KR102382428B1 - Receiver drier for vehicle with high corrosion resistance aluminum alloy and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a receiver dryer for an automobile and a method for manufacturing the same, and as an aluminum alloy, in weight%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (0%) %), Mn: 0.9~1.5%, Ti: 0.03~0.15%, Cr: 0.03~0.15%, and Zr: 0.03~0.15% Manufacturing, extruding and drawing the billet to manufacture an aluminum pipe, and forming and bending the left and right ends of the aluminum pipe to form a receiver dryer shape Car using a high corrosion resistance aluminum alloy It relates to a method for manufacturing a receiver dryer for use.
The receiver dryer for automobiles according to the present invention is an aluminum alloy with improved corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength by additionally adding Ti, Cr and Zr components to the aluminum alloy, or in particular adding them in the same ratio It is possible to provide a receiver dryer for a vehicle using the and a manufacturing method thereof.

Description

Receiver dryer for automobile using high corrosion-resistance aluminum alloy and manufacturing method thereof

The technical idea of the present invention relates to a receiver dryer for a vehicle using a high corrosion resistance aluminum alloy and a method for manufacturing the same, and more particularly, an aluminum alloy having improved corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength. It relates to a receiver dryer for use and a method for manufacturing the same.

The automobile air conditioner/engine cooling system is an air conditioning system that controls the cooling and dehumidification of a refrigerant by repeating the process of compression-condensation-expansion-evaporation to keep the interior of the vehicle in a comfortable state. The main parts include a blower that supplies wind, an evaporator 80 that evaporates refrigerant, a compressor 50 that compresses, and a condenser 20 that condenses with a cooling fan, a receiver dryer 10 that removes moisture and foreign substances, There are an expansion valve 70 that expands the refrigerant, a pipe 30 connecting the same, and hoses 40 and 60, and there are also a controller and various safety devices that automatically or manually control this.

In particular, the condenser 20 of the air conditioner operates to remove heat from gas or steam, and when sufficient heat is removed, liquefaction is achieved. The condenser 20 is a kind of radiator for discharging the heat of the gaseous refrigerant supplied from the compressor 50 to the atmosphere to form a liquid refrigerant, and the more heat emitted, the better. The high-temperature, high-pressure refrigerant sent from the compressor 50 is cooled by the temperature of the outside air to be liquefied, and then sent to the receiver dryer 10 made of aluminum in a long cylindrical shape. The receiver dryer 10 is a tank for storing the refrigerant and serves to remove moisture mixed in the refrigerant. When a vehicle is operated for a long period of time, internal corrosion occurs due to the condensate generated inside, and in particular, external corrosion occurs severely due to a deicing agent such as calcium chloride sprayed on the road. Therefore, this alloy is required to have superior properties in high corrosion resistance.

In aluminum alloys commonly used in automobiles, pure aluminum has low strength, so various elements (Mn, Si, Mg, Cu, Zn, Cr, etc.) are added to improve strength by precipitation hardening. Aluminum has excellent corrosion resistance because the oxide film protects the base material in an environment of pH 4.5 to 8.5, but has a high ionization tendency, so it corrodes severely when in contact with Fe, Cu, Pb, etc. under a corrosive environment.

3xxx series aluminum alloys are alloys with Mn as the main additive, and are non-heat-treated alloys with various properties by cooling. Compared to pure aluminum, the strength is slightly higher, and the weldability, corrosion resistance, and molding processability are good. In particular, 3003 is a representative alloy of this type, and the addition of Mn does not reduce the workability and corrosion resistance of pure aluminum, but slightly increases the strength. These alloys have a wide range of uses for aluminum objects, building materials, containers, and the like. The 3004 and 3014 aluminum alloys in which Mg is added to the alloy equivalent to 3003 by 1% by weight are alloys with further increased strength. However, it does not satisfy the formability and strength that meet the characteristics of parts that require higher quality, and also has a problem of corrosion in a salt water environment.

Therefore, there is a need for a receiver dryer for automobiles using an aluminum alloy having improved corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength, and a manufacturing method thereof.

1. Japanese Patent No. 04411803 2. Korean Patent Publication No. 10-2005-0035447

The technical problem to be achieved by the technical idea of the present invention is to provide a receiver dryer for automobiles using an aluminum alloy having improved corrosion resistance at the level of excellent tensile strength and yield strength.

The technical problem to be achieved by the technical idea of the present invention is to provide a method for manufacturing a receiver dryer for automobiles using a high corrosion resistance aluminum alloy.

However, these tasks are exemplary, and the technical spirit of the present invention is not limited thereto.

The method for manufacturing a receiver dryer for a vehicle using a high corrosion resistance aluminum alloy according to the technical idea of the present invention for achieving the above technical problem is as a weight%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (0%) Excluding), Fe: 0.2% or less (excluding 0%), Mn: 0.9 to 1.5%, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15%, Manufacturing an aluminum billet made of the remaining Al and unavoidable impurities, manufacturing an aluminum pipe by extruding and drawing the billet, and forming and bending the left and right ends of the aluminum pipe to form a receiver dryer shape. there is.

In some embodiments of the present disclosure, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% may all be included.

In some embodiments of the present invention, the Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% including all, the Ti, Cr, and Zr may be included in the same ratio .

In some embodiments of the present invention, Ti: 0.05 to 0.1%, Cr: 0.05 to 0.1%, and Zr: may include all of 0.05 to 0.1%.

In some embodiments of the present invention, the Ti: 0.05 to 0.1%, Cr: 0.05 to 0.1%, and Zr: including all of 0.05 to 0.1%, the Ti, Cr and Zr may be included in the same ratio .

Receiver dryer for automobiles manufactured from an aluminum alloy according to the technical idea of the present invention for achieving the above technical problem is as a weight%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn: 0.9 to 1.5%, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% of at least one of, and the remaining Al It can be made of an aluminum alloy consisting of unavoidable impurities.

The receiver dryer for automobiles according to the technical idea of the present invention can provide a receiver dryer for automobiles using an aluminum alloy with improved corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength.

In addition, it is possible to provide a method for manufacturing a receiver dryer using an aluminum alloy having improved corrosion resistance at the level of excellent tensile strength and yield strength.

The above-described effects of the present invention have been described by way of example, and the scope of the present invention is not limited by these effects.

1 is a block diagram illustrating an automobile air conditioner/engine cooling system.
2 is a configuration diagram of an automobile air conditioner (heat exchanger) and a receiver dryer.
3 is a flowchart showing a method for manufacturing a high corrosion resistance receiver dryer according to an embodiment of the present invention.
4 is a photograph showing the evaluation of workability of a specimen prepared by using an aluminum alloy composition according to an embodiment of the present invention.
Figures 5a and 5b is a photograph before and after the corrosion resistance evaluation of the receiver dryer manufactured with an aluminum alloy composition according to an embodiment of the present invention.
6a and 6b are photographs before and after corrosion resistance evaluation of a receiver dryer manufactured with an aluminum alloy composition according to a comparative example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention are provided to more completely explain the technical idea of the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, The scope of the technical idea is not limited to the following examples. Rather, these embodiments are provided so as to more fully and complete the present disclosure, and to fully convey the technical spirit of the present invention to those skilled in the art. As used herein, the term “and/or” includes any one and all combinations of one or more of those listed items. The same symbols refer to the same elements from time to time. Furthermore, various elements and regions in the drawings are schematically drawn. Therefore, the technical spirit of the present invention is not limited by the relative size or spacing drawn in the accompanying drawings.

4 is a flowchart illustrating a method of manufacturing a receiver dryer for high corrosion resistance automobiles according to an embodiment of the present invention. 4 , the method for manufacturing a receiver dryer for a vehicle using the high corrosion resistance aluminum alloy composition according to the present invention includes an aluminum billet manufacturing step, an aluminum pipe manufacturing step, and forming into a receiver dryer shape.

The aluminum billet manufacturing step is by weight, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn: 0.9 to 1.5% , Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15%, including at least one of, and the remaining Al and unavoidable impurities to prepare an aluminum billet.

Cu serves to improve the strength and ductility of the alloy according to the hardening effect in the alloy. Cu is preferably controlled in the range of more than 0% by weight to 0.1% by weight (0wt.%<Cu≤0.1wt.%). More preferably, Cu is controlled in the range of more than 0% by weight to 0.05% by weight (0wt.%<Cu≤0.05wt.%). When Cu exceeds 0.1 wt%, it is preferably added in an amount of 0.1 wt% or less as corrosion resistance is lowered, and more preferably in an amount of 0.05 wt% or less.

Si serves to improve strength without deteriorating corrosion resistance in the alloy. Si is precipitated to improve mechanical properties. Si is preferably controlled in the range of more than 0% by weight to 0.15% by weight (0wt.%<Si≤0.15wt.%). More preferably, Si is controlled in the range of more than 0 wt% to 0.05 wt% (0 wt.%<Si≤0.05 wt.%). When Si exceeds 0.15 wt%, moldability may deteriorate as well as the surface quality of the molded product, so it is preferable to be added in an amount of 0.05 wt% or less.

Fe can contribute to strength improvement by increasing the density of the alloy in the alloy. Fe is preferably controlled in the range of more than 0% by weight to 0.2% by weight (0wt.%<Fe≤0.2wt.%). More preferably, Fe is adjusted in the range of 0.05 wt% or more to 0.15 wt% (0.05 wt.%≤Fe≤0.15 wt.%). If Fe is more than 0.2 wt %, ductility may be reduced as well as extrudability and productivity, which may lead to corrosion of the material. Therefore, the upper limit of Fe is preferably 0.2 wt% or less, more preferably 0.15 wt% or less.

Mn plays a role in increasing the softening resistance at high temperature and improving the surface treatment properties without significantly weakening the corrosion resistance of the alloy. In addition, the strength is improved through the solid solution strengthening effect and the fine precipitate dispersion effect. Mn is preferably adjusted in the range of 0.9 wt% or more to 1.5 wt% (0.9wt.%≤Mn≤1.5wt.%). More preferably, Mn is adjusted in the range of 1.0 wt% or more to 1.5 wt% (1.0 wt.%≤Mn≤1.5wt.%). When Mn is less than 0.9 wt %, it is difficult to expect an effect, and when Mn is more than 1.5 wt %, castability is deteriorated, which is not good.

Ti plays a role in improving formability and strength through grain refinement in the alloy. Ti is preferably adjusted in the range of 0.03 wt.% or more to 0.15 wt.% (0.03 wt.%≤Ti≤0.15 wt.%). More preferably, Ti is adjusted in the range of 0.05 wt% or more to 0.1 wt% (0.05 wt.%≤Ti≤0.1 wt.%). When Ti is less than 0.03% by weight, it is difficult to expect an effect, and when Ti is more than 0.15% by weight, large and coarse intermetallic compounds such as TiAl ₃ are produced in large amounts, which is not good because the mechanical properties of the alloy are deteriorated. When Ti is less than 0.03 wt%, it is difficult to expect an effect, and when Ti is more than 0.15 wt%, mechanical properties are deteriorated, which is not good.

Cr forms a compound with Al in the alloy and distributes it at grain boundaries, thereby suppressing precipitation during aging and improving elongation. Cr is preferably adjusted in the range of 0.03 wt% or more to 0.15 wt% (0.03 wt.%≤Cr≤0.15 wt.%). More preferably, Cr is adjusted in the range of 0.05 wt% or more to 0.1 wt% (0.05 wt.%≤Cr≤0.1 wt.%). When Cr is less than 0.03 wt%, it is difficult to expect an effect, and when Cr is more than 0.15 wt%, the strength is lowered, which is not good.

Zr plays a role in improving corrosion resistance as well as strength improvement at high temperatures in the alloy. Zr is preferably adjusted in the range of 0.03 wt% or more to 0.15 wt% (0.03 wt.%≤Zr≤0.15wt.%). More preferably, Zr is adjusted in the range of 0.05 wt% or more to 0.1 wt% (0.05 wt.%≤Zr≤0.1wt.%). When Zr is less than 0.03 wt%, it is difficult to expect an effect, and when Zr is more than 0.15 wt%, cracks or cracks occur, which is not good.

In particular, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% may all be included. In addition, the Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% including all, the Ti, Cr and Zr may be included in the same ratio. More preferably, Ti: 0.05 to 0.1%, Cr: 0.05 to 0.1%, and Zr: 0.05 to 0.1% may be included.

As above, the high corrosion-resistance aluminum alloy according to the present invention is a weight%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn : 0.9 to 1.5%, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15%, and may include the remaining Al and unavoidable impurities.

More preferably, the Ti: 0.05 to 0.1%, Cr: 0.05 to 0.1%, and Zr: including all of 0.05 to 0.1%, the Ti, Cr and Zr are included in the same amount ratio at the level of excellent tensile strength and yield strength Improves corrosion resistance in salt water environment.

The aluminum pipe manufacturing step is a step of manufacturing an aluminum pipe by extruding and drawing the billet, and the forming into the receiver dryer shape is a step of forming and bending the left and right ends of the aluminum pipe to form a receiver dryer shape.

Receiver dryer for automobile according to the present invention as a weight%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn: 0.9~ At 1.5%, Ti: 0.03 to 0.15%, Cr: 0.03 to 0.15%, and Zr: 0.03 to 0.15% of at least one of, and the remaining Al and unavoidable impurities may be prepared as an aluminum alloy.

The highly corrosion-resistant aluminum alloy for manufacturing a receiver dryer for automobiles according to the present invention may have excellent corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength by adding Ti, Cr and Zr in equal amounts.

As described above, the receiver dryer for automobiles can be manufactured with the high corrosion-resistance aluminum alloy, and the pipe structure used as the refrigerant line, the coolant line, and the variable speed oil cooler line of the automobile refrigerant transport system can be manufactured by the extrusion and drawing method. .

Hereinafter, details of the process of the present invention will be described through Examples and Experimental Examples.

Aluminum alloy preparation

Table 1 is a table showing the composition of the high corrosion resistance aluminum alloy according to an embodiment of the present invention in weight %. An aluminum alloy composition (Examples 1 to 10) according to the present invention and an aluminum alloy composition compared thereto (Comparative Examples 1 to 5) were prepared in the following composition ratios. In Comparative Examples 4 and 5, compositions of the existing 3005 alloy and 3004 alloy were used. In Table 1, the aluminum alloy consists of Al and unavoidable impurities except for the alloy composition.

No Cu Mg Si Fe Mn Zn Ti Cr Zr Al Example 1 0.03 0 0.03 0.09 1.16 0 0.04 0.04 0.04 98.57 Example 2 0.03 0 0.03 0.09 1.16 0 0.05 0.05 0.05 98.54 Example 3 0.03 0 0.03 0.09 1.16 0 0.07 0.07 0.07 98.48 Example 4 0.03 0 0.03 0.09 1.15 0 0.09 0.09 0.09 98.43 Example 5 0.03 0 0.03 0.09 1.15 0 0.07 0.04 0.04 98.55 Example 6 0.03 0 0.03 0.09 1.15 0 0.04 0.07 0.04 98.55 Example 7 0.03 0 0.03 0.09 1.15 0 0.07 0.07 0.12 98.44 Example 8 0.03 0 0.03 0.09 1.15 0 0.07 0.12 0.07 98.44 Example 9 0.03 0 0.03 0.09 1.15 0 0.12 0.07 0.07 98.44 Example 10 0.03 0 0.03 0.09 1.15 0 0.12 0.12 0.12 98.34 Comparative Example 1 0.03 0 0.03 0.09 1.16 0 0.02 0.02 0.02 98.63 Comparative Example 2 0.03 0 0.03 0.09 1.16 0 0.18 0.18 0.18 98.15 Comparative Example 3 0.03 0 0.03 0.09 1.15 0 0.21 0.21 0.21 98.07 Comparative Example 4 0.3 0.2 0.6 0.7 0.8 0.25 0.1 0.2 0 96.85 Comparative Example 5 0.25 0.8 0.3 0.7 One 0.25 0 0 0 96.7

Pipe fabrication and evaluation

Tables 2 and 3 are tables showing the measured values of the mechanical properties according to the aluminum alloy composition according to the embodiment of the present invention. Among the alloys according to the present invention, 5 types of alloys of Examples 2 to 4 and Comparative Examples 4 and 5 were prepared with an outer diameter of 8 mm, a thickness of 1T specimen, and a pipe with an outer diameter of 12 mm and a thickness of 1.2T, respectively. Yield strength, tensile strength and elongation were measured using a universal testing machine.

division Specimen Characteristics yield point maximum tensile strength Other No outer diameter thickness burglar burglar elongation (stress) (stress) (strain) (mm) (mm) (N/㎟ (N/㎟ (%) Example 2 8 1.01 66 140 19.4 Example 3 8 1.01 74 157 21.1 Example 4 8 1.01 68 150 20.9 Comparative Example 4 8 1.01 48 94 18.8 Comparative Example 5 8 1.01 63 105 18.1

division Specimen Characteristics yield point maximum tensile strength Other No outer diameter thickness burglar burglar elongation (stress) (stress) (strain) (mm) (mm) (N/㎟ (N/㎟ (%) Example 2 12 1.2 47 120 42.5 Example 3 12 1.2 51 125 50.1 Example 4 12 1.2 49 123 51.2 Comparative Example 4 12 1.2 33 82 41.5 Comparative Example 5 12 1.2 50 94 40.6

In a pipe with an outer diameter of 8 mm and a thickness of 1T, a tensile strength of 95 to 160 N/mm2, a yield strength of 50 N/mm2 or more, and an elongation of 12% are satisfied. to 127 N/mm 2 , yield strength of 35 N/mm 2 or more, and elongation of 35% are satisfied, the necessary physical properties for processing are satisfied.

As shown in Table 2, in the case of Examples 2 to 4 in a specimen with an outer diameter of 8 mm and a thickness of 1T, the tensile strength of 140 to 157 N/mm2, the yield strength of 66 to 74 N/mm2, and the elongation of 19 to 22% of the required physical properties are satisfied. It was confirmed that the tensile strength of Comparative Example 4 was lower than the required physical properties, and the tensile strength and elongation of Comparative Examples 4 and 5 were lower than those of Examples 2 to 4.

In addition, as shown in Table 3, in the case of Examples 2 to 4 in a specimen with an outer diameter of 12 mm and a thickness of 1.2T, the tensile strength of 120 to 125 N/mm2, the yield strength of 47 to 51 N/mm2, and the elongation of 42 to 52% were satisfied. do. In comparison, it was confirmed that Comparative Examples 4 to 5 had a tensile strength lower than the required physical properties, and elongation had a lower level than Examples 2 to 4.

4 and Table 4 are photographs and results showing the evaluation of workability of a specimen prepared using an aluminum alloy composition according to an embodiment of the present invention. Four types of workability evaluations of (a) bending, (b) welding, (c) caulking, and (d) forming were performed on each of the manufactured 8 mm and 12 mm outer diameter specimens, and the workability was not good in each of the four workability evaluations. The defective rate was confirmed by the number of non-existent specimens. In the case of Examples 2 to 4, there were no defective specimens after the four workability evaluations, indicating excellent results with a defective rate of 0%. In the existing materials of Comparative Examples 4 and 5, 5 to 20 defective specimens were identified in the bending and forming evaluation, and it was confirmed that a significant improvement in workability was observed compared to a failure rate of 5 to 20%.

NO. outside diameter defective rate (a) bending (b) welding (c) caulking (d) Forming Example 2 8mm 0% 0% 0% 0% Example 3 0% 0% 0% 0% Example 4 0% 0% 0% 0% Comparative Example 4 5% 0% 0% 10% Comparative Example 5 10% 0% 0% 15% Example 2 12mm 0% 0% 0% 0% Example 3 0% 0% 0% 0% Example 4 0% 0% 0% 0% Comparative Example 4 10% 0% 0% 15% Comparative Example 5 20% 0% 0% 20%

Receiver dryer manufacturing and corrosion resistance evaluation

An aluminum billet was prepared with an aluminum alloy composition according to Examples 1 to 10 of the present invention and an aluminum alloy composition compared (Comparative Examples 1 to 5), and an aluminum pipe was manufactured by extruding and drawing the billet, and then the aluminum pipe A receiver dryer is manufactured by forming and bending the left and right ends of the receiver to form a receiver dryer shape.

After manufacturing the thickness 1.6T and 1.8T receiver dryer, corrosion resistance was evaluated. Figure 4 is a photograph before and after the corrosion resistance evaluation of the receiver dryer manufactured with the aluminum alloy composition according to the embodiment of the present invention, Figure 5 is a photograph before and after the corrosion resistance evaluation of the receiver dryer manufactured with the aluminum alloy composition according to the comparative example of the present invention am. As shown in Fig. 5(b), LEAK can be confirmed after corrosion resistance evaluation.

Table 5 is the result of completing the corrosion resistance test of the receiver dryer manufactured with the aluminum alloy composition of Table 1. Corrosion resistance test (SWAAT-Seawater Acidified Test) investigates corrosion resistance by accelerating corrosion by spraying saline solution on a sample according to the regulations. Nitrogen pressure of 1.6± 0.04 MPa (16.7kgf/cm ² ) is applied inside the condenser, Concentration: Synthetic sea salt 42g/1L, Spray amount: 1-2 ml/h, Specific gravity: 1.0255 ~ 1.0400, PH: 2.8~3.0 ( 500 to 2000 hours in accordance with ASTM G85 94-A3).

Distilled water was put in the tank, and the synthetic sea salt was added according to the amount of distilled water and stirred until completely dissolved. After adding acetic acid to the amount of distilled water and stirring, it was checked whether the test solution satisfies the condition with a hydrometer and a PH meter. Test run for 1 hour to check whether the amount of spray meets the conditions, and put the sample in the chamber. Set the atmosphere in the chamber to 49 ℃, spray for 30 minutes, leave it for 90 minutes, 250 Cycles (500 hr), 500 cycle (1,000 hr) and 1000 cycle (2,000 hr) were tested.

NO. product Test result thickness After 250Cycle_500hr test After 500Cycle_1,000hr test After 1000Cycle_2,000hr test LEAK presence LEAK presence LEAK presence Example 1 1.6T No LEAKs No LEAKs LEAK Occurrence Example 2 No LEAKs No LEAKs No LEAKs Example 3 No LEAKs No LEAKs No LEAKs Example 4 No LEAKs No LEAKs No LEAKs Example 5 No LEAKs No LEAKs LEAK Occurrence Example 6 No LEAKs No LEAKs LEAK Occurrence Example 7 No LEAKs No LEAKs LEAK Occurrence Example 8 No LEAKs No LEAKs LEAK Occurrence Example 9 No LEAKs No LEAKs LEAK Occurrence Example 10 No LEAKs No LEAKs LEAK Occurrence Comparative Example 1 No LEAKs LEAK Occurrence LEAK Occurrence Comparative Example 2 No LEAKs LEAK Occurrence LEAK Occurrence Comparative Example 3 No LEAKs LEAK Occurrence LEAK Occurrence Comparative Example 4 No LEAKs LEAK Occurrence LEAK Occurrence Comparative Example 5 No LEAKs LEAK Occurrence LEAK Occurrence Example 1
1.8T No LEAKs No LEAKs No LEAKs Example 2 No LEAKs No LEAKs No LEAKs Example 3 No LEAKs No LEAKs No LEAKs Example 4 No LEAKs No LEAKs No LEAKs Example 5 No LEAKs No LEAKs No LEAKs Example 6 No LEAKs No LEAKs No LEAKs Example 7 No LEAKs No LEAKs No LEAKs Example 8 No LEAKs No LEAKs No LEAKs Example 9 No LEAKs No LEAKs No LEAKs Example 10 No LEAKs No LEAKs No LEAKs Comparative Example 1 No LEAKs No LEAKs LEAK Occurrence Comparative Example 2 No LEAKs No LEAKs LEAK Occurrence Comparative Example 3 No LEAKs No LEAKs LEAK Occurrence Comparative Example 4 No LEAKs LEAK Occurrence LEAK Occurrence Comparative Example 5 No LEAKs LEAK Occurrence LEAK Occurrence

As shown in Table 5, in the evaluation of corrosion resistance, LEAK showed good results without LEAK in both Examples and Comparative Examples in the evaluation after the 250Cycle_5000hr test. After the 500Cycle_1,000hr test, LEAK, which does not appear in Examples 1 to 10, was observed in Comparative Examples 1 to 5, respectively. In particular, in the case of the receiver dryer manufactured with a thickness of 1.6T, LEAK occurred in Comparative Examples 1 to 5. Therefore, the receiver dryer made of the aluminum alloy of Examples 1 to 10 according to the composition of the present invention does not cause LEAK at both 1.6T and 1.8T thickness in a 500Cycle_1,000hr salt water environment, so it has sufficient corrosion resistance to be used in the receiver dryer. Confirmed.

In addition, corrosion resistance was evaluated in a harsh environment of 1000Cycle_2,000hr. As a result of the experiment, it was confirmed that, in the case of Examples 2 to 4, LEAK did not occur even in a harsh environment of 1000Cycle_2,000hr in both 1.6T and 1.8T thicknesses, and thus excellent corrosion resistance properties were confirmed. In Examples 2 to 4, it was confirmed that Ti Cr and Zr had excellent corrosion resistance properties with a composition including the same amount in the range of 0.05 to 0.1%.

As described above, the receiver dryer for automobiles according to the present invention can be manufactured using an aluminum alloy with improved corrosion resistance in a salt water environment at the level of excellent tensile strength and yield strength.

In addition, the aluminum alloy may manufacture a pipe or a pipe structure applied to an automobile air conditioning line together with a vehicle receiver dryer. In the case of a pipe structure, it refers to a bolt or nut or other fastening means fastened to a pipeline to be fastened. The pipe structure may be manufactured by extrusion and drawing methods using the high corrosion resistance aluminum alloy of the present invention. The structure may be used as at least one of a refrigerant line, a coolant line, and a variable speed oil cooler line of a vehicle refrigerant transport system.

In addition, the high corrosion-resistance aluminum alloy according to the present invention can be used in a variety of ways to prevent corrosion, such as refrigerators, washing machines, home air conditioners, heat sinks such as LEDs, electrical appliances, roofing materials, chemical devices, kitchen appliances, and ship exterior materials.

The technical spirit of the present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is the technical spirit of the present invention that various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art to which this belongs.

10: receiver dryer 20: condenser
30: pipe 40: hose
50: compressor 60: hose
70: expansion valve 80: evaporator

Claims (6)

As wt%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn: 0.9 to 1.5%, Ti: 0.05 to 0.1 %, Cr: 0.05 to 0.1% and Zr: including all of 0.05 to 0.1%, manufacturing an aluminum billet consisting of the remaining Al and unavoidable impurities;
extruding and drawing the billet to produce an aluminum pipe; and
Forming and bending the left and right ends of the aluminum pipe to form a receiver dryer shape,
A method of manufacturing a receiver dryer for automobiles using a high corrosion-resistance aluminum alloy, characterized in that the corrosion resistance in a salt water environment is improved by including the Ti, Cr and Zr in the same ratio in the thickness of the receiver dryer is 1.6mm or less.
delete delete delete delete As wt%, Cu: 0.1% or less (excluding 0%), Si: 0.15% or less (excluding 0%), Fe: 0.2% or less (excluding 0%), Mn: 0.9 to 1.5%, Ti: 0.05 to 0.1 %, Cr: 0.05 to 0.1% and Zr: In the receiver dryer for automobiles made of an aluminum alloy consisting of the remaining Al and unavoidable impurities, including all of 0.05 to 0.1%,
Receiver dryer for automobiles, characterized in that the corrosion resistance in a salt water environment is improved by including the Ti, Cr and Zr in the same ratio in the thickness of the receiver dryer for automobiles of 1.6T or less

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