JPH0633519B2 - Electrolytic treatment device for metal surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention efficiently removes oxide scale adhering to the surface of a metal material, particularly the surface of a steel material such as stainless steel,
The present invention relates to a device for easily performing electrolytic treatment such as electrolytic polishing, passivation treatment, coloring treatment, and electroplating.

<Prior art> Conventionally, the descaling is a treatment applied to the surface of a metal material,
Examples thereof include surface polishing, passivation treatment, coloring treatment and plating, and there are methods such as mechanical treatment, chemical treatment and electrochemical treatment. However, these conventional processing methods have the following drawbacks.

That is, for example, for descaling treatment, shot blasting is a typical mechanical treatment, but there are environmental problems such as dust and noise generation, and it is difficult to perform direct treatment at the treatment site. Then, there is a defect that the work hardened layer remains on the surface, which adversely affects the corrosion resistance or the mechanical properties.

Although there is a so-called descaling treatment by so-called pickling in the chemical treatment, the treatment takes a long time, and there is a problem that the on-site treatment is difficult due to environmental problems caused by using the acid solution. In recent years, an in-situ pickling method using a pickling paste has been performed, but it has a drawback that it requires a long time and uneven pickling tends to occur.

In electrochemical treatment, there is a so-called descaling treatment by electrolytic pickling, and treatment in a short time is possible, but there is a drawback that on-site treatment is difficult due to the limitation of solution and equipment.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a surface treatment technique for metal materials, in particular, various electrochemical treatments with high efficiency and high quality. An object of the present invention is to provide an apparatus that enables on-site processing, which is a decisive drawback of the processing method. That is, to provide a device capable of high-quality treatment by ensuring a stable current and extending the life of the pad by repeatedly devising a device for supplying an appropriate amount of paste and the shape of electrodes and pads on the electrolytic surface. It is in.

<Means for Solving the Problems> The present invention relates to a plurality of grooves arranged in parallel on a surface facing a metal material to be surface-treated at a predetermined interval, and an electrode provided with holes at the bottom of each groove. , The electrode is attached to the bottom surface, and the paste-like electrolyte solution trap having a paste-like electrolyte solution supply hole communicating with the hole on the bottom surface, and the upper end portion is closely adhered to each groove and the lower end portion is the metal. A plurality of pads that are brought into contact with the material and hold and leaching the paste electrolyte supplied from the plurality of holes; and a paste that pressure-feeds the paste electrolyte to the pads through the paste electrolyte trap. Electrolyte solution pressure-feeding device, a paste-like electrolyte solution flow rate adjusting device that adjusts the supply amount of the paste-like electrolyte solution pressure-feeding device, and the plurality of pads are held between the metal material and the electrode,
Further, the present invention provides an electrolytic treatment apparatus for the surface of a metal material, which has a power supply means for supplying electricity via a paste-like electrolytic solution leaching from the power supply means.

Here, it is preferable that the plurality of pads are arranged in parallel or bent.

The present invention will be described in more detail below.

The present inventors have accomplished the present invention as a result of conducting research to enable these conventional electrochemical field treatments.
In order to carry out the electrochemical treatment on site, it is necessary to prepare a paste electrolyte (hereinafter referred to as paste) supply device and an electrolysis device for ensuring a stable electric current required for electrolysis. Since the paste has a high viscosity, it is necessary to have a device that controls an appropriate amount due to the difference in the supply method and the treatment surface.For securing a stable current required for electrolysis, the shape of the electrode, the shape of the pad, the treatment It is essential to devise the distance between the surface and the electrode, the distance between the pads, and so on.

That is, the apparatus for electrolytically treating a surface of a metal material according to the present invention includes a paste supply device 1 and a disassembling device 2.

First, the paste supply device 1 will be described. The pastes have different viscosities for the purpose to be treated and must be controlled to obtain the optimum amount. As the paste, for example, a mixed solution of sodium polyacrylate, sulfuric acid, and water can be used.

1 and 2 show a configuration example of the paste supply device 1. The apparatus shown in FIG. 1 is an apparatus used when the paste viscosity is relatively low, and the apparatus shown in FIG. 2 is an apparatus used when the paste viscosity is relatively high.

As can be seen from FIG. 1, the paste supply device 1 includes a lower cylinder 1
1 and an upper cylinder 12 fitted therein. Upper cylinder 12
A shaft 14 is fixed to the shaft 14 by a screw 15 via a brim 13 fixed to the shaft 14. A piston 16 is fixed in the middle of the shaft 14 by a nut 17, and a paste chamber 18 is defined between the piston 16 and the lower cylinder 11.

A weight 19 necessary for supplying an appropriate amount of paste is provided on the upper cylinder 12.
Is configured to be placed.

A paste discharge port 20 communicating with the paste chamber 18 is formed at the lower end of the lower cylinder 11, and a cock 21 is provided here. The paste discharge port 20 is connected to the paste supply port of the electrolytic device described later.

The supply amount of the paste is controlled by the weight 19 placed on the upper cylinder 12 and the cock 21 provided at the discharge port 20. Since the device shown in FIG. 1 is used for a paste having a relatively low viscosity, the shaft 14 is used for the piston 1.
It is preferable to extend from 6 to a considerable length downward and reach the inside of the paste discharge port 20, whereby the discharge amount of the paste can be appropriately controlled.

Since the apparatus shown in FIG. 2 is used for a paste having a relatively large viscosity, it is not necessary to have such a constitution, and it is sufficient if the piston 16 can be attached to a length. The apparatus shown in FIG. 2 has the same configuration as the apparatus shown in FIG. 1 except for this point, and therefore the description thereof will be omitted.

In the paste supply device 1, each component is preferably made of an acid-resistant and heat-resistant material that can withstand the paste. In addition, in order to prevent the leakage of the paste, it is preferable to insert an O-ring 22 between the lower cylinder 11 and the piston 16.

Next, regarding the electrolysis apparatus 2 for ensuring a stable current on the electrolysis surface and obtaining a long-term life, FIGS.
It will be described with reference to the drawings. To achieve these goals,
In the electrolysis device 2, it is necessary to devise the configuration of the electrode and the pad.

As is clear from FIGS. 3a and 3b, the electrolysis device 2 comprises a housing 31, on top of which a paste supply port 32 and a wiring port 33 are provided.
2 is the paste discharge port 20 of the paste supply device 1 described above.
Connected to.

The housing 31 defines a paste trap chamber 34 inside, and a bottom plate 35 of the housing 31 has a paste discharge port 36.
Are formed. The paste trap chamber 34 has a function of causing the paste to be evenly distributed in a pad to be described later by being filled with the electrolytic solution (paste).

An electrode 37 is arranged below the bottom plate 35 of the housing 31, and a large number of grooves 37 a for supporting the paste 38 and supporting the pad 38 are formed in the electrode 37. Pad 3
8 is fixed in a strip shape by the step portion 37b of the groove 37a of the electrode 37, and as shown in FIG. 3b, the pad 38 is obliquely arranged. In this device, the paste supplied from the paste supply device 1 enters the trap chamber 34, and the holes 36 formed in the bottom plate 35 of the housing 31
The pad 38 is reached through a hole 39 formed in the electrode 37.

Here, the gap between the pads is very important. If this gap is small, scale etc. from the material to be treated will accumulate in the gap,
It becomes difficult for current to flow. If this gap is too large, a space is likely to be formed between the pads, making it difficult to retain the paste, so that a stable current cannot be secured.

Therefore, the distance between the pads should be such that such a situation does not occur, but it is most preferable to make the thickness of the pads approximately equal to the thickness of the pads and be about 5 mm. Further, in order to prolong the life of the electrode 37, it is preferable to use stainless steel, a copper plate or the like.

To secure a stable current, it is necessary to properly select the distance between the processing surface and the electrode. The current can be secured even if this distance is several mm or less, but it is preferably 10 mm or less. This distance becomes smaller as the pad wears by a very small amount, but it is preferable to replace the pad when it becomes 2-3 mm. This is because if the electrode and the material to be treated are short-circuited, the treatment cannot be performed.

Although the material of the pad has the greatest effect on the longevity, the material of the pad requires woven fabric such as polyester fiber, glass fiber and alumina fiber, and insulator such as knitted fabric.
In order to extend the life, it is suitable to impregnate these fibers with an abrasive.

The pad can be easily changed in processing conditions, paste type, etc., and can be washed, and it is good to consider measures to improve workability.

Another configuration example of the electrolysis apparatus used in the present invention will be described with reference to FIGS. Regarding these, only the points different from the above-described apparatus of FIG. 3 will be described.

In the example shown in FIGS. 4a and 4b, the electrodes 37 and the pads 38 are arranged in the same manner as the examples shown in FIGS. 3a and 3b, but the strip-shaped pads 38 are vertically aligned without tilting. It was done.

The example shown in FIGS. 5a and 5b is a modification of the example shown in FIGS. 4a and 4b, and the pads 38 are arranged in a zigzag shape so that the scale can be easily discharged as shown in FIG. 5b. It was done.

The electrolytic treatment apparatus for the surface of a metal material of the present invention is used as shown diagrammatically in FIG. The paste supply device 1 and the electrolysis device 2 on the material 41 to be processed are arranged so that the pad 38
1, the electrode 37 and the material 41 to be treated.
Is connected to the power source 43 via the lead wire 42 and energized,
The scale or the like is removed from the material 41 to be processed which is the anode. The paste is leached from the pad 38 and the electrode 3
7 and the material 41 to be processed are continuously supplied.

INDUSTRIAL APPLICABILITY The electrolytic treatment apparatus of the present invention can be suitable for electrolytic pickling of metal materials, passivation treatment, plating and the like.

<Examples> Hereinafter, the present invention will be specifically described with reference to Examples.

In this embodiment, the device of the present invention is applied to electrolytic pickling (descaling) of stainless steel.

(1) Sample material SUS304 stainless steel (6mm thickness x 300mm x 300
mm) Steel plate with black skin (2) Paste Sodium polyacrylate 5 wt% Sulfuric acid 10 wt% Water 85 wt% Silicon dioxide 7 wt% Sulfuric acid 10 wt% Water 83 wt% Table 1 shows the paste and Table 2 shows the paste.

(3) Conditions for electrolysis etc. are shown in Tables 1 and 2.

(4) Device of the present invention The paste supply devices (shown as A and B in the table) of Figs. 1 and 2 were assembled as shown in Figs. 3 to 5, and electrolyzed as shown in Fig. 6. Processed.

In the table, the shapes of the pad and the electrode are distinguished, and those of FIG. 3 are the vertical tilt type, those of FIG.
The one in the figure is called a zigzag type.

(5) Comparative Example As a comparative example, a grinder finish and pickling with a 10% sulfuric acid solution were mentioned.

(6) Evaluation The evaluation criteria are as shown below each table.

In each of the pastes of the present invention, there was no surface unevenness and the degree of descaling was perfect. A paste containing 10% by weight sulfuric acid is better than a paste containing 10% by weight sodium sulfate.
The efficiency was good.

There is some surface unevenness in the grinder finish of the comparative example,
In pickling with a 10% sulfuric acid solution, scale could not be removed without brushing with a brush or the like. 1 in the comparative example
Even if the treatment was performed for 0 or 90 minutes, descaling could not be completed completely and the efficiency was poor.

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

Therefore, the characteristics of the present invention are better exhibited especially when treating only one surface side such as stainless clad steel or treating only a part of the structure.

Further, according to the present invention, the electrolysis equipment does not particularly need to be fixed, and by selecting an appropriate electrode shape and paste, electrolytic pickling of any metal structure and metal product surface, electropolishing,
The passivation treatment, the electrolytic coloring treatment, the electroplating treatment and the like can be easily and quickly performed without causing surface unevenness.

[Brief description of drawings]

1 and 2 are partial cross-sectional side views of the paste supply device used in the device of the present invention. FIGS. 3, 4 and 5 are various structural examples of the electrolysis apparatus used in the apparatus of the present invention, and FIGS. 3a, 4a and 5a are partial sectional side views, FIG. 3b, and FIG. 4b and 5b are bottom views. FIG. 6 is a diagram showing a usage mode of the electrolytic treatment apparatus for the surface of a metal material according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Paste supply device, 2 ... Electrolysis device, 11 ... Lower cylinder, 12 ... Upper cylinder, 13 ... Collar, 14 ... Shaft, 15 ... Screw, 16 ... Piston, 17 ... ... Nut, 18 ... Paste chamber, 19 ... Weight, 20 ... Paste discharge port, 21 ... Cock, 22 ... O-ring, 31 ... Housing, 32 ... Paste supply port, 33 ... Wiring port, 34 ... Paste trap chamber, 35 ... Bottom plate, 36 ... Paste discharge hole, 37 ... Electrode, 38 ... Pad, 39 ... Hole, 40 ... Screw, 41 ... Processed material, 42 ... Lead wire, 43 ... Power supply,

Front Page Continuation (72) Inventor Yoshio Miyano 1 Kawasaki-cho, Chiba City, Chiba Prefecture, Technical Research Headquarters, Kawasaki Steel Co., Ltd. (56) References Japanese Unexamined Patent Publication No. 57-171689 (JP, A) Actual No. 61-143761 (JP, U)

Claims (3)

[Claims] 1. An electrode provided with a plurality of grooves arranged in parallel on a surface facing a metal material to be surface-treated at a predetermined interval and holes at the bottom of each groove, the electrode being attached to a bottom surface, A paste-like electrolyte trap having a paste-like electrolyte supply hole communicating with the hole on the bottom surface, an upper end portion closely adhered to each groove, and a lower end portion abutted on the metal material; A plurality of pads for holding and leaching the paste electrolyte supplied from the holes, and a paste electrolyte pumping device for pumping the paste electrolyte to the pads via the paste electrolyte trap, A paste electrolyte flow rate adjusting device for adjusting the supply amount of the paste electrolyte pumping device, and held by the plurality of pads between the metal material and the electrode,
Further, an electrolytic treatment apparatus for the surface of a metal material, comprising: a power supply means for supplying electricity through a paste-like electrolytic solution leached from the power supply means. 2. The electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein the plurality of pads are arranged in parallel. 3. The electrolytic treatment apparatus for the surface of a metal material according to claim 1, wherein the plurality of pads are arranged in a bent manner.