CN112391636A - Acid pickling process method for medium carbon steel wire - Google Patents
Acid pickling process method for medium carbon steel wire Download PDFInfo
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- CN112391636A CN112391636A CN201910765648.0A CN201910765648A CN112391636A CN 112391636 A CN112391636 A CN 112391636A CN 201910765648 A CN201910765648 A CN 201910765648A CN 112391636 A CN112391636 A CN 112391636A
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- pickling
- carbon steel
- steel wire
- medium carbon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention relates to the technical field of wire rod pickling processes, in particular to a process method for pickling medium carbon steel wire rods, which comprises the following steps: sequentially putting medium carbon steel wire rods into a pickling tank 1-5, controlling the concentration of hydrochloric acid and ferrous chloride in the pickling tank, and controlling the pickling time to be 8-12 min; step two, controlling the temperature of pickling solution in 5 pickling tanks to be kept at 30-40 ℃ in the pickling process; step three, adding a proper amount of corrosion inhibitor into the 2 nd to 5 th pickling tanks; step four, sending the medium carbon steel wire rods from the pickling tank into a clean water washing tank for soaking, and washing off acid liquor on the surface; step five, feeding the medium carbon steel wire rods from the clean water washing tank into a washing tank to be washed by high-pressure clean water; sixthly, feeding the medium carbon steel wire subjected to high-pressure water washing into drying equipment for heating and drying; and seventhly, after the medium carbon steel wire is fully dried, returning to normal temperature, and feeding the medium carbon steel wire into wire oiling equipment for surface lubrication and coating.
Description
Technical Field
The invention relates to the technical field of wire rod pickling processes, in particular to a process method for pickling medium carbon steel wire rods.
Background
The hydrochloric acid pickling can effectively dissolve the iron scale, and simultaneously, the generated ferrous chloride is easy to dissolve in water, so the pickling reaction product remained on the surface of the wire rod is easy to clean by water. This ensures that the wire surface has a high quality when pickled in a hydrochloric acid solution, and generally, after pickling with hydrochloric acid, the wire has a clean, bright, smooth surface without spots, and thus is widely used. However, the use rate of medium carbon steel wire rods (with a carbon content of 0.50%) is higher and higher, and trace alloying elements (Mn, Cr and Si) are increased. The components in the pickling process generate certain changes in the reaction process, so that the phenomena of rough hand feeling, viscosity or greasy surface and the like can occur on the local surface of the surface quality of the pickled medium-carbon steel wire rod, and the pickling quality of the medium-carbon steel wire rod is influenced.
Disclosure of Invention
The invention aims to provide a process method for pickling medium carbon steel wires aiming at the defects of the prior art.
In order to achieve the purpose, the invention discloses a process method for pickling medium carbon steel wires, which comprises the following steps:
sequentially putting medium carbon steel wire rods into a pickling tank 1-5, and controlling the concentration of hydrochloric acid and ferrous chloride in the pickling tank;
in the pickling tank 1: the concentration of hydrochloric acid is controlled to be 40-80, and the concentration of ferrous chloride is controlled to be 150-210;
in the pickling tank 2: the concentration of hydrochloric acid is controlled to be 100-140, and the concentration of ferrous chloride is controlled to be 80-140;
in the pickling tank 3: the concentration of the hydrochloric acid is controlled to be 160-200, and the concentration of the ferrous chloride is controlled to be 10-50;
in the fourth pickling tank: the concentration of hydrochloric acid is controlled to be 200-240, and the concentration of ferrous chloride is controlled to be 5-20;
in the 5 th pickling tank: the concentration of hydrochloric acid is controlled to be less than or equal to 30, and the concentration of ferrous chloride is controlled to be less than or equal to 40;
meanwhile, the pickling time in 5 pickling tanks is controlled to be 8-12 min;
step two, controlling the temperature of pickling solution in 5 pickling tanks in the pickling process to keep the temperature of the pickling solution at 30-40 ℃;
adding a proper amount of corrosion inhibitor into the 2 nd to 5 th pickling tanks to ensure that a foam layer is generated on the surfaces of the pickling tanks;
step four, feeding the medium carbon steel wire rods from the pickling tank into a clean water washing tank for soaking, and washing off acid liquor on the surface, wherein the clean water washing tank is filled with clean water;
fifthly, the medium carbon steel wire rod is sent into a washing tank from a clear water washing tank and washed by high-pressure clear water, so that the surface of the acid-washed medium carbon steel wire rod is smooth and free of viscosity, and the water pressure is kept above 0.5 MPa;
sixthly, feeding the medium carbon steel wire subjected to high-pressure water washing into drying equipment for heating and drying;
and seventhly, after the medium carbon steel wire rod is fully dried, naturally cooling the medium carbon steel wire rod, and after the medium carbon steel wire rod is recovered to normal temperature, feeding the medium carbon steel wire rod into wire rod oiling equipment for surface lubrication and coating.
Preferably, the concentration of the corrosion inhibitor in the third step is 0.1-1%;
preferably, the drying temperature in the sixth step is set to be 40-80 ℃ until the water on the surface of the wire rod is dried, and if the air humidity is too high, the drying time can be prolonged moderately.
Preferably, the surface coating material in the seventh step is a non-metal coating, and specifically, a borax coating or a phosphate coating can be selected.
The invention has the beneficial effects that: the invention discloses a process method for pickling medium carbon steel wires, which comprises the following steps:
sequentially putting medium carbon steel wire rods into a pickling tank 1-5, and controlling the concentration of hydrochloric acid and ferrous chloride in the pickling tank;
in the pickling tank 1: the concentration of hydrochloric acid is controlled to be 40-80, and the concentration of ferrous chloride is controlled to be 150-210;
in the pickling tank 2: the concentration of hydrochloric acid is controlled to be 100-140, and the concentration of ferrous chloride is controlled to be 80-140;
in the pickling tank 3: the concentration of the hydrochloric acid is controlled to be 160-200, and the concentration of the ferrous chloride is controlled to be 10-50;
in the fourth pickling tank: the concentration of hydrochloric acid is controlled to be 200-240, and the concentration of ferrous chloride is controlled to be 5-20;
in the 5 th pickling tank: the concentration of hydrochloric acid is controlled to be less than or equal to 30, and the concentration of ferrous chloride is controlled to be less than or equal to 40;
meanwhile, the pickling time in 5 pickling tanks is controlled to be 8-12 min;
step two, controlling the temperature of pickling solution in 5 pickling tanks in the pickling process to keep the temperature of the pickling solution at 30-40 ℃;
adding a proper amount of corrosion inhibitor into the 2 nd to 5 th pickling tanks to ensure that a foam layer is generated on the surfaces of the pickling tanks;
step four, feeding the medium carbon steel wire rods from the pickling tank into a clean water washing tank for soaking, and washing off acid liquor on the surface, wherein the clean water washing tank is filled with clean water;
fifthly, the medium carbon steel wire rod is sent into a washing tank from a clear water washing tank and washed by high-pressure clear water, so that the surface of the acid-washed medium carbon steel wire rod is smooth and free of viscosity, and the water pressure is kept above 0.5 MPa;
sixthly, feeding the medium carbon steel wire subjected to high-pressure water washing into drying equipment for heating and drying;
and seventhly, after the medium carbon steel wire rod is fully dried, naturally cooling the medium carbon steel wire rod, and after the medium carbon steel wire rod is recovered to normal temperature, feeding the medium carbon steel wire rod into wire rod oiling equipment for surface lubrication and coating.
The medium carbon steel wire treated by the process method disclosed by the invention has a smooth surface and no viscosity, the surface quality is suitable for the subsequent phosphating treatment requirement, the medium carbon steel wire is subjected to comprehensive pickling, the pickling speed is increased, the pickling work can be continuously and efficiently carried out, the pickling efficiency of the metal wire is effectively improved, the pickling effect is good, the consumption of hydrochloric acid can be reduced, and the production cost of enterprises is reduced.
Detailed Description
The present invention is described in detail below.
The invention provides a process method for pickling medium carbon steel wires, which comprises the following steps:
sequentially putting medium carbon steel wire rods into a pickling tank 1-5, and controlling the concentration of hydrochloric acid and ferrous chloride in the pickling tank;
in the pickling tank 1: the concentration of hydrochloric acid is controlled to be 40-80, and the concentration of ferrous chloride is controlled to be 150-210;
in the pickling tank 2: the concentration of hydrochloric acid is controlled to be 100-140, and the concentration of ferrous chloride is controlled to be 80-140;
in the pickling tank 3: the concentration of the hydrochloric acid is controlled to be 160-200, and the concentration of the ferrous chloride is controlled to be 10-50;
in the fourth pickling tank: the concentration of hydrochloric acid is controlled to be 200-240, and the concentration of ferrous chloride is controlled to be 5-20;
in the 5 th pickling tank: the concentration of hydrochloric acid is controlled to be less than or equal to 30, and the concentration of ferrous chloride is controlled to be less than or equal to 40;
meanwhile, the pickling time in 5 pickling tanks is controlled to be 8-12 min;
step two, controlling the temperature of pickling solution in 5 pickling tanks in the pickling process to keep the temperature of the pickling solution at 30-40 ℃;
adding a proper amount of corrosion inhibitor into the 2 nd to 5 th pickling tanks to ensure that a foam layer is generated on the surfaces of the pickling tanks;
step four, feeding the medium carbon steel wire rods from the pickling tank into a clean water washing tank for soaking, and washing off acid liquor on the surface, wherein the clean water washing tank is filled with clean water;
fifthly, the medium carbon steel wire rod is sent into a washing tank from a clear water washing tank and washed by high-pressure clear water, so that the surface of the acid-washed medium carbon steel wire rod is smooth and free of viscosity, and the water pressure is kept above 0.5 MPa;
sixthly, feeding the medium carbon steel wire subjected to high-pressure water washing into drying equipment for heating and drying;
and seventhly, after the medium carbon steel wire rod is fully dried, naturally cooling the medium carbon steel wire rod, and after the medium carbon steel wire rod is recovered to normal temperature, feeding the medium carbon steel wire rod into wire rod oiling equipment for surface lubrication and coating.
In the third step of this embodiment, the concentration of the corrosion inhibitor is 0.1% -1%.
In the sixth embodiment, the drying temperature in step six is set to 40-80 ℃ until the water on the surface of the wire rod is dried, and if the air humidity is too high, the drying time can be prolonged moderately.
In the seventh step of this embodiment, the surface coating material is a non-metal coating, and specifically, a borax coating or a phosphate coating may be selected.
Influence of chemical reaction concentration
The first stage, the main reaction: FeO +2HCl FeCl2+ H2O
When the wire enters the groove, the oxide in the small holes and gaps on the scale begins to be chemically dissolved. Therefore, the capability of accelerating the movement speed of ions to enter the small holes and the gaps can be improved, and the reaction process at the stage can be improved. For strong hydrochloric acid electrolytes, the electrochemical reaction depends on the speed of ion movement. According to the summary of the Colourdo experiments: the molar conductivity of a strong electrolyte is linear with the square root of its concentration c, for which the solution concentration decreases and the molar conductivity increases. This is because as the concentration of the solution decreases, the attractive force between ions decreases, and the viscosity of the solution also decreases. The ion movement speed is increased, so the molar conductivity is increased. Thus, a suitable reduction of the concentration in the first pickling tank 1 increases the scale dissolution in the first stage.
And analyzing the second and third stages, wherein the subsequent stage of dissolving the iron scale is mainly carried out along with the wire rod. Reaction:
Fe2O3+6HCl ＝ 2FeCl3+3 H2O
Fe3O4+8HCl ＝ 2FeCl3+FeCl2+3 H2O
Fe+2HCl ＝ FeCl2+H2
FeCl3+H ＝ FeCl2+HCl
trace elements such as Mn, Cr, Si affect the solubility of the wire in acid. In order to increase the reaction of trace elements in acid, the concentration of hydrochloric acid should be theoretically increased. As the hydrochloric acid concentration increases, the acid wash rate increases, but the solubility of the iron salt in the acid decreases substantially. When the Fe content reaches a certain concentration, suspended matters on the surface of the bath solution are formed, so that the phenomenon of uneven cleaning of the surface of the wire rod is caused.
According to the analysis of the second and third stage reactions, the concentration of hydrochloric acid must be reasonably controlled between the concentrations of the 2 nd-4 th pickling tanks, so that the reaction is improved and the solubility of trace element oxides in acid is improved. The hydrochloric acid content is reduced and the ferrous chloride concentration is correspondingly increased in the line washing process, and the two influencing factors are mutually offset in the longer pickling time, so that the pickling speed is slightly changed in the time. Avoiding the surface roughness caused by the excessive aggregation of impurities and Fe salt. The test results prove that: after the wire is washed by high-pressure water, the surface of the wire is smooth in hand feeling, is not sticky, is normally washed by acid and has a good effect.
The concentration control of the acid tank of the 5 th acid washing tank is relatively low: the reason is as follows:
1. neutralizing partial residual acid, and reducing the water treatment difficulty after high-pressure water washing;
2. fe on the surface of the wire rod is increased and dissolved in the groove.
Second, hydrochloric acid temperature
Almost all chemical reactions, with increasing temperature, are accelerated. However, the hydrochloric acid has stronger volatility, the volatilized HCl gas has larger damage effect on people, metal, equipment and buildings, and when the content of the HCl gas in the air reaches 1 multiplied by 10^ -6, some metals can be darkened by corrosion. Therefore, the acid washing reaction rate cannot be increased by heating hydrochloric acid. Reasonable temperature control can ensure the reaction speed under the condition of high hydrochloric acid content and ensure the solubility of ferrous chloride. The reaction time is reduced, and the frequent adjustment of hydrochloric acid due to the excessive aggregation of Fe in the line washing process is reduced, so that the cost is reduced, and the production operation rate is increased.
Third, the influence of corrosion inhibitor
After the iron scale passes through the first stage, hydrochloric acid permeates into the bottom of the iron scale from small holes and gaps to perform redox reaction with Fe, when the concentration of Fe2+ and Fe3+ is high, the dissolution speed is high, but the electrochemical reaction is slowed down due to corrosion salt deposition in the small holes and the gaps, the wire cannot be untied due to pickling equipment, and the wire enters an acid tank in a bundled state to cause a large amount of iron salt to be deposited on the surface of the wire. The wire has particularity, is easy to adsorb ferric salt in a tank, causes poor finish degree of the surface of the wire after high-pressure water washing, is gray black, and is added with a corrosion inhibitor according to the wire washing amount and the corrosion degree of the surface of the wire through a production practice test, so that a foam layer is ensured to be generated on the surface of an acid tank, the surface tension of pickling solution is reduced, the wetting effect of the pickling wire is improved, a pickling reaction product is promoted to be separated from the metal surface, the surface is pickled uniformly and rapidly, the influence of the ferric salt on the surface of the wire is reduced, and the finish degree of the metal surface is ensured to be.
The medium carbon steel wire treated by the process method disclosed by the invention has a smooth surface and no viscosity, the surface quality is suitable for the subsequent phosphating treatment requirement, the medium carbon steel wire is subjected to comprehensive pickling, the pickling speed is increased, the pickling work can be continuously and efficiently carried out, the pickling efficiency of the metal wire is effectively improved, the pickling effect is good, the consumption of hydrochloric acid can be reduced, and the production cost of enterprises is reduced.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (4)
1. A process method for pickling medium carbon steel wires is characterized by comprising the following steps: the method comprises the following steps:
sequentially putting medium carbon steel wire rods into a pickling tank 1-5, and controlling the concentration of hydrochloric acid and ferrous chloride in the pickling tank;
in the pickling tank 1: the concentration of hydrochloric acid is controlled to be 40-80, and the concentration of ferrous chloride is controlled to be 150-210;
in the pickling tank 2: the concentration of hydrochloric acid is controlled to be 100-140, and the concentration of ferrous chloride is controlled to be 80-140;
in the pickling tank 3: the concentration of the hydrochloric acid is controlled to be 160-200, and the concentration of the ferrous chloride is controlled to be 10-50;
in the fourth pickling tank: the concentration of hydrochloric acid is controlled to be 200-240, and the concentration of ferrous chloride is controlled to be 5-20;
in the 5 th pickling tank: the concentration of hydrochloric acid is controlled to be less than or equal to 30, and the concentration of ferrous chloride is controlled to be less than or equal to 40;
meanwhile, the pickling time in 5 pickling tanks is controlled to be 8-12 min;
step two, controlling the temperature of pickling solution in 5 pickling tanks in the pickling process to keep the temperature of the pickling solution at 30-40 ℃;
adding a proper amount of corrosion inhibitor into the 2 nd to 5 th pickling tanks to ensure that a foam layer is generated on the surfaces of the pickling tanks;
step four, feeding the medium carbon steel wire rods from the pickling tank into a clean water washing tank for soaking, and washing off acid liquor on the surface, wherein the clean water washing tank is filled with clean water;
fifthly, the medium carbon steel wire rod is sent into a washing tank from a clear water washing tank and washed by high-pressure clear water, so that the surface of the acid-washed medium carbon steel wire rod is smooth and free of viscosity, and the water pressure is kept above 0.5 MPa;
sixthly, feeding the medium carbon steel wire subjected to high-pressure water washing into drying equipment for heating and drying;
and seventhly, after the medium carbon steel wire rod is fully dried, naturally cooling the medium carbon steel wire rod, and after the medium carbon steel wire rod is recovered to normal temperature, feeding the medium carbon steel wire rod into wire rod oiling equipment for surface lubrication and coating.
2. The process method for pickling medium carbon steel wire rods according to claim 1, characterized by comprising the following steps: the concentration of the corrosion inhibitor in the third step is 0.1-1%.
3. The process method for pickling medium carbon steel wire rods according to claim 1, characterized by comprising the following steps: and setting the drying temperature in the sixth step to be 40-80 ℃ until the water on the surface of the wire rod is dried, wherein if the air humidity is too high, the drying time can be prolonged moderately.
4. The process method for pickling medium carbon steel wire rods according to claim 1, characterized by comprising the following steps: and the surface coating material in the seventh step is a non-metal coating, and specifically a borax coating or a phosphate coating can be selected.
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| CN201910765648.0A CN112391636A (en) | 2019-08-19 | 2019-08-19 | Acid pickling process method for medium carbon steel wire |
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| CN201910765648.0A CN112391636A (en) | 2019-08-19 | 2019-08-19 | Acid pickling process method for medium carbon steel wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114106595A (en) * | 2021-11-08 | 2022-03-01 | 凯明(常州)新材料科技有限公司 | Surface treatment method for steel wire for needle roller bearing |
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2019
- 2019-08-19 CN CN201910765648.0A patent/CN112391636A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114106595A (en) * | 2021-11-08 | 2022-03-01 | 凯明(常州)新材料科技有限公司 | Surface treatment method for steel wire for needle roller bearing |
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Application publication date: 20210223 |
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