CN107413771A - A kind of casting skin coil of strip derusting process - Google Patents

A kind of casting skin coil of strip derusting process Download PDF

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Publication number
CN107413771A
CN107413771A CN201710041362.9A CN201710041362A CN107413771A CN 107413771 A CN107413771 A CN 107413771A CN 201710041362 A CN201710041362 A CN 201710041362A CN 107413771 A CN107413771 A CN 107413771A
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CN
China
Prior art keywords
steel band
scale
steel
strip
roller
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CN201710041362.9A
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Chinese (zh)
Inventor
朱继乔
胡军
朱国荣
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Fujian Wang Wang Industrial Co Ltd
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Fujian Wang Wang Industrial Co Ltd
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Priority to CN201710041362.9A priority Critical patent/CN107413771A/en
Publication of CN107413771A publication Critical patent/CN107413771A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/04—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by a combination of operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/50—Treatment of iron or alloys based thereon
    • 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
    • C23G1/085—Iron or steel solutions containing HNO3
    • 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
    • C23G1/086—Iron or steel solutions containing HF
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C25F1/02—Pickling; Descaling
    • C25F1/04—Pickling; Descaling in solution
    • C25F1/06—Iron or steel

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The present invention provides a kind of casting skin coil of strip derusting process, comprises the following steps：Casting skin coil of strip is broken into phosphorus machine by four stations and carries out brokenly phosphorus derusting, steel band passes through two roller groups, operated simultaneously by upper roller and lower roller and cause steel band bending, improve the elongation of steel band, increase the otherness to extend between scale and mother metal, so as to increase the crack openings degree of steel strip surface scale, while eliminate the side wave of steel band；Again by two aligning roller groups, operated simultaneously by upper straightening roll and lower smoothing roll and eliminate the C of steel band and stick up and stuck up with L；The scale of skin breakage will be removed by the way of grinding is scrubbed via the steel band after the broken phosphorus machine derusting in four stations；Steel band after grinding is scrubbed is removed to the scale of steel strip surface using electrolysis mode, the scale of steel strip surface changes into Cr (OH) during electrolysis3With Fe (OH)3Precipitation is removed, caused O in electrolytic process2And H2The scale of steel strip surface is peeled off.The casting skin coil of strip derusting process of the present invention enhances the derusting ability of whole technological process, improves production efficiency.

Description

A kind of casting skin coil of strip derusting process
Technical field
The present invention relates to the manufacture field of stainless steel, more particularly to the derusting process of casting skin coil of strip.
Background technology
The derusting process flow of traditional casting skin coil of strip is as follows：
Casting skin coil of strip breaks phosphorus machine → sand-blasting machine → sulfuric acid washing → nitration mixture pickling by the station of annealing furnace → tri-
Because scale is thick, hardly possible removes casting skin coil of strip, so the mode of derusting typically uses mechanical derusting and chemical derusting knot The mode of conjunction is carried out.However, traditional casting skin coil of strip derusting process using sand-blasting machine carry out mechanical derusting when, due to sand-blasting machine Steel ball impact steel strip surface form intensive pit it is right so that the surface roughness (Ra) of steel band increases to 3.0-4.0 The quality of follow-up cold-rolled products can have undesirable effect；After steel band even is carried out into mill mirror board, the surface of steel band still may be used See the spot defect that sandblasting leaves, cause the usable scope for reducing cold-rolled products.In addition, during sulfuric acid washing, due to The degree that the position of position and crack where scale chemically reacts has differences, and causes the color and luster after steel strip surface pickling It is uneven with roughness, so as to influence the direct use range of product, and reduce the quality standard of follow-up cold rolling final products.
The content of the invention
The present invention provides a kind of effectively quickening and removes casting skin coil of strip surface scale, improves production efficiency, while improve product The casting skin coil of strip derusting process of quality.
The technical solution adopted by the present invention is：A kind of casting skin coil of strip derusting process, comprises the following steps：
Casting skin coil of strip is broken into phosphorus machine by four stations and carries out brokenly phosphorus derusting；Wherein, phosphorus machine is broken at four stations includes the first tension force successively Roller, two roller groups, two aligning roller groups and the second jockey pulley；Each roller group includes upper roller and lower roller, upper roller it is straight Footpath is equal to the diameter of lower roller, and each aligning roller group includes upper straightening roll and lower smoothing roll, and the diameter of upper straightening roll is more than or small In the diameter of lower smoothing roll；Casting skin coil of strip first passes around the first jockey pulley so that casting skin coil of strip is spread apart in the form of steel band, so Steel band is operated by two roller groups and causes steel band bending, improved the elongation of steel band, increased simultaneously by upper roller and lower roller afterwards The otherness to extend between scale and mother metal, so as to increase the crack openings degree of steel strip surface scale, while eliminate the side of steel band Wave；Again by two aligning roller groups, operated simultaneously by upper straightening roll and lower smoothing roll and eliminate the C of steel band and stick up and stuck up with L；Finally by second Jockey pulley is delivered to next process；
The scale of skin breakage will be removed by the way of grinding is scrubbed via the steel band that the second jockey pulley conveys；Grinding In the presence of remove steel strip surface grease, while cause steel strip surface scale tissue looseness；
Steel band after grinding is scrubbed is removed to the scale of steel strip surface using electrolysis mode；Wherein, electrolyte uses NaSO4Solution, the scale of steel strip surface changes into Cr (OH) during electrolysis3With Fe (OH)3Precipitation is removed, and is produced in electrolytic process Raw O2And H2The scale of steel strip surface is peeled off；Wherein, steel band is first used as anode during electrolysis, is re-used as negative electrode, alternately changes, Chemical reaction is as follows：
Anode reaction:
Cr2O3+5H2O→2CrO4 2-+10H++6e-----(1)
Cr2O3+4H2O→Cr2O7 2-+8H++6e-----(2)
Fe2O3→2Fe3++3/2O2↑+6e-----(3)
H2O→1/2O2↑+2H++2e-----(4)
Cathode reaction:
CrO4 2-+4H2O+3e-→Cr(OH)3↓+5OH-----(5)
Cr2O7 2-+7H2O+6e-→2Cr(OH)3↓+8OH-----(6)
Fe3++3OH-→Fe(OH)3↓----(7)
2H2O+2e-→H2↑+2OH-----(8)
Further, the steel band after electrolysis is subjected to nitration mixture pickling；Wherein, mixed acid solution is HF and HNO3Mixing Solution.
Further, the current density of electrolysis is 4~6C/dm2。
Further, the concentration of electrolyte is 15%~25%.
Further, the temperature of electrolysis is 70~80 DEG C.
Further, nitration mixture pickling is divided into two sections, and first paragraph removes the remaining scale of steel strip surface using HF, and second segment is adopted Use HNO3Reacted with steel band, pass through HNO3Passivating film is formed in steel strip surface so that steel band with the nitrogen oxides of steel band reaction generation There is metallic luster on surface.
Compared to prior art, casting skin coil of strip derusting process of the invention, phosphorus machine is broken to casting skin coil of strip by using four stations Phosphorus derusting is broken in air inlet so that the crack openings degree of steel strip surface scale increases, and enhances the effect of scale peeling, follow-up to improve Electrolytic derusting and the efficiency of nitration mixture pickling provide good surface condition, so as to enhance the derusting of whole technological process Ability, improve production efficiency.Compared to traditional casting skin coil of strip derusting process, avoid being derusted using sand-blasting machine, so as to subtract The roughness of small steel strip surface, laid the foundation to improve the quality of final cold rolling product, expand the use range of product.
Brief description of the drawings
Accompanying drawing be for providing a further understanding of the present invention, and a part for constitution instruction, it is and following specific Embodiment is used to explain the present invention together, but should not be construed as limiting the invention.In the accompanying drawings,
Fig. 1：Casting skin coil of strip derusting process flow chart of the present invention；
Fig. 2：Break the schematic diagram of phosphorus machine in four stations of the invention；
Fig. 3：The schematic diagram of roller group of the present invention；
Fig. 4：The schematic diagram of present invention aligning roller group；
Fig. 5：The schematic diagram that concentration of electrolyte of the present invention influences on electrolytic efficiency；
Fig. 6：The schematic diagram that current density of the present invention influences on electrolytic efficiency；
Fig. 7：The schematic diagram that electrolysis temperature of the present invention influences on electrolytic efficiency.
Each component names and its label
First jockey pulley 1 Roller group 2 Upper roller 20 Lower roller 21
Align roller group 3 Upper straightening roll 30 Lower smoothing roll 31 Second jockey pulley 4
Working position A, B
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Please Fig. 1 and Fig. 2, casting skin coil of strip derusting process of the invention comprises the following steps：
First, casting skin coil of strip is broken into phosphorus machine by four stations and carries out brokenly phosphorus derusting；Wherein, phosphorus machine is broken at four stations includes first successively Jockey pulley 1, two roller groups 2, the two aligning jockey pulley 4 of roller group 3 and second；Each roller group 2 includes upper roller 20 and lower roller 21, the diameter of upper roller 20 is equal to the diameter of lower roller 21, and each aligning roller group 3 includes upper straightening roll 30 and lower smoothing roll 31, The diameter of upper straightening roll 30 is more than or less than the diameter of lower smoothing roll 31；Casting skin coil of strip first passes around the first jockey pulley 1 so that black Skin coil of strip is spread apart in the form of steel band, and then by two roller groups 2, operated simultaneously by upper roller 20 and lower roller 21 makes steel band Steel band bending (the working position A in reference picture 2) is obtained, improves the elongation of steel band, increases the difference to extend between scale and mother metal Property, so as to increase the crack openings degree of steel strip surface scale, while eliminate the side wave of steel band；Again by two aligning roller groups 3, by upper Smoothing roll 30 and lower smoothing roll 31 operate simultaneously to be eliminated the C of steel band and sticks up and stuck up (the working position B in reference picture 2) with L；Finally by second Jockey pulley 4 is delivered to next process.
Fig. 3 is refer to, because the diameter of upper roller 20 is equal to the diameter of lower roller 21, when steel band passes through two roller groups 2, Roller 20 and lower roller 21 are identical with the contact area and dynamics on the upper and lower surface of steel band on each group, enable to steel band curved The side wave of steel band is eliminated while bent.In addition, the effect by roller 20 on two groups and lower roller 21 can improve steel band mother metal Elongation, the otherness to extend between scale and mother metal is increased, so as to increase the crack openings degree of steel strip surface scale.
Fig. 2 and Fig. 4 are refer to, because the diameter of upper straightening roll 30 is more than or less than the diameter of lower smoothing roll 31, works as steel band During by two aligning roller groups 3, each group of upper straightening roll 30 and lower smoothing roll 31 and the contact area and dynamics on the upper and lower surface of steel band Difference, so as to which steel band be aligned, while the C for eliminating steel band sticks up (cupping bent along width of steel band direction) and L sticks up and (rolled on edge The lonitudinal warping that direction processed bends).In the present embodiment, the diameter of the upper straightening roll 30 of the first aligning roller group 3 is less than lower rectify The diameter of straight roller 31, the diameter of the upper straightening roll 30 of the second aligning roller group 3 are more than the diameter of lower smoothing roll 31；It should be understood that The diameter of the upper straightening roll 30 of first aligning rolling group is more than the diameter of lower smoothing roll 31, the upper straightening roll 30 of the second aligning roller group 3 Diameter be less than the diameter of lower smoothing roll 31, it is only necessary to ensure the diameter difference of each group of upper straightening roll 30 and lower smoothing roll 31 i.e. Can, it is not limited thereto.
Then, the scale of skin breakage will be removed by the way of grinding is scrubbed via the steel band that the second jockey pulley 4 conveys； The grease of steel strip surface is removed in the presence of grinding, while causes the scale tissue of steel strip surface to become loose, after raising The efficiency of continuous chemical derusting.
Then, the steel band after grinding is scrubbed is removed to the scale of steel strip surface using electrolysis mode；Electrolyte uses Neutral salt electrolyte, the scale of steel strip surface changes into Cr (OH) during electrolysis3With Fe (OH)3Precipitation is removed, and in electrolytic process Caused O2And H2The scale of steel strip surface is peeled off；Wherein, steel band is first used as anode during electrolysis, is re-used as negative electrode, alternately becomes Change, chemical reaction is as follows：
Anode reaction:
Cr2O3+5H2O→2CrO4 2-+10H++6e-----(1)
Cr2O3+4H2O→Cr2O7 2-+8H++6e-----(2)
Fe2O3→2Fe3++3/2O2↑+6e-----(3)
H2O→1/2O2↑+2H++2e-----(4)
Cathode reaction:
CrO4 2-+4H2O+3e-→Cr(OH)3↓+5OH-----(5)
Cr2O7 2-+7H2O+6e-→2Cr(OH)3↓+8OH-----(6)
Fe3++3OH-→Fe(OH)3↓----(7)
2H2O+2e-→H2↑+2OH-----(8)
Wherein, electrolyte NaSO4Solution, the scale containing Fe is mainly Fe in steel band2O3, during electrolysis, due to the rust of steel band Skin comparison of ingredients is complicated, except Fe2O3In addition, also it is insoluble in the Cr of acid2O3, and Cr2O3Mainly pass through the method for neutral salt electrolysis Remove.Above-mentioned electrolytics reaction equation is understood, when steel band is as anode, can be obtained by (1), (2), (3) reaction equation, steel band table Cr in the scale of face2O3Lose electronics and be changed into chromate ion (CrO4 2-Or Cr2O7 2-), Fe2O3Lose electronics and be changed into Fe3+, by anti- Formula (3) and (4) are answered to obtain and produce oxygen (O in electrolytic process2).When steel band as negative electrode participate in cell reaction when, by (5), (6), (7) reaction equation can obtain, chromate ion (CrO4 2-Or Cr2O7 2-) obtain electronics and be changed into Cr3+, then with the OH in electrolyte- Reaction generation Cr (OH)3Precipitation, and Fe3+With the OH in electrolyte-Reaction generation Fe (OH)3Precipitation；It is water in reaction equation (8) Electrolysis, there is hydrogen (H2) produce.During electrolysis steel strip surface into O2And H2Mechanical stripping is played a part of to scale, by so The scale of steel strip surface is removed.In the cell reaction, the electrolyte NaSO in electrolyte4It is anti-due to not participating in chemistry directly Should, do not consume electrolyte NaSO in theory4, consumption be only electrolyte in water.
By the research to negative electrode and anode time relationship, determine that cathode span is the anode time 2 times the most rationally, Under the condition background, the influence of concentration of electrolyte, current density and electrolysis temperature to electrolytic efficiency is studied respectively.
Fig. 5 is refer to, is passing through the research to the time relationship of negative electrode and anode, current density and electrolyte temperature Under, consider influence of the concentration of electrolyte to electrolytic efficiency.The selected electrolyte temperature of experiment is 75 DEG C, and electrolyte pH is 5.5, anode Electrolysis time is 10s, current density 4C/dm2, optimal concentration ranges are drawn by changing concentration of electrolyte.Can by Fig. 5 Know, in NaSO4In electrolyte of the concentration of solution higher than 5%, with NaSO4The raising of solution concentration, NaSO4In solution just, The interaction force increase of anion, so as to reduce the actual concentrations of free ion, causes NaSO on the contrary4The conductive energy of solution Power reduces；And the concentration of electrolyte is higher, the carry-over loss with respect to electrolyte also increases, and works as NaSO4Solution concentration is more than 25% When, NaSO4The pipeline and heat exchanger of easy Crystallization Plugging relevant device, so as to damage the valve of equipment and pump etc..NaSO4Solution Although carry-over loss is less when concentration is low, the electric conductivity of electrolyte, the increase of electric current cost can be reduced.Thus, in actual production NaSO4The concentration of solution typically can be controlled in 15%~25%.In this implementation, NaSO4Solution concentration is NaSO4With the quality of water Percentage.
Fig. 6 is refer to, passes through the research to the time relationship of negative electrode and anode, concentration of electrolyte and electrolyte temperature Under, consider influence of the current density of electrolysis to electrolytic efficiency.The selected electrolyte temperature of experiment is 75 DEG C, and sodium sulphate electrolyte is dense Spend for 20%, electrolyte pH is 5.5, and the anode electrolysis time is 10s, and optimal current density is determined by changing current density Section.It will be appreciated from fig. 6 that as current density increases, the weightless increase of steel band, when current density is in 4~12C/dm2In the range of When, the weightless change of steel band is little, therefore will not cause the loss of steel band.But because current density becomes big, electrode reaction production Raw gas increase, so as to reduce current efficiency；And current density is big, electric current and voltage request are high, are drawn by circuit heating The energy consumption risen is big, and after therefore, during practical application considering electrolytic efficiency and economy, current density is controlled in 4~6C/ dm2。
Fig. 7 is refer to, by under the research to the time relationship of negative electrode and anode, concentration of electrolyte and current density, Consider influence of the temperature of electrolysis to electrolytic efficiency.The selected sodium sulphate concentration of electrolyte of experiment is 20%, and electrolyte pH is 5.5, The anode electrolysis time is 10s, current density 4C/dm2, pass through the temperature range for changing the temperature of electrolyte to determine optimal. As shown in Figure 7, with the rise of temperature, the weightless increase of steel band.When electrolysis temperature is at 40~50 DEG C, the mistake of steel band after electrolysis Change unobvious again, but in the temperature range, ion transport is poor, electrolytic efficiency is low；When electrolysis temperature is at 50~70 DEG C When, the weightlessness of steel band quickly increases with the rising of temperature, easily causes the heavy losses of steel band；When electrolysis temperature 70~ At 80 DEG C, the weight-loss ratio change unobvious of steel band, because temperature raises, ion transport is good, and ionic activity is big, electrolysis effect Rate is high；When temperature reaches certain value, the activity of electrolyte intermediate ion has tended to maximum, continues to raise temperature to ionic activity Influence unobvious.Thus, in the case that the temperature control of electrolysis can be ensured into steel band weightlessness is small between 70~80 DEG C Electrolytic efficiency is high.
Finally, the steel band after electrolysis is subjected to nitration mixture pickling；Wherein, mixed acid solution is HF and HNO3Mixing it is molten Liquid.Nitration mixture pickling is divided into two sections, and first paragraph removes the remaining scale of steel strip surface using HF, and second segment uses HNO3It is anti-with steel band Should, pass through HNO3Passivating film is formed in steel strip surface so that steel strip surface has metal light with the nitrogen oxides of steel band reaction generation Pool.
To sum up, casting skin coil of strip derusting process of the invention, the broken phosphorus of gas is involved in black rust steel by using the broken phosphorus machine in four stations and is removed Rust so that the crack openings degree of steel strip surface scale increases, and enhances the effect of scale peeling, to improve follow-up electrolytic derusting And the efficiency of nitration mixture pickling provides good surface condition, so as to enhance the derusting ability of whole technological process, improve Production efficiency.Compared to traditional casting skin coil of strip derusting process, avoid being derusted using sand-blasting machine, so as to reduce steel strip surface Roughness, for improve final cold rolling product quality lay the foundation, expand the use range of product.
Without departing from the thought of the invention, the various different embodiments of the present invention are combined, all should When being considered as present disclosure；In the range of the technology design of the present invention, a variety of simple modifications are carried out to technical scheme And any combination of the thought without prejudice to the invention that different embodiments are carried out, all should protection scope of the present invention it It is interior.

Claims (6)

1. a kind of casting skin coil of strip derusting process, it is characterised in that comprise the following steps：
Casting skin coil of strip is broken into phosphorus machine by four stations and carries out brokenly phosphorus derusting；Wherein, phosphorus machine is broken at four stations includes the first jockey pulley, two successively Roller group, two aligning roller groups and the second jockey pulley；Each roller group includes upper roller and lower roller, the diameter of upper roller etc. In the diameter of lower roller, each aligning roller group includes upper straightening roll and lower smoothing roll, under the diameter of upper straightening roll is more than or less than The diameter of smoothing roll；Casting skin coil of strip first passes around the first jockey pulley so that casting skin coil of strip is spread apart in the form of steel band, Ran Hougang Band is operated by two roller groups and causes steel band bending, improved the elongation of steel band, increase scale simultaneously by upper roller and lower roller The otherness to extend between mother metal, so as to increase the crack openings degree of steel strip surface scale, while eliminate the side wave of steel band；Again By two aligning roller groups, operated simultaneously by upper straightening roll and lower smoothing roll and eliminate the C of steel band and stick up and stuck up with L；Finally by the second tension force Roller is delivered to next process；
The scale of skin breakage will be removed by the way of grinding is scrubbed via the steel band that the second jockey pulley conveys；In the work of grinding With it is lower removal steel strip surface grease, while cause steel strip surface scale tissue looseness；
Steel band after grinding is scrubbed is removed to the scale of steel strip surface using electrolysis mode；Wherein, electrolyte uses NaSO4 Solution, the scale of steel strip surface changes into Cr (OH) during electrolysis3With Fe (OH)3Precipitation is removed, and caused O in electrolytic process2 And H2The scale of steel strip surface is peeled off；Wherein, steel band is first used as anode during electrolysis, is re-used as negative electrode, alternately changes, chemistry is anti- Should be as follows：
Anode reaction:
Cr2O3+5H2O→2CrO4 2-+10H++6e-----(1)
Cr2O3+4H2O→Cr2O7 2-+8H++6e-----(2)
Fe2O3→2Fe3++3/2O2↑+6e-----(3)
H2O→1/2O2↑+2H++2e-----(4)
Cathode reaction:
CrO4 2-+4H2O+3e-→Cr(OH)3↓+5OH-----(5)
Cr2O7 2-+7H2O+6e-→2Cr(OH)3↓+8OH-----(6)
Fe3++3OH-→Fe(OH)3↓----(7)
2H2O+2e-→H2↑+2OH-----(8) 。
2. casting skin coil of strip derusting process as claimed in claim 1, it is characterised in that：Steel band after electrolysis is subjected to nitration mixture Pickling；Wherein, mixed acid solution is HF and HNO3Mixed solution.
3. casting skin coil of strip derusting process as claimed in claim 1, it is characterised in that：The current density of electrolysis is 4~6C/dm2。
4. casting skin coil of strip derusting process as claimed in claim 1, it is characterised in that：The concentration of electrolyte is 15%~25%.
5. casting skin coil of strip derusting process as claimed in claim 1, it is characterised in that：The temperature of electrolysis is 70~80 DEG C.
6. casting skin coil of strip derusting process as claimed in claim 2, it is characterised in that：Nitration mixture pickling is divided into two sections, and first paragraph is adopted The remaining scale of steel strip surface is removed with HF, second segment uses HNO3Reacted with steel band, pass through HNO3With the nitrogen of steel band reaction generation Oxide forms passivating film in steel strip surface so that steel strip surface has metallic luster.
CN201710041362.9A 2017-01-20 2017-01-20 A kind of casting skin coil of strip derusting process Pending CN107413771A (en)

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Application publication date: 20171201