CN112048694A - La-Zn thin coating hot-dip galvanized steel strip and preparation method thereof - Google Patents
La-Zn thin coating hot-dip galvanized steel strip and preparation method thereof Download PDFInfo
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- CN112048694A CN112048694A CN202010821217.4A CN202010821217A CN112048694A CN 112048694 A CN112048694 A CN 112048694A CN 202010821217 A CN202010821217 A CN 202010821217A CN 112048694 A CN112048694 A CN 112048694A
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- rare earth
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- 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 La-Zn thin coating hot-dip galvanized steel strip and a preparation method thereof, wherein the preparation method of the La-Zn thin coating hot-dip galvanized steel strip is to carry out hot dip coating on the steel strip in hot dip galvanizing liquid, and the hot dip galvanizing liquid comprises the following components in percentage by mass: al: 0.15-0.55%, rare earth La: 0.001% -0.010%, antimony: 0.007 to 0.01 percent of the alloy steel strip and the balance of Zn, and the La-Zn thin coating hot-dip galvanized steel strip with obviously improved corrosion resistance can be obtained.
Description
Technical Field
The invention belongs to the technical field of hot-dip galvanizing, particularly relates to a La-Zn thin coating hot-dip galvanized steel strip and a preparation method thereof, and particularly relates to a La-Zn thin coating hot-dip galvanized steel strip with high corrosion resistance and a preparation method thereof.
Background
The hot dip galvanizing of the steel surface is a surface treatment method with optimal cost performance for preventing steel corrosion, and is widely applied to the industries of buildings, automobiles, household appliances, energy sources, light industry, petrifaction, electric power, communication and the like. With the rapid development of the industry in recent years, the requirement for the performance of the plating layer is increasing, and the adhesion and corrosion resistance of the zinc plating layer are further required to be improved.
Disclosure of Invention
In view of one or more of the problems of the prior art, the present invention provides a method for manufacturing a La-Zn thin-coated hot-dip galvanized steel strip, comprising the steps of:
1) preparing a La-Zn intermediate alloy: smelting and pouring a pure zinc ingot and mixed or single rare earth with the purity of more than 99.99 percent, wherein the heating temperature is 460-560 ℃, so as to obtain La-Zn intermediate alloy, and the La content in the intermediate alloy is 2-10 percent;
2) preparing hot galvanizing liquid: firstly melting solid zinc, aluminum and antimony with required amounts to obtain a zinc liquid, adding a slag former to stir and slag, and then adding the La-Zn intermediate alloy prepared in the step 1) into the zinc liquid in a multi-point adding mode for heating and melting, wherein the heating temperature is 450-470 ℃ and the time is 30-50min, which is beneficial to effective diffusion of rare earth elements in the zinc liquid, so as to prepare a hot galvanizing liquid, wherein the Al content is 0.15-0.55%, the La content is 0.001-0.010%, the antimony content is 0.007-0.01%, and the balance is Zn;
3) cleaning a steel belt: the alkali washing conductivity is 20-24 ms, the alkali washing temperature is 60-80 ℃, and the washing power is as follows: 30-110 kw, rinsing conductivity of less than 800us, rinsing temperature of 60-80 ℃, and drying temperature of 100-140 ℃;
4) hot dip coating: placing the steel strip cleaned in the step 3) into the hot galvanizing liquid obtained in the step 2) for hot dipping, wherein the temperature of the hot galvanizing liquid is 450-470 ℃, and the dipping time is 5 +/-2 s;
5) passivation straightening: and passivating, straightening and drawing the steel strip after hot dipping, wherein the tension coefficient of the steel strip is controlled to be 1.0-1.2, and the straightening and drawing elongation is 0.2-0.6%.
The La-Zn thin coating hot dip galvanized steel strip prepared by the method also belongs to the content of the invention.
The La-Zn hot galvanizing liquid used for the method also belongs to the content of the invention, and comprises the following components in percentage by mass: al: 0.15-0.55%, rare earth La: 0.001% -0.010%, antimony: 0.007 to 0.01 percent of the total weight of the alloy, and the balance of Zn.
The content of the rare earth La is as follows: 0.002% -0.010%.
The content of the rare earth La is as follows: 0.006 percent.
According to the preparation method of the La-Zn thin coating hot-dip galvanized steel strip, the hot-dip galvanizing liquid containing a proper amount of rare earth element La is used for hot-dip galvanizing the steel strip, the La-Zn thin coating hot-dip galvanized steel strip with improved corrosion resistance can be obtained, the method is stable in process, and La-Zn intermediate alloy is added in a multi-point adding mode in the hot-dip galvanizing liquid preparation process, so that rare earth element diffusion is facilitated.
The results of the examples show that: the added rare earth La has better effect on the corrosion resistance and the high temperature resistance of the plating layer, and a small amount of rare earth can effectively reduce the surface tension of the plating solution, improve the wettability of zinc solution and a steel matrix and eliminate the pinhole bare point which is easily generated during dip plating of the plating solution. And the rare earth La can purify impurities and refine grains, can be enriched on the surface of the bond layer to form a compact and uniform oxide film, and can prevent external impurity atoms from diffusing into the alloy to a certain extent, so that the oxidation and corrosion processes are delayed. In addition, in the process of preparing the hot galvanizing liquid, the rare earth elements enriched on the surface layer of the plating liquid have better protection effect on the surface of the plating liquid, and the formation of scum can be reduced. And when a certain amount of rare earth is added into the zinc bath, the brightness of the hot-dip galvanized layer can be obviously improved, the corrosion resistance of the zinc plating surface is improved by more than 1 time, the viscosity of the zinc liquid is reduced, the adhesive force of zinc is enhanced, the plating layer can be thinned by at least 20 percent, and the cost is reduced.
Detailed Description
The invention aims to provide a La-Zn thin coating hot-dip galvanized steel strip with improved corrosion resistance and a preparation method thereof.
The preparation method of the La-Zn thin coating hot-dip galvanized steel strip comprises the following steps:
1) preparing a La-Zn intermediate alloy: smelting and pouring a pure zinc ingot and mixed or single rare earth with the purity of more than 99.99 percent, wherein the heating temperature is 460-560 ℃, so as to obtain La-Zn intermediate alloy, and the La content in the intermediate alloy is 2-10 percent;
2) preparing hot galvanizing liquid: firstly melting solid zinc, aluminum and antimony with required amounts to obtain a zinc liquid, adding a slag former to stir and slag, and then adding the La-Zn intermediate alloy prepared in the step 1) into the zinc liquid in a multi-point adding mode for heating and melting, wherein the heating temperature is 450-470 ℃ and the time is 30-50min, which is beneficial to effective diffusion of rare earth elements in the zinc liquid, so as to prepare a hot galvanizing liquid, wherein the Al content is 0.15-0.55%, the La content is 0.001-0.010%, the antimony content is 0.007-0.01%, and the balance is Zn;
3) cleaning a steel belt: the alkali washing conductivity is 20-24 ms, the alkali washing temperature is 60-80 ℃, and the washing power is as follows: 30-110 kw, rinsing conductivity of less than 800us, rinsing temperature of 60-80 ℃, and drying temperature of 100-140 ℃;
4) hot dip coating: placing the steel strip cleaned in the step 3) into the hot galvanizing liquid obtained in the step 2) for hot dipping, wherein the temperature of the hot galvanizing liquid is 450-470 ℃, and the dipping time is 5 +/-2 s; and after the hot dipping is finished, flattening the steel strip under the conditions that the air knife pressure is 9-40 kpa and the air knife interval is 22-40 mm, wherein the speed of the steel strip is 60-100 m/min.
5) Passivation straightening: and passivating, straightening and drawing the steel strip after hot dipping, wherein the tension coefficient of the steel strip is controlled to be 1.0-1.2, and the straightening and drawing elongation is 0.2-0.6%.
The hot galvanizing solution comprises the following components in percentage by mass: 0.15-0.55% of Al, 0.001-0.010% of rare earth La, 0.007-0.01% of antimony and the balance of Zn.
The present invention will be described in detail below with reference to specific examples, which are intended to facilitate understanding of the present invention and are not intended to limit the present invention.
Hot dip coating a steel strip (for example, SGCC steel strip) with a coating thickness of 4-10 μm by using the hot dip coating prepared by the above method according to the components listed in table 1 below, and then performing a corrosion resistance salt spray corrosion test on the hot dip coated product, the specific test results of which are shown in table 2 below.
Table 1: chemical composition and content (%)
| Examples | Al | La | Sb |
| Example 1 | 0.45 | - | 0.007 |
| Example 2 | 0.27 | 0.001 | 0.007 |
| Example 3 | 0.15 | 0.002 | 0.010 |
| Example 4 | 0.54 | 0.006 | 0.009 |
| Example 5 | 0.22 | 0.010 | 0.010 |
Table 2: results of corrosion resistance test of hot-dip coated steel strips of examples 1 to 5
As shown in the above tables 1 and 2, the corrosion resistance of the steel strip coating can be remarkably improved and the thickness of the coating can be effectively reduced by at least 20% by adding a proper amount of rare earth element La (0.001-0.010%, preferably 0.002-0.010%) into the hot galvanizing solution. Meanwhile, according to the results in table 2, it can be seen that the La content in examples 4 and 5 is 0.006% and 0.010%, respectively, but the corrosion resistance of the La content and the corrosion resistance of the La content are equivalent, so that in consideration of cost, the content of the rare earth element La in the hot galvanizing solution is preferably about 0.006%, not only can a good corrosion resistance effect of the plating layer be obtained, but also the thickness of the plating layer can be reduced, and the cost can be effectively reduced, so that a better comprehensive effect can be obtained.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for producing a thin La-Zn coated hot dip galvanized steel strip, comprising the steps of:
1) preparing a La-Zn intermediate alloy: smelting and pouring a pure zinc ingot and mixed or single rare earth with the purity of more than 99.99 percent, wherein the heating temperature is 460-560 ℃, so as to obtain La-Zn intermediate alloy, and the La content in the intermediate alloy is 2-10 percent;
2) preparing hot galvanizing liquid: firstly melting solid zinc, aluminum and antimony with required amounts to obtain a zinc liquid, adding a slag former to stir and slag, and then adding the La-Zn intermediate alloy prepared in the step 1) into the zinc liquid to be heated and melted, wherein the heating temperature is 450-470 ℃ and the time is 30-50min, so as to prepare a hot galvanizing liquid, wherein the Al content is 0.15-0.55%, the rare earth La content is 0.001-0.010%, the antimony content is 0.007-0.01%, and the balance is Zn;
3) cleaning a steel belt: the alkali washing conductivity is 20-24 ms, the alkali washing temperature is 60-80 ℃, and the washing power is as follows: 30-110 kw, rinsing conductivity of less than 800us, rinsing temperature of 60-80 ℃, and drying temperature of 100-140 ℃;
4) hot dip coating: placing the steel strip cleaned in the step 3) into the hot galvanizing liquid obtained in the step 2) for hot dipping, wherein the temperature of the hot galvanizing liquid is 450-470 ℃, and the dipping time is 5 +/-2 s;
5) passivation straightening: and passivating, straightening and drawing the steel strip after hot dipping, wherein the tension coefficient of the steel strip is controlled to be 1.0-1.2, and the straightening and drawing elongation is 0.2-0.6%.
2. A La-Zn flash coated hot dip galvanized steel strip produced by the method of claim 1.
3. La-Zn hot-dip galvanizing bath used in the method of claim 1, comprising the following components in percentage by mass: al: 0.15-0.55%, rare earth La: 0.001% -0.010%, antimony: 0.007 to 0.01 percent of the total weight of the alloy, and the balance of Zn.
4. The La-Zn hot-dip galvanizing bath according to claim 3, wherein the content of the rare earth La is: 0.002% -0.010%.
5. The La-Zn hot-dip galvanizing bath according to claim 4, wherein the content of the rare earth La is: 0.006 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010821217.4A CN112048694A (en) | 2020-08-14 | 2020-08-14 | La-Zn thin coating hot-dip galvanized steel strip and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262856A (en) * | 2021-12-23 | 2022-04-01 | 新疆八钢佳域工业材料有限公司 | Production method of zinc-aluminum alloy suitable for hot-dip galvanized steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262856A (en) * | 2021-12-23 | 2022-04-01 | 新疆八钢佳域工业材料有限公司 | Production method of zinc-aluminum alloy suitable for hot-dip galvanized steel pipe |
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