JPH052610Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a basket-type anode chamber, and particularly to a basket-type anode chamber for electroplating that stores a granular or pellet-like metal body and uses it as an anode.
More specifically, the present invention relates to a basket-type anode chamber for electroplating, which is preferably suitable for chloride-based molten salt electroplating, and which stores a granular or pellet-like metal body and is used as an anode.

(Prior Art) Conventionally, a method is known in which a basket-type anode chamber is used for plating in an aqueous solution plating bath, and a metal pellet or the like is used as an anode. The surface of the casing constituting the anode chamber facing the cathode is porous and includes an electrolyte flow path and a current flow path. In aqueous plating baths, in many cases,
This housing is formed using metals that are easily passivated, such as Ti and stainless steel. In that case, the housing is galvanically protected as long as the pellets are soluble.

FIG. 1 is a schematic explanatory diagram showing an example of the structure of a accumulating tank using a conventional basket-type anode chamber.
FIG. 2 is a partial explanatory diagram of the structure of the basket-type anode chamber.

Steel materials to be plated 10 (hereinafter represented by steel plates)
is continuously charged into a plating tank 14 containing an aqueous solution plating bath or a molten salt plating bath 12;
The basket-shaped anode chamber 16 is arranged facing the surface of the steel plate. In the illustrated example, a total of two pairs of basket-shaped anode chambers 16 are provided for plating both sides of a steel plate. Steel plate 10 is conductor roll 1
8 to the cathode of a power source 20. On the other hand, the pellet metal body 22 stored in the basket-type anode chamber 16 is connected to the anode power supply section.

In the illustrated example, the pellet metal body 22 is connected to the housing 2.
4 and immersed in the plating bath 12, or the steel plate 1 constituting the cathode with the housing 24.
An electrolytic solution is filled between 0 and 0. In any case, the cathode facing surface of the casing 24 forming the anode chamber is constituted by a porous panel 26. This is to form an electrolyte flow path and a current flow path.

This porous panel 26 is made of a structural material strong enough to withstand the pressure generated by the weight of the pellet metal body, etc., but at the same time, it is made of a metal that becomes passivated because it is electrochemically polarized. Ru. Examples of metals that passivate in aqueous solutions include stainless steel,
Many are known, including Ni-based alloys and Ti. Since the pellet metal body 22 is reduced in diameter by melting, in order to prevent it from leaking or falling from the porous panel on the outer surface,
Furthermore, it is held by a screen 28 attached to the inside (see FIG. 2). This porous panel 26
Instead, it is also possible to use punched metal, which is a thin metal plate with many small holes that is easily passivated in an aqueous solution.

However, in the past, there have been examples of structures in which a porous panel on the outer surface is made of a metal such as Ti, and a screen is also made of a metal such as Ti, but in a molten salt electrolytic plating bath, such a structure is such that Ti is anodically dissolved. Therefore, it cannot be used.

Japanese Unexamined Patent Publication No. 57-161085 discloses an example of the structure of an anode chamber as a single-sided plating device in which the surface facing the cathode is made of mesh material. However, there is no suggestion as to the material, and rather, the device disclosed in this publication is a vertical type that maintains a constant distance between poles, instead of the conventional horizontal type, and also makes the flow of electrolyte uniform. It is intended that

(Problems to be Solved by the Invention) One object of the present invention is to provide a basket-type anode chamber for electroplating that can withstand long-term continuous operation.

Another object of the present invention is to provide a basket-type anode chamber suitable for chloride-based molten salt electrolytic plating.

(Means for solving the problem) In molten chloride salt, metal materials such as W and Mo materials and mesh materials such as glass cloth materials can be used as screen members. The screen members used for this purpose are generally knitted into a net shape, but they are weak in terms of strength and structure, and are prone to deformation and damage due to uneven surface pressure from metal pellets, etc. Leakage of pellets that were melted and reduced in diameter during operation;
prone to falling.

Therefore, the inventors of the present invention not only have an outer panel, but also
We devised a method to prevent the surface pressure of the pellets from being applied directly to the screen member by arranging the inner plate as a porous panel.

Here, the gist of the present invention is that it consists of a housing that houses a granular or pellet-like metal body used as an anode, and the surface of the housing that faces the cathode is composed of a double porous panel. , a mesh-like screen member is interposed between the porous panels, and at least the porous panel on the side closer to the cathode of the double porous panels is an insulator or a metal body covered with an insulator. This is a basket-type anode chamber for electroplating consisting of:

In a preferred embodiment of the present invention, the net-like screen member is made of Mo or W. If necessary, they may all be constructed of mesh material such as glass cloth.

(Function) Next, the present invention will be further explained in detail with reference to the drawings. FIG. 3 is a schematic explanatory diagram of a basket-type anode chamber according to the present invention, and FIG. 4 is a schematic front view thereof. Note that the same members as in FIGS. 1 and 2 are indicated by the same symbols.

In the figure, a pellet-like metal body 22, which is an anode metal, is housed in a housing 24 and faces a steel plate 10 that constitutes a cathode. The outermost surface of the casing 24 constituting this opposing surface has double porous panels 26, 26.
, with a screen 28 sandwiched between them. The other side of the housing 24 may be comprised of an insulator 32, which may optionally be surrounded by an insulating lining (not shown).
The porous panel 26 on the outer surface and the porous panel 26 on the inner surface form an opening 34 to form a flow path for electric current, etc. In FIG. 4, only some openings are shown.

In order to operate continuously, the pellet-like metal bodies 22 may be added and thrown in from the upper part of the housing 24 through an appropriate inlet as the metal particles settle as they melt.

According to the present invention, since the porous panel 26 has a double structure, it can sufficiently support the weight of the pellet-like metal body 22 in terms of strength. It also functions as a reinforcing material for 28.

For example, in the case of molten salt electrolytic plating, the screen 28 may be made of a metal material such as W or Mo coated with an anti-corrosion coating if necessary, or a glass woven fabric, and the porous panel 26 may be made of a ceramic sprayed material or the like. may be configured.

In particular, in a preferred embodiment of the invention, the inner panel is made of Ni or a Ni-based alloy, while the porous panel on the side closer to the screen and cathode is made of a ceramic insulator. Ni or Ni
By using a base alloy, not only strength but also impact resistance is significantly improved.

It is sufficient for those skilled in the art to appropriately select the thickness of the porous panel, the dimensions and distribution of the openings, as well as the mesh of the screen, etc., depending on the type of intended plating, the required strength, etc.; There are no restrictions.

Although the present invention shows particularly remarkable effects in molten salt electroplating, it is obvious that it can also be applied to aqueous solution electroplating.

[Brief explanation of drawings]

1 and 2 are schematic explanatory diagrams showing an example of a conventional basket-type anode chamber; and FIGS. 3 and 4 are schematic explanatory diagrams showing the structure of a basket-type anode chamber according to the present invention. . 22... Metal body, 24... Housing, 26... Porous panel, 28... Screen, 32... Insulator, 34... Opening.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a casing that houses a granular or pellet-like metal body used as an anode, the surface of the casing facing the cathode is composed of a double porous panel, A net-like screen member is interposed between the porous panels, and at least the porous panel on the side closer to the cathode of the double porous panels is made of an insulator or a metal body covered with an insulator. A basket-shaped anode chamber for electroplating. (2) The net-like screen member is made of Mo or W.
A basket-type anode chamber for electroplating as set forth in claim 1 of the utility model registration, comprising: