Processing heat treatment process of 6063 aluminum alloy profile

Abstract

A processing heat treatment process of a 6063 aluminum alloy section belongs to the field of heat treatment of 6063 aluminum alloys, and comprises the following steps: step 1, carrying out solution treatment on a 6063 aluminum alloy plate; secondly, the 6063 aluminum alloy plate subjected to solution treatment in the first step is subjected to quenching treatment; thirdly, the 6063 aluminum alloy plate subjected to quenching treatment in the second step is subjected to aging treatment; fourthly, the 6063 aluminum alloy plate subjected to aging treatment in the third step is subjected to annealing treatment; and fifthly, the 6063 aluminum alloy plate annealed in the fourth step is subjected to aging treatment. According to the method, the 6063 aluminum alloy is subjected to heat treatment through solid solution, quenching, aging, annealing and aging, meanwhile, the optimal temperature range and time range are obtained after a large number of tests and studies are conducted on the treatment temperature and time, and therefore the high-performance 6063 aluminum alloy can be obtained, and long-term stable use of a profile prepared from the 6063 aluminum alloy is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of 6063 aluminum alloy heat treatment, in particular to a processing heat treatment process for 6063 aluminum alloy profiles. Background Art

[0002] 6063 aluminum alloy is an aluminum alloy commonly used in the construction industry. It is made into profiles such as aluminum alloy doors and windows, railings, and building curtain walls. Since the profiles prepared from it are mostly used outdoors, the performance requirements for them are much greater than those of ordinary aluminum alloys (especially hardness performance). Therefore, in order to ensure the performance of the profiles prepared from 6063 aluminum alloy, heat treatment operations must be performed during the production process to improve their performance. Therefore, how to optimize the heat treatment operation to improve the performance of 6063 aluminum alloy is a problem that needs to be solved urgently. Summary of the Invention

[0003] The present invention provides a processing heat treatment process for a 6063 aluminum alloy profile, so as to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A heat treatment process for 6063 aluminum alloy profiles, comprising the following steps:

[0006] Step 1: Solution treatment of 6063 aluminum alloy plate;

[0007] Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1;

[0008] Step 3: Performing aging treatment on the 6063 aluminum alloy plate after quenching treatment in step 2;

[0009] Step 4: Annealing the 6063 aluminum alloy sheet after aging treatment in step 3;

[0010] Step 5: Perform aging treatment on the 6063 aluminum alloy sheet after annealing treatment in step 4.

[0011] In the processing heat treatment process of the 6063 aluminum alloy profile described above, in the step 1, the surface of the 6063 aluminum alloy plate is cleaned with 40-50°C water before solution treatment, and then the surface of the 6063 aluminum alloy plate is cleaned with 40-50°C cleaning liquid to remove grease and debris remaining on the surface of the 6063 aluminum alloy plate during the rolling process. After the cleaning liquid is cleaned, the surface of the 6063 aluminum alloy plate is cleaned with 40-50°C water, and then cleaned again with 40-50°C acid to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, the residual acid is rinsed again with 40-50°C clean water to avoid affecting the effect of the solution treatment in the subsequent solution treatment.

[0012] In the above-mentioned heat treatment process for a 6063 aluminum alloy profile, the cleaning agent is a sodium carbonate solution with a concentration of 10%.

[0013] In the heat treatment process for a 6063 aluminum alloy profile as described above, the acid solution is obtained by mixing 10% sulfuric acid, 15% hydrochloric acid, and 10% nitric acid in a volume ratio of 1:1:1.

[0014] In the processing heat treatment process of the 6063 aluminum alloy profile described above, the temperature of the solution treatment in step one is 530-550°C, the heating rate of the solution treatment in step one is 8-10°C / s, and the solution treatment temperature in step one is raised to the specified temperature for 5 minutes and then kept warm for 50-70 minutes.

[0015] In the heat treatment process for the 6063 aluminum alloy profile described above, the quenching method in step 2 is to cool the material by water quenching, and the cooling rate is controlled at 180-220°C / min.

[0016] In the above-mentioned heat treatment process for a 6063 aluminum alloy profile, before aging treatment in step 3, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C acid solution to remove the surface, and after the pickling is completed, the plate is rinsed again with 40-50°C clean water to remove the residual acid solution. The aging treatment temperature in step 3 is 190-210°C, the heating rate of the aging treatment in step 3 is 10-12°C / s, and the aging treatment temperature in step 3 is raised to the specified temperature for 2 minutes and then maintained at the temperature for 150-160 minutes.

[0017] In the above-mentioned heat treatment process for a 6063 aluminum alloy profile, before the annealing treatment in step 4, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C acid solution to remove the surface, and after the pickling is completed, the residual acid is rinsed again with 40-50°C clean water to remove the residual acid; the temperature of the annealing treatment in step 4 is 450-470°C, the heating rate of the annealing treatment in step 4 is 6-8°C / s, and the annealing temperature in step 4 is raised to the specified temperature for 4 minutes and then kept at this temperature for 260-300 minutes.

[0018] In the above-mentioned heat treatment process for a 6063 aluminum alloy profile, before the aging treatment in step 5, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50° C. acid solution to remove the oxide layer, and after the pickling is completed, the plate is rinsed again with 40-50° C. clean water to remove the residual acid solution; the temperature of the aging treatment in step 5 is 215-225° C., the heating rate of the aging treatment in step 5 is 10-12° C. / s, and the aging treatment temperature in step 5 is raised to the specified temperature for 2 minutes and then maintained at the temperature for 80-100 minutes.

[0019] In the heat treatment process for a 6063 aluminum alloy profile as described above, the acid solution is obtained by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1.

[0020] The advantages of the present invention are as follows: the present invention heat treats the 6063 aluminum alloy through solid solution-quenching-aging-annealing-aging, and simultaneously obtains the optimal temperature range and time range after a large number of tests and studies on the temperature and time of each treatment, thereby obtaining a high-performance 6063 aluminum alloy, improving its hardness and other properties, and ensuring the long-term and stable use of the profile prepared therefrom. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] Example 1

[0023] Step 1: Clean the surface of 6063 aluminum alloy plate (its alloy composition percentage is: Mg 0.7%, Si 0.4%, Cu0.04%, Fe 0.05%, Mn 0.02%, Zn 0.03%, other impurities are 0.06%, the balance is Al, and the plate thickness is 3mm) with 40℃ water, and then use 40℃ cleaning liquid (that is, 10% sodium carbonate solution) to clean the surface of 6063 aluminum alloy plate to remove grease and debris remaining on the surface of 6063 aluminum alloy plate during rolling. After cleaning with cleaning liquid, clean the surface of 6063 aluminum alloy plate with 40℃ water, and then use 40-50℃ The 6063 aluminum alloy plate was cleaned again with an acid solution (the acid solution was obtained by mixing 10% sulfuric acid, 15% hydrochloric acid and 10% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the plate. After the pickling was completed, the plate was rinsed again with 40°C water to remove the residual acid solution, and then a solution treatment was performed. The solution treatment temperature was 530°C, the solution treatment heating rate was 8°C / s, the solution treatment temperature was raised to 530°C and maintained for 5 minutes, and then kept warm for 70 minutes;

[0024] Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1, using water quenching to cool the plate, with the cooling rate controlled at 180-220°C / min;

[0025] Step 3: The 6063 aluminum alloy plate quenched in step 2 is cleaned with a 40°C acid solution (the acid solution is a mixture of 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, the plate is rinsed again with 40°C clean water to remove the residual acid solution; then an aging treatment is performed, the aging treatment temperature is 190°C, the aging treatment heating rate is 10°C / s, the aging treatment temperature is raised to 190°C, and the temperature is maintained for 2 minutes, and then the temperature is kept for 160 minutes;

[0026] Step 4: The 6063 aluminum alloy plate after the aging treatment in step 3 is cleaned with a 40°C acid solution (the acid solution is a mixture of 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, it is rinsed again with 40°C clean water to remove the residual acid solution; then annealing treatment is performed, the annealing temperature is 450°C, the aging treatment heating rate is 6°C / s, the annealing temperature is increased to 450°C, and then maintained for 4 minutes, and then kept warm for 300 minutes;

[0027] Step 5: The 6063 aluminum alloy plate annealed in step 4 was cleaned with a 40°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 40°C clean water to remove the residual acid solution; then an aging treatment was performed, the aging treatment temperature was 215°C, the aging treatment heating rate was 10°C / s, the aging treatment temperature was increased to 215°C, and the temperature was maintained for 2 minutes, and then the temperature was kept warm for 100 minutes.

[0028] Example 2

[0029] Step 1: Clean the surface of 6063 aluminum alloy plate (its alloy composition percentage is: Mg 0.7%, Si 0.4%, Cu0.04%, Fe 0.05%, Mn 0.02%, Zn 0.03%, other impurities are 0.06%, the balance is Al, and the plate thickness is 3mm) with 40-50℃ water, and then use 50℃ cleaning liquid (i.e., 10% sodium carbonate solution) to clean the surface of 6063 aluminum alloy plate to remove grease and debris remaining on the surface of 6063 aluminum alloy plate during rolling. After cleaning with cleaning liquid, clean the surface of 6063 aluminum alloy plate with 50℃ water, and then use 50℃ Acid solution (the acid solution is obtained by mixing 10% sulfuric acid, 15% hydrochloric acid and 10% nitric acid in a volume ratio of 1:1:1) is used to clean the surface of the 6063 aluminum alloy plate again to remove the oxide layer. After the pickling is completed, it is rinsed again with 50°C clean water to remove the residual acid solution, and then a solution treatment is performed. The solution treatment temperature is 550°C, the solution treatment heating rate is 10°C / s, and the solution treatment temperature is maintained at 550°C for 5 minutes and then kept warm for 50 minutes;

[0030] Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1, using water quenching to cool the plate, with the cooling rate controlled at 180-220°C / min;

[0031] Step 3: The 6063 aluminum alloy plate quenched in step 2 was cleaned with a 50°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 50°C water to remove the residual acid solution; then an aging treatment was performed, the aging treatment temperature was 210°C, the aging treatment heating rate was 12°C / s, the aging treatment temperature was raised to 210°C, and the temperature was maintained for 2 minutes, and then the temperature was kept for 150 minutes;

[0032] Step 4: The 6063 aluminum alloy plate after the aging treatment in step 3 is cleaned with a 40-50°C acid solution (the acid solution is a mixture of 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, it is rinsed again with 50°C clean water to remove the residual acid solution; then annealing treatment is performed, the annealing temperature is 470°C, the aging treatment heating rate is 8°C / s, the annealing temperature is increased to 470°C, and the temperature is maintained for 4 minutes, and then the temperature is kept for 260 minutes;

[0033] Step 5: The 6063 aluminum alloy plate annealed in step 4 was cleaned with a 50°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 50°C clean water to remove the residual acid solution; then an aging treatment was performed. The aging treatment temperature was 225°C, the aging treatment heating rate was 12°C / s, the aging treatment temperature was raised to 225°C, and the temperature was maintained for 2 minutes, and then the temperature was kept warm for 80 minutes.

[0034] Example 3

[0035] Step 1: Clean the surface of 6063 aluminum alloy plate (its alloy composition percentage is: Mg 0.7%, Si 0.4%, Cu0.04%, Fe 0.05%, Mn 0.02%, Zn 0.03%, other impurities are 0.06%, the balance is Al, and the plate thickness is 3mm) with 45℃ water, and then use 45℃ cleaning liquid (i.e., 10% sodium carbonate solution) to clean the surface of 6063 aluminum alloy plate to remove grease and debris remaining on the surface of 6063 aluminum alloy plate during rolling. After cleaning with cleaning liquid, clean the surface of 6063 aluminum alloy plate with 45℃ water, and then use 45℃ acid The 6063 aluminum alloy plate was cleaned again with a solution (the acid solution was obtained by mixing 10% sulfuric acid, 15% hydrochloric acid and 10% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 45°C clean water to remove the residual acid solution, and then a solution treatment was performed. The solution treatment temperature was 540°C, the solution treatment heating rate was 9°C / s, and the solution treatment temperature was maintained at 540°C for 5 minutes and then kept warm for 60 minutes.

[0036] Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1, using water quenching to cool the plate, with the cooling rate controlled at 180-220°C / min;

[0037] Step 3: The 6063 aluminum alloy plate quenched in step 2 was cleaned with a 45°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 45°C clean water to remove the residual acid solution; then an aging treatment was performed, the aging treatment temperature was 200°C, the aging treatment heating rate was 11°C / s, the aging treatment temperature was raised to 200°C, and the temperature was maintained for 2 minutes, and then the temperature was kept for 155 minutes;

[0038] Step 4: The 6063 aluminum alloy plate after the aging treatment in step 3 is cleaned with a 45°C acid solution (the acid solution is a mixture of 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, it is rinsed again with 45°C clean water to remove the residual acid solution; then annealing treatment is performed, the annealing temperature is 460°C, the aging treatment heating rate is 7°C / s, the annealing temperature is increased to 460°C, and the temperature is maintained for 4 minutes, and then the temperature is kept for 280 minutes;

[0039] Step 5: The 6063 aluminum alloy plate annealed in step 4 was cleaned with a 45°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 45°C clean water to remove the residual acid solution; then an aging treatment was performed. The aging treatment temperature was 220°C, the aging treatment heating rate was 11°C / s, the aging treatment temperature was raised to 220°C, and the temperature was maintained for 2 minutes, and then the temperature was kept warm for 90 minutes.

[0040] Comparative Example 1

[0041] Step 1: Clean the surface of 6063 aluminum alloy plate (its alloy composition percentage is: Mg 0.7%, Si 0.4%, Cu0.04%, Fe 0.05%, Mn 0.02%, Zn 0.03%, other impurities are 0.06%, the balance is Al, and the plate thickness is 3mm) with 45℃ water, and then use 45℃ cleaning liquid (i.e., 10% sodium carbonate solution) to clean the surface of 6063 aluminum alloy plate to remove grease and debris remaining on the surface of 6063 aluminum alloy plate during rolling. After cleaning with cleaning liquid, clean the surface of 6063 aluminum alloy plate with 45℃ water, and then use 45℃ Acid solution (the acid solution is obtained by mixing 10% sulfuric acid, 15% hydrochloric acid and 10% nitric acid in a volume ratio of 1:1:1) is used to clean the surface of the 6063 aluminum alloy plate again to remove the oxide layer. After the pickling is completed, it is rinsed again with 45°C clean water to remove the residual acid solution, and then a solution treatment is performed. The solution treatment temperature is 530-550°C, the solution treatment heating rate is 9°C / s, and the solution treatment temperature is raised to the specified temperature for 5 minutes and then kept at this temperature for 60 minutes;

[0042] Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1, using water quenching to cool the plate, with the cooling rate controlled at 180-220°C / min;

[0043] Step 3: The 6063 aluminum alloy plate quenched in step 2 is cleaned with a 45°C acid solution (the acid solution is a mixture of 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, it is rinsed again with 45°C clean water to remove the residual acid; then an aging treatment is performed, the aging treatment temperature is 200°C, the aging treatment heating rate is 11°C / s, the aging treatment temperature is raised to the specified temperature for 2 minutes, and then kept warm for 155 minutes.

[0044] Comparative Example 2

[0045] Step 1: Prepare 6063 aluminum alloy sheet (its alloy composition percentage is: Mg 0.7%, Si 0.4%, Cu 0.04%, Fe 0.05%, Mn 0.02%, Zn 0.03%, other impurities are 0.06%, the balance is Al, and the plate thickness is 3 mm) the surface of the 6063 aluminum alloy plate is cleaned with 45°C water, and then the surface of the 6063 aluminum alloy plate is cleaned with 45°C cleaning solution (i.e., a 10% sodium carbonate solution) to remove grease and debris remaining on the surface of the 6063 aluminum alloy plate during the rolling process. After the cleaning solution is cleaned, the surface of the 6063 aluminum alloy plate is cleaned with 45°C water, and then the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with 45°C acid (the acid is a mixture of 15% sulfuric acid, 20% hydrochloric acid and 15% nitric acid in a volume ratio of 1:1:1). After the pickling is completed, the plate is rinsed again with 45°C clean water to remove the residual acid; annealing treatment is then performed, the annealing temperature is 460°C, the heating rate of the aging treatment is 7°C / s, the annealing temperature is raised to the specified temperature for 4 minutes and then kept warm for 280 minutes;

[0046] Step 2: The 6063 aluminum alloy plate annealed in step 1 was cleaned with a 45°C acid solution (the acid solution was prepared by mixing 15% sulfuric acid, 20% hydrochloric acid, and 15% nitric acid in a volume ratio of 1:1:1) to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling was completed, the plate was rinsed again with 45°C clean water to remove the residual acid solution; then an aging treatment was performed. The aging treatment temperature was 220°C, the aging treatment heating rate was 11°C / s, and the aging treatment temperature was raised to the specified temperature for 2 minutes and then kept warm for 90 minutes.

[0047] The properties of the 6063 aluminum alloy plates after heat treatment in Examples 1-3 and Comparative Examples 1-2 were tested, and the performance test results are shown in Table 1.

[0048] Group Tensile strength (MPa) Yield strength (MPa) Elongation (%) Hardness (HW) Example 1 258 198 11.2 15.3 Example 2 261 197 10.9 15.2 Example 3 266 203 11.5 15.8 Comparative Example 1 224 161 8.5 11.8 Comparative Example 2 215 149 8.1 11.2

[0049] Table 1

[0050] As can be seen from the data in Table 1, the hardness, tensile strength, yield strength, and elongation of Examples 1-3 are all better than those of Comparative Examples 1-2. Therefore, the hardness, tensile strength, yield strength, and elongation of the 6063 aluminum alloy plate after heat treatment of the present invention are excellent, thereby ensuring that the profiles prepared therefrom can be used stably outdoors for a long time.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A heat treatment process for 6063 aluminum alloy profiles, characterized by: The steps include: Step 1: Solution treatment of 6063 aluminum alloy plate; Step 2: quenching the 6063 aluminum alloy plate after the solution treatment in step 1; Step 3: Performing aging treatment on the 6063 aluminum alloy plate after quenching treatment in step 2; Step 4: Annealing the 6063 aluminum alloy sheet after aging treatment in step 3; Step 5: Perform aging treatment on the 6063 aluminum alloy sheet after annealing treatment in step 4.

2. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: In the step 1, the surface of the 6063 aluminum alloy plate is cleaned with 40-50°C water before the solution treatment, and then the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C cleaning solution to remove grease and debris remaining on the surface of the 6063 aluminum alloy plate during the rolling process. After the cleaning solution is cleaned, the surface of the 6063 aluminum alloy plate is cleaned with 40-50°C water, and then the surface of the 6063 aluminum alloy plate is cleaned again with a 40-50°C acid solution to remove the oxide layer on the surface of the 6063 aluminum alloy plate. After the pickling is completed, the residual acid is rinsed again with 40-50°C clean water to avoid affecting the effect of the solution treatment in the subsequent solution treatment.

3. The heat treatment process for a 6063 aluminum alloy profile according to claim 2, characterized in that: The cleaning agent is a sodium carbonate solution with a concentration of 10%.

4. The heat treatment process for a 6063 aluminum alloy profile according to claim 2, characterized in that: The acid solution is obtained by mixing 10% sulfuric acid, 15% hydrochloric acid and 10% nitric acid in a volume ratio of 1:1:

1.

5. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: The temperature of the solution treatment in step one is 530-550°C, the heating rate of the solution treatment in step one is 8-10°C / s, and the solution treatment temperature in step one is raised to the specified temperature for 5 minutes and then kept warm for 50-70 minutes.

6. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: The quenching method in the step 2 is to cool the steel by water quenching, and the cooling rate is controlled at 180-220°C / min.

7. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: Before the aging treatment in step 3, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C acid solution, and after the pickling is completed, the residual acid is rinsed again with 40-50°C clean water to remove the residual acid. The temperature of the aging treatment in step 3 is 190-210°C, the heating rate of the aging treatment in step 3 is 10-12°C / s, and the aging treatment temperature in step 3 is increased to the specified temperature for 2 minutes and then maintained at this temperature for 150-160 minutes.

8. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: Before the annealing treatment in the fourth step, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C acid solution to remove the oxide layer. After the pickling is completed, the plate is rinsed again with 40-50°C clean water to remove the residual acid. The temperature of the annealing treatment in the fourth step is 450-470°C, the heating rate of the annealing treatment in the fourth step is 6-8°C / s, and the annealing temperature in the fourth step is increased to the specified temperature for 4 minutes and then kept warm for 260-300 minutes.

9. The heat treatment process for a 6063 aluminum alloy profile according to claim 1, characterized in that: Before the aging treatment in step 5, the oxide layer on the surface of the 6063 aluminum alloy plate is cleaned with a 40-50°C acid solution, and after the pickling is completed, the residual acid is rinsed again with 40-50°C clean water to remove the residual acid. The temperature of the aging treatment in step 5 is 215-225°C, the heating rate of the aging treatment in step 5 is 10-12°C / s, and the aging treatment temperature in step 5 is increased to the specified temperature for 2 minutes and then kept warm for 80-100 minutes.

10. The heat treatment process for a 6063 aluminum alloy profile according to claim 7, 8 or 9, characterized in that: The acid solution is obtained by mixing 15% sulfuric acid, 20% hydrochloric acid and 15% nitric acid in a volume ratio of 1:1:1.