Antibacterial aluminum alloy and preparation method and application thereof

Abstract

The invention belongs to the technical field of antibacterial materials, and provides an antibacterial aluminum alloy and a preparation method and application thereof. The antibacterial aluminum alloy comprises the following chemical components in percentage by weight: 0.1 to 1 percent of Si, 0.45 to 0.9 percent of Mg, 0.1 to 0.9 percent of Fe, 0.1 to 0.2 percent of Mn, 0.1 to 4 percent of Ag, 0.1 to 3 percent of Zn, 0.1 to 0.3 percent of Cu, 0.1 to 30 percent of rare earth element RE and the balance of Al and inevitable impurities. On the basis of a 6063 aluminum alloy, antibacterial elements of silver, copper and rare earth elements are added, the mass percent of Zn, Cu and other elements is optimized, and the obtained antibacterial aluminum alloy has the lasting antibacterial property, and meanwhile it is guaranteed that other properties are not affected; the injection parameters of the die casting process are dynamically adjusted, so that the dynamic adjustment of the state of the die casting is realized, and the die casting quality and the yield of the antibacterial aluminum alloy are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of antibacterial materials, and in particular to an antibacterial aluminum alloy and a preparation method and application thereof. Background Art

[0002] At present, public health and safety are receiving more and more attention from people. Door handles are everywhere in almost all occasions. However, there are often a large number of bacteria and viruses on door handles, such as Escherichia coli and Staphylococcus aureus, which pose a hidden danger to public health and safety. The most common sterilization methods are spraying chemical disinfectants or irradiating ultraviolet lights. These methods are effective, but they can only have a sterilization effect in the short term and cannot guarantee long-term and lasting sterilization. Therefore, aluminum alloy materials with long-lasting antibacterial properties are urgently needed to solve this problem.

[0003] The existing antibacterial aluminum alloy achieves antibacterial effect by preparing an antibacterial coating on the surface of the aluminum alloy. For example, patent CN202110400126.8 discloses an antibacterial aluminum alloy and a preparation method, which achieves antibacterial effect by preparing a porous aluminum oxide film on the surface of the aluminum alloy and preparing an aluminum oxide coating on the porous aluminum oxide film. Although antibacterial effect can be achieved, due to the limitations of the manufacturing process, the color of the antibacterial aluminum alloy is relatively single and cannot meet the aesthetic and visual requirements of consumers; moreover, its antibacterial layer is easy to fall off, and the long-lasting antibacterial performance cannot be guaranteed.

[0004] Based on this, developing an aluminum alloy material with excellent and durable antibacterial properties has important application prospects. Summary of the invention

[0005] The purpose of the present invention is to provide an antibacterial aluminum alloy and a preparation method and application thereof in view of the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The invention provides an antibacterial aluminum alloy. The chemical composition of the antibacterial aluminum alloy is, by weight percentage, 0.1-1% Si, 0.45-0.9% Mg, 0.1-0.9% Fe, 0.1-0.2% Mn, 0.1-4% Ag, 0.1-3% Zn, 0.1-0.3% Cu, 0.1-30% rare earth element RE, and the balance is Al and inevitable impurities.

[0008] Preferably, the rare earth elements RE include cerium, lanthanum and neodymium, and the mass ratio of cerium, lanthanum and neodymium is 1:1-5:1-2.

[0009] The present invention also provides a method for preparing the antibacterial aluminum alloy, comprising the following steps:

[0010] 1) smelting pure aluminum, aluminum-silicon master alloy, aluminum-magnesium master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy, aluminum-copper master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy to obtain a mixed aluminum liquid;

[0011] 2) Die-casting the mixed aluminum liquid to obtain a die-casting embryo;

[0012] 3) The die-casting embryo is shot peened and heat treated in sequence to obtain the antibacterial aluminum alloy.

[0013] Preferably, the smelting temperature in step 1) is 680-750° C., and the smelting time is 0.5-4 h.

[0014] Preferably, the die casting in step 2) includes a first die casting and a second die casting, and when the mass of the mixed aluminum liquid in the die casting mold reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the second die casting is performed until the die casting is completed;

[0015] The first die casting has a pressure flow rate of 1.8-2.0 m / s, a pressure of 45-50 MPa, and a temperature of 650-700° C.;

[0016] The second die casting has a pressure flow rate of 0.8-1.0 m / s, a pressure of 60-70 MPa, and a temperature of 750-800°C.

[0017] Preferably, the medium used for shot peening in step 3) is steel shot, the diameter of the medium is 0.2-0.3 mm, the rotation speed of shot peening is 1000-1500 r / min, and the shot peening time is 200-500 s.

[0018] Preferably, the heat treatment in step 3) comprises solution treatment, quenching treatment and aging treatment performed sequentially.

[0019] Preferably, the temperature of the solution treatment is 530-550°C, and the time of the solution treatment is 2-60h;

[0020] The medium used in the quenching treatment is water, the temperature of the water is 20-25° C., and the quenching treatment time is 6-10 seconds.

[0021] Preferably, the temperature of the aging treatment is 170-210° C., and the time of the aging treatment is 2-60 hours.

[0022] The invention also provides application of the antibacterial aluminum alloy in door handles.

[0023] The beneficial effects of the present invention include the following:

[0024] 1) On the basis of 6063 aluminum alloy, the present invention adds antibacterial elements silver, copper and rare earth elements, and optimizes the mass percentage of elements such as Zn and Cu, and prepares the antibacterial aluminum alloy through die-casting process and heat treatment process. The antibacterial aluminum alloy has long-lasting antibacterial properties, while ensuring that other properties of the aluminum alloy are not affected, and can maintain the original mechanical properties, corrosion resistance, cutting performance and casting performance, meeting the performance requirements of antibacterial aluminum alloys in many fields.

[0025] 2) The present invention dynamically adjusts the die-casting injection parameters of the die-casting process of the mixed aluminum liquid, thereby achieving dynamic adjustment of the state of the die-casting in the die-casting mold, reducing local defects of the die-casting, and effectively improving the die-casting quality and yield rate of the antibacterial aluminum alloy. DETAILED DESCRIPTION

[0026] The invention provides an antibacterial aluminum alloy. The chemical composition of the antibacterial aluminum alloy is, by weight percentage, 0.1-1% Si, 0.45-0.9% Mg, 0.1-0.9% Fe, 0.1-0.2% Mn, 0.1-4% Ag, 0.1-3% Zn, 0.1-0.3% Cu, 0.1-30% rare earth element RE, and the balance is Al and inevitable impurities.

[0027] In the present invention, the chemical composition of the antibacterial aluminum alloy is as follows, by weight percentage: Si 0.1-1%, preferably 0.2-0.8%, more preferably 0.4-0.6%; Mg 0.45-0.9%, preferably 0.5-0.8%, more preferably 0.6-0.7%; Fe 0.1-0.9%, preferably 0.3-0.6%, more preferably 0.4-0.5%; Mn 0.1-0.2%, preferably 0.12-0.18%, more preferably 0.15%; Ag 0.1-4%, preferably 0.5-3%, more preferably 1-2.5%, more preferably 1.5-2%; Zn 0.1-3%, preferably 0.5-2.5%, more preferably 1-2%, more preferably 1.5%; Cu 0.1-0.3%, preferably 0.15-0.25%, more preferably 0.2%; rare earth element RE 0.1 to 30%, preferably 0.3 to 25%, more preferably 1 to 15%, and even more preferably 5 to 10%; the remainder is Al and unavoidable impurities.

[0028] In the present invention, the rare earth element RE preferably includes cerium, lanthanum and neodymium, and the mass ratio of cerium, lanthanum and neodymium is preferably 1:1-5:1-2, more preferably 1:2-4:1.2-1.8, and more preferably 1:3:1.5.

[0029] The present invention also provides a method for preparing the antibacterial aluminum alloy, comprising the following steps:

[0030] 1) smelting pure aluminum, aluminum-silicon master alloy, aluminum-magnesium master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy, aluminum-copper master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy to obtain a mixed aluminum liquid;

[0031] 2) Die-casting the mixed aluminum liquid to obtain a die-casting embryo;

[0032] 3) The die-casting embryo is shot peened and heat treated in sequence to obtain the antibacterial aluminum alloy.

[0033] In the present invention, the smelting temperature in step 1) is preferably 680-750°C, more preferably 700-730°C, and more preferably 710-720°C; the smelting time is preferably 0.5-4h, more preferably 1-3h, and more preferably 2h.

[0034] In the present invention, after the smelting in step 1) is completed, refining and impurity removal is preferably performed to obtain a mixed aluminum liquid; the refining and impurity removal includes blowing nitrogen and settling in sequence, and the flow rate of nitrogen during the blowing process is preferably 0.5-0.8 m / s, more preferably 0.6-0.7 m / s, and the blowing time of nitrogen is preferably 3-5 min, more preferably 4 min. Blowing nitrogen can form a protective inert gas shield on the surface of the mixed aluminum liquid to isolate the outside air and prevent impurities in the air from entering the mixed aluminum liquid.

[0035] In the present invention, in step 1), the mixed aluminum liquid is preferably subjected to heat preservation treatment, and the temperature of the heat preservation treatment is preferably 650-780°C, more preferably 680-750°C, and more preferably 700-720°C.

[0036] In the present invention, it is preferred to preheat the die-casting mold before performing the die-casting described in step 2); the preheating method is preferably resistance wire heating, the preheating temperature is preferably 500-530°C, more preferably 510-520°C, and the preheating time is preferably 200-300s, more preferably 250s.

[0037] In the present invention, the die casting in step 2) preferably includes a first die casting and a second die casting. When the mass of the mixed aluminum liquid in the die casting mold by the first die casting preferably reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the second die casting is performed until the die casting is completed;

[0038] The injection flow rate of the first die casting is preferably 1.8-2.0 m / s, more preferably 1.85-1.95 m / s, more preferably 1.9 m / s; the pressure is preferably 45-50 MPa, more preferably 46-49 MPa, more preferably 47-48 MPa; the temperature is preferably 650-700°C, more preferably 660-690°C, more preferably 670-680°C;

[0039] The injection flow rate of the second die-casting is preferably 0.8-1.0 m / s, more preferably 0.85-0.95 m / s, and more preferably 0.9 m / s; the pressure is preferably 60-70 MPa, more preferably 62-68 MPa, and more preferably 65 MPa; the temperature is preferably 750-800°C, more preferably 760-790°C, and more preferably 770-780°C.

[0040] In the present invention, by dynamically adjusting the injection parameters of die casting (including injection flow rate, pressure and temperature), dynamic adjustment of the state of the die casting in the die casting mold is achieved, local defects of the die casting are reduced, and the die casting quality and yield rate of the antibacterial aluminum alloy are effectively improved.

[0041] In the present invention, the medium used for shot peening in step 3) is preferably steel shot, and the diameter of the medium is preferably 0.2-0.3 mm, more preferably 0.22-0.28 mm, and more preferably 0.25 mm; the speed of shot peening is preferably 1000-1500 r / min, more preferably 1100-1400 r / min, and more preferably 1200-1300 r / min; the shot peening time is preferably 200-500 s, more preferably 300-400 s, and more preferably 350 s. Shot peening can improve the fatigue strength of die castings, thereby achieving the purpose of increasing service life.

[0042] In the present invention, the heat treatment in step 3) preferably comprises solution treatment, quenching treatment and aging treatment performed sequentially.

[0043] In the present invention, the temperature of the solution treatment is preferably 530-550°C, more preferably 535-545°C, and more preferably 540°C; the time of the solution treatment is preferably 2-60h, more preferably 6-40h, and more preferably 10-20h;

[0044] The medium used for the quenching treatment is preferably water, and the temperature of the water is preferably 20-25°C, more preferably 21-24°C, and more preferably 22-23°C; the time for the quenching treatment is preferably 6-10s, more preferably 7-9s, and more preferably 8s.

[0045] In the present invention, the temperature of the aging treatment is preferably 170 to 210° C., more preferably 180 to 200° C., and more preferably 190° C.; the time of the aging treatment is preferably 2 to 60 h, more preferably 6 to 40 h, and more preferably 10 to 20 h.

[0046] In the present invention, after the heat treatment in step 3) is completed, it is preferably directly air-cooled to obtain the antibacterial aluminum alloy; the air-cooling temperature is preferably 20-25°C, and more preferably 22-24°C.

[0047] The invention also provides application of the antibacterial aluminum alloy in door handles.

[0048] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0049] Example 1

[0050] In terms of weight percentage, the chemical composition of the antibacterial aluminum alloy is: Si 0.4%, Mg 0.9%, Fe 0.6%, Mn 0.15%, Ag 0.1%, Zn 3%, Cu 0.3%, rare earth element RE 0.3%, and the balance is Al and inevitable impurities. Among them, the rare earth element RE includes cerium, lanthanum and neodymium in a mass ratio of 1:3:1.5.

[0051] According to the chemical composition, pure aluminum, aluminum-silicon master alloy (the mass content of silicon in the aluminum-silicon master alloy is 10%), aluminum-magnesium master alloy (the mass content of magnesium in the aluminum-magnesium master alloy is 10%), aluminum-zinc master alloy (the mass content of zinc in the aluminum-zinc master alloy is 5%), aluminum-manganese master alloy (the mass content of manganese in the aluminum-manganese master alloy is 5%), aluminum-copper master alloy (the mass content of copper in the aluminum-copper master alloy is 5%), pure silver, aluminum-cerium master alloy (the mass content of cerium in the aluminum-cerium master alloy is 5%), aluminum-lanthanum master alloy (the mass content of lanthanum in the aluminum-lanthanum master alloy is 5%) and aluminum-neodymium master alloy (the mass content of neodymium in the aluminum-neodymium master alloy is 5%) are weighed, and pure aluminum, aluminum-silicon master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy and aluminum-copper master alloy are first added into a melting furnace and heated to 720° C., and then the aluminum-magnesium master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy are added into the melting furnace, and the temperature is raised to 740° C. and the melting is kept at this temperature for 30 minutes. After smelting, wait until the temperature drops to 720℃, skim off the scum on the surface of the molten liquid, blow nitrogen gas into the molten liquid at a flow rate of 0.8m / s for 4 minutes, and then let it settle for 30 minutes to obtain mixed aluminum liquid. The mixed aluminum liquid is kept at 700℃ for standby use.

[0052] The die casting mold is heated to 520℃ and preheated for 200s by resistance wire heating, and then die casting is performed. The pressure flow rate at the beginning of die casting is 1.8m / s, the pressure is 45MPa, and the temperature is 680℃; when the mass of the mixed aluminum liquid in the die casting mold reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the pressure flow rate is adjusted to 1.0m / s, the pressure is adjusted to 70MPa, and the temperature is adjusted to 780℃, and die casting is continued until the die casting is completed. After the mixed aluminum liquid solidifies and forms, it is demolded to obtain a die casting embryo. The die casting embryo is polished and ground to make the surface of the die casting embryo smooth.

[0053] The polished die-casting blank was shot peened with steel shot with a diameter of 0.25 mm, the speed of shot peening was 1000 r / min, and the time of shot peening was 350 s. After shot peening, the die casting was solution treated at 540 ° C for 10 h. The die casting after solution treatment was immersed in water at a temperature of 22 ° C and quenched for 8 s. After being taken out, the casting was placed at 190 ° C for aging treatment for 10 h. The casting after aging treatment was placed in an environment with a temperature of 22 ° C for air cooling, and the casting was cooled to room temperature to obtain an antibacterial aluminum alloy.

[0054] Example 2

[0055] In terms of weight percentage, the chemical composition of the antibacterial aluminum alloy is: Si 0.4%, Mg 0.9%, Fe 0.6%, Mn 0.15%, Ag 4%, Zn 3%, Cu 0.3%, rare earth element RE 1%, and the balance is Al and inevitable impurities. Among them, the rare earth element RE includes cerium, lanthanum and neodymium in a mass ratio of 1:1:2.

[0056] According to the chemical composition, pure aluminum, aluminum-silicon master alloy (the mass content of silicon in the aluminum-silicon master alloy is 10%), aluminum-magnesium master alloy (the mass content of magnesium in the aluminum-magnesium master alloy is 10%), aluminum-zinc master alloy (the mass content of zinc in the aluminum-zinc master alloy is 5%), aluminum-manganese master alloy (the mass content of manganese in the aluminum-manganese master alloy is 5%), aluminum-copper master alloy (the mass content of copper in the aluminum-copper master alloy is 5%), pure silver, aluminum-cerium master alloy (the mass content of cerium in the aluminum-cerium master alloy is 5%), aluminum-lanthanum master alloy (the mass content of lanthanum in the aluminum-lanthanum master alloy is 5%) and aluminum-neodymium master alloy (the mass content of neodymium in the aluminum-neodymium master alloy is 5%) were weighed, and pure aluminum, aluminum-silicon master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy and aluminum-copper master alloy were first added into a melting furnace and heated to 720° C., and then the aluminum-magnesium master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy were added into the melting furnace, and the temperature was increased to 750° C. and smelted for 2 hours. After smelting, wait until the temperature drops to 720℃, skim off the scum on the surface of the molten liquid, blow nitrogen into the molten liquid at a flow rate of 0.5m / s for 5 minutes, and then let it settle for 40 minutes to obtain mixed aluminum liquid. The mixed aluminum liquid is kept warm at 650℃ for later use.

[0057] The die casting mold is heated to 500℃ and preheated for 300s by resistance wire heating, and then die casting is performed. The pressure flow rate at the beginning of die casting is 1.9m / s, the pressure is 50MPa, and the temperature is 700℃; when the mass of the mixed aluminum liquid in the die casting mold reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the pressure flow rate is adjusted to 0.9m / s, the pressure is adjusted to 60MPa, and the temperature is adjusted to 750℃, and die casting is continued until the die casting is completed. After the mixed aluminum liquid solidifies and forms, it is demolded to obtain a die casting embryo. The die casting embryo is polished and ground to make the surface of the die casting embryo smooth.

[0058] The polished die-casting blank was shot peened with steel shot with a diameter of 0.2 mm, the speed of shot peening was 1500 r / min, and the time of shot peening was 500 s. After shot peening, the die casting was solution treated at 530 ° C for 20 h. The die casting after solution treatment was immersed in water at a temperature of 25 ° C and quenched for 6 seconds. After being taken out, the casting was placed at 210 ° C for aging treatment for 2 hours. The casting after aging treatment was placed in an environment with a temperature of 20 ° C for air cooling, and the casting was cooled to room temperature to obtain an antibacterial aluminum alloy.

[0059] Example 3

[0060] The chemical composition of the antibacterial aluminum alloy is as follows: Si 1%, Mg 0.7%, Fe 0.9%, Mn 0.1%, Ag 2%, Zn 1.5%, Cu 0.2%, rare earth element RE 10%, and the balance is Al and inevitable impurities. Among them, the rare earth element RE includes cerium, lanthanum and neodymium in a mass ratio of 1:5:1.

[0061] According to the chemical composition, pure aluminum, aluminum-silicon master alloy (the mass content of silicon in the aluminum-silicon master alloy is 10%), aluminum-magnesium master alloy (the mass content of magnesium in the aluminum-magnesium master alloy is 10%), aluminum-zinc master alloy (the mass content of zinc in the aluminum-zinc master alloy is 5%), aluminum-manganese master alloy (the mass content of manganese in the aluminum-manganese master alloy is 5%), aluminum-copper master alloy (the mass content of copper in the aluminum-copper master alloy is 5%), pure silver, aluminum-cerium master alloy (the mass content of cerium in the aluminum-cerium master alloy is 5%), aluminum-lanthanum master alloy (the mass content of lanthanum in the aluminum-lanthanum master alloy is 5%) and aluminum-neodymium master alloy (the mass content of neodymium in the aluminum-neodymium master alloy is 5%) are weighed, and pure aluminum, aluminum-silicon master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy and aluminum-copper master alloy are first added into a melting furnace and heated to 680° C., and then the aluminum-magnesium master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy are added into the melting furnace, and the temperature is raised to 720° C. and the melting is kept at this temperature for 4 hours. After smelting, wait until the temperature drops to 700℃, skim off the scum on the surface of the molten liquid, blow nitrogen into the molten liquid at a flow rate of 0.7m / s for 3 minutes, and then let it settle for 30 minutes to obtain mixed aluminum liquid. The mixed aluminum liquid is kept warm at 680℃ for later use.

[0062] The die casting mold is heated to 530℃ by resistance wire heating for 250s, and then die casting is performed. The pressure flow rate at the beginning of die casting is 2.0m / s, the pressure is 47MPa, and the temperature is 650℃; when the mass of the mixed aluminum liquid in the die casting mold reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the pressure flow rate is adjusted to 0.8m / s, the pressure is adjusted to 65MPa, and the temperature is adjusted to 800℃, and die casting is continued until the die casting is completed. After the mixed aluminum liquid solidifies and forms, it is demolded to obtain a die casting embryo. The die casting embryo is polished and ground to make the surface of the die casting embryo smooth.

[0063] The polished die casting blank was shot peened with steel shot with a diameter of 0.3 mm, the speed of shot peening was 1200 r / min, and the time of shot peening was 200 s. After shot peening, the die casting was solution treated at 550 ° C for 2 h. The die casting after solution treatment was immersed in water at a temperature of 20 ° C and quenched for 10 s. After being taken out, the casting was placed at 170 ° C for aging treatment for 20 h. The casting after aging treatment was placed in an environment with a temperature of 25 ° C for air cooling, and the casting was cooled to room temperature to obtain an antibacterial aluminum alloy.

[0064] Comparative Example 1

[0065] The difference from Example 1 is that the injection flow rate at the beginning of die casting is 1.5 m / s, the pressure is 55 MPa, and the temperature is 700° C. until the end of die casting.

[0066] Comparative Example 2

[0067] The difference from Example 1 is that the rare earth element RE contains cerium, lanthanum and neodymium in a mass ratio of 5:3:1.5.

[0068] Comparative Example 3

[0069] The difference from Example 1 is that the rare earth element RE in Example 1 is omitted.

[0070] The elongation strength, yield strength, elongation after fracture and hardness of the aluminum alloys of Examples 1 to 3 and Comparative Examples 1 to 3 were measured respectively. The test results are shown in Table 1.

[0071] The tensile strength, yield strength and elongation of aluminum alloy are tested according to GB / T 228.1-2010, and the hardness of aluminum alloy is tested according to YS / T 420-2000.

[0072] Table 1 Test results of mechanical properties of aluminum alloy

[0073] Tensile strength / MPa Yield strength / MPa Elongation / % Hardness / HV Example 1 190 160 6 68 Example 2 202 175 6.5 70 Example 3 310 240 2 85 Comparative Example 1 197 169 6.2 70 Comparative Example 2 267 183 2.4 80 Comparative Example 3 165 137 3.4 60

[0074] The antibacterial properties and antibacterial durability of the aluminum alloys of Examples 1 to 3 and Comparative Examples 1 to 3 against Escherichia coli were measured respectively. The test results are shown in Table 2.

[0075] The antibacterial activity of aluminum alloy against Escherichia coli was tested according to JIS Z 2801-2000, wherein the control group was 6063 aluminum alloy, and the number of viable bacteria on the surface of the aluminum alloy sample after bacterial culture was determined by flow cytometry. The sterilization rate was calculated as follows: Sterilization rate (%) = [(the number of viable bacteria on the surface of the control group aluminum alloy sample - the number of viable bacteria on the surface of the antibacterial aluminum alloy sample) / the number of viable bacteria on the surface of the control group aluminum alloy sample] × 100%.

[0076] The antibacterial property of aluminum alloy against Escherichia coli after wiping with a wet cloth was tested according to JIS Z 2801-2000.

[0077] The antimicrobial durability is the bactericidal rate after 12 months of testing in accordance with JIS Z 2801-2000.

[0078] Table 2 Test results of antibacterial property and antibacterial durability of antibacterial aluminum alloy

[0079]

[0080] It can be seen from Table 2 that the antibacterial aluminum alloy of the present invention has excellent antibacterial properties and exhibits high antibacterial properties even in a humid environment; the antibacterial aluminum alloy of the present invention can achieve a lasting antibacterial effect for 12 months, meeting the requirements of antibacterial properties for various application scenarios.

[0081] The antibacterial aluminum alloy of Example 1 and the 6063 aluminum alloy were subjected to a patch test with fixed contact with fresh chicken, and cultured in a constant temperature box at 37° C. to observe the quality of the chicken at different culture times. The test results are shown in Table 3.

[0082] Table 3 Corrosion resistance test results of aluminum alloy

[0083]

[0084] It can be seen from Table 3 that the corrosion degree of the chicken meat of the antibacterial aluminum alloy patch of Example 1 is significantly lower than that of the 6063 aluminum alloy. This result shows that the antibacterial aluminum alloy of the present invention has excellent corrosion resistance and can slow down corrosion.

[0085] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An antibacterial aluminum alloy, characterized in that: Measured in weight percentage, the chemical composition of the antibacterial aluminum alloy is: Si 0.1-1%, Mg 0.45-0.9%, Fe 0.1-0.9%, Mn 0.1-0.2%, Ag 0.1-4%, Zn 0.1-3%, Cu 0.1-0.3%, rare earth element RE 0.1-30%, and the balance is Al and inevitable impurities.

2. The antibacterial aluminum alloy according to claim 1, characterized in that: The rare earth elements RE include cerium, lanthanum and neodymium, and the mass ratio of cerium, lanthanum and neodymium is 1:1-5:1-2.

3. The method for preparing the antibacterial aluminum alloy according to claim 1 or 2, characterized in that: The following steps are included: 1) smelting pure aluminum, aluminum-silicon master alloy, aluminum-magnesium master alloy, aluminum-zinc master alloy, aluminum-manganese master alloy, aluminum-copper master alloy, pure silver, aluminum-cerium master alloy, aluminum-lanthanum master alloy and aluminum-neodymium master alloy to obtain a mixed aluminum liquid; 2) Die-casting the mixed aluminum liquid to obtain a die-casting embryo; 3) The die-casting embryo is shot peened and heat treated in sequence to obtain the antibacterial aluminum alloy.

4. The preparation method according to claim 3, characterized in that: Step 1) The smelting temperature is 680-750° C. and the smelting time is 0.5-4 h.

5. The preparation method according to claim 3 or 4, characterized in that: Step 2) The die casting includes a first die casting and a second die casting. When the mass of the mixed aluminum liquid in the die casting mold reaches 2 / 3 of the total mass of the mixed aluminum liquid required by the die casting mold, the second die casting is performed until the die casting is completed; The first die casting has a pressure flow rate of 1.8-2.0 m / s, a pressure of 45-50 MPa, and a temperature of 650-700° C.; The second die casting has a pressure flow rate of 0.8-1.0 m / s, a pressure of 60-70 MPa, and a temperature of 750-800°C.

6. The preparation method according to claim 5, characterized in that: Step 3) The medium used for shot peening is steel shot, the diameter of the medium is 0.2-0.3 mm, the rotation speed of shot peening is 1000-1500 r / min, and the shot peening time is 200-500 s.

7. The preparation method according to claim 6, characterized in that: Step 3) The heat treatment comprises solution treatment, quenching treatment and aging treatment performed sequentially.

8. The preparation method according to claim 7, characterized in that: The temperature of the solution treatment is 530-550°C, and the time of the solution treatment is 2-60h; The medium used in the quenching treatment is water, the temperature of the water is 20-25° C., and the quenching treatment time is 6-10 seconds.

9. The preparation method according to claim 7 or 8, characterized in that: The temperature of the aging treatment is 170-210° C., and the time of the aging treatment is 2-60 hours.

10. Use of the antibacterial aluminum alloy according to claim 1 or 2 in door handles.

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