JPH0635680B2 - Local electrolytic treatment device for metal surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a device for simply performing partial descaling, partial plating, etc. on a metal material surface or a welded portion of a structure.

<Prior Art> Conventionally, as a method for descaling a surface of a metal material or a structure, a method in which a container filled with an electrolytic solution is attached to a processing portion to energize, a method such as shot blasting, pickling with an aqueous solution, or the like is used. .

<Problems to be Solved by the Invention> However, in the case of the method using the above-described electrolytic solution, if the metal surface is not smooth or has a corner or an edge, the electrolytic solution may be spilled or washed away. Was difficult. Moreover, it was even more difficult for the vertical plane and the ground.

Also, shot blasting has problems of dust and noise, and pickling has environmental problems such as sewage contamination. There were problems such as deterioration of properties and long processing time.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a partial surface treatment technology for metal materials, particularly an electrolytic treatment apparatus capable of performing various local treatments of high efficiency and high quality in the field. It is in.

<Means for Solving the Problems> That is, the inventors of the present invention have conducted repeated researches to achieve the above-mentioned object, and for the parts such as a welded portion, a vertical surface, and a ground surface, which cannot be conventionally treated by the partial surface treatment technique, We have succeeded in developing a device that ensures stable electrolytic current and enables high-quality partial surface treatment in the field by making various efforts such as electrode shape and appropriate amount of paste supply.

That is, the present invention is a hollow electrode having a plurality of paste-like electrolyte solution ejection ports and a paste-like electrolyte solution supply port, and a paste-like electrolyte solution that covers the hollow electrodes and is ejected from the paste-like electrolyte solution ejection port. A pad to be leached, a paste-like electrolytic solution adjusting means for adjusting the opening amount of the ejection hole of the hollow electrode, and an arbitrary amount of the paste-like electrolytic solution is sent to the hollow portion of the hollow electrode via the paste-like electrolytic solution supply port. There is provided a local electrolytic treatment device for the surface of a metal material, comprising: a paste-type electrolytic solution feeding / supplying device for supplying the electrolytic solution; and a power supply device for supplying electricity between the hollow electrode and the metal material to be surface-treated.

The hollow electrode is preferably L-shaped or spherical.

Further, the present invention provides a hollow electrode having a plurality of paste-like electrolytic solution ejection ports and a paste-like electrolytic solution supply port, the shape of which is L-shaped or spherical, and the hollow electrode which covers this hollow electrode and A pad for leaching out the paste-like electrolytic solution ejected from the liquid ejection port, and a paste-like electrolytic solution feeding / supplying device for feeding an arbitrary amount of the paste-like electrolytic solution through the paste-like electrolytic solution supply port to the hollow portion of the hollow electrode. And a local electrolytic treatment device for the surface of a metal material, which comprises a power supply device for supplying electricity between the hollow electrode and the metal material to be surface-treated.

Then, it is preferable to connect the hollow electrode and the paste electrolyte feeding device via an insulator.

Further, the present invention, a hollow electrode having a plurality of paste-like electrolyte solution outlet and paste-like electrolyte solution supply port, and a paste-like electrolyte solution which covers the hollow electrode and is jetted from the paste-like electrolyte solution outlet. The pad to be leached and the hollow electrode are connected via an insulator, and the paste-like electrolyte solution is supplied to the hollow portion of the hollow electrode through the paste-like electrolyte solution supply port to supply an arbitrary amount of the paste-like electrolyte solution. It is intended to provide a local electrolytic treatment apparatus for the surface of a metal material, which has an apparatus and a power supply device for supplying electricity between the hollow electrode and the metal material to be surface-treated.

Further, it is preferable to add a paste electrolyte flow rate adjusting means to the paste electrolyte feeder.

Further, the pad preferably has a curved surface in contact with the metal material.

Further, it is preferable that a rigid pipe is connected to the supply port of the hollow electrode.

First, the partial electrolytic treatment apparatus of the present invention will be described based on a preferred embodiment of the present invention.

FIG. 1 shows an example of local electrolytic treatment of a welded portion, and FIGS. 3 and 5 show examples of local electrolytic treatment at different portions of a material to be treated, that is, vertical, ground welded portion and circular welded portion. Show.

Further, as shown in FIGS. 1, 3, and 5, the cross sections of the hollow electrode and the pad used for the local electrolytic treatment are shown in FIGS. 2, 4, and 6, respectively, and will be described in order. To do.

First, the configuration of the local electrolytic treatment apparatus will be described with reference to FIG.

The pasty electrolytic solution used in the present invention (hereinafter simply referred to as a paste) varies depending on the intended treatment, but electrolytic pickling pastes include sulfuric acid type and neutral salt type.

As the plating paste, an ordinary 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,
Any method can be used as long as it is made into a paste by adding an organic thickener such as sodium alginate and xanthan gum and / or an inorganic thickener such as zeolite, water glass, colloidal silica, colloidal alumina and sodium silicofluoride. A manufactured product can also be used.

Examples of the coloring paste include caustic soda, caustic potash, alkali such as ammonia, or hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, hydrofluoric acid, chromic acid, dichromic acid, phosphoric acid, formic acid,
Acids such as acetic acid, malonic acid, maleic acid, malic acid, tartaric acid, etc., or an aqueous solution for coloring which is used alone or as a mixture of the above-mentioned alkali or acid salts, for example, organic thickening agents such as sodium polyacrylate, sodium alginate, xanthan gum, etc. Any one produced by any method can be used as long as it is made into a paste by adding an agent and / or an inorganic thickening agent such as zeolite, water glass, colloidal silica, colloidal alumina, and sodium silicofluoride. .

As the etching and processing paste, alkali of caustic soda, or acid such as hydrochloric acid, sulfuric acid, nitric acid, chromic acid, dichromic acid, hydrofluoric acid and / or the above alkali or acid salt is used alone or as a mixture. As for the paste, as it is or as a paste prepared by adding water, any method can be used as long as it is a paste formed by adding a paste forming material such as sodium polyacrylate, silicon dioxide, alumina, water glass, or sodium alginate. It is also possible to use those manufactured in.

Further, it has tackiness and viscosity such that even if it is partially supplied onto the metal material, it does not diffuse beyond the supplied width. Therefore, even in the case of locally processing a welded portion, a steel pipe or the like, the electrolytic treatment can be performed particularly reliably and easily.

Further, the metal material to which the present invention can be applied includes flat plates, cups, vases, stainless steel such as plates, titanium, gold,
A wide range is possible, including metallic products such as silver and copper, laminated products having at least a metal surface, and localized parts such as welds and steel pipes.

The paste used for the local electrolysis is supplied from the paste tank 2 of the pasty electrolytic solution feeder 1 through the pipe 4 by the paste supply pump 3.

The flow rate of the paste is a paste flow rate adjusting valve 5 which is a pasty electrolytic solution flow rate adjusting means installed in the middle of the pipe 4.
And the paste which is adjusted by the paste supply pump 3 and flows out excessively returns to the paste tank 2 via the bypass pipe 18.

A necessary amount of paste flowing in using the pipe 4 is fed into the hollow electrode described later via the connecting pipe 6, and is leached from the pad 8 on the surface of the hollow electrode.

At this time, the surface of the pad 8 and the metal material 9 as the material to be treated are brought into contact with each other, and the pipe 4 interlocked with the hollow electrode while flowing an electric current.
Can be electrolyzed by moving.
That is, a vertical welded portion 1 of two metal materials as shown in the figure.
It is possible to perform electrolytic treatment even in a local portion such as 0 where electrolytic treatment is difficult.

Further, the electrolytic treatment may be performed while rotating between the pipe 4 and the electrode. That is, if the pipe and the electrode are connected by using a rotary joint or the like as the connecting pipe 6 and the paste is soaked in the entire pad 8, the pad surface can be effectively used and the treatment operation can be performed. It's easy.

The material of the pad 8 depends on the type of electrolytic treatment, but if it is electrolytic pickling, for example, woven cloth such as polyester fiber, glass fiber, nylon fiber, alumina fiber, or insulator such as knitted cloth.

In the case of electrolytic plating, a relatively hard pad like electropolishing is not required, so a sponge-like material that can withstand the acid of the plating paste may be used. Specifically, nylon fiber, polyester fiber, etc. may be mentioned.

Further, in the case of the color development treatment, it is preferable to use cellulose or the like, but the preferable one may be selected and used without being limited to the above-mentioned ones according to the purpose.

Further, the power source for the electrolytic treatment may be that the wiring 12 is extended from the power supply device 11, one is attached to the metal material 9 and the other is attached to the hollow electrode, and a desired amount of electric current is passed to perform the desired electrolytic treatment. be able to.

At this time, the processing such as pickling, plating, and color development can be freely performed by changing the wiring polarity or selecting an appropriate paste.

Next, in FIG. 2a, an example of the constitution of the paste supply means in the hollow electrode 7 is shown.

As described above, the paste is the pasty electrolytic solution feeder 1
Through the pipe 4, through the connecting pipe 6 connecting the pipe 4 and the hollow electrode 7 into the hollow electrode 7 through the paste supply port 14, and is leached from the ejection pad 8 through the electrode hole 15a of the hollow electrode 7. It

Further, in FIG. 2a, in order to adjust the leaching amount of the paste, inside the hollow electrode 7, a straight tube-shaped paste leaching adjusting means 13 is inscribed, which is operatively connected to the paste leaching adjusting handle 16. It is connected. Then, the paste leaching control handle 16 and the paste leaching control means 13
Is configured to adjust the leaching amount of the paste by shifting the positions of the electrode hole 15a and the hole 15b of the paste leaching adjustment means by relative rotation or relative movement and adjusting the opening between them.

FIG. 2b shows a concrete example of adjusting the paste leaching amount.
Shown in Figures 2c and 2d.

That is, FIG. 2b is an example in which the hollow electrode 7 and the jet outlet 15 of the paste leaching control means 13 are maximized. The hollow electrode 7 and the jetting port 15 of the paste leaching adjusting means 13 may be provided in a single number or in plural numbers depending on the shape and area of the material to be treated.

2c and 2d show an example in which the leaching amount of paste is reduced as compared with FIG. 2b. These are those in which the paste leaching outlets are reduced, but it is also possible to adjust the leaching amount by shifting the electrode hole 15a of the hollow electrode and the hole 15b of the paste leaching adjusting means and adjusting the openings by both.
Further, in FIG. 2a, it may be moved in the left-right direction as indicated by an arrow a, and the device of the present invention is not particularly limited to these adjusting methods.

Further, it is preferable to provide an insulator 17 in the connecting pipe 6 that connects the hollow electrode 7 and the pipe 4 so that the current of the hollow electrode 7 does not flow to the pipe or the like. Teflon as an insulator,
It is preferable to use vinyl chloride, silicone rubber or the like.
The reason for this is that by installing the insulator 17, stable current efficiency can be obtained in the electrolytic treatment.

By forming the assembly of the hollow electrode and the pad as described above, it is possible to carry out the partial electrolytic treatment not only on the deformed portion such as the welded portion and the details but also on the other steel plate, for example, the flat portion.

Further, when the welded portion between the metal materials is L-shaped or spherical, it is advisable to use a modified pad shape as shown in FIGS. 3 and 5, respectively.

Cross-sectional views of the L-shaped and spherical electrode-pad assemblies are shown in FIGS. 4 and 6, respectively.

In the L-shaped pad example 8 as shown in FIG. 4a, the cylindrical hollow electrode 7 described above can be bent at a desired angle and position. In the case of the L-shape, as shown in FIG. 4b which is a sectional view taken along the line IV-IV of FIG. 4a, it is sufficient in most cases to provide the paste ejection port 15 only on the outer side of the hollow electrode. As for the structure, as shown in FIGS. 2b to 2d, it is preferable to change the size and position of the ejection port according to the purpose and application.

Further, FIG. 5 shows the case where a steel pipe is welded to a steel plate,
It is an example when the welded portion is spherical. By making the hollow electrode 7 and the pad 8 spherical, the paste can be leached from the entire surface of the spherical pad 8 as shown in FIG. 6, and the spherical local electrolytic treatment can be easily performed.

Next, the operation of the local electrolytic treatment apparatus of the present invention will be described based on the partial electrolytic treatment apparatus of FIG.

The partial electrolytic treatment apparatus of the present invention can be used for electrolytic treatment such as electrolytic pickling, plating, color development, and etching treatment.

As shown in FIG. 1, a predetermined paste is sent from the paste tank 2 of the pasty electrolytic solution feeder 1 to the hollow electrode 7 from the paste supply port 14 through the pipe 4 by the paste supply pump 3.

The flow rate of the paste varies depending on the area and shape of the metal material as the material to be treated and the size and shape of the pad for leaching the paste, but the paste supply is a paste-like electrolytic solution flow rate adjusting means installed in the middle of the pipe 4. Pump 3 and /
Alternatively, it is adjusted by the paste flow rate adjusting valve 5.

If excess paste is spilled, bypass pipe 1
By returning to the paste tank 2 via 8 it is possible to effectively use the paste.

Further, the pipe 4 is preferably made of a material having rigidity, that is, stainless steel or high alloy steel so that the hollow electrode-pad assembly can be pressed and moved to a welded portion or the like.

It is preferable that the pipe 4 and the hollow electrode 7 are connected by a connecting pipe 6 and an insulator 17 is inserted between them, as shown in FIG. 2a. This has the effect that when a current is applied to the electrodes, it will prevent the current from flowing through the pipe 4 and further into the paste to be supplied, and the electrolytic treatment can be carried out with good current efficiency.

The paste supplied from the paste supply port 14 is jetted from the electrode hole 15 a of the hollow electrode and is leached from the pad 8.

Further, in FIG. 2, paste leaching adjusting means 13 inscribed in the hollow electrode 7 is provided as a paste-like electrolysis amount adjusting means.

This paste leaching control means 13 has the electrode hole 15a.
Similarly to the above, the hole 15b of the paste leaching amount adjusting means is provided.

The paste leaching adjustment means 13 is integrated with a paste leaching adjustment handle 16, and the handle 16 is rotated or moved in the left-right direction to shift the opening positions of the electrode hole 15a and the paste leaching amount adjusting means hole 15b. Thus, the amount of paste discharged from the paste discharge port 15 can be adjusted freely. One example is the second b-d
Shown in the figure.

Here, the paste leaching control means 13 is preferably made of the same stainless steel as the electrode.

The paste discharged from the paste discharge port 15 is the pad 8
A desired electrolytic treatment can be carried out by leaching by impregnation with the above, and applying a current between the hollow electrode and the metal material.

Further, the surface of the pad 8 that is in contact with the metal material 9 is preferably curved. The curved surface is preferable because the area in contact with the metal material is wide and the treatment efficiency is good.

Further, when the local portion such as the welded portion to be subjected to the electrolytic treatment is L-shaped or spherical, the hollow electrode 7 and the pad 8 described above are also processed into an L-shaped or spherical surface, It is preferable to perform electrolytic treatment.

That is, if it is L-shaped, not only on a surface perpendicular to the ground, but also on places where it is difficult to perform electrolytic treatment conventionally, such as on the ground and corners, and on local parts such as welds,
It can be easily processed.

<Examples> The present invention will be specifically described below based on Examples.

(Example 1): Electrolytic pickling of stainless steel welded portion (descaling) SUS304 stainless steel plate (12 mm thick x 300 mm x
Two pieces (1,000 mm) were fillet-welded to a T shape, and electrolytic pickling was performed on the welded portion using the partial electrolytic treatment apparatus of the present invention. The composition of the paste used is 10 wt% sulfuric acid, 5 wt% sodium polyacrylate, and 85 wt% water.

The electrolytic pickling conditions are shown in Table 1 below.

The shape of the electrodes and pads was cylindrical, L-shaped, or spherical, respectively.

After electrolytic pickling, each T-shaped test piece was cut into a shape of 100 × 100 × 100 mm, and the corrosion resistance was examined by a salt spray test.

The results are shown in Table 1.

The current density is calculated from the approximate area of the electrode facing the flowing current, and the treatment time is the welded portion 30.
The time required per cm.

(Comparative Example 1) As comparative examples, a grinder finish, pickling with 10% sulfuric acid, and a as-welded product were given.

As the evaluation, the surface finish and the salt spray test 150
The results are shown in Table 1 with the corrosion resistance as a function of time.

As can be seen from the results shown in Table 1, in the example of the present invention, although there is a difference in processing time depending on the shapes of the electrode and the pad,
The surface finish unevenness and the degree of descaling were good, and at the same time as descaling, a strong passivation film was formed on the surface of the SUS304 stainless steel and the welded portion, showing excellent corrosion resistance.

There is some surface unevenness in the grinder finish of the comparative example,
In pickling with a 10% sulfuric acid solution, the scale could not be removed without brushing, the scale could not be completely removed even after 1 hour, and the efficiency was poor.

(Embodiment 2): Partial electrolytic Ni plating of ordinary steel welded portion 12 mm thick ordinary steel is rust removed by shot blasting, Ni is plated with various electrodes and pads, gas cutting is performed, and then fillet welding is performed into a T shape. Partial electrolytic plating was performed on the Ni-plated damaged portion in the vicinity of the deposited metal portion and the welded portion.

The composition of the Ni plating solution is as follows.

Nickel sulfate 330g /, nickel chloride 45g /,
This is a Ni-plating paste in which 38 g of boric acid / and the balance of water are added 5 wt% of sodium polyacrylate.

Table 2 also shows the Ni plating treatment conditions and the results.

To confirm the Ni plating in the vicinity of the welded portion, the cross section of the welded portion was cut and observed with a microscope.

As a pretreatment for Ni plating, electrolytic pickling was performed using the same paste as in Example 1. The current densities of the pretreatment and electrolytic Ni plating are similar to those in Example 1, and are based on the approximate area facing the surface to be treated.

The treatment time is also the time per 30 cm of welding bead as in Example 1.

As the electrodes and pads, the same three types as in Example 1 were used.

It can be seen that the Ni plating can be applied to the vicinity of the deposited metal portion and the welded portion with any of the electrodes and pads.

<Effects of the Invention> As described in detail above, by using the partial electrolytic treatment apparatus for the surface of a metal material of the present invention, the surface treatment of any metal material can be performed on site, at low cost, and with a small apparatus.

Therefore, especially for stainless clad steel, etc., the welded part on one side is processed, part of the structure is rusted,
The characteristics of the present invention are exhibited when the plating treatment is performed.

Further, the present invention does not require fixing of electrolytic equipment, and by selecting an appropriate electrode shape and paste, surface treatment of all metal structures and metal products (electrolytic pickling, passivation treatment, electrolytic polishing) , Electrolytic plating, electrolytic coloring, etc.) can be performed easily and quickly.

[Brief description of drawings]

FIG. 1, FIG. 3 and FIG. 5 are schematic views of the partial electrolytic treatment apparatus of the present invention when using a tubular, L-shaped or spherical electrode, respectively. FIG. 2a is a partial longitudinal sectional view of a partial electrolytic treatment apparatus having a straight tubular electrode-pad assembly of the present invention. 2b, 2c, and 2d are cross-sectional views showing various examples in which the opening degree of the paste ejection opening is adjusted. FIG. 4a is a partial vertical cross-sectional view of an electrolytic treatment apparatus having an L-shaped electrode-pad assembly of the present invention. FIG. 4b is a cross-sectional view taken along the line IV-IV of FIG. 4a. FIG. 6 is a partial vertical sectional view of an electrolytic treatment apparatus having a spherical electrode-pad assembly of the present invention. DESCRIPTION OF SYMBOLS 1 ... Paste electrolyte supply device, 2 ... Paste tank, 3 ... Paste supply pump, 4 ... Pipe, 5 ... Paste flow rate adjusting valve, 6 ... Connection pipe, 7 ... Hollow Electrode, 8 ... Pad, 9 ... Metal material, 10 ... Welded portion, 11 ... Power supply device, 12 ... Wiring, 13 ... Paste leaching amount adjusting means, 14 ... Paste supply port, 15 ... Paste Jet port, 15a ... Hollow electrode Electrode hole, 15b ... Hole for paste leaching amount adjusting means, 16 ... Paste leaching amount adjusting handle, 17 ... Insulator, 18 ... Bypass piping

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location C25F 7/00 K 8414-4K (72) Inventor Nobuyoshi Ishiwata 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki (72) Inventor Mitsuo Kimura, 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division (56) Reference JP-A-57-171689 (JP, A) JP 1 -294899 (JP, A)

Claims (8)

[Claims] 1. A hollow electrode having a plurality of paste-like electrolytic solution jetting ports and a paste-like electrolytic solution supply port, and a paste-like electrolytic solution which covers the hollow electrode and jets out from the paste-like electrolytic solution jetting port. A pad, a paste-like electrolytic solution adjusting means for adjusting the opening amount of the ejection hole of the hollow electrode, and an arbitrary amount of the paste-like electrolytic solution is fed to the hollow portion of the hollow electrode via the paste-like electrolytic solution supply port. A local electrolytic treatment apparatus for a surface of a metal material, comprising: a paste-like electrolytic solution feeding / supplying device; and a power supply device that energizes between the hollow electrode and the metal material to be surface-treated. 2. The local electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein the hollow electrode is L-shaped or spherical. 3. A hollow electrode having a plurality of paste electrolyte outlets and a paste electrolyte supply port, the shape of which is L-shaped or spherical, and the paste electrolyte which covers the hollow electrode. A pad for leaching the paste-like electrolytic solution ejected from the ejection port, and a paste-like electrolytic solution feeding / supplying device for feeding an arbitrary amount of the paste-like electrolytic solution through the paste-like electrolytic solution supply port to the hollow portion of the hollow electrode. A local electrolytic treatment apparatus for the surface of a metal material, comprising: a power supply device for supplying electricity between the hollow electrode and a metal material to be surface-treated. 4. The local electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein the hollow electrode and the paste electrolyte feeding device are connected via an insulator. 5. A hollow electrode having a plurality of paste-like electrolyte solution outlets and a paste-like electrolyte solution supply port, and a paste-like electrolyte solution which covers the hollow electrodes and is jetted from the paste-like electrolyte solution outlet And a pad-like electrolytic solution feeding / supplying device that is connected to the hollow electrode via an insulator, and feeds an arbitrary amount of the pasty electrolytic solution to the hollow portion of the hollow electrode via the paste-like electrolytic solution supply port. A local electrolytic treatment apparatus for the surface of a metal material, comprising: a power supply device for supplying electricity between the hollow electrode and the metal material to be surface-treated. 6. The local electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein a paste electrolyte flow rate adjusting means is added to the paste electrolyte feeder. 7. The local electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein the pad has a curved surface in contact with the metal material. 8. The local electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein a rigid pipe is connected to the supply port of the hollow electrode.