JPH06212329A - Aluminum alloy clad material having high strength and high corrosion resistance for heat exchanger - Google Patents

Abstract

PURPOSE:To provide an aluminum alloy clad material having strength and corrosion resistance higher than conventional one and used, e.g. for tube material of automobile heat exchanger. CONSTITUTION:This material is an aluminum alloy clad material where one side of a core material is clad with a brazing filler metal composed of Al-Si alloy and the other side is clad with a sacrificial anode material composed of Al-Zn alloy, Al-Mg alloy, or Al-Zn-Mg alloy, etc. Further, the core material has a duplex structure, and the core material on the brazing filler metal side is composed of an Al alloy having a composition consisting of, by weight, 0.5-1.5% Mg, 0.3-1.5% Cu, 0.2-1.5% Si, <=0.2% Mg, and the balance Al with inevitable impurities and the core material on the sacrificial anode material side is composed of an Al alloy having a composition consisting of <=0.5% Si, >1.5-4.0% Mg, >0.3-11.5% Cu, 0.5-1.5% Mn, and the balance Al with inevitable impurities. Moreover, the thickness of the core material on the brazing filler metal side is regulated so that it is >=30% of the thickness of the whole core material. By this method, the aluminum alloy clad material having high strength and high corrosion resistance for heat exchanger can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy composite material used for heat exchangers of automobiles,
More specifically, the present invention relates to a high-strength and high-corrosion-resistant aluminum alloy composite material for a heat exchanger, which is used as a material for a pipe forming a refrigerant passage of a heat exchanger.

[0002]

2. Description of the Related Art Radiators are used in heat exchangers for automobiles.
There are various types such as a car air conditioner, an intercooler, and an oil cooler. For example, a radiator having a structure as shown in FIG. 1 is used. In FIG. 1, 1 is a tube, 2 is a fin, 3 is a header, and 4 is a tank.
The tube 1, fins 2 and header 3 are made of aluminum material, and the tank 4 is often made of resin. The tube 1, the fin 2, and the header 3 are integrated by brazing using a fluoride-based flux, and a resin tank is attached to this by mechanical joining (caulking) to manufacture a radiator. The tube material is Al-Mn alloy 300
3 alloy as the core material and Al on the fin side (atmosphere side) of the core material
A three-layer structure in which a brazing material such as 4343 alloy or 4045 alloy, which is a Si-based alloy, is clad, and a sacrificial anode material such as an Al-Zn-based alloy or Al-Zn-Mg-based alloy is clad on the other surface (refrigerant side). The aluminum alloy composite material having a structure is made into a flat tube by electric resistance sewing and roll forming. The plate thickness is 0.3 to 0.4 mm. As the fin material, a material in which Zn is added to 3003 alloy to have a sacrificial anode function is used, and the thickness thereof is 0.08 to
It is 0.11 mm. As the header material, an aluminum alloy composite material in which a brazing material is clad on the atmosphere side of a 3003 alloy core material and a sacrificial anode material is clad on the refrigerant side is used as the header material, and the wall thickness is 1 to 1. 2 mm
Is.

In recent years, there has been an increasing demand for weight reduction of automobiles, and to meet the demand, weight reduction of automobile heat exchangers has also been demanded. Therefore, thinning of each member has been studied, and for an aluminum alloy composite material, an Al-Mn-Cu-based alloy, Al-Si-Mg-based alloy, Al-Si-Mg-Mn-based alloy is used as a core material for thinning. Conventional Al-M
The adoption of alloys with higher strength and higher corrosion resistance than n-based alloys is being promoted.

[0004]

However, in brazing using a fluoride-based flux, the above-mentioned M
The brazing property of an aluminum alloy composite material having an alloy containing g as a core material is unstable. For example, in an aluminum alloy composite material used as a tube material, when 0.3 wt% or more of Mg is added to the core material, Mg diffuses from the core material into the brazing material during brazing and F in the flux applied during brazing
And Mg react with each other to form a MgF compound on the surface of the tube material, which significantly deteriorates the brazing property between the tube material and the fin. Similar brazing defects may also occur at the joint between the header and the tube. When the thickness of the tubes and fins is thin, Mg not only causes brazing failure as described above, but also diffuses from the material to the material surface during brazing and the amount of Mg in the core material The significant decrease causes a decrease in strength after brazing. Furthermore, in the conventional three-layer aluminum alloy composite material in which the brazing material, the core material, and the sacrificial anode material each have one layer, the core material has 0.3 Wt.
% Of Mg is added, the Si and Mg in the core material are M
As a compound of g ₂ Si, a large amount is precipitated at the grain boundaries, and this precipitate causes a problem such as intergranular corrosion.

[0005]

DISCLOSURE OF THE INVENTION The present invention, particularly in an aluminum alloy composite material used as a thin-walled radiator tube material, prevents deterioration of brazing property due to diffusion of Mg from the core material into the brazing material, and This is an aluminum alloy composite material that has high strength and high corrosion resistance after brazing. That is, the invention according to claim 1 is such that a brazing material of an Al-Si alloy is provided on one surface of the core material and an Al-Zn alloy, an Al-Zn alloy, or an Al-Zn-Mg alloy on the other surface. In the aluminum alloy composite material clad with the sacrificial anode material, the core material has a two-layer structure, and the brazing material side core material is Mn.
0.5-1.5 wt%, Cu 0.3-1.5 wt%, Si
An Al alloy containing 0.2 to 1.5 wt% and Mg 0.2 wt% or less and the balance Al and unavoidable impurities, and the sacrificial anode material side core material is 0.5 wt% or less of Si and exceeds 1.5 wt% of Mg. 4.0 wt% or less, Cu over 0.3 wt%, 1.5
wt% or less, Mn 0.5-1.5 wt%, balance Al
And an unavoidable impurity, wherein the thickness of the brazing filler metal side core material is 30% or more of the total thickness of the core material, which is a high strength and corrosion resistant aluminum alloy composite material for a heat exchanger. . In the invention according to claim 2, Al is provided on one surface of the core material.
-Si-based alloy brazing material, Al-Zn-based alloy on the other surface,
In an aluminum alloy composite material in which a sacrificial anode material such as an Al-Mg-based alloy or an Al-Zn-Mg-based alloy is clad, the core material has a two-layer structure, and the brazing material-side core material is Mn0.5.
~ 1.5wt%, Cu0.3 ~ 1.5wt%, Si0.2 ~
1.5 wt% and Mg 0.2 wt% or less, and 0.05 to 0.3 wt% of each of Cr, Zr, and Ti of one or more kinds, and the balance Al and unavoidable impurities. Made of Al alloy and the core material on the side of the sacrificial anode material is Si0.5
wt% or less, Mg over 1.5 wt%, 4.0 wt% or less, C
u more than 0.3 wt% and 1.5 wt% or less, Mn 0.5 to
For a heat exchanger, characterized in that it is an Al alloy containing 1.5 wt% and the balance is Al and unavoidable impurities, and the thickness of the brazing material side core material is 30% or more of the total thickness of the core material. It is a high strength and high corrosion resistance aluminum alloy composite material. The invention according to claim 3 is a sacrifice such as a brazing material of an Al-Si alloy on one surface of the core material and an Al-Zn alloy, an Al-Mg alloy, or an Al-Zn-Mg alloy on the other surface. In an aluminum alloy composite material in which an anode material is clad, the core material has a two-layer structure, the brazing material side core material has Mn of 0.5 to 1.5 wt% and Cu.
0.3-1.5 wt%, Si 0.2-1.5 wt%, Mg
An Al alloy containing 0.2 wt% or less and the balance Al and unavoidable impurities is used.
wt% or less, Mg over 1.5 wt%, 4.0 wt% or less, C
u more than 0.3 wt% and 1.5 wt% or less, Mn 0.5 to
Containing 1.5wt%, each 0.05 ~ 0.3wt%
Of Cr, Zr, and Ti, and an Al alloy containing the balance Al and inevitable impurities, and the thickness of the brazing material side core material is 30% of the total thickness of the core material. The above is a high-strength and high-corrosion-resistant aluminum alloy composite material for heat exchangers. In the invention according to claim 4, the brazing material of the Al-Si alloy is provided on one surface of the core material, and the Al material is provided on the other surface of the core material.
-Zn alloy, Al-Mg alloy, or Al-Zn-
In an aluminum alloy composite material in which a sacrificial anode material such as a Mg-based alloy is clad, the core material has a two-layer structure, the brazing material side core material is Mn 0.5 to 1.5 wt%, and Cu is 0.3 to 1.5 wt.
%, Si 0.2 to 1.5 wt%, Mg 0.2 wt% or less, and 0.05 to 0.3 wt% Cr, Zr, and
An Al alloy containing one or more of Ti and the balance Al and unavoidable impurities, and the sacrificial anode material side core material has Si of 0.5 wt% or less and Mg of more than 1.5 wt%.
It contains 4.0 wt% or less, more than Cu 0.3 wt%, 1.5 wt% or less, and Mn 0.5 to 1.5 wt%, and each of them has a content of 0.
An Al alloy containing 05 to 0.3 wt% of one or more of Cr, Zr, and Ti, and the balance Al and unavoidable impurities, and the thickness of the brazing material side core material is the entire core material. Is 30% or more of the thickness of the aluminum alloy composite material for a heat exchanger.

In the invention according to any one of claims 1 to 4, the sacrificial anode material contains 1.3 to 6.0 wt% Zn, and 0.01 to 1.0 wt% Sn, I if necessary.
n 0.01 to 1.0 wt%, Ga 0.01 to 1.0 wt%,
Al alloy containing one or more of 0.01 to 0.5 wt% of Ti and 0.3 to 1.5 wt% of Mn, with the balance Al and unavoidable impurities, Mg 0.5 to 4.0 wt%
Containing 0.01 to 1.0 wt% Sn, if necessary.
%, In 0.01 to 1.0 wt%, Ga 0.01 to 1.0
wt%, Ti 0.01-0.5 wt%, Mn 0.3-1.5
Al alloy containing 1% or 2 or more of wt% and balance Al and inevitable impurities, and Mg 0.5 to
4.0 wt%, Zn 1.0-6.0 wt%, and if necessary, Sn0.01-1.0 wt%, In0.01
~ 1.0 wt%, Ga0.01-1.0 wt%, Ti0.0
An Al alloy containing 1 to 0.5 wt% and 0.3 to 1.5 wt% of Mn or one or more of Mn and the balance Al and unavoidable impurities is desirable.

[0007]

In the present invention, the core material has a double structure, and a material containing less Mg is used as the core material on the brazing material side (hereinafter referred to as A material) to reduce the diffusion of Mg into the brazing material. It has a function of preventing the deterioration of the stickiness and, at the same time, suppressing the intergranular corrosion due to the intergranular precipitation of Mg ₂ Si. A material having a high Mg content is used for the core material on the side of the sacrificial anode material (hereinafter referred to as "material B") to improve the strength, and due to the diffusion of Mg during brazing, the material B portion is second Since it becomes the sacrificial anode material, the pitting corrosion resistance of the aluminum alloy composite material can be further improved. Further, Cu is added to improve strength and corrosion resistance. Furthermore, by setting the thickness of A material containing less Mg to 30% or more of the total thickness of the core material, intergranular corrosion due to Mg ₂ Si is suppressed, and the balance of strength, brazing property and corrosion resistance is maintained. The characteristics of are improved.

The reasons for adding the additional elements and the reasons for limiting the addition amount in materials A and B will be described below. In material A,
Mn is added to improve strength and corrosion resistance, and the amount added is 0.5 to 1.5 wt% (hereinafter abbreviated as%). This is because the plastic workability is deteriorated when it exceeds. Cu is added to improve strength and corrosion resistance, and the addition amount is 0.3 to
1.5% is not effective if less than 0.3% 1.5
This is because if it exceeds%, the plastic workability decreases. After brazing, Si forms a solid solution in the matrix and is effective in improving strength. The reason why the amount added is 0.2 to 1.5% is that if it is less than 0.2%, the effect is small, and if it exceeds 1.5%, the amount of elemental Si increases, the plastic workability deteriorates, and further Mg ₂ Si This is because there is a risk of causing intergranular corrosion due to intergranular precipitation. Si forms a compound of Mg and Mg ₂ Si and is effective in improving the strength after brazing. If it is less than 0.3%, the effect is small, and if it exceeds 1.0%, the corrosion resistance and plastic workability are deteriorated. In the present invention, Mg in the B material is diffused into the A material when the brazing heat is applied to form Si and Mg ₂ Si in the A material to improve the strength. Mg has the effect of improving the strength after brazing, but if added in excess of 0.2%, it diffuses to the brazing material side and reduces brazing properties, and reacts with Si to reduce Mg.
Since there is a risk of causing intergranular corrosion due to the intergranular precipitation of ₂ Si, the content is made 0.2% or less. Cr, Zr, and Ti all have an effect of improving strength, but if each is less than 0.05%, they have no effect, and if they exceed 0.3%, a huge compound is formed to reduce plastic workability. Although it is preferable to add Fe to the extent of impurities in the 3003 alloy, the smaller the amount, the better the corrosion resistance.

In material B, Si is solid-solved in the matrix and is effective in improving strength. The addition amount is set to 0.5% or less because the content of Mg ₂ S is more than 0.5%.
There is a risk of causing intergranular corrosion due to intergranular precipitation of i,
Further, it is because there is a possibility of melting during brazing depending on the amount added to the core material. Mg has an improvement in strength after brazing, and the reason why the addition amount is limited to more than 1.5% and 4.0% or less is that there is no effect at 1.5% or less, and if it exceeds 4.0%, Even if the ratio of the thickness of material B to the total thickness of the two-layer core material satisfies the specified conditions, the amount of Mg ₂ Si compound grain boundary precipitates associated with melting or diffusion during brazing increases, which causes This is because inter field corrosion may be caused, and the number of corroded portions increases, causing problems such as deterioration of corrosion resistance. Mn is added to improve strength and corrosion resistance, and the amount added is 0.5 to 1.5%. If it is less than 0.5%, there is no effect, and if it exceeds 1.5%, plastic workability is deteriorated. Because it will decrease. Cu has an effect of improving the strength, but if it is less than 0.3%, the effect is small, and if it exceeds 1.5%, not only the plastic workability deteriorates, but also C on the sacrificial layer side.
This is because a large amount of u is diffused, so that the sacrificial anode effect of the sacrificial layer is reduced and the corrosion resistance of the aluminum alloy composite material for the heat exchanger is deteriorated. Cr, Zr, and Ti are all effective in improving strength, but if each is less than 0.05%, they have no effect, and if over 0.3%, a huge compound is formed and plastic workability is deteriorated. Although it is preferable to add Fe to the extent of impurities in the 3003 alloy, the smaller the amount, the better the corrosion resistance.

In the present invention, the brazing filler metal core material (A material)
The reason why the thickness is specified to be 30% or more of the thickness of the whole core material will be described below. The thickness of A material with less Mg is 3 of the thickness of the whole core.
When it is less than 0%, that is, the ratio of B material containing a large amount of Mg is 70
If it exceeds 0.1%, theoretically, the strength is improved by the amount of Mg, but in reality, there may be a phenomenon that the strength is decreased depending on the Mg content. This is presumably because the material A has a smaller layer thickness than the material B, and thus a large amount of Mg is concentrated on the surface of the brazing material by brazing, and the strength of the core material due to the addition of Mg is lowered more than expected. Further, in this case, there is a problem that the brazing property is significantly deteriorated. Moreover, accompanied when the ratio of the A material thickness is less than 30%, in order toward the high B material thickness of the Mg quantity is thicker than material A, after brazing, the grain boundary precipitates such as the Mg ₂ Si compound The intergranular corrosion site expands, which accelerates the progress of corrosion and may lead to early penetration, resulting in the loss of the function as the aluminum alloy composite material for the heat exchanger. Therefore, for a heat exchanger that suppresses a large amount of Mg concentration on the brazing surface due to brazing and suppresses the amount of intergranular corrosion due to Mg ₂ Si, etc., and improves the balance of strength, brazing property, and corrosion resistance. To provide aluminum alloy composites,
It is necessary that the ratio of the material A thickness to the total thickness of the two-layer core material is 30% or more.

In the present invention, only Zn is essential for the sacrificial anode material, M
By adding only g, or Zn and Mg, it is possible to improve the corrosion resistance, and particularly to add Mg to further improve the strength of the composite material in the sacrificial anode material. Further, if necessary, one or more of Sn, In, Ga, Ti, and Mn are added to further improve the corrosion resistance of the composite material. The reasons for adding the additional elements and the reasons for limiting the addition amount in the sacrificial anode material will be described below. In the sacrificial anode material, Zn and Mg have the effect of suppressing the progress of corrosion and improving the corrosion resistance. Further, the addition of Mg improves the strength of the sacrificial material itself, and the strength of the core material is also improved due to the diffusion into the core material by the heat applied by the brazing, which greatly contributes to the improvement of the strength of the composite material. In claim 5, the amount of Zn added is limited to 1.3 to 6.0% because the above effect cannot be obtained if less than 1.3%.
%, The potential becomes too base and pitting corrosion can be prevented, but the amount of corrosion of the sacrificial anode layer increases, and the large amount of corrosion products can cause clogging of the heat transfer tube. is there. Further, the sacrificial anode effect is further improved by adding one or more of Sn, In, and Ga within the above range, if necessary. Claim 6
In the above, the reason why the amount of Mg added is limited to 0.5 to 4.0% is that the above effect cannot be obtained if it is less than 0.5%, and the amount is 4.0%.
If it exceeds the range, problems occur in the clad production and rollability, and there is a risk of melting depending on the clad ratio of the sacrificial material and the brazing heat addition conditions at high temperatures. In claim 7, the amount of Zn added is limited to 1.0 to 6.0% of Zn. The above effect cannot be obtained if the amount of Zn is less than 1.0 in composite addition with Mg in the sacrificial material, and exceeds 6.0%. This is because the potential becomes too base and pitting corrosion can be prevented, but the amount of corrosion of the sacrificial anode layer increases, and a large amount of corrosion products may cause clogging of the heat transfer tube. Mg to Z
By limiting the content of Mg to 0.5 to 4.0% in the composite addition with n, the pitting corrosion resistance can be further improved and the strength of the composite material can be improved as compared with the Zn essential addition. Mg
If it is less than 0.5%, the above effect cannot be obtained, and if it exceeds 4.0%, problems occur in the clad production and rollability, and there is a risk of melting depending on the clad ratio of the sacrificial anode material and the heating conditions for brazing at high temperature. It will happen. Claim 5 of the present invention,
In 6 and 7, Sn, In, and Ga make the sacrificial anode material more base in terms of electric potential than the core material so that the sacrificial anode effect is exerted on the core material. The Sn addition amount is 0.01 to 1.
0%, In 0.01 to 1.0%, Ga 0.01 to 1.0
%, The above effect is not obtained when the content is less than 0.01%, and the potential becomes too base when the content exceeds 1.0%, and the corrosion amount of the sacrificial anode layer increases even though pitting corrosion can be prevented. However, a large amount of corrosion products may cause problems such as clogging the heat transfer tubes. Ti has an effect of improving pitting corrosion resistance, but if it is less than 0.01%, it has no effect, and if it exceeds 0.5%, workability is deteriorated. By adding Mn to the sacrificial anode material, it is possible to contribute to improving the strength of the composite material. The addition amount is specified as 0.3 to 1.5% because it has no effect if less than 0.3%,
This is because the problem of deterioration of plastic workability arises when it exceeds.

In the aluminum alloy composite material for a heat exchanger of the present invention, the brazing material has a suitable clad ratio of about 3 to 15%. When considering the balance between strength and corrosion resistance, the clad ratio of the sacrificial anode material is 1 depending on the amount of alloying elements added.
It is said that 0 to 40% is good.

The aluminum alloy composite material of the present invention is mainly used as a tube material, but it can also be used as a header material of a radiator and can be used as any other member as long as it is the same as the object of the present invention. Further, the brazing method is not specified, and it can be used as a material for a heat exchanger that is brazed by a flux brazing method, a vacuum brazing method, or another brazing method. As a brazing material, Al-Si based JI
S4343 (Al-7.5% Si) alloy, JIS404
5 (Al-10% Si) alloy, JIS 4047 (Al-
12% Si) alloy, and 4004 (Al-10% Si)
-1.5% Bi) alloy, Al-10% Si-1.5% M
A small amount of other element may be added to the g-0.1% Bi alloy or the like or other brazing material for the purpose of improving brazing property and corrosion resistance.

[0014]

EXAMPLES The present invention will now be described in more detail with reference to examples. Example 1 As Examples relating to claims 1 to 4 of the present invention, 16 kinds of brazing material side core materials, 16 kinds of sacrificial anode material side core materials, and 3003 alloy shown in Tables 1 and 2 were cast by die casting, respectively. Finished by cutting both sides. Regarding the finish thickness, the finish was performed so that each core thickness ratio occupying the entire core ingot thickness of 40 mm was different. The brazing material is 4343 alloy, and the sacrificial anode material is Al-
A 1.5% Zn-0.5% Mg alloy was used, all were cast in the same manner as the core material, and after face-shaping, hot-rolled to a thickness of 5 mm. Four pieces of a brazing material, a brazing material side core material, a sacrificial anode material side core material, and a sacrificial anode material were stacked in this order, and hot rolled at 500 ° C. to obtain a four-layer clad material. After that, it is cold-rolled to have a thickness of 0.35 mm, is subjected to intermediate annealing at 330 ° C. for 2 hours, and finally cold-rolled to a thickness of 0.25 mm.
14 samples were used. The strength, brazing property and corrosion resistance of these samples were measured by the following methods. Strength: 600 ° C. × 10 min. After heat of brazing, 1
00 ° C / min. Cooling at a cooling rate of
After standing for one day, the tensile strength was measured. Brazing property: A corrugated 0.13 mm thick 3003 alloy fin material and this sample are combined as a core as shown in Fig. 2, and the core is dipped in a 3% fluoride-based flux aqueous solution to form a flux. Is applied and dried at 200 ° C.,
600 ° C. × 3 min. In inert gas. The heat of brazing was applied to measure the bonding rate with the fin. When the bonding rate is 90% or more, the brazing property is good. Corrosion resistance: After applying the same brazing heat as the strength measurement sample, seal the brazing filler metal side and end (refrigerant side) surface, and in tap water + 20 ppm Cu ⁺ at 90 ° C high temperature water for 8 h
The cycle immersion test of r for 16 hours at room temperature was performed for 4 months to measure the maximum pitting depth generated in the sample. The above measurement results are shown in Tables 3 and 4.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

[Table 3]

[0018]

[Table 4]

As is apparent from Tables 3 and 4, the invention sample N
o. Nos. 1 to 25 have a strength after brazing of 20 kgf / mm ² or more and a conventional example No. 3 having a core material of 3003 alloy. It is higher than 37, the brazing joint ratio is 90% or more, and the corrosion resistance is also good. On the other hand, Comparative Example No. 26, 27, 28, 2
9, 30, 31, 33, and 35 have lower strength than the examples of the present invention. Comparative Example No. No. 34 has a high strength, but the brazing joint ratio is as low as 5% or less, and the pitting corrosion depth after the immersion test is 0.25.
Since the through-holes have already been formed, the brazing property and the corrosion resistance are much worse than those of the examples of the present invention. In addition, Comparative Example No.
Nos. 31 and 33 have a high brazing joining ratio and are excellent in brazing property, but the strength is 17 kgf / mm ² or less. No. 31
With respect to (1), since the pitting corrosion depth after the immersion test was 0.25 mm and through holes were already formed, the strength was lower than that of the present invention and the corrosion resistance was very poor. In addition, No. In No. 33, the pitting depth after the immersion test does not reach the through hole, but the strength is considerably lower than that of the examples of the present invention. Comparative Example No. 26, 27, 28, 2
9, 30, 31, and 35 have a pitting corrosion depth of 0.2 after the immersion test.
Although the through hole is already formed with 5 mm, this is because the amount of Mg in the brazing material side core material exceeds the amount specified by the present invention, or the amount of Si in the sacrificial anode material side core material exceeds the amount specified by the present invention. From this, it is considered that the intergranular corrosion was caused by the intergranular precipitation of Mg ₂ Si. In addition, Comparative Example No. Reference numeral 34 denotes a core material composed of one layer of core material having only the sacrifice anode material side core material symbol B5 of the present invention.
Since a large amount of is included, intergranular corrosion is caused, resulting in the formation of through holes after the immersion test. During brazing, M reacts with Mg in the core material and flux on the surface of the brazing material.
Since a large amount of the gF-based compound is produced, the brazing property is poor, and due to the large amount of diffusion of Mg on the surface of the brazing material, the strength tends to decrease unexpectedly. Comparative Example No. 32 is the amount of Si and Mg in the brazing material side core material and M in the sacrificial anode material side core material
Since the amount g is added in excess of the specified amount of the present invention,
The material melts during brazing and loses its function as a composite material for heat exchangers. Comparative Example No. No. 36 has a core material component within the range specified by the present invention (combination material of A3 and B4), but the thickness ratio of each core material to the total thickness of the core material is out of the range defined by the present invention, that is, the core material of the brazing material Since the ratio is 20%, the strength is higher than that of the conventional example, but the brazability and corrosion resistance are considerably worse than those of the examples of the present invention and the conventional examples. Furthermore, the conventional example No. in which the core material is a 3003 alloy single layer. No. 37 has excellent brazing property, but its strength is low, so that it cannot satisfy the characteristics as a high strength, high corrosion resistance aluminum alloy composite material.

Example 2 As an example according to claim 5 of the present invention, 14 kinds of sacrificial anode materials shown in Table 5, 12 kinds of sacrificial anode materials shown in Table 6 as examples of claim 6 and an embodiment related to claim 7 are carried out. As an example, 12 kinds of sacrificial anode materials shown in Table 7 were cast by die casting, both surfaces were ground, and hot rolled to a thickness of 5 mm. The core materials clad with the sacrificial anode material of the present invention shown in Tables 5 and 6 were the same as those of Example No. 1 of the present invention shown in Table 3 of Example 1. 1
The same material as 2 (combination material of A3 and B4) was used. The core material clad with the sacrificial anode material of the present invention shown in Table 7 was the same as that of Example No. 1 of the present invention shown in Table 3 of Example 1. 8 (A2, B
The same material as the combination material 5) was used. As the core material clad with the conventional sacrificial anode material, the conventional example 3003 described in Table 4 of Example 1 was used. The brazing material uses 4343 alloy,
After casting, chamfering, hot rolling was performed to a thickness of 5 mm. Brazing material, brazing material side core material, sacrificial anode material side core material, sacrificial anode material 4
The sheets were stacked in this order and hot rolled at 500 ° C. to obtain a clad material having four layers. After that, it is cold rolled to 0.
The sample was made of H14 material with a thickness of 35 mm, intermediate annealing of 330 ° C. × 2 hr, and finally cold-rolled to a thickness of 0.25 mm. For these samples, strength, brazeability,
The corrosion resistance was measured by the same method as in Example 1. The above results are shown in Tables 5, 6, and 7.

[0021]

[Table 5]

[0022]

[Table 6]

[0023]

[Table 7]

As is apparent from Table 5, the invention claimed in claim 5
By using the sacrificial anode material defined in 1., the invention examples (substitute with the symbol of the sacrificial anode material) D1 to D13 have a strength after brazing of 20 kgf / mm ² or more and the conventional example D14 using the 3003 alloy as the core material. While maintaining a much higher level, the maximum pitting depth after the immersion test is smaller than in the case of using the conventional sacrificial anode material, and the corrosion resistance is improved. As is clear from Table 6, by using the sacrificial anode material defined in claim 6 of the present invention, the inventive examples (substitute with the symbol of the sacrificial anode material) E1 to E11 have a strength after brazing of 21 kgf.
/ Mm ² or more and conventional example D14 using 3003 alloy as core material
The maximum pitting depth after the immersion test is smaller than that in the case of using the conventional sacrificial anode material, and the corrosion resistance is improved, while maintaining a much higher level than As is apparent from Table 7, by using the sacrificial anode material defined in claim 7 of the present invention, examples of the present invention (substitute with the symbol of the sacrificial anode material) F1 to
F11 has strength after brazing of 21 kgf / mm ² or more and 3
The maximum pitting depth after the immersion test is smaller than that in the case of using the conventional sacrificial anode material, and the corrosion resistance is improved, while maintaining the level far higher than that of the conventional example D14 using the 003 alloy as the core material. .

[0025]

As described above, the aluminum alloy composite material for a heat exchanger according to the present invention can improve the respective properties while maintaining the balance of strength, brazing property and corrosion resistance as compared with the conventional example. It has a remarkable industrial effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structure of a radiator for an automobile.

FIG. 2 is a view showing a brazing heat core for determining the brazing property of an aluminum alloy composite material.

[Explanation of symbols]

 1 tube 2 fins 3 header 4 tank 5 tube material

Claims (7)

[Claims] 1. A brazing material of an Al--Si alloy on one surface of a core material, and a sacrificial anode material such as an Al--Zn alloy, an Al--Mg alloy, or an Al--Zn--Mg alloy on the other surface. In the clad aluminum alloy composite material, the core material has a two-layer structure, the brazing material side core material is Mn 0.5 to 1.5 wt%, Cu
0.3-1.5 wt%, Si 0.2-1.5 wt%, Mg
An Al alloy containing 0.2 wt% or less and the balance Al and unavoidable impurities is used.
wt% or less, Mg over 1.5 wt%, 4.0 wt% or less, C
u more than 0.3 wt% and 1.5 wt% or less, Mn 0.5 to
For a heat exchanger, characterized in that it is an Al alloy containing 1.5 wt% and the balance is Al and unavoidable impurities, and the thickness of the brazing material side core material is 30% or more of the total thickness of the core material. Aluminum alloy composite with high strength and high corrosion resistance. 2. A brazing material of an Al--Si alloy on one surface of the core material, and a sacrificial anode material such as an Al--Zn alloy, an Al--Mg alloy, or an Al--Zn--Mg alloy on the other surface. In the clad aluminum alloy composite material, the core material has a two-layer structure, the brazing material side core material is Mn 0.5 to 1.5 wt%, Cu
0.3-1.5 wt%, Si 0.2-1.5 wt%, Mg
Contains less than 0.2 wt%, each 0.05 ~ 0.3
An Al alloy containing 1 wt% or more of Cr, Zr, and Ti of wt% and the balance Al and inevitable impurities is used, and the sacrificial anode material side core material is Si 0.5 wt% or less, Mg
An Al alloy containing more than 1.5 wt% and 4.0 wt% or less, Cu more than 0.3 wt% and 1.5 wt% or less, and Mn of 0.5 to 1.5 wt% with the balance Al and unavoidable impurities. A high-strength, high-corrosion-resistant aluminum alloy composite material for a heat exchanger, wherein the brazing material-side core material has a thickness of 30% or more of the total thickness of the core material. 3. A brazing material of an Al--Si alloy on one surface of the core material, and a sacrificial anode material such as an Al--Zn alloy, an Al--Mg alloy, or an Al--Zn--Mg alloy on the other surface. In the clad aluminum alloy composite material, the core material has a two-layer structure, the brazing material side core material is Mn 0.5 to 1.5 wt%, Cu
0.3-1.5 wt%, Si 0.2-1.5 wt%, Mg
An Al alloy containing 0.2 wt% or less and the balance Al and unavoidable impurities is used.
wt% or less, Mg over 1.5 wt%, 4.0 wt% or less, C
u more than 0.3 wt% and 1.5 wt% or less, Mn 0.5 to
Containing 1.5wt%, each 0.05 ~ 0.3wt%
Of Cr, Zr, and Ti, and an Al alloy containing the balance Al and unavoidable impurities, and the thickness of the brazing material side core material is 30% of the total thickness of the core material. A high-strength and high-corrosion-resistant aluminum alloy composite material for a heat exchanger, which is characterized by the above. 4. A brazing material of an Al--Si alloy on one surface of the core material, and a sacrificial anode material such as an Al--Zn alloy, an Al--Mg alloy, or an Al--Zn--Mg alloy on the other surface. In the clad aluminum brazing sheet, the core material has a two-layer structure, and the brazing material side core material has Mn of 0.5 to 1.5 wt.
%, Cu 0.3 to 1.5 wt%, Si 0.2 to 1.5 wt
%, Mg 0.2 wt% or less, and each 0.05
~ 0.3 wt% of Cr, Zr, or Ti, or 2
Al alloy containing at least seeds and the balance Al and unavoidable impurities, the core material on the side of the sacrificial anode material is 0.5 wt% or less of Si, more than 1.5 wt% of Mg, 4.0 wt% or less, Cu 0.
More than 3 wt% and less than 1.5 wt%, Mn 0.5-1.5 wt
%, And each of 0.05 to 0.3 wt% Cr,
An Al alloy containing one or more of Zr and Ti, the balance being Al and unavoidable impurities, and the thickness of the brazing material side core material being 30% or more of the thickness of the entire core material. An aluminum alloy composite material characterized by the above. 5. The sacrificial anode material contains Zn 1.3 to 6.0 wt%, and if necessary, Sn 0.01 to 1.0 wt%.
%, In 0.01 to 1.0 wt%, Ga 0.01 to 1.0
wt%, Ti 0.01-0.5 wt%, Mn 0.3-1.5
The high-strength and high-corrosion-resistant aluminum for a heat exchanger according to any one of claims 1 to 4, which is an Al alloy containing one or more of wt% and the balance Al and inevitable impurities. Alloy composite. 6. The sacrificial anode material contains 0.5 to 4.0 wt% of Mg, and if necessary, 0.01 to 1.0 wt% of Sn.
%, In 0.01 to 1.0 wt%, Ga 0.01 to 1.0
wt%, Ti 0.01-0.5 wt%, Mn 0.3-1.5
The high-strength and high-corrosion-resistant aluminum for a heat exchanger according to any one of claims 1 to 4, which is an Al alloy containing one or more of wt% and the balance Al and inevitable impurities. Alloy composite. 7. The sacrificial anode material is Mg 0.5 to 4.0 wt%,
Zn 1.0-6.0 wt%, Sn 0.01-1.0 wt%, In 0.01-1.0 wt%
%, Ga 0.01 to 1.0 wt%, Ti 0.01 to 0.5
A containing at least one of wt% and Mn of 0.3 to 1.5 wt%, or the balance Al and unavoidable impurities
The high-strength and high-corrosion-resistant aluminum alloy composite material for a heat exchanger according to any one of claims 1 to 4, which is an L alloy.