CN109898045A - Dip galvanized aluminum magnesium clad steel sheet and preparation method thereof - Google Patents
Dip galvanized aluminum magnesium clad steel sheet and preparation method thereof Download PDFInfo
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- CN109898045A CN109898045A CN201910258696.0A CN201910258696A CN109898045A CN 109898045 A CN109898045 A CN 109898045A CN 201910258696 A CN201910258696 A CN 201910258696A CN 109898045 A CN109898045 A CN 109898045A
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Abstract
The invention discloses a kind of dip galvanized aluminum magnesium clad steel sheets, belong to hot-dip technical field, and the steel plate includes substrate and coating, the chemical composition mass percentage distribution ratio of the coating are as follows: aluminium 18~26%, magnesium 0.5~3.5%, silicon 0.05~0.25%, remaining is zinc and inevitable impurity.The clad steel sheet prepared not only has a good corrosion resistance and excellent notch corrosion resistance under present invention proportion, and coating surface quality and has excellent formability, and fully meets high quality household electrical appliances steel and automobile steel；In addition, production cost, practical strong operability can also be saved using preparation process of the invention.
Description
Technical field
The invention belongs to hot-dip technical fields, and in particular to a kind of dip galvanized aluminum magnesium clad steel sheet and its preparation side
Method.
Background technique
With the development of steel material and coating technology, hot-dip galvanizing sheet steel and hot-dip coating aluminium-zinc alloy clad steel sheet are extensive
Applied to industries such as building, automobile and cautious manufactures.Since hot-dip galvanizing sheet steel and hot-dip coating aluminium-zinc alloy clad steel sheet are severe
The abrasion resistance properties of corrosion resistance and coating under environment are poor, further apply to limit it.
CN108018513A discloses a kind of dip galvanized aluminum magnesium clad steel sheet and its manufacturing method, coating chemical component
It is as follows: Al 0.15%-6.5%, Mg 0.2%-7%, RE≤0.2%, Sr 0.002%-0.2%, surplus be Zn and other not
Evitable impurity, and the chemical component of the coating also meets Mg/Al > 1.0.Above-mentioned zinc-aluminum-magnesium clad steel sheet it is anti-corrosion
Property is poor, it is difficult to meet the high corrosion-resistant requirement of construction(al)steel and household electrical appliances steel.
CN109112453A discloses a kind of zinc-aluminum-magnesium clad steel sheet and its manufacturing method, thermoforming process and component,
Coating chemical component is as follows: Al 1.5~9.0%, Mg 1.0~3%, Si≤0.50%, Ti≤0.50%, Sb≤0.50%,
Cu≤2.00%, Re≤0.10%, Mn≤3.0%, Ca≤1.00%, Sn≤0.50%；Remaining is Zn, and Al/Mg > 1.0.
There is the various trace elements such as Sn, RE, Sb, Ti, the Ca added in the coating of above-mentioned zinc-aluminum-magnesium clad steel sheet association control to require,
Practical smelting control difficulty is big, and the operability in production process is low, high production cost.
CN105256196A discloses a kind of aluminium zinc-magnesium clad steel sheet and preparation method thereof, and coating chemical component is as follows:
50~60% aluminium, 1~4% magnesium, 1~2% silicon, surplus are zinc.Above-mentioned aluminium zinc-magnesium clad steel sheet in order to improve corrosion resistance and substantially
The dosage for improving aluminium is not suitable for reduce the formability of coating in household electrical appliances and automotive field application.
Summary of the invention
Present invention solves the technical problem that are as follows: the corrosion resistance and formability of existing zinc-aluminum-magnesium clad steel sheet and its notch are poor.
The technical solution of present invention solution above-mentioned technical problem are as follows: provide a kind of dip galvanized aluminum magnesium clad steel sheet, wrap
Include substrate and coating, the chemical composition mass percentage distribution ratio of the coating are as follows: aluminium 18~26%, magnesium 0.5~3.5%, silicon 0.05
~0.25%, remaining is zinc and inevitable impurity.
Further, above-mentioned dip galvanized aluminum magnesium clad steel sheet, the chemical composition mass percentage distribution ratio of the coating are as follows: aluminium
21~25%, magnesium 1.5~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity.
The present invention also provides the preparation methods of above-mentioned dip galvanized aluminum magnesium clad steel sheet, comprising the following steps: degreasing is clear
It washes, anneal, hot-dip, cooling, batching.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, in the cleaning by degreasing, the temperature in lye tank (vat)
Be 65~90 DEG C, lye tank (vat) free alkalinity be 60~90 points, electrolytic tank electrolysis electric current be 5000~8000A, voltage be 10~
25V；The free alkalinity of rinse bath is lower than at 10 points.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, the drying temperature of steel plate after the cleaning by degreasing
Not less than 110 DEG C.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, the atmosphere of the annealing are nitrogen and hydrogen,
The percentage by volume 2.0~10% of middle hydrogen.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet in the hot-dip, enters zinc pot front spring temperature
It is 520~560 DEG C.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, in the hot-dip, the composition quality hundred of plating solution
Score is aluminium 18~26%, and magnesium 0.5~3.5%, silicon 0.05~0.25%, remaining is zinc and inevitable impurity；Zinc pot
Temperature is 530~570 DEG C.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, in the hot-dip, the composition quality hundred of plating solution
Score is aluminium 21~25%, and magnesium 1.5~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity.
Wherein, the preparation method of above-mentioned dip galvanized aluminum magnesium clad steel sheet, the weight of the coating are 40~200g/m2。
Compared with prior art, the beneficial effects of the present invention are:
The clad steel sheet prepared under present invention proportion not only has good corrosion resistance and excellent notch corrosion resistance,
And it coating surface quality and has excellent formability, fully meets high quality household electrical appliances steel and automobile steel；In addition, using this hair
Bright preparation process can also save production cost, practical strong operability.
Specific embodiment
Specifically, a kind of dip galvanized aluminum magnesium clad steel sheet, including substrate and coating, the chemical component quality of the coating
Per distribution ratio are as follows: aluminium 18~26%, magnesium 0.5~3.5%, silicon 0.05~0.25%, remaining is zinc and inevitable impurity.
Further, above-mentioned dip galvanized aluminum magnesium clad steel sheet, the chemical composition mass percentage distribution ratio of the coating are as follows: aluminium
21~25%, magnesium 1.5~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity.
Corrosion resistance of coating is poor when aluminium content is too low, but to will lead to coating surface quality poor for excess of aluminum, and can reduce plating
Layer formability, in order to guarantee the existing good corrosion resistance of zinc-aluminium Mg Alloy Coating steel plate, and have good formability, need by
The content of aluminium is controlled 18%~26%, preferably 21~25%.
The addition of magnesium can improve the corrosion resistance of coating and the surface of coating becomes bright smooth, but when the content of magnesium is super
When 4%, magnesium can accelerate the oxidation of zinc, increase zinc liquid surface zinc gray, while plating leakage phenomenon, therefore magnesium can occur for steel matrix
Ingredient be designed as 0.5%~3.5%, preferably 1.5~3%.
The present invention, which increases silicon (0.15~0.25%), can inhibit the growth of Mg-Al-Zn-Fe intermediate alloy phase, make coating
With good adhesion, make it that there is good formability in punch forming.Its range is the forming according to it to coating
Property etc. the influences of performances determine, it is when being lower than 0.05%, unobvious to the function and effect of intermediate alloy phase, may cause
Coating is easy to fall off, the problem of formability difference.
The present invention also provides the preparation methods of above-mentioned dip galvanized aluminum magnesium clad steel sheet, comprising the following steps: degreasing is clear
It washes, anneal, hot-dip, cooling, batching.
In cleaning by degreasing step, the free alkalinity and temperature of lye are higher, then cleaning effect is better, but be easy to cause
Residual, the residual the more, rinsed clean are not easy, so as to cause plating leakage；Electric current and voltage more high residue object are fewer in electrolytic process,
But energy consumption is bigger.Therefore, it is remained in order to effectively clean belt steel surface in the residues such as belt steel surface grease and rinse cycle
Lye while in order to save production cost be 65~90 DEG C by the temperature in lye tank (vat), the free alkalinity of lye is 60~90
Point；Electrolytic tank electrolysis electric current is 5000~8000A, and voltage is 10~25V；The free alkalinity of potcher is lower than at 10 points.
Free alkalinity points: taking 10ml degreaser in conical flask with pipette, and 4~5 drop phenolphthalein indicators, solution is added
Pinkiness, being titrated to when solution becomes colorless with 0.1mol/L hydrochloric acid standard solution is terminal, the volume of consumed titrating solution
Number (ml) is free alkalinity points.For example, the 0.1mol/L hydrochloric acid of 10ml degreaser consumption 70ml, the i.e. free alkali of degreaser
Degree is 70 points.
In preparation method of the present invention, the drying temperature of steel plate is not less than 110 DEG C after the cleaning by degreasing.
In preparation method of the present invention, annealing temperature and time determine according to specific steel grade in the prior art；The gas of annealing
Atmosphere is nitrogen and hydrogen, and when to guarantee high annealing, belt steel surface is not oxidized, to improve surface of steel plate activity, promotes plating
The adhesive force of layer, meanwhile, to guarantee that annealing safety, the percentage by volume of hydrogen are set as 2.0~10%.
In preparation method of the present invention, in the hot-dip, entering zinc pot front spring temperature is 520~560 DEG C.
In preparation method of the present invention, in the hot-dip, the composition quality percentage of plating solution is aluminium 21~25%, magnesium 1.5
~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity；In order to guarantee that each ingredient is completely in molten
The temperature of zinc pot is set as 530~570 DEG C by state.
In preparation method of the present invention, in the hot-dip, the composition quality percentage of plating solution is aluminium 21~25%, magnesium 1.5
~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity.
In preparation method of the present invention, after hot-dip, blower is first used in belt steel surface, to turn to air blown first
Belt steel temperature is down to 300~350 DEG C before roller, strip is then cooled to room temperature in cooling tower.
In preparation method of the present invention, coating weight is the key factor for influencing corrosion resistance coating, and coating weight is too low, then
Corrosion resistance is poor, too high to be then unable to control in production, therefore the weight of coating is 40~200g/m2(two-sided) Shi Xiaoguo is most
It is good.
A specific embodiment of the invention is further described below with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
The neutral salt spray test of following embodiments is carried out according to GB/T10125-2012.The curved test condition of 0T: it will plate
Layer sample bending, Bend diameter d=0, then the coating morphology of bending part is observed in bent angle alpha=180 °.
Embodiment 1
Hot-dip aluminum zinc Mg Alloy Coating steel plate, the chemical composition mass percentage distribution ratio of coating are as follows: aluminium 18%, magnesium
0.5%, silicon 0.05%, remaining is zinc and inevitable impurity.
Preparation method: steel plate is annealed after cleaning by degreasing, is then carried out cooling down after hot-dip again, be batched up to plating
Zinc-aluminium Mg Alloy Coating steel plate.
Cleaning by degreasing technique are as follows: tank liquor temperature need to be controlled at 70 DEG C, and degreasing bath free alkalinity is 85 points, Faradaic current
6000A, voltage 15V, rinse bath free alkalinity are 8 points, 115 DEG C of the drying temperature of strip.
Annealing process are as follows: furnace atmosphere is hydrogen and nitrogen, and wherein hydrogen 2.30%, entering zinc pot money belt steel temperature is 520
℃。
Or immersion are as follows: the chemical component of plating solution is aluminium 18%, and magnesium 0.5%, silicon 0.05%, remaining is zinc and can not keep away
The impurity exempted from；Zinc pot temperature is 530 DEG C, coating weight 40g/m2(two-sided).
After hot-dip, first use blower that belt steel temperature in belt steel surface, is dropped to air blown before the first slewing rollers
To 350 DEG C, strip is then cooled to room temperature in cooling tower, strip is then rolled into coil of strip with winder.
Through detecting, the hot-dip aluminum zinc Mg Alloy Coating plate surface quality of the present embodiment and functional, in neutral salt
Occur the time of red rust under mist experimental condition in 450h or more, zinc-aluminum-magnesium clad steel sheet incision occur the red rust time 400h with
On, higher than the heat zinc coating plate and hot dip aluminum zinc plate of same coating weight.Flawless after 0T bending, forming property are better than galvanized sheet, make
It is the plate surface quality that is used for household electrical appliances, functional, fully meet user's requirement.
Embodiment 2
Hot-dip aluminum zinc Mg Alloy Coating steel plate, the chemical composition mass percentage distribution ratio of coating are as follows: aluminium 21%, magnesium
1.5%, silicon 0.15%, remaining is zinc and inevitable impurity.
Preparation method: steel plate carries out continuous annealing after cleaning by degreasing, then carries out cooling down after hot-dip again, batch i.e.
Obtain zinc-plated almag clad steel sheet.
Cleaning by degreasing technique are as follows: tank liquor temperature need to be controlled at 80 DEG C, and degreasing bath free alkalinity is 85 points, electric current 7000A, electricity
Pressure is 18V, and rinse bath free alkalinity is 6 points, 120 DEG C of the drying temperature of strip.
Annealing process are as follows: hydrogen 2.10% in furnace, belt steel temperature is 540 DEG C before entering zinc pot.
Or immersion are as follows: aluminium 21%, magnesium 1.5%, silicon 0.15%, remaining is zinc and inevitable impurity；Zinc pot temperature
Degree is 550 DEG C, coating weight 80g/m2(two-sided).
After hot-dip, first use blower that belt steel temperature in belt steel surface, is dropped to air blown before the first slewing rollers
To 300 DEG C, strip is then cooled to room temperature in cooling tower, strip is then rolled into coil of strip with winder.
Through detecting, the hot-dip aluminum zinc Mg Alloy Coating plate surface quality of the present embodiment is good, in neutral salt spray test
Under the conditions of there is the time of red rust in 800h or more, there is the red rust time in 750h or more in zinc-aluminum-magnesium clad steel sheet incision, high
In the heat zinc coating plate and hot dip aluminum zinc plate of same coating weight.Flawless after 0T bending, forming property are better than galvanized sheet.As household electrical appliances
It is the plate surface quality that uses, functional, fully meet user's requirement.
Embodiment 3
Hot-dip aluminum zinc Mg Alloy Coating steel plate, the chemical composition mass percentage distribution ratio of coating are as follows: aluminium 25%, magnesium
3.0%, silicon 0.25%, remaining is zinc and inevitable impurity.
Preparation method: steel plate carries out continuous annealing after cleaning by degreasing, then carries out cooling down after hot-dip again, batch i.e.
Obtain zinc-plated almag clad steel sheet.
Cleaning by degreasing technique are as follows: tank liquor temperature need to be controlled at 85 DEG C, and degreasing bath free alkalinity is 80 points, Faradaic current
7500A, voltage 12V, rinse bath free alkalinity are 5 points, 120 DEG C of the drying temperature of strip.
Annealing process are as follows: hydrogen 2.20% in furnace, belt steel temperature is 550 DEG C before entering zinc pot.
Or immersion are as follows: aluminium 25%, magnesium 3.0%, silicon 0.25%, remaining is zinc and inevitable impurity；Zinc pot temperature
Degree is 560 DEG C, coating weight 120g/m2(two-sided).
After hot-dip, first use blower that belt steel temperature in belt steel surface, is dropped to air blown before the first slewing rollers
To 330 DEG C, strip is then cooled to room temperature in cooling tower, strip is then rolled into coil of strip with winder.
Through detecting, the hot-dip aluminum zinc Mg Alloy Coating plate surface quality of the present embodiment is good, in neutral salt spray test
Under the conditions of there is the time of red rust in 1500h or more, there is the red rust time in 1350h or more in zinc-aluminum-magnesium clad steel sheet incision,
Higher than the heat zinc coating plate and hot dip aluminum zinc plate of same coating weight.Flawless after 0T bending, forming property are better than galvanized sheet.As family
It is plate surface quality that electricity uses, functional, fully meet user's requirement.
Claims (10)
1. dip galvanized aluminum magnesium clad steel sheet, including substrate and coating, which is characterized in that the chemical component quality hundred of the coating
Distribution ratio are as follows: aluminium 18~26%, magnesium 0.5~3.5%, silicon 0.05~0.25%, remaining is zinc and inevitable impurity.
2. dip galvanized aluminum magnesium clad steel sheet according to claim 1, which is characterized in that the chemical component quality of the coating
Per distribution ratio are as follows: aluminium 21~25%, magnesium 1.5~3%, silicon 0.15~0.25%, remaining is zinc and inevitable impurity.
3. the preparation method of dip galvanized aluminum magnesium clad steel sheet as claimed in claim 1 or 2, which comprises the following steps:
Cleaning by degreasing, hot-dip, cooling, is batched at annealing.
4. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the cleaning by degreasing
In, the temperature in lye tank (vat) is 65~90 DEG C, and free alkalinity is 60~90 points, and electrolytic tank electrolysis electric current is 5000~8000A, electricity
Pressure is 10~25V；The free alkalinity of rinse bath is lower than at 10 points.
5. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the cleaning by degreasing
The drying temperature of steel plate is not less than 110 DEG C afterwards.
6. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the gas of the annealing
Atmosphere is nitrogen and hydrogen, the wherein percentage by volume 2.0~10% of hydrogen.
7. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the hot-dip
In, entering zinc pot front spring temperature is 520~560 DEG C.
8. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the hot-dip
In, the composition quality percentage of plating solution is aluminium 18~26%, and magnesium 0.5~3.5%, silicon 0.05~0.25%, remaining is for zinc and not
Evitable impurity；The temperature of zinc pot is 530~570 DEG C.
9. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the hot-dip
In, the composition quality percentage of plating solution is aluminium 21~25%, and magnesium 1.5~3%, silicon 0.15~0.25%, remaining is zinc and can not
The impurity avoided.
10. the preparation method of dip galvanized aluminum magnesium clad steel sheet according to claim 3, which is characterized in that the coating
Weight is 40~200g/m2。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110343987A (en) * | 2019-07-30 | 2019-10-18 | 攀钢集团攀枝花钢钒有限公司 | Hot dipping of zinc-aluminum alloy clad steel sheet/band and its production method |
| CN111270182A (en) * | 2020-03-20 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip Zn-Al-Mg alloy coated steel plate and preparation method thereof |
| CN112342482A (en) * | 2020-10-19 | 2021-02-09 | 首钢京唐钢铁联合有限责任公司 | Hot-dip aluminum-zinc steel plate and preparation 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 |
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| JP2011219791A (en) * | 2010-04-06 | 2011-11-04 | Nippon Steel Corp | Coated plated steel material for concrete structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343987A (en) * | 2019-07-30 | 2019-10-18 | 攀钢集团攀枝花钢钒有限公司 | Hot dipping of zinc-aluminum alloy clad steel sheet/band and its production method |
| CN111270182A (en) * | 2020-03-20 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip Zn-Al-Mg alloy coated steel plate and preparation method thereof |
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| 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 |
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Application publication date: 20190618 |