CN111155044A - A method for improving the surface quality of zinc-aluminum-magnesium coated steel, zinc-aluminum-magnesium coating - Google Patents
A method for improving the surface quality of zinc-aluminum-magnesium coated steel, zinc-aluminum-magnesium coating Download PDFInfo
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- CN111155044A CN111155044A CN201911299083.8A CN201911299083A CN111155044A CN 111155044 A CN111155044 A CN 111155044A CN 201911299083 A CN201911299083 A CN 201911299083A CN 111155044 A CN111155044 A CN 111155044A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- -1 zinc-aluminum-magnesium Chemical compound 0.000 title claims abstract description 49
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 238000000576 coating method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 33
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 20
- 239000011701 zinc Substances 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 38
- 238000010583 slow cooling Methods 0.000 claims description 23
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims 2
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 claims 2
- 230000005496 eutectics Effects 0.000 abstract description 21
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910018134 Al-Mg Inorganic materials 0.000 description 2
- 229910018467 Al—Mg Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 208000012868 Overgrowth Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- 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
本发明涉及一种提高锌铝镁镀层钢表面质量的方法，属于轧钢技术领域，本发明提供的提高锌铝镁镀层钢表面质量的方法，所述锌铝镁镀层钢包括钢基体和镀层，所述镀层化学成分包括Al和Mg；按重量百分比计，所述Al含量为1.5‑2.0％，所述Mg与所述Al的质量比为1.2‑1.6∶1.5‑2.0，所述钢基体入锌锅的温度≥470℃，采用本发明实施例提供的提高锌铝镁镀层钢表面质量的方法，可降低镀层组织中共晶组织的占比，使镀层组织中共晶组织的体积百分比≤30％，同时，可使镀层组织中共晶组织的形态呈网状分布。
The invention relates to a method for improving the surface quality of zinc-aluminum-magnesium coated steel, belonging to the technical field of steel rolling. The invention provides a method for improving the surface quality of zinc-aluminum-magnesium coated steel. The zinc-aluminum-magnesium coated steel comprises a steel matrix and a coating, and the The chemical composition of the coating layer includes Al and Mg; by weight percentage, the Al content is 1.5-2.0%, the mass ratio of the Mg to the Al is 1.2-1.6:1.5-2.0, and the steel substrate is placed in a zinc pot If the temperature is ≥470°C, the method for improving the surface quality of zinc-aluminum-magnesium coated steel provided by the embodiment of the present invention can reduce the proportion of the eutectic structure of the coating structure, so that the volume percentage of the eutectic structure of the coating structure is less than or equal to 30%, and at the same time, The morphology of the eutectic structure of the coating structure can be distributed in a network.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for improving the surface quality of zinc-aluminum-magnesium coated steel.
Background
The zinc-aluminum-magnesium coated steel comprises coated steel with certain amount of Al and Mg elements added in the existing hot galvanizing coating, and has the characteristics of high corrosion resistance and high edge cutting protection performance. The zinc-aluminum-magnesium coated steel has the problem of poor surface quality because the plating solution of the zinc-aluminum-magnesium coated steel contains elements such as Al, Mg and the like.
Disclosure of Invention
In view of the above, the present invention has been made to provide a method for improving the surface quality of zinc aluminum magnesium coated steel that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a method for improving the surface quality of zinc-aluminum-magnesium coated steel, wherein the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical components of the coating comprise Al and Mg; according to the weight percentage, the Al content is 1.5-2.0%, the mass ratio of Mg to Al is 1.2-1.6: 1.5-2.0, and the temperature of the steel matrix entering a zinc pot is more than or equal to 470 ℃.
Further, when the coating is coated, the temperature of the zinc pot is controlled to be 460-470 ℃.
Further, after the steel substrate passes through the air knife, slow cooling and fast cooling are sequentially carried out.
Further, the slow cooling is carried out by adopting a gap type movable cooling device.
Further, the cooling speed of slow cooling is 5-7 ℃/s.
Further, the temperature is slowly cooled to 330-370 ℃.
Further, the slow cooling is performed by adopting a round hole type movable cooling device.
Further, the cooling speed of the rapid cooling is 10-15 ℃/s.
Further, the fast cooling is carried out to a temperature of 180-220 ℃.
Based on the same inventive concept, the embodiment of the invention also provides a zinc-aluminum-magnesium coating.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. by adopting the method for improving the surface quality of the zinc-aluminum-magnesium coated steel, the proportion of eutectic structures in the coating structure can be reduced, and the volume percentage of the eutectic structures in the coating structure is less than or equal to 30%.
2. By adopting the method for improving the surface quality of the zinc-aluminum-magnesium coated steel, provided by the embodiment of the invention, the form of the eutectic structure in the coating structure can be distributed in a net shape.
3. Through the effects of the steps 1 and 2, the purpose of improving the surface quality of the zinc-aluminum-magnesium coated steel is further achieved.
4. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel provided by the embodiment of the invention has the advantages of simple method, easiness in operation and low cost.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a microscopic view of the coating structure of a zinc-aluminum-magnesium coated steel according to an example of the present invention;
FIG. 2 is a microscopic view of the coating structure of a prior art Zn-Al-Mg coated steel;
FIG. 3 is a distribution diagram of coating elements of a zinc-aluminum-magnesium coated steel according to an embodiment of the present invention;
FIG. 4 is a coating structure view of a zinc-aluminum-magnesium coated steel in an embodiment of the present invention;
FIG. 5 is a photograph of a stroboscopic lamp showing the surface of a Zn-Al-Mg coated steel in an embodiment of the present invention;
FIG. 6 is a photograph of a prior art stroboscopic lamp for a zinc-aluminum-magnesium coated steel surface.
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 the embodiment, the method for improving the surface quality of the zinc-aluminum-magnesium coated steel is provided, the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical composition of the coating comprises Al and Mg; according to the weight percentage, the Al content is 1.5-2.0%, the mass ratio of Mg to Al is 1.2-1.6: 1.5-2.0, and the temperature of the steel matrix entering a zinc pot is more than or equal to 470 ℃.
The typical structure of the coating structure of the zinc-aluminum-magnesium coating steel is composed of three phases, namely a pure zinc phase, a MgZn binary eutectic phase and a ZnAlMg ternary eutectic phase. The change of the coating structure can cause the change of the surface quality of the product, so that the optimal control of the coating structure is the key for obtaining the zinc-aluminum-magnesium coating product with high surface quality. The volume percentage of the eutectic structure in the coating structure is reduced, the form of the eutectic structure in the coating structure is distributed in a net shape, and the coating structure can be optimally controlled, so that the surface quality of the zinc-aluminum-magnesium coated steel is improved.
By adopting the technical scheme, the liquid metal component is closer to the ternary eutectic component by controlling the component proportion of Al and Mg elements, so that the overgrowth of a secondary eutectic phase is avoided, and the proportion of the eutectic phase is integrally controlled. After the strip steel passes through the air knife, the strip steel is cooled at a low speed, so that favorable conditions can be created for the growth of pure zinc phase pre-eutectic structures, and the proportion of pre-eutectic zinc phases is increased. By controlling the composition and the cooling rate, a good effect can be obtained.
In this embodiment, the temperature of the zinc pot is controlled to be 460-.
By adopting the technical scheme, enough time can be obtained for the growth of the eutectic pure zinc phase.
In this embodiment, after passing through the air knife, the steel substrate is gradually cooled and rapidly cooled in sequence.
By adopting the technical scheme, enough time can be obtained for the growth of the eutectic pure zinc phase, and the temperature of the strip steel to the top roller of the tower is ensured to be lower than 220 ℃.
In this embodiment, the slow cooling is performed by using a slit-type movable cooling device.
By adopting the technical scheme, the cooling speed can be ensured to be slow.
In this embodiment, the cooling rate of the slow cooling is 5-7 ℃/s.
By adopting the technical scheme, enough time can be obtained for the growth of the eutectic pure zinc phase
In this embodiment, the slow cooling is performed to a temperature of 330-.
By adopting the technical scheme, enough time can be obtained for the growth of the eutectic pure zinc phase.
In this embodiment, the slow cooling is performed by using a round hole type movable cooling device.
By adopting the technical scheme, higher cooling speed can be obtained.
In this embodiment, the cooling rate of the rapid cooling is 10-15 ℃/s.
By adopting the technical scheme, the temperature of the strip steel to the tower top roller can be ensured to be lower than 220 ℃.
In this embodiment, the fast cooling temperature is 180-.
By adopting the technical scheme, the temperature of the strip steel to the tower top roller can be ensured to be lower than 220 ℃.
Based on the same inventive concept, the embodiment also provides a zinc-aluminum-magnesium coating.
By adopting the technical scheme, the volume percentage of eutectic structures in the coating structure can be ensured to be less than or equal to 30 percent, and the zinc-aluminum-magnesium product with good surface quality is obtained.
The method for improving the surface quality of the zinc-aluminum-magnesium plated steel of the present application will be described in detail with reference to specific examples.
The method provided by the embodiment of the invention is particularly suitable for producing the zinc-aluminum-magnesium automobile plate with the surface grade requirement of the automobile inner plate, and the following embodiment provides the production of the hot-galvanized DX54D + ZM hot-galvanized aluminum-magnesium steel with the thickness of 0.7mm and the width of 1850 mm.
Example 1
According to the method for improving the surface quality of the zinc-aluminum-magnesium coated steel, the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical components of the coating comprise Al and Mg; according to the weight percentage, the Al content is 1.7 percent, the mass ratio of Mg to Al is 2: 3, and the temperature of the steel matrix entering a zinc pot is 473 ℃.
Specifically, when the coating is coated, the temperature of the zinc pot is controlled to be 465 ℃.
Specifically, after passing through the air knife, the steel substrate is gradually cooled and rapidly cooled in sequence.
Specifically, the slow cooling adopts a gap type movable cooling device to perform nitrogen injection.
Specifically, the slow cooling speed is 6-7 ℃/s.
Specifically, the slow cooling is carried out until the temperature is 330-340 ℃.
Specifically, the slow cooling is performed by using a round hole type movable cooling device.
Specifically, the cooling speed of the rapid cooling is 12-15 ℃/s.
Specifically, the rapid cooling temperature is 180-.
Example 2
According to the method for improving the surface quality of the zinc-aluminum-magnesium coated steel, the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical components of the coating comprise Al and Mg; according to the weight percentage, the Al content is 1.5 percent, the mass ratio of Mg to Al is 1.2: 1.7, and the temperature of the steel matrix entering a zinc pot is 470 ℃.
Specifically, when the coating is coated, the temperature of the zinc pot is controlled to be 460 ℃.
Specifically, after passing through the air knife, the steel substrate is gradually cooled and rapidly cooled in sequence.
Specifically, the slow cooling is performed by nitrogen injection by adopting a gap type movable cooling device.
Specifically, the slow cooling speed is 6 ℃/h.
Specifically, the temperature is slowly cooled to 350 ℃.
Specifically, the slow cooling is performed by using a round hole type movable cooling device.
Specifically, the cooling speed of the rapid cooling is 12 ℃/h.
Specifically, the rapid cooling temperature is 210 ℃.
Example 3
According to the method for improving the surface quality of the zinc-aluminum-magnesium coated steel, the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical components of the coating comprise Al and Mg; according to the weight percentage, the Al content is 1.5-2.0%, the mass ratio of Mg to Al is 1.2-1.6: 1.5-2.0, and the temperature of the steel matrix entering a zinc pot is set as follows.
Specifically, when the coating is coated, the temperature of the zinc pot is controlled to be 470 ℃.
Specifically, after passing through the air knife, the steel substrate is gradually cooled and rapidly cooled in sequence.
Specifically, the slow cooling adopts a gap type movable cooling device to perform nitrogen injection.
Specifically, the slow cooling speed is 7 ℃/h.
Specifically, the temperature is slowly cooled to 340 ℃.
Specifically, the slow cooling is performed by using a round hole type movable cooling device.
Specifically, the cooling speed of the rapid cooling is 12 ℃/h.
Specifically, the rapid cooling is carried out until the temperature is 200 ℃.
Experimental example 1
The surface quality of the zinc-aluminum-magnesium plated steel prepared in examples 1 to 3 was measured by a scanning electron microscope, and the results are shown in table 1.
TABLE 1
| Surface eutectic phase area ratio | |
| Example 1 | 22％ |
| Example 2 | 24％ |
| Example 3 | 24％ |
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. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel is characterized in that the zinc-aluminum-magnesium coated steel comprises a steel substrate and a coating, and the chemical components of the coating comprise Al and Mg; according to the weight percentage, the Al content is 1.5-2.0%, the mass ratio of Mg to Al is 1.2-1.6: 1.5-2.0, and the temperature of the steel matrix entering a zinc pot is more than or equal to 470 ℃.
2. The method as claimed in claim 1, wherein the temperature of the zinc pot is controlled to be 460-470 ℃ during the coating.
3. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel according to claim 1, wherein the steel substrate is subjected to slow cooling and fast cooling in sequence after passing through the air knife.
4. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel according to claim 3, wherein the slow cooling is performed by using a slot type moving cooling device.
5. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel according to claim 3, wherein the slow cooling is performed at a cooling rate of 5-7 ℃/s.
6. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel as claimed in any one of claims 3 to 5, wherein the slow cooling temperature is 330-370 ℃.
7. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel according to claim 3, wherein the slow cooling is performed by using a round hole type movable cooling device.
8. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel according to claim 3, wherein the cooling speed of the rapid cooling is 10-15 ℃/s.
9. The method for improving the surface quality of the zinc-aluminum-magnesium coated steel as claimed in any one of claims 3 and 7 to 8, wherein the temperature of the rapid cooling is 180-220 ℃.
10. A zinc aluminium magnesium coating produced by the method of improving the surface quality of zinc aluminium magnesium coated steel as claimed in any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113373393A (en) * | 2021-05-17 | 2021-09-10 | 唐山钢铁集团高强汽车板有限公司 | Production method of zinc-aluminum-magnesium coated strip steel |
| CN116287865A (en) * | 2023-02-17 | 2023-06-23 | 马鞍山钢铁股份有限公司 | Zinc-aluminum-magnesium plated steel plate with high crack resistance and production method thereof |
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