JP2510807Y2 - Anode for electroplating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a metal anode used for continuous electroplating of steel sheets and the like.

(Prior Art) When a steel plate or the like is electroplated with iron, zinc, tin, copper, nickel, chromium, or an alloy thereof, a consumable electrode has been used as an anode.
After that, an insoluble electrode containing lead as a main component was usually used. Recently, an insoluble electrode in which a titanium plate or the like is coated with a platinum group metal or its oxide is being put to practical use.

(Problems to be solved by the invention) However, an electrode in which a titanium plate or the like is coated with an anode active material such as a platinum group metal is excellent in insolubility, but the electrode used for steel plate plating is very large and heavy. Therefore, it takes a great deal of labor to perform re-plating due to peeling of the anode active material, and since the entire surface is plated, the amount of the active material becomes large and the cost becomes economically expensive.

(Means for Solving the Problem) The present invention is to solve the above problems, that is, an electroplating anode obtained by welding a porous metal electrode onto an insoluble metal plate.

The present invention will be described with reference to the drawings. A porous metal electrode (2) is formed on one surface (opposite surface of a cathode) of an insoluble metal plate (1) similar to the shape conventionally used as an anode plate in FIGS. 1 and 2. To be used as an electroplating anode (A).

Examples of the insoluble metal plate include a titanium plate, a zirconium plate, a tantalum plate, a niobium plate, a silver plate and the like, or an iron plate or a copper plate coated with a surface of titanium, zirconium, tantalum, niobium, silver or the like. The shape of the porous metal electrode is normal expanded metal, punching metal, mesh,
It is possible to adopt various porous shapes such as an umbilical shape. The material of the porous metal electrode is usually a porous substrate of titanium, zirconium, tantalum, niobium or silver provided with a coating layer of a platinum group metal and / or its oxide.

To weld the porous metal electrode (2) to the insoluble metal plate (1), ordinary welding and spot welding may be used. FIG. 3 shows an example of the electroplating method using the anode of the present invention, in which the anode (B) made of only porous metal is placed on the upper side of the steel plate (3) continuously conveyed in the plating bath. The anode (A) of the present invention is arranged on the lower side. By disposing the anode (B) made of only a porous metal in the upper part, it is possible to easily deviate the gas generated from the anode. The mode of use of the anode of the present invention is not limited to such a horizontal type electroplating apparatus, and can of course be used in a vertical type electroplating apparatus.

(Effect of the Invention) Since the anode of the present invention is configured as described above, the following effects are produced.

1) Since the porous electrode has many edge portions, the apparent current distribution tends to be more uniform than that of the plate electrode. Therefore, the opposing steel plate plating is made uniform.

2) When repairing the electrode, it is necessary to take out a heavy plate-shaped body for the plate-shaped electrode and repair the entire body. In the anode of the present invention, only the porous electrode portion welded to the plate-shaped member needs to be replaced, which is extremely simplified and economical.

3) In the conventional plate-shaped electrode, the plate-shaped body itself had to be heated and baked at 400 to 700 ° C in order to coat the substrate with the platinum group metal or its oxide, but in the anode of the present invention, the porous electrode portion was used. Since such firing may be performed only on the other side, the heat capacity is small and efficient.

[Brief description of drawings]

FIG. 1 is a bird's eye view illustrating an anode of the present invention, and FIG. 2 is a schematic side view of the anode. FIG. 3 is an explanatory view showing an example of a method for plating a steel sheet using the anode of the present invention. (1) …… Insoluble metal plate (2) …… Porous metal electrode (3) …… Steel plate

Claims (5)

(57) [Scope of utility model registration request] 1. An electroplating anode comprising a porous metal electrode deposited on an insoluble metal plate. 2. The anode for electroplating according to claim 1, wherein the insoluble metal plate is a titanium plate, a zirconium plate, a tantalum plate, a niobium plate or a silver plate. 3. The anode for electroplating according to claim 1, wherein the insoluble metal plate is an iron plate or a copper plate having a surface coating layer of titanium, zirconium, tantalum, niobium or silver. 4. The porous metal electrode comprises titanium, zirconium,
The electroplating anode according to claim 1, wherein a coating layer of a platinum group metal and / or a platinum group metal oxide is provided on a porous substrate of tantalum, niobium or silver. 5. The electroplating anode according to claim 4, wherein the porous substrate is an expanded metal, a punching metal, a net-like material or a garnet-like material.