Corrosion-resistant structural aluminum alloy and preparation method thereof

An aluminum alloy and corrosion-resistant technology, which is applied in the field of corrosion-resistant structural aluminum alloys and its preparation, can solve problems such as the difficulty in optimizing the mechanical properties and corrosion resistance of aluminum alloys at the same time, achieve improved local corrosion resistance, increase alloy strength, and increase strength Effect

Active Publication Date: 2017-12-08
福建祥鑫股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to propose a corrosion-resistant structural aluminum alloy and its preparation method. The corrosion-resistant structural aluminum alloy solves the problem that the mechanical properties and corrosion resistance of the aluminum alloy are difficult to optimize simultaneously. It has corrosion resistance, high strength, High plasticity; and the preparation method of the aluminum alloy has the characteristics of simple process and easy preparation, which is suitable for factory production

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  • Corrosion-resistant structural aluminum alloy and preparation method thereof
  • Corrosion-resistant structural aluminum alloy and preparation method thereof
  • Corrosion-resistant structural aluminum alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] The preparation method of corrosion-resistant structure aluminum alloy in embodiment 1 is as follows:

[0050] Weigh the raw materials of each alloy component, mix according to the mass percentage of each component of aluminum alloy, control the temperature of the melting crucible to 740°C, first put the aluminum ingot into the melting crucible to melt, then add Al-48%Cu, Al-8% Mn, Al-3%Cr, Al-3%Zr, Al-5%Yb, Al-5%Er, Al-4%Sn and Al-5%Ge master alloys, then add high-purity Zn, wait for it to melt and After fully stirring, finally add high-purity Mg for smelting, fully stir, degas, and slag during the smelting process, and obtain an alloy melt after the smelting of each alloy component is completed; cool the alloy melt to 720°C, and then Cast into ingots. After the ingot is sawed and milled, it is subjected to two-stage homogenization treatment, that is, firstly, it is kept at 410°C for 4h, then at 460°C for 24h, and then cooled. The ingot after the double-stage homogen...

Embodiment 2

[0051] The preparation method of corrosion-resistant structure aluminum alloy in embodiment 2 is as follows:

[0052] Weigh the raw materials of each alloy component, mix according to the mass percentage of each component of the aluminum alloy, control the temperature of the melting crucible to 800°C, first put the aluminum ingot into the melting crucible to melt, then add Al-48%Cu, Al-8% Mn, Al-3%Cr, Al-3%Zr, Al-5%Yb, Al-5%Er, Al-4%Sn and Al-5%Ge master alloys, then add high-purity Zn, wait for it to melt and After stirring well, add high-purity Mg at the end. Add the alloy components sequentially according to the order of melting point from high to low, finally add Mg, carry out smelting, fully stir, degas, and remove slag during the smelting process, and obtain the alloy melt after the smelting of each alloy component is completed; The alloy melt is cooled to 730°C and then cast into ingots. After the ingot is sawed and milled, it is subjected to two-stage homogenization ...

Embodiment 3

[0053] The preparation method of aluminum alloy in embodiment 3 is as follows:

[0054] Weigh the raw materials of each alloy component, mix according to the mass percentage of each component of the aluminum alloy, control the temperature of the melting crucible to 770°C, first put the aluminum ingot into the melting crucible to melt, then add Al-48%Cu, Al-8% Mn, Al-3%Cr, Al-3%Zr, Al-5%Yb, Al-5%Er, Al-4%Sn and Al-5%Ge master alloys, then add high-purity Zn, wait for it to melt and After stirring well, add high-purity Mg at the end. Add the alloy components sequentially according to the order of melting point from high to low, finally add Mg, carry out smelting, fully stir, degas, and remove slag during the smelting process, and obtain an alloy melt after the smelting of each alloy component is completed; The alloy melt was cooled to 722°C and then cast into ingots. After the ingot is sawed and milled, it is subjected to two-stage homogenization treatment, that is, it is firs...

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Abstract

The invention discloses a corrosion-resistant structural aluminum alloy and a preparation method thereof. The corrosion-resistant structural aluminum alloy comprises the following components, by mass percentage, 4-9% of Zn, 1.5-2.8% of Mg, 1-2.8% of Cu, 0.2-0.35% of Mn, 0-0.3% of Cr, 0.1-0.4% of Zr, 0.1-0.5% of Yb 0.1-0.5% of Er, 0.1-0.4% of Sn, 0.1-0.35% of Ge and the balance Al and inevitable impurities. The aluminum alloy has the advantages that the recrystallization fraction is low, the number of small-angle grain boundaries is large, and the expansion of corrosion cracks can be effectively resisted; the crystal boundary precipitation phase is large in size and discontinuous in distribution so that the expansion of the corrosion cracks can be further effectively hindered, and therefore the exfoliation corrosion resistance of the aluminum alloy can be obviously improved, and the evaluation grade can reach the P grade; and meanwhile, the hardness of the aluminum alloy is greater than or equal to 143HV, the yield strength Rp0.2 is greater than or equal to 387MPa, the tensile strength Rm is greater than or equal to 410MPa, and the elongation rate A is greater than or equal to 14.5%.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal materials, in particular to a corrosion-resistant structural aluminum alloy and a preparation method thereof. Background technique [0002] 7xxx series (Al-Zn-Mg) aluminum alloys have the advantages of low density, high specific strength, and easy processing, and are widely used in transportation, aerospace and other fields. In recent years, my country has vigorously developed the high-speed rail industry and the aviation industry. In the design and manufacture of high-speed trains and large aircraft, high requirements have been placed on the strength, toughness and corrosion resistance of 7xxx alloys. If the 7xxx series alloys can be guaranteed to have high strength and good corrosion resistance, it will be of great significance to the technical development of high-speed trains and large aircraft. [0003] The methods to improve the properties of 7xxx series aluminum alloys mainly incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
Inventor 刘胜胆汪庆柴文茹叶凌英唐建国杨臻珅陈景超邓运来
Owner 福建祥鑫股份有限公司
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