High-toughness al-zn-mn-cu antibacterial aluminum alloy and application thereof

Abstract

The application provides a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy and an application thereof, and belongs to the technical field of aluminum alloy preparation; the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy with high strength and high toughness and plasticity and antibacterial performance is prepared without using rare earth elements, Mg elements and other surface treatment technologies; the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy avoids using Mg elements, and improves the corrosion resistance and toughness and plasticity of the alloy; the preparation of the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy does not involve surface treatment methods such as anodic oxidation and micro-arc oxidation, and simplifies the preparation process; the thin plate or foil prepared from the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has high breaking strength and elongation, and can be applied to the fields of public transportation, medical devices, building decoration and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy preparation, and particularly relates to a high-strength and high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy and application thereof. BACKGROUND

[0002] Aluminum alloy has the properties of light weight, beauty, rust resistance and easy forming, and can be made into profiles in the form of bars, plates and foils. However, aluminum alloy is prone to bacterial growth in humid air, resulting in corrosion. The originally small pitting corrosion will spread into large-scale corrosion as the corrosion degree increases, which seriously affects the use and decoration effect of aluminum alloy. Therefore, it is necessary to provide an antibacterial aluminum alloy which has a certain antibacterial effect while maintaining the mechanical properties and surface smoothness of the aluminum alloy substrate. The antibacterial aluminum alloy has potential application value in the fields of medical treatment, food processing, aerospace, public transportation and building, and can reduce the risk of cross infection. According to the different preparation methods, the antibacterial aluminum alloy can be roughly divided into two categories: alloy type antibacterial aluminum alloy and surface coating type antibacterial aluminum alloy. The alloy type antibacterial aluminum alloy is prepared by adding antibacterial metal elements (such as Zn, Cu, Ag, Mn and rare earth elements) during the preparation of the aluminum alloy, so that the alloy type antibacterial aluminum alloy with antibacterial metal elements uniformly dispersed in the aluminum alloy is prepared. However, the use of rare earth elements and Ag elements as antibacterial elements will increase the cost of the alloy.

[0003] Al-Zn alloy has been widely used for many years as a high-strength aluminum alloy. Common alloy systems include Al-Zn-Mg and Al-Zn-Mg-Cu. The addition of Mg or Cu elements improves the strength of the alloy, but the main strengthening phase in this type of alloy is η phase (a precipitated phase composed of Mg and Zn elements, with a typical stoichiometric formula of MgZn2). In terms of microstructure characteristics, η phase is continuously distributed at the grain boundaries of the matrix, which weakens the corrosion resistance and fracture toughness of the alloy, and also easily causes cracking during the manufacture of thin plates or foils, thereby reducing the yield. In addition, the existing technology also uses surface treatment methods such as anodic oxidation and micro-arc oxidation to improve the corrosion resistance of the alloy, but the surface treatment method has a complex process flow, which not only increases the manufacturing cost of the alloy, but also prolongs the manufacturing time of the alloy. Therefore, it is necessary to provide a high-strength and high-toughness, corrosion-resistant and antibacterial aluminum alloy suitable for manufacturing thin plates or foils. SUMMARY

[0004] In view of the deficiencies in the prior art, the application provides a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy and an application thereof; the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy with high strength and high toughness and antibacterial performance is manufactured without using rare earth elements, Mg elements and other surface treatment technologies; the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy avoids using Mg elements, and improves the corrosion resistance and toughness of the alloy; the preparation of the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy does not involve surface treatment methods such as anodic oxidation and micro-arc oxidation, and simplifies the preparation process; the thin plate or foil prepared from the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has high breaking strength and elongation, and can be applied to the fields of public transportation, medical devices, building decoration and the like.

[0005] In order to achieve the above technical purpose, the application adopts the following technical means:

[0006] The application first provides a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy, the component range of the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy is Zn: 7wt.% to 12wt.%, Mn: 0.8wt.% to 1.4wt.%, Cu: 0.4wt.% to 1.4wt.%, and the balance is Al, and the unavoidable impurity elements contained in the raw material are not more than 0.03wt.% individually and not more than 0.2wt.% in total.

[0007] The application further provides an application of the above high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy in the preparation of a thin plate or foil.

[0008] The application further provides a preparation method of a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product, and specifically includes the following steps:

[0009] (1) the raw materials are calculated and weighed according to the component range of the above high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy, and the raw materials are used to prepare Al-Zn-Mn-Cu alloy ingots by using a general melting technology;

[0010] (2) the Al-Zn-Mn-Cu alloy ingots are preheated and treated, and after the treatment is completed, the Al-Zn-Mn-Cu alloy ingots are subjected to forging and pressing to manufacture thick plates;

[0011] (3) the thick plates are cooled to room temperature, and after the surface stains are removed by cleaning, the thick plates are continuously subjected to heat preservation treatment, and after the heat preservation treatment is completed, the preliminary thick plates are obtained;

[0012] (4) the preliminary thick plates are subjected to multi-pass rolling by using double-roller rolling, and after the treatment is completed, the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product is obtained; the product is a thin plate or a foil.

[0013] Preferably, in step (1), the raw material comprises industrial pure aluminum, industrial pure zinc, industrial pure manganese or Al-Mn alloy, industrial pure copper or Al-Cu alloy.

[0014] The shape of the Al-Zn-Mn-Cu alloy ingot comprises a cylindrical ingot or a square ingot.

[0015] Preferably, the Al-Mn alloy comprises Al20Mn; and the Al-Cu alloy comprises Al30Cu.

[0016] Preferably, in step (2), the heat preservation treatment comprises heat preservation at 370-410℃ for 60-100 minutes; and the forging step comprises a pressing rate of 5-15 mm / s, continuous forging to 2 / 3-1 / 3 of the size of the Al-Zn-Mn-Cu alloy ingot, and no temperature control during the forging.

[0017] Preferably, in step (3), the heat preservation treatment comprises heat preservation at 420-460℃ for 60-100 minutes.

[0018] Preferably, in step (4), the multi-pass rolling comprises a first-pass pressing amount of 15-30% of the original size of the preliminary thick plate, and a pressing amount of 10-20% of the thickness of the previous pass for the remaining passes; and the material is re-heat preserved after each pass of rolling.

[0019] Preferably, the heat preservation treatment comprises heat preservation at 10-20℃ higher than the temperature in step (3) for 20-45 minutes.

[0020] Preferably, the thickness of the sheet or foil is 0.2-4 mm.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] Compared with the prior Al-Zn-Mg series, Al-Mn series and Al-Zn-Mg-Mn series, and antibacterial aluminum alloy, the present application adds Mn element in the aluminum alloy, which can match with Zn and Cu elements in the aluminum alloy to achieve good antibacterial effect; on the other hand, the Mn element can also improve the corrosion resistance of the Al-Zn series alloy. The Al6Mn or Al 12 Mn phase formed by Mn and Al can also serve as a strengthening phase of the alloy to improve the strength and toughness of the alloy; in addition, the total amount of the effective antibacterial elements (Zn, Mn and Cu) in the present application is high, which improves the antibacterial efficiency of the alloy and also improves the mechanical properties of the alloy.

[0023] The application does not use rare earth elements and Ag elements as antibacterial elements, and reduces the cost of the alloy. In addition, by increasing the content of Zn element in the preparation of the alloy, the application avoids the use of Mg element as an alloy element, avoids the η phase, improves the mechanical properties of the alloy, and improves the antibacterial effect and corrosion resistance of the alloy.

[0024] The alloy preparation process of the application uses general melting technology to prepare ingots, and does not involve surface treatment methods such as anodic oxidation and micro-arc oxidation, thereby simplifying the manufacturing process. The preparation method of the application does not involve waste gas and waste water emissions, and will not pollute the environment. The high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy prepared by the method has good mechanical properties, high toughness and plasticity, and good antibacterial performance, and can be rolled into a plate or foil with a thickness of 0.2mm-4mm. The high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has a yield strength of more than 320MPa and an elongation of not less than 15%. The high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has an antibacterial rate of more than 99.8% for Escherichia coli and metal staphylococcus. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The photo of the sample prepared in Example 1.

[0026] Figure 2 The photo of the sample prepared in Example 4 and Example 8.

[0027] Figure 3 The tensile curve of the sample prepared in Example 1 and Example 7.

[0028] Figure 4 The tensile curve of the sample prepared in Example 2-6 and Example 8-10. DETAILED DESCRIPTION

[0029] The application will be further described below in conjunction with specific examples, but the protection scope of the application is not limited thereto.

[0030] Example 1:

[0031] (1) Design the alloy composition in the Al-Zn-Mn-Cu alloy system: Zn: 7.0wt%, Mn: 0.8wt%, Cu: 0.4wt%, and the balance is Al. According to the designed alloy composition, the total weight is 2kg, and the raw materials meeting the designed composition are weighed. Specifically, the industrial pure aluminum is 1.753kg, the industrial pure zinc is 0.140kg, the Al20Mn alloy is 0.080kg, and the Al30Cu alloy is 0.027kg.

[0032] Then the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy cylindrical ingot with a diameter of 50 mm using the general smelting technique.

[0033] (2) The Al-Zn-Mn-Cu alloy cylindrical ingot is placed into a muffle furnace for preheating and holding, a temperature of 370°C is adopted, the holding time is 60 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the pressing rate is 5 mm / s, continuous forging is performed to 2 / 3 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0034] (3) After the thick plate is cooled to room temperature, the thick plate is cleaned using a 30 vol.% ethanol aqueous solution to remove surface stains. Then the thick plate is re-placed into the muffle furnace for holding, a temperature of 420°C is adopted, the holding time is 30 minutes, and a prepared thick plate is obtained, ready for rolling.

[0035] (4) The prepared thick plate is rolled by double-roller rolling in multiple passes, the first pass pressing amount is 15% of the original size of the prepared thick plate, and the pressing amount of the remaining passes is 10% of the thickness of the previous pass. After each pass of rolling, the thick plate needs to be placed into the muffle furnace for holding, the holding temperature is 10°C higher than that in step (3), i.e. 430°C, and the holding time is 20 minutes. The plate is obtained after rolling, and the foil with a thickness of 0.2 mm is obtained after rolling, and the prepared foil is as shown in Figure 1 .

[0036] Example 2:

[0037] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 8.0 wt%; Mn: 0.8 wt%; Cu: 0.6 wt%; and the balance is Al. According to the designed alloy composition, the total weight of 2 kg is calculated, and each raw material meeting the designed composition is weighed. Specifically, the industrial pure aluminum is weighed as 1.720 kg, the industrial pure zinc is weighed as 0.160 kg, the Al20Mn alloy is weighed as 0.080 kg, and the Al30Cu alloy is weighed as 0.040 kg.

[0038] Then the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy cylindrical ingot with a diameter of 50 mm using the general smelting technique.

[0039] (2) The Al-Zn-Mn-Cu alloy cylindrical ingot is placed into a muffle furnace for preheating and holding, a temperature of 390°C is adopted, the holding time is 60 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the pressing rate is 10 mm / s, continuous forging is performed to 2 / 3 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0040] (3) After the thick plate cools to room temperature, clean the thick plate using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, re-put the thick plate into the muffle furnace for heat preservation, and obtain a preliminary thick plate by using a temperature of 420 °C and a heat preservation time of 30 minutes, ready for rolling.

[0041] (4) The preliminary thick plate is rolled by using double-roller rolling in multiple passes, the first pass is 15% of the original size of the preliminary thick plate, and the remaining passes are 10% of the thickness of the previous pass. After each pass, the thick plate is put into the muffle furnace for heat preservation, the heat preservation temperature is 15 °C higher than that in step (3), i.e. 455 °C, and the heat preservation time is 30 minutes. After rolling, a plate is obtained, and a thin plate with a thickness of 3 mm is obtained after rolling.

[0042] Example 3:

[0043] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 8.0 wt%; Mn: 1.4 wt%; Cu: 0.7 wt%; and the balance is Al. According to the designed alloy composition, the total weight is 2 kg, and the raw materials meeting the designed composition are weighed. Specifically, the industrial pure aluminum is 1.653 kg, the industrial pure zinc is 0.160 kg, the Al20Mn alloy is 0.140 kg, and the Al30Cu alloy is 0.047 kg.

[0044] Then, the raw materials are sequentially put into a graphite crucible according to the general melting technology specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 30 mm by using the general melting technology.

[0045] (2) The Al-Zn-Mn-Cu alloy square ingot is put into a muffle furnace for preheating and heat preservation, and a thick plate is obtained by using a temperature of 410 °C and a heat preservation time of 90 minutes. After the heat preservation treatment, the thick plate is forged at a pressing rate of 12 mm / s, and the continuous forging is performed to 1 / 3 of the diameter of the cylindrical ingot during the heat preservation treatment. The temperature is not controlled during the forging, and a thick plate is obtained after the forging.

[0046] (3) After the thick plate cools to room temperature, clean the thick plate using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, re-put the thick plate into the muffle furnace for heat preservation, and obtain a preliminary thick plate by using a temperature of 460 °C and a heat preservation time of 60 minutes, ready for rolling.

[0047] (4) The preliminary thick plate is rolled by using double-roller rolling in multiple passes, the first pass is 30% of the original size of the preliminary thick plate, and the remaining passes are 20% of the thickness of the previous pass. After each pass, the thick plate is put into the muffle furnace for heat preservation, the heat preservation temperature is 20 °C higher than that in step (3), i.e. 480 °C, and the heat preservation time is 40 minutes. After rolling, a plate is obtained, and a thin plate with a thickness of 4 mm is obtained after rolling.

[0048] Example 4:

[0049] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 12wt%; Mn: 1.4wt%; Cu: 1.4wt%; and the balance being Al. According to the designed alloy composition, the total weight of 2 kg is calculated, and each raw material meeting the designed composition is weighed. Specifically, the industrial pure aluminum is weighed as 1.527 kg, the industrial pure zinc is weighed as 0.240 kg, the Al20Mn alloy is weighed as 0.140 kg, and the Al30Cu alloy is weighed as 0.093 kg.

[0050] Then, the above raw materials are sequentially placed into a graphite crucible according to the general smelting technology specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 30 mm by using the general smelting technology.

[0051] (2) The Al-Zn-Mn-Cu alloy square ingot is placed into a muffle furnace for preheating and holding, a temperature of 410°C is adopted, and the holding time is 100 minutes. After the holding treatment is completed, the thick plate is manufactured by stamping, the down-pressing rate is 15 mm / s, and the stamping is continuously performed to 1 / 3 of the diameter of the cylindrical ingot during the holding treatment. The temperature is not controlled during the stamping, and the thick plate is obtained after the stamping is completed.

[0052] (3) After the thick plate is cooled to room temperature, the thick plate is cleaned using a 30vol.% ethanol aqueous solution to remove surface stains. Then, the thick plate is re-placed into the muffle furnace for holding, a temperature of 460°C is adopted, and the holding time is 60 minutes to obtain a preliminary thick plate for rolling.

[0053] (4) The preliminary thick plate is rolled by using a double-roller rolling in multiple passes. The down-pressing amount of the first pass is 30% of the original size of the preliminary thick plate, and the down-pressing amount of the remaining passes is 20% of the thickness of the previous pass. After each pass of rolling, the thick plate needs to be placed into the muffle furnace for holding, the holding temperature is 20°C higher than that in step (3), i.e., 480°C, and the holding time is 45 minutes. The plate is obtained after the rolling is completed, and the thin plate with a thickness of 4 mm is obtained after the rolling is completed. The actual thin plate prepared is shown in Figure 2 .

[0054] Example 5:

[0055] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 9.5wt%; Mn: 1.1wt%; Cu: 1.1wt%; and the balance being Al. According to the designed alloy composition, the total weight of 2 kg is calculated, and each raw material meeting the designed composition is weighed. Specifically, the industrial pure aluminum is weighed as 1.627 kg, the industrial pure zinc is weighed as 0.190 kg, the Al20Mn alloy is weighed as 0.110 kg, and the Al30Cu alloy is weighed as 0.073 kg.

[0056] Then the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 30 mm using the general smelting technique.

[0057] (2) The Al-Zn-Mn-Cu alloy square ingot is placed into a muffle furnace for preheating and holding, a temperature of 390°C is adopted, the holding time is 80 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the downward pressing rate is 10 mm / s, continuous forging is performed to 1 / 2 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0058] (3) After the thick plate is cooled to room temperature, the thick plate is cleaned using a 30 vol.% ethanol aqueous solution to remove surface stains. Then the thick plate is re-placed into the muffle furnace for holding, a temperature of 440°C is adopted, the holding time is 45 minutes, and a prepared thick plate is obtained, ready for rolling.

[0059] (4) The prepared thick plate is rolled by double-roller rolling in multiple passes, the downward pressing amount of the first pass is 25% of the original size of the prepared thick plate, and the downward pressing amount of the remaining passes is 15% of the thickness of the previous pass. After each pass of rolling, the thick plate needs to be placed into the muffle furnace for holding, the holding temperature is 15°C higher than that in step (3), i.e., 455°C, and the holding time is 35 minutes. The plate is obtained after the rolling is completed, and a thin plate with a thickness of 1.75 mm is obtained after the rolling is completed.

[0060] Example 6:

[0061] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 9.0 wt%; Mn: 1.3 wt%; Cu: 1.2 wt%; and the balance is Al. According to the designed alloy composition, the total weight of 2 kg is calculated, and the raw materials meeting the designed composition are weighed. Specifically, the industrial pure aluminum is weighed as 1.610 kg, the industrial pure zinc is weighed as 0.180 kg, the Al20Mn alloy is weighed as 0.130 kg, and the Al30Cu alloy is weighed as 0.080 kg.

[0062] Then the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 30 mm using the general smelting technique.

[0063] (2) The Al-Zn-Mn-Cu alloy square ingot is placed into a muffle furnace for preheating and holding, a temperature of 400°C is adopted, the holding time is 75 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the downward pressing rate is 12 mm / s, continuous forging is performed to 1 / 2 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0064] (3) After the thick plate cools to room temperature, clean the thick plate using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, re-put the thick plate into the muffle furnace for heat preservation, and obtain a preliminary thick plate by using a temperature of 450 °C and a heat preservation time of 45 minutes, in preparation for rolling.

[0065] (4) The preliminary thick plate is rolled by using double-roller rolling in multiple passes, with a first pass reduction of 20% of the original size of the preliminary thick plate, and a remaining pass reduction of 15% of the thickness of the previous pass. After each pass of rolling, the thick plate is put into the muffle furnace for heat preservation, with a heat preservation temperature that is 15 °C higher than the temperature described in step (3), i.e., 465 °C, and a heat preservation time of 30 minutes. After the rolling is completed, a plate is obtained, and a thin plate with a thickness of 3 mm is obtained after the rolling is completed.

[0066] Example 7:

[0067] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 7.0 wt%; Mn: 1.2 wt%; Cu: 1.4 wt%; and the balance is Al. According to the designed alloy composition, the total weight of 2 kg is calculated, and the raw materials corresponding to the designed composition are weighed. Specifically, the industrial pure aluminum is weighed as 1.647 kg, the industrial pure zinc is weighed as 0.140 kg, the Al20Mn alloy is weighed as 0.120 kg, and the Al30Cu alloy is weighed as 0.093 kg.

[0068] Then, the general melting technology is used, and the above raw materials are sequentially put into a graphite crucible according to the general melting technology specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 30 mm.

[0069] (2) The Al-Zn-Mn-Cu alloy square ingot is put into a muffle furnace for preheating and heat preservation, and a temperature of 380 °C is used for a heat preservation time of 90 minutes. After the heat preservation treatment is completed, the thick plate is manufactured by forging, with a reduction rate of 7 mm / s, and the continuous forging is performed to 1 / 2 of the diameter of the cylindrical ingot during the heat preservation treatment. The temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0070] (3) After the thick plate cools to room temperature, clean the thick plate using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, re-put the thick plate into the muffle furnace for heat preservation, and obtain a preliminary thick plate by using a temperature of 450 °C and a heat preservation time of 45 minutes, in preparation for rolling.

[0071] (4) The preliminary thick plate is rolled by using double-roller rolling in multiple passes, with a first pass reduction of 20% of the original size of the preliminary thick plate, and a remaining pass reduction of 10% of the thickness of the previous pass. After each pass of rolling, the thick plate is put into the muffle furnace for heat preservation, with a heat preservation temperature that is 10 °C higher than the temperature described in step (3), i.e., 460 °C, and a heat preservation time of 20 minutes. After the rolling is completed, a plate is obtained, and a thin plate with a thickness of 0.8 mm is obtained after the rolling is completed, and the actual thin plate prepared is as followsFigure 2 as shown.

[0072] Example 8

[0073] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system was designed as follows: Zn: 7.5wt%; Mn: 1.0wt%; Cu: 1.3wt%; and the balance being Al. According to the designed alloy composition, the total weight of 2 kg was calculated, and each raw material meeting the designed composition was weighed. Specifically, 1.663 kg of industrial pure aluminum, 0.150 kg of industrial pure zinc, 0.100 kg of Al20Mn alloy, and 0.087 kg of Al30Cu alloy were weighed.

[0074] Then, the above raw materials were sequentially placed into a graphite crucible according to the general smelting technology specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 50 mm using the general smelting technology.

[0075] (2) The Al-Zn-Mn-Cu alloy square ingot was placed into a muffle furnace for preheating and holding, a temperature of 410°C was adopted, and the holding time was 60 minutes. After the holding treatment was completed, the thick plate was manufactured by forging, the pressing rate was 12 mm / s, and the continuous forging was performed to 1 / 2 of the diameter of the cylindrical ingot during the holding treatment. The temperature was not controlled during the forging, and the thick plate was obtained after the forging was completed.

[0076] (3) After the thick plate was cooled to room temperature, the thick plate was cleaned using a 30vol.% ethanol aqueous solution to remove surface stains. Then, the thick plate was re-placed into the muffle furnace for holding, a temperature of 460°C was adopted, and the holding time was 30 minutes to obtain a preliminary thick plate for rolling.

[0077] (4) The preliminary thick plate was rolled by double-roller rolling in multiple passes. The first pass was pressed by 30% of the original size of the preliminary thick plate, and the remaining passes were pressed by 10% of the thickness of the previous pass. After each pass of rolling, the thick plate was placed into the muffle furnace for holding, the holding temperature was 10°C higher than that in step (3), i.e., 470°C, and the holding time was 30 minutes. After the rolling was completed, the plate was obtained, and the thin plate with a thickness of 2 mm was obtained after the rolling was completed. The actual thin plate prepared is shown in Figure 2 as shown.

[0078] Example 9

[0079] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system was designed as follows: Zn: 10.0wt%; Mn: 0.9wt%; Cu: 0.5wt%; and the balance being Al. According to the designed alloy composition, the total weight of 2 kg was calculated, and each raw material meeting the designed composition was weighed. Specifically, 1.677 kg of industrial pure aluminum, 0.200 kg of industrial pure zinc, 0.090 kg of Al20Mn alloy, and 0.033 kg of Al30Cu alloy were weighed.

[0080] Then, the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 20 mm using a general smelting technique.

[0081] (2) The Al-Zn-Mn-Cu alloy square ingot is placed into a muffle furnace for preheating and holding, a temperature of 410°C is adopted, the holding time is 60 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the downward pressing rate is 15 mm / s, the continuous forging is pressed to 1 / 2 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0082] (3) After the thick plate is cooled to room temperature, the thick plate is cleaned using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, the thick plate is re-placed into the muffle furnace for holding, a temperature of 450°C is adopted, the holding time is 60 minutes, and a prepared thick plate is obtained, which is prepared for rolling.

[0083] (4) The prepared thick plate is rolled by using a double-roller rolling in multiple passes, the downward pressing amount of the first pass is 30% of the original size of the prepared thick plate, and the downward pressing amount of the remaining passes is 20% of the thickness of the previous pass. After each pass of rolling, the thick plate needs to be placed into the muffle furnace for holding, the holding temperature is 10°C higher than that in step (3), i.e., 460°C, and the holding time is 45 minutes. The plate is obtained after the rolling is completed, and a thin plate with a thickness of 1.1 mm is obtained after the rolling is completed.

[0084] Example 10:

[0085] (1) The alloy composition in the Al-Zn-Mn-Cu alloy system is designed as follows: Zn: 11.0 wt%; Mn: 1.0 wt%; Cu: 0.8 wt%; and the balance is Al. According to the designed alloy composition, the raw materials meeting the designed composition are weighed according to a total weight of 2 kg. Specifically, the industrial pure aluminum is weighed as 1.627 kg, the industrial pure zinc is weighed as 0.220 kg, the Al20Mn alloy is weighed as 0.100 kg, and the Al30Cu alloy is weighed as 0.053 kg.

[0086] Then, the above raw materials are sequentially placed into a graphite crucible according to the general smelting technical specification to prepare an Al-Zn-Mn-Cu alloy square ingot with a diameter of 20 mm using a general smelting technique.

[0087] (2) The Al-Zn-Mn-Cu alloy square ingot is placed into a muffle furnace for preheating and holding, a temperature of 410°C is adopted, the holding time is 60 minutes, after the holding treatment is completed, the thick plate is manufactured by forging, the downward pressing rate is 15 mm / s, the continuous forging is pressed to 1 / 2 of the diameter of the cylindrical ingot during the holding treatment, the temperature is not controlled during the forging, and the thick plate is obtained after the forging is completed.

[0088] (3) After the thick plate is cooled to room temperature, the thick plate is cleaned using a 30 vol.% ethanol aqueous solution to remove surface stains. Then, the thick plate is re-placed in the muffle furnace for heat preservation, and a temperature of 460°C is adopted for 60 minutes to obtain a preliminary thick plate, ready for rolling.

[0089] (4) The preliminary thick plate is rolled by double-roller rolling in multiple passes, and the first pass is 20% of the original size of the preliminary thick plate, and the remaining passes are 20% of the thickness of the previous pass. After each pass, the thick plate is placed in the muffle furnace for heat preservation, and the heat preservation temperature is 20°C higher than that in step (3), i.e. 480°C, and the heat preservation time is 45 minutes. After rolling, a plate is obtained, and a thin plate with a thickness of 4 mm is obtained after rolling.

[0090] The Al-Zn-Mn-Cu aluminum alloy materials prepared in Examples 1-10 are subjected to mechanical property testing according to the content recorded in GB / T 228.1-2021 Metal Materials Tensile Test Part 1: Room Temperature Test Method, and the test results are shown in Figure 3 、 Figure 4 and Table 1.

[0091] Table 1. Tensile mechanical properties of Examples 1-10

[0092] Yield strength (MPa) Tensile strength (MPa) Elongation (%) Example 1 325.7±3.6 427.2±12.8 18.6±0.7 Example 2 345.7±2.1 441.5±11.7 16.5±1.1 Example 3 359.4±4.8 468.8±12.3 20.9±0.6 Example 4 368.2±4.6 481.5±9.4 17.5±0.6 Example 5 343.8±5.2 449.3±7.4 15.7±0.8 Example 6 375.1±5.2 486.3±9.6 17.4±0.3 Example 7 351.6±4.1 476.8±6.2 21.2±0.4 Example 8 353.4±4.5 442.5±11.0 22.7±0.8 Example 9 355.5±6.7 463.9±5.2 18.8±1.1 Example 10 366.8±6.4 464.9±8.9 16.7±1.2

[0093] It can be seen that the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has a yield strength of more than 320 MPa and an elongation of not less than 15%, which is significantly better than the existing Al-Zn-Mg and Al-Mn aluminum alloys in the prior art.

[0094] The Al-Zn-Mn-Cu aluminum alloy materials prepared in Examples 1-10 are subjected to antibacterial property testing according to the content recorded in JIS Z 2801:2010 Antibacterial Processed Products-Antibacterial Test Method-Antibacterial Effect, and the test results are shown in Table 2.

[0095] Table 2. Antibacterial property testing of Examples 1-10

[0096] Escherichia coli Staphylococcus aureus Example 1 99.5％ 99.4％ Example 2 99.5％ 99.4％ Example 3 99.7％ 99.4％ Example 4 99.7％ 99.9％ Example 5 99.8％ 99.9％ Example 6 99.7％ 99.7％ Example 7 99.1％ 99.4％ Example 8 99.1％ 99.4％ Example 9 99.7％ 99.7％ Example 10 99.9％ 99.9％

[0097] In combination with Figure 4 and Table 2, it can be seen that the high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy has an antibacterial rate of more than 99.8% against Escherichia coli and Staphylococcus aureus, which is significantly better than the existing antibacterial aluminum alloy in the prior art.

[0098] To sum up, the technology disclosed by the application has good mechanical properties and antibacterial properties without using surface treatment, introducing noble metals such as Ag or rare earth elements, and can be applied to the fields of transportation and aerospace with high mechanical property requirements.

[0099] The embodiments are preferred embodiments of the application, but the application is not limited to the above embodiments, and any obvious improvements, replacements or modifications made by those skilled in the art without departing from the essential content of the application shall fall within the protection scope of the application.

Claims

1. A method for producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

2. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 1, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

3. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 2, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

4. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 1, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

5. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 1, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

6. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 1, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

7. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 6, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof.

8. The method of producing a high-toughness Al-Zn-Mn-Cu antibacterial aluminum alloy product according to claim 1, characterized by, The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. The application relates to a high-strength Al-Zn-Mn-Cu antibacterial aluminum alloy and a preparation method thereof. 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