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Anti-corrosion magnalium base alloy and preparation method thereof

A magnesium-aluminum-based and alloy technology, applied in the field of magnesium-aluminum-based alloy and its preparation, can solve the problems of weak bonding force between coating and substrate, complicated processing technology, poor wear resistance of coating, etc. Simple, corrosion-resistant effect

Active Publication Date: 2012-09-19
CITIC DICASTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, the cost is higher, and the coating cannot be repaired
[0006] Third, the product specifications are strict, the processing technology is complicated, and the quality control is difficult
[0007] Fourth, the wear resistance of the coating is poor, and the bonding force between the coating and the substrate is weak

Method used

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  • Anti-corrosion magnalium base alloy and preparation method thereof
  • Anti-corrosion magnalium base alloy and preparation method thereof
  • Anti-corrosion magnalium base alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 150g of Al, 15g of Mn, and 335g of Mg. The above-mentioned raw materials are all 99.5% pure metal powder, and the above-mentioned pure metal powder raw materials are pressed into a block with a diameter of 35 mm and a height of 10 mm. , plasma sintering for 5 min to obtain the alloy precursor. The above alloy precursor was wrapped with tantalum foil, melted and kept for 30 min at 10GPa, 1.1Tm (Tm: melting point), and then quickly solidified by blowing nitrogen gas. Then aging for 24 hours under 0.1Tm, the Mg-30Al-3Mn magnesium alloy with high strength and outstanding corrosion resistance can be obtained.

[0025] like figure 1 As shown, after soaking in 3.5 wt% NaCl solution, the corrosion resistance of the Mg-30Al-3Mn alloy obtained in this example is 10 times higher than that of magnesium alloys prepared by other traditional casting methods.

Embodiment 2

[0027] Take 5g of Al, 50g of Cd, and 445g of Mg. The above-mentioned raw materials are all 99.5% pure metal powder, and the above-mentioned pure metal powder raw materials are pressed into a block with a diameter of 25 mm and a height of 20 mm. The alloy precursor was obtained by plasma sintering for 10 min. The above alloy precursor was wrapped with tantalum foil, melted and kept for 30 min at 2 GPa, 1.1 Tm (Tm: melting point), and then quickly solidified by blowing nitrogen gas. Then aging for 2 hours under 0.2Tm, the Mg-1Al-10Cd magnesium alloy with high strength and outstanding corrosion resistance can be obtained.

[0028] like figure 1 As shown, after soaking in 3.5 wt% NaCl solution, the corrosion resistance of the Mg-1Al-10Cd alloy obtained in this example is 12 times higher than that of magnesium alloys prepared by other traditional casting methods.

[0029] like figure 2 As shown, compared with the Mg-1Al-10Cd alloy obtained in this example, the dendrite spacing ...

Embodiment 3

[0031] Take 100g of Al, 5g of Mn, 25g of Cd, and 370g of Mg. The above raw materials are all 99.5% pure metal powder, and the above pure metal powder raw materials are pressed into a block with a diameter of 30 mm and a height of 15 mm. The alloy precursor was obtained by plasma sintering under MPa pressure for 8 min. The above alloy precursor was wrapped with tantalum foil, melted and kept for 30 min at 6 GPa, 1.1 Tm (Tm: melting point), and then quickly solidified by blowing nitrogen gas. Then aging for 14 hours at 0.2Tm, the Mg-20Al-1Mn-5Cd magnesium alloy with high strength and outstanding corrosion resistance can be obtained.

[0032] like figure 1 As shown, after soaking in 3.5 wt% NaCl solution, the corrosion resistance of the Mg-20Al-1Mn-5Cd alloy obtained in this example is 11 times higher than that of magnesium alloys prepared by other traditional casting methods.

[0033] like image 3 As shown, the Mg-20Al-1Mn-5Cd alloy obtained in this example is compared with ...

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Abstract

The invention relates to an anti-corrosion magnalium base alloy of which the chemical composition is Mg-xAl-yMn-zCd, wherein x, y and z are mass fractions, x is 1-30%, y is 0-3%, and z is 0-10%. The preparation method comprises the steps that primary metal powder is pressed into blocks, plasma sintering is carried out for 5-10 minutes at the temperature of 400-520 DEG C and the pressure of 30MPa to obtain an alloy precursor; the alloy precursor is wrapped with tantalum foil and is fused at 2-10GPa and 1.1Tm (Tm is melting point), temperature is preserved for 30 minutes, and then nitrogen is blown for rapid solidification; and then at 0.1-0.2Tm, an magnesium alloy with high strength and outstanding corrosion resistance is obtained after 2-24 hours of aging. The magnalium base alloy and the preparation method thereof provided by the invention have the advantages that the process is simple, the cost is low, the corrosion resistance of the magnalium base alloy is improved by 10-12 times, the problem of surface layer destruction does not exist, and the application scope of the alloy is wider.

Description

technical field [0001] The invention relates to a metal material and a preparation method thereof, in particular to a magnesium-aluminum base alloy and a preparation method thereof. Background technique [0002] Magnesium is the most active metal in engineering applications. Its standard electrode potential is negative compared to iron, aluminum, zinc, copper and other metals, and it is easy to oxidize in oxygen-containing media to form magnesium oxide or magnesium hydroxide. At the same time, due to the characteristics of magnesium oxidation products, that is, the surface oxide film enriched on the surface is generally loose and porous, with low corrosion resistance, and cannot completely isolate the corrosive medium and the matrix, so that the corrosive medium penetrates the oxide layer, resulting in the gradual complete corrosion of the alloy. In addition, magnesium alloys will suffer from electrochemical corrosion in humid air or aqueous solution, which will reduce the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/04C22C1/02C22F1/06
Inventor 彭秋明李慧赵双双
Owner CITIC DICASTAL
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