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Production process for improving intergranular corrosion resistance of 6 series aluminum alloys

A production process and intergranular corrosion technology, which is applied in the field of production technology to improve the intergranular corrosion resistance of 6 series aluminum alloys, can solve the problems of increased sensitivity to intergranular corrosion, save heat treatment time, improve intergranular corrosion performance, The effect of expanding the scope of application

Inactive Publication Date: 2020-04-03
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a production process for improving the intergranular corrosion resistance of the 6-series aluminum alloy in order to solve the problem that the addition of Cu to enhance the mechanical properties of the above-mentioned 6-series aluminum alloy will lead to an increase in intergranular corrosion sensitivity

Method used

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  • Production process for improving intergranular corrosion resistance of 6 series aluminum alloys

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Embodiment 1

[0027] A production process for improving the intergranular corrosion resistance of 6-series aluminum alloys, comprising the following steps:

[0028] A. Calculate the amount of each aluminum alloy raw material and prepare the aluminum alloy raw material according to the ratio. The mass percentage ratio of each element of the 6 series aluminum alloy raw material is as follows:

[0029] element Si Fe Cu mn Mg Cr Ti Impurities Al content 0.5 0.35 0.3 0.5 0.4 0.3 0.1 0.1 margin

[0030] Add the prepared aluminum alloy raw materials into the melting furnace and mix them evenly, then melt them into liquid aluminum alloys, and melt and cast the liquid aluminum alloys into aluminum alloy ingots. During the aluminum alloy melting process, all aluminum alloy raw materials are preheated and removed at 200°C Water vapor; the order of adding aluminum alloy raw materials is: first add pure aluminum, add Al-35% Si intermediate alloy when the pure ...

Embodiment 2

[0038] The difference between Example 2 and Example 1 is that in step F, the stretched aluminum alloy profile is subjected to a double-stage aging heat treatment, wherein the primary aging system is 175°C×9h, and the profile is heated with the furnace at a heating rate of 200°C / h ;The secondary aging system is 200℃×4h, the heating time from the primary aging to the secondary aging shall not exceed 15min, and air-cool to room temperature after aging.

Embodiment 3

[0040] The difference between Example 3 and Example 1 is that in step F, the stretched aluminum alloy profile is subjected to a double-stage aging heat treatment, wherein the primary aging system is 185°C×7h, and the profile is heated with the furnace at a heating rate of 200°C / h ;The secondary aging system is 200℃×4h, the heating time from the primary aging to the secondary aging shall not exceed 15min, and air-cool to room temperature after aging.

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Abstract

The invention belongs to the technical field of metal heat treatment, and relates to a production process for improving the intergranular corrosion resistance of 6 series aluminum alloys. The 6-seriesaluminum alloys are prepared from the raw materials: 0.5% to 0.9% of Si, less than or equal to 0.35% of Fe, less than or equal to 0.30% of Cu, less than or equal to 0.50% of Mn, 0.4% to 0.7% of Mg, less than or equal to 0.30% of Cr, 0.1% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al; a preparation method includes the steps of ingredient melting and casting, homogenization, extrusion, solution quenching, stretching, two-stage aging and detection; and the two-stage aging system is (175-185 DEG C)*(7-9h)+200 DEG C*(3-5h), and the heating time from the first-stage aging to the second-stage aging does not exceed 15min. The two-stage aging is a best aging mode, and the tensile strength and the intergranular corrosion resistance are the best match.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and relates to a production process for improving the intergranular corrosion resistance of 6-series aluminum alloys. Background technique [0002] The 6-series aluminum alloy mainly includes two series of Al-Mg-Si and Al-Mg-Si-Cu, and the 6-series aluminum alloy is a typical wrought aluminum alloy that can be strengthened by heat treatment. 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. Although 6-series aluminum alloys have good corrosion resistance, improper heat treatment methods, addition of Cu, and the mass ratio of Mg to Si all affect the intergranular corrosion tendency of the alloy, which limits the further application of the alloy. Compared with Al-Mg-Si aluminum alloys, the addition of Cu can...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/02C22C21/00C22F1/043C22F1/04B21C37/00B21C23/04B21C29/00B21C1/00
CPCB21C1/00B21C23/04B21C29/003B21C37/00C22C1/026C22C1/03C22C1/06C22C21/00C22C21/02C22F1/002C22F1/04C22F1/043
Inventor 孙亮祝哮刘兆伟杨路
Owner CHINA ZHONGWANG
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