CN113355621B - Method for improving distinctness of image of zinc-aluminum-magnesium plate surface - Google Patents
Method for improving distinctness of image of zinc-aluminum-magnesium plate surface Download PDFInfo
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- CN113355621B CN113355621B CN202110475708.2A CN202110475708A CN113355621B CN 113355621 B CN113355621 B CN 113355621B CN 202110475708 A CN202110475708 A CN 202110475708A CN 113355621 B CN113355621 B CN 113355621B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention discloses a method for improving the distinctness of image of a zinc-aluminum-magnesium plate surface, which comprises the following steps: heating, hot rolling, acid washing, cold rolling and annealing the plate blank before rolling to obtain a heat-treated plate; and carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than or equal to 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain the hot-dip galvanized aluminum-magnesium coated steel. The invention discovers that the surface preoxidation treatment is carried out by adopting alkali liquor with the pH value of more than or equal to 10 in the continuous production of hot galvanizing, and the surface preoxidation of a zinc-aluminum-magnesium coating can form surface zinc oxide (ZnO) and alkaline zinc chloride (Zn)5(0H)8Cl2·H2O) and basic zinc aluminum carbonate (Zn)6A12(OH)16CO3·4H2O), and the like, and the existence of the corrosion products can effectively obstruct the transmission of electrons between the plating layer and external substances, improve the corrosion resistance of the plating layer and simultaneously effectively improve the distinctness of image keeping capability of the zinc-aluminum-magnesium.
Description
Technical Field
The embodiment of the invention relates to the technical field of ferrous metallurgy, in particular to a method for improving the distinctness of image of the surface of a zinc-aluminum-magnesium plate.
Background
At present, steel bases such as domestic wine steel, Tang steel, Bao steel and the like are all producing zinc-aluminum-magnesium coating products, and the zinc-aluminum-magnesium coating products continuously improve the market share due to the excellent performance. However, in recent years, users of automobile panels (painted panels) have fed back that the brightness of the steel sheet on the surface of the zinc-aluminum-magnesium plating layer is reduced, which seriously affects the appearance and use of the steel sheet, and the users cannot accept the high-end O5 sheet materials and color painted substrates. At present, no technology capable of solving the problem of the reduction of the distinctness of image of a steel plate on the surface of a zinc-aluminum-magnesium coating is available.
Therefore, how to develop a method for improving the distinctness of image of the surface of the zinc-aluminum-magnesium plate becomes a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention aims to provide a method for improving the distinctness of image of the surface of a zinc-aluminum-magnesium plate, which can effectively improve the distinctness of image retention capability of the zinc-aluminum-magnesium plate.
In order to achieve the above object, an embodiment of the present invention provides a method for improving the distinctness of image of a surface of a zinc-aluminum magnesium plate, including:
sequentially carrying out heating before rolling, hot rolling, acid washing, cold rolling and annealing treatment on the plate blank to obtain a heat-treated plate;
and sequentially carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than or equal to 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain the hot-dip galvanized aluminum-magnesium coated steel.
Further, the pH value of the alkali liquor is 10-13.
Further, the alkali solution includes at least one of sodium hydroxide, sodium carbonate solution and potassium hydroxide.
Further, the surface pre-oxidation treatment is carried out by adopting alkali liquor with the pH value being more than or equal to 10, and the method specifically comprises the following steps:
adding 20-35% of mass fraction into the water solution in the water quenching tank to obtain alkali liquor with pH value more than or equal to 10.
Further, the temperature of the aqueous solution in the water quenching tank is 20-45 ℃.
Further, the drying temperature is more than or equal to 60 ℃.
Further, the surface treatment comprises finishing treatment and oil coating, and edge purging is performed in the finishing treatment by adopting a distance which is less than or equal to 30cm from the edge.
Further, the running speed of the edge purging is 60-200 mpm.
Further, the cooling speed in the cooling after plating is 50-100 ℃/S.
Further, in the hot dip coating, the chemical components and the mass fractions of the plating solution are as follows: al: 0.7-4%, Mg: 0.4-2%, and the balance of Zn and inevitable impurities.
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 improving the distinctness of image of a zinc-aluminum-magnesium plate surface, which comprises the following steps: sequentially heating, hot rolling, pickling and cold rolling the plate blank before rolling to obtain a cold-rolled plate; annealing the cold-rolled sheet in sequence to obtain a heat-treated sheet; sequentially carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than or equal to 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain hot-galvanized aluminum-magnesium coated steel; the embodiment of the invention discovers that surface zinc oxide (ZnO) and alkaline zinc chloride (Zn) can be formed by carrying out surface pre-oxidation treatment on the zinc-aluminum-magnesium coating in alkaline environment by adopting alkaline liquor with pH being more than or equal to 10 in the continuous production of hot galvanizing5(0H)8Cl2·H2O) and basic zinc aluminum carbonate (Zn)6A12(OH)16CO3·4H2O) and the like, and the existence of the corrosion products can effectively block the transmission of electrons between the plating layer and external substances, thereby improving the corrosion resistance of the plating layer. Meanwhile, new defects or influences on equipment are not caused on the surface of the steel plate, and the method can effectively improve the zinc-aluminum-magnesium distinctness keeping capability through field production experiments and laboratory hot and humid environment experiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing the distinctness of image of the surface of a zinc-aluminum-magnesium plate in example 1;
FIG. 2 is a graph showing the distinctness of image of the surface of a zinc-aluminum-magnesium plate in comparative example 1;
FIG. 3 is a flow chart of a method for improving the distinctness of image of a surface of a Zn-Al-Mg plate according to an embodiment of the present invention;
FIG. 4 is a diagram of O element data processing using peak separation software in example 1 of the present invention;
FIG. 5 is a comparison chart of the results of elemental peak separation processing according to O element in example 1 of the present invention;
FIG. 6 is a graph showing Mg element data processing using peak separation software in example 1 of the present invention;
FIG. 7 is a comparison chart of the element peak processing results according to Mg element in example 1 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the embodiments of the present invention will be more clearly apparent therefrom. It should be understood by those skilled in the art that the detailed description and examples are intended to illustrate, but not limit, the embodiments of 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 embodiments of the invention belong. 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 examples of the present invention are commercially available or can be prepared by an existing method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
according to an exemplary embodiment of the present invention, there is provided a method for improving the distinctness of image of a surface of a zinc-aluminum-magnesium plate, as shown in fig. 3, including:
s1, sequentially carrying out heating before rolling, hot rolling, acid washing, cold rolling and annealing treatment on the plate blank to obtain a heat-treated plate;
as an optional implementation manner, the temperature of the heating before rolling is 1150-1290 ℃, and the time of the heating before rolling is 180-280 mim; the final rolling temperature of the hot rolling is 830-920 ℃. The above parameters are all conventional parameters.
As an optional embodiment, the slab comprises the following chemical components in percentage by mass: c is less than or equal to 0.12; si is less than or equal to 0.50; mn is less than or equal to 0.60; p is less than or equal to 0.10; s is less than or equal to 0.045; ti is less than or equal to 0.30; the component is a conventional component of a zinc-aluminum-magnesium plate;
s2, sequentially carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than or equal to 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain the hot-dip galvanized aluminum-magnesium coated steel.
The embodiment of the invention discovers that surface zinc oxide (ZnO) and alkaline zinc chloride (Zn) can be formed by carrying out surface pre-oxidation treatment on the zinc-aluminum-magnesium coating in alkaline environment by adopting alkaline liquor with pH being more than or equal to 10 in the continuous production of hot galvanizing5(0H)8Cl2·H2O) and basic zinc aluminum carbonate (Zn)6A12(OH)16CO3·4H2O) and the like, and the existence of the corrosion products can effectively block the transmission of electrons between the plating layer and external substances, thereby improving the corrosion resistance of the plating layer. Meanwhile, new defects or influence on equipment are not caused on the surface of the steel plate, and the method can effectively improve the fresh-keeping capacity of the zinc-aluminum-magnesium through on-site production experiments and laboratory hot and humid environment experiments. Microscopic analysis of the surface of the zinc aluminum magnesium plate of example 1, detailed in the examples section, demonstrates that the examples of the invention do produce these corrosion products.
As an alternative embodiment, the pH of the lye is 10 to 13. The zinc-aluminum-magnesium distinctness keeping capability can be effectively improved within the pH value range, and if the pH value is less than 10, the zinc-aluminum-magnesium distinctness keeping capability is not favorably improved; if the pH is more than 13, the transition alkali washing corrosion is liable to cause white rust, since aluminum and magnesium are divalent metals, and thus if the pH is more than 13, the surface flatness and glossiness are affected;
as an alternative embodiment, the lye comprises at least one of sodium hydroxide, sodium carbonate solution and potassium hydroxide. In principle, any alkali solution can be used as long as the pH can be adjusted to a pH of 10 or more.
As an optional embodiment, the surface pre-oxidation treatment with an alkali solution with pH of not less than 10 specifically comprises:
adding 20-35% of alkali stock solution by mass into the aqueous solution in the water quenching tank to obtain alkali solution with pH value more than or equal to 10. The reason for selecting the alkali stock solution with the mass fraction of 20-35 percent is as follows: the coordination of the existing manpower and material resources can be ensured, the water temperature is basically constant, if the mass fraction is less than 20%, the slow regulation and control of the pH value are easily caused by excessive input of manpower and material resources; if the mass fraction is more than 35%, the water temperature is rapidly increased due to too fast heat release of the alkali liquor, so that water vapor is generated in the box body, and the plate surface is easily corroded;
the temperature of the aqueous solution in the water quenching tank is 20-45 ℃. If the temperature is higher than 45 ℃, the strip steel may be slightly white-rusted. If the temperature is lower than 20 ℃, the oxide film is insufficiently reflected, resulting in a decrease in the distinctness of image retaining ability.
In the adding, the specific operation comprises:
preliminarily estimating the experiment ratio according to the actual water storage amount of the water quenching tank in production and the combination of the alkali liquor concentration;
adding alkali liquor into a water quenching tank through an upper adding port before production of transition materials or maintenance starting; attention is paid to the fact that workers who add alkali liquor need to wear labor protection supplies, and meanwhile, mutual protection and joint protection of workers are well done;
detecting the pH value by a pH meter after half an hour through the stirring action of a water quenching sinking roller;
and (4) properly adding alkali liquor by detecting the pH value to ensure the pH value. If the pH value closed-loop control can be realized through electrical equipment, the pH value closed-loop control is more optimal;
as an alternative embodiment, the temperature of the drying is more than or equal to 60 ℃. The surface of the strip steel is favorably and fully dried, and if the drying temperature is lower than 60 ℃, moisture remains to cause the strip steel to slip, so that the surface of the strip steel is easy to scratch;
as an alternative embodiment, the surface treatment includes a finishing treatment and passivation; in the polishing treatment, the edge part is swept in a mode that the distance between the edge part and the edge part is less than or equal to 30cm, so that the moisture on the edge part can be fully eliminated; if the action effect is more than 30cm away from the edge, moisture on the edge is easy to remain, and the strip steel is easy to slip and scratch;
as an alternative embodiment, the edge purge is run at a speed of 60-200 mpm. If the temperature is lower than 60mpm, the surface of the strip steel is easy to rust and white spots due to alkaline cleaning; if the thickness is more than 200mpm, the brightness retaining ability is liable to be lowered;
as an optional embodiment, in the hot dip plating, the chemical composition of the plating solution in mass fraction is: al: 0.7-4%, Mg: 0.4-2%, and the balance of Zn and inevitable impurities. Aluminum in the zinc-aluminum-magnesium coating mainly affects the corrosion resistance and the processability of the coating, and if the aluminum content is too low, the corrosion resistance is seriously deteriorated, and if the aluminum content exceeds 4%, a brittle aluminum-zinc compound intermediate phase appears in the coating, so that the processability is deteriorated. When the content of the magnesium element is less than 0.4% or more than 2%, the blackening defect is liable to occur.
As an alternative embodiment, the cooling rate in the post-plating cooling is 50-100 ℃/S. In the actual production, the cooling speed must reach more than 50 ℃/s to obviously inhibit the segregation and precipitation of the magnesium element from the zinc-rich solid solution; if the cooling rate is too high, thermal stress in the coating is too high, and coating cracking is likely to occur in subsequent use.
From the above, it can be seen that the method for improving the distinctness of image of the surface of the zinc-aluminum-magnesium plate provided by the embodiment of the invention discovers that the surface zinc oxide (ZnO) and the alkaline zinc chloride (Zn) can be formed by performing the surface pre-oxidation treatment on the surface of the zinc-aluminum-magnesium coating in the alkaline environment by using the alkaline solution with the pH of more than or equal to 10 in the hot galvanizing continuous production and performing the surface pre-oxidation treatment on the surface of the zinc-aluminum-magnesium coating in the alkaline environment5(0H)8Cl2·H2O) and basic zinc aluminum carbonate (Zn)6A12(OH)16CO3·4H2O) and the like, and the existence of the corrosion products can effectively block the transmission of electrons between the plating layer and external substances, thereby improving the corrosion resistance of the plating layer. Meanwhile, new defects or influences on equipment are not caused on the surface of the steel plate,through on-site production experiments and laboratory damp and hot environment experiments, the method can effectively improve the fresh-keeping capacity of the zinc-aluminum-magnesium.
A method for improving the distinctness of image of the surface of a zinc-aluminum-magnesium plate according to the present application will be described in detail with reference to examples, comparative examples, and experimental data.
S1, sequentially heating the plate blank before rolling, hot rolling, pickling, cold rolling and annealing to obtain a heat-treated plate;
s2, sequentially carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than or equal to 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain the hot-dip galvanized aluminum-magnesium coated steel.
The process parameters in the examples and comparative examples are different, as shown in table 1, and other process parameters not listed in table 1 are conventional in the art.
TABLE 1 Process parameters
The surface distinctness of image of the obtained Zn-Al-Mg plate is counted, and the result is shown in Table 2.
TABLE 2
From the data in table 2, it can be seen that:
detecting the index delta E (color difference) value of the surface distinctness of image after being placed for 12 hours at the temperature of 30 ℃ and the humidity of more than 60 percent;
in a comparative example 1, no alkali stock solution is added, other process parameters are the same as those of the example 1, and the obtained zinc-aluminum-magnesium plate has the defects of poor distinctness of image retention capability and blackened plate surface;
in a comparative example 2, the pH value of the alkali liquor is 9, which is smaller than the range that the pH value is more than or equal to 10 in the embodiment of the invention, other process parameters are the same as those in the embodiment 1, and the obtained zinc-aluminum-magnesium plate has the defects of poor distinctness of image retention and blackened plate surface;
in a comparative example 3, the drying temperature is 50 ℃ which is less than the range that the drying temperature is more than or equal to 60 ℃ in the embodiment of the invention, other process parameters are the same as those in the embodiment 1, and the obtained zinc-aluminum-magnesium plate has the defects of poor distinctness of image retention and black and rusty part of the plate surface;
in the comparative example 4, the operation speed of edge purging is 50mpm, which is less than the range of 60-200mpm in the embodiment of the invention, and other process parameters are the same as those in the embodiment 1, so that the obtained zinc-aluminum-magnesium plate has the defect of blackening and rusting of part of the plate surface;
in the comparative example 5, the running speed of edge purging is 250mpm which is larger than the range of 60-200mpm in the embodiment of the invention, other process parameters are the same as those in the embodiment 1, and the obtained zinc-aluminum-magnesium plate has the defects of poor distinctness of image retention and blackened plate surface;
in the comparative example 6, the distance between the action effect in the edge purging and the edge is 35cm, which is larger than the range of less than or equal to 30cm in the embodiment of the invention, other process parameters are the same as the embodiment 1, and the obtained zinc-aluminum-magnesium plate has the defects of poor distinctness of image retention capability and blackening and rusting of part of the plate surface;
description of the attached drawings 1-2:
the Zn-Al-Mg plate of comparative example 1 is shown in FIG. 2, which shows that the plate surface of Zn-Al-Mg plate without process modification has poor image retention capability, and the steel plate is obviously blackened in a hot and humid environment for 12 hours.
The zinc-aluminum-magnesium plate of example 1 is shown in FIG. 1, which shows that the treated zinc-aluminum-magnesium plate has a good distinctness of image retention ability.
The surface of the zinc aluminium magnesium plate of example 1 was microscopically analysed:
(1) peak separation according to oxygen element
The distribution of elements in the vicinity of the surface layer after and before the treatment in example 1 was investigated by XPS, and the results are shown in tables 3 and 4, respectively;
TABLE 3 Total elemental analysis of surface positions after treatment
TABLE 4 untreated Normal site elemental complete analysis
The data in tables 3 and 4 were processed using peak separation software as shown in fig. 4 to investigate the difference in surface compound type between the alkaline-washed and untreated normal sites. The results of the peak separation according to the oxygen element are shown in tables 5 and 6, and the elements at the site of the alkali washing treatment in Table 5 are subjected to the peak separation according to O
| Name | Start BE | Peak BE | End BE | Height CPS | FWHM eV | Area(P)CPS.eV |
| O1s O2- | 544.98 | 529.96 | 525.18 | 624.46 | 2.4 | 1626.67 |
| O1s OH- | 544.98 | 531.55 | 525.18 | 3344.34 | 2.21 | 8013.16 |
| O1s H2O | 544.98 | 532.88 | 525.18 | 394.9 | 2.4 | 1028.71 |
TABLE 6 Peak splitting treatment of untreated Normal site elements by O
| Name | Start BE | Peak BE | End BE | Height CPS | FWHM eV | Area(P)CPS.eV |
| O1s O2- | 544.98 | 530.05 | 525.18 | 719.91 | 2.4 | 1875.32 |
| O1s OH- | 544.98 | 531.54 | 525.18 | 3163.15 | 2.13 | 7311.51 |
| O1s H2O | 544.98 | 532.7 | 525.18 | 566.34 | 2.4 | 1475.3 |
As shown in FIG. 5, the results of the element peak separation treatment using O element are compared with each other, and it can be seen that OH, which is the site of the alkali washing treatment, is present-Are higher than the untreated normal position, and H2The amount of O is lower than the untreated normal position. H2The compound corresponding to the O group is MgCO3。
(2) Peak separation according to Mg element
Processing the data according to Mg element by adopting peak separation software as shown in FIG. 6, and performing peak separation according to Mg element, wherein the results are shown in tables 7 and 8;
TABLE 7 Peak separation treatment of alkaline washing treatment position elements according to Mg
TABLE 8 Peak separation treatment of the elements at the normal positions without alkaline washing according to Mg
| Name | Start BE | Peak BE | End BE | Height CPS | FWHM eV | Area(P)CPS.eV |
| Mg1s MgCO3 | 1310.98 | 1305.24 | 1296.18 | 890.46 | 1.15 | 1105.58 |
| Mg1s MgOH2 | 1310.98 | 1302.46 | 1296.18 | 364.54 | 2.4 | 949.63 |
| Mg1s Mg | 1310.98 | 1304.52 | 1296.18 | 3073.82 | 1.72 | 5734.42 |
| Mg1s MgO | 1310.98 | 1304.93 | 1296.18 | 1674.15 | 2.4 | 4361.11 |
As shown in FIG. 7, the results of the peak-splitting treatment performed on Mg elements show that the surface oxidation corrosion products may include Mg, MgO, Mg (OH)2And MgCO3. The quantity of MgO at the alkaline washing treatment position is obviously higher than that at the untreated normal position, and the Mg element is relatively lower. Proves that Mg and the like on the surface are dissolvedCorroding, producing corrosion products.
In conclusion, in the continuous production of hot galvanizing, the surface preoxidation treatment is carried out by adopting alkali liquor with the pH value being more than or equal to 10, the surface of the zinc-aluminum-magnesium coating is preoxidized by the alkaline environment, and the surface zinc oxide (ZnO) and the alkaline zinc chloride (Zn) can be formed really5(0H)8Cl2·H2O) and basic zinc aluminum carbonate (Zn)6A12(OH)16CO3·4H2O), and the like.
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 embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, provided that such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are intended to include such modifications and variations as well.
Claims (4)
1. A method for improving the distinctness of image of a zinc-aluminum-magnesium plate surface, comprising:
sequentially heating, hot rolling, pickling, cold rolling and annealing the plate blank before rolling to obtain a heat-treated plate;
sequentially carrying out hot dip coating, cooling after coating, carrying out surface pre-oxidation treatment by adopting alkali liquor with the pH value of more than 10, drying, carrying out surface treatment and coiling on the heat-treated plate to obtain hot-galvanized aluminum-magnesium coated steel;
the alkali liquor comprises at least one of sodium hydroxide, sodium carbonate solution and potassium hydroxide;
the drying temperature is more than or equal to 60 ℃;
the surface treatment comprises finishing treatment and oil coating, wherein the edge purging is carried out in a mode of keeping the distance from the edge to be less than or equal to 30cm in the finishing treatment;
the running speed of the edge purging is 60-200 mpm;
the cooling speed in the cooling after plating is 50-100 ℃/s;
in the hot dip plating, the chemical components of the plating solution in percentage by mass are as follows: al: 0.7-4%, Mg: 0.4-2%, and the balance of Zn and inevitable impurities.
2. The method for improving the distinctness of image of the surface of a zinc-aluminum-magnesium plate according to claim 1, wherein the pH of the alkaline solution is: the pH value is more than 10 and less than or equal to 13.
3. The method for improving the distinctness of image of a zinc-aluminum-magnesium plate surface according to claim 1, wherein the surface pre-oxidation treatment is performed by alkali solution with pH > 10, and specifically comprises:
adding 20-35% of alkali stock solution by mass into the aqueous solution in the water quenching tank to obtain alkali solution with pH value more than 10.
4. The method of claim 3, wherein the temperature of the aqueous solution in the water quench tank is 20-45 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110475708.2A CN113355621B (en) | 2021-04-29 | 2021-04-29 | Method for improving distinctness of image of zinc-aluminum-magnesium plate surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110475708.2A CN113355621B (en) | 2021-04-29 | 2021-04-29 | Method for improving distinctness of image of zinc-aluminum-magnesium plate surface |
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| CN113355621A CN113355621A (en) | 2021-09-07 |
| CN113355621B true CN113355621B (en) | 2022-07-15 |
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