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A kind of preparation method of ultrasonic mg-al-zn-mn-nd corrosion-resistant rare earth magnesium alloy

A rare-earth magnesium and alloy technology, which is applied in the field of alloy or non-ferrous metal processing, can solve the problem of anode corrosion rate reduction and achieve the effects of uniform tissue distribution, fine tissue distribution, and improved corrosion performance

Active Publication Date: 2020-07-14
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

T. Zhang et al pointed out that after the addition of Nd element, the reduction of twinning and dislocation density reduces the corrosion rate of the anode

Method used

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  • A kind of preparation method of ultrasonic mg-al-zn-mn-nd corrosion-resistant rare earth magnesium alloy
  • A kind of preparation method of ultrasonic mg-al-zn-mn-nd 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: 7.21%; Zn: 1.23%; Mn: 0.72%; the balance is Mg element.

[0013] Melting and casting process: Put the Mg-Al-Zn-Mn alloy into a crucible at a furnace temperature of 730°C and heat it until it melts, then keep it warm for 8 minutes; then insert the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment, ultrasonic The intensity is 1000w, each ultrasonic time is 12 seconds, the intermittent time is 13 seconds, and the total ultrasonic time is 700 seconds; finally, the alloy melt is quickly poured into the preheated metal mold.

[0014] Results: The alloy in this example was corroded in 3.5% NaCl solution at room temperature for 24 hours, and the weight loss corrosion rate was 0.324mg cm -2 ·day -1 .

Embodiment 2

[0015] Embodiment 2: The Mg-Al-Zn-Mn-Nd corrosion-resistant rare earth magnesium alloy of this embodiment, its composition and the weight percentage of each component are: Al: 7.86%; Zn: 1.31%; Mn: 0.75%; Nd : 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 750°C and heat it to melt, then add a small piece of Mg-20%Nd master alloy wrapped in aluminum foil, and keep it warm for 9 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 1200w, each ultrasonic time is 10 seconds, the intermittent time is 15 seconds, and the total ultrasonic time is 800 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-Nd corrosion-resistant rare earth magnesium alloy of this embodiment, its composition and the weight percentage of each component are: Al: 8.65%; Zn: 1.48%; Mn: 0.87%; Nd : 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 740°C and heat it until it melts, then add a small piece of Mg-20%Nd master alloy wrapped in aluminum foil, and keep it warm for 10 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 1800w, each ultrasonic time is 15 seconds, the intermittent time is 5 seconds, and the total ultrasonic time is 900 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

A preparation method of an ultrasonic Mg-Al-Zn-Mn-Nd corrosion resistant rare earth magnesium alloy comprises the steps: putting a Mg-Al-Zn-Mn series alloy into a crucible with the furnace temperatureof 730-750 DEG C, heating and melting, adding small block Mg-20% Nd intermediate alloy wrapped by aluminum-foil paper, and carrying out heat preservation until the alloy is melted completely; then extending an ultrasonic amplitude-change pole into the alloy melt, and carrying out intermittent ultrasonic treatment, wherein the intensity is 1000-2000 W, the intermittent ultrasonic treatment is performed for 15-20 s each time and is performed every other 15-20 s, and the total time is 700-900 s; and finally, rapidly pouring into a preheated metal die, wherein the obtained alloy comprises the components by the weight percentage: 7.0-9.1% of aluminum, 1.2-1.5% of zinc, 0.7-0.9% of manganese, 0.5-1.5% of neodymium, and the balance magnesium. A second phase structure of the alloy is more uniformin distribution, a cathode phase with low self-corrosion potential is formed by addition of rare earth elements, and the whole corrosion performance of the alloy is greatly 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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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C23/02C22B9/02
CPCC22B9/026C22C1/03C22C23/02
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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