KR101638699B1 - Composition for chemically polishing alluminium after deep-drawing process and the process for chemically polishing the surface of alluminium thereby - Google Patents

Abstract

The present invention relates to a chemical polishing composition for use in an aluminum-deep-drawing process, and a chemical polishing method for aluminum using the same. More particularly, the present invention relates to a chemical polishing composition for aluminum polishing, The present invention relates to a chemical polishing method of aluminum which improves metal luster and reduces average roughness by polishing the surface of aluminum to improve the problem.

Description

TECHNICAL FIELD The present invention relates to a chemical polishing composition for use in an aluminum-deep-drawing process, and a chemical polishing method for aluminum using the same.

The present invention relates to a chemical polishing composition for use in an aluminum-deep-drawing process, and a chemical polishing method for aluminum using the same. More particularly, the present invention relates to a chemical polishing composition for aluminum polishing, To a chemical polishing method of aluminum capable of forming an oxide film as well as improving metal luster by polishing the surface of aluminum to improve the problem.

In order to reduce the weight, the battery case used in a cell phone, a PC, etc. is processed by deep-drawing molding using general purpose aluminum excellent in strength, formability and weldability.

In general, deep drawing corresponds to a drawing process in which a wall of a workpiece is thinned by a press using a punch and a mold. The deep drawing can be used for processing various metal plates such as stainless steel in addition to aluminum, and is widely used in a process for manufacturing various types of workpieces such as a rifle bullet, a casket, an aluminum jug, and a bucket.

For example, Patent Document 1 proposes a sandwich panel core material which can easily cut and bend the sandwich panel when the sandwich panel is to be bent so as to be applied to a curved portion of a building, and a sandwich panel using the core material More specifically, any one metal plate selected from aluminum plates, tinned steel plates, zinc-coated steel sheets, and stainless steel plates is pressed by deep drawing using a drawing die, Discloses a deep drawing core for a sandwich panel in which any one depressed portion selected from among various depressions of a horn-like type is formed so as to face only below a metal plate, or alternately formed so as to face alternately below and above the metal plate.

Patent Document 2 relates to a soft hot-rolled steel sheet excellent in deep drawability and a method of manufacturing the same, in which not only a high r value is ensured in the hot rolling step, the deviation of the r value from the surface portion is reduced through lubrication rolling, By adding titanium (Ti), niobium (Nb), and molybdenum (Mo), it is possible to obtain excellent characteristics of elongation and r value by sufficiently controlling the solid elements in the steel. Thus, a soft hot- And the like.

The deep drawing technique will be described in detail as follows. First, the plate (aluminum) is placed on the mold, and then the punch and the stopper are lowered to the upper surface of the plate.

When the punch and the stopper are lowered as described above, the stopper fixes the outside of the plate member, and the inside thereof pushes the plate member to the hollow portion of the mold by the lowering of the punch.

Therefore, the plate material is lowered to the lower side of the hollow portion to increase the material. At this time, since the plate material is not completely fixed to the plate material, the plate material is also guided to the hollow portion side so that the plate material is not torn or wrinkled.

When the deep drawing operation is completed by the above-described series of operation procedures, a deep cap having a predetermined shape is completed. However, the product manufactured by the conventional deep drawing operation is pushed to the hollow portion by the punch, The surface is very rough and a manhole is generated.

Therefore, the post-treatment process requires a surface treatment process for grinding the inner surface and the surface of the product, and a surface treatment process for softening the rough surface and polishing the surface of the plate (aluminum) There is a problem that it is necessary to carry out a polishing process which can be performed.

Korean Patent No. 10-0666845 (Published on September 23, 2005) Korean Patent Publication No. 10-2010-0035824 (Published on April 07, 2010)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a chemical polishing composition capable of not only improving the luster of metal by polishing the surface of aluminum but also forming an oxide film, And to provide a surface treatment method.

To this end, the present invention is characterized by comprising 1 to 10 parts by weight of nitric acid (HNO ₃ ) and 10 to 50 parts by weight of water (H ₂ O) based on 100 parts by weight of phosphoric acid (H ₃ PO ₄ ) There is provided a composition for chemical polishing for processing after a drawing process.

In a preferred embodiment of the invention, the chemical polishing composition of the aluminum phosphate (H ₃ PO ₄₎ with respect to 100 parts by weight of sulfuric acid _{(H 2 SO 4) 5 ~} 10 parts by weight of boric acid (H ₃ BO ₃ ) May be further included.

Another aspect of the present invention is a method for manufacturing a deep-drawn aluminum molding, comprising the steps of: (1) forming a deep drawn aluminum alloy by deep drawing; And two steps of impregnating the aluminum moldings with the composition and then chemically polishing at a temperature of 70 ° C to 110 ° C. The present invention also provides a chemical polishing method for the post-deep-drawing treatment of aluminum.

In a preferred embodiment of the present invention, the polishing in step 2 may be performed for 3 to 5 minutes.

Another aspect of the present invention is a method for manufacturing a deep drawn aluminum mold, comprising the steps of: (1) forming an aluminum mold by deep drawing an aluminum alloy; And two steps of impregnating the aluminum moldings with the composition and then chemically polishing at 85 ° C to 105 ° C. There is provided a chemical polishing method for a post-deep-drawing treatment of aluminum.

In a preferred embodiment of the present invention, the polishing in the step 2 may be performed for 2 to 5 minutes.

In one preferred embodiment of the present invention, the aluminum ingot may include at least one aluminum alloy selected from the group consisting of AL8079, 1N30, AL8021, AL3003, AL3004, AL3005, AL3104 and AL3105.

In a preferred embodiment of the present invention, the aluminum ingot may include an aluminum alloy of AL 3003.

Another aspect of the present invention provides an aluminum product which is polished by the above method and has an average surface roughness (Ra) of 10 to 70 nm.

In a preferred embodiment of the present invention, the aluminum product may be a battery case.

According to the present invention, by providing a chemical polishing composition for polishing an uneven surface that may occur after the deep drawing process and a chemical polishing method of aluminum using the same, an oxide film can be formed as well as a metallic luster can be formed, An improved aluminum alloy can be produced.

1 is a low-magnification photograph of the surface of Example 1 according to the present invention.
2 is a low magnification photograph of the surface of Comparative Examples 1 to 3 observed.
3 is a high-magnification photograph showing the surface of Example 1 according to the present invention.
4 is a high magnification photograph of the surface of Comparative Examples 1 to 3 observed.

In the present specification, the term "surface roughness" refers to a numerical value represented by a representative value obtained by averaging measurement values randomly extracted from a certain surface, as a degree of small irregularities on the surface of an object.

As described above, friction occurs between the die and the product in the deep drawing forming as described above, so that the aluminum material subjected to the deep drawing forming loses its gloss and causes the interface to be formed, and a wavy pattern or the like appears at the interface, There is a problem that it acts as a cause of surface generation.

Accordingly, in the present invention, by providing a composition for chemical polishing for the post-aluminum-deep drawing process, not only the surface metal luster is improved but also the uneven surface is uniformly improved to solve the above-mentioned problems. Hereinafter, the present invention will be described in more detail.

The chemical polishing composition for treatment after the aluminum-deep-drawing process according to the present invention comprises phosphoric acid (H ₃ PO ₄ ), nitric acid (HNO ₃ ) and water (H ₂ O). The phosphoric acid and nitric acid oxidize aluminum to chemically polish the surface to perform a main reaction.

In addition, the chemical polishing composition for treatment after the aluminum-deep-drawing process according to the present invention may further include sulfuric acid (H ₂ SO ₄ ) and boric acid (H ₃ BO ₃ ). The sulfuric acid serves to accelerate the reaction of polishing the aluminum with phosphoric acid and nitric acid, the boric acid serves to secondarily polish the aluminum, and water is introduced to adjust the concentration of the composition for chemical polishing of aluminum. The main reaction occurring at this time is shown in the following reaction formula 1.

[Reaction Scheme 1]

7Al + 7H ₃ PO ₄ + 5HNO ₃ ? 7AlPO ₄ + 2N ₂ + NO ₂ + 13H ₂ O

Aluminum according to the invention the chemical polishing composition for the treatment after the deep-drawing process is phosphoric acid (H ₃ PO ₄₎ with respect to 100 parts by weight of nitric acid (HNO ₃₎ 1 ~ 10 parts by weight, and water (H ₂ O) 10 Preferably from 1 to 5 parts by weight of nitric acid (HNO ₃ ) and from 30 to 50 parts by weight of water (H ₂ O), based on 100 parts by weight of phosphoric acid (H ₃ PO ₄ ) have. If the amount of nitric acid is less than 1 part by weight based on 100 parts by weight of phosphoric acid, there is a problem that the reaction for polishing aluminum is difficult to be performed sufficiently, and if it exceeds 10 parts by weight, there is a problem that aluminum can be corroded due to strong acidity .

The present invention also provides a chemical polishing method using the composition for the post-processing of aluminum, comprising the steps of: (1) preparing a deep drawn aluminum molding by deep drawing molding an aluminum alloy; And two steps of impregnating the aluminum moldings with the composition according to the present invention and then chemically polishing at 70 ° C to 110 ° C. Hereinafter, the present invention will be described in detail by steps.

In the chemical polishing method according to the present invention, the step 1 is a step of forming a deep drawn aluminum molding by deep drawing an aluminum ingot, and the deep drawing forming is a step of reducing the diameter of the material, Means that the peripheral portion is narrowed to the center and processed into a shape of a glass (for example, a cup).

The deep drawing forming method may be a method in which a flat plate is worked into a hollow container without a joint by narrowing the peripheral portion of the plate inward by using a punch and a die or a method of spinning or using a spinning lathe And a pressing method in which a sheet metal is pressed on a model using a roller to perform rotational molding. The deep drawn aluminum moldings produced by performing the deep draw forming may lose the gloss due to the friction between the die and the aluminum ingot and may form an interface, which may act as a cause of uneven surface formation . Therefore, by polishing the surface chemically through a post-treatment process, the gloss of the aluminum surface can be improved and the surface roughness can be controlled.

At this time, the aluminum ingot may include at least one aluminum alloy selected from the group consisting of AL8079, 1N30, AL8021, AL3003, AL3004, AL3005, AL3104 and AL3105, preferably an aluminum alloy of AL 3003 good. The AL 3003 is an aluminum alloy having excellent formability and high strength, and is easy to form by deep drawing, and has excellent strength, so that it can be processed into a battery case of a PC or a mobile device.

In the chemical polishing method according to the present invention, the deep-drawn aluminum shaped article preferably has an average surface roughness (Ra) of 100 to 300 nm, more preferably 100 to 200 nm. The deep-drawn aluminum moldings have a non-uniform surface and lose gloss after being subjected to a deep drawing process, so that the average roughness value is relatively high as 100 to 300 nm. However, the average roughness value is about Can be lowered to 40 to 70 nm.

In the chemical polishing method according to the present invention, the aluminum moldings may be impregnated with the composition according to the present invention and then chemically polished at 70 ° C to 110 ° C, preferably at 80 ° C to 100 ° C, . When the polishing is carried out at a temperature lower than 70 캜, there is a problem that thermal energy is not sufficiently supplied and chemical polishing is not smoothly performed. In the case where the polishing is performed at a temperature exceeding 110 캜, uniform surface treatment is difficult to be performed .

When the deep-drawn aluminum molding is impregnated with the chemical polishing composition according to the present invention, aluminum contained in the deep drawn aluminum molding reacts with phosphoric acid and nitric acid contained in the chemical polishing composition as shown in Reaction Scheme 1, Can be chemically polished to lower the average surface roughness value. More specifically, the aluminum is rapidly oxidized in the protruded portion formed on the aluminum surface, and the reaction proceeds slowly in the recessed portion, so that the surface of the aluminum can be polished.

At this time, the polishing is preferably performed for 3 to 5 minutes, more preferably 4 to 5 minutes. When the polishing is performed for less than 3 minutes, there is a problem that the average roughness is not sufficiently lowered. When the polishing is performed for more than 5 minutes, there is no improvement in the roughness lower than the predetermined roughness. However, And there is a possibility that the entire surface of the substrate is chemically polished and the thickness thereof is reduced, thereby causing dimensional stability problems.

In addition, the aluminum in accordance with the present invention the chemical polishing composition for after deep-drawing step process is phosphoric acid (H ₃ PO ₄₎ with respect to 100 parts by weight of nitric acid (HNO ₃₎ 1 ~ 10 parts by weight, and water (H ₂ O ), 10 to 50 parts by weight of sulfuric acid, 5 to 10 parts by weight of sulfuric acid (H ₂ SO ₄ ) and 0.1 to 5 parts by weight of boric acid (H ₃ BO ₃ ). Preferably 6 to 8 parts by weight of sulfuric acid (H ₂ SO ₄ ) and 1 to 2 parts by weight of boric acid (H ₃ BO ₃ ) per 100 parts by weight of phosphoric acid (H ₃ PO ₄ ).

When sulfuric acid is contained in an amount of less than 5 parts by weight based on 100 parts by weight of phosphoric acid, there is a problem that the content of sulfuric acid is so small that it is difficult to accelerate the reaction of Reaction Scheme 1. In the case of containing sulfuric acid in an amount exceeding 10 parts by weight, There is a problem.

When the boric acid is contained in an amount of less than 0.1 part by weight based on 100 parts by weight of phosphoric acid, there is a problem that the oxide film on the aluminum surface is not dissolved. When the boric acid is contained in an amount exceeding 5 parts by weight, There is a problem in that it becomes heterogeneous.

The present invention also provides a chemical polishing method using the composition for the post-processing of aluminum, comprising the steps of: (1) preparing a deep drawn aluminum molding by deep drawing molding an aluminum alloy; And two steps of impregnating the aluminum moldings with the composition and then chemically polishing at 85 ° C to 105 ° C. Hereinafter, the present invention will be described in detail by steps.

In the chemical polishing method according to the present invention, the first step may be carried out under the same conditions and in the same manner as the above-described chemical polishing method.

In the chemical polishing process according to the invention, in the step 2, the aluminum molded product phosphoric acid (H ₃ PO ₄₎ with respect to 100 parts by weight of nitric acid (HNO ₃₎ 1 ~ 10 parts by weight, and water (H ₂ O) 10 And 5 to 10 parts by weight of sulfuric acid (H ₂ SO ₄ ) and 0.1 to 5 parts by weight of boric acid (H ₃ BO ₃ ), and then chemically polished at 85 ° C. to 105 ° C. have.

When the deep-drawn aluminum molding is impregnated with the chemical polishing composition according to the present invention, aluminum contained in the deep-drawn aluminum molding reacts with phosphoric acid, nitric acid, sulfuric acid and boric acid contained in the chemical polishing composition, The average surface roughness value can be lowered by chemically polishing. More specifically, the aluminum is rapidly oxidized in the protruded portion formed on the aluminum surface, and the reaction proceeds slowly in the recessed portion, so that the surface of the aluminum can be polished.

The polishing is preferably carried out at 85 ° C to 105 ° C, more preferably 90 ° C to 100 ° C. When the polishing is performed at a temperature lower than 85 캜, thermal energy is not sufficiently supplied and chemical polishing is not smoothly performed. If the polishing is performed at a temperature exceeding 105 캜, uniform surface treatment is difficult to be performed .

At this time, the polishing is preferably performed for 2 to 5 minutes, more preferably 3 to 5 minutes. When the polishing is performed for less than 2 minutes, the average roughness is not sufficiently lowered, and the surface roughness value is more than 100 nm. When the polishing is performed for more than 5 minutes, the roughness improvement is not observed. There is a problem that the process economical efficiency is lowered, and the overall chemical polishing is carried out, and the thickness is reduced, which may cause problems in dimensional stability.

The present invention also provides an aluminum product which is polished by the above methods and has an average surface roughness (Ra) of 10 to 70 nm. The aluminum product is impregnated with the chemical polishing composition according to the present invention and is chemically polished, whereby fine scratches formed on the aluminum surface are removed, so that the average roughness can be as low as 10 to 70 nm.

At this time, the aluminum product according to the present invention may include an oxide film on its surface. The Al ₂ O ₃ oxide film is dense and has high adhesion with the matrix and provides excellent protection against the matrix, and therefore has good corrosion resistance. The aluminum product produced by the process according to the present invention by the formation of the oxide film can exhibit excellent corrosion resistance.

The aluminum product according to the present invention may be a battery case. The aluminum product according to the present invention can be manufactured into a battery case through deep drawing using an aluminum ingot having excellent strength, moldability and weldability, and the micro-scratch is removed by performing the post-treatment process according to the present invention The surface roughness is uniform, the surface gloss is excellent, and the corrosion resistance can be improved by forming the oxide film, which is advantageous in that the battery case can be easily manufactured.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, but should be construed to facilitate understanding of the present invention.

[ Example ]

Example  1. Preparation of chemically polished aluminum alloy 1

Aluminum 3003 alloy (Daekyo Techno Co., Ltd.) was deep-drawn, and then a specimen having a size of 1 cm in width and 1 cm in length was collected. The test piece was impregnated with a chemical polishing composition containing 6.76 parts by weight of sulfuric acid, 4.2 parts by weight of nitric acid, 1.2 parts by weight of boric acid, and 38.19 parts by weight of water based on 100 parts by weight of phosphoric acid, followed by chemical polishing at 95 DEG C for 2 minutes and 20 seconds .

Example  2. Manufacture of chemically polished aluminum alloy 2

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished for 3 minutes.

Example  3. Preparation of chemically polished aluminum alloys 3

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished for 5 minutes.

Example  4. Manufacture of chemically polished aluminum alloy 4

Aluminum 3003 alloy (Daekyo Techno Co., Ltd.) was deep-drawn, and then a specimen having a size of 1 cm in width and 1 cm in length was collected. The above specimens were impregnated with a chemical polishing composition containing 4.35 parts by weight of nitric acid and 19.88 parts by weight of water per 100 parts by weight of phosphoric acid and chemically polished at 90 DEG C for 3 minutes.

Example  5. Manufacture of chemically polished aluminum alloy 5

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished for 3 minutes and 40 seconds.

Example  6. Manufacture of chemically polished aluminum alloy 6

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished for 4 minutes and 20 seconds.

Example  7. Manufacture of chemically polished aluminum alloy 7

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished for 5 minutes.

Comparative Example  1. Aluminum alloy without surface treatment

Aluminum 3003 alloy (Daekyo Techno Co., Ltd.) having a size of 1 cm in width and 1 cm in length was used.

Comparative Example  2. Aluminum alloy without surface treatment

Aluminum 3003 alloy (Daekyo Techno Co., Ltd.) having a size of 1 cm in width and 1 cm in length was used.

Comparative Example  3. Aluminum alloy without surface treatment

Aluminum 3003 alloy (Daekyo Techno Co., Ltd.) having a size of 1 cm in width and 1 cm in length was used.

Comparative Example  4. Mechanical polishing 1

Aluminum 3003 alloy (Daekyung Techno Co., Ltd.) was subjected to specimen processing at KH Vatec Co., Ltd., which was then subjected to mechanical polishing at a SM metal factory after being subjected to a grain size of 400, followed by a buffing through a 600 treatment. In this case, the particle size means the number of polishing roll meshes per 1 cm ² .

Comparative Example  5. Mechanical polishing 2

Aluminum 3003 alloy (Daekyung Techno Co., Ltd.) was submitted to KH Vatec for specimen processing, and after 400 grain size was processed in SM metal factory, it was buffed by 800 treatment and mechanical polishing was carried out. In this case, the particle size means the number of polishing roll meshes per 1 cm ² .

Comparative Example  6. Manufacture of chemically polished aluminum alloys

The same procedure as in Example 1 was carried out except that the sample was chemically polished by heating in the same manner as in Example 1 except that the sample was chemically polished by heating for 1 minute.

Comparative Example  7. Manufacture of chemically polished aluminum alloys

The same procedure as in Example 1 was carried out except that the sample was chemically polished by the same method as in Example 1 except that the sample was chemically polished by heating for 1 minute and 40 seconds.

Comparative Example 8 Manufacture of chemically polished aluminum alloys

The polishing was carried out in the same manner as in Example 1 except that the sample was chemically polished by heating in the same manner as in Example 1 except that the sample was chemically polished by heating for 6 minutes.

Experimental Example  One. Surface roughness  observe

The surfaces of the aluminum alloy specimens of Examples 1 to 7 and Comparative Examples 1 to 8 according to the present invention were observed using an atomic force microscope (AFM, Park systems / XE-100) Was measured. The results are shown in Table 1, and the illuminance values of Comparative Examples 6 and 7 and Examples 1 to 3 are shown in FIG.

Psalter Ra (nm) Example 1 68 Example 2 64.686 Example 3 64 Example 4 47.682 Example 5 25.976 Example 6 20.819 Example 7 17.172 Comparative Example 1 101.534 Comparative Example 2 192 Comparative Example 3 112 Comparative Example 4 140.958 Comparative Example 5 119.437 Comparative Example 6 125 Comparative Example 7 76.368 Comparative Example 8 64

According to the above Table 1, it can be confirmed that the surface roughness of the chemically polished Examples 1 to 7 appears in the range of 10 nm to 70 nm. In Comparative Examples 1 to 8, The surface roughness values of 100 to 200 nm are shown, and the mechanically polished Comparative Examples 4 and 5 show surface roughness values of about 100 to 150 nm.

In the case of the chemically polished Comparative Example 6 and Comparative Example 7, the surface roughness value was lower than that of Comparative Examples 1 to 5, but the chemical polishing time was short as 1 minute or 1 minute and 40 seconds, nm. < / RTI >

Therefore, according to the present invention, since the surface roughness is lower than that in the case of not performing the surface treatment or surface treatment through mechanical polishing, it can be understood that the chemical polishing method according to the present invention performs polishing more effectively.

In addition, according to FIG. 5, it can be seen that as the polishing time becomes longer, the surface roughness value decreases. Particularly, in Examples 1 to 3 where chemical polishing was performed for 2 to 5 minutes, surface roughness values of less than 70 nm . According to Comparative Example 8, when the chemical polishing was carried out for 6 minutes, compared with Example 3 in which the chemical polishing was performed for 5 minutes, the degree of gloss and surface roughness were not changed, but it was confirmed that the thickness of the sample decreased. In the case of the examples, the rate of change of thickness decreased by chemical polishing was 3% on average, but it was confirmed that the rate of change of thickness of the 5-minute chemical polishing treatment was 10% on average.

Therefore, when the chemical polishing method according to the present invention is industrially applied, it is possible to optimize the process time and control the dimensional stability while showing the effect of surface improvement.

Experimental Example  2. Observation of surface treated aluminum

The surfaces of the aluminum alloy specimens of Examples 1 to 7 and Comparative Examples 1 to 8 according to the present invention were observed using an optical microscope (OLYMPUS (BX41M-LED)) and the thickness of the alloy specimen was measured. The results are shown in Figs. 1 to 9.

2 is a photograph of a specimen of Comparative Example 1 in which no surface treatment was carried out. As shown in dark color in the case of no surface treatment, scratches were observed It can be confirmed that when the surface is treated by chemical polishing according to the present invention, scratches are less on the surface.

FIG. 3 is a photograph of the specimen of the surface-treated specimen of Example 1 at a high magnification, FIG. 2 is a photograph of specimen of Comparative Example 1 of the specimen not subjected to the surface treatment at a high magnification, The dark scratches formed were relatively small in the surface treated specimens.

Therefore, according to the chemical polishing method of the present invention, the scratches formed through the deep drawing process can be removed, and an aluminum alloy having excellent surface roughness can be produced.

Claims (10)

delete Phosphoric acid (H ₃ PO ₄₎ with respect to 100 parts by weight of nitric acid (HNO ₃₎ 1 ~ 10 parts by weight of sulfuric acid _{(H 2 SO 4) 5 ~} 10 parts by weight of boric acid _{(H 3 BO 3) 0.1 ~} 5 parts by weight, and And 10 to 50 parts by weight of water (H ₂ O). delete delete A first step of forming a deep drawn aluminum molding by deep drawing molding an aluminum alloy; And
And a second step of impregnating the aluminum moldings with the composition of claim 2 and then chemically polishing at 85 ° C to 105 ° C.
6. The method of chemical polishing of aluminum according to claim 5, wherein in step 2, the polishing is performed for 2 to 5 minutes.
6. The method of claim 5, wherein the aluminum ingot comprises at least one aluminum alloy selected from the group consisting of AL8079, 1N30, AL8021, AL3003, AL3004, AL3005, AL3104 and AL3105.
6. The method of claim 5, wherein the aluminum ingot comprises an aluminum alloy of AL3003.
delete delete

Images