CN113025936A - High-corrosion-resistance hot-dip zinc-aluminum-magnesium-plated steel plate and manufacturing method thereof - Google Patents
High-corrosion-resistance hot-dip zinc-aluminum-magnesium-plated steel plate and manufacturing method thereof Download PDFInfo
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- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
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- 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
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- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
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Abstract
The invention particularly relates to a high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate and a manufacturing method thereof, belonging to the technical field of corrosion-resistant steel preparation, and the method comprises the following steps: obtaining a hot-dip galvanized aluminum-magnesium coating steel plate; performing at least two times of soaking cooling on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the soaking cooling liquid of the first soaking cooling is a desalted water solution containing sodium hydroxide during the at least two times of soaking cooling, so as to obtain the hot-dip galvanized aluminum-magnesium plated steel plate with the hydroxide coating; the method can be realized on the existing continuous hot galvanizing production line through simple transformation, has low production cost and strong practicability, and is easy to popularize and use.
Description
Technical Field
The invention belongs to the technical field of corrosion-resistant steel preparation, and particularly relates to a high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate and a manufacturing method thereof.
Background
The proper amount of aluminum and magnesium is added into the hot-dip galvanized coating, so that the corrosion resistance of the coating can be effectively improved, the time from the corrosion of the coating to the corrosion of a steel plate is delayed, and the service life of the steel plate is prolonged. The hot-dip galvanized aluminum-magnesium plated steel plate is mainly used for producing building materials, electric appliance shells, farming and pasturing machinery and the like, and high corrosion resistance is the main requirement of users on the hot-dip galvanized aluminum-magnesium plated steel plate. In recent years, various hot-dip galvanized aluminum-magnesium-coated steel sheets have been developed successively by domestic and foreign iron and steel companies, and the corrosion time of the coating is retarded by adjusting the coating composition. However, when the zinc-aluminum-magnesium plated steel sheet is exposed to humid air, electrochemical corrosion occurs on the surface, and white rust is formed. The combination of chemical components of the zinc-aluminum-magnesium coated steel plate and how to carry out reasonable surface treatment to delay the time of white rust of the zinc-aluminum-magnesium coated steel plate is one of the problems to be solved at present.
Chinese patent application CN201611092936 provides a special chromium-free fingerprint-resistant liquid for a zinc-aluminum-magnesium coated steel plate and a preparation method thereof, and the zinc-aluminum-magnesium coated steel plate has excellent corrosion resistance, yellowing resistance, fingerprint resistance and the like through the design and preparation of chemical components of the fingerprint-resistant liquid; the zinc-aluminum-magnesium coated steel plate obtained by the method comprises a steel substrate, a zinc-aluminum-magnesium coating and a fingerprint-resistant coating from inside to outside in the thickness direction.
Disclosure of Invention
The applicant finds in the course of the invention that: the zinc-aluminum-magnesium coating steel plate treated by the special chromium-free fingerprint-resistant liquid for the zinc-aluminum-magnesium coating steel plate is only dependent on the fingerprint-resistant coating to improve the corrosion resistance of the zinc-aluminum-magnesium coating surface, and the fingerprint-resistant coating is easy to generate micropores and cracks and has a limited effect on improving the corrosion resistance of the zinc-aluminum-magnesium coating surface.
The present invention has been made in view of the above problems, and has been made to provide a highly corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet and a method for manufacturing the same, which overcome the above problems or at least partially solve the above problems.
The embodiment of the invention provides a method for manufacturing a high-corrosion-resistance hot-dip zinc-aluminum-magnesium-plated steel plate, which comprises the following steps:
obtaining a hot-dip galvanized aluminum-magnesium coating steel plate;
performing at least two times of soaking cooling on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the soaking cooling liquid for the first time of soaking cooling is a desalted water solution containing sodium hydroxide, so as to obtain the hot-dip galvanized aluminum-magnesium plated steel plate with a hydroxide coating;
and (3) finishing the hot-dip galvanized aluminum-magnesium plated steel plate with the hydroxide coating, and then reacting the finished steel plate with the fingerprint-resistant surface treatment liquid to perform fingerprint-resistant surface treatment to obtain the high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate with the modified hydroxide coating and the fingerprint-resistant coating.
Optionally, the pH value of the desalted water solution containing sodium hydroxide is 12.4-14, and the temperature of the desalted water solution containing sodium hydroxide is 80-170 ℃.
Optionally, in the step of performing immersion cooling on the hot-dip galvanized aluminum magnesium plated steel plate for at least two times, the immersion cooling is performed for two times, and the immersion cooling specifically includes:
immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling;
and soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank.
Optionally, the speed of the steel strip cooled by the hot-dip galvanized aluminum-magnesium plated steel plate in the first soaking is less than or equal to 90 m/min.
Optionally, the obtaining of the hot-dip galvanized aluminum magnesium plated steel plate specifically includes:
obtaining a steel substrate;
and immersing the steel substrate into an immersion plating pot for hot-dip plating of zinc, aluminum and magnesium, and then carrying out air cooling to obtain the hot-dip zinc, aluminum and magnesium plated steel plate.
Optionally, the steel substrate is immersed in an immersion plating bath for hot-dip plating of zinc, aluminum and magnesium, and the molten metal liquid in the immersion plating bath comprises the following chemical components in percentage by mass: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
Optionally, the fingerprint-resistant surface treatment liquid comprises at least one of alkoxysilane, fluorine-containing octyl silane, fluorine-containing decyl silane, vinyl silane, amino silane, epoxy silane and cycloaliphatic epoxy silane.
Based on the same inventive concept, the embodiment of the invention also provides a high-corrosion-resistance hot-dip galvanized aluminum-magnesium coated steel plate, which is characterized in that: the high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet is produced by the method.
Optionally, the high-corrosion-resistance hot-dip galvanized aluminum magnesium plated steel plate includes a steel substrate, at least one surface of the steel substrate is provided with a zinc-aluminum-magnesium plated layer, a modified hydroxide coating is provided on a surface of the zinc-aluminum-magnesium plated layer, which is far away from the steel substrate, and a fingerprint-resistant coating is provided on a surface of the modified hydroxide coating, which is far away from the zinc-aluminum-magnesium plated layer, where the zinc-aluminum-magnesium plated layer includes, by mass: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
Optionally, the film weight of the fingerprint-resistant coating is 0.6-1.8g/m2。
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides a method for manufacturing a high-corrosion-resistance hot-dip zinc-aluminum-magnesium-plated steel plate, which comprises the following steps: obtaining a hot-dip galvanized aluminum-magnesium coating steel plate; performing at least two times of soaking cooling on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the soaking cooling liquid for the first time of soaking cooling is a desalted water solution containing sodium hydroxide, so as to obtain the hot-dip galvanized aluminum-magnesium plated steel plate with a hydroxide coating; finishing the hot-dip galvanized aluminum-magnesium plated steel plate with the hydroxide coating, and then reacting the finished steel plate with a fingerprint-resistant surface treatment solution to perform fingerprint-resistant surface treatment to obtain a high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate with a modified hydroxide coating and a fingerprint-resistant coating; the method comprises the steps of adding a certain amount of NaOH into a water quenching tank, controlling the temperature of the water quenching tank and the speed of strip steel, preparing a hydroxide coating on the surface of a hot-dip galvanized aluminum-magnesium coating steel plate, carrying out surface treatment by using silane-containing fingerprint-resistant liquid, modifying the hydroxide coating, and preparing a fingerprint-resistant coating with a certain thickness, wherein the modified hydroxide coating can improve the corrosion resistance of the zinc-aluminum-magnesium coating, silane can be hydrolyzed when meeting water to generate Si-OH, and generates condensation with the hydroxide coating to form chemical bonds of Si-O-and Mg, Al or Zn, and the hydroxide coating is modified, so that the hole sealing effect is achieved on hydroxide, and the binding force between the hydroxide coating and the fingerprint-resistant coating is improved. The fingerprint-resistant coating has excellent corrosion resistance, and the high-corrosion-resistance hot-dip galvanized aluminum-magnesium coated steel plate is finally obtained.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a steel plate according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the applicant finds in the course of the invention that: when the zinc-aluminum-magnesium coating steel plate is placed in humid air, electrochemical corrosion occurs on the surface to form white rust, the conventional scheme is that special chromium-free fingerprint-resistant liquid treatment is adopted, however, the corrosion resistance of the zinc-aluminum-magnesium coating surface of the zinc-aluminum-magnesium coating steel plate treated by the special chromium-free fingerprint-resistant liquid treatment of the zinc-aluminum-magnesium coating steel plate is improved by only depending on a fingerprint-resistant coating, micropores and cracks are easy to appear on the fingerprint-resistant coating, and the improvement effect on the corrosion resistance of the zinc-aluminum-magnesium coating surface is limited; to this end, the present application intends to provide a corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet.
According to an exemplary embodiment of the present invention, there is provided a method of manufacturing a high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet, including:
s1, obtaining a hot-dip galvanized aluminum magnesium coating steel plate;
s2, performing at least two times of soaking cooling on the hot-dip galvanized aluminum-magnesium coated steel plate, wherein in the at least two times of soaking cooling, the soaking cooling liquid for the first time of soaking cooling is a desalted water solution containing sodium hydroxide, so as to obtain the hot-dip galvanized aluminum-magnesium coated steel plate with the hydroxide coating; it should be noted that: when the immersion cooling is started, the temperature of the hot-dip galvanized aluminum magnesium plated steel plate is 100-300 ℃, and the temperature is mainly determined by the temperature of the hot-dip galvanized aluminum magnesium plated steel plate prepared in the previous step.
And S3, finishing the hot-dip galvanized aluminum-magnesium plated steel plate with the hydroxide coating, and then reacting the finished steel plate with the fingerprint-resistant surface treatment liquid to perform fingerprint-resistant surface treatment to obtain the high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate with the modified hydroxide coating and the fingerprint-resistant coating.
According to the method, a certain amount of NaOH is added into a water quenching tank, the temperature of the water quenching tank and the speed of a strip steel are controlled, a hydroxide coating is prepared on the surface of a hot-dip galvanized aluminum-magnesium coating steel plate, surface treatment is carried out by adopting silane-containing fingerprint-resistant surface treatment liquid, the hydroxide coating is modified, a fingerprint-resistant coating with a certain thickness is prepared, the modified hydroxide coating can improve the corrosion resistance of the zinc-aluminum-magnesium coating, silane can be hydrolyzed to generate Si-OH when meeting water, the silane and the hydroxide coating generate condensation action to form chemical bonds of Si-O-and Mg, Al or Zn, and the hydroxide coating is modified, so that the hole sealing effect is achieved on the hydroxide, and the binding force between the hydroxide and the fingerprint-resistant coating is improved. The fingerprint-resistant coating has excellent corrosion resistance, and the high-corrosion-resistance hot-dip galvanized aluminum-magnesium coated steel plate is finally obtained.
As an alternative embodiment, the pH of the desalted aqueous solution containing sodium hydroxide is from 12.4 to 14 and the temperature of the desalted aqueous solution containing sodium hydroxide is from 80 ℃ to 170 ℃.
The reason for controlling the pH value of the desalted water solution containing sodium hydroxide to be 12.4-14 is that a hydroxide coating is prepared on the surface of the zinc-aluminum-magnesium plating plate in a proper pH value range, the adverse effect of overlarge pH value is that the zinc-aluminum-magnesium plating layer is easy to corrode and damage, and the adverse effect of undersize is that a complete hydroxide coating cannot be prepared;
the temperature of the desalted water solution containing sodium hydroxide is controlled to be 80-170 ℃ so as to prepare a hydroxide coating on the surface of the zinc-aluminum-magnesium plating plate in a proper temperature range, the adverse effect of overlarge temperature value is high production cost, and the adverse effect of undersize value is that a complete hydroxide coating cannot be prepared.
As an optional embodiment, the hot-dip galvanized aluminum magnesium plated steel sheet is subjected to at least two immersion cooling times, where the immersion cooling times are two, and the immersion cooling times specifically include:
immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling;
and soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank. .
And (3) soaking and cooling twice, specifically, the solution in the second water quenching tank is desalted water, and the solution has the functions of removing residual alkali liquor on the surface of the zinc-aluminum-magnesium coated steel plate and cooling the strip steel.
As an optional implementation mode, the speed of the steel strip cooled in the first soaking of the hot-dip galvanized aluminum-magnesium plated steel plate is less than or equal to 90 m/min.
The reason for controlling the speed of the steel strip to be less than or equal to 90m/min is that the surface of the hot-dip galvanized aluminum magnesium plated steel plate has enough time to react with the desalted water solution containing sodium hydroxide, and the adverse effect of overlarge speed value is that a complete hydroxide coating cannot be prepared.
As an optional embodiment, the method for obtaining a hot-dip galvanized aluminum-magnesium plated steel sheet specifically includes:
obtaining a steel substrate;
and immersing the steel substrate into a dip coating pot for hot dip coating of zinc, aluminum and magnesium, and then carrying out air cooling to obtain the hot dip coating zinc, aluminum and magnesium steel plate.
Specifically, a steel substrate is immersed into an immersion plating pot for hot dip plating of zinc-aluminum magnesium, and the chemical composition of molten metal liquid in the immersion plating pot comprises the following components in percentage by mass: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
As an alternative embodiment, the fingerprint resistant surface treatment liquid includes at least one of alkoxysilane, fluorooctyl silane, fluorodecyl silane, vinyl silane, amino silane, epoxy silane, and cycloaliphatic epoxy silane.
In summary, the method specifically includes:
s1, immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate;
s2, air cooling is carried out on the hot-dip galvanized aluminum magnesium plated steel plate;
s3, soaking and cooling the hot-dip galvanized aluminum magnesium plated steel plate in a first water quenching tank;
s4, soaking and cooling the hot-dip galvanized aluminum magnesium plated steel plate in a second water quenching tank;
s5, finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
s6, carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium coating steel plate.
According to another exemplary embodiment of the invention, a high corrosion resistant hot dip galvanized aluminum magnesium plated steel plate is provided, which is manufactured by the manufacturing method of the high corrosion resistant hot dip galvanized aluminum magnesium plated steel plate provided above, specifically, the high corrosion resistant hot dip galvanized aluminum magnesium plated steel plate comprises a steel substrate, at least one surface of the steel substrate is provided with a zinc aluminum magnesium plating layer, the surface of the zinc aluminum magnesium plating layer far away from the steel substrate is provided with a modified hydroxide coating, the surface of the modified hydroxide coating far away from the zinc aluminum magnesium plating layer is provided with a fingerprint resistant coating, and the chemical compositions of the zinc aluminum magnesium plating layer comprise, by mass percent: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
Controlling the mass percent of Mg to be 1.4-3.2% and the mass percent of Al to be 1.1-11.2% so as to form Zn/Al/MgZn with uniform structure2Ternary eutectic phase to improve the corrosion resistance of the coating, wherein the adverse effect of excessively large mass percentage is that a coarse eutectic phase is easily formed to reduce the corrosion resistance of the coating, and the adverse effect of excessively small mass percentage is that Zn/Al/MgZn cannot be formed2The corrosion resistance of the plating layer is reduced due to the ternary eutectic phase; the mass percent of Mg is preferably 1.5-2.5%; the mass percent of Al is preferably 1.6-6.0%;
the reason for controlling the mass percent of Si to be 0-0.03% is that Si can improve the compactness of a plating layer so as to improve the corrosion resistance of the plating layer, and the adverse effect of overlarge mass percent is that coarse inclusions are easy to form so as to reduce the corrosion resistance of the plating layer; the mass percent of Si is preferably 0-0.02%;
the high-corrosion-resistance hot-dip galvanized aluminum magnesium plated steel plate with the multilayer protection effect is obtained by preparing the modified hydroxide coating and the fingerprint-resistant coating on the surface of the hot-dip galvanized aluminum magnesium plated steel plate with a certain chemical ratio, and the problem that white rust is easy to appear on the surface of the hot-dip galvanized aluminum magnesium plated steel plate in the prior art is solved.
As an alternative embodiment, the fingerprint resistant coating has a film weight of 0.6 to 1.8g/m2。
Controlling the film weight of the fingerprint-resistant coating to be 0.6-1.8g/m2The reason for this is that the corrosion resistance of the hot-dip galvanized aluminum-magnesium plated steel sheet can be improved, the adverse effect of excessively large film weight is to lower the adhesion of the fingerprint resistant coating layer to affect the corrosion resistance of the steel sheet, the adverse effect of excessively small film weight is to fail to cover the surface of the plating layer to affect the corrosion resistance of the steel sheet, and the film weight is preferably 0.8 to 1.6g/m2。
The high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet and the method for manufacturing the same according to the present application will be described in detail with reference to examples, comparative examples, and experimental data.
Example 1
A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet, comprising the steps of:
(1) immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 1.4%, Al: 1.1%, Si: less than or equal to 0.01 percent, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling; wherein the pH value of the solution in the first water quenching tank is 12.4, the temperature of the solution in the first water quenching tank is 170 ℃, and the speed of the steel strip in the first water quenching tank is 70 m/min;
(4) soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank;
(5) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(6) performing fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium coated steel plate, wherein the fingerprint-resistant liquid component comprises methyltrimethoxysilane, and the film weight of the prepared fingerprint-resistant coating is 0.6g/m2。
Example 2
A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet, comprising the steps of:
(1) immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 1.5%, Al: 1.6%, Si: less than or equal to 0.01 percent, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling; wherein the pH value of the solution in the first water quenching tank is 13.1, the temperature of the solution in the first water quenching tank is 160 ℃, and the speed of the steel strip in the first water quenching tank is 90 m/min;
(4) soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank;
(5) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(6) carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium coated steel plate, wherein the fingerprint-resistant liquid comprises 1H,1H,2H, 2H-perfluoro octyl trichlorosilane, and the film weight of the prepared fingerprint-resistant coating is 0.8g/m2。
Example 3
A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet, comprising the steps of:
(1) immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 1.6%, Al: 2%, Si: less than or equal to 0.01 percent, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling; wherein the pH value of the solution in the first water quenching tank is 13.4, the temperature of the solution in the first water quenching tank is 120 ℃, and the speed of the steel strip in the first water quenching tank is 80 m/min;
(4) soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank;
(5) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(6) carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the fingerprint-resistant liquid component comprises heptadecafluorodecyltriethoxysilane, and the film weight of the prepared fingerprint-resistant coating is 1.2g/m2。
Example 4
A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet, comprising the steps of:
(1) immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 2.5%, Al: 6%, Si: 0.2%, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling; wherein the pH value of the solution in the first water quenching tank is 13.88, the temperature of the solution in the first water quenching tank is 90 ℃, and the speed of the steel strip in the first water quenching tank is 70 m/min;
(4) soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank;
(5) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(6) carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the fingerprint-resistant liquid component comprises 3-aminopropyltriethoxysilane, and the film weight of the prepared fingerprint-resistant coating is 1.6g/m2。
Example 5
A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet, comprising the steps of:
(1) immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 3.2%, Al: 11.2%, Si: 0.3%, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling; wherein the pH value of the solution in the first water quenching tank is 14, the temperature of the solution in the first water quenching tank is 80 ℃, and the speed of the steel strip in the first water quenching tank is 80 m/min;
(4) soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank;
(5) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(6) carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium coated steel plate, wherein the fingerprint-resistant liquid component comprises vinyl trichlorosilane, and the film weight of the prepared fingerprint-resistant coating is 1.8g/m2。
Comparative example 1
(1) Immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 1.5%, Al: 1.4%, Si: less than or equal to 0.01 percent, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a water quenching tank for soaking and cooling;
(4) and finishing the hot-dip galvanized aluminum-magnesium coating steel plate.
Comparative example 2
(1) Immersing a steel substrate into a dip coating pot, and carrying out hot dip coating on zinc, aluminum and magnesium to obtain a hot dip coating zinc, aluminum and magnesium coated steel plate; wherein the molten metal liquid in the immersion plating pot comprises the following chemical components in percentage by mass: mg: 3%, Al: 11%, Si: 0.2%, and the balance of Zn and inevitable impurities.
(2) Air cooling is carried out on the hot-dip galvanized aluminum-magnesium coating steel plate;
(3) immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a water quenching tank for soaking and cooling;
(4) finishing the hot-dip galvanized aluminum-magnesium coating steel plate;
(5) carrying out fingerprint-resistant surface treatment on the hot-dip galvanized aluminum-magnesium coated steel plate, wherein the fingerprint-resistant liquid component comprises gamma-aminopropyltriethoxysilane, and the film weight of the prepared fingerprint-resistant coating is 1.2g/m2。
It should be noted that: in examples 1 to 5 and comparative examples 1 to 2 above, the film weight of the fingerprint resistant coating was measured using a NR2100 portable infrared oil film thickness gauge.
Examples of the experiments
The hot dip zinc aluminum magnesium plated steel sheets manufactured in examples 1 to 5 and comparative examples 1 to 2 were sampled and subjected to a salt spray test according to GBT10125 to 2012, and the test results are shown in the following table.
The data in the table show that the corrosion resistance of the hot-dip galvanized aluminum magnesium coated steel plate is superior to that of steel plates in various proportions, which shows that the hot-dip galvanized aluminum magnesium coated steel plate prepared by the method provided by the embodiment of the application avoids the problem that white rust is easy to appear on the surface of the hot-dip galvanized aluminum magnesium coated steel plate in the prior art.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the high-corrosion-resistance hot-dip zinc-aluminum magnesium plated steel plate provided by the embodiment of the invention, the modified hydroxide coating and the fingerprint-resistant coating are prepared on the surface of the hot-dip zinc-aluminum magnesium plated steel plate with a certain chemical ratio, so that the high-corrosion-resistance hot-dip zinc-aluminum magnesium plated steel plate with a multilayer protection effect is obtained, and the problem that white rust is easy to appear on the surface of the hot-dip zinc-aluminum magnesium plated steel plate in the prior art is solved;
(2) according to the manufacturing method of the high-corrosion-resistance hot-dip galvanized aluminum-magnesium coated steel plate provided by the embodiment of the invention, a certain amount of NaOH is added into a water quenching tank, the temperature of the water quenching tank and the speed of a steel strip are controlled, a hydroxide coating is prepared on the surface of the hot-dip galvanized aluminum-magnesium coated steel plate, surface treatment is carried out by adopting silane-containing fingerprint-resistant liquid, the hydroxide coating is modified, and the fingerprint-resistant coating with a certain thickness is prepared. The modified hydroxide coating can improve the corrosion resistance of the zinc-aluminum-magnesium coating, silane can be hydrolyzed to generate Si-OH when meeting water, and generates condensation with the hydroxide coating to form chemical bonds of Si-O-and Mg, Al or Zn, and the hydroxide coating is modified, so that the hole sealing effect on the hydroxide is realized, and the binding force between the hydroxide coating and the fingerprint-resistant coating is improved. The fingerprint-resistant coating has excellent corrosion resistance, and finally the high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate is obtained;
(3) the manufacturing method of the high-corrosion-resistance hot-dip galvanized aluminum-magnesium coated steel plate provided by the embodiment of the invention can be realized on the existing continuous hot-dip galvanizing production line through simple transformation, and has the advantages of low production cost, strong practicability and easiness in popularization and use.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet, characterized by comprising:
obtaining a hot-dip galvanized aluminum-magnesium coating steel plate;
performing at least two times of soaking cooling on the hot-dip galvanized aluminum-magnesium plated steel plate, wherein the soaking cooling liquid for the first time of soaking cooling is a desalted water solution containing sodium hydroxide, so as to obtain the hot-dip galvanized aluminum-magnesium plated steel plate with a hydroxide coating;
and (3) finishing the hot-dip galvanized aluminum-magnesium plated steel plate with the hydroxide coating, and then reacting the finished steel plate with the fingerprint-resistant surface treatment liquid to perform fingerprint-resistant surface treatment to obtain the high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel plate with the modified hydroxide coating and the fingerprint-resistant coating.
2. The method for producing a high corrosion-resistant hot dip galvanized aluminum magnesium plated steel sheet according to claim 1, wherein the pH of the sodium hydroxide-containing desalted water solution is 12.4 to 14, and the temperature of the sodium hydroxide-containing desalted water solution is 80 to 170 ℃.
3. The method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet according to claim 1, wherein the step of performing immersion cooling on the hot-dip galvanized aluminum magnesium plated steel sheet at least twice, the immersion cooling being performed twice, specifically comprises:
immersing the hot-dip galvanized aluminum-magnesium plated steel plate into a first water quenching tank for soaking and cooling;
and soaking and cooling the hot-dip galvanized aluminum-magnesium plated steel plate in a second water quenching tank.
4. The method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet according to claim 1, wherein the strip speed of the hot-dip galvanized aluminum-magnesium plated steel sheet cooled in the first immersion is 90m/min or less.
5. The method for manufacturing a high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet according to claim 1, wherein the step of obtaining a hot-dip galvanized aluminum magnesium plated steel sheet specifically includes:
obtaining a steel substrate;
and immersing the steel substrate into an immersion plating pot for hot-dip plating of zinc, aluminum and magnesium, and then carrying out air cooling to obtain the hot-dip zinc, aluminum and magnesium plated steel plate.
6. The method for manufacturing a highly corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet according to claim 2, wherein said steel substrate is immersed in an immersion plating bath in which a chemical composition of a molten metal bath includes, in terms of mass percent: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
7. The method of manufacturing a high corrosion-resistant hot-dip galvanized aluminum-magnesium plated steel sheet according to claim 1, wherein the fingerprint-resistant surface treatment liquid includes at least one of alkoxysilane, fluorine-containing octylsilane, fluorine-containing decylsilane, vinylsilane, aminosilane, epoxysilane, and cycloaliphatic epoxysilane.
8. A high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet characterized by being produced by the method for producing a high corrosion-resistant hot-dip galvanized aluminum magnesium plated steel sheet according to any one of claims 1 to 7.
9. The high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel sheet according to claim 8, wherein the high-corrosion-resistance hot-dip galvanized aluminum-magnesium plated steel sheet comprises a steel substrate, at least one surface of the steel substrate is provided with a zinc-aluminum-magnesium plated layer, the surface of the zinc-aluminum-magnesium plated layer, which is far away from the steel substrate, is provided with a modified hydroxide coating, the surface of the modified hydroxide coating, which is far away from the zinc-aluminum-magnesium plated layer, is provided with a fingerprint-resistant coating, and the chemical composition of the zinc-aluminum-magnesium plated layer comprises the following components in: mg: 1.4-3.2%, Al: 1.1-11.2%, Si: 0 to 0.03 percent, and the balance of Zn and inevitable impurities.
10. The high corrosion-resistant hot dip galvanized aluminum-magnesium plated steel sheet according to claim 9, wherein the fingerprint resistant coating layer has a film weight of 0.6 to 1.8g/m2。
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