A corrosion-resistant aluminum alloy used in high-temperature coastal industrial environments and its preparation method

An industrial environment, aluminum alloy technology, applied in the field of aluminum alloys, can solve the problems of reducing the intergranular corrosion resistance of alloys, endangering the normal operation of equipment, and poor pitting corrosion resistance of alloys, so as to achieve improved strength, long service life, and enhanced durability. The effect of corrosion performance

Active Publication Date: 2019-02-26
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the corrosion resistance of 2xxx series aluminum alloys is very poor.
This is mainly because the addition of Cu can significantly change the electrode potential in solid solution, and the pitting resistance of the alloy is relatively poor.
However, the Cu-poor region of the grain boundary forms a galvanic battery with the precipitated phase or matrix of the grain boundary, which reduces the intergranular corrosion resistance of the alloy.
It can be seen that when the existing cylinder and cover materials 5xxx aluminum alloy and 2xxx aluminum alloy are used in an industrial environment, the service life of both is relatively short, and the normal operation of the equipment is endangered.

Method used

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  • A corrosion-resistant aluminum alloy used in high-temperature coastal industrial environments and its preparation method
  • A corrosion-resistant aluminum alloy used in high-temperature coastal industrial environments and its preparation method

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Embodiment 2

[0039] A method for preparing aluminum alloys resistant to corrosion in industrial environments, comprising the following steps:

[0040] (1) Weigh the following elements by mass percentage: Mg: 2.6%, Cr: 0.2%, Cu: 0.05%, Mn: 0.1%, Zn: 0.1%, Er: 0.2%, and Al is the balance.

[0041] (2) First put pure Al into a medium-frequency electromagnetic induction melting furnace, raise the temperature in the furnace to 730-780°C, and add refractory intermediate alloys Al-Mn, Al-Cu, Al-Cr, Al-Fe, Al-Si, Al-Er, when the temperature rises to about 740°C, keep it warm for 10-15 minutes, then add the fusible elemental metal Zn, Mg, press it into the bottom when adding Mg to prevent burning, add the metal completely After melting, keep it at 730-740°C for 25-30 minutes. During this process, measure the temperature frequently to prevent over-burning; then add refining agent ZS-AJ 04C 3.8~4.0g / kg, then add slag removal agent ZS-AZ 6 3.2 ~ 3.5g / kg, keep warm for 8 ~ 10 minutes and then remov...

Embodiment 3

[0048] An aluminum alloy for industrial environment corrosion resistance and a preparation method thereof, comprising the following steps:

[0049] (1) Weigh the following elements by mass percentage: Mg: 2.6%, Cr: 0.2%, Cu: 0.05%, Mn: 0.1%, Zn: 0.1%, Er: 0.56%, and Al is the balance.

[0050] (2) First put pure Al into a medium-frequency electromagnetic induction melting furnace, raise the temperature in the furnace to 730-780°C, and add refractory intermediate alloys Al-Mn, Al-Cu, Al-Cr, Al-Fe, Al-Si, Al-Er, when the temperature rises to about 740°C, keep it warm for 10-15 minutes, then add the fusible elemental metal Zn, Mg, press it into the bottom when adding Mg to prevent burning, add the metal completely After melting, keep it at 730-740°C for 25-30 minutes. During this process, measure the temperature frequently to prevent over-burning; then add refining agent ZS-AJ 04C 3.8~4.0g / kg, then add slag removal agent ZS-AZ 6 3.2 ~ 3.5g / kg, keep warm for 8 ~ 10 minutes and...

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Abstract

The invention relates to the technical field of aluminum alloys, in particular to a corrosion-resistant aluminum alloy for a power system in a high-temperature coastal industrial environment and a preparation method of the corrosion-resistant aluminum alloy. The corrosion-resistant aluminum alloy comprises the ingredients of, in percentage by mass, 2.5-2.8% of Mg, 0.1-0.3% of Cr, 0.02-0.06% of Cu, 0.07-0.1% of Mn, 0.08-0.12% of Zn, 0.2-0.6% of Er, less than 0.25% of Si, less than 0.4% of Fe and the balance Al. The added trace rare earth element Er and other elements have a good modification effect on the aluminum alloy tissue in a proper proportion, crystalline grains are refined, the strength is improved, and the corrosion-resistant performance of the alloy is enhanced. According to the preparation method, an existing technology is improved, and the process is mature and stable. By means of the rare-earth-modified aluminum alloy, the requirements for the mechanical properties of a GIS barrel and a cover plate can be met while excellent corrosion-resistant performance can also be achieved, a longer service life is achieved, and the use cost of a GIS system is lowered.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a corrosion-resistant aluminum alloy used for power systems in high-temperature coastal industrial environments and a preparation method thereof. Background technique [0002] As the main structural material of national economic production and life, aluminum alloy has many characteristics such as low density, high strength, easy forming and processing, good electrical and thermal conductivity, and relatively rich resources. It is the most widely used non-ferrous metal structural material in the national economy. , It is widely used in the fields of aerospace, transportation, building materials, petrochemical, electronics, electric power and national defense. [0003] Because GIS system has many advantages such as safe and reliable operation, flexible configuration, strong environmental adaptability, long maintenance cycle, and convenient installation, GIS system has been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/06C22C21/08C22C1/03C22F1/047
CPCC22C1/026C22C1/03C22C21/06C22C21/08C22F1/047
Inventor 张新房张迪刘学兵钱洲亥周海飞金东春
Owner UNIV OF SCI & TECH BEIJING
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