KR20180091304A - Acid treatment device for wire rod and acid treatment method using same - Google Patents

Abstract

The present invention relates to an acid treatment device for a wire, which mounts a copper electrode in an acid treatment tank, in which a steel or non-ferrous material is mounted, to perform acid treatment, and an acid treatment method using the same. According to the present invention, in the case of a low concentration hydrochloric acid, acid treatment is efficiently performed in a short period of time and the surface roughness of a wire is basically dissolved from a surface protrusion part of a scale to provide higher removal efficiency than that of a scale by mechanical processing. In particular, unlike an existing method, a low concentration of hydrochloric acid is continuously used, such that the generation amount of waste hydrochloric acid. Moreover, a deformed layer on the surface of the wire is moved and flattened to reduce a surface area, thereby providing an effect of increasing acid resistance. Moreover, the surface is polished up to a deeply engraved portion, such as a groove of a steel material, not penetrated by an acid solution to increase metal coating power, such as painting, plating, and plasma, thereby providing an effect of improving adhesion performance. According to the present invention, the acid treatment apparatus comprises an acid treatment tank and a holding plate.

Description

Technical Field [0001] The present invention relates to an acid treatment apparatus for wire rod and an acid treatment method using the same,

The present invention is characterized in that an acid treatment can be performed at a low temperature in a short period of time by mounting a copper electrode in an acid treatment tank in which steel wires or non-iron wire rods are mounted, and the iron ions dissolved in the acid solution The present invention relates to an acid treatment apparatus for a wire rod and an acid treatment method using the same, which is characterized by being an environmentally friendly method which can reduce the amount of waste acid solution generated because an acid treatment can be efficiently performed even with a low concentration acid solution.

The wire rod is manufactured by hot rolling in a billet as a steel material. In the cooling process between 570 ° C and 1,100 ° C, as shown in FIG. 1, the wire rod necessarily has a Fe ₂ O _{3 (Hematite), Fe 3 O 4} (Magenetite), referred to the order of scale formed, the scale of the _{Fe 2 O 3, Fe 3 O} 4 has a superlattice (Super lattice) of FeO (Wuestite) and the acid using hydrochloric acid It does not dissolve well even after treatment.

In general, all steel products must be plated or subjected to a process such as drawing or rolling in order to be processed into a product.

Among the many steel materials, the process of hydrochloric acid treatment used in the drawing of wire of cold heading quility (CHQ) and hard wire is to use industrial hydrochloric acid with a concentration of 35% And 22 ~ 23%, respectively. The immersion time is usually 20 to 90 minutes, depending on the type of steel.

The difference in the acid treatment time is that the concentration of hydrochloric acid is lowered to 10 to 13% by the concentration of iron chloride generated by dissolving the scale formed on the wire surface in the acid treatment solution in the acid treatment solution in the acid treatment, ~ 150g / ℓ, so the acid treatment takes a long time. In addition, in the case of boron steels (51B20, 10B21, etc.), it is difficult to perform acid treatment to such an extent as to perform hydrochloric acid treatment after performing shot blasting to help hydrochloric acid treatment In addition, since hydrochloric acid at a low concentration is not properly treated with acid, a large amount of waste acid is generated.

If the wire is not acid treated to a clean surface in a short period of time due to the above-described problems, a dark brown smut is formed on the surface of the wire rod immersed in the hydrochloric acid solution for a long time. , The compound layer with the Fe matrix is not properly formed, so that the mold is broken during the forging process of the cold forming molder, resulting in a great loss such as the breakage of the mold.

Accordingly, various techniques for improving the acid treatment efficiency of the wire rod have been developed to solve the above problems.

Patent Document 1 discloses a hot-rolled coil, which is a typical steel, as an example of a hot-rolled coil, which is a typical steel, and a hot-rolled coil, which is a typical steel as shown in FIG. 2 (b), includes a small amount of FeO, Fe ₂ O ₃ and a large amount of Fe ₃ O ₄ , but since the center portion of the coil is almost Fe ₃ O ₄ and the metal iron, and the Fe ₂ O ₃ is present at the end portion of the coil width, the acid cleaning effect is lowered. Therefore, layer of the coil of the outermost layer that is Fe ₂ O ₃ as shown sodium powder in Fig. 2 (a) is applied to the subject is and peeling hwieoseo arching, and even the inner layer that is Fe ₃ O ₄ + FeO mainly , It is suggested to increase the contact area between the acidic solution and the scale in the acid treatment to increase the acid cleaning effect.

In the case of Patent Documents 2 and 3, as shown in Figs. 3 and 4, the steel material is subjected to the acid treatment using a plurality of acid treatment tanks, so that the scale of the facility is large, the consumption amount of the acid treatment solution is large Accordingly, there is a problem that a large amount and a waste liquid are generated.

Patent Document 1: Korean Patent Registration No. 10-1980-0001349 (published on Nov. 17, 1980) Manufacturing method of a low alloy steel having an oxide film excellent in acidity Patent Document 2: Korean Patent Registration No. 10-0527788 (published on November 09, 2005) Continuous pickling method and continuous pickling apparatus Patent Document 3: Korean Patent Laid-Open Publication No. 10-2003-0066430 (published on August 09, 2003) Plate or wire rod pickling apparatus

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems as described above, and it is an object of the present invention to provide a method of manufacturing a semiconductor device in which a copper electrode is mounted in an acid treatment tank for mounting steel wire or non- , Iron ion dissolved in the acid solution is increased in the acid treatment process, so that it is possible to efficiently treat the acid solution even at a low concentration of the acid solution which has been used for a long time to lower the acid concentration, And an acid treatment method using the same.

The present invention has been made to solve the above problems and has an object to provide an acid treatment tank 10 in which a bottom surface 11 and a side wall 12 are integrally formed and an upper part is opened, And a holder (20) for suspending the acid solution in the acid treatment tank (10) where the acid solution is stored.

The hanger 20 is characterized in that the upper frame 21 and the lower frame 22 are integrally connected to the lower portion of the upper frame.

The acid treatment tank 10 is provided with a copper plate 13 having a negative electrode on its side wall 12b and a side wall 12b corresponding to the side wall 12a, A copper bar 14 having a positive electrode is mounted on a top portion of the hanger so that the hanger 20 is connected to the lower surface of the upper frame 21 and the upper surface of the lower frame 22, Is mounted.

The present invention is characterized in that a wire rod S is mounted on a lower frame 22 of a hook 20 on which a copper bar 23 is mounted along the lower face of the upper frame 21 and the upper face of the lower frame 22 The copper bar 14 of the acid treatment tank 10 including the side walls 12a and 12b on which the copper plates 13 are mounted and the side walls 12c and 12d on which the copper bars 14 are installed, S is immersed in the acid solution (A), and the copper plate (13) and the copper bar (14) are subjected to an acid treatment by applying an electric current to the copper plate (13) Another solution to the problem.

The copper plate 13 mounted on the side walls 12a and 12b has a negative electrode and the copper bar 14 mounted on the upper ends of the other side walls 12c and 12d applies a current do.

The present invention is capable of efficient acid treatment in a short time even in the case of a low concentration acid solution and the removal efficiency is much higher than the scale by machining because the roughness of the surface of the wire rod is basically dissolved from the surface projecting portion of the scale, The amount of iron ions dissolved in the acid solution during the acid treatment is increased, so that it is possible to efficiently treat the acid even at a low concentration of the acid solution which is used for a long time and the concentration of the acid is lowered. Environmentally friendly equipment and method.

In addition, the acid-treated wire material according to the present invention improves corrosion resistance by removing the strained layer of the surface of the wire rod and reducing the surface area by flattening the surface, and polishing the surface to the depth hole portion where the acid solution is not penetrated It has an effect that adhesion performance is improved by increasing the metal coating power such as painting, plating, and plasma.

1 is a sectional view showing a state in which an oxide film layer is formed on the surface of a steel material.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a steel material,
FIG. 3 and FIG. 4 are schematic views showing a conventional acid treatment apparatus provided with plural acid treatment tanks. FIG.
5 is a perspective view showing an apparatus for treating a wire rod according to a preferred embodiment of the present invention.
6 is a side view showing a state where a copper bus bar mounted on the top of a side wall of an acid treatment tank according to the present invention is mounted.
7 is a side view showing a state in which a copper bar is mounted on a hook according to the present invention.
Fig. 8 is a perspective view showing a state in which a wire rod is mounted on a lower frame of a hanger of the acid treatment apparatus of Fig. 5; Fig.
Fig. 9 is a cross-sectional view showing a state in which a wire material is settled in an acid treatment vessel of the acid treatment apparatus of Fig. 5 and subjected to acid treatment. Fig.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, in which only parts necessary for understanding the technical structure of the present invention will be described. It should be noted that it will be omitted so as not to be distracted.

5 to 9, in which the bottom surface 11 and the side wall 12 are integrally formed, and the upper part is opened by acid treatment And a hook 20 for suspending the wire rod S on the lower frame 22 and causing the wire rod S to settle in the acid treatment tank 10 in which the acid solution is stored.

In the present invention, it is preferable that the acid treatment tank 10 and the hanger 20 are made of fiber reinforced plastic (FRP) as an acid resistant material, and not necessarily limited to a fiber reinforced plastic (FRP) Are all available.

7, the hook 20 includes an upper frame 21 and a lower frame 22 in the lower part of the upper frame, which are integrally coupled to each other, as shown in FIG. 8 And the wire rods S are mounted on the lower frame 22 together.

The acid treatment tank 10 is provided with a copper plate 13 having -electrodes on its side wall 12b and a side wall 12b corresponding to the side walls 12a and 12c of the side walls 12c and 12d, And a copper bar (14) having a positive electrode is mounted on a portion where the hanger is seated.

The hanger 20 is mounted with a copper bar 23 along the lower surface of the upper flame 21 and the upper surface of the lower flame 22.

In the present invention, the electrode means to be respectively mounted on the hanger 20 and the acid treatment tank 10 is not limited to the copper bar 14 but may be used in the form of a copper rod or a copper plate.

The hook member 20 according to the present invention is characterized in that when the moving means is used to immerse the wire material in the acid solution A of the acid treatment tank 10 after the wire member S is mounted on the lower frame 22, A plurality of hooks 24 may be formed on the upper portion of the upper frame 21. [

After placing the acid solution A in the acid treatment tank 10, the jig 20 is placed on the side walls 12c and 12d of the acid treatment tank 10 so that the wire member S is immersed in the acid solution A. The acid treatment tank 10 is sandwiched by the side walls 12a and 12b and the upper surface of the side walls 12a and 12b is exposed to a current of 20 to 200 A / And the copper bars 14 of the side walls 12c and 12d on which the hooks 20 are mounted have positive electrodes and the hooks 20 And the copper bar 23 and the wire rod S are made to have a + electrode.

In the present invention, when the DC voltage and the current applied to the electrode are less than the above range, the acid cleaning effect of the wire rod S may deteriorate due to the weakening of the electrolysis power. If the acid treatment amount is smaller than the defined range, there is no particular problem if the acid treatment solution is vaporized and shrunk, but the wire rod is usually deposited.

Therefore, when the wire rod S immersed in the acid solution A of the acid treatment tank 10 is picked up by the acid solution A, fine pores of iron oxide scale formed on the surface of the wire rod S having the + And the iron oxide scale formed on the surface of the wire rod S, typically having a thickness of 0.1 to 0.3 mm, is dissolved within 3 to 5 minutes.

At this time, when iron (Fe) ions contained in the iron oxide component dissolved in the acid solution (A) reach a concentration of 120 to 150 g / L in the acid treatment tank 10, the acid treatment solution becomes saturated concentration, Can be expected. However, due to the electrolysis effect, it is possible to increase the iron ion at a saturation concentration or higher to increase the acid treatment effect, and thus to reduce the amount of the acid solution (A) used. For example, waste acid with a high iron ion concentration can be reused as a magnetic fluid or a magnetic material with iron chloride as the main raw material for industrial use.

When the concentration of the acid solution (A) is lowered in the acid treatment process of the wire rod (S), the acid treatment time is shortened by increasing the intensity of the current to improve the productivity and quality of the pickled wire (S) It is an eco-friendly device that can suppress the generation of fume of chlorine (Cl) due to the increase and maintain a comfortable working environment.

In the present invention, the metal to be subjected to the acid treatment has been described by taking the wire material S as an example, but it is not necessarily limited to the wire material S, but may be applied to all kinds of steel or non-iron plate materials, .

The method of treating an acid of a wire using the acid treatment apparatus for wire rod according to the present invention will be described in detail as follows.

The method for acid treatment of the wire according to the present invention is characterized in that the lower frame 22 of the hook 20 on which the copper bar 23 is mounted is provided along the lower face of the upper flame 21 and the upper face of the lower flame 22 The wire rod S is mounted.

The copper bar 14 of the acid treatment tank 10 made up of the side walls 12a and 12b on which the copper plate 13 is mounted and the side walls 12c and 12d on which the copper bar 14 is wound is wound on the upper surface of the copper bar 14, S is immersed in the acid solution A and the copper plate 13 and the copper bar 14 are subjected to an acid treatment by applying an electric current thereto.

At this time, when a current of 20 to 200 A / cm 2 is applied to the copper plate 13 and the copper bar 14 by a DC voltage of 10 to 20 V by using the rectifier 30, the acid treatment tank 10 is exposed to the side walls 12a and 12b And the copper bars 14 of the side walls 12c and 12d on which the hooks 20 are mounted have positive electrodes and the hooks 20 And the copper bar 23 and the wire rod S are subjected to acid treatment with the addition of a positive electrode and the wire rod S being acid treated.

The acid solution (A) used in the present invention is typically used when diluting industrial hydrochloric acid having a concentration of 35% with water to have a concentration of 22 to 23% According to the conventional acid treatment method, the acid treatment time is 20 to 90 minutes, whereas the acid treatment is possible in 3 to 5 minutes.

Further, in the case of the conventional acid treatment method, the concentration of hydrochloric acid is lowered to 10 to 13% due to the concentration of iron chloride generated as the scale formed on the surface of the wire is dissolved in hydrochloric acid during the long-term acid treatment, The present invention has an effect of acid-treating a product such as an alloy steel, a high carbon steel or the like in a short period of time even with such a low-concentration acid solution (A).

The acid solution (A) used in the present invention can be applied to any solution that can be acid-picked, such as sulfuric acid, hydrochloric acid, nitric acid or hydrofluoric acid.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples.

Using the acid processing apparatus for wire rope according to the present invention, the wire rods were subjected to acid treatment at room temperature according to the methods of Examples 1 to 4 and Comparative Examples 1 to 4 as shown in the following Table 1, Were evaluated.

Each of the wire rods used in Examples 1 to 4 and Comparative Examples 1 to 4 was subjected to acid treatment using ten wire rods of S45C material (length 30 cm) each having a diameter of 11 mm formed with an oxidation scale of 1 mm in thickness.

Test conditions and
Evaluation items Example Comparative Example One 2 3 4 One 2 3 4 Hydrochloric acid concentration wt% 12 12 12 12 12 16 20 23 Voltage V 10 10 20 20 - - - - electric current mA / cm ² 20 200 20 200 - - - - Number of samples EA 10 10 10 10 10 10 10 10 Wire surface
condition - thick
grey


Surface roughness
Good a little
Dark gray

Surface roughness
Good
grey



Surface roughness
Good bright
grey


Surface roughness
Good Sword brown



Surface roughness
Bad Sword brown



Surface roughness
Bad Sword brown



Surface roughness
Good and rough Sword brown



Surface roughness
Good and rough Acid treatment
time minute 15 8 5 3 80 60 30 20 Wire surface condition: Observed with naked eyes

According to the contents of the above Table 1, although the wire processed by the methods of Examples 1 to 4 was shorter than the wire treated by the methods of Comparative Examples 1 to 4, It was confirmed that the surface state of one wire rod was good and the wire rod treated with the methods of Comparative Examples 1 to 4 was grizzled while the wire rods treated with the methods of Examples 1 to 4 were in good color .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments and that various changes and modifications may be made therein without departing from the spirit and scope of the invention. It will be appreciated by those of ordinary skill in the art that changes are possible.

10: Acid treatment tank
11: bottom surface 12, 12a, 12b, 12c, 12d:
13: copper plate 14: copper bar
20: Hanger 21: Upper frame
22: lower frame 23: copper bar
24: Hook 30: Rectifier
S: wire rod A: acid solution

Claims (6)

An acid treatment tank 10 formed integrally with the bottom surface 11 and the side wall 12 and having an open top,
(20) for suspending the wire rods (S) on the lower frame (22) and for sinking the roots to the acid treatment tank (10) in which the acid solution is stored.
The method according to claim 1,
Wherein the hanger (20) comprises an upper frame (21) and a lower frame (22) formed integrally below the upper frame.
The method according to claim 1,
The acid treatment tank 10 is equipped with a copper plate 13 having a -electrode on each of the side walls 12b corresponding to the side walls 12a,
Characterized in that an upper end of the side wall (12c, 12d) to which the copper plate is not mounted is equipped with a copper bar (14) having a + electrode on the part where the catch is seated.
3. The method of claim 2,
Characterized in that the hanger (20) is equipped with a copper bar (23) along the lower face of the upper flame (21) and the upper face of the lower flame (22).
The wire rods S are mounted on the lower frame 22 of the hook 20 on which the copper bar 23 is mounted along the lower face of the upper frame 21 and the upper face of the lower frame 22,
The wire rods 14a and 12b are formed on the copper bar 14 of the acid treatment tank 10 including the side walls 12a and 12b on which the copper plates 13 are mounted and the side walls 12c and 12d on which the copper bars 14 are wound. ) Is immersed in the acid solution (A) and the copper plate (13) and the copper bar (14) are subjected to an acid treatment by applying an electric current to the copper plate (13) and the copper bar (14).
6. The method of claim 5,
The copper plate 13 mounted on the side walls 12a and 12b has a negative electrode and the copper bar 14 mounted on the upper ends of the other side walls 12c and 12d applies a current The method comprising the steps of:

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