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A medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy and its preparation method

A technology of aluminum alloy and master alloy, applied in the field of aluminum alloy smelting and casting, which can solve the problems of low strength and hardness, reduced toughness, corrosion resistance and welding performance

Active Publication Date: 2021-02-19
福建祥鑫股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the strength and hardness of the existing 6xxx series aluminum alloys are low, and the toughness, corrosion resistance and welding performance will be reduced when modified by other elements, and provides a medium-strength weldable and corrosion-resistant 6xxx Aluminum alloy and its preparation method

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  • A medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy and its preparation method

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Experimental program
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specific Embodiment approach 1

[0012] Specific Embodiment 1: In this embodiment, a medium-strength weldable and corrosion-resistant 6xxx aluminum alloy is composed of 0.8-1.6% Mg, 1.2-1.8% Si, 0.4-1.2% Mn, 0.1-0.7% Cu, 0.3- 0.8% Zn, 0.1-0.5% Fe, 0.1-0.5% Cr, 0.01-0.06% rare earth elements, the balance is composed of Al and other unavoidable impurity elements; the total mass of other unavoidable impurity elements does not exceed the total mass of the alloy 0.15%.

[0013] This embodiment forms more Mg by adjusting the element content of Mg and Si 2 Si precipitation phase increases precipitation strengthening effect. In addition, the generation of brittle phases containing Fe, which is not conducive to the toughness of the alloy, is regulated by adding Mn elements, and the formation of Al 5 mn 5 Phase, increase corrosion resistance and improve plasticity; adding rare earth elements erbium, lanthanum and lutetium has three effects, first, rare earth elements have a strong effect of refining grains, increasi...

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the rare earth elements are composed of 40-60% Er, 25-35% La and 5-15% Lu by mass percentage. Others are the same as the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy is composed of 1.56% Mg, 1.63% Si, 1% Mn, 0.5% Cu, 0.6 %Zn, 0.45% Fe, 0.26% Cr, 0.05% rare earth elements, the balance is composed of Al and other unavoidable impurity elements; the total mass of other unavoidable impurity elements does not exceed 0.15% of the total mass of the alloy. Others are the same as those in Embodiment 1 or 2.

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Abstract

A medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy and a preparation method thereof. The invention relates to the field of aluminum alloy smelting and casting, in particular to a medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy and a preparation method thereof. The invention aims to solve the problems that the strength and hardness of the existing 6XXX series aluminum alloys are low, and the toughness, corrosion resistance and welding performance will be reduced when other elements are used for modification. The aluminum alloy consists of 0.8-1.6% Mg, 1.2-1.8% Si, 0.4-1.2% Mn, 0.1-0.7% Cu, 0.3-0.8% Zn, 0.1-0.5% Fe, 0.1-0.5% Cr, 0.01- 0.06% rare earth elements, the balance is composed of Al and other unavoidable impurity elements. Methods: 1. Melting the aluminum alloy according to the mass ratio; 2. Homogenizing treatment; 3. Heat treatment and hot extrusion. The invention is used for improving the comprehensive performance of 6XXX aluminum alloy.

Description

technical field [0001] The invention relates to the field of aluminum alloy smelting and casting, in particular to a medium-strength weldable and corrosion-resistant 6xxx series aluminum alloy and a preparation method thereof. Background technique [0002] 6xxx series aluminum alloys are the most widely used and produced aluminum alloys. The existing 6xxx series aluminum alloys have been used in important industries such as aerospace, weaponry, transportation, and electric power. However, with the expansion of the application range, it is found that the strength, toughness, weldability and corrosion resistance of 6xxx series aluminum alloys have been severely challenged. [0003] The 6xxx series is an Al-Mg-Si alloy, which is an aluminum alloy that can be precipitated and strengthened, and the main strengthening phase is Mg 2 Si, however, currently the content of alloying elements in 6xxx series aluminum alloys is low, for example, the content of Mg is 0.3%-1.2%; the conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/02C22C21/08C22F1/043C22F1/047
CPCC22C1/026C22C1/03C22C21/02C22C21/08C22F1/043C22F1/047
Inventor 黄铁明黄铁兴冯永平刘金霞戴应鑫
Owner 福建祥鑫股份有限公司