CN111155016A - Corrosion-resistant ternary magnesium alloy and preparation method thereof - Google Patents
Corrosion-resistant ternary magnesium alloy and preparation method thereof Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 94
- 230000007797 corrosion Effects 0.000 title claims abstract description 56
- 238000005260 corrosion Methods 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 39
- 239000011777 magnesium Substances 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims description 41
- 229910045601 alloy Inorganic materials 0.000 claims description 34
- 230000001681 protective effect Effects 0.000 claims description 19
- 229910052749 magnesium Inorganic materials 0.000 claims description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 230000004580 weight loss Effects 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 229910002056 binary alloy Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000007739 conversion coating Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000542 Sc alloy Inorganic materials 0.000 description 1
- 229910009378 Zn Ca Inorganic materials 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium(III) oxide Inorganic materials O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
-
- 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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a corrosion-resistant ternary magnesium alloy and a preparation method thereof, wherein the corrosion-resistant ternary magnesium alloy comprises the following elements in percentage by mass: and (C) Sc: 2-5 wt.%, Y: 0.3-2.2 wt.%, the balance being Mg and inevitable impurity elements, the impurity element Fe content not exceeding 0.02 wt.%, the impurity element Cu content not exceeding 0.02 wt.%, and the impurity element Ni content not exceeding 0.003 wt.%. Prepared by smelting in a well-type resistance furnace. Compared with the prior art, the invention has the advantages of simple and environment-friendly preparation process, good corrosion resistance and the like.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy, and particularly relates to a corrosion-resistant ternary magnesium alloy and a preparation method thereof.
Background
The magnesium alloy has low density, high specific strength, large elastic modulus, good heat dissipation and shock absorption performance, strong impact load resistance and wide application prospect. However, the electrode potential of magnesium is more negative (-2.38 VNHE), the chemical property is active, galvanic corrosion is easy to occur, the PBR (balling-Bedworth ratio) of magnesium is less than 1, and a generated oxide film is loose and porous and cannot play an effective protection role, so that the corrosion resistance of the magnesium alloy in a humid environment is poor.
In order to reduce the influence of poor corrosion resistance of magnesium alloy in engineering application, the magnesium alloy is usually subjected to anodic oxidation treatment, surface coating treatment or chemical conversion coating treatment, so that the surface of the magnesium alloy is coated with a protective film which is tightly combined with a matrix, thereby preventing corrosion from entering and preventing the magnesium alloy matrix from being oxidized. The anodic oxidation method can obviously improve the corrosion resistance of the magnesium alloy, and the generated oxide film has strong binding capacity with the magnesium alloy matrix and is more commonly used, but because a large amount of electrolyte is used in the treatment process, the potential threat to human and environmental health exists; the corrosion resistance of the magnesium alloy can also be improved by surface coating treatment, but coatings with many common chemical conversion coating technologies have weaker binding capacity with a matrix and are easy to fall off, while the mature chromate treatment technology has better corrosion resistance effect, but hexavalent chromium ions are generated in the treatment process, so that the magnesium alloy has stronger toxicity and the use is strictly limited.
Therefore, it is important to provide an alloying method to improve the corrosion resistance of magnesium alloy and generate a protective oxide film layer.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a corrosion-resistant ternary magnesium alloy. The designed magnesium alloy mainly comprises two alloying elements of Sc and Y, and is prepared by smelting in a well-type resistance furnace. The magnesium alloy is soaked in 3.5 wt.% NaCl aqueous solution for 72h at room temperature, and the hydrogen evolution rate is less than 0.25ml/cm2Day, weight loss rate less than 0.3mg/cm2(day) and the oxide film Sc formed2O3And Y2O3Has better protection.
The purpose of the invention can be realized by the following technical scheme: the corrosion-resistant ternary magnesium alloy is characterized by comprising the following elements in percentage by mass: and (C) Sc: 2-5 wt.%, Y: 0.3-2.2 wt.%, the balance being Mg and inevitable impurity elements, the impurity element Fe content not exceeding 0.02 wt.%, the impurity element Cu content not exceeding 0.02 wt.%, and the impurity element Ni content not exceeding 0.003 wt.%.
The magnesium alloy is soaked in 3.5 wt.% NaCl aqueous solution for 72 hours at room temperature, and the hydrogen evolution rate is less than 0.25ml/cm2Day, weight loss rate less than 0.3mg/cm2Day, and a layer of Sc is formed on the surface of the magnesium alloy2O3And Y2O3The oxide film of (3).
The magnesium alloy is prepared from Mg-Sc intermediate alloy which is a peritectic system and Mg-Y intermediate alloy which is a eutectic system; a pure magnesium ingot.
The content of impurity element Fe in the Mg-Sc and Mg-Y master alloy is not more than 0.02 wt.%, the content of impurity element Cu is not more than 0.01 wt.%, and the content of impurity element Ni is not more than 0.003 wt.%.
The content of impurity element Fe in the pure magnesium ingot is not more than 0.01 wt.%, the content of impurity element Cu is not more than 0.001 wt.%, and the content of impurity element Ni is not more than 0.001 wt.%.
As a preferable scheme of the corrosion-resistant ternary magnesium alloy, in the components of the corrosion-resistant ternary magnesium alloy, the mass percent of Sc is 4-5 wt.%, and the mass percent of Y is 0.5-1.5 wt.%.
As a preferable mode of the corrosion-resistant ternary magnesium alloy of the present invention, the corrosion-resistant ternary magnesium alloy has the composition elements that the content of the inevitable impurity element Fe is not more than 0.01 wt.%, the content of Cu is not more than 0.01 wt.%, and the content of Ni is not more than 0.0005 wt.%.
The invention also provides a preparation method of the corrosion-resistant ternary magnesium alloy, which comprises the following steps:
(1) under the protective atmosphere, all the raw materials are completely melted in a well-type resistance crucible furnace to prepare a magnesium alloy melt: after melting a magnesium ingot with the purity of not less than 99.9 wt.%, adding an Mg-Sc intermediate alloy and an Mg-Y intermediate alloy at 660-700 ℃, and obtaining a magnesium alloy melt after melting the Mg-Sc intermediate alloy and the Mg-Y intermediate alloy;
(2) stirring the magnesium alloy melt at 730-740 ℃ under a protective atmosphere, standing, refining, degassing and deslagging at 720-730 ℃, standing again, and preserving heat at 720-730 ℃ to obtain a magnesium alloy liquid;
(3) and casting and molding the magnesium alloy liquid under a protective atmosphere to obtain the magnesium alloy material.
The protective atmosphere is SF6And CO2The gas mixed according to the volume ratio of 1:6 acts on the surface of the melt of the magnesium alloy liquid to form a continuous and compact modified magnesium oxide film, so that the oxidation and combustion of the magnesium alloy liquid are prevented, and the slag inclusion defect caused by flux smelting is reduced, thereby playing the roles of protecting the melt and improving the corrosion resistance of the alloy.
Compared with the prior art, the invention has the following advantages:
sc and Y with larger PBR value are added into the magnesium alloy, and Sc is obtained after oxidation2O3And Y2O3Can obviously enhance the compactness of an oxidation film and overcome the defect of loose and porous MgO, and Sc2O3、Y2O3Good compatibility with MgO, and obvious effect of enhancing the corrosion resistance of the magnesium alloy. In addition, the Mg-Sc binary alloy is peritectic, and a Sc-rich area and a Mg-rich area (a Sc-poor area) are obvious in the Mg-Sc binary alloy, as shown in the attached figure 1(a), due to the potential difference, galvanic corrosion can occur between the Sc-rich area and the Mg-rich area, and the corrosion resistance of the alloy is influenced; the Mg-Y binary alloy is a eutectic system, and after the Y element is added into the Mg-Sc alloy, Y is segregated and enriched to the Mg-rich area, as shown in the attached figure 1(b), so that the potential difference between the original Mg-rich area and the Sc-rich area is reduced, the thermodynamic tendency of corrosion is reduced, and the Mg-Sc-Y ternary alloy has excellent corrosion resistance.
Drawings
FIG. 1(a) is an SEM photograph and a spectral profile of an Mg-4Sc alloy (Mg and Sc elements are shown from left to right in sequence); (b) an SEM photograph and a power spectrum scanning image (Mg, Sc and Y elements are sequentially arranged from left to right) of the Mg-4Sc-1Y alloy.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention.
The following examples will disclose a novel corrosion resistant ternary magnesium alloy consisting of, in mass percent: and (C) Sc: 2-5 wt.%, Y: 0.3-2.2 wt.%, the balance being Mg and unavoidable impurity elements.
Furthermore, the mass percent of Sc in the alloy is 4-5 wt.%, and the mass percent of Y is 0.5-1.5 wt.%.
Further, the impurity element Fe content in the alloy is not more than 0.02 wt.%, the impurity element Cu content is not more than 0.02 wt.%, and the impurity element Ni content is not more than 0.003 wt.%.
Further, the impurity element Fe content in the alloy is not more than 0.01 wt.%, the impurity element Cu content is not more than 0.01 wt.%, and the impurity element Ni content is not more than 0.0005 wt.%.
Example 1:
the method for preparing the novel corrosion-resistant ternary magnesium alloy comprises the following steps:
(1) under a protective atmosphere, after a magnesium ingot with the purity not lower than 99.9 wt.% is melted, adding an Mg-Sc intermediate alloy and an Mg-Y intermediate alloy at 660-700 ℃, and obtaining a magnesium alloy melt after the Mg-Sc intermediate alloy and the Mg-Y intermediate alloy are melted.
(2) Stirring the magnesium alloy melt at 730-740 ℃ under a protective atmosphere, standing, refining, degassing and deslagging at 720-730 ℃, standing again, and preserving heat at 720-730 ℃ to obtain a magnesium alloy liquid;
(3) and casting and molding the magnesium alloy liquid under a protective atmosphere to obtain the magnesium alloy material.
Through detection, the magnesium alloy obtained in the embodiment comprises the following chemical components in percentage by weight: and (C) Sc: 4.2 wt.%, Y: 1.3 wt.%, impurity element Fe: 0.01 wt.%, impurity element Cu: 0.01 wt.%, impurity element Ni: 0.002 wt.%, balance magnesium.
Example 2:
the method for preparing the novel corrosion-resistant ternary magnesium alloy comprises the following steps:
(1) under a protective atmosphere, after a magnesium ingot with the purity not lower than 99.9 wt.% is melted, adding an Mg-Sc intermediate alloy and an Mg-Y intermediate alloy at 660-700 ℃, and obtaining a magnesium alloy melt after the Mg-Sc intermediate alloy and the Mg-Y intermediate alloy are melted.
(2) Stirring the magnesium alloy melt at 730-740 ℃ under a protective atmosphere, standing, refining, degassing and deslagging at 720-730 ℃, standing again, and preserving heat at 720-730 ℃ to obtain a magnesium alloy liquid;
(3) and casting and molding the magnesium alloy liquid under a protective atmosphere to obtain the magnesium alloy material.
Through detection, the magnesium alloy obtained in the embodiment comprises the following chemical components in percentage by weight: and (C) Sc: 4.2 wt.%, Y: 0.6 wt.%, impurity element Fe: 0.01 wt.%, impurity element Cu: 0.01 wt.%, impurity element Ni: 0.002 wt.%, balance magnesium.
Example 3:
the method for preparing the novel corrosion-resistant ternary magnesium alloy comprises the following steps:
(1) under a protective atmosphere, after a magnesium ingot with the purity not lower than 99.9 wt.% is melted, adding an Mg-Sc intermediate alloy and an Mg-Y intermediate alloy at 660-700 ℃, and obtaining a magnesium alloy melt after the Mg-Sc intermediate alloy and the Mg-Y intermediate alloy are melted.
(2) Stirring the magnesium alloy melt at 730-740 ℃ under a protective atmosphere, standing, refining, degassing and deslagging at 720-730 ℃, standing again, and preserving heat at 720-730 ℃ to obtain a magnesium alloy liquid;
(3) and casting and molding the magnesium alloy liquid under a protective atmosphere to obtain the magnesium alloy material.
Through detection, the magnesium alloy obtained in the embodiment comprises the following chemical components in percentage by weight: and (C) Sc: 4.1 wt.%, Y: 1.9 wt.%, impurity element Fe: 0.01 wt.%, impurity element Cu: 0.02 wt.%, impurity element Ni: 0.002 wt.%, balance magnesium.
And (3) performance testing:
1. hydrogen evolution weight loss test:
the magnesium alloys obtained in examples 1 to 3 were immersed in 3.5 wt.% NaCl solution for 72 hours for hydrogen evolution and weight loss tests, and the results are shown in table 1.
| Alloy (I) | Hydrogen evolution rate (ml/cm)2/day) | Rate of weight loss (mg/cm)2/day) |
| Mg-4.2Sc-1.3Y | 0.177 | 0.208 |
| Mg-4.2Sc-0.6Y | 0.276 | 0.324 |
| Mg-4.1Sc-1.9Y | 0.412 | 0.484 |
As can be seen from Table 1, the corrosion-resistant ternary magnesium alloy prepared by the method is soaked in 3.5 wt.% NaCl aqueous solution for 72 hours at room temperature, and the hydrogen evolution rate is less than 0.42ml/cm2Day, weight loss rate less than 0.5mg/cm2/day。
As can be seen from Table 1, the corrosion-resistant ternary magnesium alloy Mg-4.2Sc-1.3Y prepared by the method has the best corrosion resistance, and is soaked in 3.5 wt.% NaCl aqueous solution for 72 hours at room temperature, and the hydrogen evolution rate is 0.177ml/cm2Day, weight loss rate less than 0.208mg/cm2/day。
2. And (3) testing a potentiodynamic polarization curve:
the magnesium alloys obtained in examples 1-3 were subjected to potentiodynamic polarization curve testing using a PARSTAT 2273 electrochemical workstation in a 3.5 wt.% NaCl solution, starting from 300mV below the open circuit potential and with a scan rate of 1 mV/s.
TABLE 2 Corrosion Current Density I of magnesium alloy obtained in examplescorr
| Mg-Sc-Y | Example 1 | Example 2 | Example 3 |
| Icorr(μA/cm2) | 7.9 | 8.4 | 8.7 |
As can be seen from Table 2, I of the corrosion-resistant ternary magnesium alloy prepared by the invention in 3.5 wt.% NaCl aqueous solution at room temperaturecorrAre in the same order of magnitude and are all less than 10 mu A/cm2。
As can be seen from Table 2, the corrosion-resistant ternary magnesium alloy Mg-4.2Sc-1.3Y prepared by the method has the best corrosion resistance, IcorrIs 7.9 muA/cm2。
Table 3 shows the comparison of the method for improving the corrosion resistance of the magnesium alloy according to the invention and other schemes for improving the corrosion resistance of the magnesium alloy
| Film coating technology | Film coating environment | Sample (I) | Icorr(μA/cm2) |
| Example 1 | 25℃ | Mg-Sc-Y | 7.9 |
| Micro-arc oxidation[1] | 520V | AM60B | 4.2 |
| Anodic electrolytic deposition[2] | 1.0V | Mg-Zn-Ca | 6.0 |
| Cathodic electrodeposition[3] | -1.6V | AZ91D | 9.8 |
The relevant contents of the micro-arc oxidation in the table are described in detail in the references: [1] liang, L.Hu, J.Hao, Characterization of micro oxidation reactions for AM60B magnetic alloys in silicates and phosphate electrolytes, Applied Surface Science,253(2007) 4490-.
The references are detailed in the table concerning anodic electrolytic deposition: [2] T.Lei, C.Ouyang, W.Tang, L.F.Li, L.S.Zhou, Preparation of MgO Coatings on magnesium alloys for correlation protection, Surface & Coatings Technology,204(2010) 3798-.
The relevant contents of cathodic electrodeposition are detailed in the tables in the references: [2]M.J.Wang,C.F.Li,S.K.Yen,Electrolytic MgO/ZrO2duplex-layer coating on AZ91D magnesium alloy forcorrosion resistance,Corrosion Science,76(2013)142-153.
As can be seen from Table 3, the corrosion resistance of the corrosion-resistant ternary magnesium alloy is not much different from that of other corrosion-resistant technologies, but the preparation method of the corrosion-resistant ternary magnesium alloy has the advantages of simple operation, no environmental pollution and high popularization value.
It should be noted that the composition of the magnesium alloy of the present invention is not limited to the ranges disclosed in the above examples, as long as the alloy composition satisfies Sc: 2-5 wt.%, Y: 0.3-2.2 wt.% (preferably, the mass percent of Sc is 4-5 wt.%, and the mass percent of Y is 0.5-1.5 wt.%), the content of inevitable impurity elements Fe is not more than 0.02 wt.%, the content of impurity elements Cu is not more than 0.02 wt.%, and the content of impurity elements Ni is not more than 0.003 wt.% (preferably, the content of Fe is not more than 0.01 wt.%, the content of Cu is not more than 0.01 wt.%, and the content of Ni is not more than 0.0005 wt.%), and has better corrosion resistance.
Examples 4 to 6
Preparation method and Performance test method the same as example 1
The components and properties of the obtained ternary magnesium alloy are shown in the following table 4:
finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. The corrosion-resistant ternary magnesium alloy is characterized by comprising the following elements in percentage by mass: and (C) Sc: 2-5 wt.%, Y: 0.3-2.2 wt.%, the balance being Mg and inevitable impurity elements, the impurity element Fe content not exceeding 0.02 wt.%, the impurity element Cu content not exceeding 0.02 wt.%, and the impurity element Ni content not exceeding 0.003 wt.%.
2. The corrosion-resistant ternary magnesium alloy of claim 1, wherein said magnesium alloy is immersed in a 3.5 wt.% aqueous solution of NaCl for 72 hours at room temperature and has a hydrogen evolution rate of less than 0.25ml/cm2Day, weight loss rate less than 0.3mg/cm2Day, and a layer of Sc is formed on the surface of the magnesium alloy2O3And Y2O3The oxide film of (3).
3. The corrosion-resistant ternary magnesium alloy of claim 1, wherein the magnesium alloy is prepared from the raw materials of Mg-Sc master alloy, Mg-Y master alloy and pure magnesium ingot.
4. The corrosion-resistant ternary magnesium alloy according to claim 1, wherein the corrosion-resistant ternary magnesium alloy comprises 4 to 5 wt.% of Sc and 0.5 to 1.5 wt.% of Y.
5. The corrosion-resistant ternary magnesium alloy according to claim 1, wherein the composition elements of the corrosion-resistant ternary magnesium alloy comprise unavoidable impurity elements of not more than 0.01 wt.% of Fe, not more than 0.01 wt.% of Cu, and not more than 0.0005 wt.% of Ni.
6. A preparation method of the corrosion-resistant ternary magnesium alloy according to any one of claims 1 to 5, comprising the following steps:
(1) under the protective atmosphere, all the raw materials are completely melted in a well-type resistance crucible furnace to prepare a magnesium alloy melt;
(2) stirring the magnesium alloy melt at 730-740 ℃ under a protective atmosphere, standing, refining, degassing and deslagging at 720-730 ℃, standing again, and preserving heat at 720-730 ℃ to obtain a magnesium alloy liquid;
(3) and casting and molding the magnesium alloy liquid under a protective atmosphere to obtain the magnesium alloy material.
7. The method for preparing the corrosion-resistant ternary magnesium alloy according to claim 6, wherein the method for preparing the magnesium alloy melt in the step (1) comprises the following steps:
after melting a magnesium ingot with the purity not lower than 99.9 wt.%, adding an Mg-Sc intermediate alloy and an Mg-Y intermediate alloy at 660-700 ℃, and obtaining a magnesium alloy melt after melting the Mg-Sc intermediate alloy and the Mg-Y intermediate alloy.
8. The method for preparing the corrosion-resistant ternary magnesium alloy of claim 6, wherein the protective atmosphere is SF6And CO2Gas mixed in a volume ratio of 1: 6.
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| CN106834852A (en) * | 2017-02-15 | 2017-06-13 | 苏州慧金新材料科技有限公司 | A kind of high strength anti-corrosion magnesium alloy |
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| CN106834852A (en) * | 2017-02-15 | 2017-06-13 | 苏州慧金新材料科技有限公司 | A kind of high strength anti-corrosion magnesium alloy |
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| Title |
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| 徐昕媚 等: "Mg-Sc-Y三元合金的微观组织和力学性能", 《上海航天》 * |
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Application publication date: 20200515 |