CN109897990A - Hot-dip aluminum zinc Mg Alloy Coating steel plate and preparation method thereof - Google Patents
Hot-dip aluminum zinc Mg Alloy Coating steel plate and preparation method thereof Download PDFInfo
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- CN109897990A CN109897990A CN201910349778.6A CN201910349778A CN109897990A CN 109897990 A CN109897990 A CN 109897990A CN 201910349778 A CN201910349778 A CN 201910349778A CN 109897990 A CN109897990 A CN 109897990A
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Abstract
The present invention relates to hot-dip aluminum zinc Mg Alloy Coating steel plates and preparation method thereof, belong to hot-dip technical field.Present invention solves the technical problem that being that existing hot-dip aluminum zinc Mg Alloy Coating steel plate can not be while having excellent notch corrosion resistance and forming property with high surface quality.Hot-dip aluminum zinc Mg Alloy Coating steel plate provided by the invention, the chemical component of coating are aluminium 8%~18%, magnesium 0.2%~3.9% by weight percentage, silicon 0.05%~0.35%, remaining is zinc and inevitable impurity, and preparation method includes cleaning by degreasing, continuous annealing, hot-dip are batched.Clad steel sheet of the invention has good corrosion resistance, also has good formability and high surface quality, can be used for the fields such as household electrical appliances, building, communications and transportation.
Description
Technical field
The invention belongs to hot-dip technical fields, and in particular to hot-dip aluminum zinc Mg Alloy Coating steel plate and its preparation side
Method.
Background technique
Zinc-aluminium Mg Alloy Coating steel plate is because having more preferably corrosion resistance, and processed and applied performance (formability, welding of material
Property and coating) it is excellent arouse extensive attention at home and abroad, become the research emphasis of galvanizing by dipping and zn alloy coating professional domain.
Patent document CN103014580A discloses a kind of zinc-aluminum-magnesium clad steel sheet, and Coating composition range is as follows: Al
10.0-16.0%, Mg 2.5-4.0%, Si 0.25-0.75%, Zr 0.2-1.2%, surplus Zn.It is raising in the patent
Corrosion resistance of coating is added to zr element, but it is not only at high cost to add a large amount of zr elements, but also to generate in plating solution more
Slag and bottom ash, cause surface quality to deteriorate, and influence the processing performance in later period.
Patent document CN101812653A discloses a kind of dip galvanized aluminum magnesium silicon rare-earth coated steel strips, the chemistry of coating
Ingredient is as follows: Al 9.9-12.1%, Mg 1.0-1.8%, Si 0.18-0.22%, rare earth 0.01-0.3%, remaining is Zn, should
Patent uses lower Mg content, the corrosion resistance of coating, especially notch corrosion resistance in order to use air as air knife
Not high, furthermore the patent uses air to cause coating surface oxidizable for the gas source of air knife, so that the surface quality of coating is poor, shadow
Ring post-production performance.
Summary of the invention
Present invention solves the technical problem that being that existing hot-dip aluminum zinc Mg Alloy Coating steel plate can not have excellent notch
With high surface quality while corrosion resistance and forming property.
Technical proposal that the invention solves the above-mentioned problems is to provide hot-dip aluminum zinc Mg Alloy Coating steel plate, with weight percent
Chemical component than counting the coating includes aluminium 8%~18%, and magnesium 0.2%~3.9%, silicon 0.05%~0.35%, remaining is
Zinc and inevitable impurity.
Wherein, two-sided coating weight is 40~200g/m2。
Invention additionally discloses the preparation methods of above-mentioned hot-dip aluminum zinc Mg Alloy Coating steel plate, including cleaning by degreasing, continuously
Annealing, hot-dip are batched.
Wherein, cleaning by degreasing includes steel plate ungrease treatment in lye tank (vat) and electrolytic cell, then in the step of potcher cleaning
Suddenly
Further, the control of lye tank (vat) alkali liquid temperature is at 65~90 DEG C, and concentration of lye control is at 60~90 points, electrolyzer electric
Current control is solved in 5000-8000A, 10~25V of voltage, potcher alkalinity is lower than at 10 points, and the drying temperature of strip is not less than 110
℃。
Wherein, continuous annealing process process controls hydrogen >=2.0% in furnace in terms of volumn concentration, and steel plate enters zinc pot temperature
Degree is 480~540 DEG C.
Wherein, hot-dip process control zinc pot temperature is 490~550 DEG C.
Further, control steel plate enters the temperature difference of zinc pot temperature and zinc pot temperature at ± 10 DEG C.
Wherein, hot-dip process uses nitrogen scrape blowing for the gas source of air knife.
Beneficial effects of the present invention:
The present invention has carried out optimization design again to coating chemical component, compared with existing similar clad steel sheet, this hair
It is bright to make hot-dip aluminum zinc Mg Alloy Coating steel plate that there is excellent notch corrosion resistance, add in the case where adding less element species
Work formability, while surface quality is good, can be used as household electrical appliances steel, construction(al)steel uses；Coating of the present invention is without Zr, rare earth etc.
Element, so that bath temperature will not be too high, coating surface quality is excellent, and nitrogen is used scrape blowing for the gas source of air knife, more
The good surface quality that ensure that coating is excellent.
Specific embodiment
The present invention provides hot-dip aluminum zinc Mg Alloy Coating steel plate, by weight percentage the chemical component packet of the coating
Aluminium 8%~18% is included, magnesium 0.2%~3.9%, silicon 0.05%~0.35%, remaining is zinc and inevitable impurity.
It is as follows that the present invention designs the reason of coating chemical component and its content range:
The selection of aluminium content range is mainly in view of coating firstly the need of with sufficiently high corrosion resistance, when aluminium content is too low
Corrosion resistance of coating is poor, but excess of aluminum will lead to coating surface quality difference and processing performance, as welding performance is poor, therefore aluminium
Ingredient is designed as 8%~18%；The addition of magnesium can improve the corrosion resistance of coating and the surface of coating can be made to become bright flat
It is whole, but content of magnesium should not be higher than 4%, as we have found that excessive magnesium, which easily leads to steel matrix, occurs plating leakage phenomenon, to drop
Low coating surface quality, therefore the ingredient of magnesium is designed as 0.2%~3.9%；The addition of silicon enables to coating microstructure more to cause
It is close, so that the corrosion resistance of coating is improved, but the too high levels of silicon can generate surface defect in coating, influence coating surface quality,
Therefore the ingredient of silicon is designed as 0.05%~0.35%.
To sum up, the main chemical compositions of the coating of hot-dip aluminum zinc Mg Alloy Coating steel plate are arranged the present invention are as follows: with weight
Measure percentages aluminium 8%~18%, magnesium 0.2%~3.9%, silicon 0.05%~0.35%, remaining for zinc and inevitably it is miscellaneous
Matter.
Wherein, the two-sided coating weight of steel plate is 40~200g/m2。
The present invention also provides the preparation methods of hot-dip aluminum zinc Mg Alloy Coating steel plate, mainly include cleaning by degreasing, continuous
Annealing, hot-dip, the step of batching.
Wherein, cleaning by degreasing is mainly included in ungrease treatment in lye tank (vat) and electrolytic cell, then in the step of potcher cleaning
Suddenly.
In order to belt steel surface residual in the residues such as the grease that effectively cleans belt steel surface and rinse cycle
Lye tank (vat) alkali liquid temperature can be controlled the concentration of lye control at 65~90 DEG C by lye, while can also save production cost, the present invention
System is at 60~90 points, and electrolytic tank electrolysis current control is lower than at 10 points in 5000-8000A, 10~25V of voltage, potcher alkalinity, band
The drying temperature of steel is not less than 110 DEG C.Wherein, alkali main component used in lye is NaOH and a small amount of surfactant.Point
The free alkalinity referred to, domestic and international steel mill is using " point " as the unit of free alkalinity at present.
It is worth noting that, lye free alkalinity and temperature are higher, then cleaning effect is better, but easily causes residual, residual
Mostly it will cause drifts not to wash clean, so as to cause plating leakage；Electric current and voltage more high residue object are fewer in electrolytic process, but energy consumption
It is bigger；The free alkalinity of potcher is lower, and it is remaining fewer to illustrate the lye of surface of steel plate, to improve the platability of steel plate.
Wherein, hydrogen >=2.0% in continuous annealing process process control furnace, remaining is nitrogen, and steel plate enters zinc pot temperature and is
480~540 DEG C.Hydrogen is as reducibility gas, it is ensured that when high annealing, belt steel surface is not oxidized, to improve steel plate
Surface-active promotes coating adhesion.
Wherein, hot-dip process control zinc pot temperature is 490~550 DEG C.
Further, control steel plate enters the temperature difference of zinc pot temperature and zinc pot temperature at ± 10 DEG C.
Wherein, hot-dip process uses nitrogen scrape blowing for the gas source of air knife.
The present invention will be further explained by the following examples and explanation.
Embodiment 1
The present embodiment by zinc pot plating solution according to coating chemical composition content require control, then according to cleaning by degreasing,
Continuous annealing, hot-dip, the step of batching, obtain hot-dip aluminum zinc Mg Alloy Coating steel plate, specific or immersion parameter such as table
Shown in 1, zinc-aluminum-magnesium coating chemical component is as shown in table 2, and dip galvanized aluminum magnesium coating performance is as shown in table 3.
Embodiment 2
The present embodiment by zinc pot plating solution according to coating chemical composition content require control, then according to cleaning by degreasing,
Continuous annealing, hot-dip, the step of batching, obtain hot-dip aluminum zinc Mg Alloy Coating steel plate, specific or immersion parameter such as table
Shown in 1, zinc-aluminum-magnesium coating chemical component is as shown in table 2, and dip galvanized aluminum magnesium coating performance is as shown in table 3.
Embodiment 3
The present embodiment by zinc pot plating solution according to coating chemical composition content require control, then according to cleaning by degreasing,
Continuous annealing, hot-dip, the step of batching, obtain hot-dip aluminum zinc Mg Alloy Coating steel plate, specific or immersion parameter such as table
Shown in 1, zinc-aluminum-magnesium coating chemical component is as shown in table 2, and dip galvanized aluminum magnesium coating performance is as shown in table 3.
1 zinc-aluminum-magnesium coating or immersion of table
2 zinc-aluminum-magnesium coating chemical component of table
| Embodiment | Al/% | Mg/% | Si/% | Zn/% |
| 1 | 9 | 0.5 | 0.08 | It is remaining |
| 2 | 12 | 1.5 | 0.15 | It is remaining |
| 3 | 16 | 3.0 | 0.25 | It is remaining |
3 dip galvanized aluminum magnesium coating performance of table
The hot-dip aluminum zinc Mg Alloy Coating plate surface quality produced according to above-mentioned technique and functional, in neutrality
There is the heat zinc coating plate for the red rust time being above same coating weight in the time and incision for occurring red rust under the conditions of salt spray test
And hot dip aluminum zinc plate, coating is without peeling after 180 ° of bendings, and without macroscopic crackle, forming property is better than galvanized sheet, as
It is plate surface quality that household electrical appliances use, functional, fully meet user's requirement.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (9)
1. hot-dip aluminum zinc Mg Alloy Coating steel plate, it is characterised in that: the chemical component packet of the coating by weight percentage
Aluminium 8%~18% is included, magnesium 0.2%~3.9%, silicon 0.05%~0.35%, remaining is zinc and inevitable impurity.
2. hot-dip aluminum zinc Mg Alloy Coating steel plate according to claim 1, it is characterised in that: the two-sided coating of steel plate
Weight is 40~200g/m2。
3. the preparation method of hot-dip aluminum zinc Mg Alloy Coating steel plate of any of claims 1 or 2, it is characterised in that including as follows
Step: cleaning by degreasing, continuous annealing, hot-dip are batched.
4. the preparation method of hot-dip aluminum zinc Mg Alloy Coating steel plate according to claim 3, it is characterised in that: described de-
Rouge cleaning includes steel plate ungrease treatment in lye tank (vat) and electrolytic cell, then the step of potcher cleans.
5. the preparation method of hot-dip aluminum zinc Mg Alloy Coating steel plate according to claim 4, it is characterised in that: described de-
For the control of rouge cleaning process lye tank (vat) alkali liquid temperature at 65~90 DEG C, concentration of lye is 60~90 points, Faradaic current 5000-8000A,
10~25V of voltage, potcher alkalinity are lower than at 10 points, and the drying temperature of strip is not less than 110 DEG C.
6. according to the preparation method of the described in any item hot-dip aluminum zinc Mg Alloy Coating steel plates of claim 3~5, feature exists
Control hydrogen >=2.0% in furnace in terms of volumn concentration in: the continuous annealing process, steel plate enter zinc pot temperature be 480~
540℃。
7. according to the preparation method of the described in any item hot-dip aluminum zinc Mg Alloy Coating steel plates of claim 3~6, feature exists
In: the hot-dip process zinc pot temperature is 490~550 DEG C.
8. the preparation method of hot-dip aluminum zinc Mg Alloy Coating steel plate according to claim 7, it is characterised in that: it is described enter
The temperature difference of zinc pot temperature and zinc pot temperature is controlled at ± 10 DEG C.
9. according to the preparation method of the described in any item hot-dip aluminum zinc Mg Alloy Coating steel plates of claim 3~8, feature exists
In: the hot-dip process uses nitrogen scrape blowing for the gas source of air knife.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267037A (en) * | 2020-10-16 | 2021-01-26 | 靖江新舟合金材料有限公司 | Silicon-zinc-containing aluminum magnesium alloy ingot and production method thereof |
| CN112941417A (en) * | 2021-03-03 | 2021-06-11 | 靖江新舟合金材料有限公司 | Alloy coated steel plate and production method thereof |
| CN114411077A (en) * | 2022-01-18 | 2022-04-29 | 辽宁石源科技有限公司 | High-corrosion-resistance stainless steel plated with zinc aluminum or zinc aluminum magnesium alloy and hot-dip plating process |
| CN115558877A (en) * | 2022-09-15 | 2023-01-03 | 首钢集团有限公司 | Zinc-aluminum-magnesium coating and zinc-aluminum-magnesium coating steel plate |
| CN115572931A (en) * | 2022-09-15 | 2023-01-06 | 首钢集团有限公司 | Hot-dip galvanized aluminum-magnesium coated steel and preparation method thereof |
| WO2023238941A1 (en) * | 2022-06-10 | 2023-12-14 | 日本製鉄株式会社 | Hot dip-coated steel sheet |
| WO2023238940A1 (en) * | 2022-06-10 | 2023-12-14 | 日本製鉄株式会社 | Zn-Al-Mg-BASED HOT-DIPPED STEEL SHEET |
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| CN108486415A (en) * | 2018-04-23 | 2018-09-04 | 马钢(集团)控股有限公司 | A kind of preparation method of steel plate and steel plate after dip galvanized aluminum magnesium plating solution and its hot-dip |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267037A (en) * | 2020-10-16 | 2021-01-26 | 靖江新舟合金材料有限公司 | Silicon-zinc-containing aluminum magnesium alloy ingot and production method thereof |
| CN112941417A (en) * | 2021-03-03 | 2021-06-11 | 靖江新舟合金材料有限公司 | Alloy coated steel plate and production method thereof |
| CN114411077A (en) * | 2022-01-18 | 2022-04-29 | 辽宁石源科技有限公司 | High-corrosion-resistance stainless steel plated with zinc aluminum or zinc aluminum magnesium alloy and hot-dip plating process |
| WO2023238941A1 (en) * | 2022-06-10 | 2023-12-14 | 日本製鉄株式会社 | Hot dip-coated steel sheet |
| WO2023238940A1 (en) * | 2022-06-10 | 2023-12-14 | 日本製鉄株式会社 | Zn-Al-Mg-BASED HOT-DIPPED STEEL SHEET |
| JP7486011B2 (en) | 2022-06-10 | 2024-05-17 | 日本製鉄株式会社 | Hot-dip galvanized steel sheet |
| CN115558877A (en) * | 2022-09-15 | 2023-01-03 | 首钢集团有限公司 | Zinc-aluminum-magnesium coating and zinc-aluminum-magnesium coating steel plate |
| CN115572931A (en) * | 2022-09-15 | 2023-01-06 | 首钢集团有限公司 | Hot-dip galvanized aluminum-magnesium coated steel and preparation method thereof |
| CN115572931B (en) * | 2022-09-15 | 2024-08-13 | 首钢集团有限公司 | Hot-dip galvanized aluminum magnesium coated steel and preparation method thereof |
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