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Two-stage aging technology of exfoliation corrosion resistant erbium-containing Al-Zn-Mg-Cu alloy

A two-stage aging and exfoliation corrosion technology, which is applied in the field of non-ferrous metal materials, can solve the problems of low toughness and poor corrosion resistance, and achieve the effect of high strength and superior exfoliation corrosion resistance

Active Publication Date: 2014-07-02
BEIJING UNIV OF TECH
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Problems solved by technology

The peak aging alloy has the characteristics of high strength, low toughness and poor corrosion resistance, which has great limitations in practical application

Method used

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  • Two-stage aging technology of exfoliation corrosion resistant erbium-containing Al-Zn-Mg-Cu alloy
  • Two-stage aging technology of exfoliation corrosion resistant erbium-containing Al-Zn-Mg-Cu alloy
  • Two-stage aging technology of exfoliation corrosion resistant erbium-containing Al-Zn-Mg-Cu alloy

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Embodiment

[0015] After the alloy is solution quenched, it is kept at 120°C for 4h; then the alloy is kept at 150°C, 160°C and 170°C for 1-60h respectively. figure 1 For the corresponding aging hardness curve, Table 1 shows the exfoliation corrosion rating of the alloy after double-stage aging.

[0016] Table 1 Exfoliation corrosion rating of the alloy after the second aging

[0017]

[0018] Compared figure 1 From Table 1, it can be found that with the prolongation of the secondary aging time and the increase of temperature, the hardness of the alloy gradually decreases, and the higher the temperature, the faster the decrease; while the exfoliation corrosion resistance of the alloy is significantly improved, and gradually becomes weaker in the early aging period. Well, after a certain point it starts to get worse. comprehensive figure 1 And Table 1, the alloy in the second stage of aging is 160 ℃ for a certain period of time, the exfoliation corrosion resistance is better than oth...

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Abstract

A two-stage aging technology of exfoliation corrosion resistant erbium-containing Al-Zn-Mg-Cu alloy belongs to the technical field of non-ferrous metals. The invention aims at providing the two-stage aging technology suitable for an erbium-containing Al-Zn-Mg-Cu alloy extrusion sheet material so as to solve the problem of poor exfoliation corrosion resistance. The two-stage aging technology comprises the following steps: carrying out solution treatment on the alloy at the temperature of 470 DEG C for 2 hours, carrying out water cooling and quenching; then carrying out aging thermal treatment at the temperature of 120 DEG C for 4 hours and at the temperature of 150-170 DEG C for 1-60 hours, and preferably selecting 120DEG C / 4h and 160 DEG C / (8-16) / h as a two-stage aging system. The two-stage aging technology can be used for ensuring that the alloy has relatively high strength and good exfoliation corrosion resistance.

Description

technical field [0001] The invention relates to a two-stage aging process for an erbium-containing Al-Zn-Mg-Cu alloy resistant to exfoliation corrosion, and belongs to the technical field of nonferrous metal materials. Background technique [0002] The literature survey shows that aluminum alloys are widely used in aerospace, transportation, light industry and communication industries due to their low density, high specific strength, good toughness, easy forming, and low price. Pay attention to the research, development and popularization and application of aluminum alloy materials. Among them, Al-Zn-Mg-Cu (7xxx series) alloy is a high-strength aluminum alloy that can be strengthened by heat treatment. It is widely used in aerospace and military industries as a lightweight structural material, but it has low toughness and relatively poor corrosion resistance. Inferior disadvantages limit its scope of use. How to ensure that Al-Zn-Mg-Cu alloy has high strength and good toug...

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Application Information

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IPC IPC(8): C22F1/053
Inventor 黄晖孙中国聂祚仁高坤元文胜平王月琦王为
Owner BEIJING UNIV OF TECH
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