阅读说明：本技术 一种盘条钢丝酸洗装置及其酸洗控制方法 (Wire rod steel wire pickling device and pickling control method thereof ) 是由 孟辉 于 2021-10-08 设计创作，主要内容包括：本发明公开了一种盘条钢丝酸洗装置,包括槽体、超声清洗阵列和惰性电极阵列,超声清洗阵列、惰性电极阵列间隔设置在槽体的相对面内侧,槽体内设置用于清洗盘条钢丝的酸洗液,惰性电极阵列为阴极,盘条钢丝为阳极,阴极上溢出气泡。本发明还公开了一种盘条钢丝的酸洗控制方法,将盘条钢丝放入盐酸质量分数为10％～15％的酸洗液里,通入低压直流周期性电源；使用超声清洗阵列对盘条钢丝进行轰击；用高压水冲洗盘条钢丝,得到表面粗糙度为Ra0.8～1.6μm的盘条钢丝。本发明能够延长酸洗槽液的使用寿命,避免吸氢腐蚀,钢丝盘条表面质量可控,能够减少酸的使用和挥发；能够降低反应剧烈程度,盘条钢丝表面粗糙度及粗糙度差异比较小。(The invention discloses a wire rod steel wire pickling device which comprises a tank body, an ultrasonic cleaning array and an inert electrode array, wherein the ultrasonic cleaning array and the inert electrode array are arranged on the inner side of the opposite surface of the tank body at intervals, pickling solution for cleaning a wire rod steel wire is arranged in the tank body, the inert electrode array is a cathode, the wire rod steel wire is an anode, and bubbles overflow from the cathode. The invention also discloses a pickling control method of the steel wire rod, which comprises the steps of putting the steel wire rod into pickling solution with the mass fraction of hydrochloric acid of 10-15%, and introducing a low-voltage direct-current periodic power supply; bombarding the wire rod steel wire by using an ultrasonic cleaning array; and (3) washing the steel wire rod with high-pressure water to obtain the steel wire rod with the surface roughness of Ra0.8-1.6 mu m. The invention can prolong the service life of the pickling bath solution, avoid hydrogen absorption corrosion, control the surface quality of the steel wire rod and reduce the use and volatilization of acid; the reaction intensity can be reduced, and the surface roughness and roughness difference of the steel wire rod are small.)

1. A wire rod pickling device is characterized in that: including cell body (1), ultrasonic cleaning array (2) and inert electrode array (3), ultrasonic cleaning array (2), inert electrode array (3) interval set up at the opposite face of cell body (1) inboardly, set up the pickle that is used for wasing wire rod steel wire (4) in cell body (1), inert electrode array (3) are the negative pole, wire rod steel wire (4) are the positive pole, the excessive bubble of negative pole.

2. The pickling device for the coiled steel wire according to claim 1, characterized in that: the inert electrode array (3) comprises a plurality of inert electrode plates (31) which are parallel to each other, the inclination angle of each inert electrode plate (31) is 30-45 degrees, the length is 1.2-2.0 meters, the width is 0.1-0.15 meters, and the height is the same as that of the wire rod steel wire (4).

3. The pickling device for the coiled steel wire according to claim 2, characterized in that: the inert electrode plate (31) is made of a lead plate, and the surface of the inert electrode plate is coated with an yttrium oxide coating.

4. The pickling device for the coiled steel wire according to claim 1, characterized in that: the length of the inert electrode array (3) is less than half of the length of the tank body.

5. The pickling device for the coiled steel wire according to claim 1, characterized in that: and inert electrode arrays (3) are arranged on the opposite surface and the adjacent positions of the ultrasonic cleaning array (2).

6. The pickling device for the coiled steel wire according to claim 1, characterized in that: the ultrasonic cleaning array (2) comprises a plurality of uniformly distributed monomer circular ultrasonic generators (21), and the interval of the monomer circular ultrasonic generators (21) is larger than the diameter of the monomer circular ultrasonic generators.

7. The pickling device for the wire rod of claim 1, wherein the pickling solution comprises the following substances in percentage by mass: 10 to 15 percent of hydrochloric acid and 5 to 12.5 percent of FeCl₂。

8. The pickling control method of the steel wire rod is characterized by comprising the following steps:

(a) putting the steel wire rod (4) into a pickling solution with hydrochloric acid of 10-15% by mass, and introducing a low-voltage direct-current periodic power supply to enable an electrode connected with the steel wire rod (4) to serve as an anode and an inert electrode array (3) to serve as a cathode;

(b) bombarding the wire rod steel wire (4) by using the ultrasonic cleaning array (2) to accelerate the falling of an oxide skin of the wire rod steel wire (4);

(c) and (3) cutting off the power and washing the wire rod steel wire (4) by using high-pressure water to obtain the wire rod steel wire (4) with the surface roughness of Ra0.8-1.6 mu m.

9. The pickling control method of the steel wire rod according to claim 8, wherein the pickling control method comprises the following steps: the low-voltage direct-current periodic power supply has the use voltage of 20-30V and the current density of 4-8A/dm²。

10. The pickling control method of the steel wire rod according to claim 8, wherein the pickling control method comprises the following steps: the frequency of the ultrasonic cleaning array (2) is 20-30 kHz, and the power density is 0.5-1.0W/cm²。

Technical Field

The invention relates to a pickling device and a control method, in particular to a wire rod steel wire pickling device and a pickling control method thereof.

Background

Most of the existing pickling devices directly pickle by acid liquor. The Chinese patent with the application number of 201710204068.5 discloses an on-line steel pipe surface rust removal process, which directly conveys a steel pipe to be subjected to rust removal into an on-line pickling tank, the steel pipe is subjected to on-line pickling through a pickling solution under the guidance of a steel pipe pressing down guide roller, and the steel pipe is subjected to direct current electrolysis while passing through the pickling solution so as to generate a large amount of bubbles on the surface of the steel pipe and finally to be subjected to alkali neutralization. However, it is not suitable for pickling treatment of large articles such as wire rod and steel wire, and bubbles are generated on the surface of the material to be pickled, and when the metal and the acid solution generate chemical reaction, hydrogen atoms enter the crystal interior along the crystal grain boundary of the metal under specific conditions and are gathered at the position with internal defects or directly at the crystal grain boundary, which can cause the metal to fail prematurely under the mechanical processing or service conditions.

The traditional disk pickling mainly adopts a soaking method, and mainly uses hydrochloric acid with high concentration and mass fraction of more than 25 percent and is mixed with a sustained release agent with a certain proportion; meanwhile, a large amount of hydrogen bubbles are directly produced on the surface of the wire rod, so that the risk of hydrogen embrittlement cannot be eliminated. In addition, because of the different carbon contents of the disc metal materials, the pickling time of the low-carbon steel is longer, and the high-carbon steel (such as bearing steel) can also generate a relatively violent reaction even in a solution prepared in a standard way, so that the risk of over-pickling exists. The traditional pickling process is a chemical contact reaction, and the state difference of each contact part is large, so that some parts are over-corroded to form surface pits, and the surface roughness of the wire rod is large.

When the concentration of the ferrous ions in the solution reaches a certain value, the tank is changed even if the concentration of the hydrogen ions in the solution is high, and the concentration of the acid in the solution is still higher than 10%, so that waste is not caused. For climatic reasons, it is often necessary to maintain the bath solution at a temperature to maintain the bath solution active in the winter, and to increase the temperature due to exothermic reactions in the summer to volatilize acid mist. These safety, environmental and quality issues have always been a significant problem limiting the steel wire product manufacturing enterprises.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide the wire rod steel wire pickling device which reduces the groove changing frequency and has good pickling effect, and the invention also aims to provide the pickling control method of the wire rod steel wire with completely controllable surface quality roughness interval indexes.

The technical scheme is as follows: the invention relates to a wire rod steel wire pickling device which comprises a tank body, an ultrasonic cleaning array and an inert electrode array, wherein the ultrasonic cleaning array and the inert electrode array are arranged on the inner sides of opposite surfaces of the tank body at intervals, pickling solution for cleaning a wire rod steel wire is arranged in the tank body, the inert electrode array is a cathode, the wire rod steel wire is an anode, and bubbles overflow from the cathode.

Furthermore, the inert electrode array comprises a plurality of inert electrode plates which are parallel to each other, the inclination angle of each inert electrode plate is 30-45 degrees, the gathering time of micro bubbles on the electrode plates is longest, and when the bubbles formed after the micro bubbles are separated from the electrode plates are the largest, the buoyancy of the gathered bubbles is larger and the bubbles are easier to discharge; the length is 1.2-2.0 m, the width is 0.1-0.15 m, and the height is the same as the height of the wire rod steel wire. The inert electrode plate is made of a lead plate, and the surface of the inert electrode plate is coated with an yttrium oxide coating. The length of the inert electrode array is less than half of the length of the groove body.

Furthermore, inert electrode arrays are arranged on the opposite surface and the adjacent positions of the ultrasonic cleaning array. The ultrasonic cleaning array comprises a plurality of monomer circular ultrasonic generators which are uniformly distributed, the interval of the monomer circular ultrasonic generators is larger than the diameter of the monomer ultrasonic generators, the uniformity of the ultrasonic energy density is ensured, and the energy loss caused by the mutual interference of too close distances can be prevented.

Further, the pickling solution comprises the following substances in percentage by mass: 10 to 15 percent of hydrochloric acid and 5 to 12.5 percent of FeCl₂. The problem of volatilization is solved by directly reducing the initial concentration of the hydrochloric acid solution; the original reaction intensity can be reduced, and the chemical reaction can be accelerated in the acid liquor environment with lower concentration by the form of external connection of a direct current power supply. FeCl₂The upper limit of solubility in the solution at 40 ℃ is about 150 g, and the solution just reaches a saturated state, so that the concentration of the solution needs to be reduced in a tank changing manner. If the chemical reaction is in equilibrium without the input of external energy, the solution can no longer react with the metal disk. Through the form of external DC power supply, there is electron input constantly, can continue to promote again that chemical reaction goes on to the right, simultaneously, because solution supersaturation then can have crystal to precipitate out, otherwise under the same temperature condition then can not be from the supersaturation state to unsaturated state.

A pickling control method of a steel wire rod comprises the following steps:

(a) putting the steel wire rod into a pickling solution with hydrochloric acid of 10-15% by mass, and introducing a low-voltage direct-current periodic power supply to enable an electrode connected with the steel wire rod to serve as an anode and an inert electrode array to serve as a cathode;

(b) bombarding the steel wire rod by using an ultrasonic cleaning array to accelerate the falling of the oxide skin of the steel wire rod;

(c) and (3) cutting off the power and washing the steel wire rod by using high-pressure water to obtain the steel wire rod with the surface roughness of Ra0.8-1.6 mu m.

Furthermore, the low-voltage DC periodic power supply has the use voltage of 20-30V and the current density of 4-8A/dm². The main reason for generating the hydrogen embrittlement risk of the steel wire is that the metal matrix is in contact with an acid washing solution for electrochemical reaction, iron atoms lose electrons, the electrons are transferred inwards in disorder through metal under the condition of no external voltage, free electrons are provided nearby the metal atoms losing the electrons, the free electrons are obtained on the surface of the metal matrix to generate hydrogen molecules, and the hydrogen molecules are accumulated to a certain amount and then directly generate micro bubbles to overflow outwards; since the hydrogen molecules are particularly small in this process, it diffuses not only to the outside of the metal matrix but also to the inside of the metal matrix, and accumulates at the grain boundaries and internal tissue defects, the more violent the reaction, the greater the risk of diffusion into the metal matrix, which is likely to cause "hydrogen embrittlement". According to the method, an electrolytic structure is formed by connecting the steel wire with the low-voltage direct-current power supply externally, so that most of hydrogen ions in the solution can directly obtain electrons on the surface of the cathode inert electrode to form hydrogen molecules, and the main reaction at the end of the metal matrix only leaves the process that metal atoms lose the electrons to form ions and the ions are dissolved into the solution, so that the participation degree of the hydrogen atoms diffusing into the metal matrix is very low, and the risk of hydrogen embrittlement is obviously reduced.

Furthermore, the frequency of the ultrasonic cleaning array is 20-30 kHz, and the power density is 0.5-1.0W/cm². High-energy bubble stripping disc for wire rod steel wire surface through ultrasonic wavesThe oxide skin on the round surface enables the whole processing period to be more energy-saving and more efficient.

The control principle is as follows: the PLC is used for controlling, when the material hook is in place, the limiting sensor is triggered, the device sends an in-place signal to the processor, and the processor sends an instruction to enable the power supply timer and the ultrasonic timer to work and respectively start or stop according to set time.

Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:

1. the service life of the pickling bath solution can be prolonged, the risk of hydrogen absorption corrosion is effectively avoided, the surface quality of the steel wire rod is controllable, and the use of acid and the volatilization of acid mist can be reduced;

2. the chemical reaction strength is reduced by the low-concentration acid liquor, the volatilization problem is solved, the original reaction intensity can be reduced, the risk of over-corrosion is relatively small, and the current density of the wire rod steel wire subjected to direct current is relatively uniform, so the surface roughness and roughness difference are relatively small;

3. the high-energy bubbles are used for stripping oxide skins on the surfaces of the wire rods and the steel wires through ultrasonic waves, so that the whole processing period is more energy-saving and more efficient;

4. the chemical reaction can be accelerated in a lower-concentration acid liquid environment through the form of an external direct-current power supply, an electrolytic structure is formed, most of hydrogen ions in the solution directly obtain electrons on the surface of a cathode inert electrode to form hydrogen molecules, the participation degree of hydrogen atoms diffused into the metal matrix is very low, and the risk of hydrogen embrittlement is remarkably reduced.

Drawings

FIG. 1 is a top view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic diagram of the structure of an inert electrode array of the present invention;

FIG. 4 is a schematic diagram of the structure of an ultrasound array of the present invention.

Detailed Description

As shown in figures 1-2, the pickling device comprises a tank body 1, and symmetrical ultrasonic cleaning arrays 2 are respectively arranged on the inner sides of opposite surfaces of the tank body 1The inert electrode array 3 is arranged at the most adjacent position of the ultrasonic cleaning array 2. The inside of the tank body 1 is provided with a pickling solution for cleaning the wire rod steel wire 4, and the pickling solution comprises 10-15 wt% of hydrochloric acid and 5-12.5 wt% of FeCl₂. The inert electrode array 3 is a cathode, the wire rod steel wire 4 is an anode, and bubbles overflow from the cathode.

Referring to fig. 3, the inert electrode array 3 includes a plurality of inert electrode plates 31 parallel to each other, each inert electrode plate 31 has an inclination angle of 30 to 45 °, a length of 1.2 to 2.0 m, a width of 0.1 to 0.15 m, and a height equal to the height of the wire rod 4. The inert electrode plate 31 is made of lead plate and is coated with yttrium oxide coating on the surface. The length of the inert electrode array 3 is less than half of the length of the tank body 1.

As shown in fig. 4, the ultrasonic cleaning array 2 comprises a plurality of uniformly distributed monomer circular ultrasonic generators 21, and the interval between the monomer circular ultrasonic generators 21 is larger than the diameter of the monomer ultrasonic generators.

Example 1

a. Scattering a steel wire rod 4 (made of SWRCH 6A material), uniformly paving the steel wire rod on a material hook 5, binding anodes of a direct current power supply at two ends of the polished steel wire rod 4, making electrodes connected with the steel wire rod 4 as anodes, and making an inert electrode array 3 as a cathode;

b. the steel wire rod 4 is put into the pickling solution with the hydrochloric acid mass fraction of 15wt percent by means of equipment procedures, the temperature is 0 ℃, and FeCl is added₂The mass percent of the high-voltage direct current is 12.5 wt%, a low-voltage direct current periodic power supply is introduced, the access voltage is 30V, and the current density is 8A/dm²Ultrasonic frequency of 30KHz and power density of 1.0W/cm²Bombarding the wire rod steel wire 4 by using the ultrasonic cleaning array 2 to accelerate the falling of an oxide skin of the wire rod steel wire 4, wherein the directions of an ultrasonic device and a power supply current are shown in the following table 1;

c. after the procedure was completed, the power was turned off and the wire rod 4 was rinsed with high-pressure water to obtain a wire rod 4 having a surface roughness Ra of 1.6 μm.

TABLE 1 ultrasonic turn-on and Power supply Current Direction

Soaking time period/minute

1

1

1

1

1

1

Voltage clamp (anode plate circle is positive)

Is just

Is just

Is just

Is just

Is just

Is just

Ultrasonic on condition

Closing device

Opening device

Opening device

Closing device

Opening device

Closing device

Example 2

TABLE 2 ultrasonic turn-on and Power supply Current Direction

Soaking time period/minute

1

1

1

1

1

1

Voltage clamp (anode plate circle is positive)

Is just

Is just

Is just

Is just

Is just

Is just

Ultrasonic on condition

Closing device

Opening device

Opening device

Closing device

Opening device

Closing device

a. Scattering a wire rod steel wire 4 (made of SWRCH 35K material), uniformly paving the wire rod steel wire on a material hook 5, binding anodes of a direct current power supply at two ends of the polished wire rod steel wire 4, enabling an electrode connected with the wire rod steel wire 4 to be used as an anode, and enabling an inert electrode array 3 to be used as a cathode;

b. the steel wire rod 4 is put into the pickling solution with the hydrochloric acid mass fraction of 13wt percent by means of equipment procedures, and FeCl is added₂The mass percent of the high-voltage direct current is 5 wt%, a low-voltage direct current periodic power supply is introduced, the access voltage is 25V, and the current density is 6A/dm²Ultrasonic frequency of 25KHz and power density of 0.9W/cm²Bombarding the wire rod steel wire 4 by using the ultrasonic cleaning array 2 to accelerate the falling of an oxide skin of the wire rod steel wire 4, wherein the directions of an ultrasonic device and a power supply current are shown in the table 2;

c. after the procedure was completed, the power was turned off and the wire rod 4 was rinsed with high-pressure water to obtain a wire rod 4 having a surface roughness Ra of 1.2 μm.

Example 3

a. Scattering a wire rod steel wire 4 (made of SCM435 material), uniformly paving the wire rod steel wire on a material hook 5, binding anodes of a direct current power supply at two ends of the polished wire rod steel wire 4, making an electrode connected with the wire rod steel wire 4 as an anode and an inert electrode array 3 as a cathode;

b. the steel wire rod 4 is put into the pickling solution with the hydrochloric acid mass fraction of 10 wt% by means of equipment procedures, the temperature is 20 ℃, the temperature is 10 ℃, and FeCl is added₂The mass percent of the high-voltage direct current is 10.0 wt%, a low-voltage direct current periodic power supply is introduced, the access voltage is 20V, and the current density is 4A/dm²Ultrasonic frequency of 23KHz and power density of 0.6W/cm²Bombarding the wire rod steel wire 4 by using the ultrasonic cleaning array 2 to accelerate the falling of an oxide skin of the wire rod steel wire 4, wherein the directions of an ultrasonic device and a power supply current are shown in a table 3;

c. after the procedure was completed, the power was turned off and the wire rod 4 was rinsed with high-pressure water to obtain a wire rod 4 having a surface roughness Ra of 1.0 μm.

TABLE 3 ultrasonic turn-on and Power supply Current Direction

Soaking time period/minute

1

1

1

1

1

1

Voltage clamp (anode plate circle is positive)

Is just

Is just

Is just

Is just

Is just

Is just

Ultrasonic on condition

Closing device

Opening device

Opening device

Closing device

Opening device

Closing device

Example 4

TABLE 4 ultrasonic turn-on and Power supply Current Direction

Soaking time period/minute

1

1

1

1

1

1

Voltage clamp (anode plate circle is positive)

Is just

Is just

Negative pole

Is just

Negative pole

Is just

Ultrasonic on condition

Closing device

Opening device

Opening device

Closing device

Opening device

Closing device

a. Scattering the wire rod steel wires 4 (made of GCr15 material), uniformly spreading the wire rod steel wires on the material hooks 5, binding anodes of a direct current power supply at two ends of the polished wire rod steel wires 4, making electrodes connected with the wire rod steel wires 4 as anodes, and making the inert electrode array 3 as a cathode;

b. the wire rod 4 is thrown in by means of a plant programThe hydrochloric acid mass fraction is 12 wt%, the temperature is 30 ℃, and FeCl is added into the pickling solution₂The mass percent of the high-voltage direct current is 7.0 wt%, a low-voltage direct current periodic power supply is introduced, the access voltage is 22V, and the current density is 5A/dm²Ultrasonic frequency of 20KHz and power density of 0.7W/cm²Bombarding the wire rod steel wire 4 by using the ultrasonic cleaning array 2 to accelerate the falling of an oxide skin of the wire rod steel wire 4, wherein the directions of an ultrasonic device and a power supply current are shown in the table 4;

c. after the procedure was completed, the power was turned off and the wire rod 4 was rinsed with high-pressure water to obtain a wire rod 4 having a surface roughness Ra of 0.8 μm.

Example 5

a. Scattering the wire rod steel wires 4 (made of GCr15 material), uniformly spreading the wire rod steel wires on the material hooks 5, binding anodes of a direct current power supply at two ends of the polished wire rod steel wires 4, making electrodes connected with the wire rod steel wires 4 as anodes, and making the inert electrode array 3 as a cathode;

b. the steel wire rod 4 is put into the pickling solution with the hydrochloric acid mass fraction of 15wt percent by means of equipment procedures, the temperature is 0 ℃, and FeCl is added₂The mass percent of the high-voltage direct current is 11.5 wt%, a low-voltage direct current periodic power supply is introduced, the access voltage is 28V, and the current density is 7A/dm²Ultrasonic frequency of 27KHz and power density of 0.5W/cm²Bombarding the wire rod steel wire 4 by using the ultrasonic cleaning array 2 to accelerate the falling of an oxide skin of the wire rod steel wire 4, wherein the directions of an ultrasonic device and a power supply current are shown in a table 5;

c. after the procedure was completed, the power was turned off and the wire rod 4 was rinsed with high-pressure water to obtain a wire rod 4 having a surface roughness Ra of 1.0 μm.

TABLE 5 ultrasonic turn-on and Power supply Current Direction

Soaking time period/minute

1

1

1

1

1

1

Voltage clamp (anode plate circle is positive)

Is just

Is just

Negative pole

Is just

Negative pole

Is just

Ultrasonic on condition

Closing device

Opening device

Opening device

Closing device

Opening device

Closing device