CN113234977A - High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof - Google Patents
High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 45
- 238000005260 corrosion Methods 0.000 claims abstract description 45
- 239000011777 magnesium Substances 0.000 claims abstract description 37
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- 239000011701 zinc Substances 0.000 claims description 29
- 239000000243 solution Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 23
- 239000002994 raw material Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000001192 hot extrusion Methods 0.000 claims description 17
- 238000003754 machining Methods 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 239000001257 hydrogen Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/06—Making sheets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The invention relates to a high-corrosion-resistance Mg-Zn-Sc magnesium alloy and a preparation method thereof, belonging to the technical field of magnesium alloy material preparation. The performance of the existing magnesium alloy is improved by adding alloy elements, purifying, changing a processing technology, carrying out surface treatment and the like, the effect of refining grains can be achieved by adding Zn element and Sc element into pure magnesium, and the finer the grains, the more uniform the galvanic corrosion is, the better the corrosion resistance of the magnesium alloy is. The Sc element and the Zn element both have higher solid solubility in pure magnesium, are not easy to form a second phase with magnesium, can completely form a single-phase magnesium alloy after solution treatment, and have better corrosion resistance; meanwhile, Zn element and Sc element are added, so that a compact corrosion product film can be generated on the metal surface, and the corrosion resistance of the alloy is improved.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy material preparation, and relates to a high-corrosion-resistance Mg-Zn-Sc magnesium alloy and a preparation method thereof.
Background
The magnesium alloy belongs to the lightest metal structure material, is known as a green engineering material in the 21 st century, has the advantages of low density, high specific strength, high specific rigidity, good damping and shock absorption, good thermal conductivity, good electromagnetic shielding effect, excellent machining performance, stable and easily-recycled part size and the like, and has a history for many years in the application of industries such as aviation, aerospace, automobiles, computers, electronics, communication, household appliances and the like. In recent years, interest in magnesium materials is aroused in the aspects of light weight requirements of automobiles, continuous improvement of environmental requirements, gradual shortage of energy and the like, but the poor corrosion resistance limits related application and development prospects to a great extent.
From the thermodynamics, magnesium and magnesium alloy are more active, the electrode potential is very low, galvanic corrosion is easy to generate in practical use and is preferentially corroded as an anode; meanwhile, MgO or Mg (OH) on the surface of the magnesium alloy2The oxide film is sparse and does not prevent further oxidation of Mg well. Therefore, due to the characteristics of the magnesium alloy, the service performance of the magnesium alloy in a humid environment is poor.
In order to improve the corrosion resistance of magnesium alloys, methods such as adding alloy elements, purifying, changing the processing technology, and performing surface treatment are generally used. The microalloying is used as a simple and effective mode, not only can improve the corrosion resistance of the magnesium alloy, but also has good effect on improving the mechanical property of the magnesium alloy, and the microalloying can improve the microstructure of the magnesium alloy, such as refining grains, improving the components and structure of a second phase, generating more stable metal oxide, forming a more compact corrosion product film and the like, and improving the corrosion resistance of the magnesium alloy.
One highly corrosive magnesium alloy that can be produced by microalloying is therefore a magnesium alloy, so as to enable the magnesium alloy to be used on a large scale.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a high corrosion resistance Mg-Zn-Sc magnesium alloy; the second purpose of the invention is to provide a preparation method of the Mg-Zn-Sc magnesium alloy with high corrosion resistance.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a high-corrosion-resistance Mg-Zn-Sc magnesium alloy comprises the following components in percentage by weight: zn: 0.8-1.2 wt%, Sc: 0.1 to 1.2 wt%, unavoidable impurities of 0.02 wt% or less, and the balance being Mg.
Preferably, the hydrogen rate of the magnesium alloy precipitation is 0.0166-0.0063 ml/cm2H, corrosion current of said magnesium alloy is 4.084 × 10–11～1.883×10–5A cm-2。
2. The preparation method of the high-corrosion-resistance Mg-Zn-Sc magnesium alloy comprises the following steps:
(1) smelting: putting raw material Mg into a crucible of a resistance furnace, continuously introducing protective gas, heating to completely melt the Mg, sequentially adding raw material Zn and raw material Sc, heating to completely melt, stirring and mixing uniformly, keeping the temperature for 10-20 min when the temperature rises to 700-740 ℃, removing floating slag on the surface, and obtaining pure magnesium alloy melt;
(2) and (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) in 50-60 ℃ saline water for cooling to obtain a magnesium alloy ingot;
(3) machining: machining the cast ingot in the step (2) for later use;
(4) solution treatment: carrying out heat treatment on the cast ingot subjected to machining treatment in the step (3);
(5) hot extrusion molding: preheating the cast ingot subjected to the solution treatment in the step (4) at 390-410 ℃ for 1.5-2 h, and performing air cooling after hot extrusion to obtain an extruded plate;
(6) solution treatment: and (4) carrying out solid solution treatment on the extruded plate subjected to hot extrusion in the step (5) at 390-410 ℃ to obtain the high-corrosion-resistance Mg-Zn-Sc magnesium alloy.
Preferably, in the step (1), the raw material Mg is an industrial pure magnesium ingot (the purity is more than equal to 99.98 wt%), the raw material Zn is pure zinc (the purity is more than equal to 99.99 wt%), and the raw material Sc is Mg-2Sc master alloy.
Preferably, the protective gas in step (1) is CO2Gas and SF6The gases are mixed to form.
Preferably, CO in the protective gas in the step (1)2Gas and SF6The volume ratio of the gases was 1: 99.
Preferably, the heating temperature in the step (1) is 740-760 ℃; the stirring time is 3-5 min.
Preferably, the temperature of the solution treatment in the step (4) is 390-410 ℃, and the time of the solution treatment is 22-26 h.
Preferably, the extrusion ratio of the hot extrusion in the step (5) is 25: 1-30: 1.
The invention has the beneficial effects that:
the invention discloses a high-corrosion-resistance Mg-Zn-Sc magnesium alloy, which improves the performance of the existing magnesium alloy by adding alloy elements, purifying, changing the processing technology, performing surface treatment and the like, and the hydrogen evolution rate of the obtained magnesium alloy can reach 0.0166-0.0063 ml/cm2H, corrosion current reaches 4.084 × 10–11～1.883×10–5A cm-2And the hydrogen evolution rate is 0.0486ml/cm2H, corrosion current of 2.004X 10–5A cm-2Compared with Mg-Zn magnesium alloy, the Mg-Zn magnesium alloy is greatly improved, Zn element and Sc element are added into pure magnesium to achieve the effect of refining grains, the finer the grains, the more uniform the galvanic corrosion, and the better the corrosion resistance of the magnesium alloy. The Sc element and the Zn element both have higher solid solubility in pure magnesium, are not easy to form a second phase with magnesium, can completely form a single-phase magnesium alloy after solution treatment, and have better corrosion resistance; and meanwhile, Zn element and Sc element are added, so that a compact corrosion product film can be generated on the metal surface. Thereby improving the corrosion resistance of the alloy.
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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a photograph of corrosion products of the products prepared in example 1, example 2, example 3 and comparative example 1;
fig. 2 shows the results of hydrogen evolution tests of magnesium alloys prepared in example 1, example 2, example 3 and comparative example 1.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Example 1
The preparation method of the high-corrosion-resistance Mg-Zn-Sc magnesium alloy comprises the following steps:
(1) firstly, according to the Zn: 1.2 wt%, Sc: 0.1 wt%, unavoidable impurities less than or equal to 0.02 wt%, and the balance being Mg;
(2) smelting: putting raw material Mg (industrial pure magnesium ingot, purity more than or equal to 99.98 wt%) into a crucible of a resistance furnace, and continuously introducing protective gas (CO)2Gas and SF6Mixing gases in a volume ratio of 1: 99), heating to 740 ℃ to completely melt Mg, sequentially adding raw materials Zn (pure zinc particles, the purity of which is more than 99.99wt percent) and Sc (Mg-2Sc master alloy), heating to 740 ℃ to completely melt, stirring for 5min to mix uniformly, keeping the temperature for 120min when the temperature rises to 700 ℃, 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 (2) in 50 ℃ saline water for cooling to obtain a magnesium alloy ingot;
(4) machining: machining the cast ingot in the step (3) for later use;
(5) solution treatment: carrying out heat treatment on the ingot subjected to machining treatment in the step (4) (the treatment temperature is 390 ℃, and the treatment time is 26 h);
(6) hot extrusion molding: preheating the cast ingot subjected to the solution treatment in the step (5) at 390 ℃ for 2h, carrying out hot extrusion at an extrusion ratio of 30:1, and then carrying out air cooling to obtain an extruded plate;
(7) solution treatment: and (4) carrying out solid solution treatment on the extruded plate subjected to hot extrusion in the step (6) at 390 ℃ to obtain the high-corrosion-resistance Mg-Zn-Sc magnesium alloy.
Example 2
The preparation method of the high-corrosion-resistance Mg-Zn-Sc magnesium alloy comprises the following steps:
(1) firstly, according to the Zn: 0.8 wt%, Sc: 0.6 wt%, unavoidable impurities less than or equal to 0.02 wt%, and the balance being Mg;
(2) smelting: putting raw material Mg (industrial pure magnesium ingot, purity more than or equal to 99.98 wt%) into a crucible of a resistance furnace, and continuously introducing protective gas (CO)2Gas and SF6Mixing gases in a volume ratio of 1: 99), heating to 750 ℃ to completely melt Mg, sequentially adding raw materials Zn (pure zinc particles, the purity of which is more than or equal to 99.99 wt%) and Sc (Mg-2Sc master alloy), heating to 750 ℃ to completely melt, stirring for 4min to uniformly mix, keeping the temperature for 15min when the temperature rises to 720 ℃, and removing scum on the surface to obtain a pure magnesium alloy melt;
(3) and (3) solidification: placing the crucible containing the magnesium alloy melt in the step (2) in 50-6055 ℃ saline water for cooling to obtain a magnesium alloy ingot;
(4) machining: machining the cast ingot in the step (3) for later use;
(5) solution treatment: carrying out heat treatment on the ingot subjected to machining treatment in the step (4) (the treatment temperature is 400 ℃, and the treatment time is 24 hours);
(6) hot extrusion molding: preheating the cast ingot subjected to the solution treatment in the step (5) at 400 ℃ for 1.8h, carrying out hot extrusion at an extrusion ratio of 30:1, and then carrying out air cooling to obtain an extruded plate;
(7) solution treatment: and (4) carrying out solution treatment on the extruded plate subjected to hot extrusion in the step (6) at 400 ℃ to obtain the high-corrosion-resistance Mg-Zn-Sc magnesium alloy.
Example 3
The preparation method of the high-corrosion-resistance Mg-Zn-Sc magnesium alloy comprises the following steps:
(1) firstly, according to the Zn: 1.0 wt%, Sc: 1.2 wt%, unavoidable impurities less than or equal to 0.02 wt%, and the balance being Mg;
(2) smelting: putting raw material Mg (industrial pure magnesium ingot, purity more than or equal to 99.98 wt%) into a crucible of a resistance furnace, and continuously introducing protective gas (CO)2Gas and SF6Mixing gases in a volume ratio of 1: 99), heating to 760 ℃ to completely melt Mg, sequentially adding raw materials Zn (pure zinc particles, the purity of which is more than or equal to 99.99 wt%) and Sc (Mg-2Sc master alloy), heating to 760 ℃ to completely melt, stirring for 3min, uniformly mixing, keeping the temperature for 20min when the temperature rises to 700 ℃, and removing scum on the surface to obtain a pure magnesium alloy melt;
(3) and (3) solidification: placing the crucible containing the magnesium alloy melt in the step (2) in 60 ℃ saline water for cooling to obtain a magnesium alloy ingot;
(4) machining: machining the cast ingot in the step (3) for later use;
(5) solution treatment: carrying out heat treatment on the ingot subjected to machining treatment in the step (4) (the treatment temperature is 410 ℃, and the treatment time is 22 h);
(6) hot extrusion molding: preheating the cast ingot subjected to solution treatment in the step (5) at 410 ℃ for 1.5h, carrying out hot extrusion at an extrusion ratio of 30:1, and then carrying out air cooling to obtain an extruded plate;
(7) solution treatment: and (4) carrying out solution treatment on the extruded plate subjected to hot extrusion in the step (6) at 410 ℃ to obtain the high-corrosion-resistance Mg-Zn-Sc magnesium alloy.
Comparative example 1
The preparation was carried out in accordance with the preparation method of example 1, but with the addition of the raw material containing no Sc, to prepare a magnesium alloy in which the weight percentage of Zn was 1.5 wt%, unavoidable impurities were 0.02 wt% or less, and the balance Mg.
And (3) performance detection:
1. and (3) detecting the microstructure:
FIG. 1 is a photograph of corrosion products of the products prepared in example 1, example 2, example 3 and comparative example 1; the magnesium alloys prepared in examples 1 to 3 and comparative example 1 were immersed in a 3.5 wt.% NaCl solution for 24 hours for observation of microstructure by scanning electron microscopy, and the results are shown in fig. 1. The microstructure of the upper surface of the magnesium alloy material prepared by the method is subjected to a scanning electron microscope to find a corrosion product film with compact structure and uniform distribution. With the increase of Sc element, the corrosion product film becomes more and more compact, which effectively blocks Cl-Ions further permeate into the magnesium alloy matrix, so that the corrosion rate is reduced, and the corrosion resistance of the alloy is improved.
2. Hydrogen evolution test:
the magnesium alloys prepared in example 1, example 2, example 3 and comparative example 1 were subjected to a hydrogen evolution test, and the results are shown in table 1 and fig. 2. As can be seen from Table 1, the hydrogen evolution rate of the Mg-Zn-Sc magnesium alloy with high corrosion resistance prepared in the embodiments 1-3 of the invention is obviously lower than that of the Mg-Zn magnesium alloy prepared in the comparative embodiment 1, and is reduced by about 0.0423ml/cm2H. The hydrogen evolution rate of the Mg-Zn-Sc magnesium alloy with high corrosion resistance prepared by the invention can be as low as 0.0063ml/cm2*h。
3. Electrochemical testing
For the Mg-Zn-Sc magnesium alloy with high corrosion resistance prepared in examples 1-3 andthe Mg-Zn magnesium alloy prepared in comparative example 1 was subjected to electrochemical tests after soaking in a 3.5 wt.% NaCl solution for 24 hours, and the results are shown in table 1. As can be seen from Table 1, the corrosion resistance of the Mg-Zn-Sc magnesium alloy with high corrosion resistance prepared by the invention is obviously higher than that of the Mg-Zn magnesium alloy. The corrosion current of the Mg-Zn-Sc magnesium alloy with high corrosion resistance prepared by the invention is as low as 4.084 multiplied by 10–11A cm-2。
TABLE 1 electrochemical and Hydrogen evolution test results for different magnesium alloys
| Examples | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Corrosion current (A cm)-2) | 1.883×10–5 | 1.855×10–6 | 4.084×10–11 | 2.004×10–5 |
| Hydrogen evolution rate (ml/cm)2*h) | 0.0166 | 0.0085 | 0.0063 | 0.0486 |
In conclusion, the invention discloses a high-corrosion-resistance Mg-Zn-Sc magnesium alloy, which improves the performance of the existing magnesium alloy by adding alloy elements, purifying, changing the processing technology, performing surface treatment and the like, and the hydrogen evolution rate of the obtained magnesium alloy can reach 0.0166-0.0063 ml/cm2H, corrosion current reaches 4.084 × 10–11～1.883×10–5A cm-2And the hydrogen evolution rate is 0.0486ml/cm2H, corrosion current of 2.004X 10–5A cm-2Compared with Mg-Zn magnesium alloy, the Mg-Zn magnesium alloy is greatly improved, Zn element and Sc element are added into pure magnesium to achieve the effect of refining grains, the finer the grains, the more uniform the galvanic corrosion, and the better the corrosion resistance of the magnesium alloy. The Sc element and the Zn element both have higher solid solubility in pure magnesium, are not easy to form a second phase with magnesium, can completely form a single-phase magnesium alloy after solution treatment, and have better corrosion resistance; and meanwhile, Zn element and Sc element are added, so that a compact corrosion product film can be generated on the metal surface. Thereby improving the corrosion resistance of the alloy.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. The Mg-Zn-Sc magnesium alloy with high corrosion resistance is characterized by comprising the following components in percentage by weight: zn: 0.8-1.2 wt%, Sc: 0.1-1.2 wt%, unavoidable impurities less than or equal to 0.02 wt%, and the balance of Mg.
2. The magnesium alloy according to claim 1, wherein the magnesium alloy has a hydrogen rate of 0.0166 to 0.0063ml/cm2H, corrosion current of said magnesium alloy is 4.084 × 10–11～1.883×10–5A cm-2。
3. The method for preparing the Mg-Zn-Sc magnesium alloy with high corrosion resistance as recited in any one of claims 1 to 2, wherein the method comprises the following steps:
(1) smelting: putting raw material Mg into a crucible of a resistance furnace, continuously introducing protective gas, heating to completely melt the Mg, sequentially adding raw material Zn and raw material Sc, heating to completely melt, stirring and mixing uniformly, keeping the temperature for 10-20 min when the temperature rises to 700-740 ℃, removing floating slag on the surface, and obtaining pure magnesium alloy melt;
(2) and (3) solidification: placing the crucible containing the magnesium alloy melt in the step (1) in 50-60 ℃ saline water for cooling to obtain a magnesium alloy ingot;
(3) machining: machining the cast ingot in the step (2) for later use;
(4) solution treatment: carrying out heat treatment on the cast ingot subjected to machining treatment in the step (3);
(5) hot extrusion molding: preheating the cast ingot subjected to the solution treatment in the step (4) at 390-410 ℃ for 1.5-2 h, and performing air cooling after hot extrusion to obtain an extruded plate;
(6) solution treatment: and (4) carrying out solid solution treatment on the extruded plate subjected to hot extrusion in the step (5) at 390-410 ℃ to obtain the high-corrosion-resistance Mg-Zn-Sc magnesium alloy.
4. The method according to claim 3, wherein in the step (1), the raw material Mg is industrial pure magnesium ingot with the purity of 99.98 wt% or more, the raw material Zn is pure zinc with the purity of 99.99 wt% or more, and the raw material Sc is Mg-2Sc master alloy.
5. The method according to claim 3, wherein the protective gas in step (1) is CO2Gas and SF6Mixing the gases to form;
CO in the protective gas2Gas and SF6The volume ratio of the gases was 1: 99.
6. The method according to claim 3, wherein the heating temperature in the step (1) is 740 to 760 ℃; the stirring time is 3-5 min.
7. The method according to claim 3, wherein the temperature of the solution treatment in the step (4) is 390 to 410 ℃, and the time of the solution treatment is 22 to 26 hours.
8. The production method according to claim 3, wherein the extrusion ratio of the hot extrusion in the step (5) is 25:1 to 30: 1.
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| CN118326216A (en) * | 2024-04-11 | 2024-07-12 | 江苏海洋大学 | Preparation method of high-corrosion-resistance rare earth magnesium alloy |
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