JP5647818B2 - Aluminum alloy brazing fin material for heat exchanger and heat exchanger using the fin material - Google Patents

Description

  The present invention relates to an aluminum alloy brazing fin material brazed to a tube material for a heat exchanger and a heat exchanger using the fin material.

Aluminum alloy heat exchangers are used as heat exchangers for automobile radiators, heater cores, oil coolers, intercoolers, car air conditioner evaporators, condensers, etc., or as heat exchangers for room air conditioners for general home use and commercial use. As widely used.
Such a heat exchanger has, for example, a flat tube material for a refrigerant passage made of an Al alloy, and a fin material brazed to the tube material, and refrigerant and outside air flowing through the tube material passage. The heat exchange is performed through the fin material. Here, in order to simplify the brazing operation with the tube material as the fin material, brazing fin materials in which the brazing material is bonded to both surfaces of the plate-like core material are used (for example, , See Patent Document 1).

JP 2004-84060 A

  In such a brazing fin material, in particular, a brazing fin material in which an Al—Si alloy brazing material is bonded to both surfaces of the core material is more plate-like than a bare fin material (fin material to which no brazing material is bonded). Wear of the cutting blade tends to progress during louver cutting in slit cutting processing and fin forming for making the raw material coil into a predetermined fin material width. When the cutting blade is worn, the burr on the cut surface of the fin material tends to increase, and if a fin material with a large burr is used for a heat exchanger, this burr becomes a ventilation resistance and the heat exchange efficiency is reduced. is there. For this reason, in the cutting process of the brazing fin material, it is necessary to replace the cutting blade with a new one along with the occurrence of burrs on the cut surface of the fin material, leading to a decrease in productivity. Therefore, there has been a demand for a brazing fin material that suppresses the progress of wear of the cutting blade during the cutting process and that does not generate large burrs on the cut surface.

  The present invention has been made in view of such circumstances, and in various cutting processes, aluminum for heat exchangers that suppresses the progress of wear of the cutting blade and hardly generates large burrs that lead to a decrease in heat exchange efficiency. An object is to provide an alloy brazing fin material and a heat exchanger using the fin material.

In order to solve the above-mentioned problems, the present inventors have studied a mechanism of generation of wear of a cutting blade during material cutting as shown below.
First, the inventors of the present invention are that the cutting blade wears during the cutting process of the fin material, and the main factor that the burr on the cut surface of the fin material becomes large is the Al—Si alloy brazing material bonded to the surface of the brazing fin. Further, the present inventors have found that this is caused by a large amount of Si particles and intermetallic compounds that are relatively coarse and have high hardness. When a large amount of coarse and high hardness Si particles and intermetallic compounds are contained in the brazing material, the load on the cutting blade increases during material cutting, and wear progresses earlier. Therefore, the present inventors have studied to refine the Si particles and the intermetallic compound of the Al—Si alloy brazing material. As a result, wear of the cutting blade during material cutting is suppressed, and burrs of the fin material are generated. It was found that it can be suppressed. Similarly, regarding the core material of the brazing fin material, it has been found that making the Si particles and the intermetallic compound in the core material fine is effective for suppressing wear of the cutting blade and suppressing generation of burrs.

  Further, the present inventors also have an influence on the wear of the cutting blade due to the hardness of the matrix of the material (brazing material, core material). We thought that the wear of the blade was likely to progress and that large burrs would be likely to occur early. Then, when examination which reduces the hardness of a raw material (brazing | wax material, core material) in the range in which fin formation is possible was performed, it discovered that it was effective in the abrasion suppression of a cutting blade, and suppression of a burr | flash generation | occurrence | production.

As a result of intensive studies as described above, the present inventors have completed the present invention.
That is, the present invention has a core material and a brazing material bonded to both surfaces of the core material, and is brazed in a state where it is assembled to a tube material for a heat exchanger. An aluminum alloy brazing fin material for a heat exchanger joined to a tube material, wherein the brazing material contains Si: 6.8 to 11.0% by mass, Fe: 0.20% by mass or less, and the balance is Al. And the number density of Si particles having a maximum chord length of 5 μm or more and an Al—Fe-based intermetallic compound is less than 1 × 10 ³ pieces / mm ² , and Vickers hardness is 45 or less, and the core material is Mn: 1.0 to 1.8% by mass, Zn: 0.10 to 3.0% by mass, Fe: 0.20% by mass or less, Si: 0 .Containing 60% by mass or less The number of the Si particles, the Al- (Mn, Fe) -Si intermetallic compound, and the Al-Mn-Si intermetallic compound, the balance of which is composed of an aluminum alloy composed of Al and inevitable impurities, and the maximum chord length is 5 μm or more. An aluminum alloy brazing fin material for a heat exchanger , wherein the density is less than 5 × 10 ² pieces / mm ² and the core material has a Vickers hardness of 40 to 60 .

In the present invention, the brazing material is one of Sr: 0.01 to 0.05% by mass, Na: 0.01 to 0.10% by mass, Sb: 0.01 to 0.10% by mass, or It may be an aluminum alloy brazing fin material for heat exchangers containing two or more kinds.
In the present invention, the core material is one of Zr: 0.05 to 0.30 mass%, Cr: 0.05 to 0.30 mass%, Ti: 0.05 to 0.30 mass%, or It may be an aluminum alloy brazing fin material for heat exchangers containing two or more kinds.
The heat exchanger of the present invention is characterized by including the aluminum alloy brazing fin material for heat exchanger described above.

The aluminum alloy brazing fin material for a heat exchanger according to the present invention includes a brazing material containing Si and Fe in a predetermined content, and a maximum chord length in the brazing material of 5 μm or more between the Si particles and the Al—Fe-based metal. The number density and Vickers hardness of the compound are defined, and the core material contains Mn, Zn, Fe, and Si at a predetermined content, Si particles having a maximum chord length of 5 μm or more, and Al— (Mn, Fe) —Si Since the number density and Vickers hardness of Al-Mn-Si intermetallic compounds and Vickers hardness are specified , the burden on the cutting blade can be reduced during material cutting, and the wear of the cutting blade is suppressed. , The generation of burrs can be suppressed. Therefore, according to the present invention, it is possible to provide an aluminum alloy brazing fin material for a heat exchanger that is unlikely to generate a large burr that leads to a decrease in heat exchange efficiency.

In addition, the aluminum alloy brazing fin material for heat exchanger according to the present invention contains a predetermined amount of Si and Fe in the brazing material, so that it has good bondability to the tube material while suppressing brazing erosion to the core material. Can be brazed.

  Since the heat exchanger according to the present invention includes the aluminum alloy brazing fin material for a heat exchanger as described above, the fin material and the tube material can be reliably joined, and heat exchange between the refrigerant and the outside air can be performed by using the fin material. It is made efficient through. In addition, since the fin material itself is unlikely to generate large burrs during the material cutting process, there is no ventilation resistance due to the burrs, and the heat exchanger has high heat exchange efficiency.

It is a schematic longitudinal cross-sectional view which shows the aluminum alloy brazing fin material for heat exchangers which concerns on this invention. It is a schematic perspective view which shows an example of the heat exchanger provided with the aluminum alloy brazing fin material for heat exchangers which concerns on this invention.

Hereinafter, specific embodiments of the present invention will be described.
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of an aluminum alloy brazing fin material (hereinafter simply referred to as “fin material”) for a heat exchanger according to the present invention.
A fin material 1 shown in FIG. 1 has a core material 2 and a brazing material 3 clad-bonded (bonded) to both the front and back surfaces of the core material 2, and a tube material (refrigerant) for a heat exchanger. By being brazed in a state of being assembled to the passage material), it is brazed and joined to the tube material (refrigerant passage material) via the brazing material. The shape of the fin material 1 is not particularly limited, and can be appropriately selected according to the form of the heat exchanger to which the fin material 1 is applied, such as a flat plate shape, a corrugated plate shape, and a bellows shape.

The brazing material 3 is used when brazing the fin material 1 and the tube material. The brazing material 3 is melted by being brazed by heating in a state where the fin material 1 is assembled to the tube material, and the fin material 1 and the tube material. And brazed.
In the present invention, the brazing material 3 contains 6.8 to 11.0% by mass of Si, the content of Fe is 0.20% by mass or less, and the balance is made of an aluminum alloy composed of Al and inevitable impurities. It is configured. In addition, the brazing material 3 has a number density of Si particles having a maximum chord length of 5 μm or more and an intermetallic compound of less than 1 × 10 ³ pieces / mm ² and a Vickers hardness of 45 or less. Here, the maximum chord length in the present specification and claims means the length of a straight line connecting two points that are the most spaced apart on the surface of the particle. Moreover, the intermetallic compound in the brazing filler metal 3 mainly means an Al—Fe-based intermetallic compound.

Hereinafter, the reason why the content of these elements, the number density of Si particles having a maximum chord length of 5 μm or more and intermetallic compounds, and the Vickers hardness are specified will be described in detail.
First, Si functions to lower the melting point of the brazing material 3 and increase the flowability of the molten brazing material.
When the Si content is less than 6.8% by mass, the absolute amount of the molten braze is reduced during the brazing treatment, and thus the bonding property between the fin material 1 and the tube material tends to be lowered. On the other hand, if the Si content exceeds 11.0% by mass, the absolute amount of the molten braze will be excessive during the brazing treatment, and the brazing erosion of the core material 2 will easily occur.
When the Fe content exceeds 0.20 mass%, coarse Fe-based intermetallic compounds in the brazing filler metal 3 increase, and the load on the cutting blade increases during material cutting. Wear and increased burr height are likely to occur.

Here, in the brazing material 3 of the present embodiment, the number density of the Si particles having a maximum chord length of 5 μm or more and the intermetallic compound is less than 1 × 10 ³ pieces / mm ² . If the number density of Si particles and intermetallic compounds with a maximum chord length of 5 μm or more in the brazing material 3 exceeds 1 × 10 ³ pieces / mm ² , the load on the cutting blade increases when cutting the material, and early cutting is performed. Blade wear and burr height increases. The number density of Si particles having a maximum chord length of 5 μm or more and an intermetallic compound of less than 1 × 10 ³ pieces / mm ² means that the Si particles having a maximum chord length of 5 μm or more and an intermetallic compound having a maximum chord length of 5 μm or more. The total number density is less than 1 × 10 ³ pieces / mm ² .
The brazing material 3 has a Vickers hardness of 45 or less. When the Vickers hardness of the brazing material 3 exceeds 45, wear of the cutting blade tends to proceed during material cutting, and the burr height tends to increase early.

In addition to these additive elements, the brazing filler metal 3 includes Sr: 0.01 to 0.05% by mass, Na: 0.01 to 0.10% by mass, and Sb: 0.01 to 0.10% by mass. 1 type (s) or 2 or more types can be included.
These elements have the effect of refining the Si particles in the brazing material 3. If the content of these elements is out of the above range, it is difficult to obtain the effect of Si particle refinement, and the burr suppression effect cannot be obtained.

Next, the core material 2 will be described. The core material 2 functions as a heat transfer surface for exchanging heat between the refrigerant flowing inside the tube material and the outside air in a state where the fin material 1 is incorporated in the heat exchanger, and the sacrificial anode effect of the tube material 2 It functions to prevent corrosion.
In the present embodiment, the core material 2 contains 1.0 to 1.8% by mass of Mn, 0.10 to 3.0% by mass of Zn, Fe content of 0.20% by mass or less, Si It is preferable that the content is 0.60% by mass or less, and the balance is made of an aluminum alloy composed of Al and inevitable impurities. The core material 2 may have a number density of Si particles having a maximum chord length of 5 μm or more and an intermetallic compound of less than 5 × 10 ² pieces / mm ² and a Vickers hardness of 40 to 60. preferable. Here, the intermetallic compound in the core material 2 mainly means an Al- (Mn, Fe) -Si intermetallic compound and an Al- (Mn, Fe) intermetallic compound.

Hereinafter, the reasons for defining these will be described in detail.
First, Mn is used to improve the strength of the fin material 1. When the content of Mn is less than 1.0% by mass, the effect of improving the strength by adding Mn cannot be obtained sufficiently, and the height and pitch of the fin material 1 are not stable during the molding of the fin material 1, and the brazing treatment is performed. The bondability between the fin material 1 and the tube material tends to decrease. If the Mn content exceeds 1.8 mass%, the amount of coarse intermetallic compounds in the core material 2 increases, and the manufacturability (rollability, etc.) of the core material 2 is impaired.

Zn improves the sacrificial anode effect on the tube material of the fin material 1 by making the potential of the core material 2 base.
If the Zn content is less than 0.10% by mass, the effect cannot be sufficiently obtained. Moreover, when content of Zn exceeds 3.0 mass%, the self-corrosion resistance of the fin material 1 will fall.
Fe has an effect of increasing the strength of the core material 2, but when the Fe content exceeds 0.20 mass%, coarse Fe-based intermetallic compounds in the core material 2 increase, and the material is cut when the material is cut. The load on the blade is increased, and the wear of the cutting blade and the increase in the burr height are likely to occur at an early stage.
Si is used to improve the strength of the fin material 1. Si forms a fine Al—Mn—Si compound with Mn and contributes to strength improvement. When the Si content exceeds 0.60% by mass, coarse Si-based intermetallic compounds in the core material 2 increase, and the load on the cutting blade increases when cutting the material. Increase in burr height is likely to occur.

Here, in the core material 2 of the present embodiment, it is preferable that the number density of the Si particles having the maximum chord length of 5 μm or more and the intermetallic compound is less than 5 × 10 ² pieces / mm ² . If the number density of Si particles having a maximum chord length of 5 μm or more in the core material 2 and the number density of intermetallic compounds exceeds 5 × 10 ² pieces / mm ² , the load on the cutting blade increases when cutting the material, and early cutting is performed. Blade wear and burr height increases. The number density of Si particles having a maximum chord length of 5 μm or more and the number density of intermetallic compounds is less than 5 × 10 ² pieces / mm ² means that Si particles having a maximum chord length of 5 μm or more and intermetallic compounds having a maximum chord length of 5 μm or more. The total number density is less than 5 × 10 ² pieces / mm ² .
The Vickers hardness of the core material 2 is 40-60. When the Vickers hardness of the core material 2 is less than 40, the height and pitch of the fin material 1 are not stable when the fin material 1 is molded, and the bondability between the fin material 1 and the tube material tends to decrease during the brazing process. Further, if the Vickers hardness of the core material 2 exceeds 60, the cutting blade is likely to be worn during material cutting, and the burr height tends to increase early.

In addition to the above elements, the core material 2 is composed of Zr: 0.05 to 0.30 mass%, Cr: 0.05 to 0.30 mass%, Ti: 0.05 to 0.30 mass%. Of these, one or more can be included.
These elements have the effect of increasing the strength of the core material 2. When the content of these elements is smaller than the above range, the contribution to strength improvement is small. On the other hand, when the content of these elements exceeds the above range, the number density of coarse intermetallic compounds in the core material 2 increases, and the burr suppressing effect cannot be obtained.

  As described above, in the aluminum alloy brazing fin material 1 for a heat exchanger according to the present embodiment, the brazing material 3 contains Si and Fe at a predetermined content, and the maximum chord length in the brazing material 3 is 5 μm or more. In addition, since the number density and Vickers hardness of the intermetallic compound are prescribed, the burden on the cutting blade can be reduced at the time of cutting the material, the wear of the cutting blade can be suppressed, and the occurrence of burrs can be suppressed. . Therefore, according to the present invention, it is possible to provide an aluminum alloy brazing fin material for a heat exchanger that is unlikely to generate a large burr that leads to a decrease in heat exchange efficiency.

Moreover, the aluminum alloy brazing fin material 1 for a heat exchanger according to the present embodiment includes Mn, Zn, Fe, and Si in a predetermined content in the core material 2 and a maximum chord length in the core material 2 of 5 μm or more. By prescribing the number density and Vickers hardness of Si particles and intermetallic compounds, the burden on the cutting blade can be reduced when cutting materials, reducing the wear of the cutting blade and improving the burr generation suppression effect. Can be made.
Furthermore, the aluminum alloy brazing fin material 1 for a heat exchanger according to the present embodiment contains a predetermined amount of Si and Fe in the brazing material 3. Can be brazed with good bonding properties.

Next, an embodiment of a heat exchanger provided with the fin material according to the present invention will be described.
FIG. 2 is a schematic perspective view showing an embodiment of a heat exchanger to which the fin material according to the present invention is applied. The heat exchanger 10 shown in FIG. 2 includes a pair of header pipes 11 arranged on the left and right sides, a plurality of tubes 12 installed between the header pipes 11 at intervals in parallel, and adjacent tubes. It is comprised with the fin material 1 arrange | positioned between 12.

Each tube 12 consists of a flat multi-hole pipe, and the internal space (refrigerant passage) of the tube 12 and the header pipe 11 is connected, and a refrigerant | coolant is circulated. In addition, each fin member 1 has a bellows shape, and each bent portion is fixed to the upper surface or the lower surface of each tube 12 by brazing.
In the heat exchanger 10 configured as described above, the internal space (refrigerant passage) of each header pipe 11 and each tube 12 circulates the refrigerant, so that heat exchange between the refrigerant and the outside air is performed via the fin material 1. It is like that.

  And in the heat exchanger 10 of this form, especially each fin material 1 is comprised by the fin material 1 of this embodiment. For this reason, the fin material 1 and the tube material 12 are reliably joined, and the heat exchange between the refrigerant and the outside air is efficiently performed via the fin material 1. Further, since the fin material 1 of the present embodiment hardly generates large burrs during the material cutting process, the heat exchanger 10 having no heat resistance due to burrs and high heat exchange efficiency can be obtained. In particular, in the heat exchanger 10 having a structure in which the fin material 1 is thin and downsized, and the gap between the fin materials 1 is several mm, it is effective that there is no small burr.

  As mentioned above, although each embodiment of the aluminum alloy brazing fin material for heat exchangers and the heat exchanger using the fin material according to the present invention has been described, the above-described aluminum alloy brazing fin material 1 for heat exchanger and the heat exchanger 10 are described. Each part which comprises is an example, Comprising: It can change suitably in the range which does not deviate from the scope of the present invention.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

"Production of fin material"
(Sample Nos. 1 to 13)
An aluminum alloy ingot was obtained from a molten aluminum alloy for a core material containing the elements shown in Table 1 described later, and homogenized at 450 ° C. for 6 hours to obtain a core material.
Moreover, the aluminum alloy ingot obtained from the aluminum alloy molten metal for brazing filler metal containing each element in the content shown in Table 1 is subjected to a homogenization treatment at 450 ° C. for 6 hours, and then hot rolling. A brazing material was obtained. In addition, generally used conditions were used as the hot rolling conditions.

Next, brazing fins having a thickness of 0.07 mm and a brazing material single-sided cladding ratio of 10% are sequentially subjected to hot rolling, cold rolling, and intermediate annealing for clad pressure bonding of the brazing material on both sides of the core material. The material was obtained. In addition, the intermediate annealing was performed at 400 ° C. for 3 hours, and the final rolling rate was 30%. Moreover, the conditions generally used are used for the conditions of hot rolling and cold rolling.
Sample No. No. 13 was the same as that of No. 1 except that the Vickers hardness of the brazing material and the core material was adjusted by changing the final rolling ratio. A brazing fin material was obtained in the same manner as the sample 1.

(Comparative Examples 1-3)
This is an example in which the content of the additive element of the brazing material is manufactured so as to deviate from the range defined in the present invention, except that the composition of the brazing material is as shown in Table 1 above. A brazing fin material was obtained in the same manner as the sample No. 1.

(Comparative Example 4)
Except that the Vickers hardness of the brazing material and the core material is deviated from the range defined in the present invention by changing the final rolling rate, the above No. 1 is obtained. A brazing fin material was obtained in the same manner as the sample 1.

"Evaluation"
For the fin materials produced in each Example and each Comparative Example, the Vickers hardness and the number density of Si particles having a maximum chord length of 5 μm or more and intermetallic compounds were measured, and a cutting test and brazing were performed as follows. A test was conducted. The results are shown in Tables 1 and 2.
1. Vickers hardness Based on JISZ2244, the Vickers hardness of each core material and each brazing material was measured.
2. Number density of Si particles and intermetallic compounds with a maximum chord length of 5 μm or more The Si particles and intermetallic compounds are separated by EPMA (Electron Probe Micro Analyzer) within a range of 1000 × 20 fields of view for each fin material cross section. By performing the valuation treatment, the number density of Si particles having a maximum chord length of 5 μm or more and intermetallic compounds was measured.

3. Cutting test The coil of each fin material was slit into a strip with a width of 32 mm, and the resulting strip was used to create an end shear (cutting blade material: SKD6 (hardness) of a high-speed press (manufactured by Kuroda Manufacturing Co., Ltd.). A cutting test according to HRC 50)) was carried out. The test conditions were a strip feed rate of 200 spm and a 5 mm pitch cut in the rolling direction of the specimen. Evaluation is made by measuring the burr height of the cross section of the cut piece after 50,000 shots, and the burr height is very good when it is less than 50 μm (未 満), good when it is 50 μm or more and less than 80 μm (◯), 80 μm or more The thing of was bad (x).

4). Brazing test Each fin material was subjected to corrugation processing and assembled to a tube material made of JIS3003 alloy. The assembled fin material and tube material were brazed and heated at 600 ° C. for 3 minutes in a nitrogen gas atmosphere after applying a fluoride-based flux.
Next, each fin material joined by brazing was physically removed from the tube material with a cutter blade, and the fin joint portion trace remaining on the surface of the tube material was observed. Then, the number of unjoined locations (locations where brazing was performed but no joint trace was left) was counted, and the joining rate was determined based on the following formula.
Joining rate = (number of unjoined parts / number of all joined parts) × 100 (%)
Number of all joints: Number of all parts that have been brazed Number of unjoined parts: Number of parts that have been brazed but no traces of joints remained Also observe the cross-section of each brazed material Then, the state of melt diffusion to the core material side of the brazing material was examined. If the brazing material is melted and diffused to the core material side, the fin material tends to buckle, and the pressure resistance of the heat exchanger decreases. Here, the case where melt diffusion to the core material side of the brazing material was not recognized was evaluated as ◯, and the case where it was recognized was evaluated as ×.

  As shown in Table 2, no. The fin materials of samples 1 to 13 all had small burr heights after 50,000 shots and were excellent in cutting workability. Moreover, the joining property with respect to the tube material was good, and the wax erosion of the core material after joining was suppressed.

On the other hand, the fin material of Comparative Example 1 in which the Si content of the brazing material is smaller than the predetermined range (6.8 to 11.0% by mass) has a low bonding rate to the tube material, and the Si content is larger than the predetermined range. In the fin material of Comparative Example 2, the core material was subjected to wax erosion after joining.
The Fe content of the brazing material is larger than a predetermined range (0.20% by mass or less), and the number density of Si particles and intermetallic compounds having a maximum chord length of 5 μm or more in the brazing material is within a predetermined range (1 × 10 ^2). The fin material of Comparative Example 3, which was larger than (pieces / mm ² ), had a high burr height after 50,000 shots of 81 μm and had poor cutting workability.
The fin material of Comparative Example 4 in which both the Vickers hardness of the brazing material and the core material were larger than the predetermined range had a high burr height after 50,000 shots of 85 μm, and the cutting workability was poor.

  DESCRIPTION OF SYMBOLS 1 ... Fin material (aluminum alloy brazing fin material for heat exchangers), 2 ... Core material, 3 ... Brazing material, 10 ... Heat exchanger, 11 ... Header pipe, 12 ... Tube material.

Claims (4)

Having a core material and a brazing material bonded to both sides of the core material;
An aluminum alloy brazing fin material for a heat exchanger that is joined to the tube material by the brazing material by being brazed in a state assembled to the tube material for a heat exchanger,
The brazing material contains Si: 6.8 to 11.0% by mass, Fe: 0.20% by mass or less, the balance is made of an aluminum alloy composed of Al and inevitable impurities, and the maximum chord length is 5 μm or more. The number density of the Si particles and the Al—Fe-based intermetallic compound is less than 1 × 10 ³ pieces / mm ² , and the Vickers hardness of the brazing material is 45 or less,
The core material contains Mn: 1.0 to 1.8 mass%, Zn: 0.10 to 3.0 mass%, Fe: 0.20 mass% or less, Si: 0.60 mass% or less, Number density of Si particles, Al- (Mn, Fe) -Si intermetallic compound, and Al-Mn-Si intermetallic compound composed of the balance Al and unavoidable impurities, each having a maximum chord length of 5 μm or more Is less than 5 × 10 ² pieces / mm ² , and the Vickers hardness of the core material is 40 to 60, an aluminum alloy brazing fin material for heat exchangers. The brazing material is composed of one or more of Sr: 0.01 to 0.05% by mass, Na: 0.01 to 0.10% by mass, and Sb: 0.01 to 0.10% by mass. above aluminum alloy brazing fin material according to claim 1, characterized in that it contains. The core material is composed of one or more of Zr: 0.05 to 0.30 mass%, Cr: 0.05 to 0.30 mass%, Ti: 0.05 to 0.30 mass%. It contains, The aluminum alloy brazing fin material for heat exchangers of Claim 1 or 2 characterized by the above-mentioned. A heat exchanger comprising the aluminum alloy brazing fin material for a heat exchanger according to any one of claims 1 to 3 .

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