CN111270183B - Aluminum-zinc-magnesium coated steel plate adopting online switching method and preparation method thereof - Google Patents
Aluminum-zinc-magnesium coated steel plate adopting online switching method and preparation method thereof Download PDFInfo
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- CN111270183B CN111270183B CN202010203174.3A CN202010203174A CN111270183B CN 111270183 B CN111270183 B CN 111270183B CN 202010203174 A CN202010203174 A CN 202010203174A CN 111270183 B CN111270183 B CN 111270183B
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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
- C23C2/12—Aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc 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
- C23C2/14—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
- C23C2/34—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
- C23C2/40—Plates; Strips
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Abstract
The invention relates to the technical field of hot dipping, in particular to an aluminum-zinc-magnesium coating steel plate adopting an online switching method and a preparation method thereof, wherein the aluminum-zinc-magnesium coating steel plate adopting the online switching method comprises a steel plate base material and an aluminum-zinc-magnesium coating positioned on the surface of the steel plate base material, and is characterized in that the aluminum-zinc-magnesium coating comprises the following components in percentage by mass: 51-55% of Al, 1.0-1.2% of Mg, less than or equal to 0.2% of Si, 0.02-0.05% of Re, and the balance of zinc and other inevitable impurities; the preparation method comprises the following steps: adjusting the components of the zinc liquid in the main pot to obtain an aluminum-zinc-magnesium plating solution; placing a strip steel substrate in the aluminum-zinc-magnesium plating solution in the main boiler for hot plating to obtain the aluminum-zinc-magnesium plated steel plate; on the basis of the aluminum-zinc plating solution, the components of the plating solution in the main pot are switched on line and relevant process parameters are adjusted, the step of extracting the zinc solution from the main pot is reduced, the obtained aluminum-zinc-magnesium plated steel plate has high corrosion resistance, the bonding strength of the plated layer and a steel plate base material is high, the plated layer is not easy to peel off, and the aluminum-zinc-magnesium plated steel plate is suitable for severe working environments.
Description
Technical Field
The invention belongs to the technical field of hot dipping, and particularly relates to a preparation method of an aluminum-zinc-magnesium coated steel plate by an online switching method, and a product thereof.
Background
The aluminum-zinc-magnesium alloy coating steel plate is a new environment-friendly coating steel plate with great development prospect in the manufacturing industry, and compared with the traditional zinc plating and aluminum-zinc plating processes, the aluminum-zinc-magnesium alloy coating has excellent corrosion resistance and fine internal organization, is not easy to fall off, can adapt to extremely severe working environment, and is mainly applied to the fields of photovoltaic industry, high-speed rail, household appliance manufacturing, large-scale transformer substations and the like.
At present, only a few domestic enterprises are in the production of the aluminum-zinc-magnesium steel plate, most of the aluminum-zinc-magnesium steel plate is in the trial production stage, and mass production is not available. However, the surface spangles of the existing aluminum-zinc-magnesium steel plate are uneven, the corrosion resistance can not meet the strength requirement, the bonding strength of the coating and the base material is too low and is easy to fall off, and the industrial requirement can not be met.
Disclosure of Invention
In view of the above problems, the present invention provides an aluminum-zinc-magnesium coated steel sheet by an on-line switching method and a method for manufacturing the same. On the basis of the aluminum-zinc plating solution, the components of the plating solution in the main pot are switched on line and relevant technological parameters are adjusted. The method for adjusting the components of the plating solution by the non-stop online switching method is used for preparing the aluminum-zinc-magnesium plated steel plate, so that the step of extracting the zinc solution from the main pot is reduced, the corrosion resistance of the obtained aluminum-zinc-magnesium plated steel plate is 2-3 times higher than that of the common aluminum-zinc plated steel plate, and the aluminum-zinc-magnesium plated steel plate has high bonding strength with a steel plate base material, is not easy to peel and can adapt to severe working environments.
The technical scheme for realizing the purpose is as follows:
the invention provides an aluminum-zinc-magnesium coating steel plate adopting an online switching method, which comprises the following steps: the aluminum-zinc-magnesium-based composite plate comprises a steel plate base material and an aluminum-zinc-magnesium coating positioned on the surface of the steel plate base material, and is characterized in that the aluminum-zinc-magnesium coating comprises the following components in percentage by mass: 51 to 55 percent of Al, 1.0 to 1.2 percent of Mg, less than or equal to 0.2 percent of Si, 0.02 to 0.05 percent of Re, and the balance of zinc and other inevitable impurities.
In one embodiment, in the on-line switching method al-zn-mg coated steel sheet according to the present invention, the al-zn-mg coating layer includes, by mass: 51-53% of Al, 1.0-1.1% of Mg, less than or equal to 0.2% of Si, 0.02-0.05% of Re, and the balance of zinc and other inevitable impurities;
preferably, the aluminum-zinc-magnesium coating comprises the following components in percentage by mass: 52 percent of Al, 1.1 percent of Mg, less than or equal to 0.1 percent of Si, 0.04 percent of Re, and the balance of zinc and other inevitable impurities.
The steel plate obtained from the alloy components in the aluminum-zinc-magnesium coating steel plate has good surface quality, and the coating liquid is not easy to slag, thereby being beneficial to reducing the cost.
The invention also provides a preparation method of the aluminum-zinc-magnesium coating steel plate by the online switching method, which comprises the following steps: adjusting the components of the zinc liquid in the main pot to obtain an aluminum-zinc-magnesium plating solution; placing a strip steel substrate in the aluminum-zinc-magnesium plating solution in the main boiler for hot plating to obtain the aluminum-zinc-magnesium plated steel plate;
wherein, the aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 51-55% of Al, 1.0-1.2% of Mg, less than or equal to 0.2% of Si, 0.02-0.05% of Re, and the balance of zinc and other inevitable impurities;
preferably, the preparation method further comprises the step of sequentially carrying out water quenching tank treatment, finishing treatment, withdrawal and straightening treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate, wherein the passivation treatment is carried out by using a passivation solution (purchased from Shanghai Xingsel surface material Co., ltd.).
In one embodiment, in the method for manufacturing an on-line switching method aluminum-zinc-magnesium coated steel sheet according to the present invention, the aluminum-zinc-magnesium plating solution includes, by mass: 51-53% of Al, 1.0-1.1% of Mg, less than or equal to 0.2% of Si, 0.02-0.05% of Re, and the balance of zinc and other inevitable impurities;
preferably, the aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 52 percent of Al, 1.1 percent of Mg, less than or equal to 0.1 percent of Si, 0.04 percent of Re, and the balance of zinc and other inevitable impurities.
In one embodiment, in the method for preparing an aluminum-zinc-magnesium coated steel sheet by an online switching method according to the present invention, the adjusting of the zinc bath composition in the main pot to obtain an aluminum-zinc-magnesium plating bath includes: adding magnesium-containing alloy ingot A (purchased from Jingjiang shinkan alloy material Co., ltd.), magnesium-containing alloy ingot B (purchased from Jingjiang shinkan alloy material Co., ltd.) and aluminum zinc ingot (purchased from Jingjiang shinkan alloy material Co., ltd., the adding amount of the magnesium-containing alloy ingot A and the aluminum zinc ingot B is the content percentage of each component of the aluminum zinc magnesium plating solution in the main pot, and adjusting the components of the plating solution in the main pot to the aluminum zinc magnesium plating solution in the invention) into the zinc solution in a main pot to obtain an aluminum zinc magnesium plating solution through melting;
preferably, the main pot is communicated with a pre-melting pot (the pre-melting pot is used for supplementing plating solution to the main pot);
the method for adjusting the components of the zinc liquid in the main pot to obtain the aluminum-zinc-magnesium plating solution comprises the following steps: adding a magnesium-containing alloy ingot A into the zinc liquid in the main pot, and melting to obtain a mixed plating solution A; adding a magnesium-containing alloy ingot B and an aluminum-zinc ingot (the addition amount is that the content percentage of each component of the aluminum-zinc-magnesium plating solution in the main pot is adjusted) into the pre-melting pot (the pre-melting pot is communicated with the main pot and is used for supplementing the plating solution to the main pot), and melting to obtain a mixed plating solution B; uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain the aluminum-zinc-magnesium plating solution;
the preparation method of the aluminum-zinc-magnesium coated steel plate by the online switching method does not extract zinc liquid on the basis of the aluminum-zinc plating liquid, and directly and respectively adjusts the plating liquid in the pre-melting pot and the plating liquid in the main pot.
Preferably, the mass ratio of the zinc liquid to the magnesium-containing alloy ingot A is 90;
preferably, the mass ratio of the zinc liquid to the magnesium-containing alloy ingot B is 90;
preferably, the time for melting is 72 to 96 hours.
In one embodiment, in the method for preparing an aluminum-zinc-magnesium coated steel sheet by an online switching method according to the present invention, the zinc liquid in the main boiler comprises, by mass: 53-55% of Al, less than or equal to 0.2% of Si, and the balance of zinc and other inevitable impurities;
preferably, the magnesium-containing alloy ingot a includes, in mass percent: 14% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities;
preferably, the magnesium-containing alloy ingot B includes, in mass percent: 14% of Al, 3% of Mg, and the balance of Si, zn and other inevitable impurities.
In one embodiment, in the method for preparing an aluminum-zinc-magnesium coated steel sheet by an online switching method, the main boiler is connected with a heating furnace;
preferably, in the process of adjusting the components of the zinc liquid in the main pot, the temperature of the main pot is 593-597 ℃;
preferably, in the process of adding the magnesium-containing alloy ingot B and the aluminum-zinc ingot into the pre-melting pot, the temperature of the pre-melting pot is 593-597 ℃;
preferably, the strip steel substrate is subjected to degreasing cleaning and continuous annealing treatment;
preferably, in the process of placing the strip steel substrate in the aluminum-zinc-magnesium plating solution in the main pot for hot plating, the pot entering temperature of the strip steel substrate is 530-555 ℃;
preferably, in the process of placing the strip steel base material in the aluminum-zinc-magnesium plating solution in the main pot for hot plating, the temperature of the main pot is 590-595 ℃.
In one embodiment, in the method for preparing the aluminum-zinc-magnesium coated steel plate by the online switching method, the dew point in the furnace nose of the heating furnace is-40 ℃;
preferably, the oxygen content of the nose of the heating furnace is 6-10 ppm, preferably 8ppm.
Preferably, during the process of placing the strip steel substrate in the aluminum-zinc-magnesium plating solution in the main pot for hot plating, an air knife is used for blowing the plating layer;
preferably, the height of the air knife is 120 to 300mm;
preferably, the upper air knife angle of the air knife is-3.0 and the lower air knife angle of the air knife is-3.1;
preferably, the air pressure of the air knife is 100mba.
In one embodiment, in the method for preparing an aluminum-zinc-magnesium coated steel sheet by an online switching method according to the present invention, in the process of adjusting the zinc bath composition in the main pot, before obtaining the aluminum-zinc-magnesium coating bath, the strip steel substrate (as a transition material) is placed in the main pot for hot coating, so as to obtain a transition coated steel sheet (which meets the quality requirement and can be sold as a coated steel sheet).
According to the preparation method of the aluminum-zinc-magnesium coated steel plate by the online switching method, 5000 tons of cold-rolled strip steel can be used as a transition material to be placed in the main pot for hot plating in the process of adjusting the plating solution, and the product obtained by stabilizing the roll period of one sink roll meets the quality requirement and can be sold.
The invention also provides the aluminum-zinc-magnesium coated steel plate prepared by the preparation method of the aluminum-zinc-magnesium coated steel plate by the online switching method.
The components of the aluminum-zinc-magnesium coating are balanced, so that the slag formation amount of the coating is small, and the cost is reduced; the aluminum-zinc-magnesium coating steel plate has better surface quality.
In the preparation process of the aluminum-zinc-magnesium coating steel plate, each relevant process parameter is obtained by optimizing and balancing a large number of tests, so that the surface quality of the aluminum-zinc-magnesium coating is improved, the coating thickness of the surface of a steel substrate is controlled, and the generation of common defects is reduced.
The invention relates to a preparation method of an aluminum-zinc-magnesium coated steel plate, which is a zinc-magnesium coated steel plate obtained by aluminum through an online switching method on the basis of an aluminum-zinc plating solution. The components and related process parameters of the aluminum-zinc-magnesium plating solution are obtained through a large number of tests, so that resources are saved, more importantly, the zinc flowers on the surface of the prepared aluminum-zinc-magnesium plating steel plate are small in size and good in uniformity on the whole, the steel plate is high in corrosion resistance, and the plating layer is high in bonding strength with a steel plate base material and is not easy to fall off. According to the preparation method of the aluminum-zinc-magnesium coating steel plate, the link of zinc pumping is reduced, unnecessary danger and cost are avoided, and the yield and the production efficiency are greatly improved.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The experimental procedures in the following examples are all conventional ones unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
Example 1: preparation of the aluminum-zinc-magnesium coating steel plate
(1) Adding 2.2 tons of magnesium-containing alloy ingot A into 90 tons of zinc liquid in a main pot at 593 ℃ without stopping equipment, and melting for 72 hours to obtain mixed plating solution A; adding 55 tons of magnesium-containing alloy ingots B and aluminum-zinc ingots (the addition amount is the content percentage of the components of the plating solution of the main pot to be below) into a pre-melting pot (which is communicated with the main pot and used for supplementing the plating solution to the main pot) with the temperature of 593 ℃, and melting for 72 hours to obtain a mixed plating solution B; and uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain the aluminum-zinc-magnesium plating solution. Wherein, by mass percent, the zinc liquid comprises: al 53, si less than or equal to 0.2 percent, and the balance of zinc and other inevitable impurities. The aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 51 percent of Al, 1.0 percent of Mg, less than or equal to 0.2 percent of Si, 0.02 percent of Re, and the balance of zinc and other inevitable impurities. The magnesium-containing alloy ingot A comprises: 14% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities. The magnesium-containing alloy ingot B comprises: 14% of Al, 3% of Mg, and the balance of Si, zn and other inevitable impurities.
(2) Putting the band steel substrate subjected to degreasing cleaning and continuous annealing treatment into the aluminum-zinc-magnesium plating solution obtained in the main pot in the step (1) for hot plating, wherein the pot entering temperature of the band steel substrate is 530 ℃, and the temperature of the main pot is 590 ℃; the main pot is connected with a heating furnace, the dew point in the nose of the heating furnace is-40 ℃, the oxygen content is 6ppm, an air knife is used for sweeping the coating, the height of the air knife is 120mm, the angle of an upper air knife of the air knife is-3.0, the angle of a lower air knife of the air knife is-3.1, and the air pressure of the air knife is 100mba; and obtaining the aluminum-zinc-magnesium coated steel plate after hot dipping.
(3) In the process of adjusting the zinc liquid component in the main pot in the step (1), before the aluminum-zinc-magnesium plating solution is obtained, the strip steel substrate can be used as a transition material and placed in the main pot for hot plating to obtain a transition type plated steel plate which meets the quality requirement. In the process, 5000 tons of cold-rolled strip steel can be optimally arranged according to the arrangement rule of aluminum-zinc plated products, and the cold-rolled strip steel is placed in a main pot for hot dipping, so that the roll period of a sink roll is stabilized, and the obtained product can be sold.
(4) And (3) sequentially carrying out water quenching tank treatment, finishing treatment, withdrawal and straightening treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate in the step (2), wherein passivation solution (purchased from Shanghai Xingshell surface Material Co., ltd.) is adopted for carrying out passivation treatment, and coiling and packaging after the steel plate is qualified.
Example 2: preparation of the aluminum-zinc-magnesium coating steel plate
(1) Adding 2.2 tons of magnesium-containing alloy ingot A into 90 tons of zinc liquid in a main pot at 597 ℃ without stopping equipment, and melting for 96 hours to obtain mixed plating solution A; adding 55 tons of magnesium-containing alloy ingot B and an aluminum-zinc ingot (the addition amount is to adjust the plating solution to the component content of the aluminum-zinc-magnesium plating solution) into a premelting pot (which is communicated with a main pot and is used for supplementing the plating solution to the main pot) with the temperature of 597 ℃, and melting for 96 hours to obtain a mixed plating solution B; and uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain the aluminum-zinc-magnesium plating solution. Wherein, by mass percent, the zinc liquid comprises: al 55, si less than or equal to 0.2 percent, and the balance of zinc and other inevitable impurities. The aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 55 percent of Al, 1.2 percent of Mg, less than or equal to 0.2 percent of Si, 0.05 percent of Re, and the balance of zinc and other inevitable impurities. The magnesium-containing alloy ingot A comprises: 14% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities; the magnesium-containing alloy ingot B comprises: 14% of Al, 3% of Mg, and the balance of Si, zn and other inevitable impurities.
(2) Placing the strip steel substrate subjected to degreasing, cleaning and continuous annealing treatment in the aluminum-zinc-magnesium plating solution obtained in the main pot in the step (1) for hot plating, wherein the pot entry temperature of the strip steel substrate is 555 ℃ and the temperature of the main pot is 595 ℃; the main pot is connected with a heating furnace, the dew point in the nose of the heating furnace is-40 ℃, the oxygen content is 10ppm, an air knife is used for sweeping the coating, the height of the air knife is 300mm, the angle of an upper air knife of the air knife is-3.0, the angle of a lower air knife of the air knife is-3.1, and the air pressure of the air knife is 100mba; and obtaining the aluminum-zinc-magnesium coated steel plate after hot dipping.
(3) In the process of adjusting the zinc liquid component in the main pot in the step (1), before the aluminum-zinc-magnesium plating solution is obtained, the strip steel substrate can be used as a transition material and placed in the main pot for hot plating to obtain a transition type plated steel plate which meets the quality requirement. In the process, 5000 tons of cold-rolled strip steel can be subjected to optimized production scheduling according to the production scheduling rule of an aluminum-zinc plated product, and the cold-rolled strip steel is placed in a main pot for hot dipping, so that the rolling period of a sink roll is stabilized, and the obtained product can be sold.
(4) And (3) sequentially carrying out water quenching tank treatment, finishing treatment, straightening and withdrawal treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate in the step (2), wherein passivation solution (purchased from Shanghai Xingshi surface materials Co., ltd.) is adopted for carrying out the passivation treatment, and the aluminum-zinc-magnesium coated steel plate is coiled and packaged after being inspected to be qualified.
Example 3: preparation of the aluminum-zinc-magnesium coating steel plate
(1) The equipment is not stopped, 2.2 tons of magnesium-containing alloy ingot A are added into 90 tons of zinc liquid in a main pot at the temperature of 592 ℃, and the mixture is melted for 80 hours to obtain mixed plating solution A; adding 55 tons of magnesium-containing alloy ingot B and an aluminum-zinc ingot (the addition amount is the percentage of the components of the plating solution in the main pot to be adjusted to the following aluminum-zinc-magnesium plating solution) into a pre-melting pot (which is communicated with the main pot and is used for supplementing the plating solution to the main pot) at the temperature of 593 ℃, and melting for 72 hours to obtain a mixed plating solution B; and uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain the aluminum-zinc-magnesium plating solution. Wherein, by mass percent, the zinc liquid comprises: al 53 and Si less than or equal to 0.2 percent, and the balance of zinc and other inevitable impurities. The aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 52 percent of Al, 1.1 percent of Mg, less than or equal to 0.1 percent of Si, 0.04 percent of Re, and the balance of zinc and other inevitable impurities. The magnesium-containing alloy ingot A comprises the following components in percentage by mass: 14% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities; the magnesium-containing alloy ingot B comprises the following components in percentage by mass: 14% of Al, 3% of Mg, and the balance of Si, zn and other inevitable impurities.
(2) Placing the strip steel substrate subjected to degreasing, cleaning and continuous annealing treatment in the aluminum-zinc-magnesium plating solution obtained in the main pot in the step (1) for hot plating, wherein the pot entry temperature of the strip steel substrate is 530 ℃, and the temperature of the main pot is 590 ℃; the main pot is connected with a heating furnace, the dew point in the nose of the heating furnace is-40 ℃, the oxygen content is 8ppm, an air knife is used for sweeping the coating, the height of the air knife is 120mm, the angle of an upper air knife of the air knife is-3.0, the angle of a lower air knife of the air knife is-3.1, and the air pressure of the air knife is 100mba; and obtaining the aluminum-zinc-magnesium coated steel plate after hot dipping.
(3) In the process of adjusting the zinc liquid component in the main pot in the step (1), before the aluminum-zinc-magnesium plating solution is obtained, the strip steel substrate can be used as a transition material and placed in the main pot for hot plating to obtain a transition type plated steel plate which meets the quality requirement. In the process, 5000 tons of cold-rolled strip steel can be subjected to optimized production scheduling according to the production scheduling rule of an aluminum-zinc plated product, and the cold-rolled strip steel is placed in a main pot for hot dipping, so that the rolling period of a sink roll is stabilized, and the obtained product can be sold.
(4) And (3) sequentially carrying out water quenching tank treatment, finishing treatment, straightening and withdrawal treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate in the step (2), wherein passivation solution (purchased from Shanghai Xingshi surface materials Co., ltd.) is adopted for carrying out the passivation treatment, and the aluminum-zinc-magnesium coated steel plate is coiled and packaged after being inspected to be qualified.
Example 4: preparation of the aluminum-zinc-magnesium coating steel plate
(1) Adding 2.2 tons of magnesium-containing alloy ingot A into 90 tons of zinc liquid in a main pot at 592 ℃ without stopping the equipment, and melting for 80 hours to obtain mixed plating solution A; adding 55 tons of magnesium-containing alloy ingot B and an aluminum-zinc ingot (the addition amount is the percentage of the components of the plating solution in the main pot to be adjusted to the following aluminum-zinc-magnesium plating solution) into a pre-melting pot (which is communicated with the main pot and is used for supplementing the plating solution to the main pot) at the temperature of 593 ℃, and melting for 72 hours to obtain a mixed plating solution B; and uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain the aluminum-zinc-magnesium plating solution. Wherein, by mass percent, the zinc liquid comprises: al 53 and Si less than or equal to 0.2 percent, and the balance of zinc and other inevitable impurities. The aluminum-zinc-magnesium plating solution comprises the following components in percentage by mass: 53 percent of Al, 1.1 percent of Mg, less than or equal to 0.2 percent of Si, 0.04 percent of Re, and the balance of zinc and other inevitable impurities. The magnesium-containing alloy ingot A comprises the following components in percentage by mass: 14% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities; the magnesium-containing alloy ingot B comprises the following components in percentage by mass: 14% of Al, 3% of Mg, and the balance of Si, zn and other inevitable impurities.
(2) Placing the strip steel substrate subjected to degreasing, cleaning and continuous annealing treatment in the aluminum-zinc-magnesium plating solution obtained in the main pot in the step (1) for hot plating, wherein the pot entry temperature of the strip steel substrate is 530 ℃, and the temperature of the main pot is 590 ℃; the main pot is connected with a heating furnace, the dew point in the nose of the heating furnace is-40 ℃, the oxygen content is 8ppm, an air knife is used for sweeping the coating, the height of the air knife is 120mm, the angle of an upper air knife of the air knife is-3.0, the angle of a lower air knife of the air knife is-3.1, and the air pressure of the air knife is 100mba; and obtaining the aluminum-zinc-magnesium coated steel plate after hot dipping.
(3) In the process of adjusting the zinc liquid component in the main pot in the step (1), before the aluminum-zinc-magnesium plating solution is obtained, the strip steel substrate can be used as a transition material and placed in the main pot for hot plating to obtain a transition type plated steel plate which meets the quality requirement. In the process, 5000 tons of cold-rolled strip steel can be subjected to optimized production scheduling according to the production scheduling rule of an aluminum-zinc plated product, and the cold-rolled strip steel is placed in a main pot for hot dipping, so that the rolling period of a sink roll is stabilized, and the obtained product can be sold.
(4) And (3) sequentially carrying out water quenching tank treatment, finishing treatment, withdrawal and straightening treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate in the step (2), wherein passivation solution (purchased from Shanghai Xingshell surface Material Co., ltd.) is adopted for carrying out passivation treatment, and coiling and packaging after the steel plate is qualified.
Comparative example 1: preparation of aluminum-zinc-magnesium coated steel plate
(1) After the equipment is stopped, 21 tons of zinc liquid are extracted from the main pot and placed in the main pot, and the zinc extraction time is 20 hours; the zinc liquid comprises the following components in percentage by mass: 53 percent of Al, less than or equal to 0.2 percent of Si, and the balance of zinc and other inevitable impurities.
(2) Adding 21 tons of magnesium-containing alloy ingots into the zinc liquid extracted in the step (1), then adding the zinc ingots to obtain an aluminum-zinc-magnesium plating solution, melting for 24 hours at the temperature of 560 ℃ in a main pot, then stirring the zinc liquid by using a zinc liquid pump, standing for 24 hours, and removing floating slag to obtain a uniform aluminum-zinc-magnesium plating solution; wherein, by mass percent, the aluminum-zinc-magnesium plating solution comprises: 53 percent of Al, 1.47 percent of Mg, less than or equal to 0.3 percent of Si, 0.01 percent of Re, and the balance of zinc and other inevitable impurities.
The magnesium-containing alloy ingot comprises: 45% of Al, 7% of Mg, and the balance of Si, zn and other inevitable impurities.
(3) Starting a vehicle to prepare an aluminum-zinc-magnesium coating steel plate, and placing a cold-rolled strip steel base material into the aluminum-zinc-magnesium coating liquid in a main boiler for hot coating, wherein the boiler entering temperature of the strip steel base material is 520 ℃, and the temperature of the main boiler is 585 ℃; the main pot is connected with a heating furnace, the dew point in the nose of the heating furnace is-38 ℃, the oxygen content is 11ppm, an air knife is used for blowing and sweeping the coating, the height of the air knife is 110mm, the angle of an upper air knife of the air knife is-3.0, the angle of a lower air knife of the air knife is-3.0, and the air pressure of the air knife is 90mba; and obtaining the aluminum-zinc-magnesium coated steel plate after hot dipping.
The performance tests of corrosion resistance and bonding strength of the aluminum-zinc-magnesium coated steel sheets obtained in the above examples 1 to 4 and the comparative example 1 are respectively carried out, and the test results show that the corrosion resistance and the bonding strength of the aluminum-zinc-magnesium plated products obtained in the above examples 1 to 4 and the comparative example 1 are superior to those of the aluminum-zinc plated products. In addition, compared with the comparative example 1, the zinc pumping ring sections are reduced in the examples 1 to 4, 5000 tons of finished products are produced, and huge economic benefits are brought to enterprises.
In conclusion, the above description of the specific embodiments of the present invention does not limit the present invention, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which falls within the scope of the appended claims.
Claims (4)
1. A method for preparing an aluminum-zinc-magnesium coated steel plate by an online switching method comprises the following steps: the main pot is communicated with the premelting pot, the equipment is not stopped, magnesium-containing alloy ingots A are added into the zinc liquid in the main pot, and melting is carried out to obtain mixed plating liquid A; adding a magnesium-containing alloy ingot B and an aluminum-zinc ingot into the premelting pot, and melting for 72 to 96 hours to obtain a mixed plating solution B; uniformly mixing the mixed plating solution A and the mixed plating solution B to obtain an aluminum-zinc-magnesium plating solution; placing a strip steel substrate in the aluminum-zinc-magnesium plating solution for hot plating to obtain the aluminum-zinc-magnesium coated steel plate, sequentially performing water quenching tank treatment, finishing treatment, pulling and straightening treatment and passivation treatment on the aluminum-zinc-magnesium coated steel plate, and adding a magnesium-containing alloy ingot B and an aluminum-zinc ingot into the premelting pot at the temperature of 593-597 ℃; degreasing, cleaning and continuously annealing the strip steel substrate; putting a strip steel base material into the aluminum-zinc-magnesium plating solution in the main pot for hot plating, wherein the pot-entering temperature of the strip steel base material is 530-555 ℃; placing a strip steel substrate in the aluminum-zinc-magnesium plating solution in the main pot for hot plating, wherein the temperature of the main pot is 590-595 ℃;
wherein, by mass percent, the aluminum-zinc-magnesium plating solution comprises: 51-55% of Al, 1.0-1.2% of Mg, less than or equal to 0.2% of Si, 0.02-0.05% of RE and the balance of zinc and other inevitable impurities;
the main pot is connected with a heating furnace, and the temperature of the main pot is 593-597 ℃ and the dew point in the nose of the heating furnace is-40 ℃ in the process of adjusting the components of the zinc liquid in the main pot; the furnace nose oxygen content of heating furnace is 6 to 10ppm, arranges the belted steel substrate in the main pot carry out the in-process of hot dipping in the aluminium zinc magnesium plating solution, use the air knife to sweep the cladding material, the height of air knife is 120 to 300mm, the last air knife angle of air knife is-3.0, the lower air knife angle of air knife is-3.1, the wind pressure of air knife is 100mba, obtains before the aluminium zinc magnesium plating solution, will the belted steel substrate is arranged in carry out the hot dipping in the main pot, obtain transition type cladding material steel sheet.
2. The method for preparing an aluminum-zinc-magnesium coated steel sheet according to the on-line switching method of claim 1, wherein the aluminum-zinc-magnesium plating solution comprises, by mass: 51 to 53 percent of Al, 1.0 to 1.1 percent of Mg, less than or equal to 0.2 percent of Si, 0.02 to 0.05 percent of RE, and the balance of zinc and other inevitable impurities.
3. The method for preparing an aluminum-zinc-magnesium coated steel sheet according to the on-line switching method of claim 1, wherein the aluminum-zinc-magnesium plating solution comprises, by mass: 52 percent of Al, 1.1 percent of Mg, less than or equal to 0.1 percent of Si, 0.04 percent of RE, and the balance of zinc and other inevitable impurities.
4. The method of manufacturing an al-zn-mg coated steel sheet according to the on-line switching method of claim 1, wherein the oxygen content in the furnace nose of the heating furnace is 8ppm.
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