High-hardness corrosion-resistance aluminum-silicon-copper series cast aluminum alloy obtained through zirconium-strontium composite microalloying and magnesium alloying and preparing method

A casting aluminum alloy and micro-alloying technology, which is applied in the field of aluminum alloy materials, can solve the problems of low hardness, low corrosion resistance, and reduced alloy casting performance, and achieve the effect of increasing corrosion rate and improving hardness

Inactive Publication Date: 2017-10-10
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to solve the problems of low hardness and corrosion resistance of Al-Si(-Cu) cast aluminum alloys at present, and to invent a method based on the composition design of Al-Si-Cu cast aluminum alloys, by adjusting Si, Cu element content, while adding trace zirconium (Zr), strontium (Sr) elements and a small amount of magnesium (Mg) elements for composite alloying, without reducing the casting performance (fluidity) of the alloy, while efficiently refining the Si phase in the alloy and the compound phase, greatly improving the hardness and corrosion resistance of the alloy, obtaining an Al-Si-Cu cast aluminum alloy with excellent casting performance and high hardness and corrosion resistance, and providing its preparation method

Method used

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  • High-hardness corrosion-resistance aluminum-silicon-copper series cast aluminum alloy obtained through zirconium-strontium composite microalloying and magnesium alloying and preparing method
  • High-hardness corrosion-resistance aluminum-silicon-copper series cast aluminum alloy obtained through zirconium-strontium composite microalloying and magnesium alloying and preparing method
  • High-hardness corrosion-resistance aluminum-silicon-copper series cast aluminum alloy obtained through zirconium-strontium composite microalloying and magnesium alloying and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 , 2 , 3, 4, and 5.

[0033] A Zr, Sr composite microalloying and Mg alloying high hardness and corrosion resistant Al-Si-Cu cast aluminum alloy, its preparation method:

[0034]First A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe, all components of the present invention are represented by mass percentage, the technical Personnel can convert it into weight or mass through conventional calculations, the same below, all components that add up to less than 100% are impurities) After the master alloy is melted, the temperature is raised to 850±10°C, and then Al-Cu (49.62% Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy, Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy, Al-Sr(89.86%Al, 9.89% Sr, 0.15%Fe, 0.10%Si ) master alloy; after all master alloys and metals are melted, adjust the temperature to 750±10°C, add pure Mg, after it melts, add hexachloroethane to refine and degas until there is no gas After stan...

Embodiment 2

[0038] A Zr, Sr composite microalloying and Mg alloying high hardness and corrosion resistant Al-Si-Cu cast aluminum alloy, its preparation method:

[0039] First A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe, all components of the present invention are expressed in mass percentage, the same below, All the components added up to less than 100% are impurities) the master alloy is melted and heated to 850±10°C, and then Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy is added in sequence , Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy, Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy; After the alloy and metal are melted, adjust the temperature to 750±10°C, add pure Mg, and after it melts, add hexachloroethane to refine and degas until no gas escapes, keep it for 5 to 10 minutes, then remove the slag and pour it into Preheating to 300±10°C in a metal mold and casting into an ingot; that is, a Zr, Sr composi...

Embodiment 3

[0043] A Zr, Sr composite microalloying and Mg alloying high hardness and corrosion resistant Al-Si-Cu cast aluminum alloy, its preparation method:

[0044] First A00 grade pure Al (99.79%Al, 0.14%Fe, 0.04%Si) and Al-Si (89.62%Al, 10.21%Si, 0.17%Fe, all components of the present invention are expressed in mass percentage, the same below, All the components added up to less than 100% are impurities) the master alloy is melted and heated to 850±10°C, and then Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si ) master alloy is added in sequence , Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si ) master alloy, Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si ) master alloy; After the alloy and metal are melted, adjust the temperature to 750±10°C, add pure Mg, and after it melts, add hexachloroethane to refine and degas until no gas escapes, keep it for 5 to 10 minutes, then remove the slag and pour it into Preheating to 300±10°C in a metal mold and casting into an ingot; that is, a Zr, Sr composi...

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Abstract

A kind of Zr, Sr composite microalloying and Mg alloying high hardness corrosion-resistant Al-Si-Cu cast aluminum alloy, it is characterized in that described aluminum alloy is mainly made of aluminum (Al), silicon (Si), copper (Cu ), magnesium (Mg), zirconium (Zr), strontium (Sr), and iron (Fe). The preparation method sequentially includes: (1) melting pure Al and Al-Si master alloys and raising the temperature to 850°C, and then sequentially adding Al-Cu, Al-Zr and Al-Sr master alloys; (2) waiting for all the master alloys After the alloy and metal are melted, adjust the temperature to 750°C, add pure Mg, and after it melts, add hexachloroethane for refining and degassing until no gas escapes, keep it for 5-10 minutes, then remove the slag and cast it into an ingot. The aluminum alloy of the present invention has a dense as-cast structure, an average unnotched impact toughness at room temperature of 16.35J / cm2, a tensile strength of 262.132MPa, and an elongation of 5.645%. At the same time, when it is immersed in a 3.5% NaCl aqueous solution at a temperature of 37°C for 93 hours The uniform corrosion rate is 0.321081508mm / y.

Description

technical field [0001] The present invention relates to an aluminum alloy material, in particular to a novel high-hardness, corrosion-resistant Al-Si-Cu cast aluminum alloy and a preparation method thereof, in particular to a Zr, Sr composite micro-alloyed and Mg-alloyed A high-hardness, corrosion-resistant Al-Si-Cu cast aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si (-Cu) cast aluminum alloys are currently the most widely used cast aluminum alloy materials in the industry. The numbers of such alloys are: such as domestic YL102 (AlSi12), YL112 (AlSi8.5Cu3.5), YL113 ( AlSi811Cu3), Japan's ADC12 (AlSi11Cu3), ADC10 (AlSi8.5Cu3.5) and American A380 (AlSi8.5Cu3.5), etc. These alloys have excellent casting properties, high strength and good corrosion resistance. However, its plasticity and toughness are relatively low, which limits its application. [0003] It is well known that the mechanical properties of Al-Si (-Cu) cast aluminum alloys a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03
CPCC22C21/02C22C1/026C22C1/03C22C21/003
Inventor 许晓静张进松王天伦黄鹏张冲杜东辉贾伟杰陈汉辉
Owner JIANGSU UNIV
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