JP2578498B2 - Electrolytic treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a highly efficient and simple method for electrolytic treatment of metal surfaces such as removal of oxide scale, electrolytic polishing, passivation treatment, coloring treatment, and electroplating. The present invention relates to an electrolytic treatment apparatus to be performed.

<Prior Art> Conventionally, treatments applied to a metal material surface include descaling, surface polishing, passivation treatment, coloring treatment, plating and the like.

Such metal surface treatment methods include mechanical,
There are methods such as chemical and electrochemical treatment. However, these conventional processing methods have the following disadvantages.

For example, for descaling, there is shot blasting as a typical method of mechanical processing, but there are environmental problems such as generation of dust and noise, and it is difficult to perform on-site processing in which processing is performed directly at the processing site. In addition, there is a disadvantage that the work hardened layer remains on the surface, which adversely affects corrosion resistance or mechanical properties.

Further, in the chemical treatment method, there is a descaling treatment by so-called pickling, but the treatment has a long time,
There is also an environmental problem due to the use of an acid solution, and there is a disadvantage that on-site treatment is difficult. In recent years, an in-situ pickling treatment method using a pickling paste has been performed, but it has a drawback that a long-time treatment is required and that pickling unevenness easily occurs.

As the electrochemical treatment method, there is a descaling treatment by so-called electrolytic pickling, and the treatment can be performed in a short time, but the treatment solution and the treatment equipment are greatly restricted, and the disadvantage that the treatment on site is difficult is also difficult. there were. In the electrochemical treatment method, it is important to always keep the surface of the treatment electrode clean in order to obtain an excellent surface treatment product with good current efficiency, and improvement has been desired.

<Problems to be Solved by the Invention> An object of the present invention is to solve the problems of the conventional technique, and among the surface treatment methods for metal materials, a particularly efficient and high-quality surface treatment is possible. Applying the electrochemical treatment method, eliminating the decisive disadvantage that in-situ treatment is not possible, and striving to improve the electrode and the paste supply system for surface treatment which is a treatment liquid, and to stabilize it An object of the present invention is to provide an electrolytic processing apparatus capable of performing high-quality surface treatment by using a current.

<Means for Solving the Problems> In order to solve the above problems, the present inventors have realized that various electrochemical surface treatments can be performed on site by using a paste electrolyte as a processing solution. To become a. Furthermore, in electrolytic treatment, especially electrolytic plating, coloring treatment, etc., it is necessary to obtain good current efficiency in order to obtain excellent surface treatment products, and it is necessary to keep the electrode surface always clean for that purpose. After intensive studies, the present invention was accomplished.

That is, the present invention is an electrolytic treatment apparatus for treating the surface of a metal material with a paste for surface treatment, comprising: a hollow cylindrical electrode roll having a plurality of outlets for the paste for surface treatment on an outer peripheral surface; An electrode roll drive system for driving a roll; a surface treatment paste supply system for supplying the surface treatment paste into the electrode roll; and the surface treatment that fits the electrode roll and flows out of the outlet. Impregnated with a paste for leaching on the outer peripheral surface,
A cylindrical pad that comes into contact with the metal material, a pad drive system that relatively rotates the pad with respect to the electrode roll, and a unit that energizes the electrode roll and the metal material via the paste for surface treatment. The present invention provides an electrolytic processing apparatus characterized in that:

According to the electrolytic treatment apparatus of the present invention, a paste-like surface treatment paste is used as a surface treatment agent, and the surface treatment paste is supplied from a cylindrical electrode roll having an outlet to the pad and the surface of the metal to be treated. Since the electrode roll and the pad rotate relative to each other, a current is applied between the electrode roll and the metal to be processed through the surface treatment paste, and one or both surfaces of the metal to be processed are electrolytically processed, so that in-situ processing is possible. Moreover, the surface of the electrode roll can always be kept clean by the pad.

Therefore, according to the electrolytic treatment apparatus of the present invention, by selecting the surface treatment paste and the pad, various electrolytic treatments can be efficiently performed at low cost, and can be always performed with a stable current, and high quality. It is possible to obtain a surface-treated product.

Hereinafter, the electrolytic processing apparatus of the present invention will be described in detail.

The electrolytic treatment apparatus of the present invention uses a paste-like electrolytic solution as a surface treatment paste (hereinafter, referred to as a paste) as a treatment solution, and removes oxide scale, electrolytic polishing, passivation treatment, coloring treatment, and electroplating. And the like.

Here, the metal material to be treated in the present invention is a metal of various materials such as stainless steel, titanium, gold, silver, and copper such as a flat plate, a cup, a pot, a plate, a tube material, a block material, and a deformed material. It covers a wide range including not only products but also at least local products such as laminated products having at least a surface made of metal, welds, and steel pipes.

The paste used in the present invention is not particularly limited, and may be appropriately selected according to the surface treatment to be performed.

As the electrolytic pickling paste, acids such as sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid or sodium chloride, sodium sulfate,
Salts such as sodium nitrate and the like added alone and / or in combination can be pasted as they are or by adding water, as well as organic thickeners such as sodium polyacrylate, sodium alginate, xanthan gum and / or zeolites, Any material produced by any method can be used as long as it is made into a paste by adding an inorganic thickener such as water glass, colloidal silica, colloidal alumina, and sodium silicate fluoride.

As the plating paste, a normal plating solution, a solution containing a plating species such as a mixed solution of various metal salts and an acid or an alkali, for example, sodium polyacrylate, sodium alginate, organic thickeners such as xanthan gum and Any paste produced by adding an inorganic thickener such as zeolite, water glass, colloidal silica, colloidal alumina, sodium silicate fluoride or the like can be used.

Examples of the paste for coloring include alkalis such as caustic soda, caustic potash, and ammonia, or hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, hydrofluoric acid, chromic acid, dichromic acid, phosphoric acid, formic acid, acetic acid, malonic acid, Using an aqueous solution for color formation in which an acid such as maleic acid, malic acid or tartaric acid, or the above alkali or acid salt is used alone or in combination, for example, an organic thickener such as sodium polyacrylate, sodium alginate, xanthan gum and / or zeolite Any paste produced by adding an inorganic thickener such as water glass, colloidal silica, colloidal alumina, and sodium silicate fluoride can be used.

As a paste for etching and processing, alkali of caustic soda, or an acid such as hydrochloric acid, sulfuric acid, nitric acid, chromic acid, dichromic acid, hydrofluoric acid and / or a salt of the above alkali or acid alone or a mixture thereof Regarding any paste that can be pasted as it is or by adding water, of course, is a paste made by adding a pasting material such as sodium polyacrylate, or silicon dioxide, alumina, water glass, and sodium alginate. Those produced by the method can also be used.

Further, examples of the paste for electrolytic polishing include any paste material having excellent surface polishing properties among the above-mentioned paste for coloring and pickling for pickling.

FIG. 1 shows a preferred example of the electrolytic processing apparatus of the present invention.

The electrolytic processing apparatus 10 of the present invention shown in FIG. 1 performs a surface treatment of a metal plate 14 with a paste for electrolyte surface treatment (hereinafter referred to as a paste) 12 in the form of a paste. Cylindrical electrode roll 16, an electrode roll drive system 18 for driving the electrode roll 16, and a paste supply (for surface treatment) for supplying the paste 12 into the electrode roll 16 via the electrode roll drive system 18 System 20 and electrode roll 16
And a pad 22 that comes into contact with a metal material 14 that allows the pate 12 flowing out of the electrode roll 16 to leach onto the outer peripheral surface, and a pad 22
A pad drive system 24 for rotating the electrode roll 16 relative to the electrode roll 16 and a (power supply) means 26 for energizing the electrode roll 16 and the metal material 14 via the paste 12 leached from the pad 22.

In the present invention, since the electrode roll 16 and the pad 22 are relatively rotated, the surface of the electrode roll 16 can always be kept in a cleaned state, and always perform high-current efficiency and high-quality surface treatment. be able to.

In the present invention, the relative rotation is not limited to rotation speed in the same direction is different, as well as reverse rotation, when one is stopped, it is natural to include, for example, including positive and negative,
This includes all cases where the two rotational speeds are different.

Paste supply system 20 includes paste tank 28, pump 30, line
The paste 12 filled in the paste tank 28 has a flow rate adjusted by the valve 34 and is supplied into the electrode roll 16 via the line 32 and the electrode roll drive system 18 by the pump 30. .

Further, the paste supply system 20 has a bypass 36 and a bypass valve 38, and when the paste 12 is excessively supplied by the pump 30, the excess paste 12 is returned from the bypass 36 to the paste tank 28. You.

Each of the above members is coated with a material having excellent corrosion resistance such as stainless steel or a plastic having excellent chemical resistance so that the paste 12 is not corroded even when the paste 12 is acidic. It is preferred that

The paste 12 supplied from the paste supply system 20 is supplied and filled into the electrode roller 16 via a motor 40 and an electrode roll driving system 18 having a rotating shaft 42.

The motor 40 rotates the electrode roll 16 in the direction of arrow a in FIG.

The rotating shaft 42 is connected to the motor 40, and the electrode roll 16
Is fixed to the end face of the electrode roll 16 in a state of being inserted into the center line of the electrode roll 16. Here, the rotating shaft 42 is hollow, and the line 32 is connected to the rotating shaft 42. That is, paste 12
Is supplied to the electrode roll 16 through the rotating shaft 42.

The rotating shaft 42 will be described later in detail together with the electrode roll 16.

The electrode roll 16 has a hollow cylindrical shape,
The outer peripheral surface has a plurality of outlets 56 through which the filled paste 12 flows out. The paste 12 flows out from the outlet 56 and impregnates the pad 22.

A schematic diagram of such an electrode roll 16 and the aforementioned rotating shaft 42 is shown in FIG.

As described above, the rotating shaft 42 penetrates the end face 44 of the electrode roll 16 and is inserted into the center line in the electrode roll 16 and fixed to the end face 44, and transmits the driving force of the motor 40 described above, and
Rotate 16

On the outer peripheral surface of the rotating shaft 42 inside the electrode roll 16, a large number of openings 46 are formed for the paste 12 supplied from the paste supply system 20 to flow out.
Configured to supply 12. The shape, position, number, and the like of the openings 46 are not limited as long as the openings 46 can supply and fill the paste into the electrode roll 16 and can uniformly supply the paste 22 over the entire surface of the pads 22.

The electrode roll 16 has a hollow cylindrical shape,
It has a plurality of outlets 56 on its outer peripheral surface for flowing out the filled paste 12, and is rotated in a predetermined direction by the electrode roll drive system 18 described above.

The electrode roll 16 is not particularly limited as long as it has a hollow cylindrical shape, and the size, the rotation direction, and the like can be appropriately determined according to the situation at the site, the applied electrolytic processing apparatus, and the like. The shape, number, formation position, and the like of the outlets 56 are also not particularly limited, and are not particularly limited as long as the entire surface of the pad 22 is uniformly impregnated with the paste 12.

In the example shown in FIG. 1, the electrode roll 16 is rotated by a rotating shaft 42 inserted and fixed to its center line and a motor 40 directly connected thereto, but the present invention is not limited to this. Instead, for example, the driving force may be transmitted by various gears, transmission rollers, or the like to rotate. In this case, even if the position where the driving force is transmitted is the rotating shaft,
Further, the driving force may be transmitted to the outer peripheral surface of the electrode roll 16 by various gears, rollers, or the like, and the electrode roll 16 may be rotated.

Further, in the example shown in FIG. 1, the paste 12 is supplied into the electrode roll 16 from the rotating shaft 42. However, the present invention is not limited to this, and the paste 12 may be applied to various known means. Then, the line 32 may be connected to the end face 44 of the electrode roll 16 and the paste 12 may be supplied. However, in order to uniformly impregnate the entire surface of the pad 22 with the paste 12, it is preferable that the paste 12 is supplied from the inner center line of the electrode roll as in the illustrated example.

In the present invention, the electrode roll 16 only needs to rotate relative to the pad 22, so that the electrode roll 16 may be stopped and the pad 22 may be configured to rotate only. The electrode roll drive system 18 does not necessarily need to be provided.

The material of the rotating shaft 42, the electrode roll 16, and the like as described above is preferably a material that does not corrode even with an acidic paste such as stainless steel. In addition, it is preferable that an insulating member is provided on the rotating shaft 42 so as not to energize the motor 40 and the paste supply system 20.

The pad 22 is fitted with the electrode roll 16, impregnated with the paste 12 flowing out from the outlet 56, leached to the outer peripheral surface, and is in a cylindrical shape in contact with the metal material 14, and is relatively rotated with the electrode roll 16, In the example shown in FIG. 1, it rotates in a direction opposite to the electrode roll in the direction of arrow b.

That is, in the electrolytic processing apparatus 10 of the present invention, the electrode roll 16, the rotating shaft 42, the pad 22, and the metal material 14 are arranged as shown in the sectional view of FIG. 3, and the paste 12 (not shown)
Is supplied and filled into the electrode roll 16 through the opening 46 of the rotating shaft, flows out from the outlet 56 and is impregnated in the pad 22,
It is contained on the surface of 22 and comes into contact with the metal material 14. Here, the electrode roll and the metal material 14 are connected to the power source 26 via the paste 12.
The surface of the metal material 14 is subjected to electrolytic treatment by being energized in (FIG. 1).

The material of the pad 22 is not particularly limited, and is appropriately selected according to a target process.

For example, in the case of descaling by electrolytic pickling, it is preferable to use a hard pad material, and a material obtained by impregnating an insulator such as a woven fabric or a knitted fabric such as polyester fiber, glass fiber, or alumina fiber with various abrasives. Are preferably exemplified.

Also, in the case of plating, it is not necessary to polish the steel surface, so remove air bubbles due to gas generated from the steel surface and provide it so as not to impair conductivity, so use a soft pad material such as polyester or nylon. Is preferred.

The pad 22 rotates relative to the electrode roll 16.
Therefore, it is preferable that such a pad 22 has a core material such as various kinds of resin or metal in order to facilitate its rotation. Such a core material is not particularly limited as long as it does not hinder the impregnation of the paste 12, and examples thereof include a mesh-like material, a ladder step-like material, a spiral-like material, and the like.

The pad 22 rotates relative to the electrode roll 16 by the pad drive system 24, and in the illustrated example, rotates in the direction of arrow b in the direction opposite to the electrode roll 22.

The pad drive system 24 includes a motor 48 as a drive source and a pad rotating shaft for transmitting the driving force of the motor 48 to the pad 22.
50. In the present invention, since the pad 22 is rotated relative to the electrode roll 16 by the pad drive system 24, the surface of the electrode roll 16 is always kept clean, and high quality electrolytic surface treatment can be performed.

As the motor 48, various known motors can be applied as long as the motor can impart relative rotation to the electrode roll 16 to the pad 22 via the pad rotation shaft 50, and there is no particular limitation. The first
In the example shown in the figure, the motor 48 is directly connected to the pad rotation shaft 50, but in the present invention, various gears,
The rotation speed may be changed via a belt or the like, or may be changed via various deceleration means or the like in accordance with the type of surface treatment.

The pad rotating shaft 50 is not particularly limited as long as it can suitably transmit the driving force of the motor 48 to the pad 22. In the illustrated example, the pad rotating shaft 50 has a two-stage diameter corresponding to the motor 48 and the pad 22. . When the pad 22 has a core material as described above, it is preferable that the pad rotation shaft 50 be connected to the core material in order to more reliably transmit the rotational force.

In the illustrated example, the pad drive system 24 includes a pad rotation axis 50.
However, the present invention is not limited to this, and the pad 22 is rotated by a pad driving system that transmits driving force to the pad by various rollers, gears, and the like. You may.

In such an electrolytic treatment apparatus 10 of the present invention, the power supply
In the power supply means 26 having 52 and the wiring 54, the electrode roll 16 and the metal material 14 are energized through the paste 12 which leached from the pad 22 and contacted the metal material 14, and the metal material 14 is subjected to electrolytic surface treatment. You. As the power supply means 26, any of those normally applied to such an electrolytic processing apparatus can be applied, and there is no particular limitation.

When the metal material 14 is treated by such an electrolytic treatment apparatus 10, for example, in the case of plating, the paste tank 28 is filled with a predetermined paste 12. Next, the paste 12 is sent to the rotating shaft 42 of the electrode roll drive system 18 by the paste supply system 20, supplied into the electrode roll 16 from the opening 46 (FIG. 2), and the paste outlet 56 of the electrode roll 16. Then, the pad 22 is impregnated into the pad 22 and is leached out to the outer peripheral surface of the pad 22 to come into contact with the surface of the metal material 14. Here, the paste 12
Through the electrode roll 16 and the metal material 14 is energized to-,
The surface of the metal material 14 is subjected to electrolytic treatment.

Incidentally, the electrolytic processing apparatus of the present invention, the apparatus such as the electrode roll 16 does not move the metal material 14 moves, the metal plate 14 is fixed, the apparatus moves, the metal plate, the apparatus moves together, Any of them may be used.

As described above, the electrolytic treatment apparatus of the present invention has been described in detail. However, the present invention is not limited to this, and various improvements and changes may be made without departing from the spirit of the present invention. That is.

<Example> Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention.

Example 1 Electrolytic Nickel Plating Nickel plating was performed on an ordinary steel (SM50B) of 10 mm × 100 mm × 500 mm × using the electrolytic treatment apparatus 10 of the present invention shown in FIG.

The paste 12 used was prepared by adding 10 wt% of xanthan gum as a paste agent to a Watt bath (330 g / l of nickel sulfate, 45 g / l of nickel chloride, 38 g / l of boric acid, the remaining water).

The electrode roll 16 has a diameter of 60 mm, a length of 100 mm, and
The pad 22 was made of nylon having a thickness of 5 mm.

The number of rotations of the electrode roll 16 during plating is 30 in the direction of arrow a.
rpm, and the speed of the pad 22 is 2 rpm in the direction of the arrow b, so that the plating speed is about 450 mm / min. Also, Table 1 shows the current value applied between the two electrodes during plating and the approximate current density (current value divided by the area of the pad 22 in contact with the metal surface).

The nickel plating state of the surface nickel-plated steel sheet obtained as described above was confirmed. Table 1 shows the evaluation criteria and the results.

From the results shown in Table 1, according to the apparatus of the present invention, there is no burn or unevenness on the nickel plating surface, and particularly, the current density is 50 to 20.
Good plating can be obtained in the range of 0 mA / cm ² .

[Example 2] Electrolytic pickling A 12 mm x 100 mm x 500 mm x stainless steel clad steel (one side) scale material was electrolytically pickled using the electrolytic treatment apparatus 10 of the present invention shown in Fig. 1.

Paste 12 is composed of sulfuric acid 10wt%, sodium polyacrylate 5w
The one having the composition of t% and the balance of water was used.

The electrode roll 16 has a diameter of 60 mm, a length of 100 mm, and
The pad 22 was made of 8 mm thick polyester (impregnated with abrasive).

The number of rotations of the electrode roll 16 during plating is 30 in the direction of arrow a.
The rpm and the pad 22 were set to 60 rpm in the direction of the arrow b. In this case, the metal material 14 was moved at 300 mm / min, and the pickling was performed at a processing speed to perform electrolytic pickling. Table 2 shows the current value applied between the two electrodes during plating and the approximate current density (the current value was divided by the area of the pad 22 in contact with the metal surface).

The surface unevenness and the degree of descaling of the electrolytic pickling detergent stainless clad steel obtained as described above were visually observed. Table 2 shows the evaluation criteria and the results.

As a comparative example, the same observation was performed on the same stainless-clad steel that had been grinder-finished and the one that was immersed in a 10% sulfuric acid solution for 90 minutes. The results are also shown in Table 2.

From the results shown in Table 2, it can be seen that the apparatus of the present invention can perform descaling better than the conventional method. In particular, at a current density of 200 mA / cm ² or more, very good descaling can be performed.

 From the above results, the effect of the present invention is clear.

<Effects of the Invention> As described above in detail, the electrolytic treatment apparatus of the present invention provides a surface treatment paste while supplying a paste for surface treatment to a pad and a surface of a metal to be treated from a cylindrical electrode roll having an outlet thereof. Since one or both sides of the treated metal are subjected to electrolytic treatment, the descaling, electrolytic pickling, passivation, electrolytic polishing, and coloring treatment of the metal material surface can be performed by suitably selecting the surface treatment paste and pad. In addition, various electrolytic treatments such as plating and the like can be efficiently performed on site at low cost.

In addition, the electrolytic treatment apparatus of the present invention performs the electrolytic treatment while the electrode roll and the pad rotate relative to each other, so that the surface of the electrode roll can always be kept clean by the pad, and a stable current and a high quality surface can be obtained at all times. Processing can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of the electrolytic processing apparatus of the present invention. FIG. 2 is a partially cutaway schematic view of an electrode roll and a rotating shaft applied to the electrolytic processing apparatus of FIG. FIG. 3 is a schematic cross-sectional view of an electrode roll, a rotating shaft, a pad, and a metal material applied to the electrolytic processing apparatus of FIG. Explanation of reference numerals 10: electrolytic treatment device, 12: paste (for surface treatment), 14: metal material, 16: electrode roll, 18: electrode roll drive system, 20: supply of paste (for surface treatment) System, 22 pad, 24 pad driving system, 26 power supply device, paste tank (for surface treatment), 30 pump, 32 line, 34, 38 valve, 36 ... Bypass, 40,48 ... Motor, 42 ... Rotating axis, 44 ... End face, 46 ... Opening, 50 ... Pad rotating axis, 52 ... Power supply, 54 ... Wiring, 56 ... Outlet

Claims (1)

(57) [Claims] 1. An electrolytic treatment apparatus for electrolytically treating a surface of a metal material with a paste for surface treatment, comprising: a hollow cylindrical electrode roll having a plurality of outlets for the paste for surface treatment on an outer peripheral surface; An electrode roll drive system for driving a roll; a surface treatment paste supply system for supplying the surface treatment paste into the electrode roll; and the surface treatment that fits the electrode roll and flows out of the entrance / exit. A cylindrical pad that is in contact with the metal material, impregnated with a paste for use, and leached to the outer peripheral surface; a pad drive system that rotates the pad relative to the electrode roll; and the surface of the electrode roll and the metal material. Means for conducting electricity through the processing paste.