CN110964936B - Production process of high-strength corrosion-resistant aluminum alloy for power line hardware - Google Patents
Production process of high-strength corrosion-resistant aluminum alloy for power line hardware Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Abstract
The invention provides a production process of high-strength corrosion-resistant aluminum alloy for a power line fitting, which relates to the technical field of power lines and comprises the following steps: (1) smelting; (2) raising the temperature of the aluminum alloy liquid to 750-760 ℃, and adding a refining agent I to carry out primary refining treatment; performing modification treatment after refining; after modification, adding a refining agent II for secondary refining treatment, and slagging off; pouring; (3) placing the aluminum alloy casting in a heating furnace preheated to 200-; (4) and placing the aluminum alloy casting in a heating furnace for three times of aging treatment. The aluminum alloy produced by the invention has high mechanical strength, good wear resistance and corrosion resistance, and has good application effect in electric power circuit hardware fittings.
Description
Technical Field
The invention relates to the technical field of power lines, in particular to a production process of high-strength corrosion-resistant aluminum alloy for power line hardware fittings.
Background
The power line hardware fitting is applied to heavy metal construction on 220-750kV or even above high-voltage overhead transmission point lines and power distribution devices. The power transmission line is formed by connecting and combining various devices, transmission machinery, electrical loads and metal accessories with certain protection functions in an electric power system, and the power transmission line, the iron tower, the lead and the insulator together. According to the use function of electric power fittings, products are generally divided into nine major categories, such as suspension clamps, tension-resistant clamps, connecting fittings, splicing fittings, protective fittings and stay wire fittings, and are used for transmission and transformation projects of various power grades.
Due to the particularity of the electric power operation requirement, the mechanical performance and the electrical performance of the electric power circuit hardware are higher. The materials for producing the power line hardware fitting comprise common high-quality structural steel, cast aluminum alloy, malleable cast iron, copper-aluminum alloy and the like, wherein the cast aluminum alloy power line hardware fitting has the comprehensive advantages of good mechanical property, corrosion resistance and electrical property, so the cast aluminum alloy power line hardware fitting is widely applied to power lines.
The Chinese patent with the application number of 201010157588.3 discloses a corrosion-resistant aluminum alloy for high-voltage power line hardware and a preparation method thereof, wherein the corrosion-resistant aluminum alloy consists of the following components: silicon, magnesium, titanium, nickel, the balance being aluminum and unavoidable impurities. The preparation method comprises mixing the raw materials according to alloy components, heating and melting the components, keeping the temperature, casting, demolding, and aging for 2 times. On the basis of the existing aluminum-silicon alloy, the silicon content is greatly reduced, and a small amount of titanium, nickel and magnesium elements are added, so that the overall strength of the alloy is improved, and the brittleness is reduced; the titanium, nickel and magnesium elements can improve the electrode potential of the aluminum alloy matrix, improve the electrochemical corrosion resistance of the aluminum alloy, form intermetallic compounds and oxide films and further improve the oxidation resistance of the alloy; and after casting, the aging is carried out for two times, so that the room-temperature and low-temperature mechanical properties and the corrosion resistance of the alloy are effectively improved.
Chinese patent No. 201210359982.4 discloses a high strength cast aluminum alloy for electric power fittings and a method for manufacturing the same, wherein the aluminum alloy is composed of silicon, magnesium, strontium, iron and aluminum. When the aluminum liquid is manufactured, firstly, pure aluminum ingots are completely melted into aluminum liquid, then, silicon and magnesium elements with required dosage are put into the aluminum liquid to be fully melted, then, a proper amount of Al-Sr alterant is added to modify the aluminum liquid, and then, argon is introduced into the aluminum liquid to refine and degas the aluminum liquid so as to be used for casting electric power fittings. The aluminum alloy material has good casting manufacturability, and the cast workpiece is strengthened by proper heat treatment, so that the tensile strength of the aluminum alloy material reaches over 330MPa, the elongation is 2-5%, and the Brinell hardness is more than 80.
Chinese patent application No. 201710240186.1 discloses a high-strength aluminum alloy for power line hardware and a manufacturing method thereof, wherein the high-strength aluminum alloy consists of the following components: aluminum, silicon, manganese, enzymes, zirconium, copper, and the like. The aluminum alloy prepared by the method has excellent casting performance, high mechanical strength and good dimensional stability; during manufacturing, annealing treatment at different temperatures is carried out in the heat treatment process after pouring, and the temperature rise speed, the heat preservation time and the annealing mode are reasonably set, so that the alloy matrix structure is more stable, and the processing performance, the strength, the stress resistance and the corrosion resistance of a casting are effectively enhanced.
The cast aluminum alloy power line hardware has the advantages of high strength, light weight, small magnetic loss, excellent conductivity and no need of hot galvanizing. Based on the factors, the aluminum alloy electric power line hardware with more excellent performance is developed, and the application prospect is good.
Disclosure of Invention
The invention aims to provide a production process of a high-strength corrosion-resistant aluminum alloy for power line hardware, and the produced aluminum alloy has high mechanical strength, good wear resistance and corrosion resistance and good application effect in the power line hardware.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting an aluminum ingot into a vacuum melting furnace for melting, heating to 710-plus 720 ℃, heating to 760-plus 770 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 710-plus 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid;
(2) raising the temperature of the aluminum alloy liquid to 750-760 ℃, adding a refining agent I for primary refining treatment, wherein the refining time is 15-20 min; performing modification treatment after refining; adding refining agent II after modification for secondary refining for 8-10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 680-700 ℃, pouring the aluminum alloy liquid into a mold, and demolding to obtain an aluminum alloy casting;
(3) placing the aluminum alloy casting in a heating furnace preheated to 200-;
(4) placing the aluminum alloy casting in a heating furnace, raising the temperature to 200-225 ℃, preserving the heat for 3-4h, and carrying out primary aging treatment; transferring the aluminum alloy casting to a heating furnace at the temperature of 165-180 ℃, preserving heat for 3-4h, and performing secondary aging treatment; then transferring the aluminum alloy casting to a heating furnace with the temperature of 130-145 ℃, preserving the heat for 6-8h, carrying out third aging treatment, and finally air-cooling to the room temperature.
The high-strength corrosion-resistant aluminum alloy produced by the invention comprises the following chemical components in percentage by weight: 2.2 to 3.5 percent of silicon, 1.3 to 2.6 percent of copper, 1.3 to 2.2 percent of magnesium, 0.15 to 0.25 percent of manganese, 0.2 to 0.6 percent of zirconium, 0.15 to 0.35 percent of zinc, 0.05 to 0.12 percent of boron, 0.1 to 0.3 percent of rare earth, and the balance of aluminum and inevitable impurities.
Preferably, the high-strength corrosion-resistant aluminum alloy consists of the following chemical components in percentage by weight: 3.1% of silicon, 2.1% of copper, 1.5% of magnesium, 0.2% of manganese, 0.4% of zirconium, 0.3% of zinc, 0.08% of boron, 0.24% of rare earth, and the balance of aluminum and inevitable impurities.
Preferably, the mass fraction of silicon in the aluminum-silicon master alloy is 13-17%; the mass fraction of copper in the aluminum-copper intermediate alloy is 26-33%; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 10-15%; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 10-20%; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 3-5%; the mass fraction of rare earth in the aluminum-rare earth intermediate alloy is 2-3.5%. The rare earth in the aluminum-rare earth intermediate alloy is one or more of lanthanum, cerium, samarium, gadolinium, erbium, ytterbium, scandium and yttrium.
Preferably, the aluminum-silicon master alloy is preheated to 280 ℃ before being added, the aluminum-magnesium master alloy, the aluminum-manganese master alloy and the aluminum-zirconium master alloy are preheated to 230 ℃ before being added, and the boron simple substance, the zinc simple substance and the aluminum-rare earth master alloy are preheated to 260 ℃ before being added.
Preferably, the refining agent I consists of the following components in percentage by weight: 30-45% of magnesium chloride, 2-3% of rare earth oxide, 5-10% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is one or two of scandium oxide, yttrium oxide, lanthanum oxide and cerium oxide; the adding amount of the refining agent I is 0.1-0.3% of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.02-0.05% of the mass of the aluminum alloy liquid.
Preferably, the alterant used for the modification treatment consists of the following components in percentage by weight: 20-30% of magnesium chloride, 20-25% of potassium chloride, 5-10% of nickel oxide, 2-5% of lanthanum fluoride, 2-5% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.08-0.15% of the mass of the aluminum alloy liquid.
Preferably, in step (2), the mold is preheated to 320-.
Preferably, in the step (3), the time for twice converter of the aluminum alloy casting is controlled within 40 s. Namely, the time for transferring the aluminum alloy casting to 165-180 ℃ after the first aging treatment is finished and the time for transferring the aluminum alloy casting to 130-145 ℃ after the second aging treatment is finished are both controlled within 40 s.
The invention has the beneficial effects that:
in the smelting process of the production process, different materials are added according to a certain sequence and corresponding temperature setting, so that the burning loss of each metal can be reduced, and the size of each crystal grain can be controlled in a stable range. And then, the aluminum alloy casting is sequentially subjected to primary refining treatment, modification treatment and secondary refining treatment, impurities and gas in the aluminum alloy liquid are removed through refining, so that the modification treatment effect is good, the impurities generated in the modification process are removed through the secondary refining treatment, and the casting obtained through casting is uniform and stable in structure, few in defects, fine in crystal grains and stable in performance.
In the invention, appropriate refining agents are respectively selected in the primary refining treatment and the secondary refining treatment, so that hydrogen and oxidation slag inclusion in the aluminum alloy liquid are effectively removed, the modification effect of the modifier is good, crystal grains can be refined, the size of the crystal grains is effectively controlled, and the modifier does not contain sodium, so that the modification process is more stable.
In the heat treatment process, the temperature rise temperature is reasonably set, so that the aluminum alloy structure is uniformly refined, the intragranular segregation is effectively prevented, the solid solution temperature is strictly controlled, solute atoms can be dissolved into the solid solution to the maximum extent, and meanwhile, the alloy cannot be melted. After solid solution, the alloy is fog-cooled to room temperature, so that the mechanical strength, hardness, corrosion resistance and processability of the alloy are effectively improved. And after the solid solution treatment, the three times of aging treatment are carried out, the heating temperature and the heat preservation time are strictly controlled in the process, and the precipitation strengthening phase is separated out from the supersaturated solid solution and grows, so that the strength and the hardness are obviously improved, the stress of the aluminum alloy casting is almost eliminated, and the aging effect is good.
ZrAl formed by trace elements of zirconium and aluminum3The method can hinder the recrystallization process, refine the crystallized grains, improve the quenching sensitivity of the aluminum alloy and obviously improve the toughness and the corrosion resistance. Magnesium and zinc added to an aluminum alloy to form a strengthening phase Mg/Zn2Has obvious strengthening effect to ensure thatThe mechanical strength and the corrosion resistance of the aluminum alloy are improved. The added copper forms theta (Al) with aluminum2Cu) phase and theta phase have good solid solution strengthening effect and aging strengthening effect, and can effectively enhance the tensile strength and the yield strength of the aluminum alloy. The added rare earth elements can refine grains, and effectively improve the mechanical property and corrosion resistance of the aluminum alloy.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 720 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 15 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 30 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 12 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 20 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 5 percent; the mass fraction of the rare earth in the aluminum-rare earth intermediate alloy is 3%, and the mass ratio of the rare earth in the aluminum-rare earth intermediate alloy is 1: 1.
Preheating the aluminum-silicon intermediate alloy to 270 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy to 230 ℃ before adding the aluminum-silicon intermediate alloy, and preheating the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy to 250 ℃.
(2) Raising the temperature of the aluminum alloy liquid to 755 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 20 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 690 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 350 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 40% of magnesium chloride, 3% of scandium oxide, 8% of zinc and the balance of sodium fluoroaluminate; the adding amount of the refining agent I is 0.25 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.03 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 25% of magnesium chloride, 22% of potassium chloride, 8% of nickel oxide, 5% of lanthanum fluoride, 3% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.12% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 220 ℃, preserving heat for 50min, raising the temperature to 545 ℃ at the speed of 5 ℃/min, preserving heat for 5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, heating to 215 ℃, preserving heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 170 ℃, preserving the heat for 3.5 hours, and carrying out secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 140 ℃, preserving the heat for 8 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 2:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 710 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 715 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 15 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 28 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 10 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 20 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 3 percent; the mass fraction of rare earth in the aluminum-rare earth intermediate alloy is 3 percent. The rare earth in the aluminum-rare earth intermediate alloy is composed of samarium, gadolinium and erbium according to the mass ratio of 1:2: 1.
Preheating to 260 ℃ before adding the aluminum-silicon intermediate alloy, preheating to 230 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy, and preheating to 260 ℃ before adding the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy.
(2) Heating the temperature of the aluminum alloy liquid to 750 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 15 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 685 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 350 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 38% of magnesium chloride, 2% of rare earth oxide, 8% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is scandium oxide and yttrium oxide according to the mass ratio of 1: 8, preparing a mixture; the adding amount of the refining agent I is 0.15 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.04 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 28% of magnesium chloride, 23% of potassium chloride, 6% of nickel oxide, 5% of lanthanum fluoride, 3% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.1% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 220 ℃, keeping the temperature for 50min, heating to 545 ℃ at the speed of 4.5 ℃/min, keeping the temperature for 4.5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, raising the temperature to 205 ℃, preserving the heat for 3.5 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 170 ℃, preserving the heat for 3.5 hours, and carrying out secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 135 ℃, preserving the heat for 7 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 3:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 715 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 15 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 26 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 12 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 15 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 4 percent; the mass fraction of rare earth in the aluminum-rare earth master alloy is 3.5 percent. The rare earth in the aluminum-rare earth intermediate alloy is cerium.
Preheating to 270 ℃ before adding the aluminum-silicon intermediate alloy, preheating to 220 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy, and preheating to 245 ℃ before adding the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy.
(2) Raising the temperature of the aluminum alloy liquid to 755 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 18 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 9 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 690 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 340 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 35% of magnesium chloride, 2.5% of rare earth oxide, 8% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is formed by mixing yttrium oxide and lanthanum oxide according to the mass ratio of 5: 1; the adding amount of the refining agent I is 0.2 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.04 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 28% of magnesium chloride, 22% of potassium chloride, 8% of nickel oxide, 3% of lanthanum fluoride, 4% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.12% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 215 ℃, keeping the temperature for 50min, heating to 545 ℃ at the speed of 4 ℃/min, keeping the temperature for 5h, and then carrying out fog cooling to room temperature;
(4) placing the aluminum alloy casting in a heating furnace, heating to 220 ℃, preserving heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting to a heating furnace with the temperature of 175 ℃, preserving the heat for 4 hours, and carrying out secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 135 ℃, preserving the heat for 7 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 4:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting an aluminum ingot into a vacuum smelting furnace for smelting, heating to 720 ℃, heating to 760 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 715 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 17 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 28 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 15 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 15 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 4 percent; the mass fraction of rare earth in the aluminum-rare earth master alloy is 3.5 percent. The rare earth in the aluminum-rare earth master alloy is scandium and yttrium according to the mass ratio of 3: 1.
Preheating the aluminum-silicon intermediate alloy to 280 ℃ before adding the aluminum-silicon intermediate alloy, preheating the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy to 220 ℃ before adding the aluminum-magnesium intermediate alloy, and preheating the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy to 245 ℃.
(2) Raising the temperature of the aluminum alloy liquid to 755 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 15 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 9 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 700 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 320 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 45% of magnesium chloride, 3% of rare earth oxide, 8% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is yttrium oxide and cerium oxide in a mass ratio of 1: 1; the adding amount of the refining agent I is 0.2 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.02 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 25% of magnesium chloride, 20% of potassium chloride, 5% of nickel oxide, 2% of lanthanum fluoride, 5% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.08% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 230 ℃, keeping the temperature for 50min, heating to 545 ℃ at the speed of 4.5 ℃/min, keeping the temperature for 5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, raising the temperature to 225 ℃, preserving the heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 170 ℃, preserving the heat for 4 hours, and performing secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 135 ℃, preserving the heat for 8 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 5:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 720 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 710 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 13 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 26 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 12 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 10 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 3 percent; the mass fraction of rare earth in the aluminum-rare earth intermediate alloy is 2 percent. The rare earth in the aluminum-rare earth master alloy is cerium and yttrium in a mass ratio of 1: 1.
Preheating to 260 ℃ before adding the aluminum-silicon intermediate alloy, preheating to 200 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy, and preheating to 260 ℃ before adding the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy.
(2) Heating the temperature of the aluminum alloy liquid to 750 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 20 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 8 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 680 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 360 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 30% of magnesium chloride, 2% of cerium oxide, 10% of zinc, and the balance of sodium fluoroaluminate, wherein the rare earth oxide is cerium oxide; the adding amount of the refining agent I is 0.2 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.03 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 30% of magnesium chloride, 22% of potassium chloride, 8% of nickel oxide, 3% of lanthanum fluoride, 4% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.1% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 200 ℃, keeping the temperature for 60min, raising the temperature to 540 ℃ at the speed of 3.2 ℃/min, keeping the temperature for 4h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, raising the temperature to 200 ℃, preserving the heat for 3 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 165 ℃, preserving heat for 3 hours, and performing secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 145 ℃, preserving the heat for 6 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 6:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting an aluminum ingot into a vacuum melting furnace for melting, heating to 710 ℃, heating to 770 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 14 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 33 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 10 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 20 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 5 percent; the mass fraction of rare earth in the aluminum-rare earth intermediate alloy is 3 percent. The rare earth in the aluminum-rare earth intermediate alloy is cerium.
Preheating the aluminum-silicon intermediate alloy to 270 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy to 230 ℃ before adding the aluminum-silicon intermediate alloy, and preheating the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy to 240 ℃.
(2) Raising the temperature of the aluminum alloy liquid to 760 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 18 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 690 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 340 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 40% of magnesium chloride, 2-3% of lanthanum oxide, 5-10% of zinc and the balance of sodium fluoroaluminate; the adding amount of the refining agent I is 0.2 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.04 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 20% of magnesium chloride, 25% of potassium chloride, 10% of nickel oxide, 5% of lanthanum fluoride, 2% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.15% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 220 ℃, keeping the temperature for 30min, raising the temperature to 550 ℃ at the speed of 5.5 ℃/min, keeping the temperature for 4.5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, heating to 215 ℃, preserving heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 180 ℃, preserving the heat for 3.5 hours, and performing secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 130 ℃, preserving the heat for 7 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 7:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 715 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 15 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 30 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 12 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 20 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 5 percent; the mass fraction of the rare earth in the aluminum-rare earth intermediate alloy is 3%, and the mass ratio of the rare earth in the aluminum-rare earth intermediate alloy is 1: 1.
Preheating the aluminum-silicon intermediate alloy to 270 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy to 220 ℃ before adding the aluminum-silicon intermediate alloy, and preheating the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy to 255 ℃ before adding the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy.
(2) Raising the temperature of the aluminum alloy liquid to 755 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 15 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 9 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 690 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 350 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 40% of magnesium chloride, 2.5% of rare earth oxide, 8% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is one or two of scandium oxide, yttrium oxide, lanthanum oxide and cerium oxide; the adding amount of the refining agent I is 0.2 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.03 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 30% of magnesium chloride, 22% of potassium chloride, 8% of nickel oxide, 3% of lanthanum fluoride, 4% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.1% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 225 ℃, preserving heat for 40min, raising the temperature to 545 ℃ at the speed of 5 ℃/min, preserving heat for 4.5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, raising the temperature to 205 ℃, preserving the heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 180 ℃, preserving the heat for 3.5 hours, and performing secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 140 ℃, preserving the heat for 7 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
Example 8:
a production process of high-strength corrosion-resistant aluminum alloy for power line hardware comprises the following steps:
(1) putting the aluminum ingot into a vacuum melting furnace for melting, heating to 720 ℃, heating to 765 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid.
Wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 17 percent; the mass fraction of copper in the aluminum-copper intermediate alloy is 28 percent; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 15 percent; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 15 percent; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 4 percent; the mass fraction of rare earth in the aluminum-rare earth master alloy is 3.5 percent. The rare earth in the aluminum-rare earth master alloy is scandium and yttrium according to the mass ratio of 3: 1.
Preheating the aluminum-silicon intermediate alloy to 280 ℃ before adding the aluminum-silicon intermediate alloy, preheating the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy to 200 ℃ before adding the aluminum-silicon intermediate alloy, and preheating the boron simple substance, the zinc simple substance and the aluminum-rare earth intermediate alloy to 245 ℃.
(2) Raising the temperature of the aluminum alloy liquid to 755 ℃, and adding a refining agent I to carry out primary refining treatment, wherein the refining time is 16 min; performing modification treatment after refining; adding a refining agent II after modification for secondary refining treatment, wherein the refining time is 10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 685 ℃, pouring the aluminum alloy liquid into a mold, and preheating the mold to 340 ℃ before pouring; and demolding to obtain the aluminum alloy casting.
The refining agent I comprises the following components in percentage by weight: 35% of magnesium chloride, 3% of rare earth oxide, 8% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is scandium oxide and cerium oxide in a mass ratio of 1: 6; the adding amount of the refining agent I is 0.15 percent of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.03 percent of the mass of the aluminum alloy liquid.
The alterant used for the alteration treatment comprises the following components by weight percentage: 20% of magnesium chloride, 25% of potassium chloride, 10% of nickel oxide, 5% of lanthanum fluoride, 2% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.12% of the mass of the aluminum alloy liquid.
(3) Placing the aluminum alloy casting in a heating furnace preheated to 220 ℃, preserving heat for 45min, raising the temperature to 545 ℃ at the speed of 5 ℃/min, preserving heat for 5h, and then carrying out fog cooling to room temperature.
(4) Placing the aluminum alloy casting in a heating furnace, raising the temperature to 210 ℃, preserving the heat for 4 hours, and carrying out primary aging treatment; transferring the aluminum alloy casting into a heating furnace with the temperature of 170 ℃, preserving the heat for 3 hours, and carrying out secondary aging treatment; and transferring the aluminum alloy casting to a heating furnace with the temperature of 140 ℃, preserving the heat for 8 hours, carrying out third aging treatment, and finally air-cooling to the room temperature. Wherein the time of the two converters is controlled within 40 s.
The compositions of the high-strength corrosion-resistant aluminum alloys for electric power line hardware produced by the production methods in examples 1 to 8 are shown in table 1, in which the contents (wt%) of silicon, copper, magnesium, manganese, zirconium, zinc, boron, and rare earth in the aluminum alloys are shown, and the balance is aluminum and unavoidable impurities.
TABLE 1
And (3) performance testing:
cylindrical castings of aluminum alloys having the compositions shown in Table 1 and having the dimensions of phi 20mm x 50mm prepared by the preparation methods of examples 1 to 8 were subjected to corrosion resistance test, frictional wear test and mechanical property test
The corrosion resistance test is to determine the corrosion grade of the aluminum alloy according to the ASTM34-01 standard, the solution system is a mixed acid salt solution of 234g/L sodium chloride, 50g/L potassium nitrate and 6.5ml nitric acid, the test temperature is 25 ℃, the corrosion time is 60h, and the corrosion grade is judged.
In the friction and wear test, the friction and wear test conditions are as follows: a friction wear disc of No. 45 quenched steel is used, the load is 200N, the friction linear velocity is 0.4m/s, the test time is 20min, the relative humidity of the test environment is 28-35%, and the environmental temperature is 20-25%.
Specific mechanical properties and wear resistance are shown in table 2.
Table 2:
as can be seen from table 1, the aluminum alloys prepared in examples 1 to 9 of the present invention have high strength, good wear resistance, and good corrosion resistance, and the corrosion grade thereof can reach N grade (the surface of the aluminum alloy sample has no signs of pitting and corrosion, allows slight uniform corrosion, and has color change on the surface).
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A production process of high-strength corrosion-resistant aluminum alloy for power line hardware is characterized by comprising the following steps:
(1) putting an aluminum ingot into a vacuum melting furnace for melting, heating to 710-plus 720 ℃, heating to 760-plus 770 ℃ after complete melting, adding an aluminum-silicon intermediate alloy, adding an aluminum-copper intermediate alloy, an aluminum-magnesium intermediate alloy, an aluminum-manganese intermediate alloy and an aluminum-zirconium intermediate alloy after melting, cooling to 710-plus 720 ℃ after melting, adding a boron simple substance, a zinc simple substance and an aluminum-rare earth intermediate alloy, and melting to obtain an aluminum alloy liquid;
(2) raising the temperature of the aluminum alloy liquid to 750-760 ℃, adding a refining agent I for primary refining treatment, wherein the refining time is 15-20 min; performing modification treatment after refining; adding refining agent II after modification for secondary refining for 8-10 min; then slagging off is carried out; after slagging off, adjusting the temperature of the aluminum alloy liquid to 680-700 ℃, pouring the aluminum alloy liquid into a mold, and demolding to obtain an aluminum alloy casting;
(3) placing the aluminum alloy casting in a heating furnace preheated to 200-;
(4) placing the aluminum alloy casting in a heating furnace, raising the temperature to 200-225 ℃, preserving the heat for 3-4h, and carrying out primary aging treatment; transferring the aluminum alloy casting to a heating furnace at the temperature of 165-180 ℃, preserving heat for 3-4h, and performing secondary aging treatment; transferring the aluminum alloy casting to a heating furnace with the temperature of 130-145 ℃, preserving the heat for 6-8h, carrying out third aging treatment, and finally air-cooling to the room temperature;
the produced high-strength corrosion-resistant aluminum alloy consists of the following chemical components in percentage by weight: 2.2 to 3.5 percent of silicon, 1.3 to 2.6 percent of copper, 1.3 to 2.2 percent of magnesium, 0.15 to 0.25 percent of manganese, 0.2 to 0.6 percent of zirconium, 0.15 to 0.35 percent of zinc, 0.05 to 0.12 percent of boron, 0.1 to 0.3 percent of rare earth, and the balance of aluminum and inevitable impurities.
2. The production process of the high-strength corrosion-resistant aluminum alloy for the electric power line fittings according to claim 1, wherein the produced high-strength corrosion-resistant aluminum alloy consists of the following chemical components in percentage by weight: 3.1% of silicon, 2.1% of copper, 1.5% of magnesium, 0.2% of manganese, 0.4% of zirconium, 0.3% of zinc, 0.08% of boron, 0.24% of rare earth, and the balance of aluminum and inevitable impurities.
3. The process for producing the high-strength corrosion-resistant aluminum alloy for electric power line hardware as claimed in claim 1, wherein the mass fraction of silicon in the aluminum-silicon intermediate alloy is 13-17%; the mass fraction of copper in the aluminum-copper intermediate alloy is 26-33%; the mass fraction of magnesium in the aluminum-magnesium intermediate alloy is 10-15%; the mass fraction of manganese in the aluminum-manganese intermediate alloy is 10-20%; the mass fraction of zirconium in the aluminum-zirconium intermediate alloy is 3-5%; the mass fraction of rare earth in the aluminum-rare earth intermediate alloy is 2-3.5%.
4. The process of claim 1, wherein the rare earth in the aluminum-rare earth intermediate alloy is one or more of lanthanum, cerium, samarium, gadolinium, erbium, ytterbium, scandium, and yttrium.
5. The process for producing the high-strength corrosion-resistant aluminum alloy for the power line hardware as claimed in claim 1, wherein the aluminum-silicon intermediate alloy is preheated to 260-280 ℃ before being added, the aluminum-magnesium intermediate alloy, the aluminum-manganese intermediate alloy and the aluminum-zirconium intermediate alloy are preheated to 200-230 ℃ before being added, and the elemental boron, the elemental zinc and the aluminum-rare earth intermediate alloy are preheated to 240-260 ℃ before being added.
6. The process for producing the high-strength corrosion-resistant aluminum alloy for electric power line fittings according to claim 1, wherein the refining agent I comprises the following components in percentage by weight: 30-45% of magnesium chloride, 2-3% of rare earth oxide, 5-10% of zinc and the balance of sodium fluoroaluminate, wherein the rare earth oxide is one or two of scandium oxide, yttrium oxide, lanthanum oxide and cerium oxide; the adding amount of the refining agent I is 0.1-0.3% of the mass of the aluminum alloy liquid; the refining agent II is hexachloroethane, and the addition amount of the refining agent II is 0.02-0.05% of the mass of the aluminum alloy liquid.
7. The process for producing a high-strength corrosion-resistant aluminum alloy for electric power line hardware as claimed in claim 1, wherein the modifier used for modification treatment comprises the following components in percentage by weight: 20-30% of magnesium chloride, 20-25% of potassium chloride, 5-10% of nickel oxide, 2-5% of lanthanum fluoride, 2-5% of cerium chloride and the balance of magnesium fluoride, wherein the addition amount of the modifier is 0.08-0.15% of the mass of the aluminum alloy liquid.
8. The process for producing a high-strength corrosion-resistant aluminum alloy for electric power line fittings as claimed in claim 1, wherein in the step (2), the mold is preheated to 320-360 ℃ before casting.
9. The process for producing a high-strength corrosion-resistant aluminum alloy for electric power line hardware as claimed in claim 1, wherein in the step (3), the time for twice converter casting of the aluminum alloy is controlled within 40 s.
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