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Corrosion-resistant high-strength aluminum alloy and preparation method thereof

An aluminum alloy and corrosion-resistant technology, which is applied in the field of corrosion-resistant high-strength aluminum alloy and its preparation, can solve the problems of insufficient tensile strength and corrosion resistance, difficulty in meeting high-quality requirements, etc., achieve excellent anti-corrosion performance, and improve resistance to exfoliation corrosion , the effect of reducing pollution

Active Publication Date: 2021-10-22
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of high-strength aluminum alloys in the prior art, which have insufficient tensile strength and corrosion resistance, and are difficult to meet the high-quality requirements under the development of the existing technology industry, and propose a corrosion-resistant high-strength aluminum alloy. Alloy and its preparation method

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  • Corrosion-resistant high-strength aluminum alloy and preparation method thereof

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Embodiment 1

[0026] A corrosion-resistant high-strength aluminum alloy, comprising the following components in mass percentage: Mg0.65%, Fe 0.08%, Cr0.12%, Cu 1.35%, Zn 5.42%, Ti 0.08-%, Si 0.35%, Ni 0.03% , Sr 0.06%, Zr 0.05%, rare earth element 0.03%, impurity ≤ 0.12%, the balance is Al, and the rare earth element is composed of Sc and Yb mixed in equal proportions.

[0027] The preparation method of the above-mentioned corrosion-resistant high-strength aluminum alloy comprises the following steps:

[0028] S1. Weigh the corresponding proportion of raw materials, and add the prepared raw materials into the melting furnace for melting until a uniform melt is obtained. The temperature during melting is 720 °C and the melting time is 3.5 hours;

[0029] S2. Refining the melt obtained in S1 at a refining temperature of 800°C, introducing a mixed gas of nitrogen and argon, and adding a refining agent. After refining, perform slag removal and degassing treatment, and then smelt and cast it int...

Embodiment 2

[0034] A corrosion-resistant high-strength aluminum alloy, including the following components in mass percentage: Mg0.80%, Fe 0.10%, Cr0.13%, Cu 1.50%, Zn 5.85%, Ti 0.09%, Si0.45%, Ni 0.04% , Sr 0.08%, Zr 0.06%, rare earth element 0.05%, impurity ≤ 0.13%, the balance is Al, and the rare earth element is composed of Sc and Yb mixed in a ratio of 1:2.

[0035] A method for preparing a corrosion-resistant high-strength aluminum alloy, comprising the following steps:

[0036] S1. Weigh the corresponding proportion of raw materials, and add the prepared raw materials into the melting furnace for melting until a uniform melt is obtained. The temperature during melting is 730°C and the melting time is 3.0h;

[0037] S2. Refining the melt obtained in S1 at a refining temperature of 820°C, introducing a mixed gas of nitrogen and argon, and adding a refining agent. After refining, perform slag removal and degassing, and then smelt and cast it into an aluminum alloy Ingot;

[0038] S3....

Embodiment 3

[0042]A corrosion-resistant high-strength aluminum alloy, including the following components in mass percentage: Mg1.65%, Fe0.15%, Cr0.16%, Cu2.25%, Zn7.12%, Ti0.13%, Si0.75%, Ni0.05 %, Sr 0.10%, Zr 0.08%, rare earth elements 0.03-0.08%, impurities ≤ 0.14%, the balance is Al, and the rare earth elements are composed of Sc and La mixed in equal proportions.

[0043] A method for preparing a corrosion-resistant high-strength aluminum alloy, comprising the following steps:

[0044] S1. Weigh the corresponding proportion of raw materials, and add the prepared raw materials into the melting furnace for melting until a uniform melt is obtained. The temperature during melting is 740°C and the melting time is 2.5 hours;

[0045] S2. Refining the melt obtained in S1 at a refining temperature of 840°C, introducing a mixed gas of nitrogen and argon, and adding a refining agent. After refining, perform slag removal and degassing, and then smelt and cast it into an aluminum alloy Ingot; ...

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Abstract

The invention discloses a corrosion-resistant high-strength aluminum alloy and a preparation method thereof, and relates to the technical field of mechanical engineering materials. Aiming at the problems that an existing high-strength aluminum alloy is insufficient in tensile strength and corrosion resistance and cannot meet the high-quality requirement under existing scientific and technological industrial development easily, the invention provides the following scheme. The corrosion-resistant high-strength aluminum alloy comprises the following components: Mg, Fe, Cr, Cu, Zn, Ti, Si, Ni, Sr, Zr, rare earth elements, impurities and Al. The raw materials are mixed according to a proper proportion, so that eutectic is spheroidized and homogenized in the machining process, the segregation phenomenon of the eutectic in an alloy structure is improved, grains are refined, and recrystallization of a matrix is inhibited. Therefore, the comprehensive performance of the alloy is improved, and the corrosion resistance of the high-strength aluminum alloy is greatly improved. In the preparation process, grain refinement can be further promoted, and the alloy performance is improved. The process steps are easy to operate, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering materials, in particular to a corrosion-resistant high-strength aluminum alloy and a preparation method thereof. Background technique [0002] As one of the important structural materials, aluminum alloy is widely used in automobile, construction and other industries and daily life due to a series of advantages such as small specific gravity and high strength. High-strength aluminum alloys generally refer to super-hard high-strength aluminum alloys based on the series of aluminum-zinc-magnesium-copper-aluminum alloys. Pure aluminum has low density and excellent plasticity, but its strength is not high. As an aerospace application, the choice of low-density materials is an important way to increase payload, and aluminum is a good choice. However, the improvement of its strength requires alloying. After decades of research and accumulation, the ultra-hard high-strength aluminum all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053C21D1/18C22B9/05C23C22/78C23C22/73C23F17/00
CPCC22C21/10C22C1/026C22F1/053C22F1/002C22B9/05C23C22/78C23C22/73C23F17/00
Inventor 李雪伍石甜李本张传伟钟斌吕源李晨姜小娜王红星何美玲
Owner XIAN UNIV OF SCI & TECH
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