CN111560576B - Production process of galvanized steel coil - Google Patents
Production process of galvanized steel coil Download PDFInfo
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- CN111560576B CN111560576B CN202010588545.4A CN202010588545A CN111560576B CN 111560576 B CN111560576 B CN 111560576B CN 202010588545 A CN202010588545 A CN 202010588545A CN 111560576 B CN111560576 B CN 111560576B
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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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
- 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
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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
- 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
- C23C22/73—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 characterised by the process
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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 a production process of a galvanized steel coil, which comprises the following steps: s1, unwinding, cutting head and tail, and welding the cold-rolled hard steel coil in sequence; s2, preparing degreasing solution, sequentially immersing the steel coil processed by the S1 into the degreasing solution, brushing by a brush roller, drying by hot air, and processing by an inlet loop; s3, annealing the steel coil obtained in the S1; s4, placing the annealed steel coil into a zinc pot, soaking for 4-5S, and then sequentially carrying out air knife blowing, cooling, hot air drying and finishing to obtain a galvanized steel coil; s5, heating the galvanized steel coil, taking out the galvanized steel coil, sucking the passivation liquid drops on the surface of the galvanized steel coil by using a suction pipe, and drying; s6, carrying out fingerprint-resistant coating treatment on the steel coil treated in the step S5, and oiling the steel coil after the steel coil passes through an outlet loop; and S7, cutting, curling, coil unloading and packaging the steel coil obtained in the S6. The production process of the galvanized steel coil can effectively remove dust, iron powder and other pollutants firmly adhered to the surface of the steel coil, and is beneficial to improving the quality of the galvanized steel coil, so that the service life of the galvanized steel coil is prolonged.
Description
Technical Field
The invention relates to the technical field of steel coil processing, in particular to a production process of a galvanized steel coil.
Background
The production process of the hot galvanized steel coil takes a cold-rolled hard steel coil as a raw material, and the cold-rolled hard steel coil is immersed into a molten zinc bath, so that a layer of zinc is adhered to the surface of the cold-rolled hard steel coil. The galvanized steel coil has excellent corrosion resistance, can prolong the service life, and is widely applied to the industries of construction, light industry, automobile, agriculture, animal husbandry, fishery, commerce and the like, such as the construction industry which is mainly used for manufacturing anti-corrosion industry and civil building roof panels, roof grids and the like; the light industry uses the composite material to manufacture home appliance shells, civil chimneys, kitchen utensils and the like; the automobile industry is mainly used for manufacturing corrosion-resistant parts of cars and the like; the farming, animal husbandry and fishery industry is mainly used as a tool for grain storage and transportation, meat and aquatic product freezing processing and the like; the commercial products are mainly used for storage, transportation, packaging and the like of materials.
In order to enhance the weather resistance and corrosion resistance of the galvanized steel coil, a finish paint layer is usually coated on the galvanized steel coil in the prior art, and the finish paint layer is usually composed of acrylic paint, aliphatic polyurethane paint or acrylic polyurethane paint, and the acrylic polyurethane paint has good weather resistance and corrosion resistance, so that the service life of the galvanized steel coil is prolonged.
In the chinese patent application with publication number CN104561875A, a hot galvanizing production process of a high-strength galvanized sheet is disclosed, which comprises the following process steps: 1.2, a cold-rolled low-carbon steel base plate is adopted, and the selected raw material plate shape has the requirement of a sharp degree of less than 1.2 percent and has no defects of lotus leaf edges and the like; because the annealing temperature of the all-hard steel is low, the necking quantity is 0-1mm, the width of the plate shape of the raw material is required to be executed according to the lower limit of the internal control standard of the galvanized raw material, and 3, the parameters are configured for the thermal regulation of the continuous annealing furnace for the all-hard steel raw material plate shape: 4. tension configuration parameters of each section of the galvanized sheet, 5, furnace pressure control, increasing the furnace pressure of an annealing furnace from 70-80Pa to 100-150Pa, 6, controlling the transition process, controlling the speed of a unit at 45MPM, gradually reducing the temperature of the annealing sheet from 570 ℃ to 480 ℃ within about 60 minutes of operation, and keeping the speed of the unit stable until the planned production of the steel coil is nearly finished, 7, adjusting the chemical components of the galvanizing solution, and increasing the Al content in the zinc solution to 0.15-0.19%; 8. controlling the withdrawal and straightening machine, and setting the elongation rate to be 0.2-0.25%. According to the hot galvanizing production process of the high-strength galvanized sheet, due to incomplete annealing, proper recovery occurs inside the galvanized sheet material, the steel sheet keeps cold deformation fibers, and therefore the strength of the galvanized sheet is improved while a certain elongation is kept.
However, the above technical solutions have the following disadvantages: contaminants such as dust and iron powder are easily and firmly adhered to the surface of a cold-rolled low-carbon steel substrate, the quality of a galvanized steel sheet is greatly influenced by the presence of the contaminants, and a galvanized layer on the surface of the steel sheet is easily peeled off after a long time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the production process of the galvanized steel coil, which can effectively remove dust, iron powder and other pollutants firmly adhered to the surface of the steel coil, is favorable for improving the quality of the galvanized steel coil and further prolongs the service life of the galvanized steel coil.
The above object of the present invention is achieved by the following technical solutions: a production process of a galvanized steel coil comprises the following steps:
s1, uncoiling the cold-rolled hard steel coil by an uncoiler, cutting the head and the tail, and welding by an automatic seam welder;
s2, weighing 15-25 parts of sodium hyaluronate and 140 parts of deionized water of 130-25 parts in proportion, adding the sodium hyaluronate into a glass container, stirring at room temperature to completely dissolve the sodium hyaluronate, adjusting the pH value of the solution to 5-6, then adding 2-3 parts of gallium chloride and 15-25 parts of sodium silicate, stirring at room temperature at a rotation speed of 650-25 r/min for 3-5h to prepare degreasing fluid, and then sequentially immersing the cold-rolled hard steel coil treated by S1 into the degreasing fluid, brushing by a brush roll, drying by hot air, and looping by an inlet to obtain a degreased cold-rolled hard steel coil;
s3, annealing the degreased cold-rolled hard steel coil obtained in the S2 to obtain an annealed steel coil;
s4, placing the annealed steel coil into a zinc pot, wherein the temperature of zinc liquid is 455-460 ℃, the soaking time of the annealed steel coil is 4-5S, and then sequentially carrying out air knife blowing, cooling, hot air drying and four-roller wet finishing machine finishing to obtain a galvanized steel coil; wherein, in the air knife blowing process, the flow of the air knife is 540-550L/min;
s5, placing the galvanized steel coil obtained in the step S4 in a baking oven at 45 ℃ for heating for 25-30min, taking out the galvanized steel coil, fixing the galvanized steel coil on a glass plate, sucking the passivation liquid drop on the edge of the galvanized steel coil by using a suction pipe, uniformly coating the passivation liquid on the surface of the galvanized steel coil by using a stick wrapping cotton cloth, immediately placing the galvanized steel coil in the baking oven at 125 ℃ for baking for 85-90S, and standing for 12 h;
s6, carrying out fingerprint-resistant coating treatment on the galvanized steel coil subjected to the treatment of S5, and carrying out oiling treatment by using an electrostatic oiling machine after passing through an outlet loop to obtain an oiled galvanized steel coil;
and S7, slitting, curling, coil unloading and packaging the oil-coated galvanized steel coil obtained in the step S6.
By adopting the technical scheme, the sodium hyaluronate is a polyhydroxy acid salt and is easy to coordinate with the gallium salt to form a plurality of chelating rings, after the cold-rolled hard steel coil is immersed in the degreasing fluid, a layer of compact hyaluronic acid gallium molecular protective film is generated on the surface of the galvanized steel coil, the transfer and the transfer of oxygen and electrons on the surface of the galvanized steel coil and between the solutions are effectively prevented, the dissolution of zinc is inhibited, gallium is deposited in the passivation film, the cathode process of the electrochemical corrosion of the galvanized steel coil is inhibited, the cathode protection time is prolonged, and the good corrosion prevention effect is exerted. In addition, the sodium hyaluronate and the gallium chloride are coordinated to form a chelate, and dust, iron powder and other impurities adhered to the surface of the steel coil are removed through chelation, so that the degreasing effect of the cold-rolled hard steel coil is enhanced, the galvanizing quality of the cold-rolled hard steel coil is favorably enhanced, and the service life of the galvanized steel coil is prolonged. The edge of the galvanized steel coil is dripped with the passivation solution, and the passivation solution is uniformly coated on the surface of the galvanized steel coil through the stick, so that a layer of passivation film is formed on the surface of the galvanized steel coil, and the corrosion resistance of the galvanized steel coil in a severe environment is favorably enhanced.
The present invention in a preferred example may be further configured to: in step S2, the degreasing fluid further includes 3 to 7 parts by weight of sodium stearate.
By adopting the technical scheme, the fatty acid sodium can improve the activity of the oil stain on the surface of the steel coil, so that the adhesion force of the oil stain is weakened, after the degreasing solution soaks the surface of the steel coil and is brushed by the brush roller, lipophilic groups and small oil droplets in the fatty acid sodium fully have affinity action, and an emulsion oil film and other impurities are separated from the surface of the steel coil through permeation and dispersion action, so that the purpose of removing the oil stain is achieved, and the degreasing effect of the steel coil is favorably improved.
The invention in a preferred example may be further configured to: in the step S5, the passivation solution specifically includes the following components in parts by weight: 15-25 parts of 20-30g/L iron phosphate solution and 10-20 parts of 15-20g/L manganese phosphate solution.
Through adopting above-mentioned technical scheme, make the passivation solution and drip in galvanized steel coil surface by iron phosphate solution and manganese phosphate solution, galvanized steel coil surface is through the bonderizing, produces the phosphate rete that the one deck is fine firm, chemical stability is stable, difficult to be corroded for the adhesive force of later stage fat liquoring on the bonderizing galvanized steel coil strengthens greatly, and the coating is more firm, is difficult for droing, has further strengthened the corrosion resisting property of galvanized steel coil.
The invention in a preferred example may be further configured to: in the step S2, the linear speed before the inlet loop is 90-100 m/min.
Through adopting above-mentioned technical scheme, after the coil of strip after the degreasing treatment through hot air drying, the coil of strip heat when absorbing hot air drying gets into the entry loop, continues the drying through the residual heat to make the moisture on its surface fully got rid of, difficult adhesion impurity has further promoted the quality of galvanized coil of strip.
The present invention in a preferred example may be further configured to: in the step S4, the zinc liquid comprises 0.06-0.1wt% of aluminum.
By adopting the technical scheme, 0.06-0.1wt% of aluminum is added into the zinc liquid, and after the steel coil is galvanized, a zinc-aluminum alloy coating is formed on the surface of the steel coil, which is beneficial to improving the corrosion resistance of the galvanized steel coil.
The invention in a preferred example may be further configured to: in the step S4, the air knife blowing speed is 490-500 mm/S.
By adopting the technical scheme, the air knife blowing is beneficial to enabling the zinc layer to be uniformly distributed on the surface of the cold-rolled hard steel coil, so that the formed galvanized steel coil has uniform thickness, the zinc layer can form more stable protection on the galvanized steel coil, and the probability of corrosion or oxidation of the galvanized steel coil is reduced.
The present invention in a preferred example may be further configured to: in the step S1, the cold-rolled hard steel coil comprises 0.025-0.035wt% of carbon, 0.004-0.008wt% of silicon, 0.16-0.20wt% of manganese, 0.001-0.020wt% of phosphorus, 0.005-0.015wt% of sulfur, 0.025-0.040wt% of aluminum, and 0.005-0.015wt% of molybdenum.
By adopting the technical scheme, the hard steel coil contains molybdenum, and the molybdenum and carbon in the steel coil form carbide at a higher annealing temperature, so that the annealing brittleness caused by other alloy elements can be reduced or inhibited, and the heat strength and the creep strength of the steel coil are improved.
The invention in a preferred example may be further configured to: in the step S1, the thickness of the cold-rolled hard steel coil is 0.4-0.8 mm.
In summary, the invention includes at least one of the following beneficial technical effects:
1. according to the invention, sodium hyaluronate is a polyhydroxy acid salt, and is easy to coordinate with gallium salt to form a plurality of chelating rings, after a cold-rolled hard steel coil is immersed in degreasing fluid, a layer of compact hyaluronic acid gallium molecular protective film is generated on the surface of a galvanized steel coil, so that transfer and transfer of oxygen and electrons on the surface of the galvanized steel coil and among solutions are effectively prevented, dissolution of zinc is inhibited, gallium is deposited in a passivation film, and a cathode process of electrochemical corrosion of the galvanized steel coil is inhibited, thus the cathode protection time is prolonged, and a good corrosion prevention effect is exerted. In addition, the sodium hyaluronate and the gallium chloride are coordinated to form a chelate, and impurities such as dust, iron powder and the like adhered to the surface of the steel coil are removed through chelation, so that the degreasing effect of the cold-rolled hard steel coil is enhanced, the galvanizing quality of the cold-rolled hard steel coil is enhanced, and the service life of the galvanized steel coil is prolonged. The edge of the galvanized steel coil is dripped with the passivation solution, and the passivation solution is uniformly coated on the surface of the galvanized steel coil through the stick, so that a layer of passivation film is formed on the surface of the galvanized steel coil, and the corrosion resistance of the galvanized steel coil in a severe environment is favorably enhanced;
2. in the invention, the fatty acid sodium can improve the activity of the oil stain on the surface of the steel coil, so that the adhesion force of the oil stain is weakened, after the degreasing solution soaks the surface of the steel coil and is brushed by the brush roller, lipophilic groups and small oil beads in the fatty acid sodium fully generate affinity action, and an emulsion oil film and other impurities are separated from the surface of the steel coil through the permeation and dispersion action, so that the aim of removing the oil stain is fulfilled, and the degreasing effect of the steel coil is favorably improved;
3. in the invention, 0.06-0.1wt% of aluminum is added into the zinc solution, and after the steel coil is galvanized, a zinc-aluminum alloy coating is formed on the surface of the steel coil, which is beneficial to improving the corrosion resistance of the galvanized steel coil.
Detailed Description
The present invention will be described in further detail with reference to examples.
Table 1 chemical composition and content of cold rolled hard steel coil in examples 1-3
| Carbon wt.% | Silicon wt.% | Manganese wt.% | Phosphorus wt.% | Sulfur wt.% | Aluminum wt.% | Molybdenum wt.% | |
| Example 1 | 0.03 | 0.006 | 0.18 | 0.0105 | 0.01 | 0.0325 | 0.01 |
| Example 2 | 0.025 | 0.004 | 0.16 | 0.001 | 0.005 | 0.025 | 0.005 |
| Example 3 | 0.035 | 0.008 | 0.2 | 0.02 | 0.015 | 0.04 | 0.015 |
Example 1
A production process of a galvanized steel coil comprises the following steps:
s1, taking a cold-rolled hard steel coil with the thickness of 0.6mm, sequentially uncoiling the steel coil by an uncoiler, cutting the head and the tail, and welding the steel coil by an automatic seam welder, wherein the chemical components and the contents of the steel coil are shown in Table 1;
s2, weighing 200g of sodium hyaluronate and 1350g of deionized water according to a proportion, adding the sodium hyaluronate into a glass container, stirring the sodium hyaluronate at room temperature to completely dissolve the sodium hyaluronate, adjusting the pH of the solution to 5.5, then adding 25g of gallium chloride, 200g of sodium silicate and 50g of sodium stearate, stirring the solution at room temperature at a rotating speed of 625r/min for 4 hours to prepare degreasing fluid, and then sequentially immersing the cold-rolled hard steel coil treated by the S1 into the degreasing fluid, brushing the cold-rolled hard steel coil by using a brush roll, drying the cold-rolled hard steel coil by hot air, and looping the degreased cold-rolled hard steel coil through an inlet to obtain a degreased cold-rolled hard steel coil; wherein the linear speed before the inlet loop is 95 m/min;
s3, annealing the degreased cold-rolled hard steel coil obtained in the S2 to obtain an annealed steel coil;
s4, placing the annealed steel coil into a zinc pot, wherein zinc liquid in the zinc pot consists of 0.08 wt% of aluminum and 0.92 wt% of zinc, the temperature of the zinc liquid is 457.5 ℃, the soaking time of the annealed steel coil is 4.5S, and then sequentially blowing by an air knife, cooling, drying by hot air and finishing by a four-roller wet finishing machine to obtain the galvanized steel coil; wherein, in the air knife purging process, the flow of the air knife is 545L/min, and the purging speed of the air knife is 495 mm/s;
s5, weighing 200g of 25g/L ferric phosphate solution and 150g of 17.5g/L manganese phosphate solution according to a proportion, mixing to prepare passivation solution, then placing the galvanized steel coil obtained in the S4 in a 45 ℃ oven for heating for 27.5min, taking out and fixing on a glass plate, sucking the passivation solution by a suction pipe to drip on the edge of the galvanized steel coil, then uniformly coating the passivation solution on the surface of the galvanized steel coil by a stick wrapping cotton cloth, immediately placing in a 125 ℃ oven for baking for 87.5S, and standing for 12 h;
s6, carrying out fingerprint-resistant coating treatment on the galvanized steel coil subjected to the treatment of S5, and carrying out oiling treatment by using an electrostatic oiling machine after passing through an outlet loop to obtain an oiled galvanized steel coil;
and S7, slitting, curling, coil unloading and packaging the oil-coated galvanized steel coil obtained in the step S6.
Example 2
A production process of a galvanized steel coil comprises the following steps:
s1, taking a cold-rolled hard steel coil with the thickness of 0.4mm, sequentially uncoiling the steel coil by an uncoiler, cutting the head and the tail, and welding the steel coil by an automatic seam welder, wherein the chemical components and the contents of the steel coil are shown in Table 1;
s2, weighing 150g of sodium hyaluronate and 1300g of deionized water according to a proportion, adding the sodium hyaluronate into a glass container, stirring the sodium hyaluronate at room temperature to completely dissolve the sodium hyaluronate, adjusting the pH value of the solution to 5, then adding 20g of gallium chloride, 150g of sodium silicate and 30g of sodium stearate, stirring the solution at the room temperature at a rotating speed of 600r/min for 3 hours to prepare degreasing solution, and then sequentially immersing the cold-rolled hard steel coil treated by S1 into the degreasing solution, brushing the cold-rolled hard steel coil by using a brush roll, drying the cold-rolled hard steel coil by hot air, and looping the cold-rolled hard steel coil through an inlet to obtain a degreased cold-rolled hard steel coil; wherein the linear speed before the inlet loop is 90 m/min;
s3, annealing the degreased cold-rolled hard steel coil obtained in the S2 to obtain an annealed steel coil;
s4, placing the annealed steel coil into a zinc pot, wherein zinc liquid in the zinc pot consists of 0.06 wt% of aluminum and 0.9 wt% of zinc, the temperature of the zinc liquid is 455 ℃, the infiltration time of the annealed steel coil is 4S, and then blowing by an air knife, cooling, drying by hot air and finishing by a four-roller wet finishing machine in sequence to obtain the galvanized steel coil; wherein, in the air knife blowing process, the flow of the air knife is 540L/min, and the blowing speed of the air knife is 490 mm/s;
s5, weighing 150 g/L of iron phosphate solution 20g/L and 100g of manganese phosphate solution 15g/L in proportion, mixing to prepare passivation solution, then placing the galvanized steel coil obtained in the step S4 in a 45 ℃ oven for heating for 25min, taking out and fixing the galvanized steel coil on a glass plate, sucking passivation liquid drops on the edge of the galvanized steel coil by using a suction pipe, then uniformly coating the passivation solution on the surface of the galvanized steel coil by using a stick wrapping cotton cloth, immediately placing the galvanized steel coil in a 125 ℃ oven for baking for 85S, and standing for 12 h;
s6, carrying out fingerprint-resistant coating treatment on the galvanized steel coil subjected to the treatment of S5, and carrying out oiling treatment by using an electrostatic oiling machine after passing through an outlet loop to obtain an oiled galvanized steel coil;
and S7, slitting, curling, coil unloading and packaging the oil-coated galvanized steel coil obtained in the step S6.
Example 3
A production process of a galvanized steel coil comprises the following steps:
s1, taking a cold-rolled hard steel coil with the thickness of 0.8mm, sequentially uncoiling the coil by an uncoiler, cutting the head and the tail, and welding the coil by an automatic seam welder, wherein the chemical components and the content of the coil are shown in Table 1;
s2, weighing 250g of sodium hyaluronate and 1400g of deionized water according to a proportion, adding the sodium hyaluronate and 1400g of deionized water into a glass container, stirring at room temperature to completely dissolve the sodium hyaluronate, adjusting the pH value of the solution to 6, then adding 30g of gallium chloride, 250g of sodium silicate and 70g of sodium stearate, stirring at room temperature at a rotation speed of 650r/min for 5 hours to prepare degreasing solution, and then sequentially immersing the cold-rolled hard steel coil treated by S1 into the degreasing solution, scrubbing by using a brush roll, drying by hot air, and looping through an inlet to obtain a degreased cold-rolled hard steel coil; wherein the linear speed before the inlet loop is 100 m/min;
s3, annealing the degreased cold-rolled hard steel coil obtained in the S2 to obtain an annealed steel coil;
s4, placing the annealed steel coil into a zinc pot, wherein zinc liquid in the zinc pot consists of 0.1wt% of aluminum and 0.94 wt% of zinc, the temperature of the zinc liquid is 460 ℃, the soaking time of the annealed steel coil is 5S, and then sequentially carrying out air knife blowing, cooling, hot air drying and four-roller wet finishing machine finishing to obtain the galvanized steel coil; wherein, in the air knife blowing process, the flow of the air knife is 550L/min, and the blowing speed of the air knife is 500 mm/s;
s5, weighing 250g of 30g/L ferric phosphate solution and 200g of 20g/L manganese phosphate solution according to a ratio, mixing to prepare passivation solution, then placing the galvanized steel coil obtained in the S4 in a 45 ℃ oven for heating for 30min, taking out and fixing on a glass plate, sucking the passivation solution by a suction tube to drip on the edge of the galvanized steel coil, then uniformly coating the passivation solution on the surface of the galvanized steel coil by a stick wrapping cotton cloth, immediately placing in a 125 ℃ oven for baking for 90S, and standing for 12 h;
s6, carrying out fingerprint-resistant coating treatment on the galvanized steel coil subjected to the treatment of S5, and carrying out oiling treatment by using an electrostatic oiling machine after passing through an outlet loop to obtain an oiled galvanized steel coil;
and S7, slitting, curling, coil unloading and packaging the oil-coated galvanized steel coil obtained in the step S6.
Comparative example 1
The difference between this comparative example and example 1 is that the hard steel coil was cold rolled without molybdenum in step S1.
Comparative example 2
The difference between this comparative example and example 1 is that in step S2, sodium hyaluronate was not added.
Comparative example 3
The difference between this comparative example and example 1 is that gallium chloride was not added in step S2.
Comparative example 4
The difference between this comparative example and example 1 is that in step S2, no sodium stearate was added.
Comparative example 5
The difference between this comparative example and example 1 is that in step S4, aluminum was not added to the zinc bath.
Comparative example 6
The difference between this comparative example and example 1 is that the air knife purge speed in step S4 was 480 mm/S.
Comparative example 7
The difference between this comparative example and example 1 is that the air knife purge speed in step S4 is 485 mm/S.
Comparative example 8
The difference between this comparative example and example 1 is that the air knife purge speed in step S4 was 505 mm/S.
Comparative example 9
The difference between this comparative example and example 1 is that the air knife purge speed in step S4 was 510 mm/S.
Comparative example 10
The difference between this comparative example and example 1 is that in step S5, no iron phosphate solution was added.
Comparative example 11
The difference between this comparative example and example 1 is that in step S5, no manganese phosphate solution was added.
Comparative example 12
The difference between this comparative example and example 1 is that in step S6, no oiling treatment was performed.
Firstly, performance detection: adhesion detection
The galvanized steel coils obtained in examples 1-3 and comparative examples 1-12 were subjected to a bending test in accordance with GB/T232-2010, and the separation of the zinc layer and the cracking of the zinc layer were recorded except for 5mm from the edge of the bent portion of the sample, and the results are shown in Table 2.
And (4) detecting the performance: corrosion resistance testing
A sample having a size of 1000 mm. times.1000 mm was taken from each of the galvanized steel coils obtained in examples 1 to 3 and comparative examples 1 to 12, the sample was laid flat in 55% NaCl solution at room temperature, and the time when the corrosion phenomenon occurred in the sample was observed and recorded, and the results are shown in Table 2.
Table 2 results of performance tests of galvanized steel coils obtained in examples 1 to 3 and comparative examples 1 to 12
As can be seen from table 2:
comparative example 1 compared with example 1, molybdenum is not added, which affects the brittleness of the galvanized steel coil.
Compared with the example 1, the degreasing fluid lacks effective components and affects the corrosion resistance of the galvanized steel coil without adding sodium hyaluronate, gallium chloride or sodium stearate. In addition, sodium hyaluronate or gallium chloride is not added, so that the adhesive force of a zinc layer on the surface of the galvanized steel coil is obviously reduced.
In comparative examples 6 to 9, the air knife blowing speed was less than 490mm/s or more than 500mm/s, and the adhesion of the zinc layer on the surface of the galvanized steel coil having a smaller thickness was reduced, as compared with example 1.
Comparative examples 10 to 12 compared to example 1, the corrosion resistance of the galvanized steel coil was decreased without adding the iron phosphate solution, the manganese phosphate solution, or the oiling treatment.
In conclusion, the sodium hyaluronate is a polyhydroxy acid salt and is easy to coordinate with the gallium salt to form a plurality of chelating rings, and after the cold-rolled hard steel coil is immersed in the degreasing fluid, a layer of compact hyaluronic acid gallium molecule protective film is generated on the surface of the galvanized steel coil, so that the transfer and transfer of oxygen and electrons on the surface of the galvanized steel coil and among solutions are effectively prevented, the dissolution of zinc is inhibited, gallium is deposited in the passivation film, the cathode process of electrochemical corrosion of the galvanized steel coil is inhibited, the cathode protection time is prolonged, and a good corrosion prevention effect is exerted. In addition, the sodium hyaluronate and the gallium chloride are coordinated to form a chelate, and dust, iron powder and other impurities adhered to the surface of the steel coil are removed through chelation, so that the degreasing effect of the cold-rolled hard steel coil is enhanced, the galvanizing quality of the cold-rolled hard steel coil is favorably enhanced, and the service life of the galvanized steel coil is prolonged. The passivation solution is dripped at the edge of the galvanized steel coil, and is uniformly coated on the surface of the galvanized steel coil through the stick, so that a layer of passivation film is formed on the surface of the galvanized steel coil, and the corrosion resistance of the galvanized steel coil in a severe environment is favorably enhanced.
The present embodiment is only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications to the present embodiment as necessary without inventive contribution after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (2)
1. The production process of the galvanized steel coil is characterized by comprising the following steps of:
s1, uncoiling the cold-rolled hard steel coil by an uncoiler, cutting the head and the tail, and welding by an automatic seam welder;
s2, weighing 15-25 parts of sodium hyaluronate and 130-140 parts of deionized water according to a proportion, adding the sodium hyaluronate into a glass container, stirring at room temperature to completely dissolve the sodium hyaluronate, adjusting the pH value of the solution to be 5-6, then adding 2-3 parts of gallium chloride and 15-25 parts of sodium silicate, stirring at room temperature at the rotation speed of 600-650r/min for 3-5h to prepare degreasing fluid, and then sequentially immersing the cold-rolled hard steel coil treated by S1 into the degreasing fluid, scrubbing by using a brush roll, drying by hot air, and looping by an inlet to obtain a degreased cold-rolled hard steel coil;
s3, annealing the degreased cold-rolled hard steel coil obtained in the S2 to obtain an annealed steel coil;
s4, placing the annealed steel coil into a zinc pot, wherein the temperature of zinc liquid is 455-460 ℃, the soaking time of the annealed steel coil is 4-5S, and then sequentially carrying out air knife blowing, cooling, hot air drying and four-roller wet finishing machine finishing to obtain a galvanized steel coil; wherein, in the air knife blowing process, the flow of the air knife is 540-550L/min;
s5, placing the galvanized steel coil obtained in the step S4 in an oven at 45 ℃ to heat for 25-30min, taking out the galvanized steel coil and fixing the galvanized steel coil on a glass plate, sucking the passivation liquid by using a suction pipe and dropping the passivation liquid on the edge of the galvanized steel coil, uniformly coating the passivation liquid on the surface of the galvanized steel coil by using a stick wrapping cotton cloth, immediately placing the galvanized steel coil in an oven at 125 ℃ to bake for 85-90S, and standing for 12 h;
s6, carrying out fingerprint-resistant coating treatment on the galvanized steel coil subjected to the treatment of S5, and carrying out oiling treatment by using an electrostatic oiling machine after passing through an outlet loop to obtain an oiled galvanized steel coil;
s7, cutting, curling, coil unloading and packaging the oil-coated galvanized steel coil obtained in the step S6;
in the step S1, the cold-rolled hard steel coil comprises 0.025-0.035wt% of carbon, 0.004-0.008wt% of silicon, 0.16-0.20wt% of manganese, 0.001-0.020wt% of phosphorus, 0.005-0.015wt% of sulfur, 0.025-0.040wt% of aluminum, and 0.005-0.015wt% of molybdenum;
in the step S2, the degreasing fluid further includes 3 to 7 parts by weight of sodium stearate;
in the step S4, the zinc liquid comprises 0.06-0.1wt% of aluminum; in the step S4, the air knife blowing speed is 490-500 mm/S;
in the step S5, the passivation solution specifically includes the following components in parts by weight: 15-25 parts of 20-30g/L iron phosphate solution and 10-20 parts of 15-20g/L manganese phosphate solution;
in the step S2, the linear speed before the inlet loop is 90-100 m/min.
2. The process for producing a galvanized steel coil according to claim 1, characterized in that: in the step S1, the thickness of the cold-rolled hard steel coil is 0.4 to 0.8 mm.
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