Corrosion-resistant high-welding-performance aluminum alloy and production process thereof

Abstract

The invention provides a corrosion-resistant high-welding-performance aluminum alloy and a production process thereof, and the corrosion-resistant high-welding-performance aluminum alloy comprises the following components in percentage by mass: 0.15 to 0.25 percent of Si, less than or equal to 0.25 percent of Fe, 0.10 to 0.20 percent of Cu, 0.90 to 1.20 percent of Mn, 0.02 to 0.20 percent of Mg, 0.01 to 0.10 percent of La, 0.01 to 0.10 percent of Ce, less than or equal to 0.05 percent of Zn and the balance of Al and inevitable impurities. A certain amount of cerium and lanthanum are added into the aluminum alloy, so that the corrosion resistance and the welding performance of the aluminum alloy can be improved.

Description

Technical Field

[0001] The invention relates to an aluminum alloy, in particular to a corrosion-resistant aluminum alloy with high welding performance and a production process thereof. Background Art

[0002] Aluminum alloy is an alloy with aluminum as the base and other alloying elements added. It is one of the light metal materials. However, the most frequently used aluminum alloy on the market is 6063 aluminum alloy, which has the problems of low corrosion resistance and poor welding performance. Summary of the invention

[0003] In view of this, the first object of the present invention is to provide a corrosion-resistant and high-weldability aluminum alloy, which has the advantages of high corrosion resistance and good welding performance.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a corrosion-resistant and high-weldability aluminum alloy, characterized in that: calculated by mass percentage, it includes Si: 0.15-0.25%, Fe: ≤0.25%, Cu: 0.10-0.20%, Mn: 0.90-1.20%, Mg: 0.02-0.20%, La: 0.01-0.10%, Ce: 0.01-0.10% and Zn: ≤0.05%, and the remainder is Al and unavoidable impurities.

[0005] By using the above technical solution, a certain amount of cerium and lanthanum are added to the aluminum alloy to improve the corrosion resistance and welding performance of the aluminum alloy.

[0006] Preferably, in mass percentage, it includes Si: 0.1%, Fe: 0.15%, Cu: 0.16%, Mn: 1.1%, Mg: 0.1%, La: 0.02% and Ce: 0.03%, and the remainder is Al and inevitable impurities.

[0007] Through the above technical solution, the content of cerium element is controlled at 0.03%, and the content of lanthanum element is controlled at 0.02%, which can make the aluminum alloy have better corrosion resistance and welding performance.

[0008] The second object of the present invention is to provide a method for producing a corrosion-resistant and high-weldability aluminum alloy, which has the advantage of high production capacity.

[0009] The technical solution of the present invention is: a production process of the above-mentioned corrosion-resistant high-weldability aluminum alloy comprises the following steps: Step 1: Put the silicon-copper master alloy and the magnesium bar into a melting furnace, and increase the temperature of the melting furnace to melt the silicone master alloy and the magnesium bar completely; Step 2: putting the cerium ingot and the lanthanum ingot into the melting furnace, and raising the temperature of the melting furnace again to melt the cerium ingot and the lanthanum ingot completely; Step 3, adding the steel ingot and the manganese ingot into the melting furnace, and further increasing the temperature of the melting furnace to melt the steel ingot and the manganese ingot completely; Step 4, putting the aluminum ingot and the slag-making agent into a melting furnace, and obtaining a molten liquid after the aluminum ingot is melted; Step 5, transferring the molten liquid to a VD furnace, adding a deoxidizer to the molten liquid, and maintaining it for 1 to 3 hours; Step 6, adding a covering agent to the top of the molten liquid and continuing to keep warm for 1 to 2 hours; Step 7, pouring the molten liquid into a mold and allowing it to cool naturally to obtain a blank aluminum rod; Step 8, placing the blank aluminum rod in a holding furnace, keeping it at 550-580°C for 6 hours and then rapidly cooling it; Step nine, placing the blank aluminum rod in a heating furnace until the blank aluminum rod is heated to 430-480° C.; Step ten, extruding the blank aluminum rod through an extruder to obtain a semi-finished aluminum rod; Step 11, using a water quenching cooling pool to cool the semi-finished aluminum rod; Step 12, placing the semi-finished aluminum rod in a heat preservation furnace for aging treatment; Step 13, soak the semi-finished aluminum rod in 98% concentrated sulfuric acid for 10 to 15 minutes and then take it out; Step 14: rinse with clean water and let stand to dry to obtain a finished aluminum rod.

[0010] Through the above technical solution, the above method is used to produce and process aluminum alloy, which has the advantage of higher production capacity.

[0011] Preferably, the aging treatment process in step twelve is as follows: first, the semi-finished aluminum rod is kept at 175-185°C for 4 hours; then, the semi-finished aluminum rod is kept at 185-195°C for 3 hours; thereafter, the semi-finished aluminum rod is kept at 195-205°C for 1.5 hours, and finally, the semi-finished aluminum rod is taken out and forced air-cooled.

[0012] Through the above technical solution, the electrical conductivity of the aluminum alloy can be improved by performing a step-by-step aging treatment on the aluminum alloy.

[0013] Preferably, the melting furnace includes a combustion furnace body and a melting furnace body, the upper end of the combustion furnace body is recessed to form an installation chamber, the lower section of the melting furnace body is fixedly embedded in the installation chamber, the upper end of the melting furnace body is provided with a feed port, the lower end of the melting furnace body is provided with a discharge port, the discharge port is provided with a discharge pipe, and the discharge pipe passes downward through the combustion furnace body.

[0014] According to the above technical solution, when in use, the raw materials are put into the melting furnace body through the feed port, and the molten liquid is discharged from the melting furnace body through the discharge port. The discharge pipe passes through the combustion furnace body downward, so that in the process of discharging the molten liquid, the combustion furnace body can be used to keep the molten liquid warm. The lower section of the melting furnace body is fixedly embedded in the installation chamber, so that there is a larger contact area between the melting furnace body and the combustion furnace body, the heating is more efficient, and the production capacity of aluminum alloy can be improved to a certain extent.

[0015] Preferably, the lower section of the melting furnace body is reduced in diameter to form a collecting section, and the discharge port is arranged at the center of the lower end of the melting furnace body.

[0016] Through the above technical solution, the lower section of the melting furnace body is reduced in diameter to form a collecting section, and the discharge port is arranged at the center of the lower end of the melting furnace body. Such a design is conducive to the discharge of the molten liquid and reduces material accumulation.

[0017] Preferably, a mounting bracket is provided at the upper end of the melting furnace body, a servo motor is provided at the upper end of the mounting bracket, the output end of the servo motor passes downward through the mounting bracket, a transfer shaft is passed through the center of the upper end of the melting furnace body, the upper end of the transfer shaft is connected to the output end of the servo motor through a coupling, the lower end of the transfer shaft extends to the lower end of the collecting section, and a stirring head is provided at the lower end of the transfer shaft.

[0018] Through the above technical solution, when in use, the servo motor drives the adapter shaft to rotate circumferentially through the coupling. At the same time, the adapter shaft drives the stirring head to rotate circumferentially in the melting furnace body to stir the molten liquid in the melting furnace body, so that the various materials in the molten liquid are more fully integrated.

[0019] Preferably, a guide column is provided at the upper end of the melting furnace body, and the mounting bracket is slidably connected to the melting furnace body through the guide column. An actuator cylinder is provided at the upper end of the melting furnace body, and an output end of the actuator cylinder is connected to the mounting bracket through a connecting plate.

[0020] Through the above technical solution, when in use, the execution cylinder can drive the mounting bracket to move up and down through the connecting plate. At the same time, the mounting bracket will drive the stirring head to move up and down through the adapter shaft to more fully stir the material in the melting furnace body.

[0021] Preferably, the stirring head includes a stirring seat fixedly mounted on the lower end of the adapter shaft and a stirring cover fixedly mounted on the outside of the stirring seat, the outer wall shape of the stirring cover is adapted to the inner wall shape of the melting furnace body, and the stirring cover is penetrated from top to bottom with a plurality of through holes, and the plurality of through holes are evenly distributed along the circumference of the stirring cover.

[0022] Through the above technical solution, when feeding materials into the melting furnace body through the feed port, the materials can pass through a number of through holes and then enter between the melting furnace body and the stirring hood. At this time, the distance between the materials and the combustion furnace body is smaller, and they can be heated and melted more efficiently, which helps to improve the production capacity of aluminum alloys.

[0023] Preferably, a receiving groove is provided at the center of the lower end of the adapter shaft, and a return spring and a movable core rod are arranged in the receiving groove in sequence, and the two ends of the return spring respectively contact the adapter shaft and the movable core rod, and the return spring drives the lower end of the movable core rod to extend out of the receiving groove through elastic force, and a guide slider is provided at the bottom inner groove wall of the receiving groove, and a spiral guide groove is provided at the bottom outer wall of the movable core rod, and the guide slider is slidably arranged in the spiral guide groove, and a partition bracket is fixedly sleeved at the lower end of the movable core rod, and the inner wall shape of the partition bracket is adapted to the outer wall shape of the stirring cover, and a baffle is fixedly arranged at the partition bracket opposite to the through hole, and a transfer seat is rotatably connected at the center of the lower end of the collecting section, and a receiving groove is provided at the upper end of the transfer seat, and the receiving groove is used for the lower end of the movable core rod to be inserted.

[0024] According to the above technical solution, when feeding materials into the melting furnace body through the feed port, the mounting bracket is controlled to move upward by the execution cylinder. At this time, the adapter shaft will move upward with the mounting bracket, and the movable core rod will initially remain plugged and fixed in the receiving groove under the elastic force of the reset spring. In this way, the movable core rod and the adapter shaft slide axially relative to each other, and the movable core rod will rotate circumferentially in the receiving groove under the action of the guide slider and the spiral guide groove, so that the baffle and the through hole are staggered. In this way, the material entering the melting furnace body will enter between the partition bracket and the melting furnace body through the through hole, and obtain more efficient heating. When the guide slider collides with the lower end of the spiral guide groove, the movable core rod will move upward with the adapter shaft.

[0025] After the feeding is completed, the mounting bracket is controlled to move downward by executing the cylinder. At this time, the movable core rod and the adapter shaft will move downward with the mounting bracket. When the lower end of the movable core rod is inserted and fixed inside the receiving groove, the downward movement of the movable core rod stops, and the adapter shaft will continue to move downward with the mounting bracket. In this way, the movable core rod and the adapter shaft slide axially relative to each other, and the movable core rod will rotate circumferentially in the receiving groove under the action of the guide slider and the spiral guide groove, so that the baffle gradually moves to the bottom of the corresponding through hole. When the guide slider collides with the upper end of the spiral guide groove, the downward movement of the adapter shaft stops, and the baffle blocks the through hole. At this time, the partition bracket cooperates with the stirring hood to limit the material from staying between the stirring hood and the melting furnace body, thereby obtaining more efficient heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a melting furnace; Figure 2 for Figure 1 A magnified view of part A; Figure 3 is a partial schematic diagram of a melting furnace; Figure 4 for Figure 3 Enlarged view of part B.

[0027] Figure numerals: 1. combustion furnace body; 2. melting furnace body; 3. installation chamber; 4. feed port; 5. discharge port; 6. discharge pipe; 7. collecting section; 8. installation bracket; 9. servo motor; 10. adapter shaft; 11. stirring head; 111. stirring seat; 112. stirring cover; 12. guide column; 13. actuator cylinder; 14. through hole; 15. storage groove; 16. reset spring; 17. movable core rod; 18. guide slider; 19. spiral guide slide; 20. partition bracket; 21. baffle; 22. adapter seat; 23. receiving groove; 24. connecting plate. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0029] Embodiment 1: A corrosion-resistant aluminum alloy with high welding performance, comprising, by mass percentage, Si: 0.15-0.25%, Fe: ≤0.25%, Cu: 0.10-0.20%, Mn: 0.90-1.20%, Mg: 0.02-0.20%, La: 0.01-0.10%, Ce: 0.01-0.10% and Zn: ≤0.05%, with the remainder being Al and unavoidable impurities.

[0030] In this embodiment, the aluminum alloy includes, by mass percentage, Si: 0.1%, Fe: 0.15%, Cu: 0.16%, Mn: 1.1%, Mg: 0.1%, La: 0.02% and Ce: 0.03%, and the remainder is Al and inevitable impurities.

[0031] Embodiment 2: A production process of the corrosion-resistant and high-weldability aluminum alloy as described in Embodiment 1, comprising the following steps: Step 1: Put the silicon-copper master alloy and the magnesium bar into a melting furnace, and increase the temperature of the melting furnace to melt the silicone master alloy and the magnesium bar completely; Step 2: putting the cerium ingot and the lanthanum ingot into the melting furnace, and raising the temperature of the melting furnace again to melt the cerium ingot and the lanthanum ingot completely; Step 3, adding the steel ingot and the manganese ingot into the melting furnace, and further increasing the temperature of the melting furnace to melt the steel ingot and the manganese ingot completely; Step 4, putting the aluminum ingot and the slag-making agent into a melting furnace, and obtaining a molten liquid after the aluminum ingot is melted; Step 5, transferring the molten liquid to a VD furnace, adding a deoxidizer to the molten liquid, and maintaining it for 1 to 3 hours; Step 6, adding a covering agent to the top of the molten liquid and continuing to keep warm for 1 to 2 hours; Step 7, pouring the molten liquid into a mold and allowing it to cool naturally to obtain a blank aluminum rod; Step 8, placing the blank aluminum rod in a holding furnace, keeping it at 550-580°C for 6 hours and then rapidly cooling it; Step nine, placing the blank aluminum rod in a heating furnace until the blank aluminum rod is heated to 430-480° C.; Step ten, extruding the blank aluminum rod through an extruder to obtain a semi-finished aluminum rod; Step 11, using a water quenching cooling pool to cool the semi-finished aluminum rod; Step 12, placing the semi-finished aluminum rod in a heat preservation furnace for aging treatment; Step 13, soak the semi-finished aluminum rod in 98% concentrated sulfuric acid for 10 to 15 minutes and then take it out; Step 14: rinse with clean water and let stand to dry to obtain a finished aluminum rod.

[0032] The aging treatment process in step twelve is as follows: first, the semi-finished aluminum rod is kept at 175-185°C for 4 hours; then, the semi-finished aluminum rod is kept at 185-195°C for 3 hours; then, the semi-finished aluminum rod is kept at 195-205°C for 1.5 hours, and finally, the semi-finished aluminum rod is taken out and forced air-cooled.

[0033] like Figures 1 to 4 As shown, the melting furnace comprises a combustion furnace body 1 and a melting furnace body 2. The upper end of the combustion furnace body 1 is recessed to form an installation chamber 3. The lower section of the melting furnace body 2 is fixedly embedded in the installation chamber 3. The upper end of the melting furnace body 2 is provided with a feed port 4. The lower end of the melting furnace body 2 is provided with a discharge port 5. A discharge pipe 6 is provided at the discharge port 5. The discharge pipe 6 runs downward through the combustion furnace body 1. The lower section of the melting furnace body 2 is reduced in diameter to form a collecting section 7. The discharge port 5 is provided at the center of the lower end of the melting furnace body 2.

[0034] A mounting bracket 8 is provided at the upper end of the melting furnace body 2, a servo motor 9 is provided at the upper end of the mounting bracket 8, the output end of the servo motor 9 passes through the mounting bracket 8 downward, a transfer shaft 10 is passed through the center of the upper end of the melting furnace body 2, the upper end of the transfer shaft 10 is connected to the output end of the servo motor 9 through a coupling, the lower end of the transfer shaft 10 extends to the lower end of the collecting section 7, and a stirring head 11 is provided at the lower end of the transfer shaft 10.

[0035] A guide column 12 is provided at the upper end of the melting furnace body 2, and the mounting bracket 8 is slidably connected to the melting furnace body 2 through the guide column 12. An actuator cylinder 13 is provided at the upper end of the melting furnace body 2, and the output end of the actuator cylinder 13 is connected to the mounting bracket 8 through a connecting plate 24.

[0036] The stirring head 11 includes a stirring seat 111 fixedly sleeved on the lower end of the adapter shaft 10, and a stirring cover 112 fixedly sleeved on the outside of the stirring seat 111. The outer wall shape of the stirring cover 112 is adapted to the inner wall shape of the melting furnace body 2. The stirring cover 112 is penetrated from top to bottom with a plurality of through holes 14, and the plurality of through holes 14 are evenly distributed along the circumference of the stirring cover 112.

[0037] A receiving groove 15 is provided at the center of the lower end of the adapter shaft 10, and a return spring 16 and a movable core rod 17 are arranged in sequence in the receiving groove 15. The two ends of the return spring 16 respectively resist the adapter shaft 10 and the movable core rod 17. The return spring 16 drives the lower end of the movable core rod 17 to extend out of the receiving groove 15 through elastic force. A guide slider 18 is provided at the bottom inner groove wall of the receiving groove 15, and a spiral guide groove 19 is provided at the bottom outer wall of the movable core rod 17. The guide slider 18 is slidably arranged in the spiral guide groove 19. A partition bracket 20 is fixedly sleeved at the lower end of the movable core rod 17. The inner wall shape of the partition bracket 20 is adapted to the outer wall shape of the stirring cover 112. A baffle 21 is fixedly provided at the partition bracket 20 opposite to the through hole 14. A transfer seat 22 is rotatably connected at the center of the lower end of the collecting section 7. A receiving groove 23 is provided at the upper end of the transfer seat 22. The receiving groove 23 is used for inserting the lower end of the movable core rod 17.

[0038] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A corrosion-resistant aluminum alloy with high welding performance, characterized by: Calculated by mass percentage, it includes Si: 0.15-0.25%, Fe: ≤0.25%, Cu: 0.10-0.20%, Mn: 0.90-1.20%, Mg: 0.02-0.20%, La: 0.01-0.10%, Ce: 0.01-0.10% and Zn: ≤0.05%, and the remainder is Al and inevitable impurities.

2. The corrosion-resistant and high-weldability aluminum alloy according to claim 1 is characterized in that: Calculated by mass percentage, it includes Si: 0.1%, Fe: 0.15%, Cu: 0.16%, Mn: 1.1%, Mg: 0.1%, La: 0.02% and Ce: 0.03%, and the remainder is Al and inevitable impurities.

3. A production process of the corrosion-resistant high-weldability aluminum alloy according to any one of claims 1 to 2, characterized in that: The following steps are included: Step 1: Put the silicon-copper master alloy and the magnesium bar into a melting furnace, and increase the temperature of the melting furnace to melt the silicone master alloy and the magnesium bar completely; Step 2: putting the cerium ingot and the lanthanum ingot into the melting furnace, and raising the temperature of the melting furnace again to melt the cerium ingot and the lanthanum ingot completely; Step 3, adding the steel ingot and the manganese ingot into the melting furnace, and further increasing the temperature of the melting furnace to melt the steel ingot and the manganese ingot completely; Step 4, putting the aluminum ingot and the slag-making agent into a melting furnace, and obtaining a molten liquid after the aluminum ingot is melted; Step 5, transferring the molten liquid to a VD furnace, adding a deoxidizer to the molten liquid, and maintaining it for 1 to 3 hours; Step 6, adding a covering agent to the top of the molten liquid and continuing to keep warm for 1 to 2 hours; Step 7, pouring the molten liquid into a mold and allowing it to cool naturally to obtain a blank aluminum rod; Step 8, placing the blank aluminum rod in a holding furnace, keeping it at 550-580°C for 6 hours and then rapidly cooling it; Step nine, placing the blank aluminum rod in a heating furnace until the blank aluminum rod is heated to 430-480° C.; Step ten, extruding the blank aluminum rod through an extruder to obtain a semi-finished aluminum rod; Step 11, using a water quenching cooling pool to cool the semi-finished aluminum rod; Step 12, placing the semi-finished aluminum rod in a heat preservation furnace for aging treatment; Step 13, soak the semi-finished aluminum rod in 98% concentrated sulfuric acid for 10 to 15 minutes and then take it out; Step 14, rinse with clean water and let stand to dry to obtain a finished aluminum rod.

4. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 3 is characterized by: The aging treatment process in step twelve is as follows: first, the semi-finished aluminum rod is kept at 175-185° C. for 4 hours; then, the semi-finished aluminum rod is kept at 185-195° C. for 3 hours; then, the semi-finished aluminum rod is kept at 195-205° C. for 1.5 hours, and finally, the semi-finished aluminum rod is taken out and forced air-cooled.

5. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 3 is characterized by: The melting furnace comprises a combustion furnace body (1) and a melting furnace body (2); the upper end of the combustion furnace body (1) is recessed to form an installation chamber (3); the lower section of the melting furnace body (2) is fixedly embedded in the installation chamber (3); the upper end of the melting furnace body (2) is provided with a feed port (4); the lower end of the melting furnace body (2) is provided with a discharge port (5); the discharge port (5) is provided with a discharge pipe (6); and the discharge pipe (6) passes downward through the combustion furnace body (1).

6. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 5 is characterized by: The lower section of the melting furnace body (2) is reduced in diameter to form a collecting section (7), and the discharge port (5) is arranged at the center of the lower end of the melting furnace body (2).

7. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 6 is characterized by: The upper end of the melting furnace body (2) is provided with a mounting bracket (8), the upper end of the mounting bracket (8) is provided with a servo motor (9), the output end of the servo motor (9) passes through the mounting bracket (8) downward, and a transfer shaft (10) is passed through the center of the upper end of the melting furnace body (2), the upper end of the transfer shaft (10) is connected to the output end of the servo motor (9) through a coupling, and the lower end of the transfer shaft (10) extends to the lower end of the collecting section (7), and the lower end of the transfer shaft (10) is provided with a stirring head (11).

8. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 7 is characterized by: A guide column (12) is provided at the upper end of the melting furnace body (2), and the mounting bracket (8) is slidably connected to the melting furnace body (2) via the guide column (12). An actuator cylinder (13) is provided at the upper end of the melting furnace body (2), and an output end of the actuator cylinder (13) is connected to the mounting bracket (8) via a connecting plate (24).

9. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 8, characterized in that: The stirring head (11) comprises a stirring seat (111) fixedly sleeved on the lower end of the adapter shaft (10), and a stirring cover (112) fixedly sleeved on the outside of the stirring seat (111); the outer wall shape of the stirring cover (112) is adapted to the inner wall shape of the melting furnace body (2); the stirring cover (112) is penetrated by a plurality of through holes (14) from top to bottom, and the plurality of through holes (14) are evenly distributed along the circumference of the stirring cover (112).

10. The production process of a corrosion-resistant and high-weldability aluminum alloy according to claim 9, characterized in that: A receiving groove (15) is provided at the center of the lower end of the transfer shaft (10), and a return spring (16) and a movable core rod (17) are arranged in sequence in the receiving groove (15). The two ends of the return spring (16) respectively contact the transfer shaft (10) and the movable core rod (17). The return spring (16) drives the lower end of the movable core rod (17) to extend out of the receiving groove (15) through elastic force. A guide slider (18) is provided at the bottom inner groove wall of the receiving groove (15), and a spiral guide groove (19) is provided at the bottom outer wall of the movable core rod (17). The guide slider (18) is slidably arranged in the spiral guide groove (19); a partition bracket (20) is fixedly sleeved on the lower end of the movable core rod (17); the inner wall shape of the partition bracket (20) is adapted to the outer wall shape of the stirring cover (112); a baffle (21) is fixedly arranged on the partition bracket (20) opposite to the through hole (14); a transfer seat (22) is rotatably connected to the center of the lower end of the collecting section (7); a receiving groove (23) is provided on the upper end of the transfer seat (22); and the receiving groove (23) is used for the lower end of the movable core rod (17) to be inserted.

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