JP2006348372A - High strength aluminum alloy material for automobile heat-exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high strength aluminum alloy material for automobile heat-exchanger having excellent productivity at a low cost without developing the exfoliation etc., of a brazing filler metal at the forming time. <P>SOLUTION: In a high strength aluminum alloy material for automobile heat-exchanger, coated with a composition 3 for brazing, which is prepared by mixing one or more kinds among Al-Si based alloy powder, Al-Si-Zn based alloy powder and Si powder, flux and binder, or coated with a flux composition 4, which is prepared by mixing the flux and the binder, on the one side surface or the both surfaces of an aluminum alloy core material 2; the above flux is the one, which is single or mixture selected among K<SB>1-3</SB>AlF<SB>4-5</SB>, ZnF<SB>2</SB>, ZnCl<SB>2</SB>, KZnF<SB>3</SB>, K<SB>2</SB>SiF<SB>6</SB>, and the composition 3 for brazing or the flux composition 4 is coated only to the necessary prescribed position after working. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-strength aluminum alloy material for automobile heat exchangers.

  In general, an automobile heat exchanger used for a radiator, a car air conditioner, or the like is formed by combining members such as a tube material, a fin material, a header plate, and a side support material.

As a tube material, a clad material in which a sacrificial material is bonded to one surface of an aluminum alloy core material and a brazing material is bonded to the other surface is used. A tube material of a type that forms a passage by the above, an extruded multi-hole tube, or the like is used. Moreover, in the case of a tube material for a car air conditioner, an inner fin may be inserted inside the tube in order to increase heat exchange efficiency.
In an evaporator, an oil cooler, or the like, there is a so-called drone cup type heat exchanger in which a clad material in which a brazing material is bonded to both surfaces of an aluminum alloy core material is pressed and overlapped.

Examples of the fin material include a bare material and a clad fin material in which a brazing material is clad on both surfaces of an aluminum alloy core material.
For the header plate, a clad material in which a brazing material is bonded to one side or both sides of an aluminum alloy core material is used.
For the side support, a clad material in which a brazing material is bonded to one side of an aluminum alloy core material is used.

  A heat exchanger is obtained by carrying out a brazing process after assembling the respective members, applying the flux, and performing a brazing process after performing molding using the above-described materials.

  Various proposals have been made for techniques for producing a heat exchanger by supplying a brazing filler metal to a member made of an aluminum alloy material and performing a brazing process, for example, those described in Patent Documents 1 and 2 .

Further, as a technique for applying a coating material such as a brazing material to a material to be processed such as an aluminum alloy material, there are those described in Patent Documents 3 and 4, for example.
JP-A-6-47529 JP-A-6-114544 JP 2000-61629 A JP 2003-285160 A

In the aluminum alloy material described in Patent Document 1, after a mixture containing a brazing material is applied to the surface of the core material, a molding process is performed, each molded member is assembled, and then a brazing process is performed. An exchange is obtained.
However, the aluminum alloy material described in Patent Document 1 is obtained by applying a mixture containing a brazing material to the entire surface of the core material, and the mixture is applied to positions other than the brazed joint portion. May be wasted and manufacturing costs may increase.
In addition, since the brazing material is also applied to positions other than the brazed joint, this method was used for members with severe molding processes such as drone cup type evaporator plate materials, header plates, side supports, etc. In this case, the coating film to which the mixture is applied peels off during the molding process, and remains in the mold and is transferred to the material, resulting in thinning of the molded product and wear of the mold, or the coating film falling into the machine Doing so may cause serious problems such as wear of parts and machine stoppage.

In the aluminum alloy material described in Patent Document 2, after molding the core material, a mixture containing the brazing material is applied to a predetermined position to be a brazed joint portion of each molded member, and then each member is assembled. A heat exchanger is obtained by performing the additional treatment.
However, the aluminum alloy material described in Patent Document 2 is a method in which the mixture containing the brazing material is partially applied after the core material is molded, and the method of application differs depending on the mold used. There are problems such as a decrease in productivity.

In the aluminum alloy material described in Patent Document 3, after the core material is molded, the brazing material is applied to a predetermined position to be a brazed joint portion of each molded member.
Moreover, in the application | coating material application method of patent document 4, a coating material is apply | coated to a film having already been processed such as an adhesive.
In both Patent Documents 3 and 4, a coating material such as a brazing material is partially applied to a material to be treated such as an aluminum alloy material after the forming process, resulting in a decrease in productivity in the coating process. There is.

  The present invention has been made in view of the above circumstances, and does not cause peeling of the brazing material at the time of molding, and is a low-cost and high-productivity high-strength aluminum alloy material for automotive heat exchangers and automotive heat using the same. The purpose is to provide an exchanger.

In view of the above, the present inventors have less waste of powder brazing filler metal, Si powder, flux, etc., solve problems such as coating film peeling at the time of molding, and further reduce the production cost. We researched aluminum alloy materials for automobile heat exchangers and automobile heat exchangers using them.
As a result, one or more of Al—Si based alloy powder, Al—Si—Zn based alloy powder or Si powder and a flux (for example, K _1-3) are formed on one or both sides of the aluminum alloy core. A brazing composition or a flux in which AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF ₃ , KZnF ₃ , K ₂ SiF ₆ alone or in combination is mixed with a binder Solved by applying the brazing composition or the flux composition in advance to a predetermined position after processing in an aluminum alloy core material coated with a flux composition in which a binder and a binder are mixed. It came to the view that it was possible.
(1) Invention of Claim 1 On one side or both sides of an aluminum alloy core material, one or more of Al—Si based alloy powder, Al—Si—Zn based alloy powder, Si powder, and flux In the high-strength aluminum alloy material for automobile heat exchangers to which a brazing composition in which a binder is mixed or a flux composition in which a flux and a binder are mixed is applied, the flux is K _{1 -3} AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ alone or in combination, and after the brazing composition or flux composition is processed A high-strength aluminum alloy material for automobile heat exchangers, characterized in that it is applied only at the necessary predetermined positions.
(2) Invention of Claim 2 Al—Si alloy brazing material or Al—Si—Zn alloy brazing material bonded to one surface of an aluminum alloy core material is bonded to one surface or both surfaces of a clad material. Alloy powder, Al-Si-Zn alloy powder, one or more of Si powder, flux and binder are mixed, or flux and binder are mixed In the high-strength aluminum alloy material for automobile heat exchangers to which the flux composition is applied, the flux is selected from the group consisting of K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ . The brazing composition or the flux composition is applied only at a predetermined position necessary after processing. Automotive heat exchangers and high strength aluminum alloy material that.
(3) The invention according to claim 3 A clad in which a sacrificial anode material is bonded to one side of an aluminum alloy core material, and an Al—Si alloy brazing material or an Al—Si—Zn alloy brazing material is bonded to the other surface. Brazing composition in which one or more of Al-Si alloy powder, Al-Si-Zn alloy powder, Si powder, flux and binder are mixed on one or both sides of the material Or a high-strength aluminum alloy material for automobile heat exchangers coated with a flux composition in which a flux and a binder are mixed, the flux is K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K is ₂ alone is selected from among the SiF ₆ or a mixture, the brazing composition, or the flux composition, a predetermined position required after processing Automotive heat exchangers and high strength aluminum alloy material, characterized in that the coating only.
(4) Invention of Claim 4 The said sacrificial anode material is the mass%, Zn: 8% or less, Mn: 0.1% or more and 3.0% or less, Si: 0.05% or more and 1.5% Fe: 0.05% to 2.5%, Cu: 0.2% or less, Zr: 0.2% or less, Ti: 0.25% or less, Mg: 0.5% Hereinafter, it contains one or more of Cr: 0.2% or less, V: 0.2% or less, is composed of other inevitable impurities, and is electrochemically less basic than the aluminum alloy core material. The high-strength aluminum alloy material for automobile heat exchangers according to (3), which is a sacrificial anode material.
(5) Invention of Claim 5 The said aluminum alloy core material is the mass%, Mn: 0.2% or more and 3.0% or less, Si: 0.2% or more and 1.5% or less, Fe: 0 0.05% to 2.5%, Cu: 0.7% or less, Zr: 0.2% or less, Zn: 8% or less, Ti: 0.25% or less, Mg: 0.5 % Or less, Cr: 0.2% or less, V: 0.2% or less, one or more of them, and other inevitable impurities, any one of (1) to (4) A high-strength aluminum alloy material for an automobile heat exchanger according to claim 1.
(6) Invention of Claim 6 The amount of application | coating of the said flux exists in the range of 3-50 g / m < ² >, The height for motor vehicle heat exchangers in any one of (1) thru | or (5) characterized by the above-mentioned. Strength aluminum alloy material.
(7) Invention of Claim 7 The total application quantity of the said Al-Si type powder alloy brazing material, Al-Si-Zn type alloy powder brazing material, and Si powder exists in the range of 1-150 g / m < ² >. The high-strength aluminum alloy material for automobile heat exchangers according to any one of (1) to (6).

The high-strength aluminum alloy material for an automobile heat exchanger according to the present invention has one or two of Al-Si alloy powder, Al-Si-Zn alloy powder, and Si powder on one or both surfaces of an aluminum alloy core material. In the high-strength aluminum alloy material for automobile heat exchangers coated with the above, a brazing composition in which a flux and a binder are mixed, or a flux composition in which a flux and a binder are mixed. Is selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ , or a mixture thereof, and the brazing composition or the flux composition Is applied only to a predetermined position required after processing.
As a result, waste of powder brazing material, Si powder, flux, etc. is reduced, and coating film peeling at the time of molding can be reduced.
Therefore, it is possible to manufacture a high-quality high-strength aluminum alloy material for automobile heat exchangers at low cost.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a high-strength aluminum alloy material for automobile heat exchanger according to the present invention will be described with reference to the drawings.
The high-strength aluminum alloy material 1 for automobile heat exchangers of the present embodiment (hereinafter sometimes abbreviated as high-strength aluminum alloy material 1) is either one surface (one surface 2a in FIG. 1) or both surfaces (FIG. 1). 1, one surface 2a and the other surface 2b) are mixed with one or more of Al-Si alloy powder, Al-Si-Zn alloy powder, and Si powder, a flux, and a binder. In a high strength aluminum alloy material for an automobile heat exchanger to which a brazing composition 3 or a flux composition 4 in which a flux and a binder are mixed is applied, the brazing composition or the flux composition is It is generally configured by applying only to a predetermined position necessary after processing.

  Further, in the high-strength aluminum alloy material 1 of the present embodiment, the aluminum alloy core material 2 is in mass%, Mn: 0.2% to 3.0%, Si: 0.2% to 1.5%. Fe: 0.05% to 2.5%, Cu: 0.7% or less, Zr: 0.2% or less, Zn: 8% or less, Ti: 0.25% or less, Mg : 0.5% or less, Cr: 0.2% or less, V: 0.2% or less may be included, or may be composed of other inevitable impurities.

The high strength aluminum alloy material 1 of the present embodiment, solely the _flux, K _1-3 AlF _4-6, selected from _ZnF 2, of _{ZnCl 2, KZnF 3, K 2} SiF 6 or mixed, It is good to have done.

As shown in FIG. 1, the high-strength aluminum alloy material 1 of the present embodiment has a brazing composition 3 applied to a predetermined position selected on one surface 2 a of an aluminum alloy core material 2. In 2b, the flux composition 4 is applied at positions corresponding to the front and back surfaces of the brazing composition 3 disposed on the one surface 2a. In the illustrated example, the brazing composition 3 applied in a rectangular shape is arranged in alignment at eight locations on one surface 2a, and the flux composition 4 is similarly disposed on the other surface 2b.
Note that the position, shape, and number of the brazing composition 3 and the flux composition 4 are not limited to this, and are appropriately determined depending on the shape of the member using the high-strength aluminum alloy material 1 and the brazing position. Details are described below.

FIG. 2 shows an example of a heat exchanger in which the high-strength aluminum alloy material 1 of the present embodiment is used.
The high-strength aluminum alloy material 1 of this embodiment can be used for each member which comprises the radiator (heat exchanger) 10 as shown in FIG. 2, This radiator 10 is used for the radiator of a motor vehicle, etc., for example, The header 11, the tube 12, the fins 13, and the side support 14 are schematically configured. The radiator 10 is generally configured by integrating the header 11, the tube 12 and the fins 13 by brazing and further attaching a resin tank by mechanical joining (caulking).

  In the radiator 10, the header 11 and the tube 12 are arranged around the insertion portion by inserting the end portion of each tube 12 into a plurality of slots (insertion holes) 11 a formed on the lower surface of the header 11. Both are brazed to each other using the brazing composition 3 (see FIG. 1), and the tube 12 and the fin 13 are brazed to the surface of the tube 12 using the brazing composition 3 (see FIG. 1). And they are assembled by brazing them together.

  Here, the brazing composition 3 or the flux composition 4 is preliminarily applied only to the position where the tube 12 is brazed to the upper and lower surfaces of the header 11. The high-strength aluminum alloy material 1 of the present embodiment is obtained by applying the brazing composition 3 or the flux composition 4 in advance on one or both surfaces (one surface 2a, the other surface 2b) only at the position where the brazing is performed. This eliminates wasteful brazing material when molding the high-strength aluminum alloy material 1 to obtain a member such as the header 11, and reduces the production cost because there is no application process after forming. can do. Further, since the brazing composition 3 or the flux composition 4 is not applied except for the position where the brazing is performed, it is possible to reduce coating film peeling or the like during the molding process using a mold or the like.

In the high-strength aluminum alloy material 1 shown in FIG. 1, the brazing composition 3 has a rectangular shape and is arranged at eight locations. In this example, the header of the radiator 10 shown in FIG. A total of eight 11 can be formed. In addition, each brazing composition 3 or flux product 4 applied and disposed at eight locations is previously placed in a predetermined position so as to be disposed only in the peripheral portion of the slot 11 a formed in the header 11. It has been applied.
On the other hand, the region of the high-strength aluminum alloy material 1 where the brazing composition part 3 or the flux composition 4 is not applied is arranged at a position other than the peripheral part of the slot 11 a in the header 11.
The header 11 formed using the high-strength aluminum alloy material 1 of the present embodiment is provided with the brazing composition 3 or the flux composition 4 only at a predetermined position where brazing and joining with the tube 10 are required. The above-mentioned composition is not disposed at a position where large machining such as bending is performed. As a result, the brazing material is not wasted, and coating film peeling during molding can be reduced.

  The high-strength aluminum alloy material 1 of the present embodiment can be used as a material for forming the header 11, the tube 12 and the fins 13, but is not limited to this, and various members in the automobile heat exchanger such as the side support 14 and the like. It can be used as a material for forming

  Hereinafter, the aluminum alloy core material 2, the brazing composition 3, and the flux composition 4 constituting the high-strength aluminum alloy material 1 of the present embodiment will be described in detail.

[Aluminum alloy core]
The reason for limiting the composition of the aluminum alloy core material 2 will be described below.

"Mn"
Manganese (Mn) combines with other alloy components (specifically, Si) to form an Al-Mn-Si compound, and this intermetallic compound is crystallized or precipitated, resulting in mechanical strength after brazing. Will improve.
Further, the formation of the intermetallic compound lowers the solid solubility of Si in the matrix, whereby the melting point of the matrix can be improved and the heat resistance can be increased.
The composition ratio of Mn is preferably in the range of 0.2% to 3.0% by mass.
When the composition ratio of Mn is less than 0.2%, it is difficult to obtain an effect of improving mechanical strength.
On the other hand, if the Mn composition ratio exceeds 3.0%, cracks and the like may occur at the surface and end portions during rolling. In addition, the appearance of giant crystals significantly reduces castability and rollability.

"Si"
Silicon (Si) forms an Al—Mn—Si compound, which is an intermetallic compound, together with Al and Mn, and is dispersed or dissolved in a matrix to improve the strength.
Moreover, the formation of the above-mentioned compound reduces the Mn solid solubility after brazing and improves the thermal conductivity.
The composition ratio of Si is preferably in the range of 0.2% to 1.5% by mass.
When the composition ratio of Si is less than 0.2%, it is difficult to obtain the strength improvement effect of the aluminum alloy core material 2.
On the other hand, if the Si composition ratio exceeds 1.5%, the melting point of the aluminum alloy core material 2 is lowered and melts during brazing. In addition, the appearance of giant crystals significantly reduces castability and rollability.

"Fe"
Iron (Fe) crystallizes or precipitates as an intermetallic compound, and improves the strength after brazing.
The composition ratio of Fe is preferably in the range of 0.05% to 2.5% by mass.
When the composition ratio of Fe is less than 0.05%, it is difficult to obtain an effect of improving strength after brazing.
When the composition ratio of Fe exceeds 2.5%, the corrosion rate becomes too fast. In addition, the appearance of giant crystals significantly reduces castability and rollability.

  The component composition of the aluminum alloy core material 2 of the present embodiment is based on the above-described components, but for the purpose of further improving the strength characteristics and the like, one or two additional elements described below are used. As mentioned above, it is good also as a component composition contained actively.

"Cu"
Copper (Cu) is dissolved in the matrix to improve the strength.
The composition ratio of Cu is preferably 0.7% or less by mass%.
If the composition ratio of Cu exceeds 0.7%, the corrosion rate becomes too fast, the melting point is lowered, and it melts during brazing. Further, when used as a sacrificial anode material, the potential becomes too noble and reduces the pitting corrosion resistance of the clad material.
Note that when the Cu composition ratio is less than 0.1%, the effect of improving the strength is insufficient, so that a composition ratio higher than this is preferable.

"Mg"
Magnesium (Mg), like Cu, dissolves in the matrix and improves strength.
The composition ratio of Mg is preferably 0.5% or less by mass%.
When the composition ratio of Mg exceeds 0.5%, the brazing property of the aluminum alloy core material is lowered.
In addition, when the composition ratio of Mg is less than 0.05%, the effect of improving the strength becomes insufficient, so that a composition ratio higher than this is preferable.

"Cr, V, Ti, Zr"
Chromium (Cr), vanadium (V), titanium (Ti), and zirconium (Zr) are dispersed and precipitated as fine intermetallic compounds after brazing to improve the strength.
The composition ratios of Cr, V, Ti, and Zr are mass%, Cr: 0.2% or less, V: 0.2% or less, Ti: 0.25% or less, Zr: 0.2% or less. It is preferable.
When the composition ratio of Cr, V, Ti, and Zr exceeds the above, workability is lowered, and self-corrosion resistance and thermal conductivity are lowered.
When the composition ratios of Cr, V, Ti, and Zr are Cr: less than 0.01%, V: less than 0.01%, Ti: less than 0.05%, and Zr: less than 0.05%, respectively. Since the effect of improving the strength is insufficient, it is preferable that the composition ratio is higher than that.

"Zn"
Zinc (Zn) is added in order to prevent the potential difference from the surface of the aluminum alloy core material and the member to be joined from becoming too large.
The composition ratio of Zn is preferably 8% or less by mass.
When the composition ratio of Zn exceeds 8%, the corrosion rate becomes too fast and the self-corrosion resistance is lowered.
In addition, since the above-mentioned effect will become inadequate when the composition ratio of Zn is less than 0.5%, it is preferable to set it as a composition ratio beyond this.

[Brazing composition]
As described above, in the brazing composition 3, one or more of Al—Si alloy powder, Al—Si—Zn alloy powder, and Si powder, a flux, and a binder are mixed. It becomes.
The total coating amount of the Al—Si based powder alloy brazing material, the Al—Si—Zn based alloy powder brazing material and the Si powder is preferably in the range of 1 to 150 g / m ² . By setting the total coating amount within the above range, good brazing properties can be obtained.

As the flux, it is preferable to use powders of single or mixed components selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _{3, and} K ₂ SiF ₆ .
The amount of flux contained in the brazing composition 3 and applied to the aluminum alloy core material 2 is preferably in the range of 3 to 50 g / m ² . By setting the coating amount of the flux within the above range, good brazing properties can be obtained.
An acrylic resin binder or the like can be used as the binder.

[Flux composition]
The flux composition 4 is formed by mixing a flux and a binder.
As the flux, it is preferable to use a powder of a single component or a mixed component selected from the above-mentioned K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ .
Also, the amount of flux contained in the flux composition 4 and applied to the aluminum alloy core is preferably in the range of 3 to 50 g / m ² as described above.
Moreover, an acrylic resin binder etc. can be used also about a binder similarly to the composition 3 for brazing.

  As a method for applying the brazing composition, the flux composition and the single flux to the aluminum alloy core material or the clad material, any method such as roll coating, die coating, and offset coating may be used. What is necessary is just to set it as the method of apply | coating with the predetermined space | interval in the width direction and a longitudinal direction to the board and strip | belt conveyed continuously.

According to the structure of the radiator 10 in which the high-strength aluminum alloy material 1 of the present embodiment is used as shown in FIG. 2, the brazing composition is provided in the header 11 in which the slot 11 a for inserting the tube 12 is provided on the lower surface. The tube 12 is joined to the header 11 by the object 3. And when brazing the radiator 10, after assembling each member, it heats to suitable temperature, such as in nitrogen atmosphere, and melt | dissolves a brazing material.
The brazing heat treatment is preferably performed at about 580 ° C. to 610 ° C., and the holding time is preferably about 1 minute to 10 minutes.
If the temperature during brazing is less than 580 ° C., partial melting of the brazing material and the aluminum alloy base material will not proceed, making it difficult to perform good brazing.
When the temperature at the time of brazing exceeds 610 ° C., there is a risk of significant erosion.

According to the radiator 10 using the high-strength aluminum alloy material 1 of the present embodiment described above, the brazing composition 3 is preliminarily applied only to the peripheral portion of the slot 11 a formed in the header 11. Therefore, when the header 11 is obtained by forming the high-strength aluminum alloy material 1, there is no waste brazing material, and there is no process for applying after the forming process, thereby reducing the production cost. Can do.
Moreover, since the brazing composition 3 is not applied except for the position where the brazing is performed, it is possible to reduce coating film peeling or the like during the molding process using a mold or the like.

As described above, according to the high-strength aluminum alloy material 1 for an automobile heat exchanger of the present embodiment, an Al—Si based alloy powder, an Al—Si—Zn based alloy is formed on one surface or both surfaces of the aluminum alloy core material 2. One or more of powder and Si powder, a brazing composition 3 in which a flux and a binder are mixed, or a flux composition 4 in which a flux and a binder are mixed are applied. A high-strength aluminum alloy material for automobile heat exchangers, wherein the flux is selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ , or a mixture thereof The brazing composition 3 or the flux composition 2 is applied only at a predetermined position necessary after processing.
As a result, waste of powder brazing material, Si powder, flux, etc. is reduced, and coating film peeling at the time of molding can be reduced.
Therefore, the high-strength aluminum alloy material 1 for automobile heat exchanger can be manufactured at low cost.

The high-strength aluminum alloy material of the present invention is not limited to the above-described configuration. For example, Zn is 8% by mass on one side or both sides of the one surface 2a and the other surface 2b of the aluminum alloy core material 2 in mass%. Hereinafter, Mn: 0.1% to 3.0%, Si: 0.05% to 1.5%, Fe: 0.05% to 2.5%, and Cu: 0. 1% or less of 2% or less, Zr: 0.2% or less, Ti: 0.25% or less, Mg: 0.5% or less, Cr: 0.2% or less, V: 0.2% or less It may be configured as a clad material comprising a sacrificial anode material (not shown) which contains seeds or more, is composed of other inevitable impurities, and is electrochemically lower than the aluminum alloy core material 2.
The reason for limiting the component composition of the sacrificial anode material is the same as the component composition of the aluminum alloy core material 2, and the details are omitted.

The high-strength aluminum alloy material of the present invention is a clad material in which an Al—Si alloy brazing material or an Al—Si—Zn alloy brazing material is bonded to one surface of an aluminum alloy core material, and flux is applied to the other surface. In the case of an applied configuration, the flux may be arranged only at a predetermined position necessary for processing.
Also in this case, the total bonding amount of the Al—Si alloy brazing material and the Al—Si—Zn alloy brazing material is in the range of 1 to 150 g / m ² , and the flux application amount is 3 to 3. By setting it within the range of 50 g / m ² , good brazing properties can be obtained.

  In the high-strength aluminum alloy material of the present invention, the sacrificial anode material is bonded to one side of the aluminum alloy core material, and the Al—Si alloy brazing material or Al—Si—Zn alloy brazing material is bonded to the other surface. It may be configured as a clad material.

  Examples of the high-strength aluminum alloy material for automobile heat exchanger according to the present invention will be described below.

[Production process]
An aluminum alloy having a component composition as shown in Table 1 was cast and subjected to intermediate annealing and cold rolling treatment to produce a rolled material (aluminum alloy core material or clad material) having a thickness of 1.0 mm.
As the brazing composition and the flux composition, those having the component compositions as shown in Table 2 were used and applied in a combination form shown in Table 3 to obtain an aluminum alloy material. At this time, as shown in FIG. 1, the positions of the brazing composition and the flux composition to the aluminum alloy core material are arranged in 8 positions and arranged on both sides, and the high-strength aluminum alloy material according to the present invention ( Example) was obtained.
Further, a conventional aluminum alloy material (comparative example) is obtained in the same manner as in the above-described example except that the brazing composition and the flux composition are arranged on the entire surface of the aluminum alloy core material or the clad material. It was.

[Evaluation of formability]
Using the samples of the examples and comparative examples, the press forming process of the header 10 of the radiator 10 shown in FIG. 2 was performed by the press forming process shown in FIG. 3, and the moldability was evaluated. At this time, in the samples of each example, a total of eight headers 11 were obtained from one high-strength aluminum alloy material (see FIG. 1), and the brazing composition and flux composition application positions (total 8 ) Is arranged around the slot 11a.
In press molding, the molding process is performed in the order of a draw process (FIG. 3A), a trim process (FIG. 3B), a bending process (FIG. 3C), and a piercing process (FIG. 3D). After the test, the moldability was determined according to the following criteria by visual confirmation (marked with ◯ ×).
(1) ○: There was no coating film peeling.
(2) Δ: Some peeling of the coating film was confirmed.
(3) x: A lot of coating film peeling was confirmed.

[Evaluation of brazeability]
Using the aluminum alloy materials of the examples and comparative examples, a header for an automobile radiator was created in the process shown in FIG. 3 and then brazed in combination with a tube. Brazing properties were determined according to the following criteria.
In addition, about brazing heat processing, after hold | maintaining for 3 minutes at the temperature of 605 degreeC in nitrogen gas atmosphere, it cooled to room temperature (25 degreeC) with the cooling rate of -100 degreeC / min.
(1) ○: The ratio of the remaining number of joints / the total number of joints was 100%.
(2) x: The ratio of the remaining number of joints / the total number of joints was less than 100%.

  Table 3 shows a list of evaluation test results of each example and comparative example.

From the results shown in Table 3, in the samples of the high-strength aluminum alloy materials according to the present invention of Examples 1 to 12, both evaluation items for formability and brazeability are all judged as ◯, and in a predetermined position in advance. It has been clarified that the high-strength aluminum alloy material of the present invention, in which a brazing material is arranged and formed, has excellent characteristics.
In addition, the sample shown in Example 12 was molded at a processing rate of 49.7% by changing the shape, while the samples of Examples 1 to 11 were molded at a processing rate of 41.5%. It has been processed. Also in this case, like the other example samples, the high-strength aluminum alloy material of the present invention was free from peeling of the coating film, and a good molded product could be obtained.
The processing rate described in this example is a numerical value converted as a thickness reduction ratio of the material, and data of a portion with the highest thickness reduction ratio was used.

On the other hand, the samples of the conventional aluminum alloy materials of Comparative Examples 1 to 12 were all evaluated as x for the evaluation items of formability and brazing.
Further, in Comparative Example 12 in which the sample was processed with a processing rate of 49.7% in the same manner as in Example 12, compared with the other Comparative Example Sample (Comparative Example 1) in which the processing rate was 41.5%. The peeling of the coating film was remarkable and the brazing property was greatly reduced.
It became.

  Based on the above results, the high-strength aluminum alloy material for automobile heat exchanger according to the present invention in which the brazing material is arranged in advance on one or both surfaces of the aluminum alloy core material has high formability and brazing properties. Became clear.

It is the schematic which shows an example of the aluminum alloy material for motor vehicle heat exchangers of this invention. It is the schematic which shows an example of the motor vehicle heat exchanger which uses the aluminum alloy material for motor vehicle heat exchangers of this invention. It is a figure which shows one Example of the aluminum alloy material for motor vehicle heat exchangers of this invention, and is the schematic explaining each process of a press molding process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Aluminum alloy material (high-strength aluminum alloy material) for motor vehicle heat exchangers, 2 ... Aluminum alloy core material, 2a ... One side, 2b ... Other side, 3 ... Brazing composition, 4 ... Flux composition, 10 ... Heat Exchanger, 11 ... Header, 13 ... Tube, 14 ... Fin

Claims (7)

One or more of Al—Si based alloy powder, Al—Si—Zn based alloy powder, Si powder, flux and binder will be mixed on one or both sides of the aluminum alloy core. In a high-strength aluminum alloy material for automobile heat exchangers to which a flux composition formed by mixing a flux or a binder is applied.
The flux is selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ , or a mixture thereof,
A high-strength aluminum alloy material for an automobile heat exchanger, wherein the brazing composition or the flux composition is applied only to a predetermined position necessary after processing. Al-Si alloy powder, Al-Si-Zn based on one or both sides of a clad material in which an Al-Si based alloy brazing material or Al-Si-Zn based alloy brazing material is bonded to one side of an aluminum alloy core material A brazing composition in which one or more of alloy powder and Si powder, a flux and a binder are mixed, or a flux composition in which a flux and a binder are mixed is applied. In high-strength aluminum alloy materials for automotive heat exchangers,
The flux is selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ , or a mixture thereof,
A high-strength aluminum alloy material for an automobile heat exchanger, wherein the brazing composition or the flux composition is applied only to a predetermined position necessary after processing. Sacrificial anode material is bonded to one side of the aluminum alloy core material, and Al-Si alloy brazing material or Al-Si-Zn alloy brazing material is bonded to the other surface. Alloy powder, Al-Si-Zn alloy powder, one or more of Si powder, flux and binder are mixed, or flux and binder are mixed In the high-strength aluminum alloy material for automobile heat exchangers to which the flux composition is applied,
The flux is selected from K _1-3 AlF _4-6 , ZnF ₂ , ZnCl ₂ , KZnF _3, K ₂ SiF ₆ , or a mixture thereof,
A high-strength aluminum alloy material for an automobile heat exchanger, wherein the brazing composition or the flux composition is applied only to a predetermined position necessary after processing.   The sacrificial anode material is mass%, Zn: 8% or less, Mn: 0.1% or more and 3.0% or less, Si: 0.05% or more and 1.5% or less, Fe: 0.05% or more 2 0.5% or less, Cu: 0.2% or less, Zr: 0.2% or less, Ti: 0.25% or less, Mg: 0.5% or less, Cr: 0.2% or less, V: It is a sacrificial anode material containing one or more of 0.2% or less, consisting of other inevitable impurities, and being electrochemically baser than the aluminum alloy core material. The high-strength aluminum alloy material for automobile heat exchangers according to claim 3. The aluminum alloy core material is, by mass%, Mn: 0.2% to 3.0%, Si: 0.2% to 1.5%, Fe: 0.05% to 2.5% Contains,
Furthermore, Cu: 0.7% or less, Zr: 0.2% or less, Zn: 8% or less, Ti: 0.25% or less, Mg: 0.5% or less, Cr: 0.2% or less, V: Containing one or more of 0.2% or less,
The high-strength aluminum alloy material for an automobile heat exchanger according to any one of claims 1 to 4, which is composed of other inevitable impurities. The high-strength aluminum alloy material for an automobile heat exchanger according to any one of claims 1 to 5, wherein an application amount of the flux is in a range of ³ to 50 g / m2. The total application amount of the Al-Si-based powder alloy brazing material, the Al-Si-Zn-based alloy powder brazing material, and the Si powder is in the range of 1 to 150 g / m ² . A high-strength aluminum alloy material for automobile heat exchangers according to any one of the above.

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