KR101355424B1 - Manufacturing method for aluminum alloy having recess and protrusion undercut - Google Patents

Abstract

The present invention relates to an integrated aluminum resin composite structure of different materials and a method of manufacturing the same. According to the present invention, after inserting a structure of an aluminum alloy covered with a square groove and a protrusion into an injection mold, the resin composition is injected into the injection mold, whereby a bonding state due to the integration of the dissimilar material aluminum alloy material and the resin material is obtained. Low cost resins that can be kept strong, simplify manufacturing processes, provide low maintenance standards, generalized low cost chemicals, and improved tensile strength, while improving the constraints of resin materials used when using conventional bonding techniques By making it possible to reuse, the possibility of application in the industrial sector is increased.

Description

A method for producing an aluminum alloy having grooves and protrusion undercuts. {MANUFACTURING METHOD FOR ALUMINUM ALLOY HAVING RECESS AND PROTRUSION UNDERCUT}

The present invention relates to an aluminum resin composite structure used for cases, structural parts, mechanical parts, etc. of electronic devices and home appliances, and more particularly, by integrating a resin of different materials into an aluminum alloy structure made by various machining processes, Aluminum alloys with grooves and protrusions undercuts to provide lightweight composite structures for use in electronics, home appliances, medical devices, structural parts for vehicles, vehicle mountings, building materials, and other structural and exterior parts Manufacturing method. .

The technology of integrating dissimilar aluminum alloys and resins with adhesives is required from a wide range of industries and technical fields, such as automobiles, home electronics, and industrial equipment. Therefore, many adhesives, adhesive tapes, fusion technologies, and bonding technologies are required. Plastics and the like have been developed.

Some of the adhesives developed above have excellent adhesive performance, and these adhesives have been used for bonding integrating aluminum alloys and resins while exhibiting adhesive functions by normal temperature or heating. , Cell phones, laptops.

On the other hand, conventionally, a method of joining a dissimilar aluminum alloy material and a resin material without using an adhesive has been studied. Among them, one of the nano-methods is currently being actively studied.

The joining technique of dissimilar materials by the nano method is to insert a resin material by making a nano-sized hole in the surface of the aluminum alloy material.

However, the above insert technology has the advantage of higher tensile strength than adhesives, while the management criteria for material selection are strict, the processing is complicated, the unit price is high, and the use of high-risk chemicals increases the production cost due to the large amount of waste water. There are disadvantages.

That is, the conventional insert method according to the nano method has to insert a resin material into a nano-sized hole. In this case, in order to increase the penetration performance of the resin material, a specific resin material must be used.

The present invention is to improve the conventional problems as described above, by inserting the aluminum alloy structure covered with the square micro grooves and protrusions into the molding die, and then insert-injecting the resin composition into the molding mold, the aluminum alloy material of different materials To maintain the bonding state due to the integration of the resin material and the resin material, as well as to simplify the manufacturing process, lower management standards, generalized low-cost chemicals, and improved tensile strength, The present invention provides a method for producing an aluminum alloy suitable for manufacturing an integrated composite structure of heterogeneous materials that can be used in an inexpensive resin material while improving the use of low cost resin materials while improving the problem of using a resin material.

delete

In order to achieve the above object, the integrated aluminum resin composite structure of the heterogeneous material of the present invention has a length of an average right angle of 1 to 10 by microscopic observation through a process of etching aluminum with at least one aqueous solution selected from hydrochloric acid, sulfuric acid, and nitric acid compounds. An aluminum alloy portion having a square groove portion and a protrusion undercut having a thickness of µm, and a resin material which is fixed by injection molding on the surface of the aluminum alloy portion.

In addition, the manufacturing method of the aluminum resin composite structure, the step of washing the aluminum surface and removing the oxide film on the aluminum surface by dipping in an aqueous sodium hydroxide solution; Etching aluminum with at least one aqueous solution selected from hydrochloric acid, sulfuric acid, and nitric acid to form an aluminum alloy portion having a rectangular groove portion and a protrusion undercut having an average right angle of 1 to 10 μm in length; And injecting the aluminum alloy portion subjected to the etching process into the injection molding die, and then injection-bonding the resin material to the surface of the aluminum alloy portion.

Moreover, the method of manufacturing the aluminum alloy in which the groove part and protrusion part undercut of 1-10 micrometers of average right angle length of this invention were formed is provided,

Shaping the aluminum alloy by die casting or machining;

A degreasing step of removing the oil component adhered in the shaping step by using a surfactant;

Immersing the aluminum alloy in which the degreasing step is completed in an aqueous alkaline solution at a concentration of 10 to 100 g / l to remove organic, inorganic foreign matter and aluminum oxide film and to surface-activate it;

In the immersion step, the foreign matter and aluminum oxide film is removed, and the surface-activated aluminum alloy parts are etched with an acid aqueous solution having a concentration of 100 to 300 ml / l of at least one selected from hydrochloric acid, sulfuric acid, and nitric acid.

The aluminum alloy may be selected from Al-Mg alloys, Al-Mn alloys, Al-Mg-Mn alloys, Al-Cu-Mg alloys, Al-Zn-Mg alloys, and Al-Mg-Si alloys. Can be. In addition, the aluminum alloy is preferably an alloy of a non-heat treatment type to increase the hardness and tensile strength by hardening after machining, or a heat treatment type alloy to improve mechanical properties by heat treatment.

It is preferable that the said immersion process is performed on the temperature of 40-60 degreeC, and the time 30 second-2 minutes conditions, and the etching process is performed on the conditions of the temperature of 50-70 degreeC and time 2 minutes-4 minutes.

As described above, the present invention inserts an aluminum alloy structure covered with a micro groove and a protrusion having a size of 1 to 10 μm into an injection molding mold, and then insert-injects a resin composition into the injection molding mold, thereby dispersing the aluminum alloy material as a heterogeneous material. It enables to maintain the strong bonding state due to the integration of the resin material, simplifies the manufacturing process, low control standards, generalized low-cost chemicals, and improved tensile strength.

In addition, it is possible to expect the effect of increasing the possibility of use in the industrial field by enabling the use of inexpensive resin materials while improving the constraints of the use of the resin material occurs when using the conventional bonding method by the nano method.

1 is an enlarged photograph showing a three-dimensional staircase shape in a square groove by observing at 3000 magnification through an electron microscope after coating the surface of an aluminum alloy with platinum so as to see the embodiment of the present invention.
Figure 2 is an enlarged photograph observed at 100,000 magnification through an electron microscope after coating with platinum so that the aluminum surface can be seen as an embodiment of the present invention.
FIG. 3 is an enlarged photograph of an embodiment of the present invention, in which a product is molded (plastic) and then polished (cut off) with a fine sandpaper, and observed at 1000 magnification through an electron microscope in order to see a cross section of the joint surface.
4A and 4B are cross-sectional schematic diagrams illustrating a bonding state between an aluminum alloy as an aluminum alloy part and a polyamide-based resin as a resin material according to an embodiment of the present invention.
FIG. 5 is a test report of a tensile force measuring tester for a composite structure integrated by joining an aluminum alloy and a polyamide-based resin according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is an enlarged photograph showing a three-dimensional stepped shape in a square groove by observing at 3000 magnification through an electron microscope after coating the surface of an aluminum alloy with platinum in an embodiment of the present invention. An embodiment of the present invention is an enlarged photograph observed at 100,000 magnification through an electron microscope after coating the aluminum surface to be seen well, Figure 3 is an embodiment of the present invention to see the cross section of the joint surface After molding, the sections were polished with fine sandpaper, and then magnified at 1000 magnification by an electron microscope.

[Aluminum alloy part]

As shown in Figures 1 to 3, the aluminum alloy used in the present invention is an aluminum alloy made by machining, such aluminum alloy is a non-heat treatment alloy to increase the hardness and tensile strength only by curing after machining, It can also be distinguished as a heat treatment alloy which improves mechanical properties by heat treatment.

That is, the aluminum alloy belonging to the above non-heat treatment alloy includes Al-Mg alloy, Al-Mn alloy, Al-Mg-Mn alloy, and the like, and the aluminum alloy belonging to the heat treatment alloy is Al-Cu-Mg. Alloys, Al-Zn-Mg alloys, Al-Mg-Si alloys, heat-resistant aluminum alloys, and the like.

Thus, various kinds of aluminum alloys to be applied to the embodiment of the present invention are known, and are standardized as A (X) 1000 to A (X) 7000 series of the Korean Industrial Standard (KSD).

The aluminum alloy applied to the embodiment of the present invention is obtained from an intermediate aluminum material such as a plate-like material, a rod shape, and a pipe-shaped extruded product as a shape of a material before processing, which is processed, such as cutting, cutting, drawing, etc. It is processed into a part structure by machining such as milling, electric discharge, press, grinding, and polishing.

Therefore, the part structure is processed into a part having a shape and a structure required for a specific product while being injected into the injection mold.

At this time, the aluminum alloy parts manufactured and processed as described above need not be formed with a thick oxide film, a hydroxide film, or the like to be bonded. It is necessary to perform a process of removing the surface by blast processing or the like. Dirty things other than rust, that is, an oil layer on the surface adhered in the aluminum processing process, a finger grease adhered by transport, and the like are removed by the degreasing process described below.

[Resin]

The resin material may be a polyamide resin, or a thermoplastic synthetic resin composition having a resin powder composition containing two or more polyamides selected from the group of different polyamide resins as a main component. In this case, two or more types of polyamides may be simply mixed or molecularly bonded. When using a simple mixture, two or more kinds may be used as a main component from polyamide resin.

On the other hand, the composite structure according to the embodiment of the present invention is a filler with respect to a total of 100 parts by mass of the resin powder for the purpose of adjusting the difference in linear expansion coefficient between the aluminum alloy component and the resin composition component, and to improve the mechanical strength of the resin composition component. (filler) It can also be comprised by the resin composition component which further contains 1-200 mass parts, More preferably, 10-150 mass parts.

As said filler, fillers, such as a fibrous filler, a granular filler, a plate-shaped filler, are mentioned, As said fibrous filler, glass fiber, carbon fiber, aramid fiber, etc. are mentioned, for example, As a specific example of glass fiber, And chopped strands having an average fiber diameter of 6 to 14 µm. Moreover, as said plate-shaped and granular filler, the pulverized material of calcium carbonate, mica, glass flake, glass balloon, magnesium carbonate, silica, talc, clay, carbon fiber or aramid fiber, for example Etc. can be mentioned.

Even when no filler is included, very strong force is required to adhere firmly and to remove the resin molding adhered to aluminum. However, when the molded composite structure is subjected to a temperature cycle test, the adhesive strength rapidly decreases by repeating the cycle in the resin system containing no filler.

There are two causes for this, one of which is because there is a large difference in the aluminum shape and the thermoplastic synthetic resin composition in the linear expansion coefficient. For example, the coefficient of linear expansion of aluminum alloys is larger among aluminum, but is still considerably smaller than that of thermoplastic synthetic resins. The presence of a filler lowers the coefficient of linear expansion of the thermoplastic synthetic resin composition, and approximates the coefficient of linear expansion of the aluminum alloy to about 2.5 × 10 ⁻⁵ ° C. ⁻¹ .

When the type of filler and its content rate are selected, the linear expansion rate of the resin can be set to a value close to an aluminum alloy or the like. For example, when 40 to 50% of glass fiber is included in nylon 66, the linear expansion rate is 2 to 3 x 10 ^-5 ° C. Go down to ^-1 .

Another one is the relationship between the cooling shrinkage of the aluminum-shaped object after insert molding, and the molding shrinkage of a thermoplastic synthetic resin composition. Molding shrinkage of nylon 66 without filler is 0.6-2.5%. On the other hand, the cooling shrinkage of the aluminum alloy, for example, cooling down to 100 ° C from the time of injection to room temperature, the difference of about 0.2% is much smaller than the molding shrinkage of the resin. When the mold is released from the injection molding mold and time elapses and the shrinkage of the resin proceeds, internal distortion occurs at the interface, and the interface fracture occurs due to a slight impact, resulting in peeling. When 40 to 50% of glass fibers are mixed with nylon 66, the shrinkage rate of the molding decreases to about 0.4 to 0.6%. This also is considerably larger than the shrinkage of the aluminum alloy, and even in the case of joining, a large internal distortion remains on the joining surface.

Therefore, such a large amount of filler content does not give sufficient satisfaction with regard to molding shrinkage. Therefore, it is necessary as a design to first injection-bond an aluminum alloy and a polyamide resin composition in a form in which large internal distortion is hard to remain on the joining surface. However, there is a need for a method of specifically confirming whether or not the design result was suitable for use as a product. The method is surprisingly simple. In other words, when the injection bonding is performed and left for several days, and then broken and exhibited a satisfactory strength, the bonding strength can be said to be competing against the force to break due to internal distortion.

Such heterogeneous composite structures are annealed at 60 to 70 ° C. × 1 to 2 hours within a few days after injection bonding to soften the resin to eliminate internal warping. When the annealing treatment of the integrated composite structure is carried out and the expected strength is obtained, the design is successful, and the strength is long even if there is expansion due to swelling of the resin part due to water absorption of the polyamide resin.

[Pretreatment Step]

Hereinafter, the pretreatment process with respect to the aluminum alloy which is an aluminum alloy part is demonstrated.

In general, the surface of the processed aluminum alloy is foreign matter and oil, and the foreign matter and oil should be removed. At this time, the removal of foreign substances and oil may be used as a pretreatment process, neutral detergent, ultrasonic degreasing, electrolytic degreasing except acid or basic chemicals.

The neutral detergent may be a commercially available cleaning agent for aluminum alloys, but may also be used as a kitchen detergent (product containing a surfactant) used in the general home.

When using the dishwashing detergent it is good to remove the dishwashing detergent component, because if the dishwashing detergent components remain because it may be disturbed in the reaction to the treatment.

[Main treatment process]

Hereinafter, the main treatment step for the aluminum alloy after the pretreatment step will be described.

The aluminum alloy whose surface was washed from the pretreatment step is subjected to main treatment with caustic soda and hydrochloric acid.

The function of caustic soda is to help the hydrochloric acid react evenly by removing the protective film such as the oxide film on the surface of the aluminum alloy. If an oxide film or the like is formed on the aluminum alloy surface, it must enter hydrochloric acid to destroy the oxide film and cause a reaction. Because it takes a lot of time and the reaction does not occur evenly.

Accordingly, after the caustic soda is immersed in an aqueous solution of caustic soda in a state in which an aqueous solution of 1 to 5% is prepared, preferably a suitable time, such as a temperature of 40 to 60 ° C., a time of 30 seconds to 2 minutes, Maintaining the temperature can destroy the oxide film.

That is, as the surface of the aluminum alloy immersed in the aqueous solution of caustic solubilizes, an oxide film breakage phenomenon occurs.

After that, the solution is etched for about 1 to 5 minutes at a temperature of 50 to 80 ° C. with an acid aqueous solution of 20 to 30% hydrochloric acid, sulfuric acid, or nitric acid, washed with tap water to drop the acid content, and quickly removes water. As a result of observing at a constant magnification (3000 magnification, 100,000 magnification, 1000 magnification) through an electron microscope, as shown in FIGS. It is confirmed that it is covered, which is also confirmed by eyes, and if treated properly, a uniform surface can be seen.

Next, when the aluminum alloy is molded and polished and the cross section is observed under a microscope (1000 magnification), as shown in FIG. 3, groove undercut portions of 1 to 10 μm and an average right angle of 5 μm appear, and the groove undercut portions are shown. The polyamide-based resin, which is a resin material, may penetrate and adhere to the resin.

In this case, when the injection of the resin material is performed in a state in which the treatment is not properly performed, the tensile strength of the composite structure is low, which is different from that of the proper treatment. There is a problem that the thickness of the structure itself is reduced and the aging of the treatment liquid is accelerated.

[Molding / injection molding]

The injection mold is prepared, the upper mold (movable mold) is opened, the machined aluminum alloy component structure is put into the lower mold (fixed mold), and the upper mold is closed.

Then, when the polyamide-based resin is a resin material is injected into the mold, it is possible to obtain a composite structure in which the aluminum alloy of the dissimilar material and the polyamide-based resin of the resin material are bonded.

At this time, the conditions of the thermoplastic synthetic resin composition during the injection molding as described above were to be made to the injection molding temperature as the temperature applied to the mold temperature, injection temperature, and the usual resin material injection temperature.

That is, the higher the mold temperature and the injection temperature, the better the result is obtained, but not excessively raised, and sufficient bonding effect can be exhibited under the same conditions as in the case of the normal injection molding using the thermoplastic synthetic resin composition.

In order to increase the bonding force, it is effective to raise the mold temperature slightly rather than when molding a conventional resin material. Accordingly, when the mold temperature is a resin molding reference condition, the bonding force is stabilized, and therefore, the injection molding mold should be used at such a high temperature. You will have to make it on the premise.

Hereinafter, preferred embodiments of the present invention will be described in detail.

Example 1

A commercially available 1.0 mm thick A5052 aluminum alloy plate was purchased and cut into a number of rectangular pieces of 14 mm x 50 mm.

After drilling a hole having a diameter of 6 mm φ at the end of the cut aluminum alloy piece by using a press, a jig made of titanium wire was prepared, and 10 pieces of cut aluminum alloy pieces were placed on a jig made of titanium wire so as not to bump each other. .

Next, the cut aluminum alloy pieces were immersed in a primary washing tank containing a general washing liquid (for example, kitchen detergent) sold in the market, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about 1 minute. First wash.

Next, a 5% caustic soda aqueous solution was prepared in a secondary washing tank, and the liquid temperature was 50 ° C., and the aluminum alloy piece having the primary washing was immersed therein for 3 minutes and washed with water.

Next, a 20% aqueous hydrochloric acid solution was prepared in a tertiary washing tank, and the liquid temperature was 60 ° C. Here, the secondary washed aluminum alloy piece was immersed for 3 minutes and washed, while the washed aluminum alloy piece was washed with a general hair dryer. Dried.

Next, after removing the aluminum alloy piece from the jig and storing it in a poly bag and observing it at 1000 magnification through an electron microscope the next day, it can be confirmed that the entire surface of the surface is covered with a square groove having a diameter of 1 to 10 μm. there was.

After 2 days after storing the aluminum alloy piece, the aluminum alloy piece was taken out and inserted into an injection molding mold. Through the movable mold and the fixed mold of the injection molding mold, as shown in FIGS. 4A and 4B, an aluminum alloy piece (1.0 mm × 50.0 mm × 14.0 mm) (1), a resin part (3 mm × 47 mm × 14 mm) (2), and bonding It had a surface (7mm x 8mm) (3), the area of the joining surface was 0.56 cm <2>, the mold was closed, the nylon resin composition was injected, and the composite structure which integrated the aluminum alloy and polyamide-type resin was obtained.

Injection resin temperature was 300 degreeC, and mold temperature was 130 degreeC. After two days, all ten samples were subjected to tensile failure testing with a tensile tester. In this test, shear failure force can be measured. As a result, the average shear breaking force was 271 kgf / cm 2.

<Test 1>

The composite structure of Example 1 was recreated and subjected to a reliability test thermal shock, and the conditions were -40 ° C. to + 80 ° C. for 1 hour, and the shear fracture force of 280 kgf / cm 2 in the 118-hour test, and 271 kgf in the 202-hour test. Shear failure force of / cm 2, shear failure force of 275 kgf / cm 2 in the 300 hours test (test test report of Figure 5), it was found that there is little change in the tensile force even under severe conditions.

<Test 2>

In order to prevent the aluminum alloy from bending with the composite structure of Example 1, the same aluminum alloy specimen was attached with a commercially available strong bond opposite the joint surface and tested again.

As a result, the average shear breaking force was 337 kgf / ㎠, and it was found that the tensile strength weakened as the aluminum alloy was not able to withstand the strong bonding force during the test and was bent.

<Test 3>

Using a product that prevents aluminum alloy from bending, general surface hardening anodizing (coloring and oxidizing layer on aluminum alloy surface) resulted in an average shear breaking force of 353 kgf / ㎠ and a maximum tensile force of 377 kgf / ㎠. (Refer to the test test report of Figure 5), which is that the aluminum alloy is harder due to the erosion of the joint and the surface hardening that generally occurs, the good results were obtained.

Example 2

A commercially available 1.0 mm thick A5052 aluminum alloy plate was purchased. Many cut | disconnected the rectangular piece of 14 mm x 50 mm.

After drilling a hole having a diameter of 6 mm phi at the end of the cut aluminum alloy piece with a press, a jig made of titanium wire is prepared, and 10 pieces of cut aluminum alloy pieces are placed on the jig so as not to touch each other.

Next, the cut aluminum alloy pieces were immersed in a primary washing tank containing a general washing liquid (for example, pong pong) sold in the market, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about 1 minute. Primary wash.

Next, a 5% caustic soda aqueous solution was prepared in a secondary washing bath, and the liquid temperature was 50 ° C., and the aluminum alloy piece having the primary washing was immersed therein for 2 minutes and washed with water.

Next, a 20% aqueous hydrochloric acid solution was prepared in a third washing bath, and the liquid temperature was 60 ° C., and the second washed aluminum alloy piece was immersed for three minutes and washed with water, while the washed aluminum alloy piece was dried with a general hair dryer. Dries

Next, the aluminum alloy piece was taken out of the jig and stored in a poly bag, and after 2 days, the alloy piece was taken out and inserted into an injection molding mold. Through the movable mold and the fixed mold of the injection molding mold, as shown in FIGS. 4A and 4B, an aluminum alloy piece (1.0 mm × 50.0 mm × 14.0 mm) (1), a resin part (3 mm × 47 mm × 14 mm) (2), and a bonding surface ( 7 mm x 8 mm) (2), and the bonding surface area was 0.56 cm 2. The mold was closed and the nylon resin composition was injected to obtain an integrated product.

Injection temperature was 300 degreeC, and mold temperature was 130 degreeC. After two days, all ten samples were subjected to tensile failure testing with a tensile tester. In this test, shear failure force can be measured. As a result, the average shear breaking force was 278 kgf / cm 2.

Example 3

A commercially available 1.0 mm thick A5052 aluminum alloy plate was purchased. Many cut | disconnected the rectangular piece of 14 mm x 50 mm.

After drilling a hole having a diameter of 6 mm phi at the end of the cut aluminum alloy piece with a press, a jig made of titanium wire is prepared, and 10 pieces of cut aluminum alloy pieces are placed on the jig so as not to touch each other.

Next, the cut aluminum alloy pieces were immersed in a primary washing tank containing a general washing liquid (for example, pong pong) sold in the market, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about 1 minute. Primary wash.

Next, a 5% caustic soda aqueous solution was prepared in a secondary washing tank, and the liquid temperature was 60 ° C., and the aluminum alloy piece having the primary washing was immersed therein for 1 minute and washed with water.

Next, a 20% hydrochloric acid aqueous solution was prepared in a third washing bath, and the liquid temperature was 60 ° C., and the second washed aluminum alloy piece was immersed for two minutes and washed with water, while the washed aluminum alloy piece was dried with a general hair dryer. Dries

Next, the aluminum alloy piece was taken out of the jig and stored in a poly bag, and after 2 days, the alloy piece was taken out and inserted into an injection molding mold. Through the movable mold and the fixed mold of the injection molding mold, as shown in FIGS. 4A and 4B, an aluminum alloy piece (1.0 mm × 50.0 mm × 14.0 mm) (1), a resin part (3 mm × 47 mm × 14 mm) (2), and a bonding surface ( 7 mm x 8 mm) (3), and the bonding surface area was 0.56 cm 2. The mold was closed and the nylon resin composition was injected to obtain an integrated product.

Injection temperature was 300 degreeC, and mold temperature was 130 degreeC. After two days, all ten samples were subjected to tensile failure testing with a tensile tester. In this test, shear failure force can be measured. As a result, the average shear breaking force was 270 kgf / cm 2.

Example 4

A commercially available 1.0 mm thick A5052 aluminum alloy plate was purchased. Many cut | disconnected the rectangular piece of 14 mm x 50 mm.

After drilling a hole having a diameter of 6 mm phi at the end of the cut aluminum alloy piece with a press, a jig made of titanium wire is prepared, and 10 pieces of cut aluminum alloy pieces are placed on the jig so as not to touch each other.

Next, the cut aluminum alloy pieces were immersed in a primary washing tank containing a general washing liquid (for example, pong pong) sold in the market, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about 1 minute. Primary wash.

Next, a 5% caustic soda aqueous solution was prepared in a secondary washing tank, and the liquid temperature was 70 ° C., after which the aluminum alloy piece having the primary washing was immersed for 1 minute and washed with water.

Next, a 20% hydrochloric acid aqueous solution was prepared in a third washing tank, and the liquid temperature was 70 ° C., and the second washed aluminum alloy piece was immersed for two minutes and washed with water, while the washed aluminum alloy piece was dried with a general hair dryer. Dries

Next, the aluminum alloy piece was taken out of the jig and stored in a poly bag, and after 2 days, the alloy piece was taken out and inserted into an injection molding mold. Through the movable mold and the fixed mold of the injection molding mold, as shown in FIGS. 4A and 4B, an aluminum alloy piece (1.0 mm × 50.0 mm × 14.0 mm) (1), a resin part (3 mm × 47 mm × 14 mm) (2), and a bonding surface ( 7 mm x 8 mm) (3), and the bonding surface area was 0.56 cm 2. The mold was closed and the nylon resin composition was injected to obtain an integrated product.

Injection temperature was 300 degreeC, and mold temperature was 130 degreeC. After two days, all ten samples were subjected to tensile failure testing with a tensile tester. In this test, shear failure force can be measured. As a result, the average shear breaking force was 253 kgf / cm 2.

Example 5

A commercially available 1.0 mm thick A5052 aluminum alloy plate was purchased. Many cut | disconnected the rectangular piece of 14 mm x 50 mm.

After drilling a hole having a diameter of 6 mm phi at the end of the cut aluminum alloy piece with a press, a jig made of titanium wire is prepared, and 10 pieces of cut aluminum alloy pieces are placed on the jig so as not to touch each other.

Next, the cut aluminum alloy pieces were immersed in a primary washing tank containing a general washing liquid (for example, pong pong) sold in the market, and the aluminum alloy pieces were immersed in the washing liquid of the primary washing tank for about 1 minute. Primary wash.

Next, a 5% caustic soda aqueous solution was prepared in a secondary washing tank, and the liquid temperature was 70 ° C., after which the aluminum alloy piece having the primary washing was immersed for 1 minute and washed with water.

Next, a 20% hydrochloric acid aqueous solution was prepared in a third washing tank, and the liquid temperature was 70 ° C., and the second washed aluminum alloy piece was immersed for 1 minute and washed with water, while the washed aluminum alloy piece was dried with a general hair dryer. Dries

Next, the aluminum alloy piece was taken out of the jig and stored in a poly bag, and after 2 days, the alloy piece was taken out and inserted into an injection mold. Through the movable mold and the fixed mold of the injection molding mold, as shown in FIGS. 4A and 4B, an aluminum alloy piece (1.0 mm × 50.0 mm × 14.0 mm) (1), a resin part (3 mm × 47 mm × 14 mm) (2), and a bonding surface ( 7 mm x 8 mm) (3), and the bonding surface area was 0.56 cm 2. The mold was closed and the nylon resin composition was injected to obtain an integrated product.

Injection temperature was 300 degreeC, and mold temperature was 130 degreeC. After two days, all ten samples were subjected to tensile failure testing with a tensile tester. In this test, shear failure force can be measured. As a result, the average shear breaking force was 266 kgf / cm 2.

Hereinafter, the present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to be within the scope of the claims.

One ; Aluminum alloy 2; Resin
3; Joint surface

Claims (5)

Shaping the aluminum alloy by die casting or machining;
A degreasing step of removing the oil component adhered in the shaping step by using a surfactant;
In order to remove the organic, inorganic foreign matter and aluminum oxide film and surface-activate the aluminum alloy in which the degreasing step is completed, the aluminum alloy is immersed in an alkaline aqueous solution having a concentration of 10 to 100 g / l, and the temperature is 40 to 60 ° C. for a time of 30 seconds to Immersing the aluminum alloy in an aqueous alkaline solution at 2 minutes;
In the immersion process, foreign matter and aluminum oxide film is removed, and the surface-activated aluminum alloy is etched with an acid aqueous solution having a concentration of 100 to 300 ml / l of at least one selected from hydrochloric acid, sulfuric acid, and nitric acid, at a temperature of 50 to 80 ° C. An etching step of etching under conditions of 1 to 5 minutes to form grooves and protrusions having an average right angle of 1 to 10 탆 in length,
A method for producing an aluminum alloy having grooves and protrusion undercuts. The aluminum alloy of claim 1, wherein the aluminum alloy is an Al-Mg alloy, an Al-Mn alloy, an Al-Mg-Mn alloy, an Al-Cu-Mg alloy, an Al-Zn-Mg alloy, or an Al-Mg- alloy. Characterized in that the Si-based alloy,
A method for producing an aluminum alloy having grooves and protrusion undercuts. The method of claim 2, wherein the aluminum alloy is a non-heat treatment alloy to increase the hardness, tensile strength by hardening after machining, or a heat treatment type alloy to improve the mechanical properties by heat treatment,
A method for producing an aluminum alloy having grooves and protrusion undercuts. delete delete

Images