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High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof

A technology for casting aluminum alloys and cast aluminum alloys, which is applied in the field of industrial aluminum alloys and manufacturing, can solve the problems of high standard electrode potential of Cu-rich phase, poor welding and brazing performance, and high Cu content, so as to improve mechanical properties and Corrosion resistance, good corrosion resistance, excellent mechanical properties

Active Publication Date: 2016-04-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 series die-casting alloy. Compared with A380, the most significant difference is that the Cu content is low, the maximum value is 0.6%, and the copper-rich formed is much less than A380, and the corrosion resistance is also slightly better. It is based on A380 alloy, but its application in industrial production is limited due to its poor welding and brazing performance. It is generally used as a cover plate and an instrument shell

Method used

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  • High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof
  • High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof
  • High-strength and high-corrosion-resistance cast aluminum alloy and pressure casting preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The weight percentage of a high-strength and high-corrosion-resistant cast aluminum alloy is: according to the theoretical ratio, Si12%, Mg0.4%, Mn0.5%, Zn0.5%, Sr0.04%, Cu0.25%, Ti0. 3%, Zr0.3%, V0.3%, Fe0.6%, the balance is Al and inevitable impurities.

[0034] The preparation method is (1) combining industrial pure aluminum (Al: 99.7 wt %), industrial pure magnesium (Mg: 99.95 wt %) and industrial pure zinc (Zn: 99.9 wt %), and intermediate alloys 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) Use a stainless steel crucible for alloy casting, before using the crucible , slag removal tools, bell jars and other surfaces are cleaned and derusted and coated with paint. The paint is mixed with 25% talcum powder and 5% water glass and added with appropriate amount of water, and then placed in a 200 ℃ oven...

Embodiment 2

[0039] The weight percentage of a high-strength and high-corrosion-resistant cast aluminum alloy is: according to the theoretical ratio, Si7%, Mg0.2%, Mn0.2%, Zn0%, Sr0.02%, Cu0%, Ti0.01%, Fe0 .4%, the balance being Al and inevitable impurities.

[0040] The preparation method is as follows: (1) industrially pure aluminum (Al: 99.7wt%) and industrially pure magnesium (Mg:99.95wt%), and intermediate alloys AlSi23, AlMn10, AlFe20, AlTi5B1 and AlSr10 are respectively polished with 320-mesh sandpaper to remove oxidation. (2) Use a stainless steel crucible for alloy casting, clean the surface of the crucible, slag removal tool, bell jar, etc. before use, remove rust and coat with paint. The coating is made of 25% talc powder and 5% water glass and then added with an appropriate amount of water. It can be used after baking in a 200 ℃ oven overnight to remove the water. The temperature gradient of the resistance heating furnace is raised to 710 ℃. After pure aluminum with about 10% ...

Embodiment 3

[0045] The weight percentage of a high-strength, high-corrosion-resistant cast aluminum alloy and a preparation method thereof is: 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 inevitable impurities.

[0046] The preparation method is (1) combining industrial pure aluminum (Al: 99.7 wt %), industrial pure magnesium (Mg: 99.95 wt %) and industrial pure zinc (Zn: 99.9 wt %), and intermediate alloys 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) Use a stainless steel crucible for alloy casting, before using the crucible , slag removal tools, bell jars and other surfaces are cleaned and derusted and coated with paint. The paint is mixed with 25% talcum powder and 5% water glass and added with appropriate amount of water, and then ...

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Abstract

The invention provides high-strength and high-corrosion-resistance cast aluminum alloy and a pressure casting preparation method thereof. The alloy is prepared from, by a certain weight percent, Si, Mg, Fe, Mg, Zn, Sr, Cu, M and the balance Al, wherein M is at least one element of Ti, Zr and V, or the element RE is added in M. After the high-strength and high-corrosion-resistance cast aluminum alloy is subjected to pressure casting, the room temperature tensile strength sigma b of alloy not subjected to heat treatment is larger than or equal to 315 MPa, the room temperature ductility sigma of the alloy not subjected to heat treatment is larger than or equal to 3.0%, and good corrosion resistance is achieved; and the alloy can be applied to automobile parts without ageing or solid solution heat treatment, and the requirement for light automobile development is met.

Description

technical field [0001] The invention relates to a high-strength, high-corrosion-resistant cast aluminum alloy and a pressure casting preparation method thereof, belonging to the field of industrial aluminum alloy and manufacturing. Background technique [0002] Al-Si alloys have good fluidity, dense castings, and are not prone to casting cracks. They have good casting properties, corrosion resistance and moderate machinability. They are ideal casting alloys and have become the most important casting alloys 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 an American brand of die-casting aluminum alloy, and it is also the most widely used Al-Si alloy. 4.0wt%) can obtain high strength and good workability, and has been widely used in various fields such as transportation industry (autom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/02C22F1/043
Inventor 叶兵丁文江鲍庆煌蒋海燕
Owner SHANGHAI JIAO TONG UNIV
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