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Preparation method of salt solution corrosion resistant nanoparticle reinforced Mg-Al alloy

A nanoparticle and alloy technology is applied in the preparation of salt solution corrosion-resistant nanoparticle-enhanced Mg-Al alloys, and in the field of neutral salt-water corrosion-resistant nanoparticle-enhanced Mg-Al alloys, which can solve the limitation of strategic resource rare earth elements, reduce Alloy mechanical properties, galvanic corrosion and other issues, to achieve the effect of improving alloy mechanical properties, inhibiting corrosion, and improving corrosion performance

Inactive Publication Date: 2022-03-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in the alloying treatment. For example, although the addition of Ca can improve the corrosion resistance of the AZ91 alloy, it will reduce the mechanical properties of the alloy at room temperature; the intermetallic compounds formed after the addition of some elements will cause more serious galvanic corrosion. , such as Mg 3 Bi 2 and Mg 3 Sb 2 etc.; for rare earth elements, although they are beneficial to the improvement of the corrosion resistance of AZ91 alloy, their scarcity and strategic resources make the application of rare earth elements still limited

Method used

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  • Preparation method of salt solution corrosion resistant nanoparticle reinforced Mg-Al alloy
  • Preparation method of salt solution corrosion resistant nanoparticle reinforced Mg-Al alloy
  • Preparation method of salt solution corrosion resistant nanoparticle reinforced Mg-Al alloy

Examples

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Embodiment 1

[0044] This embodiment provides a method for preparing a salt solution corrosion-resistant nanoparticle-reinforced Mg-Al alloy. The nanoparticle content is 0.5% of the volume fraction of the base alloy. The specific steps are as follows:

[0045] S1. Divide the TiCN nano-ceramic particles with a content of 0.5% of the volume fraction of the base alloy into 2 parts and wrap them with aluminum foil. The nano-particles are in the smallest measurement unit of 0.25vol.%, to obtain granular aluminum bags and keep them warm to 300°C for use;

[0046] S2. The raw materials are 99.9-99.99% pure magnesium, 99.9-99.99% pure aluminum and 99.9-99.99% pure zinc according to the proportion of AZ91 alloy components, aluminum 9%, zinc 9%, and the balance is magnesium, after mixing Put it in a smelting furnace, heat it to 740°C, keep it warm for 30 minutes after the raw materials are completely melted, stir to make the alloy melt mix evenly, after the heat preservation operation, remove the scum...

Embodiment 2

[0050] This example provides a method for preparing a salt solution corrosion-resistant nanoparticle-reinforced Mg-Al alloy. The preparation method is similar to Example 1, except that the nanoparticle content is 1.0% of the volume fraction of the base alloy.

Embodiment 3

[0052] This example provides a method for preparing a salt solution corrosion-resistant nanoparticle-reinforced Mg-Al alloy. The preparation method is similar to Example 1, except that the nanoparticle content is 2.0% of the volume fraction of the base alloy.

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Abstract

The invention discloses a preparation method of a nano-particle reinforced Mg-Al alloy resistant to salt solution corrosion. According to the method, nano-particles are introduced into alloy melt by adding the nano-particles in batches under the assistance of a variable-frequency high-energy ultrasonic treatment method, and cooling forming is performed by adopting a mold with a relatively low cooling speed. Due to the fact that the cooling speed in the solidification process is low, the solidification speed of the front edge of a solid-liquid interface is not enough to swallow nano-particles dispersed in melt, the nano-particles can be pushed to be on the surface of primary alpha-Mg and be enriched at the phase interface of alpha-Mg and eutectic beta-Mg17Al12, a nano-particle layer is formed, further permeation of Cl <-> ions at the grain boundary is hindered, and alloy corrosion is slowed down. Besides, the nano-particle layer can hinder diffusion of Al melt, so that a large number of Al melt atoms are subjected to supersaturated solid solution in an alpha-Mg matrix, the potential of the alpha-Mg matrix is improved, the potential difference between the alpha-Mg matrix and beta-Mg17Al12 is reduced, the galvanic corrosion speed between alpha-Mg and beta-Mg17Al12 is greatly reduced, and therefore the corrosion resistance of the Mg-Al alloy in the neutral saline water environment is enhanced.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant Mg-Al alloys, and in particular relates to a preparation method of a salt solution corrosion-resistant nanoparticle-reinforced Mg-Al alloy, which relates to a nano-particle-reinforced Mg-Al alloy resistant to neutral salt solution corrosion method. Background technique [0002] Mg-Al alloys, especially AZ91 alloys, are widely used in the fields of aerospace and automobile lightweight due to their advantages of light weight, good castability, high specific strength and specific stiffness. However, the chemical activity of magnesium is high, and the standard electrode potential is ~2.34V, which is the lowest among structural metal materials, so the corrosion resistance of Mg and its alloys is extremely poor. For the AZ91 alloy, its microstructure is mainly composed of α-Mg phase and a large number of divorced eutectic structures β-Mg precipitated along the grain boundaries. 17 Al 12 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C23/02C22C32/00
CPCC22C1/1036C22C23/02C22C32/0089C22C1/1047
Inventor 王奎李浩楠徐高鹏蒋海燕王渠东丁文江
Owner SHANGHAI JIAO TONG UNIV