CN117904566A - Method for eliminating zinc fluctuation defect of magnesium zinc-aluminum-magnesium plating layer in aluminum in heat base - Google Patents

Method for eliminating zinc fluctuation defect of magnesium zinc-aluminum-magnesium plating layer in aluminum in heat base Download PDF

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Publication number
CN117904566A
CN117904566A CN202410025404.XA CN202410025404A CN117904566A CN 117904566 A CN117904566 A CN 117904566A CN 202410025404 A CN202410025404 A CN 202410025404A CN 117904566 A CN117904566 A CN 117904566A
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zinc
aluminum
magnesium
strip steel
temperature
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夏雪松
梁媛媛
范春磊
李贵明
张洪涛
宋仁伯
陈昊天
刘文栋
赵卫红
胡少梅
赵欣
宋跃军
刘润博
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University of Science and Technology Beijing USTB
HBIS Co Ltd Handan Branch
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University of Science and Technology Beijing USTB
HBIS Co Ltd Handan Branch
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Priority to CN202410025404.XA priority Critical patent/CN117904566A/en
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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
    • 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
    • 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
    • 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
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/522—Temperature of the bath
    • 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
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention provides a method for eliminating the zinc fluctuation defect of a magnesium zinc-aluminum-magnesium coating in aluminum in a heat base, and relates to the technical field of preparation of zinc-aluminum-magnesium coatings on the surface of steel rolling. The method comprises the following steps: acid washing the raw material strip steel twice to obtain acid-washed strip steel; the heating temperature of the straight flame section is reduced when the acid-washed strip steel is heated, so that the heated strip steel is obtained; controlling the power of a cooling fan to raise the surface temperature of the heated strip steel when the heated strip steel enters a zinc pot, so as to obtain temperature-controlled heated strip steel; immersing the temperature-controlled heating strip steel into a zinc pot to carry out hot dip plating on the zinc-aluminum-magnesium coating, thereby obtaining the zinc-aluminum-magnesium coating of the magnesium-aluminum in the heat base without zinc fluctuation on the surface. The invention can overcome the technical problem of 'zinc fluctuation' on the surface of the coating by twice acid washing, reducing the temperature of the direct flame section and improving the surface temperature of the strip steel when the strip steel enters a zinc pot, save energy and reduce consumption, shorten heating time, reduce the obstruction of strip steel core heat to the solidification process of the plating solution, improve the coating performance, and has simple whole process operation and is beneficial to industrial mass production and popularization and use.

Description

Method for eliminating zinc fluctuation defect of magnesium zinc-aluminum-magnesium plating layer in aluminum in heat base
Technical Field
The invention relates to the technical field of preparation of zinc-aluminum-magnesium plating layers on surfaces of steel rolling, in particular to a method for eliminating zinc fluctuation defects of a magnesium zinc-aluminum-magnesium plating layer in aluminum in a heat base.
Background
Along with the continuous improvement of the corrosion resistance requirement of the zinc-based plating product in the market, various iron and steel enterprises increase the development force of zinc-aluminum-magnesium plating products with better corrosion resistance and notch protection. The magnesium zinc aluminum magnesium plating product in aluminum in heat base has the advantages of short flow, low energy consumption, low cost and the like because of excellent corrosion resistance and omission of cold rolling, and is widely applied to the fields of photovoltaics, buildings and the like.
However, in actual production, zinc relief defects often appear on the surface of a magnesium zinc-aluminum-magnesium plating product of the aluminum in the heat base. The product aesthetic property is influenced, and the corrosion resistance of the product is greatly influenced, so that the application of the product in the field of high added value is seriously hindered.
There are few documents and patents related to the fluctuation defect of zinc on the surface of zinc-aluminum-magnesium coating, and related researches are mainly focused on pure zinc coating products.
For example: chinese patent CN116288098a discloses a method for coating a hot-base galvanized sheet, which eliminates the hot-base galvanized surface zinc relief defect by leveling the pickled sheet, and controlling the temperature of the zinc liquid and the air knife parameters. It can be seen that this patent focuses only on the problem of zinc waviness on the surface of the pure zinc coating. However, zinc-aluminum-magnesium plating is different from pure zinc plating, and the complex component system makes the plating solution possible to generate metal segregation in the dip plating and solidification process, so that the result is quite different from that of the pure zinc plating.
While China patent CN110273121A discloses A zinc-aluminum-magnesium coated steel strip and A preparation method thereof, si, cu, sn, re and other elements are added into the plating solution, the compactness, the wear resistance and the high temperature resistance of the coating are improved, but the steel strip needs to be rapidly cooled after hot dip plating, so the cost of the whole process is high, the energy consumption is large, and the fluctuation of zinc is not effectively solved.
Chinese patent CN111235509a discloses a method for eliminating zinc slag defect on the surface of zinc-aluminum-magnesium plating product, which needs to adopt small flow to control the mixed gas of humidified nitrogen and hydrogen, strictly controls the spray angle of humidified gas at the furnace nose through the optimal design of the injection point of the mixed gas of humidified nitrogen and hydrogen, and adopts a single-side overflow furnace nose to be matched with a zinc ash pump for use, although the defect of zinc slag on the surface can be removed, the fluctuation of zinc is not effectively solved.
Chinese patent CN113481455A discloses a method for producing high surface quality zinc-aluminum-magnesium coated steel strip/plate using air knives, which eliminates defects of zinc flow lines, horseshoe marks, etc. by controlling plating solution composition and temperature and reducing air knife-to-strip distance, air knife pressure and air knife height too much in hot dip plating process; however, when designing the air knife, various uneven phenomena of air flow are unavoidable, and serious uneven air flow causes 'zinc fluctuation' defect on the surface of the strip steel. Similarly, chinese patent CN112575273a discloses a medium-aluminum zinc-aluminum-magnesium plated steel sheet with excellent plating plasticity and a production method thereof, wherein an air knife is also used to control the thickness of the plating layer, and the defect of "zinc fluctuation" is also present.
Disclosure of Invention
The invention aims to solve the technical problems that in the hot dip plating process of the current zinc-aluminum-magnesium coated steel strip, an air knife mode is adopted for controlling the thickness of the coating, and the mode can lead to uneven air flow, thereby leading to the defect of 'zinc fluctuation' on the surface of the steel strip; or a plating solution component adding mode is adopted, which leads to complex plating solution components, further increases the cost and reduces the coating adhesive force; or the method of controlling the mixed gas of the humidified nitrogen and the hydrogen with small flow, controlling the spray angle of the humidified gas at the furnace nose and the like is adopted, so that the surface quality of a coating can be improved, but the operation process is complex, the operation difficulty is high, and the defect of 'zinc fluctuation' still exists on the surface of the strip steel.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: acid washing the raw material strip steel twice to obtain acid-washed strip steel;
s2, heating: reducing the heating temperature of the straight flame section when the S1 acid-washed strip steel is heated to obtain a heated strip steel;
s3, temperature control: controlling the power of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering a zinc pot, so as to obtain a temperature-controlled heating strip steel;
s4, hot dip plating: and (3) immersing the S3 temperature-controlled heating strip steel into a zinc pot to carry out hot dip plating on the zinc-aluminum-magnesium coating, thereby obtaining the magnesium zinc-aluminum-magnesium coating in the hot base with no zinc fluctuation on the surface.
Preferably, S1, the raw strip steel is pickled twice, and each pickling pass through six pickling tanks.
Preferably, in the S1, the running speed of the strip steel is controlled to be 80-100m/min in the first pickling process, and the temperature of a pickling tank is controlled to be 80-85 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 100-120m/min, and the temperature of the pickling tank is controlled to be 85-90 ℃.
Preferably, in S2, the temperature of the straight flame section is controlled between 620 ℃ and 650 ℃, and the temperature of the radiant tube is controlled between 630 ℃ and 660 ℃.
Preferably, in S3, the surface temperature of the temperature-controlled heating strip steel entering the zinc pot is controlled to be 430-460 ℃.
Preferably, the cooling fan load adjustment range in S3 is 20-99%.
Preferably, the zinc aluminum magnesium plating solution in the zinc pot in the S4 comprises the following components: 5.7 plus or minus 0.5wt.% of Al, 2.3 plus or minus 0.3wt.% of Mg2, and the balance being Zn.
Preferably, the temperature of the zinc-aluminum-magnesium plating solution in the zinc pot in the S4 is 390-440 ℃, the hot dip plating time is 1.5-3S, the plating thickness is 15-50 mu m, and the quality control of the plating layer on at least one surface of the strip steel is 40-225g/m 2.
Preferably, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base with no zinc fluctuation on the surface in the S4 is 6.5-6.7g/cm 3, the hardness is 140-190HV, the time for the 5% red rust of the neutral salt spray test plating strip steel to appear is 3000-4000h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating strip steel has no cracking and no peeling.
Preferably, the raw material strip steel in the S1 comprises the following components in percentage by mass: 0.05-0.2% of C, 0.28-1.5% of Mn, 0.015-0.02% of P, 0.001-0.005% of S, and the balance of Fe and unavoidable impurities.
Compared with the prior art, the technical scheme has at least the following beneficial effects:
According to the scheme, the method for eliminating the zinc fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium in the aluminum in the heat base can solve the problem of zinc fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium in the aluminum in the heat base in the prior art, improves the coating performance, reduces the energy consumption, has short flow and high efficiency, and is beneficial to industrial production.
According to the method, the scale left on the surface of the raw material can be removed to the greatest extent through twice pickling, so that the formation of zinc fluctuation defects caused by the scale left is prevented. Wherein, when the operation speed of the strip steel is reduced in the first pickling, the acid liquor fully reacts with the iron oxide scale, so that most of the iron oxide scale is removed. And during the second pickling, only a small amount of iron oxide scale is left on the surface of the strip steel, so that the production efficiency can be increased by improving the running speed of the strip steel, and the reduction of the temperature of the pickling tank is beneficial to saving energy.
The invention can reduce the core heat in the strip steel by reducing the temperature of the straight flame section, thereby reducing the temperature difference between the core part and the surface of the strip steel and being beneficial to the solidification of the subsequent plating solution; meanwhile, the heating time is shortened, and the production efficiency is improved.
The invention improves the surface temperature of the strip steel when entering the zinc pot, and obtains the raw material strip steel with smaller internal and external temperature difference. The higher surface temperature is beneficial to the reaction of the plating solution and the strip steel in the dip plating process, and the smaller internal and external temperature difference of the raw material strip steel reduces the obstruction of core heat to the solidification process of the plating solution, thereby inhibiting the zinc fluctuation defect generated by the reflux of the plating solution.
The density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base without zinc fluctuation on the surface is 6.5-6.7g/cm 3, the hardness is 140-190HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3000-4000h, and the results of the 0T bending test or the 10% deformation tensile test show that the plating layer strip steel has no cracking and peeling.
In a word, compared with other traditional methods, the method provided by the invention has the advantages that the technical problems of 'zinc fluctuation' shown in the figure 2 on the surface of the coating can be overcome by acid washing twice, reducing the temperature of a direct flame section and improving the surface temperature of the strip steel when the strip steel enters a zinc pot, so that the defect of zinc fluctuation of a magnesium zinc-aluminum-magnesium coating in aluminum in a hot base can be eliminated, energy is saved, consumption is reduced, heating time is shortened, the obstruction of strip steel core heat to the solidification process of the plating solution is reduced, the coating performance is improved, the whole process is simple to operate, the production cost is low, the efficiency is high, and the method is beneficial to industrial mass production and popularization and use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of the steps of a method for eliminating the zinc-aluminum-magnesium coating zinc relief defects of magnesium in aluminum in a thermal base according to the present invention;
FIG. 2 is a graph showing the effect of surface zinc relief of a 3mm thickness gauge hot base aluminum-based magnesium-zinc-aluminum-magnesium plating product;
FIG. 3 shows a method for eliminating the zinc fluctuation defect of a magnesium zinc-aluminum-magnesium coating in aluminum in a heat base and (3) a surface zinc relief effect pattern of the prepared magnesium zinc-aluminum-magnesium plating product of the aluminum medium-magnesium zinc-aluminum-magnesium plating product in the heat base with the thickness of 3 mm.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is shown in the figure 1, and the method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is shown as follows:
S1, acid washing: acid washing the raw material strip steel twice to obtain acid-washed strip steel;
s2, heating: reducing the heating temperature of the straight flame section when the S1 acid-washed strip steel is heated to obtain a heated strip steel;
s3, temperature control: controlling the power of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering a zinc pot, so as to obtain a temperature-controlled heating strip steel;
s4, hot dip plating: and (3) immersing the S3 temperature-controlled heating strip steel into a zinc pot to carry out hot dip plating on the zinc-aluminum-magnesium coating, thereby obtaining the magnesium zinc-aluminum-magnesium coating in the hot base with no zinc fluctuation on the surface.
In particular, the raw material strip steel in S1 is pickled twice, and each pickling pass through six pickling tanks.
Particularly, in S1, the running speed of the strip steel is controlled to be 80-100m/min in the first pickling process, and the temperature of a pickling tank is controlled to be 80-85 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 100-120m/min, and the temperature of the pickling tank is controlled to be 85-90 ℃.
In particular, in S2, the temperature of the straight flame section is controlled between 620 ℃ and 650 ℃, and the temperature of the radiant tube is controlled between 630 ℃ and 660 ℃.
In particular, in S3, the surface temperature of the temperature-controlled heating strip steel entering the zinc pot is controlled between 430 ℃ and 460 ℃.
In particular, the cooling fan load adjustment range in S3 is 20-99%.
In particular, the zinc aluminum magnesium plating solution in the zinc pot in S4 comprises the following components: 5.7 plus or minus 0.5wt.% of Al, 2.3 plus or minus 0.3wt.% of Mg2, and the balance being Zn.
In particular, the temperature of the zinc-aluminum-magnesium plating solution in the zinc pot in S4 is 390-440 ℃, the hot dip plating time is 1.5-3S, the plating thickness is 15-50 mu m, and the quality control of the plating layer on at least one surface of the strip steel is 40-225g/m 2.
Particularly, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base with no zinc fluctuation on the surface in S4 is 6.5-6.7g/cm 3, the hardness is 140-190HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3000-4000h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
In particular, the raw material strip steel in S1 comprises the following components in percentage by mass: 0.05-0.2% of C, 0.28-1.5% of Mn, 0.015-0.02% of P, 0.001-0.005% of S, and the balance of Fe and unavoidable impurities.
Example 1
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 80m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 82 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 105m/min, and the temperature of the pickling tank is controlled to be 86 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: the percentages are as follows: 0.12% of C, 1.3% of Mn, 0.016% of P and 0.001% of S; the width of the strip steel is 1000mm, and the thickness is 2.5mm;
s2, heating: reducing the heating temperature of the direct flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the direct flame section between 630 ℃ and the temperature of a radiant tube at 640 ℃ to obtain heated strip steel;
s3, temperature control: controlling the power of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering the zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be 430 ℃ to obtain the temperature control heating strip steel; wherein the cooling fan load is 60%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 6.0wt.% of Al, 2.6wt.% of Mg and the balance of Zn, wherein the temperature of the plating solution is 410 ℃, the hot dip plating time is 2.5s, the plating thickness is 30 mu m, the quality control of a plating layer on at least one surface of the strip steel is 80g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base with no zinc fluctuation on the surface is 6.5g/cm 3, the hardness is 148HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3188h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
Example 2
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 95m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 80 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 110m/min, and the temperature of the pickling tank is controlled to be 90 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: the percentages are as follows: 0.08% of C, 0.45% of Mn, 0.015% of P and 0.003% of S; the width of the strip steel is 1200mm, and the thickness is 3.5mm;
s2, heating: reducing the heating temperature of the direct flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the direct flame section to be 640 ℃, and controlling the temperature of a radiant tube to be 650 ℃ to obtain a heated strip steel;
S3, temperature control: controlling the power of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering the zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be between 460 ℃ to obtain the temperature control heating strip steel; wherein, the cooling fan load is 80%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 5.7wt.% of Al, 2.0wt.% of Mg and the balance of Zn, wherein the temperature of the plating solution is 440 ℃, the hot dip plating time is 3.0s, the plating thickness is 40 mu m, the quality control of a plating layer on at least one surface of the strip steel is 180g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is 6.6g/cm 3, the hardness is 170HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3215h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
Comparing the magnesium zinc aluminum magnesium plating product in the heat base prepared in example 1 and the magnesium zinc aluminum magnesium plating product in the heat base prepared in example 2 with the magnesium zinc aluminum magnesium plating product in the heat base prepared by other same preparation processes in the prior art, the specific process conditions and the performance parameters are shown in table 1:
Table 1 comparison table of performance parameters
As can be seen from Table 1, the method for producing the zinc-aluminum-magnesium-based steel sheet with the magnesium zinc-aluminum-magnesium plating in the medium heat base can effectively eliminate the zinc fluctuation defect on the surface of the steel sheet with the zinc-aluminum-magnesium plating in the medium heat base.
Firstly, iron scales can be effectively removed through twice pickling and optimizing pickling process parameters, and zinc fluctuation defects caused by the residual iron scales are prevented from being formed;
Secondly, the core heat in the strip steel can be effectively reduced by reducing the temperature of the straight flame section, so that the temperature difference between the core part and the surface of the strip steel is reduced, and the subsequent solidification of the plating solution is facilitated;
Finally, the reaction of the plating solution and the strip steel in the dip plating process can be promoted by increasing the surface temperature of the strip steel when entering the zinc pot.
Through the measures, the invention well avoids the occurrence of the zinc fluctuation defect on the surface of the magnesium zinc-aluminum-magnesium plating steel plate in the aluminum in the heat base, and is beneficial to industrial mass production and popularization and application.
Example 3
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 88m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 85 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 100m/min, and the temperature of the pickling tank is controlled to be 88 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: the percentages are as follows: 0.16% of C, 1.5% of Mn, 0.018% of P and 0.002% of S; the width of the strip steel is 1500mm, and the thickness is 3.0mm;
s2, heating: reducing the heating temperature of the direct flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the direct flame section to be between 620 ℃ and controlling the temperature of a radiant tube to be 630 ℃ to obtain heated strip steel;
S3, temperature control: controlling the load of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering the zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be 440 ℃ to obtain the temperature control heating strip steel; wherein the cooling fan load is 30%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 6.2wt.% of Al, 2.3wt.% of Mg and the balance of Zn, wherein the temperature of the plating solution is 430 ℃, the hot dip plating time is 1.5s, the plating thickness is 50 mu m, the quality control of a plating layer on at least one surface of the strip steel is 225g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is 6.5g/cm 3, the hardness is 190HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3899h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
Example 4
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 100m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 81 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 120m/min, and the temperature of the pickling tank is controlled to be 90 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: 0.2% of C, 1.4% of Mn, 0.015% of P and 0.005% of S; the width of the strip steel is 1100mm, and the thickness is 4.0mm;
S2, heating: reducing the heating temperature of the straight flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the straight flame section between 650 ℃ and 660 ℃ and controlling the temperature of a radiant tube to obtain the heated strip steel;
S3, temperature control: controlling the load of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering a zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be 430 ℃ to obtain the temperature control heating strip steel; wherein the cooling fan load is 90%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 5.2wt.% of Al, 2.2wt.% of Mg, the balance Zn. The temperature of the plating solution is 390 ℃, the hot dip plating time is 2.0s, the plating thickness is 15 mu m, the quality control of the plating layer on at least one surface of the strip steel is 40g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the hot base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base with no zinc fluctuation on the surface is 6.7g/cm 3, the hardness is 160HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3539h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
Example 5
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
s1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 90m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 82 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 120m/min, and the temperature of the pickling tank is controlled to be 85 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: 0.05% of C, 0.28% of Mn, 0.02% of P and 0.003% of S; the width of the strip steel is 1200mm, and the thickness is 3.5mm;
s2, heating: reducing the heating temperature of the direct flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the direct flame section to be between 620 ℃ and controlling the temperature of a radiant tube to be 630 ℃ to obtain heated strip steel;
S3, temperature control: controlling the load of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering the zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be 440 ℃ to obtain the temperature control heating strip steel; wherein the cooling fan load is 20%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 6.0wt.% of Al, 2.1wt.% of Mg, the balance Zn. The temperature of the plating solution is 420 ℃, the hot dip plating time is 3.0s, the plating thickness is 20 mu m, the quality of a plating layer on at least one surface of the strip steel is controlled to be 50g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the hot base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base with no zinc fluctuation on the surface is 6.5g/cm 3, the hardness is 155HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3326h, and the result of the 0T bending test or the 10% deformation tensile test shows that the plating layer strip steel has no cracking and no peeling.
Example 6
The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is as follows:
S1, acid washing: carrying out acid washing on raw material strip steel twice, wherein each acid washing process comprises six acid washing tanks, wherein the running speed of the strip steel is controlled to be 90m/min in the first acid washing process, and the temperature of the acid washing tanks is controlled to be 85 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 100m/min, and the temperature of the pickling tank is controlled to be 86 ℃. Obtaining acid-washing strip steel; wherein the raw material strip steel comprises the following components in percentage by mass: 0.1% of C, 0.5% of Mn, 0.017% of P and 0.002% of S; the width of the strip steel is 1200mm, and the thickness is 3.5mm;
S2, heating: reducing the heating temperature of the direct flame section when the S1 acid-washed strip steel is heated, controlling the temperature of the direct flame section between 630 ℃ and the temperature of a radiant tube between 650 ℃ to obtain a heated strip steel;
S3, temperature control: controlling the load of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering the zinc pot, and controlling the surface temperature of the temperature control heating strip steel when entering the zinc pot to be 450 ℃ to obtain the temperature control heating strip steel; wherein the cooling fan load is 99%;
S4, hot dip plating: immersing the S3 temperature-controlled heating strip steel into a zinc pot for hot dip plating of zinc-aluminum-magnesium plating layers, wherein the zinc-aluminum-magnesium plating solution in the zinc pot comprises the following components in percentage by weight: 6.0wt.% of Al, 2.5wt.% of Mg, the balance Zn. The temperature of the plating solution is 430 ℃, the hot dip plating time is 2.5s, the plating thickness is 25 mu m, the quality of a plating layer on at least one surface of the strip steel is controlled to be 60g/m 2, and the magnesium zinc-aluminum-magnesium plating layer in the hot base with no zinc fluctuation on the surface is obtained.
In the embodiment, the density of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the thermal base with no zinc fluctuation on the surface is 6.6g/cm 3, the hardness is 141HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3024 hours, and the results of the 0T bending test or the 10% deformation tensile test show that the plating layer strip steel has no cracking and no peeling.
According to the scheme, the method for eliminating the zinc fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium in the aluminum in the heat base can solve the problem of zinc fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium in the aluminum in the heat base in the prior art, improves the coating performance, reduces the energy consumption, has short flow and high efficiency, and is beneficial to industrial production.
According to the method, the scale left on the surface of the raw material can be removed to the greatest extent through twice pickling, so that the formation of zinc fluctuation defects caused by the scale left is prevented. Wherein, when the operation speed of the strip steel is reduced in the first pickling, the acid liquor fully reacts with the iron oxide scale, so that most of the iron oxide scale is removed. And during the second pickling, only a small amount of iron oxide scale is left on the surface of the strip steel, so that the production efficiency can be increased by improving the running speed of the strip steel, and the reduction of the temperature of the pickling tank is beneficial to saving energy.
The invention can reduce the core heat in the strip steel by reducing the temperature of the straight flame section, thereby reducing the temperature difference between the core part and the surface of the strip steel and being beneficial to the solidification of the subsequent plating solution; meanwhile, the heating time is shortened, and the production efficiency is improved.
The invention improves the surface temperature of the strip steel when entering the zinc pot, and obtains the raw material strip steel with smaller internal and external temperature difference. The higher surface temperature is beneficial to the reaction of the plating solution and the strip steel in the dip plating process, and the smaller internal and external temperature difference of the raw material strip steel reduces the obstruction of core heat to the solidification process of the plating solution, thereby inhibiting the zinc fluctuation defect generated by the reflux of the plating solution.
The density of the magnesium zinc aluminum magnesium plating layer in the surface zinc fluctuation-free heat base is 6.5-6.7g/cm 3, the hardness is 140-190HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3000-4000h, and the result of the 0T bending test or the 10% deformation tensile test shows that the strip steel has no cracking and peeling.
In a word, compared with other traditional methods, the method provided by the invention has the advantages that the technical problems of 'zinc fluctuation' shown in the figure 2 on the surface of the coating can be overcome by acid washing twice, reducing the temperature of a direct flame section and improving the surface temperature of the strip steel when the strip steel enters a zinc pot, so that the defect of zinc fluctuation of a magnesium zinc-aluminum-magnesium coating in aluminum in a hot base can be eliminated, energy is saved, consumption is reduced, heating time is shortened, the obstruction of strip steel core heat to the solidification process of the plating solution is reduced, the coating performance is improved, the whole process is simple to operate, the production cost is low, the efficiency is high, and the method is beneficial to industrial mass production and popularization and use.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The method for eliminating the zinc fluctuation defect of the magnesium zinc aluminum magnesium plating layer in the aluminum in the heat base is characterized by comprising the following steps of:
S1, acid washing: acid washing the raw material strip steel twice to obtain acid-washed strip steel;
s2, heating: reducing the heating temperature of the straight flame section when the S1 acid-washed strip steel is heated to obtain a heated strip steel;
s3, temperature control: controlling the power of a cooling fan to raise the surface temperature of the S2 heating strip steel when entering a zinc pot, so as to obtain a temperature-controlled heating strip steel;
s4, hot dip plating: and (3) immersing the S3 temperature-controlled heating strip steel into a zinc pot to carry out hot dip plating on the zinc-aluminum-magnesium coating, thereby obtaining the magnesium zinc-aluminum-magnesium coating in the hot base with no zinc fluctuation on the surface.
2. The method for eliminating the fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium system zinc in the aluminum in the hot radical according to claim 1, wherein the raw material strip steel is pickled twice in S1, and each pickling pass through six pickling tanks.
3. The method for eliminating the fluctuation defect of the magnesium zinc-aluminum-magnesium coating in the aluminum in the heat base according to claim 2, wherein the running speed of the strip steel is controlled to be 80-100m/min in the first pickling process in S1, and the temperature of the pickling tank is controlled to be 80-85 ℃; in the second pickling process, the running speed of the strip steel is controlled to be 100-120m/min, and the temperature of the pickling tank is controlled to be 85-90 ℃.
4. The method for eliminating the fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium system zinc in the aluminum in the heat radical as claimed in claim 1, wherein the temperature of the direct flame section is controlled between 620 ℃ and 650 ℃ in the S2, and the temperature of the radiant tube is controlled between 630 ℃ and 660 ℃.
5. The method for eliminating the fluctuation defect of the zinc-aluminum-magnesium coating of the magnesium system zinc in the aluminum in the hot radical according to claim 1, wherein the surface temperature of the temperature-controlled heating strip steel entering the zinc pot is controlled between 430 ℃ and 460 ℃ in S3.
6. The method for eliminating the zinc fluctuation defect of the magnesium zinc-aluminum-magnesium coating in the aluminum in the heat radical according to claim 1, wherein the load adjustment range of the cooling fan in the S3 is 20-99%.
7. The method for eliminating the zinc fluctuation defect of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the heat base according to claim 1, wherein the zinc-aluminum-magnesium plating solution in the zinc pot in the S4 comprises the following components: 5.7 plus or minus 0.5wt.% of Al, 2.3 plus or minus 0.3wt.% of Mg, and the balance of Zn.
8. The method for eliminating the zinc fluctuation defect of the magnesium zinc-aluminum-magnesium plating layer in the aluminum in the hot radical according to claim 1, wherein the temperature of the zinc-aluminum-magnesium plating solution in the zinc pot in the S4 is 390-440 ℃, the hot dip plating time is 1.5-3S, the plating thickness is 15-50 μm, and the quality of the plating layer on at least one surface of the strip steel is controlled to 40-225g/m 2.
9. The method for eliminating the zinc fluctuation defect of the magnesium zinc-aluminum-magnesium plating layer in the hot base aluminum according to claim 1, wherein the density of the magnesium zinc-aluminum-magnesium plating layer in the hot base aluminum with no zinc fluctuation on the surface in the S4 is 6.5-6.7g/cm 3, the hardness is 140-190HV, the time for the 5% red rust of the neutral salt spray test plating layer strip steel to appear is 3000-4000h, and the result shows that the strip steel has no cracking and no peeling in the 0T bending test or the 10% deformation tensile test.
10. The method for eliminating the zinc fluctuation defect of the magnesium zinc-aluminum-magnesium coating in the aluminum in the hot radical according to claim 1, wherein the raw material strip steel in S1 comprises the following components in percentage by mass: 0.05-0.2% of C, 0.28-1.5% of Mn, 0.015-0.02% of P, 0.001-0.005% of S, and the balance of Fe and unavoidable impurities.
CN202410025404.XA 2024-01-08 2024-01-08 Method for eliminating zinc fluctuation defect of magnesium zinc-aluminum-magnesium plating layer in aluminum in heat base Pending CN117904566A (en)

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