阅读说明：本技术 一种可阳极氧化的铝锂合金及其制备方法 (Aluminum lithium alloy capable of being anodized and preparation method thereof ) 是由 肖阳 刘振杰 马凯杰 祁登科 刘志鹏 王松森 解海涛 于 2020-12-31 设计创作，主要内容包括：本发明属于有色金属材料及其热加工领域,具体涉及一种可阳极氧化的铝锂合金及其制备方法。本发明通过优化铝锂合金中Li元素等合金元素的种类及含量,并结合特定的加工变形工艺和热处理方式,调整阳极氧化工序,将Li原子完全固溶进入Al基体内,消除传统铝锂合金内部含Li相与Al基体之间存在的电极电位差,使得合金可以进行阳极氧化,制备出均匀连续致密的氧化膜层,并进行染色处理,色彩均匀美观,之后自然时效析出相可提高合金力学性能。本发明通过调控合金元素配比以及存在形式,利用现有各种熔铸、加工、热处理、阳极氧化等设备,以及常规阳极氧化液就可以进行合金制备与阳极氧化,可快速投入工业化生产。(The invention belongs to the field of non-ferrous metal materials and hot working thereof, and particularly relates to an anodizable aluminum-lithium alloy and a preparation method thereof. According to the invention, by optimizing the types and contents of alloy elements such as Li element in the aluminum lithium alloy and combining a specific processing deformation process and a specific heat treatment mode, the anodic oxidation process is adjusted, Li atoms are completely dissolved into an Al matrix in a solid solution manner, and the electrode potential difference existing between the Li-containing phase and the Al matrix in the traditional aluminum lithium alloy is eliminated, so that the alloy can be subjected to anodic oxidation, a uniform, continuous and compact oxidation film layer is prepared, and dyeing treatment is carried out, the color is uniform and attractive, and then the mechanical property of the alloy can be improved by natural aging precipitation of the phase. The invention can carry out alloy preparation and anodic oxidation by regulating and controlling the proportion and the existing form of alloy elements and utilizing the existing various casting, processing, heat treatment, anodic oxidation and other equipment and the conventional anodic oxidation liquid, and can be rapidly put into industrial production.)

1. An anodizable aluminum lithium alloy is characterized by mainly comprising the following components in percentage by mass: li: 2.0-4.5%, Co: 0.05-0.4%, Cr: 0.05-0.4%, Mn: 0.05 to 0.5%, Zr: 0.05-0.3%, Sc: 0.05-0.3%, and the balance of Al.

2. The anodizable aluminum lithium alloy of claim 1 consisting essentially of, by mass: li 2.5-3.0%, Co: 0.05-0.3%, Cr: 0.1-0.2%, Mn: 0.05-0.3 percent of Zr, 0.1-0.2 percent of Sc and the balance of Al.

3. The method of making an anodizable aluminum lithium alloy of claim 1, comprising the steps of:

(1) smelting and ingot casting: preparing materials according to the mass percentage of each component in the alloy, and preparing an alloy ingot by adopting a vacuum melting mode after the materials are prepared;

(2) preparing a plate blank: homogenizing the alloy ingot in the step (1); preparing a slab from the homogenized alloy ingot by adopting a hot extrusion mode to obtain an aluminum-lithium alloy slab;

(3) isothermal rolling: carrying out isothermal rolling on the aluminum lithium alloy plate blank treated in the step (2) to obtain an aluminum lithium alloy sheet;

(4) solid solution and anodic oxidation treatment: and (4) carrying out solution treatment on the aluminum lithium alloy sheet obtained in the step (3), carrying out anodic oxidation treatment on the aluminum lithium alloy sheet after the solution treatment, dyeing, and sealing holes to obtain the product.

4. The method as claimed in claim 3, wherein the homogenization treatment temperature in step (2) is 450-550 ℃, and the temperature is maintained for 12-24h, and then the homogenization treatment temperature is cooled to room temperature along with the furnace; the hot extrusion temperature of the step (2) is 400-.

5. The preparation method according to claim 3, wherein the isothermal rolling temperature in the step (3) is 300-.

6. The preparation method as claimed in claim 3, wherein the solution treatment temperature in step (4) is 460-550 ℃, the holding time is 1-3h, and the solution is cooled to room temperature.

7. The production method according to claim 3, wherein the anodizing electrolyte in the step (4) is a boric acid-sulfuric acid solution in which H is₂SO₄The concentration is 40-60g/L, H₂BO₃The concentration is 4-10 g/L.

8. The preparation method according to claim 3, wherein the anodic oxidation treatment in the step (4) uses a DC stabilized power supply, and the temperature during electrolysis is 15-30 ℃, the voltage (15 +/-1) V, and the time is 15-30 min.

9. The preparation method according to claim 3, wherein the dyeing in the step (4) is that the anodized aluminum lithium alloy sheet is immersed in a dye solution for standing and dyeing, the immersion time is 5-15min, and the temperature of the dye solution is 30-60 ℃.

10. The preparation method according to claim 3, wherein the hole sealing in the step (4) is to put the dyed aluminum-lithium alloy sheet into distilled water or deionized water at 95-100 ℃, soak and heat for 15-25min, and seal the surface pores.

Technical Field

The invention belongs to the field of non-ferrous metal materials and hot working thereof, and particularly relates to an anodizable aluminum-lithium alloy and a preparation method thereof.

Background

The aluminum-lithium alloy is an advanced lightweight structural material, is developed particularly rapidly in aerospace materials in recent years, has a plurality of excellent comprehensive properties such as low density, high specific strength and specific stiffness, high elastic modulus, low fatigue crack propagation rate, good low-temperature performance, excellent superplastic forming performance and the like, and can reduce the structural mass by 10-20% and improve the stiffness by 15-20% by replacing the conventional high-strength aluminum alloy. Therefore, the aluminum lithium alloy has wide application prospect in the fields of aerospace and civil 3C.

The anodic oxidation is one of the most common aluminum alloy surface treatment modes, the prior art usually directly uses the aging state or annealing state aluminum alloy as an anode, and forms a layer of compact oxide film on the alloy surface by an external electric field according to the electrolysis principle to carry out the anodic oxidation, thereby improving the surface hardness of the aluminum alloy. In addition, other properties of the aluminum alloy surface, including chemical stability, corrosion resistance, insulation, and adsorbability, are significantly improved by anodization. The adsorbability is improved, so that various dyes can be adsorbed on the surface of the aluminum material, various colors can be dyed, surface decoration is carried out, and the aluminum material is widely applied to the fields of aerospace, civil 3C and the like.

The addition of Li can effectively reduce the density of the aluminum alloy, and can form Al3Li strengthening phase to improve the mechanical property of the alloy. When Cu, Mg, Ag and other elements are added into the Al-Li alloy, different elements interact with each other to form a plurality of Li-containing second phases, so that the comprehensive mechanical property of the alloy is effectively improved, but the Li-containing second phases and an Al matrix phase have larger electrode potential difference, so that the corrosion resistance of the alloy is weaker, in addition, in the process of carrying out anodic oxidation by using the conventional working procedure, point-shaped or linear defects can be caused due to excessive local corrosion on the surface of the aging-state or annealing-state aluminum-lithium alloy, so that a uniform and compact anodic oxidation layer cannot be formed, the color is not uniform during subsequent dyeing, the appearance is seriously influenced, and the application of the aluminum-lithium alloy in related fields is hindered.

Chinese patent publication No. CN 110965104A discloses a normal-temperature sealing treatment method of an Al-Cu-Li alloy anodic oxide film, which is an implementation method for sealing the Al-Cu-Li alloy anodic oxide film at normal temperature by using a layered double-hydroxide metal oxide, wherein the Al-Cu-Li alloy is pretreated by polishing and the like, is subjected to anodic oxidation treatment by using acid liquor, is then put into 0.05-0.1M lithium carbonate aqueous solution, is kept at constant temperature for 30-180 min at the temperature of 25-30 ℃ in an atmospheric environment, is taken out and is washed by deionized water, and is dried, so that the normal-temperature sealing of the Al-Cu-Li alloy anodic oxide film is realized. Although the method disclosed by the patent has a sealing effect on holes of an Al-Cu-Li alloy anodic oxide film and improves the corrosion resistance of the alloy surface, the inventor finds that the method does not solve the problems that the electrode potential difference of a Li-containing phase and an Al matrix phase is large in the anodic oxidation process of the aluminum-lithium alloy and the defect is caused by excessive local corrosion, and the prepared anodic oxide film has poor compactness and insufficient wear resistance and cannot be dyed effectively.

Disclosure of Invention

Aiming at the application limitation of the aluminum lithium alloy in the aspects of anodic oxidation and dyeing, the invention provides an anodizable aluminum lithium alloy, which is characterized in that the types and the contents of alloy elements such as Li element and the like in the aluminum lithium alloy are optimized, a specific processing deformation process and a specific heat treatment mode are combined, the anodic oxidation process is adjusted, Li atoms are completely dissolved into an Al matrix in a solid solution manner, the electrode potential difference existing between the Li-containing phase in the traditional aluminum lithium alloy and the Al matrix is eliminated, the alloy can be subjected to anodic oxidation, a uniform, continuous and compact oxidation film layer is prepared and is subjected to dyeing treatment, the color is uniform and attractive, and the mechanical property of the alloy can be improved by natural aging precipitation of the phase.

The invention also provides a preparation method of the anodizable aluminum lithium alloy.

Based on the purpose, the invention adopts the following technical scheme:

an anodizable aluminum lithium alloy mainly comprises the following components in percentage by mass: li: 2.0-4.5%, Co: 0.05-0.4%, Cr: 0.05-0.4%, Mn: 0.05 to 0.5%, Zr: 0.05-0.3%, Sc: 0.05-0.3 percent, the balance of Al, and impurity elements less than or equal to 0.1 percent.

Further, the anodizable aluminum lithium alloy comprises the following components in percentage by mass: li 2.5-3.0%, Co: 0.05-0.3%, Cr: 0.1-0.2%, Mn: 0.05-0.3 percent of Zr, 0.1-0.2 percent of Sc, the balance of Al, and impurity elements less than or equal to 0.1 percent.

Preferably, the anodizable aluminum lithium alloy consists of the following components in percentage by mass: li 2.5%, Co: 0.05-0.3%, Cr: 0.1-0.2%, Mn: 0.05-0.3 percent of Zr, 0.1-0.2 percent of Sc, the balance of Al, and impurity elements less than or equal to 0.1 percent.

The impurity elements are one or more of Cu, Mg, Zn, Fe, Si, Na and Ti.

A method for preparing an anodizable aluminum lithium alloy, which comprises the following steps:

(1) smelting and ingot casting: preparing materials according to the mass percentage of each component in the alloy, and preparing an alloy ingot by adopting a vacuum melting mode after the materials are prepared;

(2) preparing a plate blank: homogenizing the alloy ingot in the step (1), reducing structure segregation and eliminating internal stress; preparing a slab from the homogenized alloy ingot by adopting a hot extrusion mode to obtain an aluminum-lithium alloy slab;

(3) isothermal rolling: carrying out isothermal rolling on the aluminum lithium alloy plate blank treated in the step (2) to obtain an aluminum lithium alloy sheet;

(4) solid solution and anodic oxidation treatment: and (4) carrying out solution treatment on the aluminum lithium alloy sheet obtained in the step (3), carrying out anodic oxidation treatment on the aluminum lithium alloy sheet after the solution treatment, dyeing, and sealing holes to obtain the product.

Specifically, the homogenization treatment temperature in the step (2) is 450-550 ℃, the heat preservation is carried out for 12-24h, and then the temperature is cooled to the room temperature along with the furnace.

Specifically, the hot extrusion temperature in the step (2) is 400-500 ℃, and the extrusion speed is 1-3 m/min.

Specifically, in the step (3), the isothermal rolling temperature is 300-.

Specifically, the solution treatment temperature in the step (4) is 460-550 ℃, the heat preservation time is 1-3h, and the temperature is cooled to the room temperature.

Specifically, the anodic oxidation electrolyte in the step (4) is a boric acid-sulfuric acid solution, wherein H is₂SO₄The concentration is 40-60g/L, H₂BO₃The concentration is 4-10 g/L.

Specifically, in the step (4), a direct-current stabilized power supply is used for the anodic oxidation treatment, the temperature during electrolysis is 15-30 ℃, the voltage is (15 +/-1) V, and the time is 15-30 min.

Specifically, the dyeing in the step (4) is to immerse the anodized aluminum-lithium alloy sheet into dye solution for standing and dyeing, wherein the soaking time is 5-15min, and the temperature of the dye solution is 30-60 ℃.

Specifically, the hole sealing in the step (4) is to put the dyed aluminum lithium alloy sheet into distilled water or deionized water at the temperature of 95-100 ℃, soak and heat for 15-25min, and seal the surface pores.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the Li content is regulated and controlled, and the Li is completely dissolved into the Al matrix through solution treatment, so that the potential difference between the Li-containing phase in the alloy and the Al matrix electrode is eliminated, the anode oxidation treatment and the dyeing treatment can be effectively carried out on the aluminum-lithium alloy, the finally prepared oxide film is uniform and compact, the normal dyeing of various colors such as light color, deep color and the like can be carried out, and the wear resistance and the durability are high in the using process.

2. After the anode-oxidizable aluminum lithium alloy is added with Li element with the designed content, the density of the alloy is reduced by about 10 percent, and the comprehensive mechanical property of the alloy is improved through the solid solution strengthening and the aging strengthening formed by subsequent natural aging, wherein the tensile strength reaches 240-280MPa, the yield strength reaches 180-240MPa, and the elongation reaches 12-20 percent.

3. According to the anodizable aluminum lithium alloy and the preparation method thereof, the alloy preparation and the anodic oxidation can be carried out by regulating the proportion and the existence form of alloy elements and utilizing the existing various casting, processing, heat treatment, anodic oxidation and other equipment and the conventional anodic oxidation liquid, and the anodizable aluminum lithium alloy can be rapidly put into industrial production.

Drawings

FIG. 1 is a photograph of the as-cast metallographic structure of the anodizable aluminum lithium alloy of example 1;

FIG. 2 is a photograph of the metallographic structure of an extruded plate blank made of an anodizable aluminum lithium alloy in example 1;

FIG. 3 is a black photograph of an anodically oxidized and colored thin anodically oxidizable aluminum lithium alloy sheet of example 1;

FIG. 4 is a photograph of an anodized and colored blue color of the anodizable aluminum lithium alloy sheet of example 2;

FIG. 5 is a photograph of an anodically oxidized and colored red color of the anodically oxidizable aluminum lithium alloy sheet of example 3.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The raw materials used in the following examples are all common commercial products.

Specifically, the following examples used the raw materials: high-purity Al, metallic Li simple substance, Al-Co, Al-Cr, Al-Mn, Al-Sc and Al-Zr intermediate alloy; the method of vacuum melting in the following examples adopts the method in patent literature (CN 110106415A a fluxless vacuum casting high purity magnesium alloy and its preparation method).

Example 1

An anodizable aluminum lithium alloy mainly comprises the following components in percentage by mass: li: 2.5%, Co: 0.2%, Cr: 0.05%, Mn: 0.3%, Sc: 0.2%, Zr: 0.2 percent of Al and less than or equal to 0.1 percent of impurity elements, wherein the impurity elements are Cu, Mg, Zn, Fe, Si, Na and Ti.

The preparation method of the anodizable aluminum-lithium alloy comprises four stages of vacuum melting, plate blank preparation, isothermal rolling, solid solution and anodizing treatment, and specifically comprises the following steps:

(1) smelting and ingot casting: preparing materials according to the mass percentage of each component in the alloy, and preparing an alloy ingot by adopting a vacuum melting mode after the materials are prepared;

(2) preparing a plate blank: preserving the heat of the alloy ingot in the step (1) at 460 ℃ for 16h for homogenization treatment, and then cooling the alloy ingot to room temperature along with the furnace; turning the surface of the homogenized alloy ingot casting to be clean and free of defects, and preparing a plate blank in a hot extrusion mode to obtain an aluminum-lithium alloy plate blank with the thickness of 6mm, wherein the extrusion temperature is 400 ℃, and the extrusion speed is 3 m/min;

(3) isothermal rolling: keeping the temperature of the aluminum lithium alloy plate blank treated in the step (2) at 400 ℃ for 60min, and carrying out isothermal rolling to obtain an aluminum lithium alloy sheet with the thickness of 1.2 mm; the single-pass deformation is 15% during isothermal rolling, tempering is carried out when the thickness of the aluminum-lithium alloy plate blank reaches 2.5mm in the isothermal rolling process, the tempering temperature is 400 ℃, and the tempering time is 10 min;

(4) solid solution and anodic oxidation treatment: carrying out solution treatment on the aluminum lithium alloy sheet with the thickness of 1.2mm obtained in the step (3), wherein the solution temperature is 460 ℃, the heat preservation time is 1h, and the aluminum lithium alloy sheet is subjected to air quenching at room temperature and is cooled;

polishing the surface of the aluminum-lithium alloy sheet subjected to solution treatment to remove oil, and then putting the aluminum-lithium alloy sheet into anodic oxidation electrolyte for anodic oxidation treatment, wherein H in the electrolyte (boric acid-sulfuric acid solution)₂SO₄The concentration is 45g/L, H₂BO₃The concentration is 6g/L, the temperature of the electrolyte solution is 20 ℃, a direct-current stabilized power supply is adopted during electrolysis, the voltage is 15V, and the anode oxidation treatment is carried out after the voltage is kept for 20 min;

washing the anodized aluminum-lithium alloy sheet with water, then putting the sheet into a BLACK dye (model: TAC BLACK BLH 411) solution for BLACK dyeing, soaking the sheet at the temperature of 40 ℃ for 6min, taking out the sheet and washing the sheet with water to finish dyeing;

and (3) putting the dyed aluminum lithium alloy sheet into deionized water at 95 ℃ for heating for 20min for hole sealing, sealing surface holes, and finally obtaining an anodizable aluminum lithium alloy sheet product with the thickness of black 1.2mm, wherein the oxide film layer of the prepared product is uniform and compact, and the dyed black color is uniform and good in glossiness.

FIG. 1 is a photograph of the as-cast metallographic structure of the anodizable aluminum lithium alloy of example 1, from which it can be seen that: mainly exists in dendritic crystal and distributes black second phase along grain boundary;

FIG. 2 is a photograph of the metallographic structure of an extruded plate blank of the anodizable aluminum lithium alloy of example 1, from which it can be seen that: mainly exists in isometric crystal, and the black second phase is reduced;

FIG. 3 is a photograph of an anodized and colored black colored sheet of the anodizable aluminum lithium alloy of example 1, from which it can be seen that: the color is uniform and beautiful.

Example 2

An anodizable aluminum lithium alloy mainly comprises the following components in percentage by mass: li: 3.5%, Co: 0.1%, Cr: 0.1%, Mn: 0.3%, Sc: 0.2%, Zr: 0.2 percent of Al and less than or equal to 0.1 percent of impurity elements, wherein the impurity elements are Cu, Mg, Zn and Fe.

The preparation method of the anodizable aluminum-lithium alloy comprises four stages of vacuum melting, plate blank preparation, isothermal rolling, solid solution and anodizing treatment, and specifically comprises the following steps:

(1) smelting and ingot casting: preparing materials according to the mass percentage of each component in the alloy, and preparing an alloy ingot by adopting a vacuum melting mode after the materials are prepared;

(2) preparing a plate blank: preserving the heat of the alloy ingot in the step (1) at 550 ℃ for 16h for homogenization treatment, and then cooling the alloy ingot to room temperature along with the furnace; turning the surface of the homogenized alloy ingot casting to be clean and free of defects, and preparing a plate blank in a hot extrusion mode to obtain an aluminum-lithium alloy plate blank with the thickness of 6mm, wherein the extrusion temperature is 430 ℃ and the extrusion speed is 3 m/min;

(3) isothermal rolling: keeping the temperature of the aluminum lithium alloy plate blank treated in the step (2) at 450 ℃ for 60min, and carrying out isothermal rolling to obtain an aluminum lithium alloy sheet with the thickness of 1.2 mm; the single-pass deformation is 15% during isothermal rolling, tempering is carried out when the thickness of the aluminum-lithium alloy plate blank reaches 2.5mm in the isothermal rolling process, the tempering temperature is 450 ℃, and the tempering time is 10 min;

(4) solid solution and anodic oxidation treatment: carrying out solution treatment on the aluminum lithium alloy sheet with the thickness of 1.2mm obtained in the step (3), wherein the solution temperature is 560 ℃, the heat preservation time is 2h, and the aluminum lithium alloy sheet is subjected to air quenching at room temperature and is cooled;

polishing the surface of the aluminum-lithium alloy sheet subjected to solution treatment to remove oil, and then putting the aluminum-lithium alloy sheet into anodic oxidation electrolyte for anodic oxidation treatment, wherein H in the electrolyte (boric acid-sulfuric acid solution)₂SO₄The concentration is 45g/L, H₂BO₃The concentration is 6g/L, the temperature of the electrolyte solution is 20 ℃, a direct-current stabilized power supply is adopted during electrolysis, the voltage is 15V, and the anode oxidation treatment is carried out after the voltage is kept for 20 min;

washing the anodized aluminum-lithium alloy sheet with water, then putting the sheet into a blue dye (model: TAC SKYBLUE GLH 502) solution for blue dyeing, soaking the sheet at the temperature of 40 ℃ for 6min, taking out the sheet and washing the sheet with water to finish dyeing;

and (3) putting the dyed aluminum lithium alloy sheet into deionized water at 95 ℃ for heating for 20min for hole sealing, and sealing surface pores to finally obtain a blue aluminum lithium alloy sheet product with the thickness of 1.2mm and capable of being anodized. The prepared product has uniform and compact oxide film layer, uniform blue color after dyeing and good glossiness.

FIG. 4 is a photograph of an anodized and colored blue version of the anodizable aluminum lithium alloy sheet of example 2, showing that: the color is uniform and beautiful.

Example 3

An anodizable aluminum lithium alloy mainly comprises the following components in percentage by mass: li: 3.0%, Co: 0.2%, Cr: 0.1%, Mn: 0.3%, Sc: 0.15%, Zr: 0.15 percent of Al and less than or equal to 0.1 percent of impurity elements, wherein the impurity elements are Cu, Mg, Zn and Fe.

The preparation method of the anodizable aluminum-lithium alloy comprises four stages of vacuum melting, plate blank preparation, isothermal rolling, solid solution and anodizing treatment, and specifically comprises the following steps:

(1) smelting and ingot casting: preparing materials according to the mass percentage of each component in the alloy, and preparing an alloy ingot by adopting a vacuum melting mode after the materials are prepared;

(2) preparing a plate blank: preserving the heat of the alloy ingot in the step (1) at 520 ℃ for 16h for homogenization treatment, and then cooling the alloy ingot to room temperature along with the furnace; turning the surface of the homogenized alloy ingot casting to be clean and free of defects, and preparing a plate blank in a hot extrusion mode to obtain an aluminum-lithium alloy plate blank with the thickness of 6mm, wherein the extrusion temperature is 450 ℃ and the extrusion speed is 2 m/min;

(3) isothermal rolling: keeping the temperature of the aluminum lithium alloy plate blank treated in the step (2) at 350 ℃ for 60min, and carrying out isothermal rolling to obtain an aluminum lithium alloy sheet with the thickness of 0.8 mm; the single-pass deformation is 15% during isothermal rolling, tempering is carried out when the thickness of the aluminum-lithium alloy plate blank reaches 2.5mm in the isothermal rolling process, the tempering temperature is 350 ℃, and the tempering time is 10 min;

(4) solid solution and anodic oxidation treatment: carrying out solution treatment on the aluminum lithium alloy sheet with the thickness of 0.8mm obtained in the step (3), wherein the solution temperature is 530 ℃, the heat preservation time is 2h, and the aluminum lithium alloy sheet is subjected to air quenching at room temperature and is cooled;

polishing the surface of the aluminum-lithium alloy sheet subjected to solution treatment to remove oil, and then putting the aluminum-lithium alloy sheet into anodic oxidation electrolyte for anodic oxidation treatment, wherein H in the electrolyte (boric acid-sulfuric acid solution)₂SO₄The concentration is 45g/L, H₂BO₃The concentration is 6g/L, the temperature of the electrolyte solution is 20 ℃, a direct-current stabilized power supply is adopted during electrolysis, the voltage is 15V, and the anode oxidation treatment is carried out after the voltage is kept for 20 min;

washing the anodized aluminum-lithium alloy sheet with water, then placing the sheet into a red dye (model: TAC FIREY RED GBM 105) solution for red dyeing, soaking the sheet at 40 ℃ for 6min, taking out the sheet and washing the sheet with water to finish dyeing;

and (3) putting the dyed aluminum lithium alloy sheet into deionized water at 95 ℃ for heating for 20min for hole sealing, and sealing the surface pores to finally obtain an anodized aluminum lithium alloy sheet product with the red thickness of 0.8 mm. The prepared product has uniform and compact oxide film layer, uniform red color after dyeing and good glossiness.

FIG. 5 is a photograph of an anodized and colored red colored sheet of the anodizable aluminum lithium alloy of example 3, showing that: the color is uniform and beautiful.

Performance testing

According to the test method of part 1 of the metal material tensile test in the national standard GB/T228.1-2010: mechanical properties of the anodizable aluminum lithium alloy prepared in the embodiments 1 to 3 were measured by a room temperature test method, and the room temperature tensile properties were measured as shown in table 1.

Table 1.

It can be seen from table 1 that the anodized aluminum-lithium alloy sheet prepared in the embodiments 1-3 of the present invention has good mechanical properties such as tensile strength, yield strength and elongation, wherein the tensile strength reaches 240-. The preparation method can effectively carry out anodic oxidation treatment and dyeing treatment on the aluminum-lithium alloy, the finally prepared oxide film is uniform and compact, normal dyeing of various colors such as light color, dark color and the like can be carried out, and the aluminum-lithium alloy has high wear resistance and good durability in the using process.

While specific embodiments of the present invention have been described above, it should be understood that the present invention is not limited to the specific embodiments described above. Various changes or modifications may be made by those skilled in the art within the scope of the claims without departing from the spirit of the invention.