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Method for enhancing anti-corrosion property of 700 MPa strength level high-alloying 7000 series aluminum alloy

A technology of alloying and aluminum alloy, which is applied in the field of aluminum alloy technology, can solve problems such as the difficulty in balancing strength and corrosion resistance, and the unsatisfactory comprehensive performance of high-alloyed 7000 series aluminum alloys, etc., to achieve good engineering value and application prospects, equipment The effect of low requirements and simple process

Active Publication Date: 2014-08-27
靖江新源电力器械有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to invent a method for improving the corrosion resistance of high-alloyed 7000-series aluminum alloys with a strength level of 700 MPa to solve the problems that the comprehensive performance of high-alloyed 7000-series aluminum alloys is not ideal enough, and the strength and corrosion resistance are difficult to balance.

Method used

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  • Method for enhancing anti-corrosion property of 700 MPa strength level high-alloying 7000 series aluminum alloy
  • Method for enhancing anti-corrosion property of 700 MPa strength level high-alloying 7000 series aluminum alloy

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Effect test

Embodiment 1

[0019] The high-alloyed 7000 series aluminum alloy extruded material with the measured mass fraction of Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr is subjected to 250±5℃×24h+300±5℃×6h+350 Pre-recovery annealing at ±5°C×6h+400±5°C×6h, 450±5°C×2h+460±5°C×2h+470±5°C×2h after heat preservation, room temperature water quenching and solution treatment, 2% plastic deformation Pre-deformation, 121±5℃×24h aging treatment. Its hardness, electrical conductivity, strength, intergranular corrosion, and exfoliation corrosion properties were measured, and compared with the alloy without pre-recovery annealing and pre-deformation.

[0020] The experimental results are as follows:

[0021]

Embodiment 2

[0023] The high-alloyed 7000 series aluminum alloy extruded material with the measured mass fraction of Al-11.54Zn-3.51Mg-2.26Cu- 0.24Zr-0.0025Sr was subjected to 250±5℃×24h+300±5℃×6h+350 Pre-recovery annealing at ±5°C×6h+400±5°C×6h, 450±5°C×2h+460±5°C×2h+470±5°C×2h after heat preservation, room temperature water quenching and solution treatment, 2% plastic deformation Pre-deformation, 121±5℃×24h aging treatment. Its hardness, electrical conductivity, strength, intergranular corrosion, and exfoliation corrosion properties were measured, and compared with the alloy without pre-recovery annealing and pre-deformation.

[0024] The experimental results are as follows:

[0025]

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Abstract

The invention relates to a method for enhancing the anti-corrosion property of a 700 MPa strength level high-alloying 7000 series aluminum alloy. The method is characterized by comprising the following steps: previous recovery (250 DEG C*24h+300 DEG C*6h+350 DEG C*6h+400 DEG C*6h), solution treatment (450 DEG C*2h+460 DEG C*2h+470 DEG C*2h water quenching at room temperature after heat preservation), pre-deformation (2% plastic deformation) and aging (121 DEG C*24h). The method disclosed by the invention outstandingly enhances the intergranular corrosion resistant property and exfoliation corrosion resistant property of an alloy under the condition without lowering the strength of the alloy.

Description

technical field [0001] The present invention relates to an aluminum alloy process technology, especially a process method for improving the comprehensive performance of high-alloyed 7000-series aluminum alloys, specifically a method for improving the corrosion resistance of 700MPa high-alloyed 7000-series aluminum alloys . Background technique [0002] The highly alloyed 7000 series aluminum alloy has a high degree of alloying, so it is difficult to guarantee the corrosion resistance. Pre-regression treatment can recover the alloy structure without obvious growth of alloy grains, reduce the recrystallization driving force of the alloy during solid solution, and facilitate the retention of small-angle grain boundaries after alloy solid solution, which can significantly Improve the corrosion resistance of the alloy. Pre-deformation can introduce dislocations, provide a large number of precipitation sites for aging precipitation phases, make the precipitation of aging precipi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 许晓静徐驰王宏宇邓平安吴瑶张香丽范亚洲蒋伟孙良省
Owner 靖江新源电力器械有限公司
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