JPH0273998A - Electrode device for electrolyzing curved surface and method for electrolyzing metallic material using the same device - Google Patents

Abstract

PURPOSE:To conveniently electrolyze a metallic material having a curved surface with good reproducibility by impregnating an elastic body provided on an electrode with a liq. electrolyte or an electrolyte paste, attaching the body closely to the material surface, and applying a current between the electrode and the material. CONSTITUTION:An elastic member 1 having an optional curved surface is set on a supporting member 5, and a conductive layer 2 to be used as the electrode is formed thereon. The conductive layer 2 can be made of a conductive resin or metallic foil. A layer 3 (paste-impregnated layer) of an elastic body capable of being impregnated and infiltrated with a liq. electrolyte and/or an electrolyte paste is formed on the electrode, and a screen 4 is furnished on the surface, as required. The paste-impregnated layer 3 is impregnated with the liq. electrolyte or paste, and closely attached to a metallic material 7 having a curved surface such as a metallic dish fixed on a holder 6. A current is then applied between the electrode 2 and the material 7 through the paste. As a result, the surface of the material 7 is directly electrolyzed or through the penetrating-hole pattern of the screen 4, if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electrode device and an electrolytic treatment method for electrolytically treating the surface of a metal material, particularly an unspecified curved surface.

<Conventional technology> Conventionally, methods for performing fine electrolytic treatment on metal materials include:
There is a photoresist method (for example, Japanese Patent Publication No. 15705/1983) in which a portion of a metal material other than the portion to be processed is coated with a resist.

In addition, for metal cups, vases, plates, and other decorative metal products (crafts), there is a craftsman's manual technique called tsubumetsuki.

In the conventional photoresist method described above, (1) creation of an original image, (2) creation of an original plate by photolithography, (3) pretreatment of the surface to be processed, (4) application of a photosensitive liquid, and (5) 'B light. , (6
) development, (7) resist coating on surfaces other than the processed surface of the workpiece, (8) electrolytic treatment, (9) cleaning, (lO) resist removal, and (11) cleaning, drying, and finishing, which are extremely complex. There is a problem in that it requires a process, which inevitably leads to high costs.

In addition, the method of shaving has the disadvantage that it is labor-intensive and requires skill.

Regardless of which of the above-mentioned techniques is used, it is clear that it takes time and effort to electrolytically treat the surface of a metal material, especially an unspecified curved surface.

<Problems to be Solved by the Invention> The present invention solves the above-mentioned drawbacks of the prior art, and enables fine processing such as patterning, etching, plating, coloring, etc. even on unspecified curved surfaces by simple means. An object of the present invention is to provide an electrode device for electrolytic treatment of a curved surface that can be processed extremely clearly and with good reproducibility even when processing is difficult, and a method for electrolytic treatment of metal materials using the same.

<Means for Solving the Problems> The present inventors have conducted intensive research in order to eliminate the drawbacks such as the complexity of the above-mentioned conventional technology, and have developed an elastic material based on pads known as octopus printing. It was discovered that by impregnating and penetrating the pad with paste and installing electrodes inside it, electrolytic treatment can be performed with good reproducibility on the surface of metal materials, even on unspecified curved surfaces that are difficult to follow. This led to the present invention.

That is, the present invention provides a layer (hereinafter referred to as a paste-impregnated layer) on an electrode that is made of an elastic body and is capable of being impregnated with and permeable with an electrolyte solution and/or an electrolyte paste (hereinafter referred to simply as paste). An electrode device for curved surface electrolytic treatment is provided.

Further, it is preferable that the electrode is configured by providing a conductive layer on an elastic member.

Preferably, the conductive layer is made of conductive resin or metal foil.

Further, on the paste impregnated layer, it has electrical insulation properties,
It is preferable to have a perforated screen made of a material that does not react with the paste.

Preferably, the perforated screen is provided with a pattern to be electrolytically treated as through holes.

Further, the present invention provides the following steps: bringing an electrode device in which the paste-impregnated layer is impregnated with a paste into close contact with the surface of the metal material, and applying current through the paste between the electrode of the electrode device and the metal material; Provided is a method for electrolytically treating a metal material, characterized in that the surface is electrolytically treated.

Then, an electrode device in which the paste-impregnated layer is impregnated with paste is brought into close contact with the surface of the metal material, and electricity is applied between the electrode of the electrode device and the metal material through the paste, and the surface of the metal material is electrolytically treated. The present invention also provides a method for electrolytically treating a metal material, characterized in that an electrolytically treated pattern corresponding to the through-hole pattern provided on the screen is formed.

A detailed explanation of the present invention will be given below.

Metal materials to which the present invention can be applied include a wide range of metal products such as flat plates, cups, pots, and plates made of stainless steel, titanium, gold, silver, and copper, and laminated products with at least a metal surface.

In addition, the paste-like electrolyte (hereinafter simply referred to as paste) to be used differs depending on the intended treatment, but it can be used as a base for plating solvents. Using a solution containing a plating species such as mt&, for example, sodium polyacrylate,
Any type of paste made by adding organic thickeners such as sodium alginate and xanthan gum and/or inorganic thickeners such as zeolite, water glass, colloidal silica, colloidal alumina, and sodium silicofluoride. It is also possible to use products manufactured by the method.

Coloring pastes include alkalis such as sodium hydroxide, potassium hydroxide, ammonia, hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, hydrofluoric acid, chromic acid, dichromic acid, phosphoric acid, formic acid,
Using an aqueous coloring solution containing acids such as acetic acid, malonic acid, maleic acid, malic acid, tartaric acid, or salts of the above alkalis or acids alone or in combination, organic thickeners such as sodium polyacrylate, sodium alginate, xanthan gum, etc. are used. Any paste produced by adding an agent and/or an inorganic binder such as zeolite, water glass, colloidal silica, colloidal alumina, or sodium silicate fluoride can be used.

Etching pastes include alkali hydroxide soda, hydrochloric acid, sulfuric acid, nitric acid, chromic acid, dichromic acid,
Acids such as butic acid and/or the above-mentioned alkalis or salts of acids, alone or in combination, can be made into a paste as is or by adding water, as well as sodium polyacrylate, silicon dioxide, alumina,
Any paste produced by adding a pasting agent such as water glass or sodium alginate can be used.

It also has such tackiness and viscosity that it will not spread beyond the supplied width even if it is partially supplied onto the metal material. Therefore, even fine processing can be performed precisely.

Depending on the application, an aqueous electrolyte solution may also be used, but since an aqueous solution does not have tackiness, it is better not to use it in combination, as the aqueous solution will get between the screen and the metal material when creating patterns using a screen.

The patterned screen for electrolytic treatment used in the present invention may be a screen made of nylon, tetron, polyester, etc., which are usually used for screen printing, with a resist printed on them, as long as they do not react with the solvent for electrolytic treatment. It may be a sheet made of vinyl chloride, fluororesin, stainless steel, high N1 alloy, etc., which is stamped, and only the patterned portion for electrolytic treatment is provided with through holes through which the electrolytic treatment solvent can pass. Note that at least the surface layer of this screen must be made of an electrically insulating material.

In the present invention, the electrolytic treatment can include etching, plating, coloring treatment, etc. depending on the paste used and/or electrolytic conditions.

First, the electrode device of the present invention will be explained.

Two examples of the electrode device of the present invention are shown in FIGS. 1 and 2. The device shown in FIG. 1 has a conductive layer 2 serving as an electrode on an elastic member 1 having a flat or arbitrary curved surface, and an electrolyte solution and/or an electrolyte paste (including both) made of an elastic body. It has a layer (paste-impregnated layer) 3 of a substance that can crush and exude paste (referred to as paste).

What is shown in FIG. 2 is one in which a screen 4 is attached to the base impregnated layer 3 soil shown in FIG. screen 4
As mentioned above, depending on the purpose, intentional holes may be provided in the shape of a mesh, or mesh-like holes may be provided without any pattern. 5 is a support for these members.

When using the electrode device, it is preferable to supply the paste to the paste-impregnated layer or replace it when the paste is consumed or deteriorated.

The configuration example shown in Figures 1 to 3 is formed by providing a conductive layer 2 on the electrode and the elastic member, so the entire electrode device has great flexibility and can be used over a large area. It can be suitably used for electrolytic treatment of parts or parts with complex shapes.

On the other hand, the electrolytic treatment of a small area portion or a portion with a small curvature can be handled by forming the electrode itself from a rigid material and elastically deforming only the paste-impregnated layer 3. An example of this is shown in Figure 4.5.

A method of using the above electrode device will be explained with reference to FIG.

FIG. 3 shows a state in which a metal utensil 7 placed on a support stand 6 is about to be subjected to electrolytic treatment using the above-mentioned electrode device. Here, the electrode device may or may not have a screen 4 shown in dotted lines.

The electrode (conductive layer) 2 of the electrode device and the metal vessel 7 are connected to a power source by a current supply device (not shown).

The metal device 7 and the electrode 2 are energized through the paste in the paste-impregnated layer 3, and the metal device 7 undergoes an electrolytic treatment depending on the selected paste and screen6. Depending on the selection, etching, plating, coloring treatment, etc. are performed.

In addition, in electrode processing with a screen attached, if a perforated pattern such as letters, figures, pictures, etc. is attached to the screen, a corresponding pattern can be attached to the surface of the metal utensil. Unless a particular pattern is applied, the surface of the metal object is uniformly subjected to the above-mentioned electrolytic treatment.

Since the electrode device of the present invention has an elastic structure in its entirety or in a portion beyond the paste-impregnated layer, the electrode device can be made of a metal material even if the metal material is flat or has a complicated curved surface. Just by pressing it against the surface, it can follow those surfaces without deviation, and the patterns on the screen can also be faithfully reproduced on the surface of the metal material, making it possible to perform electrolytic treatment on an industrial scale.

Next, each component of the electrode device of the present invention will be described.

The elastic portion 1 may be made of synthetic rubber such as silicone rubber or urethane rubber, or natural rubber.

As the conductive layer 2 provided on the elastic member 1, any material may be used as long as it forms a flexible electrode that can follow the surface of the metal material, but it is preferable to use a four-conductor resin, metal foil, etc. can.

As the conductive resin, polyurethane to which carbon black or fine copper powder is added can be used, and as the metal foil, foils of stainless steel, titanium, platinum, nickel, etc. can be used.

As the paste impregnated layer 3, sponge, polyester,
Any material may be used as long as it can contain paste and is not adversely affected by it, such as woven or non-woven fabrics such as nylon and Teflon.

The screen is as described above.

Other configuration examples of the electrode device of the present invention are shown below.

FIG. 6 shows a squeegee-type electrode device.

FIG. 6a is a perspective view thereof, in which a bat 10 having a cross-sectional structure as shown in FIG. 6b is attached to a mounting member 12 having a handle 11. Further, although the pad 10 has a structure similar to that shown in FIG. 1, it may also have a screen as shown in FIG.

FIG. 7 shows a flat electrode device. The structure is substantially the same as that described with reference to FIG. 6, except that it is flat.

A screen may also be present on the outermost layer.

Further, a means for supplying paste to the base impregnated layer may be provided.

FIG. 8 shows a rolled electrode device. The structure is almost the same as shown in Figure 6.7 except that it is in a roll shape.
A screen may also be provided on the outermost layer.

The rolled electrode device shown in FIG. 8 may be provided with paste supply means as shown in FIG. 9.

The paste is supplied from the tube 13 to the base and impregnated layer 3 through holes 14 formed in the elastic body and the electrode 2.

A method of using the squeegee-type electrode device shown in FIG. 6 will be explained with reference to FIG. 10. The same applies to the flat plate-shaped electrode device shown in FIG. 7 and the roll-shaped electrode device shown in FIG.

Without stretching the screen 4 over the metal material 15 or extending the screen over the metal material 15, the electrode device shown in FIG. If electricity is applied through the metal material 15
is electrolytically treated via screen 4 or directly.

The type of electrolytic treatment and the action of the screen are exactly the same as described above.

<Example> Next, the present invention will be specifically explained by giving examples.

(Example 1) Using silicone rubber as the elastic member, using a conductive resin made of polyurethane with carbon black added as the Ti, using a polyester nonwoven fabric as the impregnated body, using nylon as the screen, photosensitive emulsion on the monofilament screen. A pad having a structure as shown in FIGS. 1 and 2 was fabricated using a plate having wavy-patterned holes formed therein by a plate-making method using a plate-making method.

Using these, attach T to stainless steel as shown in Figure 3.
When the flat plate on which i was vapor-deposited was subjected to color development treatment, a plate with a gold-colored wave pattern was obtained by electrolytic treatment for 10 seconds.

Coloring paste: Paste made by adding 3% polyacrylic acid to 10% sulfuric acid Electrolytic conditions: constant voltage electrolysis 15V, electrode - material to be treated +, scraping distance approximately 4 mm (Example 2) A screen similar to the above was used. An etching process was performed on a copper plate using the electrode assembly.

Etching paste + IO% sulfuric acid + 3% ferric chloride aqueous solution with 2% xanthan gum added Electrolytic conditions: constant current IA, electrode-1 material to be treated, electrode distance approximately 4 mm, electrolytic treatment for approximately 15 seconds I was able to obtain a copper vessel etched in a wave pattern.

<Effects of the Invention> Since the electrode device of the present invention has the elasticity to accurately follow the surface properties of the metal material to be electrolytically treated without shifting, it can be electrolytically treated to any shape of metal material. be able to. If a paste is used as an electrolytic treatment agent, fine treatment of the surface of a metal material can also be performed. By appropriately selecting an electrolytic treatment agent, a variety of treatments such as etching, plating, and coloring treatments can be performed.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are cross-sectional views of a configuration example of the tai device of the present invention. FIG. 3 is a partial sectional view showing a state in which electrolytic treatment is performed using the electrode device shown in FIG. 1.2. FIGS. 4 and 5 are cross-sectional views of an example of the structure of the electrode device of the present invention used when electrolytically treating a portion with a small curvature. FIG. 6a is a side view of a squeegee-type electrode that is an example of the configuration of the present invention. Figure 6b is a side view of the squeegee-type electrode. FIGS. 7 and 8 are side views of other configuration examples of the electrode snow making device of the present invention. FIG. 9 is a sectional view taken along the line ■ to ■ in FIG. 8. FIG. 10 is a schematic diagram showing how to use the squeegee-type electrode device. Explanation of symbols 1... Elastic member, 2... Conductive layer, 3... Paste impregnated layer, 4... Screen, 5... Support member, 6... Support base, 7... Metal plate, 10... Bat, 1... Handle, 2... Mounting member, 3... Tube, 4... Hole, 5... Metal material, FIG, 5 FIG, 7 ゝ-1

Claims (7)

[Claims] (1) The electrode is characterized by having a layer (hereinafter referred to as paste-impregnated layer) made of an elastic body that can be impregnated with and permeable with electrolyte solution and/or electrolyte paste (hereinafter referred to simply as paste). Electrode device for curved surface electrolytic treatment. (2) The electrode device for curved surface electrolytic treatment according to claim 1, wherein the electrode is configured by providing a conductive layer on an elastic member. (3) The electrode device for curved surface electrolytic treatment according to claim 2, wherein the conductive layer is made of conductive resin or metal foil. (4) having electrical insulation on the paste impregnated layer;
The electrode device for curved surface electrolytic treatment according to any one of claims 1 to 3, further comprising a perforated screen made of a substance that does not react with the paste. (5) The electrode device for curved surface electrolytic treatment according to claim 4, wherein the perforated screen is provided with a pattern to be electrolytically treated as through holes. (6) The electrode device according to any one of claims 1 to 4, wherein the paste-impregnated layer is impregnated with a paste, is brought into close contact with the surface of the metal material, and the paste is placed between the electrode of the electrode device and the metal material. A method for electrolytically treating a metal material, characterized in that the surface of the metal material is electrolytically treated by applying current through the metal material. (7) Bringing the electrode device according to claim 5, in which the paste-impregnated layer is impregnated with paste, into close contact with the surface of a metal material, and applying current through the paste between the electrode of the electrode device and the metal material; A method for electrolytically treating a metal material, comprising electrolytically treating the surface of the metal material to form an electrolytically treated pattern corresponding to a perforated pattern provided on the screen.