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High-hardness corrosion resistant 7000 series aluminum alloy and production method thereof

An aluminum alloy and high-hardness technology, which is applied in the field of high-hardness and corrosion-resistant 7000 series aluminum alloys and its preparation, can solve the problems of difficulty in combining high hardness and high corrosion resistance.

Active Publication Date: 2010-09-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-hardness and corrosion-resistant 7000-series aluminum alloy with added trace elements and a preparation method thereof for the existing 7000-series aluminum alloys that are difficult to balance high hardness and high corrosion resistance.

Method used

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  • High-hardness corrosion resistant 7000 series aluminum alloy and production method thereof
  • High-hardness corrosion resistant 7000 series aluminum alloy and production method thereof
  • High-hardness corrosion resistant 7000 series aluminum alloy and production method thereof

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Experimental program
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Embodiment 1

[0024] Such as figure 1 , 2 shown.

[0025] A high-hardness and corrosion-resistant 7000-series aluminum alloy is manufactured by the following method.

[0026] According to the preparation of 45kg alloy.

[0027] First melt 32.79kg A00 grade pure Al (main components: 99.79% Al, 0.14% Fe, 0.04% Si, all contents are in mass percentage, the same below) and then add 1.75kg 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%), 1.09kgAl-Sr (89.86% Al, 9.89% Sr, 0.15% Fe, 0.10% Si) master alloy (the loss of Sr rate is about 75%), 1.80kg Al-Zr master alloy (95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (the loss rate of Zr is about 8%), 2.43kg Al-Sc master alloy ( 98% Al, 2% Sc) (the loss rate of Sc is about 5%), 4.08kg pure Zn (the loss rate of Zn is about 8%) and 1.06kg pure Mg (the loss rate of Mg is about 20%), so Said master alloy can be directly ordered from the market, and can also be prepared by conventional methods. After all mas...

Embodiment 2

[0031] A high-hardness and corrosion-resistant 7000-series aluminum alloy can be manufactured according to the following steps.

[0032] According to the preparation of 45kg alloy.

[0033] First melt 36.03kg of A00 grade pure Al (composition: 99.79Al, 0.14Fe, 0.04Si) and then add 1.52kg of Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si) master alloy (Cu The loss rate is about 6.25%), 0.43kg Al-Sr (89.86% Al, 9.89% Sr, 0.15% Fe, 0.10% Si) master alloy (the loss rate of Sr is about 75%), 1.76kg Al-Zr master alloy ( 95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (the loss rate of Zr is about 8%), 0.36kg Al-Sc master alloy (98% Al, 2% Sc) (the loss rate of Sc is about 5%), 3.89kg pure Zn (the loss rate of Zn is about 8%), 1.01kg pure Mg (the loss rate of Mg is about 20%), described master alloy can directly order from city, also can adopt conventional method For preparation, after all the intermediate alloys and metals are melted in pure aluminum, hexachloroethane is added for refining ...

Embodiment 3

[0037] A high-hardness and corrosion-resistant 7000-series aluminum alloy can be manufactured according to the following steps.

[0038] According to the preparation of 45kg alloy.

[0039] First melt 34.197kg A00 grade pure Al (composition: 99.79Al, 0.14Fe, 0.04Si) and then add 1.638kg Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si) master alloy (Cu The loss rate is about 6.25%), 0.766kg Al-Sr (89.86% Al, 9.89% Sr, 0.15% Fe, 0.10% Si) master alloy (the loss rate of Sr is about 75%), 1.785kg Al-Zr master alloy (95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (the loss rate of Zr is about 8%), 1.587kg Al-Sc master alloy (98% Al, 2% Sc) (the loss rate of Sc is about 5%), 3.986kg pure Zn (the loss rate of Zn is about 8%), 1.041kg pure Mg (the loss rate of Mg is about 20%). Preparation method: After all the intermediate alloys and metals are melted in pure aluminum, hexachloroethane is added for refining (90g added) for degassing, and after standing for 5-10 minutes, the slag is removed a...

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Abstract

The invention relates to high-hardness corrosion resistant 7000 series aluminum alloy and a production method thereof. The high hardness corrosion resistant 7000 series aluminum alloy is characterized by mainly comprising Al, Zn, Mg, Cu, Zr, Sr and Sc, wherein the mass percentage of Zn is 7.95-8.34%, Mg is 1.80-1.89%, Cu is 1.59-1.83%, Zr is 0.148-0.151%, Sr is 0.0237-0.599%, Sc is 0.015-0.103%, and the balance is aluminum and a trace amount of impurity elements. The production method of the aluminum alloy comprises the following steps of melting pure Al, sequentially adding Al-Cu master alloy, Al-Sr master alloy, Al-Zr master alloy, Al-Sc master alloy, pure Zn and pure Mg, adding hexachloroethane for refining after melting of the above metal, standing and preserving heat for 5-10 minutes and then casting ingots; and then annealing, forging and carrying out post treatment of solution and aging treatment. The hardness of the alloy can reach up to 210.1-212.2HV, the surfaces thereof only have slight pitting corrosion and stay in PA level by performing corrosion according to the national standard GB / T 22639-2008 (Test method of exfoliation corrosion for wrought aluminium and aluminium alloys).

Description

technical field [0001] The present invention relates to an aluminum alloy and a preparation method thereof, in particular to a 7000 series aluminum alloy with excellent performance improvement and a preparation method thereof, in particular to a high-hardness and corrosion-resistant 7000 series aluminum alloy added with trace alloy elements and its preparation method. Background technique [0002] As we all know, 7000 series (Al-Zn-Mg-Cu series) aluminum alloys are key structural materials in the fields of modern aerospace, weaponry and other fields. Among them, 7055 (the basic composition is Al-7.6~8.4Zn-1.8~2.3Mg-2.0~2.6Cu-0.08~0.25Zr) and 7085 (the basic composition is Al-7.0~8.0Zn-1.2~1.8Mg-1.3~2.0Cu -0.08~0.15Zr) aluminum alloys have attracted much attention. The former is a new generation of high-hardness, high-strength aluminum alloy, but its corrosion resistance is poor, and its hardenability is low, which limits its application in thick plates (plate thickness is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
Inventor 许晓静吴桂潮王彬王宏宇房士义韦宝存赵梓皓成城罗勇程晓农
Owner JIANGSU UNIV
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