JPS6032123Y2 - Plating equipment using ball-shaped anodes - Google Patents

Description

[Detailed description of the invention] The present invention is a plating device that uses a ball-shaped anode, in which a net-like filling is placed on the bottom of a basket-shaped case that stores the ball-shaped anode, and the ball-shaped anode is stored on top of the net-like filling. Both the case and the filling are made of a material that has good conductivity and is inert to the electrolyte.

The purpose of this is to place a net-like filling on the bottom of the anode case and store the ball-shaped anode on top of it, thereby preventing the decrease in porosity in the lower part of the case. This improves the fluidity of the electrolyte, increases electrical efficiency, and improves plating work efficiency.

The electrolytic plating method that uses a ball-shaped anode and a basket-shaped anode case has the following advantages compared to a method that uses a lead hanger with a plate-shaped anode mounted on a comb-shaped support. be.

(1) The surface area per unit weight is large, so the weight of the anode placed in the electrolyte tank is small.

(2) By sequentially replenishing the anode case with ball-shaped anodes, fluctuations in the anode area can be kept within a small range.

(3) In the case of a plate-shaped anode, 30 to 40% becomes scrap, but in the case of a ball-shaped anode, 100% can be used.

(4) Work efficiency can be increased by limiting the time required for replacing and adjusting the anode.

However, although it has the above-mentioned advantages, it has the disadvantage that the electrical effect is slightly inferior compared to those using a plate-shaped anode.

The reasons for this are: (1) Since titanium is generally used as the material for the anode case, the electrical resistance is more than twice as high as that of a lead hanger that uses a conventional plate-shaped anode (Ti55x 10- 'Ω・Bei.

Pb21 x tO−'Ω・o).

However, this problem can be largely solved by plating the titanium case with platinum (PtlO, 6x lo
-6Ω*cm).

(2) This is due to the fact that the ball-shaped anodes are crowded together within the basket-shaped case.

That is, as the ball-shaped anode melts, it descends and
Anodes with very small diameters are densely packed at the bottom of the case, filling the void inside the case, blocking the flow of electrolyte,
By reducing the liquid stirring efficiency, electrical efficiency is reduced.

This condition is illustrated in Figure 5, where small diameter anodes are clustered together at the bottom of the case, which prevents electrolyte flow and good contact between the electrolyte and the anode. .

Particularly in electroplating using high current density, the stirring state of the liquid is a major factor, and poor stirring is known to cause an increase in liquid resistance.

The present invention has been improved to solve the second drawback mentioned above.

That is, in the basket-shaped case of the ball-shaped anode,
This problem was solved by adding a net-like filling made of a material that is conductive and inert to the electrolyte and can be housed in the case.

That is, by combining the case and the net-like filling placed on the bottom of the case, the flow of the electrolytic solution is promoted and good contact between the solution and the anode is achieved.

The drawings will be explained below.

The basket-shaped case 1 of the ball-shaped anode a has a side plate 6° 7 sandwiched between an L-shaped horizontal rod 4 attached to the hanging plates 2 and 3 and a corresponding L-shaped horizontal rod 5 on the front side. With,
A net 9 is stretched on the front and rear surfaces of a framework with a bottom plate 8 attached to the bottom surface.

These constituent materials are made of titanium material that has good conductivity and is inert to the electrolyte, or titanium material plated with platinum.

Note that the symbol 2Z4/ in FIG. 5', 8', 9'
shows the corresponding part in FIG.

The filling 10 that is then placed on the bottom of the case 1 has a length of 8
It is a tubular mesh with a diameter of about 25 mm.

The filler 10 is preferably made of titanium or a titanium material plated with platinum, since it will dissolve and deform unless it has high conductivity and is inert to the electrolyte. In order to avoid being crushed by the accumulated weight of 1~2rIr! It is desirable to wind the net formed of filaments with a diameter of n two or three times to form a cylindrical shape.

If the size of the mesh is too large, the ball-shaped anode a with a small diameter will enter the filling 10 and fill the void, whereas if the mesh is too small, the contact area between the electrolyte and the anode a will be reduced. As a result, the fluidity of the electrolytic solution is lost and electrical efficiency is reduced.

This is why it is necessary to select a suitable mesh reticulation.

What is shown in Fig. 4 is 10.3 pieces of this tubular mesh filling (3 pieces in the cross-sectional view, but actually about 20 to 3 pieces).
is placed on the bottom of the case 1, and the ball-shaped anode a, which has become smaller in diameter due to melting and descended, is accumulated around the tubular net-like filling 10, but does not enter inside thereof. A decrease in porosity in the lower part is prevented.

This increases the contact area between the different phases (ball-shaped anode a and electrolyte) where electrolyte transfer takes place, and improves the fluidity of the electrolyte, increasing the efficiency of stirring the solution and improving electrical efficiency. becomes.

As described above, the present invention can be used as a plating device by combining a basket-like case with a ball-shaped anode and a net-like filling placed on the bottom of the case to prevent the porosity from decreasing. The small-diameter ball-shaped anode does not reduce the porosity accumulated at the bottom of the basket-shaped case, improving the fluidity of the electrolyte and increasing electrical efficiency, thereby reducing the time required to replace and adjust the anode. Reduce waist and can increase work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front view of a basket-shaped case in the device of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a perspective view of a tubular mesh placed on the basket-shaped case, and Fig. 4 is a book FIG. 5 is a cross-sectional view showing the device of the invention in use. FIG. 5 is a cross-sectional view of FIG. 4 with the tubular mesh removed. Code, a...Ball-shaped anode, 1...
・Basket-shaped anode case, 2, 3... Hanging plate, 4゜5... L-shaped horizontal rod, 6, 7...
・Side plate, 8...Bottom plate, 9...Net,
10... Tubular mesh filling.

Claims (2)

[Scope of utility model registration request] (1) At the bottom of the basket-shaped anode case made of a material with good conductivity and inert to the electrolyte,
A plating apparatus that uses a ball-shaped anode, in which a tubular or wound mesh-like filling made of the same material as the anode case is placed, and a ball-shaped anode is housed above the filling. (2) The material having good conductivity and being inert to the electrolyte is a titanium material or a titanium material plated with platinum.Plating using a ball-shaped anode according to claim 1 of the utility model registration claim. Device.