CN110923603A - High-heat-resistance hot-dip aluminum-zinc plated steel plate and production method thereof - Google Patents
High-heat-resistance hot-dip aluminum-zinc plated steel plate and production method thereof Download PDFInfo
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- CN110923603A CN110923603A CN201911250696.2A CN201911250696A CN110923603A CN 110923603 A CN110923603 A CN 110923603A CN 201911250696 A CN201911250696 A CN 201911250696A CN 110923603 A CN110923603 A CN 110923603A
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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
- C23C2/12—Aluminium or alloys based thereon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- C23C2/26—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
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Abstract
The invention discloses a high-heat-resistance hot-dip aluminum-zinc plated steel plate and a production method thereof, wherein the high-heat-resistance hot-dip aluminum-zinc plated steel plate comprises a steel plate body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition: 10-30 parts of zinc, 60-85 parts of aluminum, 0.8-1.6 parts of silicon, 0.007-0.180 part of cerium, 0.003-0.850 part of dysprosium, and the balance of unavoidable impurities. The plating layer of the high-heat-resistance hot-dip aluminum-zinc plated steel plate has the advantages that the surface is not easy to discolor, blacken and the like after being heated, the deformation is small after being heated, the heat resistance is good, and the use requirements of high appearance requirements and precision requirements of the steel plate can be met; furthermore, the thermal energy reflectivity is extremely high; the corrosion resistance is good.
Description
Technical Field
The invention relates to the field of steel plates, in particular to a high-heat-resistance hot-dip aluminum-zinc plated steel plate and a production method thereof.
Background
Any type of metal component made of ferrous material, more particularly of steel, generally has applications requiring it to receive effective protection against corrosion. In this respect, it is known practice to protect steel-based components from corrosion by galvanization (zinc coating). In galvanization, steel has a generally thin zinc coating to protect the steel from corrosion. There are various galvanizing processes available for galvanizing steel parts, in other words, coating them with a metallic covering of zinc, including in particular hot dip galvanizing, zinc metal spraying (wire flame spraying), diffusion galvanizing (galvannealing), electrogalvanizing (electrolytic galvanizing), electroless galvanizing by means of zinc foil coating, and mechanical galvanizing.
The most important method for corrosion protection of steel by means of metallic zinc coatings is probably hot dip galvanization. In this process, the steel is immersed continuously (e.g., coil and wire) or one by one (e.g., part) in a heating bath containing liquid zinc at a temperature of about 450 ℃ to 600 ℃ (the melting point of zinc is 419.5 ℃), so that a resistant alloy layer of iron and zinc is formed on the steel surface, and a very strongly adherent pure zinc layer is formed thereon.
Hot dip galvanization provides both active and passive corrosion protection. Passive protection is through the barrier effect of the zinc coating. Active corrosion protection is based on the cathodic activity of the zinc coating. Zinc acts as a sacrificial anode to protect the underlying iron from corrosion relative to the more noble metal (e.g., iron) in the electrochemical voltage series until the zinc itself is completely corroded.
According to DIN EN ISO 1461, individual galvanization is used for the hot-dip galvanization of generally relatively large steel parts and structures. Thus, the steel base blank or finished workpiece (part) is pretreated and subsequently immersed in a zinc melt bath. In particular, immersion allows easy access to interior surfaces, welds, and inaccessible locations on a part or workpiece for galvanizing.
Conventional hot dip galvanization is based in particular on dipping iron and/or steel components into a zinc melt to form a zinc coating or zinc covering on the surface of the component. In order to ensure the adhesion, impermeability and uniformity of the zinc coating, it is generally necessary to carry out in advance a thorough surface treatment of the part to be galvanized, generally comprising degreasing and subsequent rinsing operations, subsequent acid pickling and downstream rinsing operations, and finally flux treatment (i.e. so-called fluxing) and subsequent drying operations.
A typical process sequence for conventional galvanization by hot dip galvanization generally takes the form: in the case of galvanising identical or similar components one by one (for example, large-scale/high-volume or mass-production of automotive components), they are usually organized or grouped for the entire process for reasons of process economy and economy (in particular by means of a common goods carrier (article carrier), for example configured as a cross-beam or rack, or a common mounting or connecting device for a plurality of these identical or similar components). For this purpose, a plurality of components are connected to the goods carrier by means of holding devices (e.g. latching devices, binding wires, etc.). The grouped state components are then provided to subsequent processing steps or stages by the cargo carrier.
First, the surfaces of the grouped components are degreased to remove grease and oil residues, using a degreaser in the form of an alkaline or acidic degreaser, usually aqueous. Cleaning in a degreasing bath is usually followed by a rinsing operation, usually by immersion in a water bath, to prevent the degreasing agent from entraining the galvanized material into the subsequent pickling operation, which is particularly important in the case of the transition from alkaline degreasing to pickling.
The next step is an acid cleaning treatment (pickling), which is used in particular to remove homologous impurities (such as rust and scale) from the steel surface. Pickling is usually done in dilute hydrochloric acid, and the duration of the pickling procedure depends on factors including the contamination status (e.g. degree of rusting) of the galvanized material and the acid concentration and temperature of the pickling bath. In order to prevent or minimize the entrainment of the galvanized material by the residual acid and/or residual salt, a rinsing operation (rinsing step) is usually performed after the pickling treatment.
This is followed by so-called fluxing (treatment with flux), in which the previously degreased and pickled steel surface has a so-called flux therein, usually an aqueous solution containing inorganic chlorides, most commonly a mixture of zinc chloride (ZnCl) and ammonium chloride (NHCl). On the one hand, the flux is used for the final intensive fine cleaning of the steel surface before it reacts with the molten zinc, dissolving the scale on the zinc surface and preventing the steel surface from re-oxidation before the galvanization process. On the other hand, the flux improves the wetting ability between the steel surface and the molten zinc. A drying operation is usually carried out after the flux treatment to produce a solid film of flux on the steel surface and to remove adhering water, thereby avoiding subsequent unwanted reactions (especially the formation of steam) in the liquid zinc impregnation bath.
The parts pretreated in the manner described above are then dipped into a liquid zinc melt for hot dip galvanising. In the case of hot dip galvanization using pure zinc, the zinc content of the melt is at least 98.0 wt.% according to DIN EN ISO 1461. After the galvanized material is immersed in the molten zinc, it is left in the zinc melt bath for a sufficiently long time, in particular until the galvanized material has been at its temperature and coated with a zinc layer. Before the galvanized material is extracted again from the zinc melt, the surface of the zinc melt is generally cleaned to remove, inter alia, oxides, zinc dust, flux residues, etc. The hot dip galvanized component in this way is subsequently cooled (for example in air or in a water bath). Finally, the holding means for the component, such as the latching means, the binding or the like, are removed. After the galvanizing operation, a rework or post-treatment operation (which may be involved in some cases) is typically performed. In this operation, the excess zinc residues, in particular called the zinc droplet stream that solidifies on the edges, and the oxides or ashes that adhere to the parts, are removed as far as possible.
One criterion for the quality of hot dip galvanization is the thickness of the zinc coating in μm (micrometers). The DIN EN ISO 1461 standard specifies the minimum value of the required coating thickness which is provided in terms of material thickness when galvanising one by one. In practice, the coating thickness is much higher than the minimum coating thickness specified in DIN EN ISO 1461. Generally, the thickness of the zinc coating produced by the one-by-one galvanizing is 2 to 200um or even more.
However, the hot-dip coated steel sheet currently used has the following problems:
1. the surface is easy to change color, blacken and the like after being heated, and has larger deformation and poor heat resistance after being heated, so that the use requirements of high appearance requirement and precision requirement of the steel plate can not be met;
2. low infrared (thermal) reflectance;
3. the corrosion resistance is poor.
Disclosure of Invention
In view of the above circumstances, an object of the present invention is to provide a hot-dip aluminized and galvanized steel sheet having high heat resistance and a method for producing the same, which can effectively solve the above problems.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a hot-dip aluminized and galvanized steel sheet with high heat resistance comprises a steel sheet body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
10-30 parts of zinc, 60-85 parts of aluminum, 0.8-1.6 parts of silicon, 0.007-0.180 part of cerium, 0.003-0.850 part of dysprosium, and the balance of unavoidable impurities.
Preferably, the composition of the hot dip coating of the aluminum zinc alloy comprises the following components in parts by weight based on 100 parts by weight:
16.5 to 24.5 parts of zinc, 69 to 81 parts of aluminum, 1.1 to 1.4 parts of silicon, 0.095 to 0.165 part of cerium and 0.015 to 0.755 part of dysprosium, and the balance of the components including inevitable impurities.
Preferably, the composition of the hot dip coating of the aluminum zinc alloy comprises the following components in parts by weight based on 100 parts by weight:
21.5 parts of zinc, 77.2 parts of aluminum, 1.25 parts of silicon, 0.144 part of cerium and 0.555 part of dysprosium, and the balance of the components comprises inevitable impurities.
Preferably, the aluminum-zinc alloy hot-dip coating layer further comprises, by weight, 100 parts of the whole composition:
0.135-0.165 parts of titanium.
Preferably, the steel plate body is made of carbon steel.
The invention also provides a production method of the high heat-resistant hot-dip aluminum-zinc plated steel plate, which comprises the following steps:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dipping the aluminum-zinc alloy hot dipping layer at the temperature of 525-555 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 0.5-1 ℃/s after the hot dip coating is finished;
D. and then annealing at 385-400 ℃ for 50-80 s to obtain the high-heat-resistance hot-dip aluminum-zinc plated steel plate.
Preferably, in the step B, the hot dip coating of the aluminum-zinc alloy is carried out at 535 ℃.
Preferably, the thickness of the hot dip coating of the aluminum-zinc alloy is 2-120 um.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the high-heat-resistance hot-dip aluminum-zinc plated steel plate, the raw material composition of the plating layer (the aluminum-zinc alloy hot-dip plating layer) is selected, the content of each raw material is optimized, and zinc, aluminum, silicon, cerium, dysprosium and the like in proper proportion are selected, so that the advantages of the zinc, the aluminum, the silicon, the cerium, the dysprosium and the like are fully exerted, the zinc, the silicon, the cerium, the dysprosium and the like are mutually complemented and promoted, the quality stability of a product is improved, the prepared plating layer (the aluminum-zinc alloy hot-dip plating layer) of the high-heat-resistance hot-dip aluminum-zinc plated steel plate is not easy to discolor, blacken and the like after the surface is heated, the deformation is small (the deformation is reduced; furthermore, the thermal energy reflectivity is extremely high; the corrosion resistance is good.
According to the high-heat-resistance hot-dip aluminum-zinc plated steel plate, zinc and aluminum in proper proportion are added and matched (the aluminum content is high), the high-heat-resistance hot-dip aluminum-zinc plated steel plate is used as a main raw material and is matched with other components, a good synergistic effect is achieved, the prepared coating (the aluminum-zinc alloy hot-dip coating) of the high-heat-resistance hot-dip aluminum-zinc plated steel plate is ensured, the surface of the coating is not easy to discolor, blacken and the like after being heated, the deformation is small after being heated, the heat resistance is good, and the use requirements of high appearance requirements and precision; furthermore, the thermal energy reflectivity is extremely high; the corrosion resistance is good.
The silicon with a proper proportion is added into the high-heat-resistance hot-dip aluminum-zinc plated steel plate, the high-heat-resistance hot-dip aluminum-zinc plated steel plate is matched with other components, a good synergistic effect is achieved, the heat resistance of a coating (the aluminum-zinc alloy hot-dip coating) of the prepared high-heat-resistance hot-dip aluminum-zinc plated steel plate is mainly improved, the surface is not easy to discolor and blacken when being heated, and the heating deformation is reduced; the surface size accuracy and the surface smoothness are improved.
Cerium is added in a proper proportion to the high-heat-resistance hot-dip aluminum-zinc plated steel plate, the high-heat-resistance hot-dip aluminum-zinc plated steel plate is matched with other components, a good synergistic effect is achieved, the heat resistance of a plating layer (the aluminum-zinc alloy hot-dip plating layer) of the prepared high-heat-resistance hot-dip aluminum-zinc plated steel plate is further improved, the surface is not easy to discolor and blacken after being heated, and the thermal deformation is reduced; the surface size accuracy and the surface smoothness are improved; intergranular corrosion can be reduced; the alloy structure is refined, so that the strength of the alloy is increased; improve the corrosion resistance of the alloy.
Dysprosium in a proper proportion is added to the high-heat-resistance hot-dip aluminum-zinc plated steel plate, the high-heat-resistance hot-dip aluminum-zinc plated steel plate is matched with other components, a good synergistic effect is achieved, the heat energy reflectivity of a coating (the aluminum-zinc alloy hot-dip coating) of the prepared high-heat-resistance hot-dip aluminum-zinc plated steel plate is improved, and the surface size accuracy and the surface smoothness are improved; and the corrosion resistance can be improved to a certain degree.
Titanium in a proper proportion in the high-heat-resistance hot-dip aluminum-zinc plated steel plate is matched with other components, so that a good synergistic effect is achieved, the infrared (heat) reflection performance of a coating (the aluminum-zinc alloy hot-dip coating) of the prepared high-heat-resistance hot-dip aluminum-zinc plated steel plate is improved, the infrared (heat) reflection rate is improved, and the surface size accuracy and the surface smoothness are improved; and the corrosion resistance can be improved to a certain degree.
The production method has simple process and simple and convenient operation, and saves manpower and equipment cost.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1:
a hot-dip aluminized and galvanized steel sheet with high heat resistance comprises a steel sheet body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
10-30 parts of zinc, 60-85 parts of aluminum, 0.8-1.6 parts of silicon, 0.007-0.180 part of cerium, 0.003-0.850 part of dysprosium, and the balance of unavoidable impurities.
Preferably, the composition of the hot dip coating of the aluminum zinc alloy comprises the following components in parts by weight based on 100 parts by weight:
16.5 to 24.5 parts of zinc, 69 to 81 parts of aluminum, 1.1 to 1.4 parts of silicon, 0.095 to 0.165 part of cerium and 0.015 to 0.755 part of dysprosium, and the balance of the components including inevitable impurities.
Preferably, the composition of the hot dip coating of the aluminum zinc alloy comprises the following components in parts by weight based on 100 parts by weight:
21.5 parts of zinc, 77.2 parts of aluminum, 1.25 parts of silicon, 0.144 part of cerium and 0.555 part of dysprosium, and the balance of the components comprises inevitable impurities.
Preferably, the aluminum-zinc alloy hot-dip coating layer further comprises, by weight, 100 parts of the whole composition:
0.135-0.165 parts of titanium.
Preferably, the steel plate body is made of carbon steel.
The present embodiment also provides a method for producing the high heat resistant hot-dip aluminum-zinc plated steel sheet, comprising the steps of:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dipping the aluminum-zinc alloy hot dipping layer at the temperature of 525-555 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 0.5-1 ℃/s after the hot dip coating is finished;
D. and then annealing at 385-400 ℃ for 50-80 s to obtain the high-heat-resistance hot-dip aluminum-zinc plated steel plate.
Preferably, in the step B, the hot dip coating of the aluminum-zinc alloy is carried out at 535 ℃.
Preferably, the thickness of the hot dip coating of the aluminum-zinc alloy is 2-120 um.
Example 2:
a hot-dip aluminized and galvanized steel sheet with high heat resistance comprises a steel sheet body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
16.5 parts of zinc, 69 parts of aluminum, 1.1 parts of silicon, 0.0955 part of cerium and 0.015 part of dysprosium, and the balance of the components comprises inevitable impurities.
In this embodiment, the composition of the hot dip coating of aluminum-zinc alloy, as a whole, is 100 parts by weight, and further includes:
0.135 part of titanium.
In this embodiment, the steel plate body is made of carbon steel and has a thickness of 1 cm.
In this embodiment, the method for producing a high heat resistant hot-dip aluminum-zinc plated steel sheet includes the steps of:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dip coating the aluminum-zinc alloy hot dip coating at 525 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 0.5 ℃/s after the hot dip plating is finished;
D. then, annealing is carried out at 385 ℃ for 80s, and the high heat-resistant hot-dip aluminum-zinc plated steel sheet is obtained.
In this embodiment, the thickness of the hot dip coating of aluminum-zinc alloy is 80 um.
Example 3:
a hot-dip aluminized and galvanized steel sheet with high heat resistance comprises a steel sheet body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
24.5 parts of zinc, 81 parts of aluminum, 1.4 parts of silicon, 0.165 part of cerium and 0.755 part of dysprosium, and the balance of the components comprises inevitable impurities.
In this embodiment, the composition of the hot dip coating of aluminum-zinc alloy, as a whole, is 100 parts by weight, and further includes:
0.165 parts of titanium.
In this embodiment, the steel plate body is made of carbon steel and has a thickness of 1 cm.
In this embodiment, the method for producing a high heat resistant hot-dip aluminum-zinc plated steel sheet includes the steps of:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dip coating the aluminum-zinc alloy hot dip coating at 555 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 1 ℃/s after the hot dip plating is finished;
D. then, annealing was performed at 400 ℃ for 50 seconds to obtain the high heat resistant hot dip aluminum-zinc plated steel sheet.
In this embodiment, the thickness of the hot dip coating of aluminum-zinc alloy is 80 um.
Example 4:
a hot-dip aluminized and galvanized steel sheet with high heat resistance comprises a steel sheet body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
21.5 parts of zinc, 77.2 parts of aluminum, 1.25 parts of silicon, 0.144 part of cerium and 0.555 part of dysprosium, and the balance of the components comprises inevitable impurities.
In this embodiment, the composition of the hot dip coating of aluminum-zinc alloy, as a whole, is 100 parts by weight, and further includes:
0.148 part of titanium.
In this embodiment, the steel plate body is made of carbon steel and has a thickness of 1 cm.
In this embodiment, the method for producing a high heat resistant hot-dip aluminum-zinc plated steel sheet includes the steps of:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dip coating the aluminum-zinc alloy hot dip coating layer at 535 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 0.8 ℃/s after the hot dip plating is finished;
D. then, annealing was performed at 392 ℃ for 65 seconds, and the high heat-resistant hot-dip aluminum-zinc plated steel sheet was obtained.
In this embodiment, the thickness of the hot dip coating of aluminum-zinc alloy is 80 um.
Comparative example 1:
a hot-dip coated steel sheet comprises a steel sheet body and a hot-dip coating; the hot dip coating covers on the steel plate body surface, and the hot dip coating is pure zinc coating, and thickness is 80 um.
In this embodiment, the steel plate body is made of carbon steel and has a thickness of 1 cm.
The hot dip coating production method thereof refers to the method of example 4.
Comparative example 2:
the difference from example 4 was that zinc 42 parts and aluminum 55 parts, and the other parts were the same as example 4.
Comparative example 3:
the difference from example 4 is that there is no silicon (zinc is substituted), and the other is the same as example 4.
Comparative example 4:
the difference from example 4 is that there is no cerium (replaced by zinc), and the rest is the same as example 4.
Comparative example 5:
the difference from example 4 is that there is no dysprosium (replaced with zinc), and the other is the same as example 4.
Comparative example 6:
the difference from example 4 is that there is no titanium (replaced by zinc), and the other is the same as example 4.
The high heat resistant hot dip aluminum-zinc plated steel sheets obtained in examples 2 to 4 of the present invention, and the dip plated steel sheets obtained in comparative examples 1 to 6 were subjected to the performance test, and the test results are shown in table 1 below:
first, blackening resistance:
the test panels were placed in boiling deionized water for 30 minutes. Subsequently, the white rust formation area was visually detected, and evaluation was made based on the following evaluation criteria. Note that: in the blackening resistance evaluation, the indication result of "3" or more means that the blackening resistance reaches a practical level.
4: no change;
3: the percentage of white rust-forming areas is less than 3%;
2: the percentage of white rust formation area is not less than 3% and less than 30%; and
1: the percentage of white rust formation area is not less than 30%.
Secondly, discoloration resistance:
the test panels were placed in an environment at 200 ℃ for 30 minutes. Subsequently, the discoloration-formed region (region where the color changed from that before the test) was visually detected, and evaluation was made based on the following evaluation criteria. Note that, in the blackening resistance evaluation, the indication result of "3" or more means that the blackening resistance reaches a practical level.
4: no change;
3: the percentage of discoloration-forming areas is less than 3%;
2: the percentage of discoloration-forming regions is not less than 3% and less than 30%; and
1: the percentage of discoloration-forming regions is not less than 30%.
TABLE 1
As can be seen from the above table, the high heat resistant hot-dip aluminum-zinc plated steel sheet of the present invention has the following advantages: the surface of the plating layer (the aluminum-zinc alloy hot-dip plating layer) of the high-heat-resistance hot-dip aluminum-zinc plated steel plate is not easy to discolor, blacken and the like after being heated, the heat resistance is good, the heat resistance is improved by more than 2 times (obviously improved) than that of a pure zinc plating layer, and the use requirements of high appearance requirements and precision requirements of the steel plate can be met; in addition, the heat energy reflectivity is extremely high, and the infrared reflection value is improved by more than 1.5 times compared with that of a pure zinc coating (comparative example 1).
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (8)
1. A hot-dip aluminum-zinc plated steel plate with high heat resistance is characterized by comprising a steel plate body and an aluminum-zinc alloy hot-dip coating layer; the aluminum-zinc alloy hot-dip coating covers the surface of the steel plate body; the aluminum-zinc alloy hot-dip coating comprises the following components in parts by weight based on 100 parts of the whole composition:
10-30 parts of zinc, 60-85 parts of aluminum, 0.8-1.6 parts of silicon, 0.007-0.180 part of cerium, 0.003-0.850 part of dysprosium, and the balance of unavoidable impurities.
2. The high heat resistant hot-dip aluminum-zinc plated steel sheet according to claim 1, wherein the composition of the aluminum-zinc alloy hot-dip plating layer contains, based on 100 parts by weight as a whole:
16.5 to 24.5 parts of zinc, 69 to 81 parts of aluminum, 1.1 to 1.4 parts of silicon, 0.095 to 0.165 part of cerium and 0.015 to 0.755 part of dysprosium, and the balance of the components including inevitable impurities.
3. The high heat resistant hot-dip aluminum-zinc plated steel sheet according to claim 1, wherein the composition of the aluminum-zinc alloy hot-dip plating layer contains, based on 100 parts by weight as a whole:
21.5 parts of zinc, 77.2 parts of aluminum, 1.25 parts of silicon, 0.144 part of cerium and 0.555 part of dysprosium, and the balance of the components comprises inevitable impurities.
4. The high heat resistant hot-dip aluminized and galvanized steel sheet according to claim 1, wherein the composition of the aluminum-zinc alloy hot-dip coating layer, as a whole, is 100 parts by weight, and further includes:
0.135-0.165 parts of titanium.
5. The high heat resistant hot-dip aluminized and galvanized steel sheet according to claim 1, wherein the steel sheet body is of a carbon steel material.
6. A method for producing a high heat resistant hot-dip aluminum-zinc plated steel sheet as claimed in any one of claims 1 to 5, comprising the steps of:
A. carrying out oil removal and rust removal treatment on the surface of the steel plate body;
B. hot dipping the aluminum-zinc alloy hot dipping layer at the temperature of 525-555 ℃;
C. cooling the steel plate to 225 ℃ at an average cooling speed of 0.5-1 ℃/s after the hot dip coating is finished;
D. and then annealing at 385-400 ℃ for 50-80 s to obtain the high-heat-resistance hot-dip aluminum-zinc plated steel plate.
7. The method for producing a high heat resistant hot-dip aluminized and galvanized steel sheet according to claim 6, wherein in step B, the aluminum-zinc alloy hot-dip coating layer is hot-dip coated at 535 ℃.
8. The method for producing a high heat resistant hot-dip aluminized and galvanized steel sheet according to claim 6, wherein the thickness of the aluminum-zinc alloy hot-dip coating layer is 2 to 120 μm.
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