JP2011038163A - Aluminum-clad material for heat-exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum-clad material for heat-exchanger which is excellent in fatigue resistance, has excellent corrosion-resistance, and can suitably be used as the material of a tube material and plate material for aluminum alloy-made heat-exchanger. <P>SOLUTION: In the two-layer clad material of the aluminum constituted by cladding one-side surface of this core material with a skin material 1 having a sacrificial anode effect to a core material, the core material is composed of ≥99.0% aluminum purity and <1.0% content of inevitable impurities, and each content of Cu, Mn, Mg contents in the inevitable impurities is defined as ≤0.05%. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger manufactured by brazing joint, such as brazing using a fluoride-based flux or vacuum brazing, particularly when manufacturing an aluminum alloy heat exchanger such as a radiator or an inverter cooler. In addition, it is related with the aluminum clad material used suitably as the tube material and plate material which are the structural members.

  The aluminum alloy heat exchanger tube material is an aluminum alloy clad material having a two-layer structure in which an Al-Mn alloy alloy is used as a core material, and an Al-Si alloy brazing material is clad on one side of the core material. An aluminum alloy clad material having a three-layer structure in which a material is clad and a sacrificial anode material of an Al—Zn alloy or an Al—Zn—Mg alloy is clad on the other surface is used.

  In aluminum alloy heat exchangers, the core material of the clad material keeps the shape as a structural member, has a stress relaxation effect against vibration, pressure fluctuation, and thermal stress applied to the heat exchanger, and exhibits fatigue durability To do. In addition, the Al—Si brazing material is clad to braze and join the members together when an aluminum alloy heat exchanger is manufactured. Further, the sacrificial anode material is used, for example, on the inner surface or the outer surface of the tube, and exerts a sacrificial anode action in contact with the working fluid or the outside air, thereby preventing the pitting corrosion of the core material.

JP 11-293371 A

  Especially in aluminum alloy heat exchangers for automobiles, it is important to have fatigue characteristics that can withstand fatigue due to stresses such as vibrations applied to the heat exchanger, and tube materials and plate materials also have excellent fatigue durability. What is needed is desired. In order to obtain a tube material having excellent fatigue characteristics and excellent corrosion resistance, the present invention has reviewed the composition of the core material and the sacrificial anode material constituting the cladding material and the combination thereof, and the relationship with the fatigue properties of the cladding material. As a result of conducting tests and studies on the above, as a core material, pure aluminum in which the amount of component elements added was suppressed was used, the generation of intermetallic compounds produced by the component elements was suppressed, and the solid solubility of Cu, Mn, and Mg was reduced. It has been found that this is effective for improving the fatigue life, particularly for improving the low cycle fatigue life.

  The present invention was made as a result of repeated testing and examination based on the above knowledge, and the object thereof is excellent in fatigue characteristics and excellent corrosion resistance, and is a tube material for an aluminum alloy heat exchanger. An object of the present invention is to provide an aluminum clad material for a heat exchanger that can be suitably used as a material for a plate material.

  An aluminum clad material for a heat exchanger according to claim 1 for achieving the above object is an aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material. The core material has an aluminum purity of 99.0% or more, the content of inevitable impurities is less than 1.0%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all 0.05%. It consists of the following pure aluminum, It is characterized by the above-mentioned.

  An aluminum clad material for a heat exchanger according to claim 2 is an aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material. It is 99.9% or more, the content of inevitable impurities is less than 0.1%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all made of pure aluminum with 0.005% or less. Features.

  An aluminum clad material for a heat exchanger according to claim 3 is an aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity 99.99% or more, the content of inevitable impurities is less than 0.01%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all made of pure aluminum with 0.0005% or less. Features.

  An aluminum clad material for a heat exchanger according to claim 4 is an aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity 99.999% or more, the content of unavoidable impurities is less than 0.001%, and the contents of Cu, Mn, and Mg among the unavoidable impurities are all made of pure aluminum of 0.00005% or less. Features.

  The aluminum clad material for heat exchanger according to claim 5 is an aluminum two-layer clad material obtained by clad the skin material 1 having a sacrificial anode effect on the core material on one side of the core material, and the core material is Ti: It contains less than 0.3%, the aluminum purity is 99.0% or more, the content of inevitable impurities is less than 0.7%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all 0 .05% or less of aluminum.

  The aluminum clad material for a heat exchanger according to claim 6 is an aluminum two-layer clad material obtained by clad the skin material 1 having a sacrificial anode effect on the core material on one side of the core material, and the core material is Ti: It contains less than 0.05%, aluminum purity is 99.9% by mass or more, the content of inevitable impurities is less than 0.05%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all It consists of 0.005% or less of aluminum.

  The aluminum clad material for a heat exchanger according to claim 7 is an aluminum two-layer clad material obtained by clad the skin material 1 having a sacrificial anode effect on the core material on one side of the core material, and the core material is Ti: It contains less than 0.005%, aluminum purity is 99.99 mass% or more, the content of inevitable impurities is less than 0.005%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all It consists of 0.0005% or less of aluminum.

  An aluminum clad material for a heat exchanger according to claim 8 is a two-layer clad material made of an aluminum alloy obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, wherein the core material is Ti : Containing less than 0.0005%, aluminum purity is 99.999% by mass or more, content of inevitable impurities is less than 0.0005%, content of Cu, Mn, Mg among inevitable impurities is Both are characterized by being made of 0.00005% or less pure aluminum.

  The aluminum clad material for a heat exchanger according to claim 9 is the aluminum clad material for heat exchanger according to any one of claims 1 to 8, wherein the skin material 1 is Zn: 0.5 to 10%, In: 0.001 to 0.1%, Sn: It is characterized by comprising one or more of 0.001 to 0.1% or less, and being composed of an aluminum alloy composed of the balance Al and inevitable impurities.

  The aluminum clad material for a heat exchanger according to claim 10 is the aluminum clad material for heat exchanger according to claim 9, wherein the skin material 1 further comprises Mn: 0.1 to 1.8%, Fe: 0.1 to 2.0%, Si: 0. 0.1-2.0%, Ni: 0.1-2.0%, Cr: 0.01-0.3%, Zr: 0.01-0.3%, Ti: 0.01-0.35 % Or less of 1% or less.

  An aluminum clad material for a heat exchanger according to claim 11 is provided with an Al-Si alloy brazing material or Al on the core surface opposite to the skin material 1 of the aluminum clad material for heat exchanger according to any one of claims 1 to 10. A clad material 2 made of a Si—Mg alloy brazing material is clad to form a three-layer clad material.

  An aluminum clad material for a heat exchanger according to a twelfth aspect of the present invention is the aluminum clad material for a heat exchanger according to the eleventh aspect, wherein the skin material 2 contains Si: 2.5 to 14%, and is composed of an aluminum alloy brazing material comprising the balance Al and inevitable impurities. It is characterized by that.

  The aluminum clad material for heat exchanger according to claim 13 is the aluminum clad material for heat exchanger according to claim 12, wherein the skin material 2 is further Mg: 0.1-2.0%, Fe: 0.1-2.0%, Mn: 0.00. 1 to 2.0%, Ti: 0.01 to 0.3%, Zn: 0.5 to 5.0%, Cu: 0.1 to 5.0%, Sr: 0.001 to 0.1% , Na: 0.001-0.1%, Sb: 0.001-0.1%, Bi: 0.001-0.2%, Be: 0.001-0.1% or less Or it contains 2 or more types, It is characterized by the above-mentioned.

  The aluminum clad material for a heat exchanger according to claim 14 has a sacrificial anode effect on the core material on the core material surface opposite to the skin material 1 of the aluminum clad material for heat exchanger according to any one of claims 1 to 10. A clad material 2 made of an aluminum alloy is clad to form a three-layer clad material.

  The aluminum clad material for heat exchanger according to claim 15 is the aluminum clad material for heat exchanger according to claim 14, wherein the skin material 2 is Zn: 0.5 to 10%, In: 0.001 to 0.1%, Sn: 0.001 to 0 It is characterized by being composed of an aluminum alloy containing one or more of 1% or less and the balance Al and inevitable impurities.

  The aluminum clad material for a heat exchanger according to claim 16 is the aluminum clad material for heat exchanger according to claim 15, wherein the skin material 2 further comprises Mn: 0.1 to 1.8%, Fe: 0.1 to 2.0%, Si: 0. 0.1-2.0%, Ni: 0.1-2.0%, Cr: 0.01-0.3%, Zr: 0.01-0.3% or less, Ti: 0.01-0. It contains one or more of 35% or less.

The aluminum clad material for a heat exchanger according to claim 17 is the metal clad according to any one of claims 1 to 16, wherein among the intermetallic compounds in the matrix of the core material, the particle diameter (equivalent circle diameter, the same shall apply hereinafter) The total number of the compounds is 3 × 10 ⁴ or less per 1 mm ² .

  According to the present invention, an aluminum clad material having excellent fatigue characteristics, particularly low cycle fatigue characteristics, and excellent corrosion resistance, particularly suitable as a material for a tube material or a plate material that is a constituent member of an aluminum alloy heat exchanger. An aluminum alloy clad material for a heat exchanger that can be used is provided.

It is a figure which shows the outline of the bending fatigue testing machine of an aluminum clad material.

The significance and reasons for limitation of the alloy components in the aluminum clad material for heat exchangers according to the present invention will be described.
(Heartwood)
By using pure aluminum having an inevitable impurity content of less than 1.0% and an aluminum purity of 99.0% or more as the core material, an improvement in fatigue life, particularly low cycle fatigue life, can be effectively achieved.

  That is, the above-mentioned core material made of pure aluminum has less formation of intermetallic compounds due to the low concentration of component elements compared to 3003, which is a general core material alloy, and progress of fatigue cracks generated around the intermetallic compounds. Therefore, excellent fatigue characteristics, particularly excellent low cycle fatigue characteristics can be obtained. When there are many intermetallic compounds, strain accumulates around the intermetallic compounds and leads to cracks. Furthermore, by suppressing the content of Cu, Mn, and Mg as impurities, the solid solution amount of Cu, Mn, and Mg decreases, so that the ductility of the matrix increases and strain around the intermetallic compound can be further relaxed. More excellent fatigue characteristics can be obtained.

In order to obtain excellent low cycle fatigue properties, it is desirable that among the intermetallic compounds in the matrix, the total number of intermetallic compounds having a particle diameter of 1 μm or more is 3 × 10 ⁴ or less per 1 mm ² . More desirably, 3 × 10 ³ or less, further desirably 3 × 10 ² or less, and most desirably 3 × 10 or less.

  If the aluminum purity is less than 99.0%, the above effects are not sufficient, and the fatigue life, particularly the low cycle fatigue life, is reduced. More preferable aluminum purity for achieving the above effect is 99.9% or more (inevitable impurity content: less than 0.1%), and more preferable aluminum purity is 99.99% or more (inevitable impurity content). : Less than 0.01%), and the most preferred aluminum purity is 99.999% or more (inevitable impurity content: less than 0.001%).

  Further, in pure aluminum, the remaining components excluding aluminum are unavoidable impurities, and various elements are unavoidably present depending on the refining method. Thus, the total amount is preferably adjusted to be less than 1.0%, more preferably less than 0.1%, still more preferably less than 0.01%, and most preferably less than 0.001%.

  The above inevitable impurities usually contain Fe, Si, Mn, Zn, V, Zr, Ga and the like in a proportion of about 500 ppm or less in pure aluminum having an aluminum purity of 99.0%. In pure aluminum with an aluminum purity of 99.9%, Fe, Si, V, Zr, Ga, etc. are contained at a rate of about 10 ppm or less, and Mn, Zn, etc. are contained at a rate of about several ppm or less Has been.

  In addition, in pure aluminum with an aluminum purity of 99.99%, Fe, Si, Cu, etc. are contained at a ratio of several ppm or less, and in pure aluminum with an aluminum purity of 99.999%, Si, Fe Cu, Mn, Mg, Cr, Zn, etc. are contained at a ratio of about 1 ppm or less.

  The pure aluminum can be obtained according to various known refining techniques. For example, pure aluminum having an aluminum purity of 99.9% can be obtained by using an aluminum ingot obtained by a normal electrolytic refining method and increasing its purity by a fractional crystallization method (Pecine method). Also, pure aluminum having an aluminum purity of 99.99% can be obtained by increasing the purity by a three-layer electrolysis method using an aluminum ingot obtained by an ordinary electrolytic refining method. 999% pure aluminum can be obtained by using the high-purity metal obtained by the above three-layer electrolysis method and increasing its purity using a unidirectional solidification method or a zone melting method.

  Ti functions to refine the crystal grain size of the core material and further improve the low cycle fatigue life. The preferable content range of Ti is less than 0.3% for pure aluminum having an aluminum purity of 99.0%, less than 0.05% for pure aluminum having an aluminum purity of 99.9%, and having an aluminum purity of 99.99%. In the case of pure aluminum, it is less than 0.005%, and in the case of pure aluminum having an aluminum purity of 99.999%, it is less than 0.0005%.

(Skin material 1)
Zn, In, and Sn lower the potential of the skin material and maintain the sacrificial anode effect on the core material. As a result, pitting corrosion of the core material is prevented. The preferable range of Zn is 0.5 to 10.0%, the more preferable range is 1 to 5%, the preferable range of In is 0.001 to 0.1%, the more preferable range is 0.01 to 0.05%, A preferable range of Sn is 0.001 to 0.1%, and a more preferable range is 0.01 to 0.05%.

  Mn produces | generates an Al-Mn type compound, an Al-Mn type compound becomes a starting point of corrosion, and corrosion resistance improves because a pitting corrosion is disperse | distributed. A preferable content range of Mn is 0.1 to 2.0%, and if it contains more than 2.0%, a coarse compound is generated at the time of casting, rolling workability is impaired, and it is difficult to obtain a sound plate material. . The more preferable content of Mn is in the range of 0.5 to 1.7%.

  Fe produces an Al—Fe-based compound, and the Al—Fe-based compound serves as a starting point for corrosion, and the pitting corrosion is dispersed to improve the corrosion resistance. The preferable content range of Fe is 0.1 to 2.0%, and if it exceeds 2.0%, the corrosion resistance is lowered. The more preferable content of Fe is in the range of 0.2 to 1.0%.

  Si produces | generates an Al-Si type compound, an Al-Si type compound becomes a starting point of corrosion, and corrosion resistance improves because a pitting corrosion is disperse | distributed. The preferable content range of Si is 0.1 to 2.0%, and if it exceeds 2.0%, the corrosion resistance is lowered. The more preferable content of Si is in the range of 0.2 to 1.0%.

  Ni produces | generates an Al-Ni type compound, an Al-Ni type compound becomes a starting point of corrosion, and corrosion resistance improves because a pitting corrosion is disperse | distributed. The preferable content range of Ni is 0.1 to 2.0%, and if it exceeds 2.0%, the corrosion resistance is lowered. A more preferable content of Ni is in the range of 0.2 to 1.0%.

  Cr and Zr suppress erosion during brazing heating by increasing the recrystallization temperature during brazing heating and increasing the crystal grain size of the skin material 1. The preferable content ranges of Cr and Zr are both 0.01 to 0.3%, and even if the content exceeds 0.3%, the effect is saturated and no further improvement effect can be expected. A more preferable content of Cr and Zr is in the range of 0.05 to 0.2%.

  Ti is divided into a high concentration region and a low region in the plate thickness direction of the skin material 1, and these are distributed alternately in a layered manner, and the low Ti concentration region corrodes preferentially compared to the high region, thereby corroding. It has the effect of layering the form, preventing the progress of corrosion in the plate thickness direction and improving the pitting corrosion resistance of the material. The preferable content range of Ti is 0.35% or less, and if it exceeds 0.35%, casting becomes difficult, and workability deteriorates, making it difficult to produce a sound material. A more preferable content of Ti is in the range of 0.1 to 0.2%.

  The skin material 1 includes elements added to known sacrificial anode materials, for example, Cu: 0.2% or less, Mg: 3.0% or less, V: 0.3% or less, Co: 0.3 %: Ce: 0.3% or less, Y: 0.3% or less, La: 1.0% or less, Nd: 1.0% or less, Pr: 1.0% or less.

(Skin material 2)
In the aluminum clad material of the present invention, a brazing material or a sacrificial anode material can be clad as the skin material 2 on the core material surface opposite to the skin material 1 to form a three-layer structure.

  When the brazing material is clad, the skin material 2 is made of an Al—Si based alloy or an Al—Si—Mg based alloy usually used as a brazing material. The Si content range is 2.5 to 14%, and the Mg content range is 0.1 to 2.0%.

  For Al-Si based alloys and Al-Si-Mg based alloys, Fe: 0.1-2.0%, Mn: 0.1-2.0%, Ti: 0.01-0, as necessary. .3%, Zn: 0.5-5.0%, Cu: 0.1-5.0%, Sr: 0.001-0.1%, Na: 0.001-0.1%, Sb: One or more of 0.001 to 0.1%, Bi: 0.001 to 0.2%, and Be: 0.001 to 0.1% or less may be contained. In addition, for the skin material 2, elements added to a known brazing material, for example, V: 0.3% or less, Co: 0.3% or less, Ce: 0.3% or less, Y: 0.3% Hereinafter, La: 1.0% or less, Nd: 1.0% or less, Pr: 1.0% or less, Cr: 0.3% or less, Zr: 0.3% or less may be included.

  When a sacrificial anode material is used as the skin material 2, the aluminum alloy disclosed in the skin material 1 is clad as the skin material 2 to form a three-layer structure. In this case, the skin material 1 and the skin material 2 may have the same composition, and the skin material 1 and the skin material 2 may have different compositions.

  The aluminum clad material according to the present invention ingots the core material alloy, the skin material 1 alloy, and the skin material 2 alloy by DC casting. For example, in the obtained ingot, the core material alloy is homogenized. The alloy for skin material 1 and the alloy for skin material 2 are hot-rolled to a predetermined thickness, and these and the ingot of the core material alloy are combined and hot-rolled to obtain a clad material. Thereafter, the clad material is cold-rolled and finally annealed to obtain an aluminum clad material (for example, grade O) having a predetermined thickness. Intermediate annealing may be performed in the middle of the process, or cold rolling may be further performed after final annealing to obtain H1n according to quality.

In the aluminum clad material of the present invention, the intermetallic compounds having a particle diameter of 1 μm or more among the intermetallic compounds in the matrix of the core material per 1 mm ^{2 in} the case of the two-layer structure or the three-layer structure. When the number is 3 × 10 ⁴ or less, more excellent low cycle fatigue characteristics can be obtained, and such an intermetallic compound distribution form is used as the core material for the pure aluminum or the trace amount of the inevitable impurities. This can be achieved by using aluminum containing Ti.

  Examples of the present invention will be described below in comparison with comparative examples to demonstrate the effects. These examples show one embodiment of the present invention, and the present invention is not limited thereto.

Example 1
The ingot for the core material having the composition shown in Table 1 by continuous casting, the aluminum alloy for skin material 1 having the composition shown in Table 2, and the aluminum alloy for skin material 2 shown in Table 3 were obtained. Among them, homogenization treatment is performed on the aluminum for the core material, the aluminum alloy for the skin material 1 and the aluminum alloy for the skin material 2 are hot-rolled to a predetermined thickness, and these are combined with the ingot of the aluminum for the core material and hot. It rolled and obtained the clad material of 2 layers and 3 layers. In addition, in the aluminum for core material shown in Table 1, the inevitable impurities other than the elements shown in Table 1 are 500 ppm or less for A1 and A5, 10 ppm or less for A2 and A6, and 5 ppm or less for A3 and A7. , A4 and A8 were all 1 ppm or less.

  Subsequently, the clad material was cold-rolled and finally annealed to obtain a clad plate material (quality O) having a thickness of 0.40 mm. The clad structure was such that the clad rate of the skin material 1 was 10% (thickness 0.040 mm), the clad rate of the skin material 2 was 10% (thickness 0.040 mm), and the remainder was the core material. Note that the plate thickness and the clad rate are not limited to those in the examples, and are appropriately adjusted and used. For example, the plate thickness can be about 0.10 mm to 2.00 mm, and the cladding rate can be about 2 to 20%.

The obtained aluminum clad material was used as a test material, and the clad material was heated in nitrogen gas at 600 ° C. (material temperature) for 3 minutes without applying a flux, and then the fatigue life was measured by a plane bending fatigue test. In the plane bending fatigue test, after cutting the clad material after brazing and heating, the end surface is cut to produce a strip-shaped test piece having a width of 5 mm, and for the test piece, using a bending fatigue tester shown in FIG. The strain range was fixed at 0.67, and a double-bending bending fatigue test was performed. The frequency was 0.5 Hz at room temperature, and the number of cycles until breakage was measured. Fatigue life was evaluated in a low cycle range of about 10 ⁴ break times, it was a case where fatigue life exceeds 1 × 10 ⁴ good (〇). The results are shown in Table 4.

Further, the number of particles per mm ² of intermetallic compound particles having a particle diameter (equivalent circle diameter) in the core material of the test material of 1 μm or more was measured. The method for measuring the number of intermetallic compound particles having a particle diameter of 1 μm or more in the core material is as follows. The core material was photographed with an optical microscope at five magnifications at a magnification of 200 (total area 0.15 mm ² ), and the number of particles of an intermetallic compound having a particle diameter of 1 μm or more was measured with an image analyzer. The results are shown in Table 4.

As shown in Table 4, all of the test materials 1 to 54 according to the present invention had excellent fatigue characteristics in which the fatigue life exceeded 1 × 10 ⁴ .

Comparative Example 1
The core material aluminum having the composition shown in Table 5 was ingot by continuous casting, and the resulting ingot was homogenized, and the aluminum alloy for skin material 1 and the aluminum alloy for skin material 2 used in Example 1 were used. A hot rolled material was combined and hot rolled to obtain an aluminum clad material.

  Subsequently, the clad material was cold-rolled and finally annealed to obtain a clad plate material (quality O) having a thickness of 0.40 mm. The cladding is composed of a cladding material 1 having a cladding ratio of 10% (thickness 0.040 mm), a cladding material 2 having a cladding ratio of 10% (thickness 0.040 mm), and the remainder being a core material, and an aluminum cladding material obtained. As a test material, the fatigue life and the number of intermetallic compound particles were measured by the same method as in Example 1. The results are shown in Table 6.

  As shown in Table 6, the test material 101 has a large amount of impurities because of the low aluminum purity of the core material. Therefore, when repeated stress is applied, strain accumulates around the intermetallic compound, leading to cracks, fatigue. Life was inferior.

Claims (17)

An aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity of 99.0% (mass%, the same applies hereinafter) or more The heat exchange is characterized in that the content of inevitable impurities is less than 1.0%, and the content of Cu, Mn, and Mg among the inevitable impurities is 0.05% or less of pure aluminum. Aluminum clad material for dexterity. A two-layer clad material made of aluminum clad with a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity of 99.9% or more and an inevitable impurity content Is an aluminum clad material for heat exchangers, characterized in that the content of Cu, Mn, and Mg among inevitable impurities is pure aluminum with 0.005% or less. An aluminum two-layer clad material obtained by clad the skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity of 99.99% or more and an inevitable impurity content Is an aluminum clad material for a heat exchanger, wherein the content of Cu, Mn, and Mg among unavoidable impurities is 0.0005% or less. An aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material having an aluminum purity of 99.999% or more and an inevitable impurity content Is an aluminum clad material for heat exchangers, wherein the content of Cu, Mn, and Mg among inevitable impurities is made of pure aluminum of 0.00005% or less. It is an aluminum two-layer clad material obtained by clad the skin material 1 having a sacrificial anode effect on the core material on one side of the core material, and the core material is Ti: less than 0.3% (not including 0%, The same applies hereinafter), the aluminum purity is 99.0% or more, the content of inevitable impurities is less than 0.7%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all 0.05. % Aluminum clad material for heat exchangers, characterized in that it is made of aluminum at most. A two-layer clad material made of aluminum clad with a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material containing Ti: less than 0.05% and an aluminum purity of 99 .9% by mass or more, the content of inevitable impurities is less than 0.05%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all 0.005% or less of aluminum. Aluminum clad material for heat exchanger. An aluminum two-layer clad material obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material containing Ti: less than 0.005%, and an aluminum purity of 99 99% by mass or more, the content of inevitable impurities is less than 0.005%, and the contents of Cu, Mn, and Mg among the inevitable impurities are all 0.0005% or less of aluminum. Aluminum clad material for heat exchanger. A two-layer clad material of an aluminum alloy obtained by clad a skin material 1 having a sacrificial anode effect on the core material on one side of the core material, the core material containing Ti: less than 0.0005%, and aluminum purity 99.999% by mass or more, the content of inevitable impurities is less than 0.0005%, and the content of Cu, Mn, Mg among the inevitable impurities is 0.00005% or less of pure aluminum. Aluminum clad material for heat exchangers. The skin material 1 contains one or more of Zn: 0.5 to 10%, In: 0.001 to 0.1%, Sn: 0.001 to 0.1% or less, The aluminum clad material for a heat exchanger according to any one of claims 1 to 8, wherein the aluminum clad material is composed of an aluminum alloy composed of the balance Al and inevitable impurities. The skin material 1 further includes Mn: 0.1 to 1.8%, Fe: 0.1 to 2.0%, Si: 0.1 to 2.0%, Ni: 0.1 to 2.0. %, Cr: 0.01 to 0.3%, Zr: 0.01 to 0.3%, and Ti: 0.01 to 0.35% or less. The aluminum clad material for a heat exchanger according to claim 9. A skin material made of an Al-Si alloy brazing material or an Al-Si-Mg alloy brazing material on the core material surface opposite to the skin material 1 of the aluminum clad material for heat exchanger according to any one of claims 1 to 10. An aluminum clad material for heat exchangers characterized in that 2 is clad to form a three-layer clad material. 12. The aluminum clad material for a heat exchanger according to claim 11, wherein the skin material 2 is composed of an aluminum alloy brazing material containing Si: 2.5 to 14% and the balance being Al and inevitable impurities. . The skin material 2 is further Mg: 0.1-2.0%, Fe: 0.1-2.0%, Mn: 0.1-2.0%, Ti: 0.01-0.3% Zn: 0.5-5.0%, Cu: 0.1-5.0%, Sr: 0.001-0.1%, Na: 0.001-0.1%, Sb: 0.001 It contains 1 type or 2 or more types of -0.1%, Bi: 0.001-0.2%, Be: 0.001-0.1% or less of Claim 12 characterized by the above-mentioned. Aluminum clad material for heat exchanger. A clad material 2 made of an aluminum alloy having a sacrificial anode effect is clad on the core material surface opposite to the skin material 1 of the aluminum clad material for heat exchanger according to any one of claims 1 to 10, and a three-layer clad material An aluminum clad material for a heat exchanger characterized by the above. The skin material 2 contains one or more of Zn: 0.5 to 10%, In: 0.001 to 0.1%, Sn: 0.001 to 0.1% or less, The aluminum clad material for a heat exchanger according to claim 14, wherein the aluminum clad material is composed of an aluminum alloy composed of the balance Al and inevitable impurities. The skin material 2 further includes Mn: 0.1 to 1.8%, Fe: 0.1 to 2.0%, Si: 0.1 to 2.0%, Ni: 0.1 to 2.0. %, Cr: 0.01 to 0.3%, Zr: 0.01 to 0.3% or less, and Ti: 0.01 to 0.35% or less. The aluminum clad material for a heat exchanger according to claim 15, wherein the aluminum clad material is a heat exchanger. Among the intermetallic compounds in the matrix of the core material, there are 3 × 10 ⁴ or less intermetallic compounds having a particle size (equivalent circle diameter, the same shall apply hereinafter) of 1 μm or more per 1 mm ^2. The aluminum clad material for heat exchangers according to any one of claims 1 to 16.

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