Layered composite of titanium-aluminum-vanadium corrosion-resistant layer and steel material, and preparation method and application thereof

Abstract

This invention belongs to the technical field of titanium-steel composite plates, specifically relating to a layered composite material of titanium-aluminum-vanadium (TiAvanadium) corrosion-resistant layer and steel, its preparation method, and its application. The preparation method includes the following steps: 1) preparing TiAvanadium powder for cold spraying, wherein the TiAvanadium powder comprises the following components by weight percentage: 5.5–6.5% aluminum, 3.5–4.5% vanadium, and the balance being titanium; 2) drying and sieving the TiAvanadium powder obtained in step 1); 3) using the TiAvanadium powder as material, preparing a TiAvanadium corrosion-resistant layer on steel by cold spraying, thus obtaining a composite material; 4) subjecting the obtained composite material to preheating, rolling, and annealing sequentially to obtain a layered composite material of TiAvanadium corrosion-resistant layer and steel. This invention provides a preparation method without size limitations, vacuum limitations, continuous production capability, interfacial metallurgical bonding, and high interfacial bonding strength, which can overcome the problems of complex preparation methods and severe interfacial oxidation in traditional composite plate preparation methods.

Description

Technical Field

[0001] This invention belongs to the technical field of titanium-steel composite plates, specifically relating to a layered composite material of titanium-aluminum-vanadium corrosion-resistant layer and steel, its preparation method and application. Background Technology

[0002] Titanium-steel composite plates possess excellent corrosion resistance and good mechanical properties. Using titanium-steel composite plates to replace titanium plates can save titanium resources and significantly reduce operating costs, making them promising for applications in aerospace, machinery, shipbuilding, and nuclear power. In the petrochemical industry, with the increasing size and extreme service conditions of equipment in recent years, traditional carbon steel pressure vessels can no longer meet the requirements for safe operation. Replacing traditional carbon steel with corrosion-resistant alloys or titanium alloys outright would require too large an initial investment. Therefore, addressing the issues of poor corrosion resistance in existing carbon steel pressure vessels and the excessively high cost of new corrosion-resistant alloy pressure vessels, developing a layered composite material with an inner lining of corrosion-resistant alloy and an outer layer of carbon steel is of great significance for economically solving corrosion problems and improving the long-term operational capability of chemical equipment.

[0003] Currently, titanium-steel composite plates are mainly produced using methods such as explosive welding, explosive-rolling, and vacuum sealing-rolling. These methods often result in severe interfacial oxidation, frequently leading to oxide inclusions at the interface of the layered composite material, causing insufficient bonding and interfacial defects. Furthermore, explosive bonding methods have stringent environmental requirements, while rolling bonding demands sophisticated equipment. Therefore, there is an urgent need for a green, environmentally friendly, and simple method for preparing composite plates.

[0004] This application aims to provide a method for preparing titanium-steel composite plates that is not limited by size or vacuum, can be continuously produced, and has a high interfacial metallurgical bond and interfacial bonding strength. This method changes the problems of complex preparation methods and severe interfacial oxidation in traditional composite plate preparation methods. This not only greatly saves manpower, material resources and financial resources, but also ensures the safe operation of glacial acetic acid distillation towers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a layered composite material of titanium-aluminum-vanadium corrosion-resistant layer and steel, its preparation method, and its applications. This invention provides a method for preparing titanium-steel composite plates that is not limited by size or vacuum, allows for continuous production, exhibits interfacial metallurgical bonding, and boasts high interfacial bonding strength. This method overcomes the problems of complex preparation methods and severe interfacial oxidation associated with traditional composite plate preparation methods.

[0006] The technical solution provided by this invention is as follows:

[0007] A method for preparing a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel includes the following steps:

[0008] 1) Prepare titanium aluminum vanadium powder for cold spraying, wherein the titanium aluminum vanadium powder comprises the following components in weight percentage: 5.5-6.5% aluminum, 3.5-4.5% vanadium, and the balance being titanium;

[0009] 2) Dry and sieve the titanium aluminum vanadium powder obtained in step 1);

[0010] 3) Using titanium aluminum vanadium powder as material, a titanium aluminum vanadium corrosion-resistant layer is prepared by cold spraying onto steel to obtain a composite material;

[0011] 4) The obtained composite material is preheated, rolled and annealed in sequence to obtain a layered composite material of titanium aluminum vanadium corrosion resistant layer and steel.

[0012] The above technical solution prepares the titanium-aluminum-vanadium corrosion-resistant layer by cold spraying and further improves the interfacial bonding ability of the layered composite material by hot rolling.

[0013] The above-mentioned technical solution is used to prepare a layered composite material of titanium aluminum vanadium corrosion resistant layer and steel. There are no size restrictions or vacuum restrictions, and continuous production is possible. The resulting composite plate achieves metallurgical bonding between dissimilar metals at the interface, with a tight interface free of oxidation defects and high interfacial bonding strength.

[0014] Specifically, in step 1): a spray granulation method is used, with polyvinyl alcohol (PVA) as the binder and water as the solvent, to granulate the titanium aluminum vanadium raw material to obtain titanium aluminum vanadium powder with a particle size of 20-80 μm and a roundness of 0.6-1.0.

[0015] Preferably, in step 1), the titanium aluminum vanadium powder comprises the following components in weight percentage: 6% aluminum, 4% vanadium, and the balance being titanium, i.e., Ti-6Al-4V.

[0016] Specifically, in step 2): the titanium aluminum vanadium powder is baked in a drying oven at 100-120°C for 1.5-2 hours and then sieved through a 300-800 mesh sieve.

[0017] Specifically, in step 3), the conditions for cold spraying are: acceleration air pressure 4.4-4.6 MPa, powder feeding air pressure 4.8-5.0 MPa, powder feeding rate 45-55 g / min, gas temperature 750-850℃, and the thickness of the titanium-aluminum-vanadium corrosion-resistant layer is 4-4.2 mm.

[0018] Specifically, in step 4), the preheating time is 4 to 6 minutes and the preheating temperature is 950 to 1050℃.

[0019] Specifically, in step 4), the rolling passes are 1 to 3, and the rolling amount is 50 to 65%.

[0020] Specifically, in step 4), the annealing temperature is 550–575℃ and the annealing time is 3–4.5 h.

[0021] Specifically, the steel is carbon steel or stainless steel, optionally Q235 or Q345 carbon steel, or 316L or 304 austenitic stainless steel. Preferably, the steel is Q345 steel.

[0022] The present invention also provides a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel prepared according to the above preparation method.

[0023] Based on the above technical solution, the prepared Ti-6Al-4V and Q345 steel composite plate has a tensile strength of 662MPa, a shear strength of 363MPa, and an elongation of 14%.

[0024] The present invention also provides the application of a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel for the preparation of tower body material for glacial acetic acid distillation tower.

[0025] Based on the above technical solution, the titanium-aluminum-vanadium corrosion-resistant layer can be used as a steel lining for the tower body plates of glacial acetic acid distillation towers.

[0026] The beneficial effects of this invention are:

[0027] 1) The preparation method provided by this invention has no size limitations, no vacuum limitations, and can be used for continuous production;

[0028] 2) The layered composite material of titanium aluminum vanadium corrosion resistant layer and steel provided by the present invention achieves metallurgical bonding between heterogeneous metals at the interface, with a tight interface free of oxidation defects and high interfacial bonding force.

[0029] 3) The technical solution of the present invention is green, environmentally friendly, simple and easy to implement, and has lower requirements for the environment and equipment. Attached Figure Description

[0030] Figure 1 This image shows the morphology of the gas-atomized powder of the titanium-aluminum-vanadium corrosion-resistant coating.

[0031] Figure 2 This is an electron microscope image of the end face of a layered composite material consisting of a titanium-aluminum-vanadium corrosion-resistant layer and steel.

[0032] Figure 3 Electron micrograph of the titanium aluminum vanadium corrosion-resistant layer, which is a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel.

[0033] Figure 4 This is a metallographic photograph of the titanium-aluminum-vanadium corrosion-resistant layer.

[0034] Figure 5 Metallographic image of Q345 carbon steel. Detailed Implementation

[0035] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0036] Unless otherwise specified, the test methods used in the embodiments of this invention are conventional methods; unless otherwise specified, the materials and reagents used are commercially available.

[0037] In one specific implementation:

[0038] The preparation method of the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel includes the following steps:

[0039] 1) Prepare titanium aluminum vanadium powder for cold spraying, wherein the titanium aluminum vanadium powder comprises the following components in weight percentage: 5.5-6.5% aluminum, 3.5-4.5% vanadium, and the balance being titanium;

[0040] 2) Dry and sieve the titanium aluminum vanadium powder obtained in step 1);

[0041] 3) Using titanium aluminum vanadium powder as material, a titanium aluminum vanadium corrosion-resistant layer is prepared by cold spraying onto steel to obtain a composite material;

[0042] 4) The obtained composite material is preheated, rolled and annealed in sequence to obtain a layered composite material of titanium aluminum vanadium corrosion resistant layer and steel.

[0043] Example 1

[0044] The preparation method of the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel specifically includes the following steps:

[0045] 1) Spray granulation of Ti-6Al-4V particles:

[0046] Commercially available Ti-6Al-4V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-6Al-4V powder was placed in a drying oven and baked at 110°C for 2 hours to remove moisture. It was then sieved through 300, 500, and 800 mesh sieves to ensure good flowability. The dried and sieved Ti-6Al-4V was placed into a powder feeding container and then sealed.

[0047] 2) Cold spraying of Ti-6Al-4V lining:

[0048] The cold spraying process for the Ti-6Al-4V / Q345 titanium steel composite plate is as follows: accelerating air pressure 4.5MPa, powder feeding air pressure 4.9MPa, powder feeding rate 50g / min, gas temperature 800℃, and the thickness of the Ti-6Al-4V deposition layer is approximately 4.1mm.

[0049] When the Ti-6Al-4V deposition layer reaches a thickness of approximately 4.1 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0050] 3) Rolling and heat treatment process of Ti-6Al-4V / Q345 titanium steel composite plate:

[0051] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 5 minutes at 1000℃. The heated sample was then rolled in a rolling mill in three passes, with a reduction of 60%. After rolling, the titanium-steel composite slab was annealed at 570℃ for 3 hours. The prepared Ti-6Al-4V / Q345 titanium-steel composite slab exhibited a tensile strength of 662 MPa, a shear strength of 363 MPa, and an elongation of 14%.

[0052] like Figure 1 The image shown is a micrograph of the morphology of the titanium-aluminum-vanadium corrosion-resistant coating atomized powder. From the image, it can be seen that:

[0053] The atomized powder is spherical in shape with a relatively smooth surface and a relatively uniform overall particle size and sphericity distribution.

[0054] like Figure 2 The image shown is an end-face electron microscope image of the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel:

[0055] As can be seen from the figure, interdiffusion of elements occurs at the interface. The carbon steel forms a decarburized layer due to the diffusion of carbon elements, indicating that it is an interfacial metallurgical bond.

[0056] As can be seen from the figure, the interface is flat and smooth, without pores or oxide layers, indicating that the interface is tight and free of oxidation defects.

[0057] In addition, the interfacial shear strength of the layered composite material was measured to be 363 MPa, indicating high interfacial bonding strength.

[0058] like Figure 3 The image shown is an electron microscope (EM) image of the titanium-aluminum-vanadium (TiAvanadium) corrosion-resistant layer in a layered composite material of titanium-aluminum-vanadium (TiAvanadium) and steel.

[0059] As can be seen from the figure, due to the diffusion of carbon elements during the preparation process, carbide precipitate particles were formed in the titanium aluminum vanadium corrosion resistant layer, with an overall precipitation distance of 39.9 μm.

[0060] As can be seen from the figure, carbon exists in the titanium aluminum vanadium corrosion resistant layer with a gradient diffusion layer. Near the interface, the carbide precipitates are mainly distributed in the grain boundaries and grains. As the diffusion distance increases, the carbide precipitates in the grains gradually disappear, and the precipitates mainly accumulate at the grain boundaries.

[0061] like Figure 4 The image shown is a metallographic photograph of the titanium-aluminum-vanadium (TiAvanadium) corrosion-resistant layer. It can be seen that the TiAvanadium alloy exhibits a distinct equiaxed crystal structure.

[0062] like Figure 5 The image shown is a metallographic photograph of Q345 carbon steel. It can be seen that after heat treatment, the Q345 material mainly consists of ferrite and pearlite, with equiaxed grains.

[0063] Example 2

[0064] Referring to Example 1, the difference lies in the use of Q235, and the preparation method of the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel specifically includes the following steps:

[0065] 1) Spray granulation of Ti-6Al-4V particles:

[0066] Commercially available Ti-6Al-4V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-6Al-4V powder was placed in a drying oven and baked at 120°C for 1.5 hours to remove moisture. It was then sieved through a 300–800 mesh sieve to ensure good flowability. The dried and sieved Ti-6Al-4V was placed into a powder feeding container and then sealed.

[0067] 2) Cold spraying of Ti-6Al-4V lining:

[0068] The cold spraying process for the Ti-6Al-4V / Q235 titanium steel composite plate is as follows: accelerating air pressure 4.5MPa, powder feeding air pressure 4.9MPa, powder feeding rate 50g / min, gas temperature 800℃, and the thickness of the Ti-6Al-4V deposition layer is approximately 4.1mm.

[0069] When the Ti-6Al-4V deposition layer reaches a thickness of approximately 4.1 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0070] 3) Rolling and heat treatment process of Ti-6Al-4V / Q235 titanium steel composite plate:

[0071] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 5 minutes at 1000℃. The heated sample was then rolled in a rolling mill in three passes, with a reduction of 50%. After rolling, the titanium-steel composite slab was annealed at 550℃ for 3 hours. The prepared Ti-6Al-4V / Q235 titanium-steel composite slab exhibited a tensile strength of 438 MPa, a shear strength of 197 MPa, and an elongation of 22%.

[0072] Example 3

[0073] Referring to Example 1, the difference lies in the method for preparing the layered composite material of 316L austenitic stainless steel, titanium-aluminum-vanadium corrosion-resistant layer, and steel, which specifically includes the following steps:

[0074] 1) Spray granulation of Ti-6Al-4V particles:

[0075] Commercially available Ti-6Al-4V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-6Al-4V powder was placed in a drying oven and baked at 110°C for 1 hour to remove moisture. It was then sieved through a 300–800 mesh sieve to ensure good flowability. The dried and sieved Ti-6Al-4V was placed into a powder feeding container and then sealed.

[0076] 2) Cold spraying of Ti-6Al-4V lining:

[0077] The cold spraying process for the Ti-6Al-4V / 316L titanium steel composite plate is as follows: accelerating air pressure 4.5MPa, powder feeding air pressure 4.9MPa, powder feeding rate 50g / min, gas temperature 800℃, and the thickness of the Ti-6Al-4V deposition layer is approximately 4.1mm.

[0078] When the Ti-6Al-4V deposition layer reaches a thickness of approximately 4.1 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0079] 3) Rolling and heat treatment process of Ti-6Al-4V / 316L titanium steel composite plate:

[0080] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 5 minutes at 1000℃. The heated sample was then rolled twice in a rolling mill, with a reduction of 60%. After rolling, the titanium-steel composite slab was annealed at 560℃ for 4 hours. The prepared Ti-6Al-4V / 316L titanium-steel composite slab had a tensile strength of 611 MPa, a shear strength of 374 MPa, and an elongation of 13%.

[0081] Example 4

[0082] Referring to Example 1, the difference lies in the method for preparing the layered composite material of 304L austenitic stainless steel, titanium-aluminum-vanadium corrosion-resistant layer, and steel, which specifically includes the following steps:

[0083] 1) Spray granulation of Ti-6Al-4V particles:

[0084] Commercially available Ti-6Al-4V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-6Al-4V powder was placed in a drying oven and baked at 110°C for 2 hours to remove moisture. It was then sieved through a 300–800 mesh sieve to ensure good flowability. The dried and sieved Ti-6Al-4V was placed into a powder feeding container and then sealed.

[0085] 2) Cold spraying of Ti-6Al-4V lining:

[0086] The cold spraying process for the Ti-6Al-4V / 304 titanium steel composite plate is as follows: accelerating air pressure 4.5MPa, powder feeding air pressure 4.9MPa, powder feeding rate 50g / min, gas temperature 800℃, and the thickness of the Ti-6Al-4V deposition layer is approximately 4.1mm.

[0087] When the Ti-6Al-4V deposition layer reaches a thickness of approximately 4.1 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0088] 3) Rolling and heat treatment process of Ti-6Al-4V / 304 titanium steel composite plate:

[0089] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 5 minutes at 1000℃. The heated sample was then rolled in a rolling mill in three passes, with a reduction of 65%. After rolling, the titanium-steel composite plate was annealed at 575℃ for 4.5 hours. The prepared Ti-6Al-4V / 316L titanium-steel composite plate had a tensile strength of 524 MPa, a shear strength of 323 MPa, and an elongation of 17%.

[0090] Comparative Example 1

[0091] Referring to Example 1, the difference lies in the method for preparing the Ti-3Al-10V layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel, which specifically includes the following steps:

[0092] 1) Spray granulation of Ti-3Al-10V particles:

[0093] Commercially available Ti-3Al-10V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-3Al-10V powder was placed in a drying oven and baked at 120°C for 2 hours to remove moisture. It was then sieved through a 300–800 mesh sieve to ensure good flowability. The dried and sieved Ti-3Al-10V powder was placed into a powder feeding container and then sealed.

[0094] 2) Cold spraying of Ti-3Al-10V lining:

[0095] The cold spraying process for the Ti-3Al-10V / Q345 titanium steel composite plate is as follows: accelerating air pressure 4.5MPa, powder feeding air pressure 4.9MPa, powder feeding rate 50g / min, gas temperature 800℃, and the thickness of the Ti-3Al-10V deposition layer is approximately 4.1mm.

[0096] When the Ti-3Al-10V deposition layer reaches a thickness of approximately 4.1 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0097] 3) Rolling and heat treatment process of Ti-3Al-10V / Q345 titanium steel composite plate:

[0098] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 5 minutes at 1000℃. The heated sample was then rolled in a rolling mill in three passes, with a reduction of 55%. After rolling, the titanium-steel composite slab was annealed at 560℃ for 3 hours. The prepared Ti-3Al-10V / Q345 titanium-steel composite slab exhibited a tensile strength of 598 MPa, a shear strength of 251 MPa, and an elongation of 23%. It can be seen that replacing the material with Ti-3Al-10V resulted in a decrease in the yield strength and tensile strength of the composite material due to the lower strength of Ti-3Al-10V, while increasing the elongation.

[0099] Comparative Example 2

[0100] Referring to Example 1, the difference lies in the method for preparing the Ti-3Al-10V layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel, which specifically includes the following steps:

[0101] 1) Spray granulation of Ti-3Al-10V particles:

[0102] Commercially available Ti-3Al-10V material was purchased, atomized into powder, and then granulated using a spray granulation method. PVA was used as the binder, and water as the solvent. The resulting granules had a size of 20–80 μm and a roundness of 0.6–1.0. Before spraying, the Ti-3Al-10V powder was placed in a drying oven and baked at 100°C for 4 hours to remove moisture. It was then sieved through a 300–800 mesh sieve to ensure good flowability. The dried and sieved Ti-3Al-10V powder was placed into a powder feeding container and then sealed.

[0103] 2) Cold spraying of Ti-3Al-10V lining:

[0104] The cold spraying process for the Ti-3Al-10V / Q235 titanium steel composite plate is as follows: accelerating air pressure 3.0MPa, powder feeding air pressure 3.9MPa, powder feeding rate 35g / min, gas temperature 700℃, and the thickness of the Ti-3Al-10V deposition layer is approximately 3.3mm.

[0105] When the Ti-3Al-10V deposition layer reaches a thickness of approximately 3.3 mm, the powder feeder is turned off. When the temperature in the manifold chamber drops below 50°C, the accelerator and powder feeding gas switches are turned off.

[0106] 3) Rolling and heat treatment process of Ti-3Al-10V / Q235 titanium steel composite plate:

[0107] The pre-fabricated composite slab, prepared by cold spraying, was preheated in a muffle furnace for 10 minutes at 1050℃. The heated sample was then rolled in a rolling mill in three passes, with a reduction of 70%. After rolling, the titanium-steel composite slab was annealed at 625℃ for 3 hours. The resulting Ti-3Al-10V / Q345 titanium-steel composite slab was thus prepared. It can be seen that after replacing the material with Ti-3Al-10V and changing the forming process, the yield strength and tensile strength of the composite material decreased, while the elongation increased, due to the lower strength of Ti-3Al-10V.

[0108] The above description is only a preferred embodiment of the present invention and is 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 method for preparing a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel, characterized in that, Includes the following steps: 1) Prepare titanium aluminum vanadium powder for cold spraying, wherein the titanium aluminum vanadium powder comprises the following components in weight percentage: 5.5-6.5% aluminum, 3.5-4.5% vanadium, and the balance being titanium; 2) Dry and sieve the titanium aluminum vanadium powder obtained in step 1); 3) Using titanium aluminum vanadium powder as material, a titanium aluminum vanadium corrosion-resistant layer is prepared by cold spraying onto steel to obtain a composite material; 4) The obtained composite material is preheated, rolled and annealed in sequence to obtain a layered composite material of titanium aluminum vanadium corrosion resistant layer and steel.

2. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 1, characterized in that, In step 1): the titanium aluminum vanadium raw material is granulated by spray granulation, with polyvinyl alcohol as the binder and water as the solvent, to obtain titanium aluminum vanadium powder with a particle size of 20-80 μm and a roundness of 0.6-1.

0.

3. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 2, characterized in that, In step 1): the titanium aluminum vanadium powder comprises the following components by weight percentage: 6% aluminum, 4% vanadium, and the balance being titanium.

4. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 1, characterized in that, In step 2): the titanium aluminum vanadium powder is baked in a drying oven at 100-120°C for 1.5-2 hours and then sieved through a 300-800 mesh sieve.

5. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 1, characterized in that, In step 3), the conditions for cold spraying are: acceleration air pressure 4.4-4.6 MPa, powder feeding air pressure 4.8-5.0 MPa, powder feeding rate 45-55 g / min, gas temperature 750-850℃, and the thickness of the titanium-aluminum-vanadium corrosion-resistant layer is 4-4.2 mm.

6. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 1, characterized in that, In step 4): The preheating time is 4–6 minutes, and the preheating temperature is 950–1050℃; The rolling process involves 1 to 3 passes, with a roll-off of 50 to 65%. The annealing temperature is 550–575℃, and the annealing time is 3–4.5 h.

7. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to any one of claims 1 to 6, characterized in that: The steel is either carbon steel or stainless steel.

8. The method for preparing the layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 7, characterized in that: The carbon steel is Q235 carbon steel or Q345 carbon steel; The stainless steel is 316L austenitic stainless steel or 304 austenitic stainless steel.

9. A layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel prepared by the preparation method according to any one of claims 1 to 8.

10. The application of a layered composite material of titanium aluminum vanadium corrosion-resistant layer and steel according to claim 9, characterized in that: The column body material used to prepare glacial acetic acid distillation column.

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