JPH01294899A - Device for electrolyzing metallic material surface - Google Patents

Abstract

PURPOSE:To obtain the title device for electrolyzing a metallic material surface capable of being applied in the surface treating technique for a metallic material and especially in various kinds of efficient and high-quality treatment by providing a device for supplying an appropriate amt. of a pasty electrolyte, and forming the electrode and pad into specified shapes. CONSTITUTION:A paste feeder 1 and an electrolyzer 2 are placed on a metallic material 41 to be treated so that the pad 38 is brought into contact with the material 41. Under such conditions, an electrode 37 and the material 41 are connected to a power source 43 through a lead wire 42, and energized. As a result, the scales, etc., are removed from the material 41 used as an anode. Meantime, the pasty electrolyte is oozed out from the pad 38, and sufficiently and continuously supplied between the electrode 37 and the material 41. The electrolyzer can be applied in the electrolytic pickling, passivation, and plating of a metallic material. The symbol 32 in the figure is a paste supply port, the symbol 34 is a paste trap chamber, and the symbol 36 is a paste discharge hole.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is capable of efficiently removing oxidized scale adhering to the surface of metal materials, especially the surface of steel materials such as stainless steel.
The present invention relates to an apparatus that easily performs electrolytic treatments such as electrolytic polishing, passivation treatment, coloring treatment, and electroplating.

<Conventional technology> Conventionally, the treatments applied to the surface of metal materials include descaling,
Examples include surface polishing, passivation treatment, coloring treatment, and plating, and methods include mechanical treatment, chemical treatment, and electrochemical treatment, respectively. However, the conventional processing method for konera has the following drawbacks.

For example, for descaling treatment, a typical mechanical treatment is °C shot blasting, but there are environmental problems such as the generation of dust and noise, making it difficult to perform on-site treatment directly at the treatment site. In addition, since a work-hardened layer remains on the surface, it has disadvantages such as having a negative impact on corrosion resistance or mechanical properties.

As a chemical treatment, there is a descaling treatment by so-called pickling, but the treatment takes a long time, and there are environmental problems due to the use of acid solutions, and there are disadvantages in that on-site treatment is difficult. In recent years, an in-situ pickling treatment method using a pickling paste has been carried out, but it requires a long treatment time and has the disadvantage that pickling tends to be uneven.

Electrochemical treatment includes descaling treatment by so-called electrolytic pickling, which enables treatment in a short time, but has the disadvantage that on-site treatment is difficult due to limitations on solutions and equipment.

<Problems to be Solved by the Invention> The purpose of the present invention is to solve the above-mentioned problems of the prior art and to develop a surface treatment technology for metal materials, particularly an electrochemical method that can perform various treatments efficiently and with high quality. The object of the present invention is to provide an apparatus that enables on-site treatment, which is a decisive drawback of treatment methods. In other words, the aim is to provide a device that enables high-quality processing by making improvements to the appropriate amount of paste supply device and the shape of the electrodes and pads on the electrolytic surface, ensuring a stable current and extending the life of the pads. It is in.

Means for Solving the Problems> The present invention provides a plurality of grooves arranged in parallel at predetermined intervals on a surface facing a metal material to be surface-treated, and an electrode provided with a hole at the bottom of each groove. a pasty electrolyte trap with the electrode attached to the bottom surface and a pasty electrolyte supply hole communicating with the hole in the bottom surface; a plurality of pads that are in contact with the metal material and hold and exude the pasty electrolytic solution supplied from the plurality of holes; and a pasty electrolytic solution is pumped to the plurality of pads via the pasty electrolytic solution trap. a pasty electrolyte pumping device that adjusts the supply of the pasty electrolyte pumping device; a pasty electrolyte flow rate adjusting device that adjusts the supply of the pasty electrolyte pumping device; The present invention provides an apparatus for electrolytic treatment of a surface of a metal material, comprising: a power supply means for supplying current through a pasty electrolytic solution leached;

The present invention also provides a countersunk electrode having a plurality of holes on the surface facing the metal material to be surface-treated, and the countersunk electrode is attached to the bottom surface, and a space is formed between the bottom surface and the countersunk electrode. a cap-type pad that covers the countersunk electrode and is attached to the periphery of the electrode support means to hold and exude a paste electrolyte supplied from the plurality of holes; and the cap. a pasty electrolytic solution pumping device that pumps the pasty electrolytic solution to the mold pad through the space; a pasty electrolytic solution flow rate adjustment device that adjusts the supply of the pasty electrolytic solution pumping device; The present invention provides an apparatus for electrolytic treatment of a surface of a metal material, comprising: power supply means held by the pad between the counter electrode and the power supply means for supplying electricity through a paste-like electrolytic solution leached from the pad.

The present invention further provides an electrode having a plurality of holes on the surface facing the metal moon to be surface-treated, and a paste-like electrode having the electrode attached to the bottom surface and a paste-like electrolyte supply hole communicating with the holes on the bottom surface. an electrolyte trap; a cap-type pad that covers the electrode and is airtightly attached to the periphery of the pasty electrolyte trap to hold and leach the pasty electrolyte supplied from the hole; and the cap. a pasty electrolyte pumping device that pumps the paste electrolyte to the mold pad via a paste electrolyte trap; a paste electrolyte flow rate adjustment device that adjusts the flow rate of the paste electrolyte pumping device; and the metal material. The present invention provides an apparatus for electrolytic treatment of a surface of a metal material, having a power supply means held by the cap-type pad between the electrodes and a power supply means for supplying electricity through a paste-like electrolyte solution leached from the cap-type pad.

The present invention will be explained in more detail below.

The present inventors conducted research to enable these conventional electrochemical on-site treatments, and as a result, they arrived at the present invention.

In order to carry out electrochemical processing on-site, it is necessary to prepare a paste electrolyte (hereinafter referred to as paste) supply device and an electrolysis device to ensure the stable electric current required for electrolysis. As for paste, due to its high viscosity,
A device is required to control the appropriate amount depending on the supply method and the processing surface, and in order to ensure the stable current required for electrolysis, the shape of the electrode, the shape of the pad, the distance between the processing surface and the electrode, and the distance between the pads are required. It is essential to consider the spacing, etc.

That is, the apparatus for electrolytically treating the surface of a metal material according to the present invention includes a paste supplying apparatus 1 and an electrolytic apparatus 2.

First, the paste supply device 1 will be explained. Since the viscosity of the paste varies depending on the purpose for which it is to be processed, it 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.

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

As can be seen from FIG.
1 and an upper cylinder 12 fitted therein. Upper cylinder 1
A shaft 14 is fixed to the shaft 2 by a screw 15 via a collar 13 fixed thereto. shaft 14
A piston 16 is fixed in the middle by a nut 17,
A paste chamber 18 is defined between the piston 16 and the upper cylinder 11.

At the top of the upper cylinder 12 is a weight 19 necessary for supplying an appropriate amount of paste.
It is structured so that it can be placed on the screen.

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

The amount of paste supplied is controlled by a weight 19 placed on the upper cylinder 12 and a cock 21 provided at the discharge port 20. Since the apparatus shown in FIG. 1 is used for paste having a relatively low viscosity, it is preferable that the shaft 14 be configured to extend downward from the piston 16 for a considerable length into the paste discharge port 20. The amount of paste discharged can be appropriately controlled.

Since the apparatus shown in FIG. 2 is used for pastes having relatively high viscosity, this is not necessary, and the length of the piston 16 is sufficient. The device shown in FIG. 2 has the same configuration as the device shown in FIG. 1 except for this point, so a 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 paste from sinking, it is preferable to insert an O-ring 22 between the upper cylinder 11 and the piston 16.

Next, Figures 3a and 3b describe the electrolytic device 2 for ensuring a stable current on the electrolytic surface and obtaining a long service life.
This will be explained using figures. In order to achieve such a purpose, it is necessary to devise a configuration of electrodes and pads in the electrolytic device 2.

As is clear from FIGS. 3a and 3b, the electrolytic device 2 includes a housing 31, the upper part of which is provided with a paste supply port 32 and a wiring port 33.
2 is a paste discharge port 20 of the paste supply device 1 described above.
The contact piece, :l! t will be done.

The housing 31 defines a paste trap chamber 34 therein, and a paste discharge hole 36 is formed in the bottom plate 35 of the housing 31.
is formed. Is the paste trap chamber 34 electrolytic?
Filling with Fi (paste) serves to uniformly spread the paste to pads to be described later.

An electrode 37 is disposed below the bottom plate 35 of the housing 31, and has a number of holes 39 formed therein for passing the paste and supporting the pads 38. pad 3
8 is fixed in the shape of a strip by a stepped portion 39a of the hole 39 of the electrode 37, and as shown in FIG. 3b, the pad 38 is disposed obliquely. In this device, the paste supplied from the paste supply device 1 enters the trap chamber 34, and the hole 36 formed in the bottom plate 35 of the housing 31,
It reaches the pad 38 through a hole 39 formed in the electrode 37.

Here, the gap between pads is very important. If this gap is small, scale etc. from the material to be treated will accumulate in the gap, making it difficult for current to flow. Furthermore, if this gap is too large, spaces tend to form between the pads, making it difficult to hold the paste and making it impossible to ensure a stable current.

Therefore, the spacing between the pads should be such that such a situation does not occur, but it is most preferable to make the spacing approximately equal to the thickness of the pad, and the thickness of the pad to be approximately 5 mm. In addition, in order to extend the life of the electrode 37,
It is best to use stainless steel, copper plate, etc.

To ensure a stable current, the distance between the treatment surface and the TL pole must be selected appropriately.

Current can be secured even if this distance is less than several tens of mm, but 10
It is preferable to set it to n+m or less. This distance decreases as the pad wears down, but it is preferable to replace the pad when it reaches 2 to 3 mm. This is because if the electrode and the material to be treated are short-circuited, the treatment will not be possible.

The material of the pad has the greatest impact on longevity, and the material of the pad should be woven or knitted fabric such as polyester fiber, glass fiber, or alumina fiber, or an insulator.
In order to extend the service life, it is suitable to use these fibers impregnated with an abrasive.

The pad can easily change processing conditions, paste type, etc., and can be cleaned, so it is good to consider measures to improve workability.

Other configuration examples of the electrolyzer used in the present invention will be explained with reference to FIGS. 4 to 7. Regarding these, only the points different from the apparatus shown in FIG. 3 described above will be explained.

In the example shown in FIGS. 4a and 4b, the pad 38 has a cap shape to cover the bottom of the housing 31,
The ends are fixed with screws 40. A dish-shaped electrode 37 is disposed between the cap-shaped pad 38 and the bottom plate 35 of the housing 31. In addition, the paste supply port 32
is connected to a paste discharge hole 36 formed in the bottom plate 35 of the housing 31, and the paste trap chamber 34 is a space.

The example shown in FIGS. 5a and 5b is a modification shown in FIGS. 4a and 4b, in which the paste supply port 32 communicates with the paste trap chamber 34, and the paste discharge hole in the bottom plate 35 of the housing 31. 36 and the hole 39 of the electrode 37 are aligned.

In the example shown in FIGS. 6a and 6b, the electrodes 37 and pads 38 are arranged in the same way as in the example shown in FIGS. This is what I did.

The example shown in FIGS. 7a and 7b is a modification of the example shown in FIGS. 6a and 6b, in which the pads 38 are arranged in a zigzag pattern to facilitate scale evacuation as shown in FIG. 7b. It's something I've done.

The apparatus for electrolytic treatment of the surface of a metal material according to the present invention is used as diagrammatically shown in FIG. The paste supply device 1 and the electrolytic device 2 are placed on the material to be processed 41 so that the pads 38 are in contact with the material to be processed 41, and the electrode 37 and the material to be processed 4 are placed.
1 is connected to a power source 43 via a lead wire 42 and energized, scale and the like are removed from the material to be treated 41 serving as an anode. The base) leaches out from the pad 38 and continues to be sufficiently supplied between the electrode 37 and the material to be treated 41.

The electrolytic treatment apparatus of the present invention can be applied to electrolytic pickling, passivation treatment, plating, etc. of metal materials.

<Example> The present invention will be specifically explained below using examples.

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

(1) Test material 5US304 stainless steel tiff (6mm thickness x 300m
mx 300 mm) steel plate with black skin (2) Paste■ Sodium polyacrylate 5wt% sulfuric acid
10wt% Water 85wt%
■ Silicon dioxide 7wt% sulfuric acid
10wt% Water 83wt%
Base paste (■) is shown in Table 1, and paste (■) is shown in Table 2.

(3) Conditions for electrolysis, etc. Shown in Tables 1 and 2.

(4) Assemble the paste supply devices of the present invention in Figs. 1 and 2 (indicated as A and B in the table, respectively) as shown in Figs. 3 to 7, and electrolyze the paste as shown in Fig. 8. Processed.

In addition, in the table, the shapes of the pad and TL pole are distinguished,
The one in Figure 3 is a vertical tilt type, the one in Figure 4 is a flat type, and the one in Figure 6 is a flat type.
The one shown in the figure is called the vertical parallel type, and the one shown in Figure 7 is called the zigzag type.

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

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

In the present invention examples, the surface unevenness of any paste was lx <,
The degree of descaling was complete. The paste containing 10% by weight sulfuric acid was more efficient than the paste containing 10% by weight sodium sulfate.

The grinder finish of the comparative example has some surface unevenness,
When pickling with a 10% sulfuric acid solution, scale could not be removed without brushing with a brush. In the comparative examples, complete descaling was not possible even after treatment for 10 minutes or 90 minutes, and the efficiency was poor.

<Effects of the Invention> As detailed above, by using the apparatus for electrolytic treatment of the surface of metal materials of the present invention, surface treatment of all kinds of metal materials can be performed on-site at low cost.

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

Further, according to the present invention, there is no need to fix the electrolytic equipment in particular, and by selecting an appropriate electrode shape and paste, electrolytic pickling, electrolytic polishing, and electrolytic polishing of the surfaces of all metal structures and metal products can be performed.
Treatments such as passivation treatment, electrolytic coloring treatment, and electroplating can be easily and quickly performed without causing surface unevenness.

[Brief explanation of the drawing]

1 and 2 are partially sectional side views of a paste supply device used in the apparatus of the present invention. Figures 3, 4, 5, 6, and 7 show various configuration examples of the electrolyzer used in the device of the present invention, and Figures 3a, 4a, 5a, and 6a. 7a is a partially sectional side view, and FIGS. 3b, 4b, 5b, 6b, and 7b are bottom views. FIG. 8 is a diagram showing how the apparatus for electrolytic treatment of metal surfaces according to the present invention is used. Explanation of symbols 1... Base supply device, 2... Electrolysis device, 11.
... lower question, 12... upper tube, 13... collar, 14... shaft, 15... screw,
16... Piston, 17... Nut,
18... Paste chamber, 19... Weight,
20... Paste discharge port, 21... Cock,
22...0 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 ... material to be treated, 42 ... lead wire, 43 ... power supply,

Claims (5)

[Claims] (1) A plurality of grooves arranged in parallel at predetermined intervals on a surface facing the metal material to be surface-treated, an electrode provided with a hole at the bottom of each groove, and the electrode is attached to the bottom surface, and a pasty electrolyte trap having a pasty electrolyte supply hole communicating with the hole on the bottom surface; a plurality of pads for holding and exuding pasty electrolyte supplied from the holes; a pasty electrolyte pumping device for pumping the pasty electrolyte to the plurality of pads via the pasty electrolyte trap; and the paste. a pasty electrolyte flow rate adjustment device that adjusts the supply amount of the pasty electrolyte pumping device;
An electrolytic treatment apparatus for the surface of a metal material, further comprising: a power supply means for supplying electricity via a paste-like electrolytic solution leached from the electrolytic solution. (2) A countersunk electrode having a plurality of holes on the surface facing the metal material to be surface-treated, and an electrode support that attaches the countersunk electrode to a bottom surface and forms a space between the bottom surface and the countersunk electrode. means; a cap-type pad that covers the countersunk electrode and is attached to the periphery of the electrode support means for holding and exuding the pasty electrolyte supplied from the plurality of holes; a pasty electrolytic solution pumping device that pumps the pasty electrolytic solution through the space; a pasty electrolytic solution flow rate adjustment device that adjusts the supply amount of the paste electrolytic solution pumping device; the metal material and the countersunk electrode; An apparatus for electrolytic treatment of a surface of a metal material, comprising: a power supply means that is held by the pad between the pads and supplies electricity through a paste electrolytic solution leached from the pad. (3) An electrode having a plurality of holes on the surface facing the metal material to be surface-treated, and a paste electrolyte solution having the electrode attached to the bottom surface and a paste electrolyte supply hole communicating with the holes on the bottom surface. a trap; a cap-type pad that covers the electrode and is airtightly attached to the periphery of the pasty electrolyte trap to retain and leach the pasty electrolyte supplied from the hole; a pasty electrolytic solution pumping device that pumps the pasty electrolytic solution through a pasty electrolytic solution trap; a pasty electrolytic solution flow rate adjustment device that adjusts the flow rate of the paste electrolytic solution pumping device; An apparatus for electrolytic treatment of a surface of a metal material, comprising a power supply means held by the cap-type pad in between and supplying electricity through a paste-like electrolyte solution leached from the cap-type pad. (4) The electrolytic treatment apparatus for a metal surface according to claim 1, wherein the pads are arranged in parallel. (5) The apparatus for electrolytic treatment of a metal surface according to claim 1, wherein the pad is arranged in a bent manner.