Aluminum alloy clad material and heat exchanger that includes tube obtained by forming the clad material
a technology of clad material and heat exchanger, which is applied in the direction of manufacturing tools, soldering devices, light and heating equipment, etc., can solve the problems of difficult to reduce the amount of zn thermally sprayed to the extruded tube, difficult to achieve a potential difference, and difficult to reduce the zn content of the sacrificial anode material. , to achieve the effect of excellent outer-side corrosion resistan
Inactive Publication Date: 2015-12-17
FURUKAWA SKY ALUMINUM CORP
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Benefits of technology
The invention provides an aluminum alloy clad material that can be used to make heat exchangers (especially for cars) with excellent resistance to corrosion. This material can be formed into tubes for use in heat exchangers. The technical effect is improved performance and durability of heat exchangers made with this material.
Problems solved by technology
However, it is difficult to reduce the amount of Zn thermally sprayed to the extruded tube from the viewpoint of thermal spraying efficiency.
When using the tube obtained by bending an aluminum alloy sheet material, since the potential of the sacrificial anode material increases due to the effects of diffusion of Cu included in the core material (Al—Mn—Cu-based alloy), and it is difficult to achieve a potential difference sufficient to obtain the sacrificial anode effect when the amount of Zn is reduced, it is difficult to reduce the Zn content in the sacrificial anode material.
It is difficult to increase the thickness of the sacrificial anode layer by increasing the cladding ratio from the viewpoint of production cost.
However, since a layer that is formed by Cu diffused from the filler metal and has a higher potential is thin, and the potential difference between the layer having a higher potential and the core material is small, most of the core material is consumed due to corrosion, and the effect of suppressing occurrence of a through-hole is insufficient immediately before a through-hole occurs.
Method used
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example 1
[0050]An ingot of a sacrificial anode material alloy (S1 to S11) having the composition shown in Table 1, and ingots of a core material alloy and an inner cladding material alloy (C1 to C20) having the composition shown in Table 2, were cast using a semi-continuous casting method. The ingot of the sacrificial anode material alloy was homogenized at 500° C. for 8 hours, and hot-rolled (start temperature: 500° C.) to a given thickness. The ingot of the core material alloy was homogenized at 500° C. for 8 hours, and machined. The ingot of the inner cladding material alloy was homogenized at 500° C. for 8 hours, and hot-rolled (start temperature: 500° C.) to a given thickness.
[0051]The hot-rolled sacrificial anode material alloy and the hot-rolled inner cladding material alloy were then machined. The aluminum alloys were stacked in the combination shown in Table 3, hot-rolled (start temperature: 500° C.) to a thickness of 3 mm, cold-rolled, subjected to process annealing at 400° C., and...
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Abstract
An aluminum alloy clad material can produce a heat exchanger tube that exhibits excellent outer-side corrosion resistance when formed into a tube. The aluminum alloy clad material has a three-layer structure in which one side of a core material is clad with an inner cladding material, and the other side of the core material is clad with a sacrificial anode material, the core material being formed of an Al—Mn—Cu alloy that includes 0.6 to 2.0% of Mn and 0.03 to 1.0% of Cu, with the balance being aluminum and unavoidable impurities, the inner cladding material being formed of an Al—Mn—Cu alloy that includes 0.6 to 2.0% of Mn and 0.2 to 1.5% of Cu, with the balance being aluminum and unavoidable impurities, the sacrificial anode material being formed of an Al—Zn—Cu alloy that includes 0.5 to 6.0% of Zn and 0.03 to 0.3% of Cu, with the balance being aluminum and unavoidable impurities, and the relationship “Cu content (%) in sacrificial anode material≦Cu content (%) in core material≦Cu content (%) in inner cladding material” being satisfied. The aluminum alloy clad material may have a two-layer structure that includes the core material and the sacrificial anode material.
Description
TECHNICAL FIELD[0001]The present invention relates to an aluminum alloy clad material. More specifically, the invention relates to an aluminum alloy clad material that can produce a heat exchanger tube that exhibits excellent outer-side corrosion resistance when formed into a tube. The invention also relates to a heat exchanger that includes a tube obtained by forming the clad material.BACKGROUND ART[0002]An aluminum alloy extruded tube or a tube obtained by bending an aluminum alloy sheet material has been used as a refrigerant tube (refrigerant passage) for an aluminum heat exchanger that is joined by brazing. Such a refrigerant tube is designed so that a sacrificial anode effect due to a Zn diffusion layer is achieved by thermally spraying Zn to the side of the extruded tube that forms the outer side of the refrigerant tube, or cladding the side of the tube (obtained by bending an aluminum alloy sheet material) that forms the outer side of the refrigerant tube with an Al—Zn-based...
Claims
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IPC IPC(8): C22C21/10C22C21/02F28F19/06C23F13/14C23F13/18C22C21/14C22C21/00
CPCC22C21/10C22C21/14C22C21/02F28F19/06C23F13/14C23F13/18C22C21/00B23K35/0238B23K35/28B23K35/286B32B15/016B23K2101/14F28F1/02F28F21/084F28F21/089F28F2275/04
Inventor TANAKA, TOSHIKAZUSHOJI, TOMOHIROFUJIMURA, RYOKOYAMASHITA, NAOKITANAKA, HIROKAZU
Owner FURUKAWA SKY ALUMINUM CORP