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Preparation method of Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy

A rare earth magnesium and alloy technology, applied in the field of alloy or non-ferrous metal processing, can solve the problem of magnesium alloy being easily corroded, and achieve the effects of uniform structure distribution, improved corrosion performance, and refined structure distribution.

Active Publication Date: 2019-01-01
镁高镁诺奖(铜川)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inherent activity of magnesium, small electronegativity and relatively negative electrode potential, magnesium alloys are easily corroded

Method used

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  • Preparation method of Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy
  • Preparation method of Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The composition of the Mg-Al-Zn-Mn magnesium alloy of this embodiment and the weight percentage of each component are: Al: 9.33%; Zn: 0.88%; Mn: 0.53%; the balance is Mg.

[0013] Melting and casting process: Put the Mg-Al-Zn-Mn alloy into a crucible at a furnace temperature of 760°C and heat it to melt, then keep it warm for 10 minutes; then extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment, ultrasonic The intensity is 2000w, each ultrasonic time is 6 seconds, the intermittent time is 4 seconds, and the total ultrasonic time is 500 seconds; finally, the alloy melt is quickly poured into the preheated metal mold.

[0014] Results: The alloy of this example was corroded in 3.5% NaCl solution at room temperature for 24 hours, and the weight loss corrosion rate was 0.296 mg cm -2 ·day -1 .

Embodiment 2

[0015] Embodiment 2: The Mg-Al-Zn-Mn-Gd corrosion-resistant rare earth magnesium alloy of this embodiment, its composition and the weight percentage of each component are: Al: 10.5%; Zn: 0.97%; Mn: 0.60%; Gd : 0.50%; the balance is Mg element.

[0016] Melting and casting process: Put the Mg-Al-Zn-Mn alloy into a crucible at a furnace temperature of 770°C and heat it to melt, then add a small piece of Mg-20%Gd master alloy wrapped in aluminum foil, and keep it warm for 12 minutes until the alloy is completely melted. Melting; then extend the ultrasonic horn into the alloy melt for intermittent ultrasonic treatment, the ultrasonic intensity is 2500w, each ultrasonic time is 5 seconds, the intermittent time is 10 seconds, and the total ultrasonic time is 450 seconds; finally, the alloy melt is quickly Pouring in preheated metal molds.

[0017] Results: The alloy of this example was corroded in 3.5% NaCl solution at room temperature for 24 hours, and the weight loss corrosion ra...

Embodiment 3

[0018] Embodiment 3: The Mg-Al-Zn-Mn-Gd corrosion-resistant rare earth magnesium alloy of this embodiment, its composition and the weight percentage of each component are: Al: 9.75%; Zn: 1.12%; Mn: 0.65%; Gd : 1.00%; the balance is Mg element.

[0019] Melting and casting process: Put the Mg-Al-Zn-Mn alloy into a crucible at a furnace temperature of 780°C and heat it until it melts, then add a small piece of Mg-20%Gd master alloy wrapped in aluminum foil, and keep it warm for 15 minutes until the alloy is completely melted. Melting; then extend the ultrasonic horn into the alloy melt for intermittent ultrasonic treatment, the ultrasonic intensity is 3000w, each ultrasonic time is 10 seconds, the intermittent time is 5 seconds, and the total ultrasonic time is 450 seconds; finally, the alloy melt is quickly Pouring in preheated metal molds.

[0020] Results: The alloy of this example was corroded in 3.5% NaCl solution at room temperature for 24 hours, and the weight loss corro...

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Abstract

The invention relates to a preparation method of an Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy. The method comprises the following steps of putting an alloy of Mg-Al-Zn-Mn series into a crucible with a furnace temperature of 760-780 DEG C, heating until melting, adding a small block-shaped Mg-20% Gd intermediate alloy wrapped witth aluminum-foil paper, and preserving heat for 10-15 minutes until the alloy is completely melted; then stretching an ultrasonic amplitude transformer into above alloy melt to perform intermittent ultrasonic treatment at the intensity of 2,000-3,000w for 5-10 seconds each time every other 5-10 seconds, wherein time amounts to 300-500 seconds; finally pouring the alloy melt in a preheated metal mold to obtain the Mg-Al-Zn-Mn-Gd corrosion resistant rare earth magnesium alloy. The fine second-phase tissue of the alloy provided by the invention is more uniformly distributed, and meanwhile, the addition of rare earth elements forms a cathode phase of which the self corrosion potential is low, so that all the properties of the alloy are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of processing alloys or nonferrous metals. Background technique [0002] Magnesium-aluminum (Mg-Al) alloy is widely used in various forms of mechanical parts due to its excellent performance and low price. It is currently the most widely used high-strength wrought magnesium alloy. However, magnesium alloys are easily corroded due to the inherent activity of magnesium, small electronegativity and relatively negative electrode potential. To solve this problem, new magnesium alloys need to be developed. [0003] In recent years, rare earth alloying treatment is one of the favorable ways to improve the corrosion resistance of magnesium alloys. The research of Li Xiao et al. showed that: adding rare earth element Sm to AZ31 and AZ91 magnesium alloys, Al which is easily formed in the alloy 2 The Sm intermetallic compound will slow down the microgalvanic corrosion rate of the alloy and significantly improve the ...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03
CPCC22C1/03C22C23/02
Inventor 胡志殷正闫洪
Owner 镁高镁诺奖(铜川)新材料有限公司
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