Preparation process of an aluminum alloy material for a sports equipment

Abstract

The present invention discloses a preparation process of an aluminum alloy material for sports equipment, which relates to the technical field of aluminum alloys. When preparing the aluminum alloy material for sports equipment in the present invention, nickel is loaded onto graphene oxide by an in-situ co-reduction method to obtain nickel-plated graphene; the nickel-plated graphene and aluminum powder are made into a graphene-aluminum master alloy by a pressure infiltration process; rare earth lanthanum and aluminum blocks are melted and mixed to obtain a rare earth-aluminum master alloy; A380 aluminum alloy, graphene-aluminum master alloy, and rare earth-aluminum master alloy are cast and formed to obtain a modified aluminum alloy; acrylamide, sodium silicate, an oxidizing agent, and a reducing agent are formulated into a chemical conversion treatment solution; the modified aluminum alloy is subjected to chemical conversion treatment with the chemical conversion treatment solution to obtain the aluminum alloy material for sports equipment. The aluminum alloy material for sports equipment prepared by the present invention has excellent corrosion resistance and mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloys, and specifically to a preparation process of an aluminum alloy material for sports equipment. Background Art

[0002] In recent years, people have paid more attention to health and sports activities, and the demand for sports equipment has increased and become more diversified accordingly. In addition to traditional fitness equipment, the demand for outdoor sports equipment, team sports equipment, and children's sports equipment has been increasing day by day. As a result, personalized needs and customized products have occupied a place in the sports equipment market. With the progress of technology and the change of user needs, sports equipment not only needs to meet basic functional requirements but also needs to have higher performance and innovative designs. The characteristics of metal materials, such as strength, durability, stability, and plasticity, provide reliable structures and supports for sports equipment.

[0003] Aluminum alloy is a material formed by mixing aluminum with other alloying elements. Aluminum alloy has a lower density and a lighter mass compared to other metal materials. Therefore, aluminum alloy equipment is more convenient to carry and operate. Aluminum alloy also has good processing properties and can be processed into various shapes and structures through various processes such as extrusion, casting, and welding to meet the design requirements of different sports equipment. When used as sports equipment, aluminum alloy also has defects such as easy corrosion and insufficient strength, making it difficult to meet the increasingly diverse usage scenarios of sports equipment. Therefore, a preparation process of an aluminum alloy material for sports equipment is proposed. The aluminum alloy material prepared by this process has excellent corrosion resistance and mechanical properties, greatly improving the comprehensive performance of aluminum alloy, expanding the usage scenarios of aluminum alloy as sports equipment, and having great prospects and value. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation process of an aluminum alloy material for sports equipment to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A preparation process of an aluminum alloy material for sports equipment, wherein the preparation process of the aluminum alloy material for sports equipment is to prepare a graphene-aluminum intermediate alloy by a pressure infiltration process using nickel-plated graphene and aluminum powder; cast A380 aluminum alloy, graphene-aluminum intermediate alloy, and rare earth-aluminum intermediate alloy to form a modified aluminum alloy; and perform chemical conversion treatment on the modified aluminum alloy with a chemical conversion treatment solution to obtain an aluminum alloy material for sports equipment;

[0007] The nickel-plated graphene is prepared by in-situ co-reduction method to load nickel onto graphene oxide;

[0008] The rare earth-aluminum master alloy is obtained by melting and mixing rare earth lanthanum and aluminum blocks;

[0009] The chemical conversion treatment solution is prepared by mixing acrylamide, sodium silicate, an oxidizing agent, and a reducing agent;

[0010] The oxidizing agent is one of potassium persulfate and ammonium persulfate;

[0011] The reducing agent is one of sodium sulfite, sodium bisulfite, and ammonium ferrous sulfate.

[0012] As an optimization, the preparation process of the aluminum alloy material for sports equipment includes the following preparation steps:

[0013] (1) Stir the mixed reaction solution at 80-90 °C and 300-500 r / min. Use a pH test paper to detect the pH value of the mixed solution every 5 minutes, and add ammonia water to keep the pH value of the mixed solution stable at 9-10. Stop adding ammonia water after 15 minutes. Stop heating after stirring for 30 minutes, cool to room temperature, filter by suction, wash with deionized water 3-5 times, dry at 50-60 °C under vacuum for 10-12 hours, place in a ball mill, and ball mill at 500-600 rpm for 20-24 hours to obtain nickel-plated graphene; Mix the nickel-plated graphene and aluminum powder evenly according to a mass ratio of 1:(20-30), place in a powder mixer, stir and mix at 300-500 r / min for 14-16 hours, cold press at 10-20 MPa, place in a high-temperature electric furnace, keep warm at 600-700 °C for 4-6 hours, pour at 700-800 °C, keep the pressure for 10-20 minutes, and demold to obtain graphene-aluminum master alloy;

[0014] (2) Under argon protection, place the A380 aluminum alloy in a graphite crucible, heat to 730-750 °C. After the A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy 0.2-0.3 times the mass of the A380 aluminum alloy and a rare earth-aluminum master alloy 0.06-0.07 times the mass of the A380 aluminum alloy. Stir at 730-750 °C and 300-500 r / min for 30-40 minutes and keep warm for 50-60 minutes. Lower the melt temperature to 690-710 °C, refine and remove slag from the melt, and pour in a metal mold to obtain a modified aluminum alloy;

[0015] (3) Immerse the modified aluminum alloy in the chemical conversion treatment solution, ultrasonically vibrate at 70-80 °C for 30-36 hours, take out, wash with anhydrous ethanol and deionized water 3-5 times each, and dry at 50-60 °C under vacuum for 10-12 hours to obtain the aluminum alloy material for sports equipment.

[0016] As an optimization, the preparation method of the mixed reaction solution in step (1) is as follows: Mix nickel sulfate, trisodium citrate hexahydrate, ammonium chloride, sodium hypophosphite, and deionized water in a mass ratio of 1:(2.5 - 2.6):(1.5 - 1.6):(0.5 - 0.6):(20 - 30) evenly, add an aqueous graphene solution that is 4 - 5 times the mass of nickel sulfate, and adjust the pH to 9 - 10 with ammonia water to obtain the mixed reaction solution.

[0017] As an optimization, the preparation method of the aqueous graphene solution is as follows: Mix graphene oxide and deionized water in a mass ratio of 1:(20 - 30) evenly, and ultrasonically disperse for 1 - 2 h to obtain the aqueous graphene solution.

[0018] As an optimization, the preparation method of the rare earth-aluminum master alloy in step (2) is as follows: Mix rare earth lanthanum and aluminum blocks in a mass ratio of 1:(10 - 12), heat up to 730 - 750 °C to melt rare earth lanthanum and aluminum blocks, stir at 730 - 750 °C and 300 - 500 r / min for 20 - 30 min, and keep warm for 50 - 60 min. Lower the melt temperature to 690 - 710 °C, refine and slag-remove the melt, pour it in a metal mold, and cool to room temperature to obtain the rare earth-aluminum master alloy.

[0019] As an optimization, the preparation method of the chemical conversion treatment solution in step (3) is as follows: Under nitrogen protection, mix acrylamide, an oxidant, a reductant, and deionized water in a mass ratio of 1:(0.03 - 0.05):(0.004 - 0.006):(90 - 100) evenly, add sodium silicate that is 0.2 - 0.3 times the mass of acrylamide, and mix evenly to obtain the chemical conversion treatment solution.

[0020] As an optimization, the oxidant is one of potassium persulfate and ammonium persulfate.

[0021] As an optimization, the reductant is one of sodium sulfite, sodium bisulfite, and ammonium ferrous sulfate.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0023] When preparing the aluminum alloy material for sports equipment, the present invention uses the in-situ co-reduction method to load nickel onto graphene oxide to obtain nickel-plated graphene; uses the pressure infiltration process to prepare a graphene-aluminum master alloy from nickel-plated graphene and aluminum powder; melts and mixes rare earth lanthanum and aluminum blocks to obtain a rare earth-aluminum master alloy; casts A380 aluminum alloy, graphene-aluminum master alloy, and rare earth-aluminum master alloy to form a modified aluminum alloy; formulates a chemical conversion treatment solution from acrylamide, sodium silicate, an oxidant, and a reductant; and performs chemical conversion treatment on the modified aluminum alloy with the chemical conversion treatment solution to obtain the aluminum alloy material for sports equipment.

[0024] First, nickel is loaded onto graphene oxide by in-situ co-reduction method to obtain nickel-plated graphene; nickel-plated graphene and aluminum powder are used to prepare graphene-aluminum master alloy by pressure infiltration process; graphene can strengthen the aluminum alloy material for sports equipment from three aspects. One is fine grain strengthening. The thermal expansion coefficient of graphene nanosheets is lower than that of the metal matrix, so graphene nanosheets can effectively hinder the grain growth of the metal matrix. The second is dislocation pinning. During the plastic deformation of the aluminum alloy material for sports equipment, graphene will pin the dislocations at the grain boundaries, thus hindering the dislocation movement. The third is load strengthening. During the plastic deformation of the aluminum alloy material for sports equipment, due to the special wrinkled structure of graphene, it can help the metal matrix bear part of the load, thus improving the mechanical properties of the aluminum alloy material for sports equipment. Although graphene has excellent strengthening effect on aluminum alloy materials in theory, a large number of research results show that there are problems such as weak interfacial bonding force and non-wetting between graphene and metallic aluminum, resulting in a low interfacial bonding force between graphene and aluminum, and the strengthening effect of graphene cannot be fully exerted. The binding force between nickel element and graphene is strong. Therefore, by using in-situ co-reduction method to load nickel element on the surface of graphene, the interfacial wettability between graphene and aluminum can be effectively improved, and at the same time, the thermal expansion of the interface can be reduced, so as to form a stable interfacial bond and fully exert the strengthening effect of graphene on aluminum alloy, endowing the aluminum alloy material for sports equipment with excellent mechanical properties.

[0025] Secondly, rare earth lanthanum and aluminum ingots are melted and mixed to prepare rare earth-aluminum master alloy; A380 aluminum alloy, graphene-aluminum master alloy and rare earth-aluminum master alloy are cast and formed to obtain modified aluminum alloy; A380 alloy is mainly composed of α-A1, Si, β-Al 5 FeSi and Al 2 Cu. Relevant research shows that the higher the Si content, the worse the corrosion resistance of the aluminum alloy material. During the corrosion process, the large-sized eutectic Si phase and β-Al 5 FeSi phase in A380 aluminum alloy will form a corrosion microcell with the anode phase α-A1, and corrosion holes will be formed near the second phase after corrosion. When the Si phase exists in the form of thick and long needles in the aluminum-silicon alloy matrix, it is not only not conducive to its mechanical properties, but also the larger area of the cathode phase will undergo more serious corrosion. The addition of rare earth lanthanum hinders the diffusion of elements (such as Si, Fe, etc.), and the long needle-shaped eutectic Si phase becomes short rod-shaped or granular, and the morphology and size of the β-Al 5 FeSi phase also change significantly, becoming finer short rod-shaped; after adding rare earth lanthanum to the aluminum alloy, the average grain size decreases, the occurrence of micro-galvanic corrosion is reduced, and the corrosion resistance of the aluminum alloy material for sports equipment is improved; at the same time, the formation of high melting point and high strength rare earth phases such as Al 11 La 3 makes the mechanical properties of the aluminum alloy material for sports equipment further improved.

[0026] Finally, acrylamide, sodium silicate, an oxidizing agent, and a reducing agent are formulated into a chemical conversion treatment solution; the modified aluminum alloy is chemically converted with the chemical conversion treatment solution to obtain an aluminum alloy material for sports equipment; sodium silicate can form a precipitation film on the surface of the aluminum alloy, and polyacrylamide, as an organic substance, can adsorb on the surface of the aluminum alloy in the voids of the precipitation film formed by sodium silicate to form an adsorption film, making the film layer denser; at the same time, polyacrylamide can also coat the surface of the sodium silicate precipitation film and wrap part of the unformed sodium silicate. When pitting causes the film layer to rupture, these sodium silicates can be released and form a precipitate with the metal cations enriched at the pitting pits, thereby playing a self-repairing role; the two different film-forming substances complement each other to form a chemical conversion film with better corrosion resistance than single sodium silicate or acrylamide, showing good long-term corrosion resistance and endowing the aluminum alloy material for sports equipment with excellent corrosion resistance. Specific embodiments

[0027] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0028] A preparation process for an aluminum alloy material for sports equipment, the preparation process for the aluminum alloy material for sports equipment includes the following preparation steps:

[0029] (1) Graphene oxide and deionized water are mixed evenly at a mass ratio of 1:20 and ultrasonically dispersed for 1 h to obtain a graphene aqueous solution; nickel sulfate, trisodium citrate hexahydrate, ammonium chloride, sodium hypophosphite, and deionized water are mixed evenly at a mass ratio of 1:2.5:1.5:0.5:20, and the graphene aqueous solution 4 times the mass of nickel sulfate is added, and the pH is adjusted to 9 with ammonia water to obtain a mixed reaction solution; the mixed reaction solution is stirred at 80 °C and 300 r / min, and the pH value of the mixed solution is detected with a pH test paper every 5 min, and ammonia water is added dropwise to keep the pH value of the mixed solution stable at 9. After 15 min, ammonia water is no longer added dropwise. After stirring for 30 min, heating is stopped, cooled to room temperature, filtered by suction, washed 3 times with deionized water, dried at 50 °C for 12 h under vacuum conditions, placed in a ball mill, and ball milled at 500 rpm for 24 h to obtain nickel-plated graphene; the nickel-plated graphene and aluminum powder are mixed evenly at a mass ratio of 1:20, placed in a powder mixer, stirred and mixed at 300 r / min for 16 h, cold pressed into a mold at 10 MPa, placed in a high-temperature electric furnace, kept at 600 °C for 6 h, cast at 700 °C, and the pressure is maintained for 10 min, and then demolded to obtain a graphene-aluminum master alloy;

[0030] (2) Mix rare earth lanthanum and aluminum blocks in a mass ratio of 1:10, heat up to 730 °C to melt the rare earth lanthanum and aluminum blocks. At 730 °C, stir at 300 r / min for 30 min and keep warm for 60 min. Lower the melt temperature to 690 °C, refine and slag-remove the melt, and cast it in a metal mold. Cool to room temperature to obtain a rare earth-aluminum master alloy. Under argon protection, place A380 aluminum alloy in a graphite crucible, heat it to 730 °C. After the A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy that is 0.2 times the mass of the A380 aluminum alloy and a rare earth-aluminum master alloy that is 0.06 times the mass of the A380 aluminum alloy. Stir at 730 °C and 300 r / min for 40 min and keep warm for 60 min. Lower the melt temperature to 690 °C, refine and slag-remove the melt, and cast it in a metal mold to obtain a modified aluminum alloy;

[0031] (3) Under nitrogen protection, mix acrylamide, potassium persulfate, sodium sulfite, and deionized water in a mass ratio of 1:0.03:0.004:90 evenly, add sodium silicate that is 0.2 times the mass of acrylamide, and mix evenly to obtain a chemical conversion treatment solution. Immerse the modified aluminum alloy in the chemical conversion treatment solution, ultrasonically vibrate at 70 °C for 36 h, take it out, wash it 3 times each with absolute ethanol and deionized water, and dry it at 50 °C for 12 h under vacuum conditions to obtain an aluminum alloy material for sports equipment. Example

[0032] A preparation process of an aluminum alloy material for sports equipment, the preparation process of the aluminum alloy material for sports equipment includes the following preparation steps:

[0033] (1) Mix graphene oxide and deionized water evenly at a mass ratio of 1:25, and ultrasonically disperse for 1.5 h to obtain an aqueous graphene solution; mix nickel sulfate, trisodium citrate hexahydrate, ammonium chloride, sodium hypophosphite, and deionized water evenly at a mass ratio of 1:2.55:1.55:0.55:25, add an aqueous graphene solution 4.5 times the mass of nickel sulfate, and adjust the pH to 9.5 with ammonia water to obtain a mixed reaction solution; stir the mixed reaction solution at 85 °C and 400 r / min, detect the pH value of the mixed solution with a pH test paper every 5 min, and dropwise add ammonia water to keep the pH value of the mixed solution stable at 9.5. After 15 min, stop dropping ammonia water. After stirring for 30 min, stop heating, cool to room temperature, filter by suction, wash 4 times with deionized water, dry at 55 °C for 11 h under vacuum conditions, place in a ball mill, and ball mill at 550 rpm for 22 h to obtain nickel-plated graphene; mix nickel-plated graphene and aluminum powder evenly at a mass ratio of 1:25, place in a powder mixer, stir and mix at 400 r / min for 15 h, cold press at 15 MPa, place in a high-temperature electric furnace, keep warm at 650 °C for 5 h, pour at 750 °C, keep the pressure for 15 min, and demold to obtain a graphene-aluminum master alloy;

[0034] (2) Mix rare earth lanthanum and aluminum block at a mass ratio of 1:11, heat up to 740 °C to melt rare earth lanthanum and aluminum block, stir at 740 °C and 400 r / min for 25 min, and keep warm for 55 min. Lower the melt temperature to 700 °C, refine and remove slag from the melt, pour in a metal mold, and cool to room temperature to obtain a rare earth-aluminum master alloy; under argon protection, place A380 aluminum alloy in a graphite crucible, heat to 740 °C, after A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy 0.25 times the mass of A380 aluminum alloy and a rare earth-aluminum master alloy 0.065 times the mass of A380 aluminum alloy, stir at 740 °C and 400 r / min for 35 min and keep warm for 55 min, lower the melt temperature to 700 °C, refine and remove slag from the melt, and pour in a metal mold to obtain a modified aluminum alloy;

[0035] (3) Under nitrogen protection, mix acrylamide, potassium persulfate, sodium sulfite, and deionized water evenly at a mass ratio of 1:0.04:0.005:95, add sodium silicate 0.25 times the mass of acrylamide, and mix evenly to obtain a chemical conversion treatment solution; immerse the modified aluminum alloy in the chemical conversion treatment solution, ultrasonically oscillate at 75 °C for 33 h, take out, wash 4 times with anhydrous ethanol and deionized water respectively, dry at 55 °C for 11 h under vacuum conditions to obtain an aluminum alloy material for sports equipment. Example

[0036] A preparation process of an aluminum alloy material for sports equipment, the preparation process of the aluminum alloy material for sports equipment includes the following preparation steps:

[0037] (1) Mix graphene oxide and deionized water evenly at a mass ratio of 1:30, and ultrasonically disperse for 2 h to obtain an aqueous graphene solution; mix nickel sulfate, trisodium citrate hexahydrate, ammonium chloride, sodium hypophosphite, and deionized water evenly at a mass ratio of 1:2.6:1.6:0.6:30, add an aqueous graphene solution 5 times the mass of nickel sulfate, adjust the pH to 10 with ammonia water to obtain a mixed reaction solution; stir the mixed reaction solution at 90 °C and 500 r / min, detect the pH value of the mixed solution with pH test paper every 5 min, and dropwise add ammonia water to keep the pH value of the mixed solution stable at 10. Stop dropping ammonia water after 15 min, stop heating after stirring for 30 min, cool to room temperature, filter by suction, wash 5 times with deionized water, dry in vacuum at 60 °C for 10 h, place in a ball mill, and ball mill at 600 rpm for 20 h to obtain nickel-plated graphene; mix nickel-plated graphene and aluminum powder evenly at a mass ratio of 1:30, place in a powder mixer, stir and mix at 500 r / min for 14 h, cold press at 20 MPa, place in a high-temperature electric furnace, keep warm at 700 °C for 4 h, pour at 800 °C, keep the pressure for 20 min, and demold to obtain a graphene-aluminum master alloy;

[0038] (2) Mix rare earth lanthanum and aluminum block at a mass ratio of 1:12, heat up to 750 °C to melt rare earth lanthanum and aluminum block, stir at 750 °C and 500 r / min for 20 min, and keep warm for 50 min. Lower the melt temperature to 710 °C, refine and remove slag from the melt, pour in a metal mold, and cool to room temperature to obtain a rare earth-aluminum master alloy; under argon protection, place A380 aluminum alloy in a graphite crucible, heat to 750 °C, after A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy 0.3 times the mass of A380 aluminum alloy and a rare earth-aluminum master alloy 0.07 times the mass of A380 aluminum alloy, stir at 750 °C and 500 r / min for 30 min and keep warm for 50 min, lower the melt temperature to 710 °C, refine and remove slag from the melt, and pour in a metal mold to obtain a modified aluminum alloy;

[0039] (3) Under nitrogen protection, mix acrylamide, potassium persulfate, sodium sulfite, and deionized water evenly at a mass ratio of 1:0.05:0.006:100, add sodium silicate 0.3 times the mass of acrylamide, and mix evenly to obtain a chemical conversion treatment solution; immerse the modified aluminum alloy in the chemical conversion treatment solution, ultrasonically vibrate at 80 °C for 30 h, take out, wash 5 times with anhydrous ethanol and deionized water respectively, dry in vacuum at 60 °C for 10 h to obtain an aluminum alloy material for sports equipment.

[0040] Comparative Example 1

[0041] The preparation process of the aluminum alloy material for sports equipment in Comparative Example 1 is different from that in Example 2 in step (1). Modify step (1) as follows: Mix graphene oxide and aluminum powder evenly at a mass ratio of 1:25, place them in a powder mixer, stir and mix at 400 r / min for 15 h, cold press at 15 MPa, place in a high-temperature electric furnace, keep warm at 650 °C for 5 h, pour at 750 °C, keep the pressure for 15 min, and demold to obtain the graphene-aluminum master alloy. The remaining steps are the same as those in Example 2.

[0042] Comparative Example 2

[0043] The preparation process of the aluminum alloy material for sports equipment in Comparative Example 2 is different from that in Example 2 in step (2). Modify step (2) as follows: Under argon protection, place A380 aluminum alloy in a graphite crucible, heat to 740 °C, and after the A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy with a mass 0.25 times that of the A380 aluminum alloy. Stir at 740 °C and 400 r / min for 35 min and keep warm for 55 min. Lower the melt temperature to 700 °C, refine and remove slag from the melt, and pour in a metal mold to obtain the modified aluminum alloy. The remaining steps are the same as those in Example 2.

[0044] Comparative Example 3

[0045] The preparation process of the aluminum alloy material for sports equipment in Comparative Example 3 is different from that in Example 2 in that step (3) is not carried out. Modify step (2) as follows: Mix rare earth lanthanum and aluminum blocks at a mass ratio of 1:11, heat up to 740 °C to melt the rare earth lanthanum and aluminum blocks, stir at 740 °C and 400 r / min for 25 min, and keep warm for 55 min. Lower the melt temperature to 700 °C, refine and remove slag from the melt, and pour in a metal mold, and cool to room temperature to obtain the rare earth-aluminum master alloy; Under argon protection, place A380 aluminum alloy in a graphite crucible, heat to 740 °C, and after the A380 aluminum alloy is completely melted, add a graphene-aluminum master alloy with a mass 0.25 times that of the A380 aluminum alloy and a rare earth-aluminum master alloy with a mass 0.065 times that of the A380 aluminum alloy. Stir at 740 °C and 400 r / min for 35 min and keep warm for 55 min. Lower the melt temperature to 700 °C, refine and remove slag from the melt, and pour in a metal mold to obtain the aluminum alloy material for sports equipment. The remaining steps are the same as those in Example 2.

[0046] Test Example 1

[0047] Testing of mechanical properties

[0048] Test method: According to GB / T 228, the examples and comparative examples were prepared into standard specimens, and a universal electronic tensile testing machine was used to test the tensile strength of the examples and comparative examples, with the tensile rate set at 0.05 mm / min. The results are shown in Table 1.

[0049] Table 1

[0050] Tensile strength (MPa) Tensile strength (MPa) Example 1 379.23 Comparative Example 1 244.17 Example 2 384.52 Comparative Example 2 257.83 Example 3 381.15 Comparative Example 3 375.92

[0051] From the comparison of the experimental data of Examples 1-3 and Comparative Examples 1-3 in Table 1, it can be found that the aluminum alloy material for sports equipment prepared by the present invention has good mechanical properties.

[0052] By comparison, the tensile strength of Examples 1-3 is greater than that of Comparative Example 1, indicating that nickel was loaded onto graphene oxide by in-situ co-reduction method to obtain nickel-plated graphene; the nickel-plated graphene and aluminum powder were used to prepare graphene-aluminum master alloy by pressure infiltration process; graphene can strengthen the aluminum alloy material for sports equipment from three aspects. One is grain refinement strengthening. The thermal expansion coefficient of graphene nanosheets is lower than that of the metal matrix, so graphene nanosheets can effectively hinder the grain growth of the metal matrix. The second is dislocation pinning. During the plastic deformation process of the aluminum alloy material for sports equipment, graphite will play a pinning role on dislocations at the grain boundaries, thus hindering the movement of dislocations. The third is load strengthening. During the plastic deformation process of the aluminum alloy material for sports equipment, due to the special wrinkled structure of graphene, it can help the metal matrix bear part of the load, thereby improving the mechanical properties of the aluminum alloy material for sports equipment. Although graphene has excellent strengthening effect on aluminum alloy materials in theory, a large number of research results show that there are problems such as weak interfacial bonding force and non-wetting between graphene and metallic aluminum, resulting in a low interfacial bonding force between graphene and aluminum, and the strengthening effect of graphene cannot be fully exerted; the binding force between nickel element and graphene is strong. Therefore, by using the in-situ co-reduction method to load nickel element on the surface of graphene, the interfacial wettability between graphene and aluminum can be effectively improved, and at the same time, the thermal expansion of the interface can be reduced, so as to form a stable interfacial bond and fully exert the strengthening effect of graphene on aluminum alloy, endowing the aluminum alloy material for sports equipment with excellent mechanical properties.

[0053] By comparison, the tensile strength of Examples 1-3 is greater than that of Comparative Example 2, indicating that rare earth lanthanum and aluminum blocks were melted and mixed to prepare rare earth-aluminum master alloy; A380 aluminum alloy, graphene-aluminum master alloy, and rare earth-aluminum master alloy were cast and formed to obtain modified aluminum alloy; A380 alloy is mainly composed of α-A1, Si, β-Al 5 FeSi and Al 2 Cu as the main phases, and the addition of rare earth lanthanum hinders the diffusion of elements (such as Si, Fe, etc.), and the long needle-like eutectic Si phase becomes short rod-like or granular, β-Al 5The morphology and size of the FeSi phase also change significantly, becoming finer short rod shapes; after adding rare earth lanthanum to the aluminum alloy, the average grain size decreases, and at the same time, rare earth phases such as 11 La 3 with high melting points and high strengths are formed, further improving the mechanical properties of the aluminum alloy material for sports equipment.

[0054] Test Example 2

[0055] Test of corrosion resistance

[0056] Test method: The corrosion resistance of the examples and comparative examples was tested by electrochemical impedance spectroscopy. Using a Gamry Interface 1000 electrochemical workstation, the examples and comparative examples were used as the working electrodes, with a working area of 1 cm 2 , a platinum electrode as the counter electrode, and a saturated calomel electrode as the reference electrode. The open circuit potential was measured in a 3.5% NaCl solution with this three-electrode system for 1800 s. After the open circuit potential was stable, it indicated that the system reached a steady state, and then the electrochemical impedance was measured. The parameter settings were an amplitude of 10 mV and a frequency range from 100 kHz to 0.01 Hz. The results are shown in Table 2.

[0057] Table 2

[0058]

[0059] From the comparison of the experimental data of Examples 1 - 3 and Comparative Examples 1 - 3 in Table 2, it can be found that the aluminum alloy material for sports equipment prepared by the present invention has good corrosion resistance.

[0060] By comparison, the charge transfer resistance of Examples 1 - 3 is greater than that of Comparative Example 2, indicating that rare earth-aluminum master alloy was prepared by melting and mixing rare earth lanthanum and aluminum ingots; the modified aluminum alloy was prepared by casting A380 aluminum alloy, graphene-aluminum master alloy, and rare earth-aluminum master alloy; A380 alloy mainly consists of α-A1, Si, β-Al 5 FeSi and Al 2 Cu as the main phases. Relevant research shows that the higher the Si content, the worse the corrosion resistance of the aluminum alloy material. During corrosion, the large-sized eutectic Si phase and β-Al 5 FeSi phase in the A380 aluminum alloy will form a corrosion microcell with the anodic phase α-A1. After corrosion, corrosion pits are formed near the second phase. When the Si phase exists as thick and long needles in the aluminum-silicon alloy matrix, it is not only unfavorable for its mechanical properties, but also the relatively large cathode area will undergo more serious corrosion. The addition of rare earth lanthanum hinders the diffusion of elements (such as Si, Fe, etc.), and the long needle-shaped eutectic Si phase becomes short rod-shaped or granular, β-Al 5The morphology and size of the FeSi phase also change significantly, becoming finer short rod-like shapes; after adding rare earth lanthanum to the aluminum alloy, the average grain size decreases, reducing the occurrence of micro-galvanic corrosion and improving the corrosion resistance of the aluminum alloy material for sports equipment.

[0061] By comparison, the charge transfer resistance of Examples 1 to 3 is greater than that of Comparative Example 3, indicating that acrylamide, sodium silicate, oxidant, and reductant are formulated into a chemical conversion treatment solution; the modified aluminum alloy is chemically converted with the chemical conversion treatment solution to obtain an aluminum alloy material for sports equipment; sodium silicate can form a precipitation film on the surface of the aluminum alloy, and polyacrylamide, as an organic substance, can adsorb on the surface of the aluminum alloy in the voids of the precipitation film formed by sodium silicate to form an adsorption film, making the film layer more dense; at the same time, polyacrylamide can also coat the surface of the sodium silicate precipitation film and wrap part of the unformed sodium silicate. When pitting causes the film layer to rupture, these sodium silicates can be released and form precipitates with the metal cations enriched at the pitting pits, thus playing a self-repairing role; the two different film-forming substances complement each other, generating a chemical conversion film with better corrosion resistance than single sodium silicate or acrylamide, showing good long-term corrosion resistance and endowing the aluminum alloy material for sports equipment with excellent corrosion resistance.

[0062] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing an aluminum alloy material for sports equipment, characterized in that: The preparation process of the aluminum alloy material for sports equipment is to prepare a graphene-aluminum master alloy by a pressure infiltration process with nickel-plated graphene and aluminum powder; to prepare a modified aluminum alloy by casting A380 aluminum alloy, graphene-aluminum master alloy and rare earth-aluminum master alloy; to prepare an aluminum alloy material for sports equipment by chemical conversion treatment liquid; The nickel-plated graphene is prepared by loading nickel onto graphene oxide through an in-situ co-reduction method; The rare earth-aluminum master alloy is prepared by melting and mixing rare earth lanthanum and aluminum blocks; The chemical conversion treatment liquid is prepared by mixing acrylamide, sodium silicate, an oxidizing agent and a reducing agent; The oxidant is one of potassium persulfate and ammonium persulfate; The reducing agent is one of sodium sulfite, sodium bisulfite and ammonium ferrous sulfate; The method comprises the following preparation steps: (1) Mix nickel-plated graphene and aluminum powder in a mass ratio of 1:(20-30), place in a powder mixer, stir and mix at 300-500 r / min for 14-16 h, cold press at 10-20 MPa, place in a high-temperature electric furnace, keep at 600-700°C for 4-6 h, pour at 700-800°C, keep the pressure for 10-20 min, and demold to obtain a graphene-aluminum master alloy; (2) Under argon protection, the A380 aluminum alloy is placed in a graphite crucible and heated to 730-750°C. After the A380 aluminum alloy is completely melted, 0.2-0.3 times the mass of the A380 aluminum alloy is added with a graphene-aluminum master alloy and 0.06-0.07 times the mass of the A380 aluminum alloy is added. The mixture is stirred at 730-750°C and 300-500 r / min for 30-40 min and kept warm for 50-60 min. The melt temperature is lowered to 690-710°C. The melt is refined and deslagging is performed, and then poured into a metal mold to obtain a modified aluminum alloy. (3) The modified aluminum alloy is immersed in a chemical conversion treatment solution, ultrasonically shaken at 70-80°C for 30-36 hours, taken out, washed with anhydrous ethanol and deionized water for 3-5 times respectively, and dried at 50-60°C for 10-12 hours under vacuum conditions to obtain an aluminum alloy material for sports equipment.

2. The process for preparing an aluminum alloy material for sports equipment according to claim 1, characterized in that: The preparation method of the nickel-plated graphene in step (1) is as follows: nickel sulfate, trisodium citrate hexahydrate, ammonium chloride, sodium hypophosphite, and deionized water are uniformly mixed in a mass ratio of 1:(2.5-2.6):(1.5-1.6):(0.5-0.6):(20-30), a graphene aqueous solution of 4-5 times the mass of nickel sulfate is added, and the pH is adjusted to 9-10 with ammonia water to obtain a mixed reaction solution; the mixed reaction solution is heated at 80-90°C and 300-500°C. r / min, the pH value of the mixed solution was detected with pH test paper every 5 minutes, and ammonia water was added dropwise to stabilize the pH value of the mixed solution at 9-10. No more ammonia water was added after 15 minutes. The heating was stopped after stirring for 30 minutes, and the mixture was cooled to room temperature, filtered, washed with deionized water for 3-5 times, dried at 50-60°C under vacuum conditions for 10-12 hours, placed in a ball mill, and ball-milled at 500-600rpm for 20-24 hours to obtain nickel-plated graphene.

3. The process for preparing an aluminum alloy material for sports equipment according to claim 2, characterized in that: The preparation method of the graphene aqueous solution is as follows: graphene oxide and deionized water are uniformly mixed in a mass ratio of 1:(20-30), and ultrasonically dispersed for 1-2 hours to obtain the graphene aqueous solution.

4. The process for preparing an aluminum alloy material for sports equipment according to claim 1, characterized in that: The preparation method of the rare earth-aluminum master alloy in step (2) is as follows: rare earth lanthanum and aluminum block are mixed in a mass ratio of 1:(10-12), the temperature is raised to 730-750°C to melt the rare earth lanthanum and the aluminum block, the mixture is stirred at 730-750°C and 300-500 r / min for 20-30 min, and the mixture is kept warm for 50-60 min, the temperature of the melt is reduced to 690-710°C, the melt is refined and deslagging is performed, the melt is poured into a metal mold, and the mixture is cooled to room temperature to obtain a rare earth-aluminum master alloy.

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