CN113025935A - Hot-dip galvanized aluminum-magnesium alloy coated steel wire for bridge cable and preparation method thereof - Google Patents
Hot-dip galvanized aluminum-magnesium alloy coated steel wire for bridge cable and preparation method thereof Download PDFInfo
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- CN113025935A CN113025935A CN202010641140.2A CN202010641140A CN113025935A CN 113025935 A CN113025935 A CN 113025935A CN 202010641140 A CN202010641140 A CN 202010641140A CN 113025935 A CN113025935 A CN 113025935A
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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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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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
- C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
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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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a hot galvanizing aluminum magnesium alloy coating steel wire for a bridge cable and a preparation method thereof, wherein a zinc aluminum magnesium alloy coating is hot-galvanized on the outer side of a steel wire body of the steel wire, the thickness of the zinc aluminum magnesium alloy coating is more than 20 mu m, and the components of the zinc aluminum magnesium alloy coating comprise 0.6-3.2% of magnesium, 4.2-11% of aluminum and the balance of zinc and inevitable impurities; and a zinc-iron-aluminum-magnesium alloy transition layer with the thickness not more than 5um is arranged between the steel wire body and the zinc-aluminum-magnesium alloy coating. In the invention, the steel wire with a clean surface is heated to 390-450 ℃ under the non-oxidation condition, the temperature of the steel wire is 390-450 ℃, the steel wire is immersed into the molten zinc-aluminum-magnesium alloy plating solution at 390-450 ℃, the hot dip plating process can be completed only within 3-15s, the retention time of the steel wire in the molten zinc-aluminum-magnesium alloy plating solution is short, and the iron element on the surface of the steel wire does not have enough time to be greatly diffused into the zinc-aluminum-magnesium alloy plating layer so as to form the zinc-aluminum-magnesium alloy transition layer with the thickness of more than 5 um.
Description
Technical Field
The invention belongs to the field of manufacturing of hot-dip galvanized multi-element alloy steel wires, and particularly relates to a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable and a preparation method thereof.
Background
The prior steel material anticorrosion technology comprises methods such as electroplating, hot dip plating, hot spray coating, spray painting and the like, and the hot dip plating is the most widely applied and optimal steel surface treatment anticorrosion method in the world at present. With the development of science and technology, a series of innovations are made on the hot dip coating anticorrosion technology of steel.
The hot dip coating technology for the steel wire surface coating for the bridge cable comprises hot dip pure zinc and hot dip zinc-based multi-element alloy. The zinc-based multi-element alloy comprises zinc-aluminum alloy, zinc-aluminum-magnesium-silicon alloy, zinc-aluminum alloy added rare earth elements, zinc-aluminum-magnesium alloy added rare earth elements and the like. Wherein hot dip galvanizing is firstly appeared in France and is used for industrial production in 1836, and the hot dip galvanizing process is to treat the surface of a steel wire by a plating assistant agent and then carry out hot galvanizing; in 1980, Galfan (Zn-5% Al) coating is successfully developed, and the corrosion resistance of the hot-dip galvanized aluminum coating steel wire is improved by 2-6 times compared with the corrosion resistance of the hot-dip galvanized steel wire. The hot-dip coating process is to treat the surface of the steel wire by the plating assistant agent and then hot-dip coat the aluminum alloy, or hot-dip coat the pure zinc and then hot-dip coat the zinc alloy. In the last 90 th century, Nippon iron company successfully developed a zinc-aluminum-magnesium alloy coating product with the trade name of "ZAM", and the corrosion resistance of the coating is much higher than that of a zinc-aluminum coating. In an accelerated corrosion test, the corrosion resistance of ZAM is 10-20 times that of a pure zinc-plated steel plate and 5-8 times that of a Zn-5% Al alloy zinc-plated steel plate. The method for plating the aluminum-magnesium alloy layer by hot galvanizing that has been disclosed at present comprises the steps of firstly processing the surface of a steel wire by a plating assistant agent and then hot galvanizing the aluminum-magnesium alloy; or hot-dip galvanizing pure zinc firstly and then hot-dip galvanizing aluminum magnesium alloy. The surface of the steel plate is processed into sponge iron in an annealing furnace, and then the zinc-aluminum-magnesium alloy is hot dip-plated. Because the strength of the steel wire of the bridge cable comes from the drawing and hardening of the steel wire, the strength of the steel wire can be greatly reduced by the annealing furnace process, so the hot-dip zinc-aluminum-magnesium alloy coating process of the steel plate is not suitable for producing the zinc-aluminum-magnesium alloy coating steel wire for the bridge cable. At present, the plating assistant agent is also needed for hot galvanizing or zinc-based multi-element alloy. The use of the plating assistant agent before hot dipping can generate a large amount of pungent smoke during galvanizing, pollute the environment, and simultaneously can generate zinc slag in molten plating solution to pollute the plating solution. And at present, the plating assistant agent can be directly used for the hot plating pretreatment of the zinc-aluminum-magnesium, and no example of industrial production exists.
The international and domestic zinc-aluminum-magnesium alloy coating research focuses on low-silicon steel plates at present, and high-strength bridge cable steel wires all adopt high-carbon high-silicon wire rods. The silicon content in steel has a significant influence on the hot galvanizing reaction, namely the Sandelin effect. Due to the sandein effect, the iron-zinc reaction is accelerated during hot dip coating, the thickness of the zinc-iron-aluminum-magnesium alloy transition layer is larger than 5um, as shown in fig. 1, a steel substrate 1, a zinc-iron-aluminum-magnesium alloy transition layer 2 and a zinc-aluminum-magnesium alloy coating layer 3 are provided. The zinc-iron-aluminum-magnesium transition layer with the iron element mass percent of more than 10% is a brittle phase, and when the thickness is more than 5 mu m, the coating is very easy to be brittle and fall off. In the product detection of the steel wire for the bridge cable, after 200 ten thousand times of tensile pulse fatigue tests, the zinc-iron-aluminum-magnesium transition layer with the thickness of more than 5um can be seen to have the microcracks 4, as shown in the attached figure 2. The thickness of the zinc-iron-aluminum-magnesium alloy transition layer in the zinc-aluminum-magnesium alloy coating steel wire for the bridge cable at present is more than 5 um.
Disclosure of Invention
The invention aims to provide a quick preparation method of a hot-dip galvanized aluminum-magnesium alloy coating without a plating assistant, aiming at the problems that the prior hot-dip galvanized aluminum-magnesium steel wire coating for a bridge cable and a zinc-iron-aluminum-magnesium transition layer between a steel wire substrate interface have insufficient plasticity and the prior hot-dip galvanized aluminum-magnesium process needs the plating assistant to cause environmental pollution and plating solution pollution, the method can obtain the zinc-iron-aluminum-magnesium alloy transition layer with the thickness not more than 5 mu m and the average iron content lower than 8 percent, and further prepare the zinc-aluminum-magnesium alloy coated steel wire for the bridge cable with good coating plasticity.
In order to solve the above technical problems, an embodiment of the present invention provides a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable, wherein a zinc-aluminum-magnesium alloy coating is hot-dipped on an outer side of a steel wire body of the steel wire, a thickness of the zinc-aluminum-magnesium alloy coating is greater than 20 μm, and the zinc-aluminum-magnesium alloy coating comprises, by weight, 0.6% to 3.2% of magnesium, 4.2% to 11% of aluminum, and the balance zinc and inevitable impurities;
and a zinc-iron-aluminum-magnesium alloy transition layer with the thickness not more than 5um is arranged between the steel wire body and the zinc-aluminum-magnesium alloy coating.
The invention also provides a preparation method of the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable, which comprises the following steps:
(1) carrying out alkali washing degreasing on the surface of the high-strength steel wire for the bridge cable produced by drawing the wire rod, wherein the heating temperature of the alkali washing is 80-90 ℃, and removing the drawing soap powder on the surface of the steel wire;
(2) performing surface treatment on the steel wire subjected to alkaline cleaning and degreasing to remove impurities on the surface of the steel wire, including a phosphating film and iron oxide, from leaking out of a steel wire substrate;
(3) cleaning and drying the surface of the steel wire matrix;
(4) heating the steel wire to 390-450 ℃ under the non-oxidation protective atmosphere;
(5) preheating a zinc-aluminum-magnesium alloy to 390-450 ℃ to prepare molten zinc-aluminum-magnesium alloy liquid, and then soaking the steel wire heated to 390-450 ℃ in the step (4) into the molten zinc-aluminum-magnesium alloy liquid for hot dip coating, wherein the hot dip coating time is 3-15s according to the diameter of the steel wire;
(6) and cooling the steel wire subjected to hot galvanizing aluminum-magnesium alloy to solidify a coating, and controlling the cooling time to be 1-10s according to the performance requirement of the coating to obtain the zinc-aluminum-magnesium alloy coated steel wire with excellent toughness and corrosion resistance for the bridge cable.
In the step (2), the steel wire is subjected to surface treatment by adopting any one or any combination of acid washing, ultrasonic alkali washing, shot blasting, abrasive belts and grinding wheels.
Wherein, in the step (4), nitrogen or argon is adopted as protective atmosphere for preventing the steel wire from being oxidized; heating the steel wire to 390-450 ℃ by adopting an electromagnetic induction heating pipe.
And (6) performing controlled cooling for coating solidification by using any combination of two or three of air cooling, water mist and water spray cooling.
The technical scheme of the invention has the following beneficial effects:
1. in the invention, the steel wire with clean surface is heated to 390-450 ℃ under the condition of no oxidation. Because the surface of the steel wire has no oxide layer and other impurities, the zinc-aluminum-magnesium alloy coating can be directly hot-plated under the condition that the surface temperature of the steel wire is equivalent to the temperature of the molten zinc-aluminum-magnesium alloy, and the bonding force between the steel wire and the coating is good.
2. In the invention, the steel wire is immersed into the molten zinc-aluminum-magnesium alloy plating solution at the temperature of 390-450 ℃ and can complete the hot dipping process within 3-15 s. Compared with the prior 40-60s hot galvanizing reheating zinc-aluminum-magnesium alloy process, the residence time of the steel wire in the molten zinc-aluminum-magnesium alloy plating solution is short, and the iron element on the surface of the steel wire does not have enough time to be diffused into the zinc-aluminum-magnesium alloy plating layer in a large amount so as to form a zinc-iron-aluminum-magnesium alloy transition layer with the thickness of more than 5 um. Due to the control and reduction of the thickness and the average iron content of the transition layer, the plasticity of the coating is improved, and the coating of the steel wire for the bridge cable has no microcrack in a 200-ten-thousand stretching pulse experiment.
3. In the invention, the electromagnetic induction heating can heat the steel wire to 390-450 ℃ within 10s, and the hot dipping time is 3-15s, the time of the steel wire in the annealing state is less than 25s and is lower than the shortest hot dipping process time of 40s at present. By using the method of the invention, the strength loss of the steel wire is lower than that of the prior art, and the method is more suitable for manufacturing the steel wire for the high-strength bridge cable.
Drawings
FIG. 1 is an electron microscope image of a Zn-Fe-Al-Mg alloy transition layer with a thickness of more than 5um after hot dip coating of a high-strength bridge cable wire in the background art of the invention;
FIG. 2 is a schematic view showing the occurrence of microcracks in the zinc-iron-aluminum-magnesium transition layer with a thickness greater than 5um in the background art of the present invention;
fig. 3 is a scanning electron microscope image of a coating layer of a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable according to an embodiment of the invention;
FIG. 4 is a scanning electron microscope image of a coating layer of a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable according to a second embodiment of the present invention;
fig. 5 is a scanning electron microscope image of a coating layer of a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable according to a third embodiment of the present invention.
Description of reference numerals:
1. a steel substrate; 2. a zinc-iron-aluminum-magnesium alloy transition layer; 3. a zinc-aluminum-magnesium alloy plating layer; 4. cracking; 1-1, a steel substrate; 1-2, a zinc-iron-aluminum-magnesium alloy transition layer; 1-3, zinc-aluminum-magnesium alloy plating; 2-1, a steel substrate; 2-2, a zinc-iron-aluminum-magnesium alloy transition layer; 2-3, zinc-aluminum-magnesium alloy plating; 3-1, steel base body; 3-2, a zinc-iron-aluminum-magnesium alloy transition layer; 3-3, zinc-aluminum-magnesium alloy plating.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
In the invention, the detection and judgment of the zinc-aluminum-magnesium coating steel wire for the bridge cable adopt the following method:
a. measuring the content of silicon element in the steel wire: a GB/T223 steel and alloy chemical analysis method or a GB/T20125-2006 low alloy steel multi-element content determination inductively coupled plasma atomic emission spectrometry is adopted;
b. observation of the zinc-aluminum-magnesium alloy coating: and (3) observing the steel wire and the surface coating thereof which are made into a metallographic sample by using a back scattering electron probe of a scanning electron microscope, and analyzing and measuring the thickness of the zinc-iron-aluminum-magnesium alloy transition layer.
The technical scheme of the invention is further illustrated by the following specific examples.
Example 1
The high-strength steel wire for the bridge cable, which is produced by drawing the steel grade B90Si wire rod, has the diameter of 6 mm. The continuous production is carried out on a hot-dip production line at the speed of 18 m/min.
1.1, carrying out alkali washing degreasing on the steel wire, and removing the drawing soap powder on the surface of the steel wire. Heating the alkaline washing at about 80-90 ℃;
1.2, carrying out wet shot blasting on the steel wire for 2 times, and removing a drawing phosphating film on the surface of the steel wire;
1.3, washing the steel wire with water, and then drying the steel wire with hot air;
1.4, putting the steel wire into an electromagnetic induction heating pipe filled with nitrogen, and heating to 430 ℃ within 6 seconds;
1.5 the steel wire is immersed in a zinc-aluminum-magnesium alloy plating solution at 430 ℃ through a nitrogen protection tube. The zinc-aluminum-magnesium alloy plating solution contains 4.5 percent of aluminum, 0.7 percent of magnesium and the balance of zinc. After the steel wire is hot dipped for 6 seconds, zinc-aluminum-magnesium alloy plating solution is discharged;
1.6, vertically upwards dipping a steel wire of the hot galvanizing aluminum-magnesium alloy, controlling the thickness of a steel wire coating to be 51um by electromagnetic wiping, cooling the steel wire and the coating by water spraying, cooling the steel wire and the coating to 200 ℃, immersing the steel wire and the coating in a water tank to cool the steel wire and the coating to 80 ℃, naturally cooling, drying, taking up wires, and obtaining the coating microstructure of columnar crystals, wherein the solidification and cooling speed of the coating is high.
The scanning electron microscope photo of the coating of the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable obtained in the embodiment is shown in fig. 3, and the model of the scanning electron microscope is philips Quanta 400. The thickness of the Zn-Fe-Al-Mg alloy transition layer is measured to be 2.5um, and no microcrack appears on the coating in a 200-ten-thousand stretching pulse experiment.
Example 2
The high-strength steel wire for the bridge cable, which is produced by drawing the steel grade B90Si wire rod, has the diameter of 7 mm. The continuous production is carried out on a hot-dip production line at the speed of 12 m/min.
2.1, carrying out alkali washing degreasing on the steel wire, and removing the drawing soap powder on the surface of the steel wire. Heating the alkaline washing at about 80-90 ℃;
2.2, carrying out hydrochloric acid pickling on the steel wire, and removing an oxide skin and a drawing phosphating film on the surface of the degreased steel wire by hydrochloric acid with the concentration of 16 wt% and the temperature of 65 ℃;
2.3, washing the steel wire with water, and then drying the steel wire with hot air;
2.4, the steel wire enters an electromagnetic induction heating pipe which is filled with nitrogen, and is heated to 450 ℃ within 10 seconds;
2.5, the steel wire is immersed into the zinc-aluminum-magnesium alloy plating solution at the temperature of 430 ℃ through an argon protection tube. In the zinc-aluminum-magnesium alloy plating solution, the aluminum content is 7 percent, the magnesium content is 1.5 percent, and the balance is zinc. After the steel wire is hot dipped for 15 seconds, zinc-aluminum-magnesium alloy plating solution is discharged;
2.6, vertically upwards dipping a steel wire of the hot-dip galvanized aluminum-magnesium alloy, controlling the thickness of a steel wire coating to be 40um by electromagnetic wiping, cooling by water mist, reducing the temperature of the steel wire and the coating to 200 ℃, then immersing the steel wire and the coating in a water tank to cool to 80 ℃, and obtaining a coating microstructure of blocky crystals at a low solidification cooling speed, wherein the lower the cooling speed, the larger the size of the blocky crystals, and finally naturally cooling, drying and taking up the steel wire.
The scanning electron microscope photo of the coating of the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable obtained in the embodiment is shown in fig. 4, and the model of the scanning electron microscope is philips Quanta 400. The thickness of the Zn-Fe-Al-Mg alloy transition layer is measured to be 4.0um, and no microcrack appears on the coating in a 200-ten-thousand stretching pulse experiment.
Example 3
The high-strength steel wire for the bridge cable, which is produced by drawing the steel grade B90Si wire rod, has the diameter of 5.5 mm. Except abrasive belt polishing, the other steps are continuously produced on a hot-dip coating production line at the speed of 20 m/min.
3.1, carrying out alkali washing degreasing on the steel wire, and removing the drawing soap powder on the surface of the steel wire. Heating the alkaline washing at about 80-90 ℃;
3.2, performing abrasive belt polishing treatment on the steel wire, performing 4 times of abrasive belt treatment, and removing an oxide skin and a drawing phosphating film on the surface of the degreased steel wire;
3.3, washing the steel wire with water, and then drying the steel wire with hot air;
3.4, putting the steel wire into an electromagnetic induction heating pipe filled with nitrogen, and heating to 395 ℃ within 4 seconds;
3.5, the steel wire is immersed into the zinc-aluminum-magnesium alloy plating solution at the temperature of 400 ℃ through a nitrogen protection tube. In the zinc-aluminum-magnesium alloy plating solution, the aluminum content is 11 percent, the magnesium content is 3.2 percent, and the balance is zinc. After the steel wire is subjected to hot dip coating for 12 seconds, zinc-aluminum-magnesium alloy plating solution is obtained;
3.6, the steel wire of the hot galvanizing aluminum-magnesium alloy is vertically upward, the thickness of a steel wire coating is controlled to be 30um through electromagnetic wiping, then water mist and air are used for cooling, the temperature of the steel wire and the coating is reduced to 200 ℃, then the steel wire and the coating are immersed in a water tank to be cooled to 80 ℃, and finally natural cooling drying and wire take-up are carried out.
The scanning electron microscope photo of the coating of the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable obtained in the embodiment is shown in fig. 5, and the model of the scanning electron microscope is philips Quanta 400. The thickness of the Zn-Fe-Al-Mg alloy transition layer is measured to be 3.2um, and no microcrack appears on the coating in a 200-ten-thousand stretching pulse experiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A hot-dip galvanized aluminum-magnesium alloy coating steel wire for a bridge cable is characterized in that a zinc-aluminum-magnesium alloy coating is hot-dipped on the outer side of a steel wire body of the steel wire, the thickness of the zinc-aluminum-magnesium alloy coating is more than 20 mu m, and the components of the zinc-aluminum-magnesium alloy coating comprise 0.6-3.2% of magnesium, 4.2-11% of aluminum and the balance of zinc and inevitable impurities;
and a zinc-iron-aluminum-magnesium alloy transition layer with the thickness not more than 5um is arranged between the steel wire body and the zinc-aluminum-magnesium alloy coating.
2. A preparation method of a hot-dip galvanized aluminum-magnesium alloy coated steel wire for a bridge cable is characterized by comprising the following steps:
(1) carrying out alkali washing degreasing on the surface of the high-strength steel wire for the bridge cable produced by drawing the wire rod, wherein the heating temperature of the alkali washing is 80-90 ℃, and removing the drawing soap powder on the surface of the steel wire;
(2) performing surface treatment on the steel wire subjected to alkaline cleaning and degreasing to remove impurities on the surface of the steel wire, including a phosphating film and iron oxide, from leaking out of a steel wire substrate;
(3) cleaning and drying the surface of the steel wire matrix;
(4) heating the steel wire to 390-450 ℃ under the non-oxidation protective atmosphere;
(5) preheating zinc-aluminum-magnesium alloy to 390-450 ℃ to prepare molten zinc-aluminum-magnesium alloy liquid, and then immersing the steel wire heated to 390-450 ℃ in the step (4) into the molten zinc-aluminum-magnesium alloy liquid for hot dip coating, wherein the hot dip coating time is 3-15s according to the diameter of the steel wire;
(6) and cooling the steel wire subjected to hot galvanizing aluminum-magnesium alloy to solidify a coating, and controlling the cooling time to be 1-10s according to the performance requirement of the coating to obtain the zinc-aluminum-magnesium alloy coated steel wire with excellent toughness and corrosion resistance for the bridge cable.
3. The method for preparing the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable according to claim 2, wherein in the step (2), the steel wire is subjected to surface treatment by adopting any one or any combination of acid washing, ultrasonic alkali washing, shot blasting, abrasive belt and grinding wheel.
4. The method for preparing the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable according to claim 2, wherein in the step (4), nitrogen or argon is used as a protective atmosphere for preventing the steel wire from being oxidized; heating the steel wire to 390-450 ℃ by adopting an electromagnetic induction heating pipe.
5. The method for preparing the hot-dip galvanized aluminum-magnesium alloy coated steel wire for the bridge cable according to claim 2, wherein in the step (6), a controlled cooling mode of coating solidification is adopted by any combination of two or three of air cooling, water mist cooling and water spray cooling.
Priority Applications (1)
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1362997A (en) * | 2000-02-29 | 2002-08-07 | 新日本制铁株式会社 | Plated steel product having high resistance and excellent formability and method for production thereof |
| US20030003321A1 (en) * | 2000-02-29 | 2003-01-02 | Satoshi Sugimaru | Plated steel product having high corrosion resistance and excellent formability and method for production thereof |
| JP2003328101A (en) * | 2002-05-16 | 2003-11-19 | Nippon Steel Corp | Hot dip coated steel wire and production method thereof |
| DE60029428D1 (en) * | 1999-10-25 | 2006-08-31 | Nippon Steel Corp | METAL-COATED STEEL WIRE WITH EXCELLENT CORROSION RESISTANCE AND PROCESSABILITY AND MANUFACTURING METHOD |
| CN101027421A (en) * | 2004-06-29 | 2007-08-29 | 克里斯塔尔公司 | Steel sheet with hot dip galvanized zinc alloy coating and process to produce it |
| JP2011214145A (en) * | 2010-03-17 | 2011-10-27 | Nippon Steel Corp | Plated steel material and steel pipe having high corrosion resistance and excellent workability, and method for producing the same |
| US20190368007A1 (en) * | 2017-01-16 | 2019-12-05 | Nippon Steel Corporation | Coated steel product |
-
2020
- 2020-07-06 CN CN202010641140.2A patent/CN113025935B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60029428D1 (en) * | 1999-10-25 | 2006-08-31 | Nippon Steel Corp | METAL-COATED STEEL WIRE WITH EXCELLENT CORROSION RESISTANCE AND PROCESSABILITY AND MANUFACTURING METHOD |
| CN1362997A (en) * | 2000-02-29 | 2002-08-07 | 新日本制铁株式会社 | Plated steel product having high resistance and excellent formability and method for production thereof |
| US20030003321A1 (en) * | 2000-02-29 | 2003-01-02 | Satoshi Sugimaru | Plated steel product having high corrosion resistance and excellent formability and method for production thereof |
| JP2003328101A (en) * | 2002-05-16 | 2003-11-19 | Nippon Steel Corp | Hot dip coated steel wire and production method thereof |
| CN101027421A (en) * | 2004-06-29 | 2007-08-29 | 克里斯塔尔公司 | Steel sheet with hot dip galvanized zinc alloy coating and process to produce it |
| JP2011214145A (en) * | 2010-03-17 | 2011-10-27 | Nippon Steel Corp | Plated steel material and steel pipe having high corrosion resistance and excellent workability, and method for producing the same |
| US20190368007A1 (en) * | 2017-01-16 | 2019-12-05 | Nippon Steel Corporation | Coated steel product |
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