CN116121611A - High-corrosion-resistance high-strength and high-toughness Mg-Zn-Sc-Al magnesium alloy and preparation method thereof - Google Patents
High-corrosion-resistance high-strength and high-toughness Mg-Zn-Sc-Al magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high corrosion resistance and high strength and toughness Mg-Zn-Sc-Al magnesium alloy and a preparation method thereof, belonging to the technical field of magnesium alloy material preparation. The Mg-Zn-Sc-Al magnesium alloy is prepared by smelting, purifying, controlling the addition types and the addition amounts of elements, changing the heat treatment process and the like, so that the aim of improving the performance of the existing magnesium alloy is fulfilled. The hydrogen evolution rate of the Mg-Zn-Sc-Al magnesium alloy obtained by the method can reach 0.065-0.485 mm/y, and compared with pure magnesium with the hydrogen evolution rate of 11.6mm/y, the corrosion resistance is improved by 2 orders of magnitude; the Mg-Zn-Sc-Al magnesium alloy obtained by the method has the tensile strength of 200-302 MPa, the yield strength of 144-172 MPa and the elongation of 18-26 percent respectively.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy material preparation, and relates to a high-corrosion-resistance high-toughness Mg-Zn-Sc-Al magnesium alloy and a preparation method thereof.
Background
The magnesium alloy as the lightest metal structural material has the advantages of low density, high specific strength, high specific rigidity, good damping shock absorption, good heat conductivity, good electromagnetic shielding effect, good machining performance, stable size of parts, easy recovery and the like, has great potential in industry, but becomes a main obstacle for preventing large-scale application due to the defects of poor mechanical property and corrosion resistance at room temperature.
In the prior art, a second phase is generally introduced into the magnesium alloy in an alloying mode to improve the mechanical property of the magnesium alloy, but when the mechanical property of the magnesium alloy is improved, the corrosion resistance of the magnesium alloy tends to be reduced. This is the contradiction between the development of magnesium alloy in the current industrial application. The superfine crystal nanocrystallization process achieved through surface friction treatment can simultaneously improve the mechanical property and corrosion property of the magnesium alloy, but the process is complex, the cost is extremely high, and the process is not suitable for the production of large-scale devices, so that the process is difficult to apply on a large scale.
Therefore, a preparation method for preparing the magnesium alloy with simple preparation process and high corrosion resistance and mechanical property is urgently needed at present.
Disclosure of Invention
In view of the above, one of the objects of the present invention is to provide a Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high toughness; the second purpose of the invention is to provide a preparation method of the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness.
In order to achieve the above purpose, the present invention provides the following technical solutions:
1. the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness comprises the following components in percentage by weight: zn:0.5 to 2.0wt.%, sc:0.05 to 1.0wt.%, al:0.01 to 10.0wt percent, less than or equal to 0.05wt percent of unavoidable impurities and the balance of Mg.
Preferably, the average hydrogen evolution rate of the Mg-Zn-Sc-Al magnesium alloy soaked in a NaCl solution with the concentration of 3.5wt.% for 14 days is 0.485-0.065 mm/y, the tensile strength of the Mg-Zn-Sc-Al magnesium alloy is 200-302 MPa, the yield strength is 144-172 MPa, and the elongation is 18-26%.
2. The preparation method of the Mg-Zn-Sc-Al magnesium alloy comprises the following steps:
(1) Smelting: heating and melting metallic magnesium under protective gas, adding metallic scandium, heating to completely melt, sequentially adding metallic zinc and metallic aluminum after uniformly mixing, continuously heating to completely melt, uniformly mixing, heating to 750-800 ℃ after removing bottom precipitate infusions, preserving heat for 10-20 min, and removing surface scum to obtain pure magnesium alloy melt;
(2) And (3) solidification: placing the magnesium alloy melt in the step (1) into tap water at the temperature of 10-40 ℃ for cooling to obtain a magnesium alloy cast ingot;
(3) Machining: machining the magnesium alloy cast ingot in the step (2), removing irregular parts and defective parts from the upper part and the lower part, and taking a high magnesium alloy cast ingot with the middle part of 60mm for later use;
(4) Solution treatment: carrying out solution treatment on the magnesium alloy cast ingot subjected to the machining treatment in the step (3) at the temperature of 350-450 ℃;
(5) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) for 3-5 hours at 350-450 ℃, performing hot extrusion and air cooling to obtain an extruded plate, namely the high-corrosion-resistance high-toughness Mg-Zn-Sc-Al magnesium alloy.
Preferably, the magnesium metal in step (1) is an industrially pure magnesium ingot having a purity of 99.97wt.% or more; the metal zinc is pure zinc particles, and the purity of the metal zinc is more than or equal to 99.99wt.%; the scandium metal is Mg-4Sc intermediate alloy; the metal aluminum is a pure aluminum sheet, and the purity of the metal aluminum is more than or equal to 99.99 wt%.
Preferably, the steps ofThe shielding gas in the step (1) is CO 2 Gas and SF 6 Mixing other gases; CO in the mixed gas 2 Gas and SF 6 The volume ratio of the gases was 99:1.
Preferably, the heating temperature in step (1) is 750 to 800 ℃.
Preferably, the temperature of the solution treatment in the step (4) is 350 to 450 ℃ and the time is 20 to 30 hours.
Preferably, the extrusion ratio of the hot extrusion in step (5) is 25: 1-30:1.
The invention has the beneficial effects that:
1. the invention discloses a high corrosion resistance and high strength and toughness Mg-Zn-Sc-Al magnesium alloy, which comprises the following components in percentage by weight: zn:0.5 to 2.0wt.%, sc:0.05 to 1.0wt.%, al:0.01 to 10.0wt percent, less than or equal to 0.05wt percent of unavoidable impurities and the balance of Mg. The Mg-Zn-Sc-Al magnesium alloy has obviously improved performance, and is specifically expressed as follows: (1) The average hydrogen evolution rate of the magnesium alloy is 0.065-0.485 mm/y after being soaked in 3.5wt.% NaCl solution for 14 days, and the corrosion resistance is improved by 2 orders of magnitude compared with the industrial pure magnesium with the hydrogen evolution rate of 11.6 mm/y; (2) The tensile strength is 200-302 MPa, the yield strength is 144-172 MPa, the elongation is 18-26%, the Yu Chunmei alloy is obviously high, and the tensile strength, the yield strength and the elongation are respectively improved by 108MPa, 144MPa and 16%. The main reason for improving the performance of the Mg-Zn-Sc-Al magnesium alloy is as follows: (1) The addition of Zn element in pure magnesium can make the formed corrosion product film smoother, and the addition of Sc element and Al element can make the magnesium alloy form a film with ScO and Al (OH) 3 The corrosion product layer of the etching solution can well fill the corrosion pit; (2) The coordination effect caused by the simultaneous addition of Zn, sc and Al can lead the magnesium alloy to have better corrosion resistance, the Sc element, the Zn element and the Al element have larger solid solubility in pure magnesium, the second phase is not easy to form with magnesium, the single-phase magnesium alloy can be formed after solution treatment, and the corrosion resistance of the single-phase magnesium alloy is better; (3) Besides, the Mg-Zn-Sc-Al magnesium alloy also has higher strength, on one hand, zn, sc and Al elements have higher solid solubility in pure magnesium, and the Mg-Zn-Sc-Al elements have higher solid solubility in the pure magnesiumThe magnesium base is subjected to solid solution treatment to perform a solid solution strengthening function, and on the other hand, the extruded magnesium alloy can generate a work hardening effect to enable the magnesium alloy to have higher strength.
2. The invention discloses a preparation method of a high corrosion resistance and high toughness Mg-Zn-Sc-Al magnesium alloy, which improves the performance of the existing magnesium alloy mainly by smelting, purifying, controlling the addition types and the content of elements, changing the heat treatment process, and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a scanning electron microscope image of the microstructure of the Mg-Zn-Sc-Al magnesium alloy prepared in example 4;
FIG. 2 shows the hydrogen evolution test results of the Mg-Zn-Sc-Al magnesium alloys prepared in example 1, example 2, example 3, example 4 and the magnesium alloy prepared in comparative example 1 immersed in a 3.5wt.% NaCl solution for 14 days.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Example 1
The preparation method of the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness comprises the following steps:
(1) Firstly, according to Zn:1.6wt.%, sc:0.07wt.% Al: preparing corresponding raw materials by weight percentage of 0.01wt.% and less than or equal to 0.05wt.% of unavoidable impurities and the balance of Mg, wherein zinc is derived from pure zinc with purity of more than or equal to 99.99wt.%, magnesium is derived from industrial pure magnesium ingot with purity of more than or equal to 99.97wt.% and Mg-4Sc master alloy, scandium is derived from Mg-4Sc master alloy, and aluminum is derived from pure aluminum with purity of more than 99.99wt.%;
(2) Smelting: placing raw material Mg (pure magnesium ingot) into a resistance furnace crucible, continuously introducing protective gas, heating to completely melt the Mg, adding raw material Sc (Mg-4 Sc intermediate alloy), heating to completely melt, stirring and mixing uniformly, sequentially adding raw material Zn (pure zinc particles) and raw material Al (pure aluminum sheets), heating to completely melt, stirring and mixing uniformly, heating to 750 ℃ after removing bottom precipitate infusions, preserving heat for 20min, and removing scum on the surface to obtain pure magnesium alloy melt;
(3) And (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) into tap water at 10 ℃ for cooling to obtain a magnesium alloy cast ingot;
(4) Machining: machining the cast ingot in the step (2), removing the irregular parts and the defective parts, and taking a cast ingot of the high magnesium alloy with the middle part of 60mm for later use;
(5) Solution treatment: carrying out solution treatment on the cast ingot subjected to the machining treatment in the step (3) at 350 ℃;
(6) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) for 5 hours at 350 ℃, and performing air cooling after hot extrusion to obtain an extruded plate, namely the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness.
Example 2
The preparation method of the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness comprises the following steps:
(2) Firstly, according to Zn:2.0wt.%, sc:1.0wt.% Al:4.03wt.% of unavoidable impurities of 0.05wt.% or less, the balance Mg being weight percent, preparing a corresponding feedstock, wherein zinc is derived from pure zinc particles having a purity of 99.99wt.% or more, magnesium is derived from industrial pure magnesium ingots having a purity of 99.97wt.% or more and Mg-4Sc master alloy, scandium is derived from Mg-4Sc master alloy, and aluminum is derived from pure aluminum flakes having a purity of 99.99wt.% or more;
(2) Smelting: putting raw material Mg (pure magnesium ingot) into a resistance furnace crucible, continuously introducing protective gas, heating to completely melt the Mg, adding raw material Sc (Mg-4 Sc intermediate alloy), heating to completely melt, stirring and mixing uniformly, sequentially adding raw material Zn (pure zinc particles) and raw material Al (pure aluminum sheets), heating to completely melt, stirring and mixing uniformly, removing bottom precipitate infusible matter, keeping the temperature for 10min when the temperature rises to 800 ℃, and removing scum on the surface. Obtaining pure magnesium alloy melt;
(3) And (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) into tap water at 40 ℃ for cooling to obtain a magnesium alloy cast ingot;
(4) Machining: machining the cast ingot in the step (2), removing the irregular parts and the defective parts, and taking a cast ingot of the high magnesium alloy with the middle part of 60mm for later use;
(5) Solution treatment: carrying out solution treatment on the cast ingot subjected to the machining treatment in the step (3) at the temperature of 450 ℃;
(6) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) for 3 hours at 450 ℃, and performing air cooling after hot extrusion to obtain an extruded plate, namely the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness.
Example 3
The preparation method of the high corrosion resistance high strength and toughness Mg-Zn-Sc-Al magnesium alloy is as follows:
(3) Firstly, according to Zn:0.5wt.%, sc:0.05wt.% Al: preparing corresponding raw materials by weight percentage of 10wt.% of unavoidable impurities less than or equal to 0.05wt.% and the balance of Mg, wherein zinc is derived from pure zinc particles with purity of more than or equal to 99.99wt.%, magnesium is derived from industrial pure magnesium ingots with purity of more than or equal to 99.97wt.% and Mg-4Sc master alloy, scandium is derived from Mg-4Sc master alloy, and aluminum is derived from pure aluminum sheets with purity of more than 99.99wt.%;
(2) Smelting: putting raw material Mg (pure magnesium ingot) into a resistance furnace crucible, continuously introducing protective gas, heating to completely melt the Mg, adding raw material Sc (Mg-4 Sc intermediate alloy), heating to completely melt, stirring and mixing uniformly, sequentially adding raw material Zn (pure zinc) and raw material Al, heating to completely melt, stirring and mixing uniformly, removing bottom precipitate infusible matter, keeping the temperature for 15min when the temperature rises to 780 ℃, and removing scum on the surface. Obtaining pure magnesium alloy melt;
(3) And (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) into tap water at 30 ℃ for cooling to obtain a magnesium alloy cast ingot;
(4) Machining: machining the cast ingot in the step (2), removing the irregular parts and the defective parts, and taking a cast ingot of the high magnesium alloy with the middle part of 60mm for later use;
(5) Solution treatment: carrying out solution treatment on the cast ingot subjected to the machining treatment in the step (3) at 400 ℃;
(6) Hot extrusion molding: preheating the ingot after solution treatment in the step (4) for 4 hours at 450 ℃, hot extruding and air cooling to obtain an extruded plate, namely the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness.
Example 4
The preparation method of the high corrosion resistance high strength and toughness Mg-Zn-Sc-Al magnesium alloy is as follows:
(1) Firstly, according to Zn:1.59wt.%, sc:0.11wt.% Al:6.48wt.% of unavoidable impurities of 0.05wt.% or less, the balance Mg being weight percent, preparing a corresponding feedstock, wherein zinc is derived from pure zinc particles having a purity of 99.99wt.% or more, magnesium is derived from industrial pure magnesium ingots having a purity of 99.97wt.% or more and Mg-4Sc master alloy, scandium is derived from Mg-4Sc master alloy, and aluminum is derived from pure aluminum flakes having a purity of 99.99wt.% or more;
(2) Smelting: putting raw material Mg (pure magnesium ingot) into a resistance furnace crucible, continuously introducing protective gas, heating to completely melt the Mg, adding raw material Sc (Mg-4 Sc intermediate alloy), heating to completely melt, stirring and mixing uniformly, sequentially adding raw material Zn (pure zinc particles) and raw material Al (pure aluminum sheets), heating to completely melt, stirring and mixing uniformly, removing bottom precipitate infusible matters, keeping the temperature for 20min when the temperature rises to 750 ℃, and removing surface scum. Obtaining pure magnesium alloy melt;
(3) And (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) into tap water at 20 ℃ for cooling to obtain a magnesium alloy cast ingot;
(4) Machining: machining the cast ingot in the step (2), removing the irregular parts and the defective parts, and taking a cast ingot of the high magnesium alloy with the middle part of 60mm for later use;
(5) Solution treatment: carrying out solution treatment on the cast ingot subjected to the machining treatment in the step (3) at 400 ℃;
(6) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) for 3 hours at 400 ℃, and performing air cooling after hot extrusion to obtain an extruded plate, namely the Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness.
Comparative example 1
The preparation method of the pure magnesium board is as follows:
(1) Preparing a sufficient amount of industrial pure magnesium (from an industrial magnesium ingot having a purity of 99.97wt.% or more);
(2) Smelting: and (3) putting the raw material Mg into a resistance furnace crucible, continuously introducing protective gas, heating to completely melt the Mg, keeping the temperature for 20min when the temperature rises to 700 ℃, and removing scum on the surface. Obtaining pure magnesium melt;
(3) And (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) into tap water at 20 ℃ for cooling to obtain a magnesium alloy cast ingot;
(4) Machining: machining the cast ingot in the step (2), removing irregular parts and defective parts from the upper part and the lower part, and taking a high-purity magnesium cast ingot with the middle part of 60mm for later use;
(5) Solution treatment: carrying out solution treatment on the cast ingot subjected to the machining treatment in the step (3) at 400 ℃;
(6) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) at 400 ℃ for 5 hours, hot extruding, and air cooling to obtain an extruded plate, thus obtaining a pure magnesium sample.
And (3) performance detection:
1. and (3) microstructure detection:
FIG. 1 is a scanning electron microscope image of the microstructure of the Mg-Zn-Sc-Al magnesium alloy prepared in example 4, from which it can be seen, the Mg-Zn-Sc-Al magnesium alloy prepared in example 4 hardly observed a distinct second phase and was a uniform single-phase structure.
2. Hydrogen evolution test:
the Mg-Zn-Sc-Al magnesium alloys prepared in example 1, example 2, example 3, example 4 and the magnesium alloy prepared in comparative example 1 were each subjected to a hydrogen evolution test in a 3.5wt.% NaCl solution for 14 days, and the results are shown in fig. 2. As can be seen from FIG. 2, the high corrosion resistance and high toughness Mg-Zn-Sc-Al magnesium alloy prepared in examples 1-4 of the invention has obviously lower hydrogen evolution rate than pure magnesium in comparative example 1, and the corrosion resistance is improved by about 2 orders of magnitude. The hydrogen evolution rate of the high corrosion resistance high strength and toughness Mg-Zn-Sc-Al magnesium alloy prepared in the embodiment 4 of the invention can be as low as 0.065mm/y.
3. Mechanical property test
The Mg-Zn-Sc-Al magnesium alloys prepared in example 1, example 2, example 3, example 4 and the magnesium alloy prepared in comparative example 1 were subjected to tensile test, and the results are shown in table 1. As can be seen from Table 1, the high corrosion resistance and high toughness Mg-Zn-Sc-Al magnesium alloy prepared in example 4 of the invention has significantly higher yield strength, tensile strength and elongation than those of pure magnesium in comparative example 1, and the yield strength, tensile strength and elongation are respectively improved by 108MPa, 144MPa and 16%. The Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness prepared in the embodiment 1-4 has the tensile strength of 200-302 MPa, the yield strength of 144-172 MPa and the elongation of 18-26 percent respectively.
TABLE 1 tensile test and Hydrogen evolution test results for different magnesium alloys
| Alloy | Hydrogen evolution corrosion rate (mm/y) | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) |
| Example 1 | 0.376 | 144 | 200 | 18 |
| Example 2 | 0.485 | 146 | 203 | 19 |
| Example 3 | 0.139 | 150 | 255 | 24 |
| Example 4 | 0.065 | 172 | 302 | 26 |
| Comparative example 1 | 11.6 | 64 | 158 | 10 |
In summary, the invention discloses a high corrosion resistance and high toughness Mg-Zn-Sc-Al magnesium alloy and a preparation method thereof, wherein the Mg-Zn-Sc-Al magnesium alloy is prepared by smelting, purifying, controlling the addition types and the addition amounts of elements, changing the heat treatment process and other modes, so as to achieve the aim of improving the performance of the existing magnesium alloy. The hydrogen evolution rate of the Mg-Zn-Sc-Al magnesium alloy obtained by the method can reach 0.065-0.485 mm/y, and compared with pure magnesium with the hydrogen evolution rate of 11.6mm/y, the corrosion resistance is improved by 2 orders of magnitude; the Mg-Zn-Sc-Al magnesium alloy obtained by the method has the tensile strength of 200-302 MPa, the yield strength of 144-172 MPa and the elongation of 18-26 percent respectively. The reason for improving the performance of the Mg-Zn-Sc-Al magnesium alloy prepared by the invention is that: (1) The addition of Zn element in pure magnesium can make the formed corrosion product film smoother, and the addition of Sc element and Al element can make the magnesium alloy form a film with ScO and Al (OH) 3 The corrosion product layer of the etching solution can well fill the corrosion pit; (2) The simultaneous addition and mutual coordination of Zn, sc and Al can lead the magnesium alloy to have better corrosion resistance, the Sc element, the Zn element and the Al element have larger solid solubility in pure magnesium, the second phase is not easy to form with magnesium, the single-phase magnesium alloy can be formed after the solution treatment, and the single-phase magnesium alloy has better corrosion resistance; (3) In addition, the Mg-Zn-Sc-Al magnesium alloy also has higher strength, and on one hand, the extruded magnesium alloy can generate a work hardening effect so as to have higher strength. On the other hand, the Zn, sc and Al elements have higher solid solubility in pure magnesium, and play a role in solid solution strengthening on the magnesium matrix after solution treatment.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (8)
1. The Mg-Zn-Sc-Al magnesium alloy with high corrosion resistance and high strength and toughness is characterized by comprising the following components in percentage by weight: zn:0.5 to 2.0wt.%, sc:0.05 to 1.0wt.%, al:0.01 to 10.0wt percent, less than or equal to 0.05wt percent of unavoidable impurities and the balance of Mg.
2. The magnesium alloy according to claim 1, wherein the Mg-Zn-Sc-Al magnesium alloy has an average hydrogen evolution rate of 0.485-0.065 mm/y after being immersed in a 3.5wt.% NaCl solution for 14 days, and the Mg-Zn-Sc-Al magnesium alloy has a tensile strength of 200-302 MPa, a yield strength of 144-172 MPa, and an elongation of 18-26%.
3. The method for preparing the Mg-Zn-Sc-Al magnesium alloy according to any one of claims 1 to 2, characterized by comprising the steps of:
(1) Smelting: heating and melting metallic magnesium under protective gas, adding metallic scandium, heating to completely melt, sequentially adding metallic zinc and metallic aluminum after uniformly mixing, continuously heating to completely melt, uniformly mixing, heating to 750-800 ℃ after removing bottom precipitate infusions, preserving heat for 10-20 min, and removing surface scum to obtain pure magnesium alloy melt;
(2) And (3) solidification: placing the magnesium alloy melt in the step (1) into tap water at the temperature of 10-40 ℃ for cooling to obtain a magnesium alloy cast ingot;
(3) Machining: machining the magnesium alloy cast ingot in the step (2), removing irregular parts and defective parts from the upper part and the lower part, and taking a high magnesium alloy cast ingot with the middle part of 60mm for later use;
(4) Solution treatment: carrying out solution treatment on the magnesium alloy cast ingot subjected to the machining treatment in the step (3) at the temperature of 350-450 ℃;
(5) Hot extrusion molding: preheating the ingot subjected to solution treatment in the step (4) for 3-5 hours at 350-450 ℃, performing hot extrusion and air cooling to obtain an extruded plate, namely the high-corrosion-resistance high-toughness Mg-Zn-Sc-Al magnesium alloy.
4. The method according to claim 3, wherein the metal magnesium in the step (1) is an industrially pure magnesium ingot having a purity of 99.97wt.% or more; the metal zinc is pure zinc particles, and the purity of the metal zinc is more than or equal to 99.99wt.%; the scandium metal is Mg-4Sc intermediate alloy; the metal aluminum is a pure aluminum sheet, and the purity of the metal aluminum is more than or equal to 99.99 wt%.
5. The method according to claim 3, wherein the shielding gas in the step (1) is CO 2 Gas and SF 6 Mixing other gases; CO in the mixed gas 2 Gas and SF 6 The volume ratio of the gases was 99:1.
6. A method according to claim 3, wherein the heating in step (1) is carried out at a temperature of 750 to 800 ℃.
7. The method according to claim 3, wherein the temperature of the solution treatment in the step (4) is 350 to 450 ℃ for 20 to 30 hours.
8. A method according to claim 3, wherein the extrusion ratio of the hot extrusion in step (5) is 25: 1-30:1.
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| US20190112692A1 (en) * | 2016-06-02 | 2019-04-18 | Unist (Ulsan National Institute Of Science And Technology) | Magnesium alloy materials and method for producing the same |
| CN113234977A (en) * | 2021-05-10 | 2021-08-10 | 重庆大学 | High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof |
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