CN111349849B - Aluminum-clad plate strip capable of inhibiting corrosion and manufacturing method thereof - Google Patents
Aluminum-clad plate strip capable of inhibiting corrosion and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum-clad plate strip for inhibiting corrosion, which comprises a steel substrate and an aluminum layer clad on the surface of the steel substrate; the steel substrate comprises the following chemical elements in percentage by mass: c is more than 0 and less than or equal to 0.02 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.05-0.5%, P: 0.018-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.04%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities. In addition, the invention also discloses a manufacturing method of the aluminum clad plate strip for inhibiting corrosion, which comprises the following steps: (1) preparing a steel strip and an aluminum strip; (2) carrying out surface treatment on the steel strip and the aluminum strip; (3) covering the surface of the steel strip with an aluminum strip and rolling at room temperature; (4) annealing; (5) and (6) finishing and straightening.
Description
Technical Field
The invention relates to a plate strip and a manufacturing method thereof, in particular to an aluminum clad plate strip and a manufacturing method thereof.
Background
With the development of technology and economy, the performance requirements on metal materials are higher and higher, and the metal materials with single composition are often difficult to meet the requirements of multi-aspect performance in the actual use process. The composite board is made of two or more metal materials by various different processes, and can meet the special comprehensive performance requirements. The aluminum-clad steel is a composite plate strip which is formed by cladding an aluminum film on the surface of strip steel by rolling at room temperature to form a surface of aluminum and a core layer of steel, has the strength of the existing steel, has the characteristics of good heat dissipation, corrosion resistance, light weight and attractive appearance of the aluminum, particularly greatly reduces the cost, and is widely applied to the fields of household electrical panels, heat dissipation parts, decoration and the like.
The composite material prepared by compounding aluminum with steel with good heat dissipation performance at room temperature has the characteristics of strength of the steel, good heat dissipation performance of the aluminum, corrosion resistance and the like, and is particularly suitable for manufacturing structural members which have heat dissipation requirements and require certain strength.
Chinese patent publication No. CN101748853A, publication No. 2010, 6/23/2010, entitled "an aluminum steel/aluminum steel-aluminum composite metal plate and a method for manufacturing the same", discloses an aluminum steel/aluminum steel-aluminum composite metal plate. In the technical scheme disclosed in the Chinese patent document, steel-aluminum compounding is realized by adopting a binder, and the compounding strength is low.
Chinese patent publication No. CN102019727A, published as 2011, 4/20/entitled "aluminum-coated steel strip for cooler and method for producing same and steel strip and aluminum alloy strip used for same" discloses an aluminum-coated steel strip for cooler and method for producing same and steel strip and aluminum alloy strip used for same. The aluminum-coated steel strip related to the technical scheme disclosed by the Chinese patent document has low strength and has the problem that the section of steel and aluminum is easy to rust.
In summary, in the prior art, the aluminum-clad plate strip usually adopts a binder to realize physical compounding of steel and aluminum, and the problem of poor steel-aluminum bonding strength exists. In addition, because the prior art adopts the room temperature cold rolling and post-rolling annealing process for production, the aluminum-clad plate strip in the prior art generally has the problem of corrosion of the aluminum-clad section due to the design components of the steel substrate, and the use of the aluminum-clad strip steel is further influenced.
Disclosure of Invention
One of the objectives of the present invention is to provide a corrosion-inhibiting aluminum clad sheet strip, which has the characteristics of steel strength, aluminum corrosion resistance, heat dissipation and beauty, and is very suitable for application in heat sinks, heat dissipation fins, corrosion-resistant pipes or boxes.
In order to achieve the purpose, the invention provides an aluminum-clad plate strip for inhibiting corrosion, which comprises a steel substrate and an aluminum layer coated on the surface of the steel substrate; the steel substrate comprises the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.02 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.05-0.5%, P: 0.018-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.04%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities.
In the aluminum clad plate strip, in order to enable the aluminum clad plate strip to have excellent plasticity, the aluminum clad plate strip is a steel-aluminum composite strip obtained by cladding an aluminum layer on the surface of a steel substrate. In the present invention, the steel substrate may be single-sided coated with aluminum, or both upper and lower surfaces of the steel substrate may be coated with aluminum layers.
In order to facilitate steel-aluminum lamination, certain requirements are required for the adopted steel substrate, and the steel substrate is required to have excellent plasticity and steel-aluminum interface bonding performance, so that certain strict requirements are required for the components of the steel substrate, particularly the addition amount of certain alloy components is required to be limited in order to ensure good steel-aluminum interface bonding performance and inhibit cross-section corrosion performance, and meanwhile, the conventional alloy components have definite control requirements, which are obviously different from common steel types.
Here, the inventor designs the mass percentage of the chemical elements through a large number of experimental research and analysis, and the design principle of each chemical element is as follows:
c: for the steel substrate in the aluminum-clad plate strip, C can be fused into a steel matrix to play a role in solid solution strengthening, and can form fine carbide precipitation particles to play a role in precipitation strengthening. However, C with a large content is unfavorable for welding, toughness and plasticity of steel plates, so that the mass percent of C in the steel substrate is controlled to be more than 0 and less than or equal to 0.02 percent in the aluminum-clad plate strip, wherein the mass percent of C is preferably 0.004 to 0.015 percent.
Si: in the technical scheme of the invention, Si is a deoxidizing element and is also a solid solution strengthening element, for the technical scheme of the invention, the yield strength of the steel plate can be improved and the elongation can be reduced by adding Si, and Si exceeding the upper limit of the content of the scheme can deteriorate the composite performance of a steel-aluminum interface, so that the mass percent of Si of a steel substrate in the aluminum-clad plate strip is controlled to be more than 0 and less than or equal to 0.005 percent.
Mn: for the steel substrate of the aluminum-clad plate strip, Mn is a strengthening element, the yield strength of the steel substrate is improved through solid solution strengthening, and the elongation of the steel substrate can be reduced, so that the mass percent of Mn in the steel substrate is controlled to be 0.05-0.5% in the aluminum-clad plate strip.
P: in the aluminum clad plate strip, P is easy to segregate at a grain boundary for a steel substrate, so that the bonding energy of the grain boundary is reduced, and the steel plate becomes brittle. The P is added into the free-cutting steel, so that the chips can be prevented from sticking on the cutter, and the service life of the cutter is prolonged. In the steel system of the technical scheme, the fifth group element in the periodic table of the elements of P and N is found to have the property similar to that of N, and the steel of the technical scheme can inhibit the diffusion of Al, so that the steel particularly plays a role in making a brittle steel-aluminum compound layer difficult to form on a steel-aluminum interface, thereby obviously improving the steel-aluminum bonding performance and playing an important role in realizing the technical effect of the scheme. On the other hand, in the present invention, P exceeding the upper limit of the content is disadvantageous to the toughness and elongation of the steel grade of the present invention, and therefore, in the aluminum clad plate strip of the present invention, the mass percentage of P of the steel substrate is limited to 0.018 to 0.03%, and preferably, the mass percentage of P may be further controlled to 0.018 to 0.024%.
Al: in the aluminum clad plate strip, Al is an essential element for deoxidizing a steel substrate, and simultaneously, the strength of steel is improved, but Al with high content is easy to diffuse to a steel-aluminum bonding interface, so that the interface bonding strength is deteriorated. Therefore, in the technical scheme of the invention, the mass percent of Al is required to be controlled so as to avoid influencing the steel-aluminum bonding performance, so that the mass percent of Al in the steel substrate is controlled to be less than or equal to 0.005 percent.
Cu: in the technical scheme of the invention, Cu has a solid solution strengthening effect, so that the addition of Cu can temper at a proper temperature to have a secondary hardening effect, thereby improving the strength of the steel grade related to the invention. In addition, in the technical scheme of the invention, Cu is one of the elements for improving the corrosion resistance of the steel type related to the invention, because the electrochemical potential of Cu is higher than that of Fe, the addition of Cu can promote the densification of a rust layer on the surface of the steel and play a role in stabilizing the formation of the rust layer, but Cu exceeding the upper limit of the content of the Cu is unfavorable for welding and is easy to generate net cracking during hot rolling, so the mass percent of Cu in the steel substrate is controlled to be 0.04-0.10%.
Cr: for the technical solution of the present invention, Cr is a corrosion resistant element. The addition of Cr can remarkably improve the self-corrosion potential of the steel grade related to the invention and inhibit the occurrence of corrosion. In addition, Cr may form a continuous solid solution with Fe in steel, thereby playing a role of a solid solution strengthening effect. In addition, Cr can form various types of carbides with C, such as M3C、M7C3And M23C6And the secondary strengthening effect is generated, so that the performance of the steel grade related to the invention is improved. On the other hand, however, Cr exceeding the upper limit of the content is disadvantageous in welding and toughnessAnd also the capacity change is increased, so that the mass percent of Cr in the steel substrate is controlled to be 0.1-0.25% in the aluminum clad plate strip.
N: in the technical scheme of the invention, N can form AlN particles with Al in the steel, so that the diffusion of Al to an interface is inhibited, but the strength of the steel can be obviously improved by higher N solid solution content, and the plasticity is not favorable. Therefore, in the aluminum clad plate strip, the mass percent of N of the steel substrate is controlled to be 0.0040-0.01%, and preferably, the mass percent of N can be further controlled to be 0.004-0.008%. In some preferred embodiments, the mass percentages of Ti, N, and C may be further limited to satisfy Ti/(3.42N +4C) ≧ 0.3.
Ti: in the solution of the invention, Ti is used to fix C, N atoms to reduce their resistance to dislocation movement. Meanwhile, in the technical scheme of the invention, the added Ti can also play a role in deoxidation. Ti can form TiN and Ti in sequence in steel4C2S2And TiS and TiC eliminate C, N free atoms in steel, so that the yield strength of the steel substrate is reduced. But more TiC and TiN particles can generate coarsening, so that the grain boundary pinning effect is lost, the grain size is increased, the grain boundary strengthening effect is reduced, and the elongation of the steel substrate is reduced. Therefore, in the aluminum clad plate strip, the mass percent of Ti in the steel substrate is controlled to be 0.01-0.04%.
O: in the aluminum clad plate strip, because the contents of Si and Al are limited in an extremely low range in the technical scheme of the invention, the oxygen content in steel is inevitably higher. However, the oxygen element can suppress adverse effects of the Al element in the steel on the interface bonding of steel and aluminum, but at the same time, considering that an excessively high content of oxygen tends to form non-metallic inclusions, which are detrimental to the fatigue properties and toughness of the steel sheet, the mass percentage of O of the steel substrate is limited to 0.02 to 0.050% and preferably 0.02 to 0.04% in the aluminum clad sheet strip according to the present invention. In some preferred embodiments, O, Al and Si may be further defined to satisfy O/(0.9Al +1.2Si) ≧ 3.0.
In conclusion, according to the technical scheme of the invention, the P, Cu and Cr are matched, particularly, P is added as a beneficial element in the scheme, so that the production difficulty is reduced, the production process is simplified, the production efficiency is improved, the weather resistance index I can be controlled to be 1.0-3.0 by adding a proper amount of Cu and Cr, the inhibition of the steel-aluminum section corrosion is realized, the aluminum-clad plate strip with the function of inhibiting the steel-aluminum section corrosion is obtained, and the problem of the section corrosion commonly existing in the dissimilar metal composite material in the prior art is solved.
In addition, the corrosion-inhibiting aluminum-clad plate strip has the function of inhibiting the corrosion of the steel-aluminum section. The corrosion inhibition has two ways, one is to form a compact protective rust layer on the surface of the material to realize physical barrier and prevent the corrosion from penetrating into the substrate; another is to increase the self-etching potential of the material, thereby reducing the tendency to etch. The technical scheme of the invention adopts the latter mode to realize the inhibition of the corrosion of the steel-aluminum section. In addition, since the substrate for aluminum cladding must ensure proper steel-aluminum bonding performance, and therefore, the selection of corrosion-resistant elements must ensure that the interface bonding performance of steel and aluminum is not affected, the inventors have found that the addition of Cu and Cr in the amounts defined in the present application can play a role of being solid-dissolved in steel and hindering the diffusion of Al, and does not promote the formation of iron-aluminum compounds at the steel-aluminum interface, thereby having no adverse effect on the steel-aluminum bonding performance. However, if the content exceeds the content defined in the present application, Cu and Cr promote the formation of a surface protective rust layer, which affects the appearance quality of the aluminum-clad material and adversely affects the steel-aluminum bonding performance.
In addition, in the present case, the corrosion mainly occurs at the edge of the aluminum-clad material, i.e., the cross-sectional position, rather than the entire steel-aluminum interface.
Further, in the corrosion-inhibited aluminum clad plate strip of the invention, the chemical elements in the steel substrate also satisfy the following conditions: at least one of Ti/(3.42N +4C) is not less than 0.3 and O/(0.9Al +1.2Si) is not less than 3.0.
In addition, Ti, N, C, O, Al, and Si in the above formulas each represent a mass percentage thereof, and the numerical value of the above formula is a numerical value before the percentile, for example, when the mass percentage of Ti is 0.021%, the mass percentage of N is 0.0068%, and the mass percentage of C is 0.0082%, the formula of Ti/(3.42N +4C) ═ 0.021/(3.42 × 0.0068+4 × 0.0082) ═ 0.37 is substituted.
Further, in the corrosion-inhibited aluminum-clad plate strip of the invention, the mass percentage of each chemical element of the steel substrate also satisfies at least one of the following:
C：0.004-0.015％，P：0.018-0.024％，N：0.004-0.008％，O：0.02-0.04％。
further, in the corrosion-inhibited aluminum clad sheet strip of the present invention, among other inevitable impurities: s is less than or equal to 0.005 percent.
Further, in the corrosion-inhibited aluminum clad plate strip of the invention, the matrix of the steel substrate is equiaxed ferrite, and the ferrite grain size is 10-50 microns.
Furthermore, in the corrosion-inhibiting clad aluminum plate strip, the thickness of the steel-aluminum interface compound layer of the clad aluminum plate strip is less than or equal to 5 μm.
Further, in the corrosion-inhibited aluminum clad plate strip of the invention, the thickness of the steel-aluminum interface compound layer of the aluminum clad plate strip is 0 μm.
Further, in the corrosion-inhibited aluminum clad plate strip of the invention, the thickness of the aluminum layer accounts for 0.5-15% of the total thickness of the aluminum clad plate strip.
Furthermore, in the corrosion-inhibiting aluminum clad plate strip, the thickness is 0.3-4 mm.
Furthermore, in the corrosion-inhibiting aluminum clad plate strip, the yield strength of a steel substrate is 200-280MPa, the tensile strength is 280-380MPa, the elongation is not less than 35 percent, and the weather-resistant index I is 1.0-3.0.
It should be noted that the weathering steel has good weather resistance by adding corrosion resistant elements, and is generally called weathering steel with weather resistance index above 6.0, wherein weather resistance index I is defined as follows:
I＝26.01Cu+3.88Ni+1.2Cr+1.49Si+17.28P-7.29CuNi-9.1NiP-33.39Cu2
since the calculation of the weathering index I should be known to those skilled in the art, it is not described in detail herein.
With respect to the prior art, the corrosion resistance of weathering steels results on the one hand from the increasing effect of the alloying elements on the corrosion potential and on the other hand from the formation of a protective rust layer on the material surface. The formation of protective rust layer is not suitable for the steel for high-strength aluminum-clad substrate according to the present invention, and therefore, the formation of such rust layer must be avoided, and thus, the weather resistance index I is controlled to be between 1.0 and 3.0.
Accordingly, another object of the present invention is to provide a method for manufacturing an aluminum clad plate strip with corrosion inhibition, wherein the aluminum clad plate strip obtained by the method has good mechanical properties, and the aluminum clad plate strip has good steel-aluminum interface bonding strength. In addition, the aluminum-clad plate strip obtained by the manufacturing method has a corrosion inhibition function, and the problem of corrosion of the steel-aluminum section in the prior art is solved. The aluminum-clad plate strip can be widely applied to devices with heat dissipation, corrosion resistance and surface quality requirements, such as heat dissipation sheets, pots, boxes, pipelines and household appliance panels.
In order to achieve the above object, the present invention provides a method for manufacturing the above corrosion-inhibited aluminum clad sheet strip, comprising the steps of:
(1) preparing a steel strip and an aluminum strip;
(2) carrying out surface treatment on the steel strip and the aluminum strip;
(3) covering the surface of the steel strip with an aluminum strip and rolling at room temperature;
(4) annealing;
(5) and (6) finishing and straightening.
It should be noted that, in the step (2), the surface treatment may be performed by, for example, acid washing, degreasing, and drying to remove oil stains or rust defects on the surface of the steel strip or the aluminum strip. While in some preferred embodiments the strip may be ground to increase the roughness of the aluminized side of the strip and to expose fresh base metal to increase mechanical bond strength, preferably with the grinding direction being parallel to the rolling direction.
Further, in the manufacturing method according to the present invention, in the step (3), the single-pass rolling deformation amount is controlled to be 50 to 90%.
In the scheme, the deformation of rolling deformation is too low, so that the deformation of a steel-aluminum interface is insufficient, the mechanical bonding strength is too low, and the delamination is easy; and if the deformation amount of rolling deformation is too large, the shearing stress between interfaces is too large due to the plasticity difference of steel and aluminum, so that the bonding strength of the interfaces is reduced, and even delamination is caused.
Further, in the manufacturing method of the present invention, in the step (4), the annealing temperature is 400-550 ℃.
According to the scheme, the annealing mode can adopt bell-type furnace annealing or continuous annealing furnace annealing, in the scheme, the annealing can eliminate work hardening generated in the room-temperature rolling process, the plasticity of the aluminum clad plate strip is improved, the strength is reduced, meanwhile, steel-aluminum interface atoms are mutually diffused in the annealing process, the mechanical bonding is transited to the metallurgical bonding during rolling, and the interface bonding strength is further improved.
Compared with the prior art, the aluminum-clad plate strip for inhibiting corrosion and the manufacturing method thereof have the following advantages and beneficial effects:
the steel substrate in the corrosion-inhibiting aluminum-clad plate strip has excellent comprehensive mechanical properties, the yield strength is 200-280MPa, the tensile strength is 280-380MPa, the elongation is more than or equal to 35 percent, and the plasticity is excellent.
In addition, the corrosion-inhibiting aluminum-clad plate strip strictly controls the chemical element components in the steel substrate, particularly the contents of S, Si, Al and O, N, ensures that the steel substrate and the aluminum layer have good interface bonding characteristics, the thickness of a compound layer of a steel-aluminum interface after the aluminum-clad plate strip is subjected to high-temperature brazing is less than or equal to 5 microns, even in some preferred embodiments, no steel-aluminum compound is formed, and the steel-aluminum interface is clean. Meanwhile, the weather resistance index I of the aluminum clad plate strip is controlled to be 1.0-3.0 by adjusting the content of corrosion resistant elements such as P, Cu and Cr, so that the problem of cross section corrosion of the aluminum clad plate strip is solved.
In addition, the aluminum-clad plate strip for inhibiting corrosion has good corrosion resistance, heat dissipation performance and surface quality, and can be used for producing radiator fins, pots, pipelines and corrosion-resistant boxes.
The manufacturing method of the invention also has the advantages and beneficial effects.
Drawings
FIG. 1 shows the interlaminar structure of the corrosion-inhibited aluminum clad sheet strips of examples 1-8.
Figure 2 shows the microstructure of the corrosion inhibiting clad aluminium strip of example 1.
Figure 3 shows the interlaminar structure of the corrosion-inhibited aluminum clad sheet strips of examples 9-15.
Figure 4 shows the microstructure of the corrosion-inhibited aluminum clad sheet strip of example 9.
Detailed Description
The corrosion-inhibiting coated aluminum strip and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to the following specific examples and drawings, which, however, should not be construed as unduly limiting the technical solution of the present invention.
Examples 1 to 15
The aluminum-clad plate strips of examples 1 to 15 include a steel substrate and an aluminum layer laminated on the surface of the steel substrate, wherein the aluminum-clad plate strips of examples 1 to 8 adopt 0.2mm aluminum strips as the aluminum layer to be laminated on the steel substrate on one side (see fig. 1), the aluminum-clad plate strips of examples 9 to 15 adopt 0.2mm aluminum strips as the aluminum layer to be laminated on the steel substrate on two sides (see fig. 3), and the mass percentages of the chemical elements of the steel substrate of each example are shown in table 1.
Table 1 shows the mass percentages (wt%) of the chemical elements in the steel substrates of the aluminum clad sheet strips in examples 1 to 15.
TABLE 1 (wt%, balance Fe and unavoidable impurity elements other than S)
The method of making the corrosion-inhibited aluminum clad sheet strip of examples 1-15 was made using the following steps:
(1) steel strips were produced with the steel substrate compositions listed in table 1 and 0.2mm aluminium layer was used as aluminium strip.
(2) And carrying out surface treatment on the steel strip and the aluminum strip.
(3) Covering the surface of the steel strip with an aluminum strip, and rolling at room temperature: and controlling the deformation of single-pass rolling to be 50-90%.
(4) Annealing: the annealing temperature is 400-550 ℃.
(5) And (6) finishing and straightening.
It should be noted that, in the step (2), the surface treatment may be performed by, for example, acid washing, degreasing, and drying to remove oil stains or rust defects on the surface of the steel strip or the aluminum strip. And the steel strip may be ground to increase the roughness of the aluminum coated surface of the steel strip and to expose fresh base metal to increase mechanical bonding strength, preferably with the grinding direction being parallel to the rolling direction.
Table 2 lists the specific process parameters involved in the method of making the corrosion-inhibited aluminum clad sheet strip of examples 1-15.
Table 2.
The corrosion-inhibited aluminum clad sheet strips of examples 1-15, as well as the steel substrates in the aluminum clad sheet strips, were subjected to the tests, and the results are listed in table 3.
Table 3.
It can be seen from tables 1 to 3 that, the aluminum clad plate strip of each embodiment of the present disclosure adopts the chemical components and the manufacturing method described in the present disclosure, so that the yield strength is 200-.
FIG. 1 shows the interlaminar structure of the corrosion-inhibited aluminum clad sheet strips of examples 1-8.
As shown in fig. 1, an aluminum layer II is single-side coated on the surface of a steel substrate I.
Figure 2 shows the microstructure of the corrosion inhibiting clad aluminium strip of example 1. As shown in FIG. 2, the matrix of the steel substrate I is equiaxed ferrite with a ferrite grain size of 10-50 μm. And further referring to fig. 2, it can be seen that the thickness of the steel-aluminum interface compound layer of the aluminum clad plate strip between the steel substrate I and the aluminum layer II is less than or equal to 5 μm.
Figure 3 shows the interlaminar structure of the corrosion-inhibited aluminum clad sheet strips of examples 9-15.
As shown in fig. 3, an aluminum layer II is double-coated on the surface of the steel substrate I.
Figure 4 shows the microstructure of the corrosion-inhibited aluminum clad sheet strip of example 9. As shown in FIG. 4, the matrix of the steel substrate I is equiaxed ferrite with a ferrite grain size of 10-50 μm. And further referring to fig. 4, it can be seen that the thickness of the steel-aluminum interface compound layer of the aluminum clad plate strip between the steel substrate I and the aluminum layer II is less than or equal to 5 μm.
Compared with the prior art, the aluminum-clad plate strip for inhibiting corrosion and the manufacturing method thereof have the following advantages and beneficial effects:
the steel substrate in the corrosion-inhibiting aluminum-clad plate strip has excellent comprehensive mechanical properties, the yield strength is 200-280MPa, the tensile strength is 280-380MPa, the elongation is more than or equal to 35 percent, and the plasticity is excellent.
In addition, the corrosion-inhibiting aluminum-clad plate strip strictly controls the chemical element components in the steel substrate, particularly the contents of S, Si, Al and O, N, ensures that the steel substrate and the aluminum layer have good interface bonding characteristics, the thickness of a compound layer of a steel-aluminum interface after the aluminum-clad plate strip is subjected to high-temperature brazing is less than or equal to 5 microns, even in some preferred embodiments, no steel-aluminum compound is formed, and the steel-aluminum interface is clean. Meanwhile, the weather resistance index I of the aluminum clad plate strip is controlled to be 1.0-3.0 by adjusting the content of corrosion resistant elements such as P, Cu and Cr, so that the problem of cross section corrosion of the aluminum clad plate strip is solved.
In addition, the aluminum-clad plate strip for inhibiting corrosion has good corrosion resistance, heat dissipation performance and surface quality, and can be used for producing radiator fins, pots, pipelines and corrosion-resistant boxes.
The manufacturing method of the invention also has the advantages and beneficial effects.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (10)
1. The aluminum-clad plate strip comprises a steel substrate and an aluminum layer coated on the surface of the steel substrate; the steel substrate is characterized by comprising the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.02 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.05-0.5%, P: 0.021-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.04%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities;
the matrix of the steel substrate is equiaxed ferrite, and the grain size of the ferrite is 10-50 microns;
the thickness of the steel-aluminum interface compound layer of the aluminum-clad plate strip is less than or equal to 5 microns;
the chemical elements in the steel substrate also satisfy the following conditions: at least one of Ti/(3.42N +4C) is not less than 0.3 and O/(0.9Al +1.2Si) is not less than 3.0.
2. The corrosion-inhibited aluminum-clad plate strip of claim 1, wherein the steel substrate further comprises at least one of the following chemical elements in percentage by mass:
C：0.004-0.015％，P：0.021-0.024％，N：0.004-0.008％，O：0.02-0.04％。
3. the corrosion-inhibited aluminum clad sheet strip of claim 1 wherein, among other unavoidable impurities: s is less than or equal to 0.005 percent.
4. The corrosion-inhibited aluminum clad sheet strip of claim 1 wherein the steel-aluminum interface compound layer thickness of the aluminum clad sheet strip is 0 μm.
5. The corrosion-inhibited aluminum clad sheet of claim 1 wherein the aluminum layer has a thickness of 0.5 to 15% of the total thickness of the aluminum clad sheet.
6. The corrosion inhibited aluminum clad sheet strip of claim 1 having a thickness of 0.3 to 4 mm.
7. The corrosion-inhibited aluminum-clad plate strip as claimed in any one of claims 1 to 6, wherein the yield strength of the steel substrate is 200-280MPa, the tensile strength is 280-380MPa, the elongation is not less than 35%, and the weather-resistance index I is 1.0-3.0.
8. The method of making a corrosion inhibiting aluminum clad sheet strip of any one of claims 1 to 7 including the steps of:
(1) preparing a steel strip and an aluminum strip;
(2) carrying out surface treatment on the steel strip and the aluminum strip;
(3) covering the surface of the steel strip with an aluminum strip and rolling at room temperature;
(4) annealing;
(5) and (6) finishing and straightening.
9. The manufacturing method according to claim 8, wherein in the step (3), the single-pass rolling deformation is controlled to be 50 to 90%.
10. The manufacturing method as claimed in claim 8, wherein in the step (4), the annealing temperature is 400-550 ℃.
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