Raw material composition of zinc-aluminum-rare earth alloy, zinc-aluminum-rare earth alloy, preparation method of zinc-aluminum-rare earth alloy and coating

Abstract

The invention discloses a raw material composition of a zinc-aluminum-rare earth alloy, the zinc-aluminum-rare earth alloy, a preparation method of the zinc-aluminum-rare earth alloy and a coating. The raw material composition of the zinc-aluminum-rare earth alloy comprises the following components in percentage by mass: 16%-50% of Al; 0.001% to 0.18% of Mg; 0.01%-0.5% of a rare earth element RE; the rare earth element RE is one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; the balance is Zn; the percentage refers to the percentage of the mass of each element in the mass of the raw material composition. The zinc-aluminum-rare earth alloy provided by the invention is high in bonding strength with a base material and excellent in corrosion resistance.

Description

Technical Field

[0001] This invention mainly relates to the raw material composition of zinc-aluminum-rare earth alloys, zinc-aluminum-rare earth alloys, their preparation methods, and coatings. Background Technology

[0002] Zinc and aluminum wires are widely used as spray coating materials for metal connection layers in new energy and electronic components, as well as for anti-corrosion layers in large structural parts, due to their good electrical conductivity, good corrosion resistance, and low price. However, pure zinc coatings are less protective of steel structures in industrial and seawater environments than aluminum coatings, and aluminum coatings have poorer cathodic protection than zinc coatings due to the presence of an oxide film. Zn-Al coatings combine the advantages of both zinc and aluminum coatings, and their anti-corrosion effect is superior to that of pure zinc or pure aluminum coatings. Currently, there are three main methods for preparing high-aluminum Zn-Al coatings by thermal spraying: pseudo-alloy coatings, i.e., coatings prepared by spraying one zinc wire and one aluminum wire; coatings prepared by solid wires, i.e., first preparing zinc-aluminum solid wires, and then spraying them with two wires; and coatings prepared by powder-core wires. Because the increase in brittle phases when the Al content of solid wires exceeds 15% makes wire preparation difficult, the method of preparing coatings by wrapping zinc-aluminum powder with hollow zinc sheets is often used.

[0003] Compared to coatings made from solid wire, coatings made from pseudo-alloy wire and powder-core wire exhibit poor uniformity, as well as poor adhesion and corrosion resistance. Chinese patent CN105063538A discloses a zinc-aluminum alloy with the following elemental composition: Al: 18-22%, Mg: 0.1-0.5%, RE: 0.1-0.5%, with the balance being zinc. Chinese patent CN106702213A discloses a zinc-aluminum alloy with the following elemental composition: Al: 15-40%, Mg: 0.2-4.0%, rare earth elements (cerium and erbium): 0.02-0.2%, impurities not exceeding 0.025%, and the balance being zinc. Chinese patent CN102703780A discloses a zinc-aluminum alloy with the following elemental composition: Al: 15.69%, Si: 0.2.3%, Mg: 0.1.5%, La: 0.01-0.8%, Ce: 0.01-0.4%, Nd: 0.01-0.2%, with the balance being zinc. Using the composition and process disclosed in the above-mentioned patent to prepare the wire results in a high wire breakage rate, especially when the wire is drawn to below 2.0 mm, where the breakage rate increases by 50%. Furthermore, the wire used in the preparation of the coating layer has insufficient adhesion to the substrate.

[0004] Therefore, how to achieve zinc-aluminum rare earth alloys with low wire breakage rate, high bonding strength with substrate and good corrosion resistance under high aluminum content has attracted widespread attention. Summary of the Invention

[0005] This invention aims to overcome the deficiency of insufficient bonding strength between high-aluminum-content zinc-aluminum rare earth alloys and substrates, and provides a raw material composition for zinc-aluminum rare earth alloys, the zinc-aluminum rare earth alloy itself, its preparation method, and a coating. The zinc-aluminum rare earth alloys provided by this invention exhibit high bonding strength with the substrate and excellent corrosion resistance.

[0006] This invention provides a raw material composition for a zinc-aluminum rare earth alloy, which, by mass percentage, comprises the following components:

[0007] Al: 16%-50%;

[0008] Mg: 0.001%-0.18%;

[0009] Rare earth element RE: 0.01%-0.5%; the rare earth element RE is one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;

[0010] The balance is Zn;

[0011] Percentage refers to the percentage of the mass of each element relative to the mass of the raw material composition.

[0012] In this invention, the mass percentage of Al can be 16%-45%.

[0013] In some specific embodiments, the mass percentage of Al is 16.2%, 18.15%, 18.19%, 23%, 26.39%, 26.41%, 30.91%, 37.3%, 37.4%, 38.32%, or 48.98%.

[0014] In this invention, the mass percentage of Mg can be 0.005%-0.15%.

[0015] In some specific embodiments, the mass percentage of Mg is 0.008%, 0.01%, 0.04%, 0.05%, 0.08%, 0.1%, or 0.12%.

[0016] In this invention, the rare earth element RE is preferably one or more of cerium (Ce), samarium (Sm), yttrium (Y), erbium (Er), and neodymium (Nd), and more preferably one or more of samarium (Sm), yttrium (Y), erbium (Er), and neodymium (Nd).

[0017] In this invention, the mass percentage of the rare earth element RE can be 0.01%-0.2%.

[0018] In some specific embodiments, the mass percentage of the rare earth element RE is 0.03%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.13%, 0.14%, 0.15%, 0.18%, or 0.2%.

[0019] In this invention, the raw material composition may further include Mn and / or Cu.

[0020] The mass percentage of Mn is preferably 0.01%-1.0%, for example 0.25% or 0.98%;

[0021] The mass percentage of Cu is preferably 0-5.0%, but not 0, for example 0.84%, 1.53%, or 3.28%.

[0022] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 16.2%, Mg: 0.01%, Ce: 0.18%, with the balance being Zn.

[0023] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.19%, Mg: 0.008%, Sm: 0.12%, with the balance being Zn.

[0024] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 23.0%, Mg: 0.1%, Y: 0.1%, with the balance being Zn.

[0025] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.39%, Mg: 0.04%, Y: 0.07%, with the balance being Zn.

[0026] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 30.91%, Mg: 0.08%, Er: 0.13%, with the balance being Zn.

[0027] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.3%, Mg: 0.04%, Sm: 0.14%, with the balance being Zn.

[0028] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.4%, Mg: 0.1%, Sm: 0.15%, with the balance being Zn.

[0029] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage, the following components: Al: 48.98%, Mg: 0.12%, Ce: 0.09%, Nd: 0.03%, Cu: 1.53%, with the balance being Zn.

[0030] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.15%, Mg: 0.05%, Sm: 0.2%, Mn: 0.25%, with the balance being Zn.

[0031] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.41%, Mg: 0.04%, Y: 0.08%, Cu: 3.28%, with the balance being Zn.

[0032] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage, the following components: Al: 38.32%, Mg: 0.1%, Er: 0.07%, Mn: 0.98%, Cu: 0.84%, with the balance being Zn.

[0033] In some specific embodiments, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 23.0%, Mg: 0.1%, Ce: 0.1%, with the balance being Zn.

[0034] The present invention also provides a method for preparing a zinc-aluminum rare earth alloy, which includes the following steps: sequentially melting, casting, rolling and drawing the raw material composition of the zinc-aluminum rare earth alloy as described above to obtain the zinc-aluminum rare earth alloy.

[0035] In this invention, the zinc-aluminum rare earth alloy can be in the form of a wire, and the diameter of the wire is preferably Ø1mm-Ø5mm, for example Ø1.6mm.

[0036] In this invention, the casting can be a process of melting the raw material composition and then casting it into a rod, wherein the diameter of the rod is preferably Ø6-Ø20mm, for example Ø15mm.

[0037] In this invention, the melting temperature can be 500-700℃.

[0038] In this invention, the smelting equipment can be conventionally used in the art, such as a medium-frequency or industrial-frequency furnace.

[0039] In this invention, the smelting method may include: first smelting Al and Zn, and then adding an intermediate alloy, wherein the intermediate alloy includes rare earth elements and Mg; preferably, the intermediate alloy further includes Cu and / or Mn.

[0040] The present invention also provides a zinc-aluminum rare earth alloy, which comprises the following components by mass percentage:

[0041] Al: 16%-50%;

[0042] Mg: 0.001-0.18%;

[0043] Rare earth element RE: 0.01-0.5%; the rare earth element RE is one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;

[0044] The balance is Zn;

[0045] The percentage refers to the percentage of the mass of each element relative to the mass of the zinc-aluminum rare earth alloy.

[0046] In this invention, the mass percentage of Al can be 16%-45%.

[0047] In some specific embodiments, the mass percentage of Al is 16.2%, 18.15%, 18.19%, 23%, 26.39%, 26.41%, 30.91%, 37.3%, 37.4%, 38.32%, or 48.98%.

[0048] In this invention, the mass percentage of Mg can be 0.005%-0.15%.

[0049] In some specific embodiments, the mass percentage of Mg is 0.008%, 0.01%, 0.04%, 0.05%, 0.08%, 0.1%, or 0.12%.

[0050] In this invention, the rare earth element RE is preferably one or more of cerium (Ce), samarium (Sm), yttrium (Y), erbium (Er), and neodymium (Nd), and more preferably one or more of samarium (Sm), yttrium (Y), erbium (Er), and neodymium (Nd).

[0051] In this invention, the mass percentage of the rare earth element RE is preferably 0.01%-0.2%.

[0052] In some specific embodiments, the mass percentage of the rare earth element RE is 0.03%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.13%, 0.14%, 0.15%, 0.18%, or 0.2%.

[0053] In this invention, the zinc-aluminum rare earth alloy may further include Mn and / or Cu.

[0054] The mass percentage of Mn is preferably 0.01%-1.0%, for example 0.25% or 0.98%;

[0055] The mass percentage of Cu is preferably 0-5.0%, but not 0, for example 0.84%, 1.53%, or 3.28%.

[0056] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 16.2%, Mg: 0.01%, Ce: 0.18%, with the balance being Zn.

[0057] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.19%, Mg: 0.008%, Sm: 0.12%, with the balance being Zn.

[0058] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 23.0%, Mg: 0.1%, Y: 0.1%, with the balance being Zn.

[0059] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.39%, Mg: 0.04%, Y: 0.07%, with the balance being Zn.

[0060] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 30.91%, Mg: 0.08%, Er: 0.13%, with the balance being Zn.

[0061] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.3%, Mg: 0.04%, Sm: 0.14%, with the balance being Zn.

[0062] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.4%, Mg: 0.1%, Sm: 0.15%, with the balance being Zn.

[0063] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 48.98%, Mg: 0.12%, Ce: 0.09%, Nd: 0.03%, Cu: 1.53%, with the balance being Zn.

[0064] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.15%, Mg: 0.05%, Sm: 0.2%, Mn: 0.25%, with the balance being Zn.

[0065] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.41%, Mg: 0.04%, Y: 0.08%, Cu: 3.28%, with the balance being Zn.

[0066] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 38.32%, Mg: 0.1%, Er: 0.07%, Mn: 0.98%, Cu: 0.84%, with the balance being Zn.

[0067] In some specific embodiments, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 23.0%, Mg: 0.1%, Ce: 0.1%, with the balance being Zn.

[0068] The present invention also provides a zinc-aluminum rare earth alloy, which is prepared according to the preparation method described above.

[0069] The present invention also provides a zinc-aluminum rare earth alloy coating comprising the zinc-aluminum rare earth alloy as described above.

[0070] In this invention, the zinc-aluminum rare earth alloy coating can be applied to the fields of new energy, electronic components, or corrosion protection.

[0071] The present invention also provides an application of the zinc-aluminum rare earth alloy or zinc-aluminum rare earth alloy coating as described above in the fields of new energy, electronic components or corrosion protection.

[0072] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0073] The reagents and raw materials used in this invention are all commercially available.

[0074] The positive and progressive effects of this invention are as follows:

[0075] The zinc-aluminum rare earth alloy provided by this invention, when applied to a coating with a high aluminum content, exhibits good bonding strength with the substrate and excellent corrosion resistance.

[0076] The zinc-aluminum rare earth alloy preparation method provided by this invention has good processing performance and low wire breakage rate. Detailed Implementation

[0077] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0078] Examples 1-12 and Comparative Examples 1-5

[0079] According to the composition in Table 1, alloy materials are prepared, and a certain amount of Al and Zn are added to a 500kg medium-frequency furnace for smelting at a temperature of 500-700℃. Then, intermediate alloy is added. The smelting temperature should be selected so that all components can be melted. After the alloy is smelted, it is continuously cast into a rod with a diameter of Ø15mm, and then made into a wire with a diameter of Ø1.6mm through multiple rolling and drawing processes.

[0080] In Examples 1-7, Example 12, and Comparative Examples 1-4, the master alloy included rare earth elements and Mg;

[0081] In Examples 8 and 10, the master alloy is an alloy of rare earth elements, Mg, and Cu;

[0082] In Example 9, the intermediate alloy comprises an alloy of rare earth elements, Mg, and Mn;

[0083] In Example 11, the intermediate alloy comprises an alloy of rare earth elements, Mg, Cu, and Mn.

[0084] In Comparative Example 5, the intermediate alloy included rare earth elements, Mg, and Si.

[0085] The loss of elements generated during the preparation process is negligible, and the composition in Table 1 is also the composition of the final zinc-aluminum rare earth alloy.

[0086] Table 1

[0087] Implementation Plan Al / % Mg / % Ce / % Sm / % Y / % Er / % Nd / % Mn / % Cu / % Si / % Example 1 16.2 0.01 0.18 / / / / / / / Example 2 18.19 0.008 / 0.12 / / / / / / Example 3 23.0 0.1 / / 0.1 / / / / / Example 4 26.39 0.04 / / 0.07 / / / / / Example 5 30.91 0.08 / / / 0.13 / / / / Example 6 37.3 0.04 / 0.14 / / / / / / Example 7 37.4 0.1 / 0.15 / / / / / / Example 8 48.98 0.12 0.09 / / / 0.03 / 1.53 / Example 9 18.15 0.05 / 0.2 / / / 0.25 / / Example 10 26.41 0.04 / / 0.08 / / / 3.28 / Example 11 38.32 0.1 / / / 0.07 0.98 0.84 Example 12 23.0 0.1 0.1 / / / / / / / Comparative Example 1 16.2 0.01 / / / / / / / / Comparative Example 2 37.3 0.25 / 0.15 / / / / / / Comparative Example 3 18.2 0.25 0.49 / / / / / / / Comparative Example 4 40 2.00 0.03 / . 0.07 / / / / Comparative Example 5 57 4 0.9 / / / 0.1 / / 2.7

[0088] Example 1

[0089] Broken wire rate

[0090] During the preparation of zinc-aluminum rare earth alloys in the examples and comparative examples, the number of wire breaks when 350 kg of Ø15 mm rods were made into Ø1.6 mm wires was counted, and the results are recorded in Table 2.

[0091] Example 2

[0092] The zinc-aluminum rare earth alloys prepared in the examples and comparative examples were sprayed onto Q235 steel plates to prepare coatings. The coating thicknesses are shown in Table 2. The sprayed samples were then tested.

[0093] (1) Bond strength

[0094] The bonding strength of the samples prepared by the above method was tested in accordance with the method for determining the tensile bond strength of thermal spraying in GB / T 8642-2002. The results are recorded in Table 2.

[0095] (2) Corrosion resistance

[0096] The corrosion resistance of the samples prepared by the above method was tested for 1000 hours in accordance with the method of salt spray test in artificial atmosphere corrosion test of GB / T10125-2021. The results are recorded in Table 2.

[0097] Table 2

[0098] Implementation Plan Coating thickness / μm Number of broken wires Bond strength / MPa After 1000 hours of neutral salt spray test Example 1 145 0 17.5 No yellow rust Example 2 143 0 18.4 No yellow rust Example 3 140 0 22.5 No yellow rust Example 4 142 0 20.6 No yellow rust Example 5 145 0 22.1 No yellow rust Example 6 144 0 22.8 No yellow rust Example 7 141 0 23.5 No yellow rust Example 8 140 1 24.6 No yellow rust Example 9 143 0 20.4 No yellow rust Example 10 146 0 21.2 No yellow rust Example 11 144 0 26.5 No yellow rust Example 12 140 0 15.2 No yellow rust Comparative Example 1 143 0 12.3 Extensive yellow rust Comparative Example 2 141 3 22.5 No yellow rust Comparative Example 3 145 5 20.5 No yellow rust Comparative Example 4 146 7 22.9 No yellow rust Comparative Example 5 140 12 24.8 No yellow rust

[0099] The zinc-aluminum rare earth alloy material prepared by this invention has a bonding strength with the matrix that is higher than 15 MPa, and no yellow rust is observed after 1000 hours of neutral salt spray testing. The number of wire breaks during its preparation process is less than 2.

[0100] In Comparative Example 1, no rare earth elements were added, resulting in very low bonding strength with the matrix and poor corrosion resistance. A large amount of yellow rust appeared during the salt spray test.

[0101] The Mg content in Comparative Example 2 is outside the scope of this invention. The Mg and rare earth metal contents in Comparative Example 3 are both outside the scope of this invention. The Mg content in Comparative Example 4 is outside the scope of this invention. The Al, Mg and rare earth metal contents in Comparative Example 5 are all outside the scope of this invention. The number of wire breaks is 3-12 times, which seriously affects the processing performance.

[0102] The only difference between Example 3 and Example 12 is the type of rare earth metal element. According to the effect data in Table 2, the wire breakage frequency test results are all 0 and no yellow rust is generated during the corrosion resistance test. When the rare earth metal is Y, it has a higher bonding strength.

[0103] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A raw material composition for a zinc-aluminum rare earth alloy, characterized in that, It comprises the following components by weight percentage: Al：16%-50%； Mg: 0.001%-0.18%; Rare earth element RE: 0.01%-0.5%; the rare earth element RE is one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; The balance is Zn; Percentage refers to the percentage of the mass of each element relative to the mass of the raw material composition.

2. The raw material composition of the zinc-aluminum rare earth alloy according to claim 1, characterized in that, The mass percentage of Al is 16%-45%, for example 16.2%, 18.15%, 18.19%, 23%, 26.39%, 26.41%, 30.91%, 37.3%, 37.4% or 38.32%; And / or, the mass percentage of Mg is 0.005%-0.15%, for example 0.008%, 0.01%, 0.04%, 0.05%, 0.08%, 0.1% or 0.12%; And / or, the rare earth element RE is one or more of Ce, Sm, Y, Er and Nd, preferably one or more of Sm, Y, Er and Nd; And / or, the mass percentage of the rare earth element RE is 0.01%-0.2%, for example 0.03%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.13%, 0.14%, 0.15%, 0.18% or 0.2%; And / or, the raw material composition further includes Mn and / or Cu; The mass percentage of Mn is preferably 0.01%-1.0%, for example 0.25% or 0.98%; The mass percentage of Cu is preferably 0-5.0%, but not 0, for example 0.84%, 1.53%, or 3.28%.

3. The raw material composition of the zinc-aluminum rare earth alloy according to claim 1, characterized in that, The raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 16.2%, Mg: 0.01%, Ce: 0.18%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 18.19%, Mg: 0.008%, Sm: 0.12%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 23.0%, Mg: 0.1%, Y: 0.1%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 26.39%, Mg: 0.04%, Y: 0.07%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 30.91%, Mg: 0.08%, Er: 0.13%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 37.3%, Mg: 0.04%, Sm: 0.14%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 37.4%, Mg: 0.1%, Sm: 0.15%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 48.98%, Mg: 0.12%, Ce: 0.09%, Nd: 0.03%, Cu: 1.53%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 18.15%, Mg: 0.05%, Sm: 0.2%, Mn: 0.25%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 26.41%, Mg: 0.04%, Y: 0.08%, Cu: 3.28%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy, by mass percentage, comprises the following components: Al: 38.32%, Mg: 0.1%, Er: 0.07%, Mn: 0.98%, Cu: 0.84%, with the balance being Zn; Alternatively, the raw material composition of the zinc-aluminum rare earth alloy comprises, by mass percentage, the following components: Al: 23.0%, Mg: 0.1%, Ce: 0.1%, with the balance being Zn.

4. A method for preparing a zinc-aluminum rare earth alloy, characterized in that, It includes the following steps: sequentially melting, casting, rolling and drawing the raw material composition of the zinc-aluminum rare earth alloy as described in any one of claims 1-3 to obtain the zinc-aluminum rare earth alloy.

5. The method for preparing the zinc-aluminum rare earth alloy as described in claim 4, characterized in that, The zinc-aluminum rare earth alloy is in the form of a wire, and the diameter of the wire is preferably Ø1mm-Ø5mm, for example Ø1.6mm; And / or, the casting is to melt the raw material composition and then cast it into a rod, the diameter of which is preferably Ø6-20mm, for example Ø15mm; And / or, the melting temperature is 500-700°C; And / or, the smelting method includes: first smelting Al and Zn, then adding an intermediate alloy, the intermediate alloy including rare earth elements and Mg; preferably, the intermediate alloy further includes Cu and / or Mn.

6. A zinc-aluminum rare earth alloy, characterized in that, It comprises the following components by weight percentage: Al：16%-50%； Mg: 0.001-0.18%; Rare earth element RE: 0.01-0.5%; the rare earth element RE is one or more of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; The balance is Zn; The percentage refers to the percentage of the mass of each element relative to the mass of the zinc-aluminum rare earth alloy.

7. The zinc-aluminum rare earth alloy according to claim 6, characterized in that, The mass percentage of Al is 16%-45%, for example 16.2%, 18.15%, 18.19%, 23%, 26.39%, 26.41%, 30.91%, 37.3%, 37.4% or 38.32%; And / or, the mass percentage of Mg is 0.005%-0.15%, for example 0.008%, 0.01%, 0.04%, 0.05%, 0.08%, 0.1% or 0.12%; And / or, the rare earth element RE is one or more of Ce, Sm, Y, Er and Nd, preferably one or more of Sm, Y, Er and Nd; And / or, the mass percentage of the rare earth element RE is 0.01%-0.2%, for example 0.03%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.13%, 0.14%, 0.15%, 0.18% or 0.2%; And / or, the zinc-aluminum rare earth alloy further includes Mn and / or Cu; The mass percentage of Mn is preferably 0.01%-1.0%, for example 0.25% or 0.98%; The mass percentage of Cu is preferably 0-5.0%, but not 0, for example 0.84%, 1.53%, or 3.28%.

8. The zinc-aluminum rare earth alloy according to claim 6, characterized in that, The zinc-aluminum rare earth alloy comprises the following components by mass percentage: Al: 16.2%, Mg: 0.01%, Ce: 0.18%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.19%, Mg: 0.008%, Sm: 0.12%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 23.0%, Mg: 0.1%, Y: 0.1%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.39%, Mg: 0.04%, Y: 0.07%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 30.91%, Mg: 0.08%, Er: 0.13%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.3%, Mg: 0.04%, Sm: 0.14%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 37.4%, Mg: 0.1%, Sm: 0.15%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 48.98%, Mg: 0.12%, Ce: 0.09%, Nd: 0.03%, Cu: 1.53%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 18.15%, Mg: 0.05%, Sm: 0.2%, Mn: 0.25%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage: Al: 26.41%, Mg: 0.04%, Y: 0.08%, Cu: 3.28%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage, the following components: Al: 38.32%, Mg: 0.1%, Er: 0.07%, Mn: 0.98%, Cu: 0.84%, with the balance being Zn; Alternatively, the zinc-aluminum rare earth alloy comprises, by mass percentage, the following components: Al: 23.0%, Mg: 0.1%, Ce: 0.1%, with the balance being Zn.

9. A zinc-aluminum rare earth alloy, characterized in that, The zinc-aluminum rare earth alloy is prepared according to the preparation method of zinc-aluminum rare earth alloy as described in claim 4 or 5.

10. A zinc-aluminum rare earth alloy coating, characterized in that, It comprises a zinc-aluminum rare earth alloy as described in any one of claims 6-9, preferably, the zinc-aluminum rare earth alloy coating is applied in the fields of new energy, electronic components or corrosion protection.