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Two-stage aging method for improving intercrystalline corrosion resistance of 6000 series of aluminium alloy

An intergranular corrosion and double-stage aging technology, applied in the field of aluminum alloy heat treatment, can solve the problems of cumbersome process steps and long treatment period, and achieve the effect of simple process steps and short treatment period

Inactive Publication Date: 2014-05-07
CHANGZHOU UNIV
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  • Application Information

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Problems solved by technology

[0005] The invention overcomes the shortcomings of the prior art that the three-stage aging process can improve the intergranular corrosion ability but has cumbersome process steps and a long treatment period, and provides a two-stage aging method for improving the intergranular corrosion resistance of 6000 series aluminum alloys

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  • Two-stage aging method for improving intercrystalline corrosion resistance of 6000 series of aluminium alloy
  • Two-stage aging method for improving intercrystalline corrosion resistance of 6000 series of aluminium alloy

Examples

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Embodiment 1

[0022] A two-stage aging treatment method for improving the intergranular corrosion resistance of aluminum alloys. The process steps are: the experimental material is 6061 aluminum alloy, and after solution treatment and water quenching at 530°C / 3h, first perform high-temperature pre-aging at 200°C / 1h. At this time the hardness is 108HV 0.5 , equivalent to 86% of the peak hardness. Afterwards, low-temperature re-aging at 155°C / 120h was carried out to the peak aging state. At this time, the tensile strength and yield strength of the alloy are 351MPa and 326MPa, respectively. The intergranular corrosion sensitivity test shows that the surface of the sample does not have the characteristics of preferential expansion of corrosion cracks along the grain boundaries, but is uniform and smooth, that is, uniform corrosion, such as figure 2 shown.

Embodiment 2

[0024] A two-stage aging treatment method for improving the intergranular corrosion resistance of aluminum alloys. The process steps are: the experimental material is 6061 aluminum alloy, after solution treatment and water quenching at 560°C / 1h, first perform high temperature pre-aging at 180°C / 6h, At this time the hardness value is 117HV 0.5 , equivalent to 94% of the peak hardness. Afterwards, low-temperature re-aging at 175°C / 16h was carried out to the peak aging state. At this time, the tensile strength and yield strength of the alloy were 362MPa and 332MPa, respectively, and the corrosion behavior was uniform corrosion.

Embodiment 3

[0026] A two-stage aging treatment method for improving the intergranular corrosion resistance of aluminum alloys. The process steps are: the experimental material is 6061 aluminum alloy, and after solution treatment and water quenching at 540°C / 2h, first perform high-temperature pre-aging at 190°C / 2h. At this time the hardness is 105HV 0.5 , equivalent to 84% of the peak hardness. Afterwards, low-temperature re-aging at 160°C / 72h was carried out to the peak aging state. At this time, the tensile strength and yield strength of the alloy were 353MPa and 328MPa, respectively, and the corrosion behavior was uniform corrosion.

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Abstract

The technical scheme adopted by the invention is a two-stage aging method for improving the intercrystalline corrosion resistance of 6000 series of aluminium alloy. The two-stage aging method comprises the following steps: after carrying out solid-dissolving treatment and quenching on the 6000 series of aluminium alloy, respectively carrying out (1) high-temperature preaging and (2) low-temperature reaging. The two-stage aging method has the beneficial effects that the purposes of improving the intercrystalline corrosion resistance of 6000 series of Al-Mg-Si-Cu aluminium alloy and maintaining the strength are realized; simultaneously, the method is simple in process step and short in treating period and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of heat treatment of aluminum alloys, in particular to a double-stage aging method for improving the intergranular corrosion resistance of 6000 series aluminum alloys. Background technique [0002] The 6000 series aluminum alloy mainly includes two series of Al-Mg-Si and Al-Mg-Si-Cu. This series of aluminum alloy has the characteristics of medium strength, low density, good formability and weldability, so it has been widely used in automobile manufacturing, aerospace, rail transit and construction industries. Compared with Al-Mg-Si aluminum alloys, the addition of Cu can improve the mechanical properties of Al-Mg-Si-Cu aluminum alloys, but at the same time lead to a greatly increased susceptibility to intergranular corrosion, especially in the T6 peak aging state. More serious, thus limiting the scope of application of the alloy. [0003] In order to solve the problem of severe susceptibility to intergranular corros...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 李海苗芬芬王芝秀方必军宋仁国
Owner CHANGZHOU UNIV
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