High-strength light-weight aluminum alloy profile for 6005C photovoltaic frame and preparation method of high-strength light-weight aluminum alloy profile

Abstract

The invention discloses a high-strength light-weight aluminum alloy profile for a 6005C photovoltaic frame and a preparation method of the high-strength light-weight aluminum alloy profile, and relates to the technical field of solar photovoltaics, and the high-strength light-weight aluminum alloy profile comprises the following chemical components in percentage by mass: 0.7-0.9% of Si, less than or equal to 0.16% of Fe, less than or equal to 0.01% of Cu, 0.3-0.5% of Mn, 0.6-0.8% of Mg, less than or equal to 0.03% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.05% of Ti and the balance of Al and other inevitable impurities. The high-strength light aluminum alloy profile for the 6005C photovoltaic frame is high in tensile strength, sufficient in toughness, high in hardness and excellent in corrosion resistance and fatigue resistance.

Description

Technical Field

[0001] The invention relates to the technical field of solar photovoltaic technology, and in particular to a high-strength and lightweight aluminum alloy profile for a 6005C photovoltaic frame and a preparation method thereof. Background Art

[0002] Solar photovoltaic frames are an important part of solar cell modules. Their main function is to protect photovoltaic modules and provide structural support. At present, most photovoltaic frames are made of 6063 aluminum alloy extruded profiles processed by anodizing. Its good extrusion formability and oxidizability are widely used. However, the strength and corrosion resistance of 6063 aluminum alloy are difficult to meet the increasingly high performance requirements of photovoltaic modules. It is in this form that 6005C photovoltaic frames came into being. 6005C aluminum alloy has high strength and good corrosion resistance. However, due to the composition formula and preparation process, the 6005C aluminum alloy on the market still has many deficiencies in strength, toughness, lightweight and cost. Its application in photovoltaic frames still needs to be further optimized to meet the needs of high strength and light weight.

[0003] In order to solve the above problems, the Chinese invention patent with the authorization announcement number CN118028665B discloses a high-strength aluminum alloy profile for solar photovoltaic frames and its preparation method, which relates to the technical field of aluminum alloy materials; its chemical composition includes by mass percentage: Si 0.60-0.90%, Mg 0.40-0.70%, Fe≤0.25%, Ti≤0.10%, Mn≤0.15%, Cr≤0.15%, Zn≤0.10%, Zr≤0.20%, Cu 0.03-0.10%, the balance is Al, and the total amount is 100%. The invention adjusts the content of Si, Fe, Mn, Mg, Cr, Zn, Ti, Zr, and Cu in the aluminum alloy profile and the homogenization process, and the prepared aluminum alloy profile has high strength, high elongation and excellent corrosion resistance, which is suitable for the field of solar photovoltaic frames. However, its fatigue resistance still needs to be further improved.

[0004] It can be seen that the development of a high-strength and lightweight aluminum alloy profile for 6005C photovoltaic frames with high tensile strength, sufficient toughness, high hardness, excellent corrosion resistance and fatigue resistance and its preparation method meets market demand and is of great significance to promoting the development of solar photovoltaic technology. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-strength and lightweight aluminum alloy profile for 6005C photovoltaic frames with high tensile strength, sufficient toughness, high hardness, excellent corrosion resistance and fatigue resistance, and a preparation method thereof.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-strength and lightweight aluminum alloy profile for a 6005C photovoltaic frame, the chemical composition of which includes, by mass percentage, Si 0.7%-0.9%, Fe≤0.16%, Cu≤0.01%, Mn0.3%-0.5%, Mg 0.6%-0.8%, Cr≤0.03%, Zn≤0.05%, Ti≤0.05%, and the balance is Al and other inevitable impurities.

[0007] Preferably, the mass percentage of the other inevitable impurities is ≤0.05%.

[0008] Preferably, the chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in percentage by mass: rare earth elements 0.01%-0.03%, Nb≤0.02%, B 0.001%-0.003%, Sr≤0.01%, Ta0.005%-0.015%, Hf≤0.01%.

[0009] Preferably, the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:(0.8-1.2):(1-2).

[0010] Another object of the present invention is to provide a method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames, comprising the following steps:

[0011] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0012] Step S2, casting the refined molten metal into a round ingot, heating it to 480-500° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0013] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0014] Preferably, the smelting temperature in step S1 is 720-760°C.

[0015] Preferably, the temperature of the uniform post-treatment in step S2 is 540-560° C. and the time is 6-8 hours.

[0016] Preferably, the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment.

[0017] Preferably, the solution treatment temperature is 530-550° C., the holding time is 1-2 h, and water quenching is performed.

[0018] Preferably, the temperature of the artificial aging treatment is 160-180° C., and the insulation time is 5-7 hours.

[0019] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0020] (1) The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames disclosed in the present invention has a simple preparation process, convenient operation and control, high preparation efficiency and finished product qualification rate, low dependence on equipment, suitable for continuous large-scale production, and has high promotion and application value.

[0021] (2) The 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames disclosed in the present invention has a chemical composition, in terms of mass percentage, comprising: Si 0.7%-0.9%, Fe≤0.16%, Cu≤0.01%, Mn 0.3%-0.5%, Mg 0.6%-0.8%, Cr≤0.03%, Zn≤0.05%, Ti≤0.05%, and the remainder is Al and other inevitable impurities; the mass percentage of the other inevitable impurities is ≤0.05%; by precisely controlling the contents of Si, Mn and Mg, the precipitation of the Mg2Si strengthening phase is optimized, thereby improving the strength and toughness. Through the reasonable selection of each component and the dosage ratio, the components can better exert their mutual influence, giving the product excellent tensile strength, toughness, hardness, corrosion resistance and fatigue resistance; the chemical composition of the 6005C high-strength lightweight aluminum alloy profile for photovoltaic frames also includes the following mass percentage components: rare earth elements 0.01%-0.03%, Nb≤0.02%, B 0.001%-0.003%, Sr≤0.01%, Ta 0.005%-0.015%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1: (0.8-1.2): (1-2). By adding the above components in combination, they cooperate with each other and with other components in the composition, which can further improve the tensile strength, toughness, hardness, corrosion resistance and fatigue resistance of the product; by strictly limiting the content of impurity components, the corrosion resistance can be effectively improved.

[0022] (3) The 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames disclosed in the present invention applies the optimized 6005C aluminum alloy to photovoltaic frames for the first time, filling the performance shortcomings of traditional materials; through the reasonable selection of preparation process parameters, the tensile strength, toughness, hardness, corrosion resistance and fatigue resistance of the aluminum alloy profile can be further improved. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] Example 1

[0025] A 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame, the chemical composition of which, in terms of mass percentage, comprises: Si 0.7%, Fe ≤ 0.16%, Cu ≤ 0.01%, Mn 0.3%, Mg 0.6%, Cr ≤ 0.03%, Zn ≤ 0.05%, Ti ≤ 0.05%, and the balance is Al and other inevitable impurities.

[0026] The mass percentage of the other inevitable impurities is ≤0.05%.

[0027] The chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in percentage by mass: rare earth elements 0.01%, Nb≤0.02%, B 0.001%, Sr≤0.01%, Ta 0.005%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:0.8:1.

[0028] A method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames comprises the following steps:

[0029] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0030] Step S2, casting the refined molten metal into a round ingot, heating it to 480° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0031] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0032] The smelting temperature in step S1 is 720°C; the temperature of the uniform post-treatment in step S2 is 540°C and the time is 6 hours; the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment; the solution treatment temperature is 530°C, the holding time is 1 hour, and water quenching; the artificial aging treatment temperature is 160°C, and the holding time is 5 hours.

[0033] Example 2

[0034] A 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame, the chemical composition of which, in terms of mass percentage, comprises: Si 0.75%, Fe ≤ 0.16%, Cu ≤ 0.01%, Mn 0.35%, Mg 0.65%, Cr ≤ 0.03%, Zn ≤ 0.05%, Ti ≤ 0.05%, and the balance is Al and other inevitable impurities.

[0035] The mass percentage of the other inevitable impurities is ≤0.05%; the chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in mass percentage: rare earth elements 0.015%, Nb≤0.02%, B0.0015%, Sr≤0.01%, Ta 0.007%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:0.9:1.2.

[0036] A method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames comprises the following steps:

[0037] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0038] Step S2, casting the refined molten metal into a round ingot, heating it to 485° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0039] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0040] The smelting temperature in step S1 is 730°C; the temperature of the uniform post-treatment in step S2 is 545°C and the time is 6.5h; the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment; the solution treatment temperature is 535°C, the holding time is 1.2h, and water quenching; the artificial aging treatment temperature is 165°C, and the holding time is 5.5h.

[0041] Example 3

[0042] A 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame, the chemical composition of which, in terms of mass percentage, comprises: Si 0.8%, Fe ≤ 0.16%, Cu ≤ 0.01%, Mn 0.4%, Mg 0.7%, Cr ≤ 0.03%, Zn ≤ 0.05%, Ti ≤ 0.05%, and the balance is Al and other inevitable impurities.

[0043] The mass percentage of the other inevitable impurities is ≤0.05%; the chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in mass percentage: rare earth elements 0.02%, Nb≤0.02%, B0.002%, Sr≤0.01%, Ta 0.01%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:1:1.5.

[0044] A method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames comprises the following steps:

[0045] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0046] Step S2, casting the refined molten metal into a round ingot, heating it to 490° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0047] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0048] The smelting temperature in step S1 is 740°C; the temperature of the uniform post-treatment in step S2 is 550°C and the time is 7h; the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment; the solution treatment temperature is 540°C, the holding time is 1.5h, and water quenching; the artificial aging treatment temperature is 170°C, and the holding time is 6h.

[0049] Example 4

[0050] A 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame, the chemical composition of which, in terms of mass percentage, comprises: Si 0.85%, Fe ≤ 0.16%, Cu ≤ 0.01%, Mn 0.45%, Mg 0.75%, Cr ≤ 0.03%, Zn ≤ 0.05%, Ti ≤ 0.05%, and the balance is Al and other inevitable impurities.

[0051] The mass percentage of the other inevitable impurities is ≤0.05%; the chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in mass percentage: rare earth elements 0.025%, Nb≤0.02%, B0.0025%, Sr≤0.01%, Ta 0.013%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:1.1:1.8.

[0052] A method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames comprises the following steps:

[0053] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0054] Step S2, casting the refined molten metal into a round ingot, heating it to 495° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0055] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0056] The smelting temperature in step S1 is 750°C; the temperature of the uniform post-treatment in step S2 is 555°C and the time is 7.5h; the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment; the temperature of the solution treatment is 545°C, the holding time is 1.8h, and water quenching; the temperature of the artificial aging treatment is 175°C, and the holding time is 6.5h.

[0057] Example 5

[0058] A 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame, the chemical composition of which, in terms of mass percentage, comprises: Si 0.9%, Fe ≤ 0.16%, Cu ≤ 0.01%, Mn 0.5%, Mg 0.8%, Cr ≤ 0.03%, Zn ≤ 0.05%, Ti ≤ 0.05%, and the balance is Al and other inevitable impurities.

[0059] The mass percentage of the other inevitable impurities is ≤0.05%; the chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in mass percentage: rare earth elements 0.01%-0.03%, Nb≤0.02%, B 0.001%-0.003%, Sr≤0.01%, Ta 0.005%-0.015%, Hf≤0.01%; the rare earth elements are Sc, Y, and Pr mixed in a mass ratio of 1:1.2:2.

[0060] A method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames comprises the following steps:

[0061] Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal;

[0062] Step S2, casting the refined molten metal into a round ingot, heating it to 500° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape;

[0063] Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

[0064] The smelting temperature in step S1 is 760°C; the temperature of the uniform post-treatment in step S2 is 560°C and the time is 8 hours; the T6 heat treatment in step S3 includes solution treatment and artificial aging treatment; the solution treatment temperature is 550°C, the holding time is 2 hours, and water quenching; the artificial aging treatment temperature is 180°C, and the holding time is 7 hours.

[0065] Comparative Example 1

[0066] A high-strength and lightweight aluminum alloy profile for a 6005C photovoltaic frame and a preparation method thereof are basically the same as those in Example 1, except that no rare earth elements and Ta are added.

[0067] Comparative Example 2

[0068] A high-strength and lightweight aluminum alloy profile for a 6005C photovoltaic frame and a preparation method thereof are basically the same as those in Example 1, except that no homogenization treatment and solution treatment steps are added.

[0069] In order to further illustrate the beneficial technical effects of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames involved in each embodiment of the present invention, relevant performance tests were carried out on the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. The test method is as follows: the tensile strength, yield strength and elongation are tested in accordance with "GB / T 16865-2013 Specimens and Methods for Tensile Test of Deformed Aluminum, Magnesium and Their Alloy Products"; the Webster hardness is tested in accordance with the "YS / T 420 Webster Hardness Test Method for Aluminum Alloy" standard; the Amsler The specimens were subjected to equal amplitude fatigue tests (maximum load 100MPa, minimum load 20MPa) on a HFP-422 high frequency fatigue testing machine, and the fatigue life was recorded and counted. The prepared aluminum alloy profiles were subjected to salt spray corrosion resistance tests at a test temperature of 35°C. A 5% mass concentration sodium chloride aqueous solution was sprayed in the test box to simulate accelerated corrosion in the environment. The tolerance time (i.e., the time it remains rust-free) of the aluminum alloy profiles determines the quality of its corrosion resistance.

[0070] Table 1

[0071] project tensile strength Yield Strength Elongation at break Webster hardness Fatigue life Corrosion resistance unit MPa MPa ％ HW Ten thousand times h Example 1 343 320 13.1 17.0 16.5 1020 Example 2 348 323 13.3 17.5 16.8 1060 Example 3 350 327 13.7 17.5 17.0 1092 Example 4 354 333 14.0 18.0 17.5 1115 Example 5 360 338 14.2 18.0 17.6 1132 Comparative Example 1 312 300 12.4 15.5 14.9 978 Comparative Example 2 324 310 11.8 16.0 15.5 992

[0072] As can be seen from Table 1, the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames involved in the embodiment of the present invention has higher tensile strength, toughness, hardness, corrosion resistance and fatigue resistance than the comparative product; the combined use of rare earth elements, Ta, homogenization treatment and solution treatment steps is beneficial to improving the above properties.

[0073] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames, characterized in that: The chemical composition includes, by mass percentage, Si 0.7%-0.9%, Fe≤0.16%, Cu≤0.01%, Mn 0.3%-0.5%, Mg 0.6%-0.8%, Cr≤0.03%, Zn≤0.05%, Ti≤0.05%, and the balance is Al and other inevitable impurities.

2. The 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 1 is characterized in that: The mass percentage of the other inevitable impurities is ≤0.05%.

3. The 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 1 is characterized in that: The chemical composition of the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames also includes the following components in percentage by mass: rare earth elements 0.01%-0.03%, Nb≤0.02%, B 0.001%-0.003%, Sr≤0.01%, Ta 0.005%-0.015%, Hf≤0.01%.

4. The 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 3 is characterized in that: The rare earth elements are Sc, Y and Pr mixed in a mass ratio of 1:(0.8-1.2):(1-2).

5. A method for preparing a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame according to any one of claims 3-4, characterized in that: The steps include: Step S1, using Al, Al-Si master alloy, Al-Fe master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Mg master alloy, Al-Cr master alloy, Al-Zn master alloy, Al-Ti master alloy, Al-rare earth element master alloy, Al-Nb master alloy, Al-B master alloy, Al-Sr master alloy, Al-Ta master alloy and Al-Hf master alloy as raw materials, weighing each raw material according to mass percentage, adding the raw materials into a smelting furnace for smelting, and then performing refining, deslagging and degassing treatment to obtain molten metal; Step S2, casting the refined molten metal into a round ingot, heating it to 480-500° C. after homogenization treatment, and extruding it to obtain a profile of a desired shape; Step S3, subjecting the profile processed in step S2 to T6 heat treatment to obtain a 6005C high-strength and lightweight aluminum alloy profile for a photovoltaic frame.

6. The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 5, characterized in that: The smelting temperature in step S1 is 720-760°C.

7. The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 5, characterized in that: The temperature of the uniform post-treatment in step S2 is 540-560° C. and the time is 6-8 hours.

8. The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 5, characterized in that: The T6 heat treatment in step S3 includes solution treatment and artificial aging treatment.

9. The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 8, characterized in that: The temperature of the solution treatment is 530-550° C., the holding time is 1-2 hours, and the solution is quenched in water.

10. The method for preparing the 6005C high-strength and lightweight aluminum alloy profile for photovoltaic frames according to claim 8, characterized in that: The temperature of the artificial aging treatment is 160-180° C., and the insulation time is 5-7 hours.