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High-strength high-corrosion-resistance cast aluminum alloy and gravity casting manufacturing method thereof

A technology of casting aluminum alloy and gravity casting, which is applied in the field of high corrosion-resistant cast aluminum alloy and its gravity casting preparation, high strength field, and can solve the problems of high standard electrode potential of Cu-rich phase, poor welding and brazing performance, and high Cu content , to achieve the effect of improving mechanical properties and corrosion resistance, improving performance and low impurity content

Inactive Publication Date: 2016-03-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because of the high content of Cu in A380, the standard electrode potential of the generated Cu-rich phase is high, and it is easy to corrode in a humid or liquid environment.
A360 aluminum alloy is also a widely used Al-Si alloy. Compared with A380, the most significant difference is that the Cu content is low, with a maximum value of 0.6%. The copper-rich formed is much less than A380, and its corrosion resistance is slightly better than A380 alloy, but due to its poor welding and brazing performance, its application in industrial production is limited, and it is generally used as a cover plate and an instrument casing

Method used

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  • High-strength high-corrosion-resistance cast aluminum alloy and gravity casting manufacturing method thereof
  • High-strength high-corrosion-resistance cast aluminum alloy and gravity casting manufacturing method thereof
  • High-strength high-corrosion-resistance cast aluminum alloy and gravity casting manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] The weight percent of a high-strength, high-corrosion-resistant cast aluminum alloy is: according to the theoretical ratio, Si8.5%, Mg0.4%, Mn0.5%, Zn0.5%, Sr0.04%, Cu0.25%, Ti0.3%, Zr0.3%, V0.3%, Fe0.4%, the balance is Al and unavoidable impurities.

[0034] Its preparation method is (1) industrial pure aluminum (Al: 99.7wt%), industrial pure magnesium (Mg: 99.95wt%) and industrial pure zinc (Zn: 99.9wt%), and the master alloy AlSi23, AlMn10, AlZr4, AlTi5B1, AlV5, AlFe20, AlCu50, and AlSr10 were polished with 320-grit sandpaper to remove the oxide layer, respectively, and placed in a blast drying oven (200°C) for drying and preheating; (2) stainless steel crucibles were used for alloy casting. , slag removal tools, bell jars and other surfaces are cleaned and rust-removed and coated with paint. The paint is made of 25% talc powder and 5% water glass with an appropriate amount of water, and then baked in an oven at 200°C overnight to remove moisture. Before it can be u...

Embodiment 2

[0039] The weight percent of a high-strength, high-corrosion-resistant cast aluminum alloy is: according to the theoretical ratio, Si7%, Mg0.2%, Mn0.2%, Zn0%, Sr0.02%, Cu0%, Ti0.01%, Fe0 .2%, the balance is Al and unavoidable impurities.

[0040] Its preparation method is (1) with industrial pure aluminum (Al: 99.7wt%) and industrial pure magnesium (Mg: 99.95wt%), and master alloy AlSi23, AlMn10, AlFe20AlTi5B1 and AlSr10 with 320 mesh sandpaper polishing respectively to remove oxide layer, Put them into blast drying oven (200°C) for drying and preheating; (2) use stainless steel crucible for alloy casting, clean and derust the surface of crucible, slag removal tool, bell jar, etc. before use and apply paint. 25% talcum powder and 5% water glass are mixed with an appropriate amount of water, and then baked in an oven at 200°C overnight to remove moisture before use. The temperature gradient of the resistance heating furnace is raised to 710°C, which will account for the mass of...

Embodiment 3

[0045] A high-strength, high-corrosion-resistant cast aluminum alloy and its preparation method are as follows: according to the theoretical ratio, Si15%, Mg0.6%, Mn1%, Zn1%, Sr0.1%, Cu0.5%, Ti0. 5%, Zr0.5%, V0.5%, Fe1%, the balance is Al and unavoidable impurities.

[0046] Its preparation method is (1) industrial pure aluminum (Al: 99.7wt%), industrial pure magnesium (Mg: 99.95wt%) and industrial pure zinc (Zn: 99.9wt%), and the master alloy AlSi23, AlMn10, AlZr4, AlTi5B1, AlV5, AlFe20, AlCu50, and AlSr10 were polished with 320-grit sandpaper to remove the oxide layer, respectively, and placed in a blast drying oven (200°C) for drying and preheating; (2) stainless steel crucibles were used for alloy casting. , slag removal tools, bell jars and other surfaces are cleaned and rust-removed and coated with paint. The paint is made of 25% talc powder and 5% water glass with an appropriate amount of water, and then baked in an oven at 200°C overnight to remove moisture. Before it...

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Abstract

The invention provides high-strength high-corrosion-resistance cast aluminum alloy and a gravity casting manufacturing method of the high-strength high-corrosion-resistance cast aluminum alloy. The alloy is composed of Si, Mg, Fe, Mg, Zn, Sr, Cu, M and the balance Al according to certain weight percentages, wherein the M is at least one of Ti, Zr and V or the RE element is added to the M. The cast aluminum alloy has the excellent cast performance and good mechanical property. The tensile strength, the yield strength and elongation are improved, good corrosion resistance is achieved, the aluminum alloy can be applied to automobile parts without solid solution heat treatment, and the requirement of low-weight development of automobiles is met.

Description

technical field [0001] The invention relates to a high-strength, high-corrosion-resistant cast aluminum alloy and a preparation method thereof by gravity casting, belonging to the field of industrial aluminum alloys and their manufacture. Background technique [0002] Al-Si series alloys have good fluidity, dense castings, and are not easy to produce casting cracks. They have good casting performance, corrosion resistance and moderate cutting performance. They are ideal casting alloys and have become the most valued in the manufacturing industry. One of the structural materials. However, the mechanical properties of cast Al-Si alloys are not satisfactory at present, the strength and hardness are average, and the toughness is low. A380 aluminum alloy is the most widely used Al-Si alloy, its Si content is as high as 7.5wt% ~ 9.5wt%, it has good casting performance, and high Cu content (3.0wt% ~ 4.0wt%) can obtain high Strength and good processability, it has been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06
Inventor 叶兵鲍庆煌蒋海燕丁文江
Owner SHANGHAI JIAO TONG UNIV
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