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Al-Mg alloy with high intergranular corrosion resistance and preparation method thereof

An intergranular corrosion and alloy technology, applied in the field of materials, can solve problems such as limited equipment size and inability to prepare large-scale samples, and achieve the effect of optimizing intergranular corrosion resistance and reducing potential difference

Inactive Publication Date: 2019-09-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods require expensive equipment support, and are limited by the size of the equipment, making it impossible to prepare large-scale samples

Method used

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  • Al-Mg alloy with high intergranular corrosion resistance and preparation method thereof
  • Al-Mg alloy with high intergranular corrosion resistance and preparation method thereof
  • Al-Mg alloy with high intergranular corrosion resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Take Mg: 3.5wt%, Mn: 0.3wt%, Zn: 0.2wt%, Ti: 0.09wt%, Ru: 0.05wt% according to the weight percentage of the constituent elements, and the balance is Al. Melt the above materials in a melting furnace at a melting temperature of 780°C until melting;

[0035] 2) After the alloy melt is added with multiple refining agents and degassing agents, it is refined and degassed and slag removed, and then allowed to stand for 8 minutes;

[0036] 3) Pouring the alloy melt into a cylindrical mold in an electromagnetic stirring device, performing low-frequency electromagnetic stirring at 15 Hz for 30 s, and then water-cooling to form an ingot;

[0037] 4) The ingot is subjected to homogenization treatment, the homogenization temperature is 560° C., and the time is 48 hours. After the treatment is completed, it is water quenched at room temperature.

Embodiment 2

[0039] 1) Take Mg: 4.2wt%, Mn: 0.6wt%, Zn: 0.25wt%, Ti: 0.09wt%, Ru: 0.05wt% according to the weight percentage of the constituent elements, and the balance is Al. Melt the above materials in a melting furnace at a melting temperature of 760°C until melting;

[0040] 2) After the alloy melt is added with multi-element refining agent and degassing agent, it is refined and degassed and slag removed, and then allowed to stand for 8 minutes;

[0041] 3) Pouring the alloy melt into a cylindrical mold in an electromagnetic stirring device, performing low-frequency electromagnetic stirring at 15 Hz for 30 s, and then water-cooling to form an ingot;

[0042] 4) The ingot is subjected to homogenization treatment, the homogenization temperature is 570° C., and the time is 18 hours. After the treatment, it is water quenched at room temperature.

Embodiment 3

[0044] 1) Take Mg: 4.2wt%, Mn: 0.6wt%, Zn: 0.3wt%, Ti: 0.15wt%, Ru: 0.08wt% according to the weight percentage of the constituent elements, and the balance is Al. Melt the above materials in a melting furnace at a melting temperature of 800°C until melting;

[0045] 2) After the alloy melt is added with multiple refining agents and degassing agents, it is refined and degassed and slag removed, and then allowed to stand for 8 minutes;

[0046] 3) Pouring the alloy melt into a cylindrical mold in an electromagnetic stirring device, performing low-frequency electromagnetic stirring at 15 Hz for 30 s, and then water-cooling to form an ingot;

[0047] 4) The ingot is subjected to homogenization treatment, the homogenization temperature is 550° C., and the time is 48 hours. After the treatment, it is water quenched at room temperature.

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Abstract

The invention discloses an Al-Mg alloy material with high intergranular corrosion resistance. The alloy comprises Ru, Mg, Mn, Zn, Ti and Al. According to the alloy, in a corrosive medium, Ru can increase the current density of a cathode reaction, so that an alpha(Al) surface spontaneously generates Al2O3.3H2O with the thickness of 300 nm and a compact, self-repairing high-corrosion-resistance passivation film. The erosion of the corrosive medium to a beta(Al3Mg2) phase is effectively blocked, and the intergranular corrosion resistance of the alloy is greatly improved. By adjusting the proportion of M(Mg) to M(Mn) to M(Zn), a tau(Mg32(Al,Zn)49) phase can be separated out from the alloy, separation of the beta(Al3Mg2) phase is inhibited, the potential difference between a second phase and analuminum matrix is reduced, and the intergranular corrosion resistance of the alloy is further improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to an Al-Mg alloy with high resistance to intergranular corrosion and a preparation method thereof. Background technique [0002] Al-Mg series alloys are widely used as lightweight substitutes for steel due to their high strength-to-weight ratio, excellent formability and weldability, and good corrosion resistance. The required mechanical strength of Al-Mg alloys is mainly achieved by solid solution strengthening and work hardening by cold working. The maximum solubility of Mg decreases to about 1.7 wt% at room temperature. When the Al-Mg alloy contains more than 3.5wt% Mg, Mg atoms preferentially diffuse from the supersaturated solid solution α(Al) to the grain boundary (GB), and finally can form β(Al 3 Mg 2 )Mutually. β(Al 3 Mg 2 ) phase potential (-1.24V) is lower than that of α (Al) potential (-0.812V). In a corrosive environment, the matrix is ​​preferentially corroded, causing l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C1/03C22F1/047C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/06C22F1/002C22F1/047
Inventor 王斌马明阳易丹青
Owner CENT SOUTH UNIV
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