A corrosion-resistant magnesium alloy for lightweight mouse and preparation method thereof

Abstract

The invention provides a corrosion-resistant magnesium alloy for a lightweight mouse and a preparation method thereof, belonging to the technical field of alloy materials. The corrosion-resistant magnesium alloy comprises the following raw materials in terms of mass percentage: Al 4.0-6.0%, Y 3.5-5.5%, Gd 1.5-3.5%, Mn 0.05-0.2%, Ca 0.05-0.2%, Sc 0.4-0.6%, Si 0.3-0.5% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 18~50, (ω Y +ω Gd ) / ω Al is 1.2~1.6,ω Sc >ω Si >ω Y +ω Gd The present invention can significantly improve the mechanical properties and corrosion resistance of magnesium alloys by adding Al, Y, Gd, Mn, Ca, Sc and Si within a specific range.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy materials, and particularly relates to a corrosion-resistant magnesium alloy for a lightweight mouse and a preparation method thereof. Background Art

[0002] With the development of science and technology and the improvement of people's quality of life, the high-end computer peripheral market has gradually shown a trend of diversified development, especially the mouse, a commonly used input device, whose design must not only meet the functional requirements, but also take into account the requirements of aesthetics, comfort and durability. At present, the mouse materials mainly include two categories: aluminum alloy and plastic. However, these two types of materials have their own advantages and disadvantages. Although aluminum alloy has excellent texture, it is heavy. Although plastic is light, it lacks a sense of luxury and is easy to age. Therefore, it is urgent to find a material that is both light and has excellent texture to prepare high-end mice.

[0003] As a new type of lightweight material, magnesium alloy has been widely used in the fields of automobiles, aviation, consumer electronics, etc. due to its high specific strength, good heat dissipation performance and easy processing and forming. Especially in the design of high-end mice, magnesium alloy has shown great potential due to its unique characteristics. Magnesium alloy is not only light in weight, but also can obtain good appearance and texture through appropriate alloying and surface treatment methods, meeting users' demand for high-end products.

[0004] Although magnesium alloys have many advantages, their intrinsic corrosion resistance is poor, especially in humid or sweaty hand use environments, magnesium alloys are susceptible to corrosion. In order to solve this problem, researchers began to explore improving the corrosion resistance and mechanical properties of magnesium alloys by adjusting their composition. For example, adding elements such as zinc and calcium can protect the magnesium matrix from corrosion, but adding too much may cause a decrease in mechanical properties; adding aluminum can improve the strength and hardness of magnesium alloys, but excessive aluminum will lead to increased corrosion; adding rare earth elements such as yttrium and gadolinium can form a dense oxide protective layer to reduce the direct contact between magnesium and corrosive media. These elements can also improve mechanical properties by forming fine dispersed strengthening phases, but excessive addition may cause increased brittleness. Therefore, the composition design of the above-mentioned magnesium alloys is unreasonable, and mechanical properties and corrosion resistance are not taken into account. It is impossible to achieve the improvement of the comprehensive performance of magnesium alloys, which affects its application in high-end mice. Summary of the invention

[0005] The purpose of the present invention is to provide a corrosion-resistant magnesium alloy for a lightweight mouse and a preparation method thereof, so as to solve the problem that the composition design of the above-mentioned magnesium alloy is unreasonable and the mechanical properties and corrosion resistance cannot be taken into account at the same time.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a corrosion-resistant magnesium alloy for a lightweight mouse, wherein the corrosion-resistant magnesium alloy comprises the following raw materials in terms of mass percentage: Al 4.0-6.0%, Y 3.5-5.5%, Gd 1.5-3.5%, Mn 0.05-0.2%, Ca 0.05-0.2%, Sc 0.4-0.6%, Si 0.3-0.5% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 18~50, (ω Y +ω Gd ) / ω Al is 1.2~1.6,ω Sc >ω Si >ω Y +ω Gd 4.5-6.8% of the total.

[0008] where ω Y ,ω Gd ,ω Mn ,ω Ca ,ω Al ,ω Sc ,ω Si They respectively represent the mass percentage of Y, Gd, Mn, Ca, Al, Sc and Si in magnesium alloy.

[0009] In order to improve the mechanical properties of magnesium alloy materials, the present invention adds Al, Y, Gd, Mn, Ca, Sc and Si elements to the composition of magnesium alloy, which form a balanced state in the magnesium alloy under a specific ratio, thereby improving the mechanical properties of the magnesium alloy. The reason for this is that aluminum and silicon elements can form a solid solution in the magnesium alloy, increasing the strength of the alloy, and Y and Gd can form fine dispersed phase particles in the magnesium alloy, such as Mg 12 Y, Mg2Gd, Mg 24 (Gd, Y)5, etc. The presence of Gd and Y elements can also promote grain refinement, because rare earth elements can promote non-spontaneous nucleation, so that the number of grains increases and the size decreases. The fine grains can improve the strength and ductility of the material. These particles are evenly distributed throughout the alloy matrix, hindering dislocation slip, thereby improving the strength of the material. Mn and Ca elements can form stable oxide particles with oxygen, distributed at the grain boundaries, preventing the movement of the grain boundaries, thereby improving the high-temperature stability of the material. The Sc element can also form fine particles with magnesium, such as Mg3Sc, which are very stable and are not easy to dissolve back into the matrix even at high temperatures. The combined action of these elements in the present invention can lead to a composite strengthening effect and improve the mechanical properties of magnesium alloy materials.

[0010] Although adding the above elements can improve the mechanical properties of magnesium alloys, their corrosion resistance is not greatly improved. The present invention continues to study and find that further limiting the content of the above elements can significantly improve the corrosion resistance of magnesium alloys. The reason for this is that Y and Gd, as rare earth elements, can form stable and dense oxide or hydroxide films in magnesium alloys. These films can effectively prevent the intrusion of corrosive media such as chloride ions. The content of Mn and Ca elements in the alloy is relatively low, but they can combine with oxygen to form oxides such as MnO and CaO. These oxides usually gather at the grain boundaries, which helps to inhibit intergranular corrosion. The present invention when (ω Y +ω Gd ) / (ω Mn +ω Ca ) is between 18 and 50, which means that the content of Y and Gd is higher than that of Mn and Ca, which helps to form more Y and Gd related protective films, while limiting the excessive aggregation of Mn and Ca related oxides, thereby avoiding grain boundary embrittlement and improving overall corrosion resistance. Al is a commonly used strengthening element in magnesium alloys, but a high content of Al may increase the difference in electrochemical activity in local areas, thereby aggravating local corrosion. In the present invention, (ω Y +ω Gd ) / ω Al By adjusting the ratio of Y and Gd to Al, the strengthening effect of Al and the protective effect of Y and Gd can be balanced, so that when the Al content is high, Y and Gd can still form a sufficient protective film to prevent the occurrence of local corrosion. Sc >ω Si >ω Y +ω Gd The addition of Sc element can promote the formation of a denser protective film, and Sc can also improve the overall performance of the alloy by refining the grains. Although the Si element has a low content, it can form phases such as Mg2Si with Mg. The formation of these phases helps to improve the mechanical properties of the alloy and can also enhance the corrosion resistance to a certain extent. By setting the Sc content to be higher than 4.5-6.8% of the total of Si and Y+Gd, the present invention can ensure that Sc plays a leading role in corrosion resistance in the alloy, while using the auxiliary role of Si to further improve the performance of the alloy.

[0011] The second invention of the present invention provides a method for preparing a corrosion-resistant magnesium alloy for a lightweight mouse, comprising the following steps:

[0012] (1) Melting

[0013] The raw materials are added into an induction melting furnace according to a certain proportion and melted under a protective atmosphere. After the melting is completed, a molten alloy is obtained.

[0014] (2) Refining

[0015] During the smelting process, refining agents are added to remove impurities;

[0016] (3) Die casting

[0017] The refined molten alloy is die-casted in a protective atmosphere to obtain a die-cast part. After the die-cast part is demolded, a mold release agent is sprayed on the mold again, and the next die-casting process is waited for;

[0018] (4) Preprocessing

[0019] Clean the shrinkage feeding structure and flash of the die-casting parts to obtain pre-treated parts;

[0020] (5) Aging heat treatment

[0021] The pre-treated parts after solution treatment are subjected to staged aging heat treatment;

[0022] (6) Surface finishing

[0023] The pre-treated parts after aging heat treatment are subjected to finishing processing to obtain a corrosion-resistant magnesium alloy for a lightweight mouse.

[0024] Preferably, in step (1) and step (3), the protective atmosphere is argon or a mixed gas of carbon dioxide and sulfur hexafluoride.

[0025] Preferably, in step (1), the smelting temperature is 680-730°C.

[0026] Preferably, in step (3), the filling speed of the die casting is 15-20 m / s, the pressure is 100-150 MPa, and the holding time is 10-15 s.

[0027] In order to further optimize the comprehensive performance of the magnesium alloy in the present invention, the filling method under specific parameters is used in the die-casting process. The pressure and speed settings can promote the alloy material to form more uniform and fine grains in the die-casting process. Fine grains can improve the strength and toughness of the material. The alloy solidifies more densely in the mold, the surface is smoother, and the surface roughness is reduced. The smooth surface can also reduce the chance of contact between the corrosive medium and the alloy matrix, thereby improving corrosion resistance. The present invention obtains the basic shape of the mouse in the die-casting process.

[0028] Preferably, during the die-casting process in step (3), the temperature of the molten alloy is 670-710°C, and the mold heating temperature is 150-180°C.

[0029] Preferably, the staged aging heat treatment includes two stages, the temperature of the first stage is 190-200°C, the holding time is 3-4h, and the temperature of the second stage is 150-160°C, the holding time is 3-4h.

[0030] In order to further optimize the comprehensive performance of the magnesium alloy in the present invention, a staged process is also carried out during the aging heat treatment process. The staged aging heat treatment can better control the formation and development of the precipitated phase. In different temperature ranges, different precipitated phases will change. Through the staged heat treatment, it can be ensured that each temperature range is conducive to the formation of favorable precipitated phases, which can significantly improve the mechanical properties of the material. The staged aging heat treatment in the present invention can promote the formation of a denser oxide film or other protective compounds, which can effectively prevent the intrusion of corrosive media, thereby improving corrosion resistance.

[0031] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0032] 1. The present invention can significantly improve the mechanical properties and corrosion resistance of magnesium alloys by adding Al, Y, Gd, Mn, Ca, Sc and Si within a specific range. In particular, by adjusting the ratio of Y to Gd and the ratio of Mn to Ca, and the specific ratio of the Sc element being higher than the sum of Si and Y+Gd, the alloy has excellent corrosion resistance while maintaining good mechanical properties.

[0033] 2. The element ratio in the alloy formula of the present invention can effectively strengthen the magnesium matrix and improve the hardness, strength and toughness of the material through solid solution strengthening and precipitation strengthening mechanisms.

[0034] 3. Due to the use of a specific combination of alloy components in the present invention, a dense oxide film or other protective compounds can be formed on the surface of the magnesium alloy, thereby enhancing the corrosion resistance of the alloy.

[0035] 4. The present invention can more finely control the microstructure of the alloy through staged aging heat treatment, promote the precipitation of beneficial phases, and reduce internal stress, thereby achieving the purpose of optimizing comprehensive performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The tensile mechanical properties of the magnesium alloy materials prepared in Examples 1-3 and Comparative Examples 1-5 are shown in FIG. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] The present embodiment provides a corrosion-resistant magnesium alloy for a lightweight mouse. The corrosion-resistant magnesium alloy includes the following raw materials in terms of mass percentage: Al 5.8%, Y 5.0%, Gd 2.5%, Mn 0.15%, Ca 0.1%, Sc 0.45%, Si 0.35% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 30, (ω Y +ω Gd ) / ω Al is 1.29, ω Sc >ω Si >ω Y +ω Gd 4.5% of the total.

[0040] A method for preparing a corrosion-resistant magnesium alloy for a lightweight mouse comprises the following steps:

[0041] (1) Melting

[0042] The raw materials are added into an induction melting furnace according to a proportion and melted in an argon atmosphere at a temperature of 700° C. After the melting is completed, a molten alloy is obtained;

[0043] (2) Refining

[0044] During the smelting process, a refining agent is added to remove impurities. The refining agent is NaF, and the amount of the refining agent added is 2wt%;

[0045] (3) Die casting

[0046] The refined molten alloy is die-casted in a protective atmosphere to obtain a die-cast part. After the die-cast part is demolded, the mold is sprayed with a release agent again, waiting for the next die-casting process. The filling speed of the die-casting mold is 18m / s, the pressure is 120MPa, and the holding time is 12s. The release agent is the water-soluble release agent M-600 for magnesium alloy die-casting provided by Meibang Surface Treatment Technology Co., Ltd.

[0047] (4) Preprocessing

[0048] Clean the shrinkage feeding structure and flash of the die-casting parts to obtain pre-treated parts;

[0049] (5) Aging heat treatment

[0050] The pre-treated parts after solution treatment are subjected to staged aging heat treatment;

[0051] The staged aging heat treatment includes two stages. The temperature of the first stage is 195°C and the holding time is 3h. The temperature of the second stage is 155°C and the holding time is 3.5h.

[0052] (6) Surface finishing

[0053] The pre-treated parts after aging heat treatment are subjected to finishing processing to obtain a corrosion-resistant magnesium alloy for a lightweight mouse.

[0054] Example 2

[0055] The present embodiment provides a corrosion-resistant magnesium alloy for a lightweight mouse. The corrosion-resistant magnesium alloy includes the following raw materials in terms of mass percentage: Al 5.0%, Y 4.5%, Gd 3.0%, Mn 0.1%, Ca 0.05%, Sc 0.5%, Si 0.45% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 50, (ω Y +ω Gd ) / ω Al is 1.5, ω Sc >ω Si >ω Y +ω Gd 5.2% of the total.

[0056] A method for preparing a corrosion-resistant magnesium alloy for a lightweight mouse comprises the following steps:

[0057] (1) Melting

[0058] The raw materials are added into an induction melting furnace according to a proportion and melted in an argon atmosphere at a melting temperature of 685° C. After the melting is completed, a molten alloy is obtained;

[0059] (2) Refining

[0060] During the smelting process, a refining agent is added to remove impurities. The refining agent is NaF, and the amount of the refining agent added is 2wt%;

[0061] (3) Die casting

[0062] The refined molten alloy is die-casted in a protective atmosphere to obtain a die-cast part. After the die-cast part is demolded, the mold is sprayed with a release agent again, waiting for the next die-casting process; the release agent is the water-soluble release agent M-600 for magnesium alloy die-casting provided by Meibang Surface Treatment Technology Co., Ltd.;

[0063] The filling speed of the die casting mold is 15m / s, the pressure is 150MPa, and the holding time is 10s;

[0064] (4) Preprocessing

[0065] Clean the shrinkage feeding structure and flash of the die-casting parts to obtain pre-treated parts;

[0066] (5) Aging heat treatment

[0067] The pre-treated parts after solution treatment are subjected to staged aging heat treatment;

[0068] The staged aging heat treatment includes two stages. The temperature of the first stage is 190°C and the holding time is 4 hours. The temperature of the second stage is 150°C and the holding time is 4 hours.

[0069] (6) Surface finishing

[0070] The pre-treated parts after aging heat treatment are subjected to finishing processing to obtain a corrosion-resistant magnesium alloy for a lightweight mouse.

[0071] Example 3

[0072] The present embodiment provides a corrosion-resistant magnesium alloy for a lightweight mouse. The corrosion-resistant magnesium alloy includes the following raw materials in terms of mass percentage: Al 4.5%, Y 4.8%, Gd 2.2%, Mn 0.2%, Ca 0.17%, Sc 0.58%, Si 0.5% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 18.9, (ω Y +ω Gd ) / ω Al is 1.56, ω Sc >ω Si >ω Y +ω Gd 6.5% of the total.

[0073] A method for preparing a corrosion-resistant magnesium alloy for a lightweight mouse comprises the following steps:

[0074] (1) Melting

[0075] The raw materials are added into an induction melting furnace according to a proportion and melted in an argon atmosphere at a melting temperature of 725°C. After the melting is completed, a molten alloy is obtained;

[0076] (2) Refining

[0077] During the smelting process, a refining agent is added to remove impurities. The refining agent is NaF, and the amount of the refining agent added is 2wt%;

[0078] (3) Die casting

[0079] The refined molten alloy is die-casted in a protective atmosphere to obtain a die-cast part. After the die-cast part is demolded, the mold is sprayed with a release agent again, waiting for the next die-casting process; the release agent is the water-soluble release agent M-600 for magnesium alloy die-casting provided by Meibang Surface Treatment Technology Co., Ltd.;

[0080] The filling speed of die casting is 20m / s, the pressure is 100MPa, and the holding time is 15s;

[0081] (4) Preprocessing

[0082] Clean the shrinkage feeding structure and flash of the die-casting parts to obtain pre-treated parts;

[0083] (5) Aging heat treatment

[0084] The pre-treated parts after solution treatment are subjected to staged aging heat treatment;

[0085] The staged aging heat treatment includes two stages. The temperature of the first stage is 190℃ and the holding time is 3h. The temperature of the second stage is 160℃ and the holding time is 3h.

[0086] (6) Surface finishing

[0087] The pre-treated parts after aging heat treatment are subjected to finishing processing to obtain a corrosion-resistant magnesium alloy for a lightweight mouse.

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 1 is that the composition of the magnesium alloy is different. The corrosion-resistant magnesium alloy in this comparative example includes the following raw materials in terms of mass percentage: Al 3.5%, Y 3.0%, Gd 1.8%, Mn 0.4%, Ca 0.3%, Sc 0.45%, Si 0.35% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 6.86, (ω Y +ω Gd ) / ω Al is 1.37, ω Sc >ω Si >ω Y +ω Gd 6.8% of the total.

[0090] Comparative Example 2

[0091] The difference between this comparative example and Example 1 is that the composition of the magnesium alloy is different. The corrosion-resistant magnesium alloy in this comparative example includes the following raw materials in terms of mass percentage: Al 4.0%, Y 5.0%, Gd 2.5%, Mn 0.15%, Ca 0.1%, Sc 0.45%, Si 0.35% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 30, (ω Y+ω Gd ) / ω Al is 1.875, ω Sc >ω Si >ω Y +ω Gd 4.5% of the total.

[0092] Comparative Example 3

[0093] The difference between this comparative example and Example 1 is that the corrosion-resistant magnesium alloy includes the following raw materials in mass percentage: Al 5.8%, Y 5.0%, Gd 2.5%, Mn 0.15%, Ca 0.1%, Sc 0.2%, Si 0.1% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 30, (ω Y +ω Gd ) / ω Al is 1.29, ω Sc >ω Si ,ω Sc and ω Si Both are less than ω Y +ω Gd 4.5% of the total.

[0094] Comparative Example 4

[0095] The difference between this comparative example and Example 1 is that the die-casting parameters in step (3) are different. The die-casting parameters of this comparative example are:

[0096] The filling speed of the die casting mold is 30m / s, the pressure is 80MPa, and the holding time is 40s.

[0097] Comparative Example 5

[0098] The difference between this comparative example and Example 1 is that the aging heat treatment process in step (5) is different. This comparative example does not perform staged aging heat treatment. The aging heat treatment process of this comparative example is:

[0099] Aging heat treatment was performed at 175°C for 6.5 h.

[0100] Performance Testing

[0101] The magnesium alloy materials after aging heat treatment in the embodiment and the comparative example were tested for mechanical properties according to GB / T 228.1-2010 "Tensile test of metallic materials Part 1: Room temperature test method".

[0102] The magnesium alloy materials prepared in the examples and comparative examples were immersed in a 3.5wt% NaCl solution for 7 days, and then the corrosion rate was calculated. The test results are shown in Tables 1 and Figure 1.

[0103] Corrosion rate = (mass of magnesium alloy tube before immersion - mass of magnesium alloy tube after immersion) / (specific surface area of ​​magnesium alloy tube × number of immersion days).

[0104] Table 1 Performance test results

[0105]

[0106] It can be seen from the above performance test results that the magnesium alloys of Examples 1-3 have excellent mechanical properties and corrosion resistance, especially the corrosion resistance of Example 2 is the most outstanding. This is mainly because the present invention can significantly improve the mechanical properties and corrosion resistance of magnesium alloys by adding Al, Y, Gd, Mn, Ca, Sc and Si within a specific range, especially by adjusting the ratio of Y and Gd and the ratio of Mn and Ca, and the content of Sc element is higher than the specific ratio of Si and the sum of Y+Gd.

[0107] The comparative example does not adopt the necessary technical solution, resulting in its performance being significantly worse than that of the embodiment. In comparative example 1, the mass percentages of Al, Y, Gd and Mn are changed, wherein the mass percentages of Al, Y and Mn are all beyond the range defined by the present invention. Although Gd does not exceed the range defined by the present invention, it affects (ω Y +ω Gd ) / (ω Mn +ω Ca ) mass ratio, it can be seen from the results that the mechanical properties and corrosion resistance of the magnesium alloy material prepared therefrom are significantly reduced, indicating that the proportion of the added elements in the present invention has a very important influence on the comprehensive properties of the magnesium alloy. In Comparative Example 2, the mass percentage of Al was changed, resulting in (ω Y +ω Gd ) / ω Al The mass ratio of Sc and Si exceeds the range specified in the present invention. From the results, it can be seen that the comprehensive performance of the magnesium alloy material prepared therefrom is significantly reduced, indicating that further limiting the ratio between the elements in the present invention has a very important influence on improving the mechanical properties and corrosion resistance of the magnesium alloy material. In Comparative Example 3, the mass percentage of Sc and Si added is modified, which leads to ω Sc and ω Si Both are less than ω Y +ω Gd4.5% of the total. It can be seen from the results that the comprehensive properties of the magnesium alloy prepared therefrom are significantly reduced, indicating that limiting the addition amount of Sc and Si has a very important influence on improving the comprehensive properties of the magnesium alloy. In Comparative Examples 4 and 5, the parameters in the die-casting process and the staged aging heat treatment process in the present invention are changed respectively. It can be seen from the results that the comprehensive properties of the magnesium alloy prepared therefrom are significantly reduced, indicating that the specific die-casting process and aging treatment process will affect the preparation of the magnesium alloy to a certain extent, which has an important influence on improving the comprehensive properties of the magnesium alloy. In Comparative Example 6, the specific temperature setting of the staged aging heat treatment is changed, and the temperature is changed from the gradually decreasing process in the present invention to the gradually increasing process. It can be seen from the results that this leads to a decrease in the comprehensive properties of the magnesium alloy, indicating that the temperature setting of the aging heat treatment in the present invention has a certain degree of influence on improving the mechanical properties and corrosion resistance of the magnesium alloy. The above experimental results further prove the importance of the technical scheme defined in the present invention for its technical effect.

[0108] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant magnesium alloy for a lightweight mouse, characterized in that: The corrosion-resistant magnesium alloy includes the following raw materials according to mass percentage: Al 4.0-6.0%, Y 3.5-5.5%, Gd 1.5-3.5%, Mn 0.05-0.2%, Ca 0.05-0.2%, Sc 0.4-0.6%, Si 0.3-0.5% and the balance Mg, wherein (ω Y +ω Gd ) / (ω Mn +ω Ca ) is 18~50, (ω Y +ω Gd ) / ω Al is 1.2~1.6,ω Sc >ω Si >ω Y +ω Gd 4.5-6.8% of the total.

2. A method for preparing a corrosion-resistant magnesium alloy for a lightweight mouse according to claim 1, characterized in that: The following steps are involved: (1) Melting The raw materials are added into an induction melting furnace according to a certain proportion and melted under a protective atmosphere. After the melting is completed, a molten alloy is obtained. (2) Refining During the smelting process, refining agents are added to remove impurities; (3) Die casting The refined molten alloy is die-casted in a protective atmosphere to obtain a die-cast part. After the die-cast part is demolded, a mold release agent is sprayed on the mold again, and the next die-casting process is waited for; (4) Preprocessing Clean the shrinkage feeding structure and flash of the die-casting parts to obtain pre-treated parts; (5) Aging heat treatment The pre-treated parts after solution treatment are subjected to staged aging heat treatment; (6) Surface finishing The pre-treated parts after aging heat treatment are subjected to finishing processing to obtain a corrosion-resistant magnesium alloy for a lightweight mouse.

3. The method for preparing the corrosion-resistant magnesium alloy for lightweight mouse according to claim 2, characterized in that: In step (1) and step (3), the protective atmosphere is argon or a mixed gas of carbon dioxide and sulfur hexafluoride.

4. The method for preparing the corrosion-resistant magnesium alloy for lightweight mouse according to claim 2, characterized in that: In step (1), the smelting temperature is 680-730°C.

5. The method for preparing the corrosion-resistant magnesium alloy for lightweight mouse according to claim 2, characterized in that: In step (3), the filling speed of the die casting is 15-20 m / s, the pressure is 100-150 MPa, and the holding time is 10-15 s.

6. The method for preparing the corrosion-resistant magnesium alloy for lightweight mouse according to claim 2, characterized in that: During the die-casting process of step (3), the temperature of the molten alloy is 670-710°C, and the mold heating temperature is 150-180°C.

7. The method for preparing the corrosion-resistant magnesium alloy for lightweight mouse according to claim 2, characterized in that: The staged aging heat treatment includes two stages. The temperature of the first stage is 190-200℃, and the holding time is 3-4h. The temperature of the second stage is 150-160℃, and the holding time is 3-4h.

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