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Preparation method of lanthanum-containing anti-corrosion aluminum alloy material

A corrosion-resistant aluminum alloy and aluminum alloy technology, applied in the field of metal material manufacturing, can solve the problem of lack of economical and effective solutions for corrosion-resistant aluminum alloy profiles, and achieve the effects of excellent seawater corrosion resistance, low equipment requirements, and safe and simple operation.

Active Publication Date: 2018-06-29
高安市璐克斯机械有限公司
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AI Technical Summary

Problems solved by technology

[0008] Therefore, in summary, there is still a lack of an economical and effective solution in the preparation and molding technology of corrosion-resistant aluminum alloy profiles.
Moreover, the effect of rare earth La as an alloying element on the corrosion resistance of Al-Si-Cu cast aluminum alloys has not been reported, so it has great research value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) According to the proportion of silicon 4.5wt.%, copper 0.5wt.%, lanthanum 0.4wt.%, and the rest is aluminum, take industrial pure aluminum ingots, Al-10Si alloy, Al-10Cu alloy and Al-10La alloy respectively into Vacuum drying oven, the drying temperature is 70°C, and the drying time is 60 minutes.

[0028] (2) Place a corundum crucible in a tube furnace protected by a high-purity argon atmosphere, and add pure aluminum ingots. The melting temperature is 740°C and the temperature is kept for 7 minutes.

[0029] (3) Raise the furnace temperature in step (2) to 835°C, and then divide the pre-dried Al-10Si alloy obtained in step (1) into several equal parts and add them to the heated melt, adding Al each time The amount of -10Si alloy is 2.5wt.% of the total mass of the melt. After each addition, a high-temperature-resistant alloy steel double-blade stirrer was used to stir for 1 minute at a rate of 30 rpm, and after all was added, it was left to stand for 6 minutes. ...

Embodiment 2

[0037] (1) According to the proportion of silicon 5.0wt.%, copper 1.0wt.%, lanthanum 0.5wt.%, and the rest is aluminum, take industrial pure aluminum ingots, Al-10Si alloy, Al-10Cu alloy and Al-10La alloy respectively into Vacuum drying oven, the drying temperature is 70°C, and the drying time is 60 minutes.

[0038] (2) Place a corundum crucible in a tube furnace protected by a high-purity argon atmosphere, and add pure aluminum ingots. The melting temperature is 745°C and the temperature is kept for 8 minutes.

[0039] (3) Raise the furnace temperature in step (2) to 840°C, and then divide the pre-dried Al-10Si alloy obtained in step (1) into several equal parts and add them to the heated melt, adding Al each time The amount of -10Si alloy is 3.0wt.% of the total mass of the melt. After each addition, a high-temperature-resistant alloy steel double-blade stirrer was used to stir for 1 minute at a rate of 30 rpm, and after all was added, it was left to stand for 6 minutes. ...

Embodiment 3

[0047] (1) According to the proportion of silicon 5.5wt.%, copper 1.5wt.%, lanthanum 0.6wt.%, and the rest is aluminum, take industrial pure aluminum ingots, Al-10Si alloy, Al-10Cu alloy and Al-10La alloy respectively into Vacuum drying oven, the drying temperature is 70°C, and the drying time is 60 minutes.

[0048] (2) Place a corundum crucible in a tube furnace protected by a high-purity argon atmosphere, and add a certain quality of pure aluminum ingots. The melting temperature is 750°C and the temperature is kept for 10 minutes.

[0049] (3) Raise the furnace temperature in step (2) to 850°C, then divide the pre-dried Al-10Si alloy obtained in step (1) into several equal parts and add them to the heated melt, adding Al each time The amount of -10Si alloy is 3.5wt.% of the total mass of the melt. After each addition, a high-temperature-resistant alloy steel double-blade stirrer was used to stir for 1 minute at a rate of 30 rpm. After all the addition, it was left to stand...

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Abstract

The invention relates to a preparation method of a lanthanum-containing anti-corrosion aluminum alloy material. The lanthanum-containing anti-corrosion aluminum alloy material is prepared from the following ingredients in percentage by mass: 4.5 to 5.5 percent of silicon, 0.5 to 1.5 percent of copper, 0.4 to 0.6 percent of lanthanum, and the balance of aluminum and inevitable impurities. The formula of the alloy is optimized through controlling the contents of different elements in the alloy, especially the content of iron. After the rare earth lanthanum is refined, galvanic corrosion reactionbetween an intermetallic compound and an aluminum substrate in the alloy is weakened, and the inherent excellent property of the alloy is not influenced. Secondary solution treatment and low temperature aging treatment are carried out on the alloy subsequently, and inactive elements such as Cu and Fe are fully dissolved, so that a galvanic corrosion influence between an aluminum base and other inactive alloy elements is further reduced. The corrosion resistance of the alloy material provided by the invention is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a method for preparing a corrosion-resistant aluminum alloy. Background technique [0002] Al-Si-Cu alloy has good casting performance and high air tightness, good machinability and weldability, and has high strength after heat treatment strengthening. Due to Al in Al-Si-Cu alloy 2 The corrosion potential of Cu and Al-Fe-Si intermetallic compound in seawater is higher than that of α-Al matrix, so it will lead to localized corrosion of Al-Si-Cu alloy in seawater. The occurrence of localized corrosion greatly limits the application of Al-Si-Cu alloys in marine environments. [0003] So far, the refining methods of Al-Si-Cu alloy mainly include: adding rare earth or alkaline earth elements, electromagnetic stirring ultrasonic treatment. However, among the above methods, the rare earth refining method has simple technical operation, low equipment r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/02C22F1/043
Inventor 闫洪喻保标吴庆捷
Owner 高安市璐克斯机械有限公司
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