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Preparation method for corrosion-resistant die-casting aluminum alloy containing neodymium and cerium

A technology of corrosion-resistant aluminum alloy and cast aluminum alloy, applied in the field of metal material manufacturing, can solve the problem of lack of economical and effective solutions for corrosion-resistant die-casting aluminum alloy materials, achieve excellent seawater corrosion resistance, improve solid solubility, and reduce electricity. Effects of Coupled Corrosion Effects

Active Publication Date: 2018-05-18
张庆成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, in summary, there is still a lack of an economical and effective solution in the preparation and molding technology of corrosion-resistant die-casting aluminum alloy materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) According to the proportion of magnesium 0.6wt.%, silicon 0.4wt.%, copper 0.5wt.%, neodymium 0.2wt.%, cerium 0.2wt.%, and the rest is aluminum, take industrial pure aluminum ingot and Al-10Mg alloy respectively , Al-10Si alloy, Al-10Cu alloy, Al-10Nd alloy and Al-10Ce alloy are placed in a vacuum drying oven, the drying temperature is 70 ° C, and the drying time is 60 minutes;

[0032] (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 700°C and the temperature is kept for 5 minutes.

[0033] (3) Raise the furnace temperature in step (2) to 820°C, then divide the pre-dried Al-10Mg alloy obtained in step (1) into several equal parts and add them to the heated melt, and then add The amount of Al-10Mg alloy is 0.3wt.% 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 o...

Embodiment 2

[0044] (1) According to the ratio of 0.9wt.% magnesium, 0.7wt.% silicon, 0.75wt.% copper, 0.3wt.% neodymium, 0.3wt.% cerium, and the rest are aluminum ratios, respectively take industrial pure aluminum ingots and Al-10Mg alloys , Al-10Si alloy, Al-10Cu alloy, Al-10Nd alloy and Al-10Ce alloy are placed in a vacuum drying oven, the drying temperature is 70 ° C, and the drying time is 60 minutes;

[0045] (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 710°C and the temperature is kept for 7 minutes.

[0046] (3) Raise the furnace temperature in step (2) to 820°C, then divide the pre-dried Al-10Mg alloy obtained in step (1) into several equal parts and add them to the heated melt, and then add The amount of Al-10Mg alloy is 0.45wt.% 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...

Embodiment 3

[0057] (1) According to the proportion of magnesium 1.2wt.%, silicon 1.0wt.%, copper 1.0wt.%, neodymium 0.4wt.%, cerium 0.4wt.%, and the rest are aluminum ratios, respectively take industrial pure aluminum ingots and Al-10Mg alloys , Al-10Si alloy, Al-10Cu alloy, Al-10Nd alloy and Al-10Ce alloy are placed in a vacuum drying oven, the drying temperature is 70 ° C, and the drying time is 60 minutes;

[0058] (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 720°C and the temperature is kept for 10 minutes.

[0059] (3) Raise the furnace temperature in step (2) to 830°C, then divide the pre-dried Al-10Mg alloy obtained in step (1) into several equal parts and add them to the heated melt, and then add The amount of Al-10Mg alloy is 0.6wt.% 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 ...

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Abstract

The invention discloses a preparation method for a corrosion-resistant die-casting aluminum alloy containing neodymium and cerium. The corrosion-resistant die-casting aluminum alloy comprises, by weight, 0.6-1.2% of magnesium, 0.4-1.0% of silicon, 0.5-1.0% of copper, 0.2-0.4% of neodymium, 0.2-0.4% of cerium and the balance aluminum and unavoidable impurities. The content of different elements inthe alloy is controlled to optimize the alloy formula. After rare earth neodymium and cerium are refined, a galvanic corrosion reaction between intermetallic compounds in the alloy and an aluminum matrix is weakened, and the intrinsic excellent properties of the alloy are not affected. An aluminum alloy material with the high surface finish degree and a compact structure can be obtained through die-casting forming, and the corrosion resistance of the alloy can be improved to a certain extent. The corrosion-resistant die-casting aluminum alloy is subjected to two-stage solution treatment and low-temperature aging treatment in the later period, thus inactive elements such as Cu and Fe are fully dissolved, and the galvanic corrosion influence between the aluminum matrix and other active alloyelements is further reduced accordingly. The corrosion resistance of the alloy material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a corrosion-resistant aluminum alloy. Background technique [0002] Al-Mg-Si-Cu alloy has good welding performance and is often used as a structural material. It has higher strength after heat treatment strengthening. Due to Al in Al-Mg-Si-Cu alloy 2 Cu, eutectic Si, Mg 2 The corrosion potential of Si and Al-Fe-Si intermetallic compounds in seawater is higher than that of α-Al matrix, so it will cause localized corrosion of Al-Mg-Si-Cu alloy in seawater. The occurrence of localized corrosion greatly limits the application of Al-Mg-Si-Cu alloys in marine environments. [0003] So far, the refining methods of Al-Mg-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 re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/08C22C1/03C22F1/047C22F1/04
CPCC22C1/026C22C1/03C22C21/00C22C21/08C22F1/002C22F1/04C22F1/047
Inventor 闫洪喻保标
Owner 张庆成
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