig. 1; Fig. 3 is a partial side view of the second embodiment, with the coating partially peeled off; FIG. 4 is a partial perspective view of the third embodiment;
Figure 5 is a side view showing the frayed condition. Figure 6 is a perspective view of the fourth embodiment, and Figures 1 and 2 show examples of the arrangement of the metal electrodeposition base plate in horizontal section. be.

2. Coating with electrically non-conductive material ~ 3... Exposed part t Year... Hanging hand ~ 5.
….

・Rectangular electrode base plate, 6...Central part 7...Connecting metal strip "8...Bolt" 9...Holder, turtle 0...
PVC ring. Figure ↑Figure 2Figure 3 GardenFigure 5Figure 4Figure 6Figure 6 Crocodile FigureFigure 8Figure 9Figure 10Figure 11Figure 12

Claims (1)

[Scope of Claims] 1. A coating of electrically non-conductive material is provided on the surface of a strip-shaped conductive metal, and the long side of the developed surface extends over the edge and both sides of the strip at intervals in the longitudinal direction. Or the major axis is 2-15mm
A mother plate for metal electrodeposition formed by forming an exposed part of a conductive metal. 2. The mother plate for metal electrodeposition according to claim 1, wherein the conductive metal strips are combined in a cross-shaped cross section.