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A kind of corrosion-resistant high-strength plastic magnesium alloy and preparation method thereof

A magnesium alloy, high-strength technology, applied in the field of corrosion-resistant high-strength plastic magnesium alloy and its preparation, can solve the problems of damage to the mechanical properties of the alloy, difficult to eliminate, stress concentration, etc., to improve plastic deformation ability, inhibit local corrosion, and reduce stress concentration Effect

Active Publication Date: 2022-06-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method depends on the segregation effect caused by the interaction between alloying elements, so it is only suitable for low alloy content magnesium alloys, and the alloy composition is limited to zinc, calcium and strontium, and the added rare earth elements are limited to gadolinium, erbium and praseodymium
In summary, in the medium and high alloy content magnesium-aluminum-tin-calcium-manganese alloy system, the technology of adding trace rare earth elements to improve corrosion resistance has not been reported
[0004] In addition, the corrosion resistance of magnesium alloys is usually incompatible with mechanical properties such as strength
Moreover, the second phase in the magnesium-aluminum-tin-calcium-manganese alloy has high density, large size, and irregular shape, which is difficult to eliminate by conventional solution treatment, and is prone to stress concentration in the subsequent deformation process, which greatly damages the alloy. mechanical properties

Method used

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  • A kind of corrosion-resistant high-strength plastic magnesium alloy and preparation method thereof
  • A kind of corrosion-resistant high-strength plastic magnesium alloy and preparation method thereof
  • A kind of corrosion-resistant high-strength plastic magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take the Mg-4.5Al-1.5Sn-0.5Ca-0.02Mn-0.05Ce alloy as an example (according to the composition mass percentage: Al: 4.5%, Sn: 1.5%, Ca: 0.5%, Mn: 0.02%, Ce: 0.05% %, inevitable impurities≤0.02%, the balance is magnesium, and its preparation method is as follows:

[0029] (1) Under the protection of argon, according to the above composition ratio, mix commercial pure Mg, commercial pure Al, commercial pure Sn, Mg-25Ca master alloy, Mg-2Mn master alloy and Mg-30Ce master alloy at 600-680 Melt at ℃, stir at 650-680℃ for 5min and keep for 5min to obtain a magnesium alloy melt with uniform composition, cast the magnesium alloy melt into a copper water-cooled mold, the water cooling temperature is 20℃, and the solidification cooling rate is 300K / s, to obtain a sub-rapid solidification as-cast magnesium alloy slab with a slab thickness of 4 mm;

[0030] (2) Pre-rolling the sub-rapid solidification as-cast magnesium alloy slab obtained in step (1), the reduction amount of the ...

Embodiment 2

[0035]Take Mg-4.5Al-1.5Sn-0.5Ca-0.02Mn-0.05Sm alloy as an example (according to the composition mass percentage: Al: 4.5%, Sn: 1.5%, Ca: 0.5%, Mn: 0.02%, Sm: 0.05 %, inevitable impurities≤0.02%, the balance is magnesium, and its preparation method is as follows:

[0036] (1) Under the protection of argon gas, according to the above composition ratio, mix commercial pure Mg, commercial pure Al, commercial pure Sn, Mg-25Ca master alloy, Mg-2Mn master alloy and Mg-35Sm master alloy at 680-710 Melt at ℃, then stir at 660-700℃ for 10min and keep for 30min to obtain a magnesium alloy melt with uniform composition, cast the magnesium alloy melt into a copper water-cooled mold, the water cooling temperature is 40℃, and the solidification cooling rate is 100K / s, to obtain a sub-rapid solidification as-cast magnesium alloy slab with a slab thickness of 10 mm;

[0037] (2) pre-rolling the sub-rapid solidification as-cast magnesium alloy slab obtained in step (1), the reduction amount o...

Embodiment 3

[0042] Take Mg-4.5Al-1.5Sn-0.5Ca-0.02Mn-0.025Ce-0.025Sm alloy as an example (according to the composition mass percentage: Al: 4.5%, Sn: 1.5%, Ca: 0.5%, Mn: 0.02%, Ce: 0.025%, Sm: 0.025%, unavoidable impurities≤0.02%, the balance is magnesium), and its preparation method is as follows:

[0043] (1) Under the protection of argon, according to the above composition ratio, commercial pure Mg, commercial pure Al, commercial pure Sn, Mg-25Ca master alloy, Mg-2Mn master alloy, Mg-30Ce master alloy and Mg-35Sm intermediate The alloy is mixed and melted at 600-680 ℃, and then stirred at 650-660 ℃ for 5 minutes and kept for 10 minutes to obtain a magnesium alloy melt with uniform composition. The solidification cooling rate is 164K / s, and the sub-rapid solidification as-cast magnesium alloy slab is obtained, and the slab thickness is 6mm;

[0044] (2) pre-rolling the sub-rapid solidification as-cast magnesium alloy slab obtained in step (1), the pre-rolling reduction is 4%, the rollin...

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Abstract

The invention provides a corrosion-resistant high-strength plastic magnesium alloy and a preparation method thereof. The magnesium alloy is composed of the following components according to the mass percentage of the components: 4-6% of aluminum, 1-3% of tin, and 0.1% of calcium ‑2%, manganese 0.01‑0.5%, rare earth 0.01‑0.2%, unavoidable impurities ≤ 0.02%, and the balance magnesium. The magnesium alloy preparation method includes five steps of sub-rapid solidification, pre-rolling, gradient solid solution, cross-rolling and stress relief annealing. Compared with the conventional magnesium alloy, the invention improves the stability and compactness of the corrosion product film by adding trace amounts of rare earth elements cerium and samarium, hinders the erosion of chloride ions on the alloy surface, suppresses localized corrosion, and improves the corrosion resistance of the alloy. In addition, the preparation method of the present invention can effectively control the size and distribution of the second phase in the magnesium alloy, and refine the crystal grains, thereby successfully preparing a corrosion-resistant high-strength plastic magnesium alloy.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a corrosion-resistant high-strength plastic magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium-aluminum-tin-calcium-manganese alloy has good room temperature strength, high temperature thermal stability and good creep resistance, and the reserves of aluminum, tin, calcium and other alloying elements are abundant, low price, and have good commercial applications prospect. However, in the process of solidification of magnesium-aluminum-tin-calcium-manganese alloy, magnesium easily reacts with elements such as aluminum, tin, and calcium to form a coarse second phase with high melting point (such as CaMgSn phase, Mg 2 (Al,Ca) phase and Al 2 Ca is equal). There is a large potential difference between these second phases and the alloy matrix, which easily leads to severe galvanic corrosion, which greatly damages the corrosion resistance of magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C23/02C22C1/03C22F1/06
Inventor 查敏梁家玮王慧远王大为贾海龙杨治政高丹
Owner JILIN UNIV
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