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Isotropic super corrosion-resistant aluminum alloy rolled plate and preparation method

An isotropic, aluminum alloy technology, applied in the field of aluminum alloy materials, can solve the problems of isotropy, strength and corrosion resistance, and the comprehensive performance of aluminum alloy is not ideal, so as to achieve good resistance to intergranular corrosion and peeling The effect of corrosion performance

Active Publication Date: 2019-04-30
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to invent an isotropic ultra-strong corrosion-resistant aluminum alloy for the problems that the comprehensive properties of ultra-high-strength Al-Zn-Mg-Cu aluminum alloys are not ideal enough, and it is difficult to balance isotropy, strength and corrosion resistance. Rolled plate and method of preparation

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  • Isotropic super corrosion-resistant aluminum alloy rolled plate and preparation method
  • Isotropic super corrosion-resistant aluminum alloy rolled plate and preparation method
  • Isotropic super corrosion-resistant aluminum alloy rolled plate and preparation method

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Embodiment 1

[0025] A method for preparing an isotropic super corrosion-resistant aluminum alloy rolled plate:

[0026] Take 28kg aluminum alloy as an example.

[0027] First, 20.9 kg A00 grade pure Al (composition: 99.79%Al, 0.14%Fe, 0.04%Si, all components in the present invention are represented by mass percentage, the same below, and the parts where the sum of components is less than 100% are impurities ) after melting, add 0.85 kg Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy (the loss rate of Cu is about 6.25%), 0.49 kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (the loss rate of Sr is about 75%), 1.48 kg Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy ( The loss rate of Zr is about 8%). The master alloy can be purchased directly from the market, or can be self-prepared by conventional methods. After these alloys are completely melted, 3.71 kg of pure Zn (the loss rate of Zn is about 8%) and 1.16 kg of pure Mg (the loss rate of Mg is about 20%)...

Embodiment 2

[0031] A method for preparing an isotropic super corrosion-resistant aluminum alloy rolled plate:

[0032] Take 28kg aluminum alloy as an example.

[0033] First melt 20.12 kg A00 grade pure Al (composition: 99.79%Al, 0.14%Fe, 0.04%Si) and then add 1.69kgAl-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) in the middle alloy (Cu loss rate is about 6.25%), 0.68 kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (Sr loss rate is about 75%), 1.33 kg Al - Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) master alloy (the loss rate of Zr is about 8%). The master alloy can be purchased directly from the market, or it can be made by yourself by conventional methods. preparation. After all these alloys were melted, 3.81 kg of pure Zn (the loss rate of Zn was about 8%) and 1 kg of pure Mg (the loss rate of Mg was about 20%) were sequentially added. Due to the low density and flammability of Mg, the casting process It is necessary to prevent it from floating on the surface and burnt. After...

Embodiment 3

[0037] A method for preparing an isotropic super corrosion-resistant aluminum alloy rolled plate:

[0038] Take 28kg aluminum alloy as an example.

[0039] First melt 20.51 kg A00 grade pure Al (composition: 99.79%Al, 0.14%Fe, 0.04%Si) and then add 1.27kgAl-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) in the middle alloy (Cu loss rate is about 6.25%), 0.585 kg Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy (Sr loss rate is about 75%), 1.405 kg Al - Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) master alloy (the loss rate of Zr is about 8%). The master alloy can be purchased directly from the market, or it can be made by yourself by conventional methods. preparation. After all these alloys are melted, add 3.76kg of pure Zn (the loss rate of Zn is about 8%) and 1.08kg of pure Mg (the loss rate of Mg is about 20%). During the process, it is necessary to prevent it from floating on the surface and burning. After the pure Mg is completely melted, hexachloroethane is added to...

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Abstract

The invention relates to an isotropic super-strong corrosion-resistant aluminum alloy rolled plate and a preparation method thereof. The isotropic super-strong corrosion-resistant aluminum alloy rolled plate is characterized in that an alloy is mainly composed of, by mass percentage, 12.18-12.51% of zinc, 2.85-3.31% of magnesium, 1.43-2.83% of copper, 0.18-0.20% of zirconium, 0.0435-0.0598% of strontium (Sr) and the balance aluminum and a small amount of impurity elements. The alloy preparation method sequentially comprises the steps of (1) carrying out casting; (2) carrying out homogenizing annealing; (3) carrying out extrusion processing, wherein the extrusion ratio is 12; (4) carrying out rolling processing; (50 carrying out solid solution treatment; and (6) carrying out aging treatment. According to the isotropic super-strong corrosion-resistant aluminum alloy rolled plate and the preparation method thereof, the prepared alloy is fine in grain, the grain size is less than 10 microns in the X, Y and Z directions, the average grain size in the three directions is similar and is 8.2 microns, 8.7 microns and 9.5 microns correspondingly, the tensile strength in the X direction and the Y direction is also very approximate and is 745Mpa and 760Mpa correspondingly, certain isotropy is showed, and the highest strength can reach 809.2Mpa under the aging treatment of 121DEG C*5h+133 DEG C*16h; and the intergranular corrosion depth is 109.2 microns, the exfoliation corrosion grade is EA, and the good intergranular corrosion resistance and the good exfoliation corrosion resistance can be achieved.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a method for preparing a 7000 series aluminum alloy rolled plate, in particular to an isotropic super corrosion-resistant aluminum alloy rolled plate and its preparation method. Background technique [0002] High-strength aluminum alloy has the characteristics of low density, high strength, high toughness, corrosion resistance, easy processing, low cost, easy recycling, and environmental friendliness. It is the main structural material of aircraft. For a long time, the development of aluminum alloys with higher strength levels has attracted much attention. Al-Zn-Mg-Cu series aluminum alloys have been widely used in aviation, aerospace and transportation fields. In order to meet the development needs of related industries, it is necessary to develop such alloys with better performance. [0003] In order to ensure that the 7000 series aluminum alloy has ultra-high strength, the conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/053
Inventor 许晓静居士浩陈瑞芳蔡成彬黄锦栋张可人丁清汪成松刘志刚张晓宇童浩
Owner JIANGSU UNIV