High-toughness high-strength titanium alloy bar and method for manufacturing the same

Abstract

The present application relates to the technical field of water-based paint, in particular to a high-toughness high-strength titanium alloy bar and a preparation method thereof.In step one, modified zinc oxide, graphene oxide and deionized water are uniformly mixed, ultrasonic treatment is carried out for 30-50 min, water-based epoxy resin, curing agent, leveling agent and defoaming agent are uniformly mixed to obtain a corrosion-resistant coating; the corrosion-resistant coating comprises the following components by weight: water-based epoxy resin 50-70 parts, modified zinc oxide 10-15 parts, graphene oxide 5-10 parts, deionized water 30-50 parts, curing agent 8-16 parts, leveling agent 0.2-0.4 parts, and defoaming agent 0.1-0.3 parts; in step two, the corrosion-resistant coating is coated on the surface of the titanium alloy bar to form a corrosion-resistant coating layer, thereby obtaining a high-toughness high-strength titanium alloy bar which has excellent corrosion resistance and hydrophobicity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water-based coatings, in particular to a high-toughness high-strength titanium alloy rod and a preparation method thereof. BACKGROUND

[0002] With the increasing demand for material performance in aerospace, automotive manufacturing, and medical devices, high-toughness high-strength titanium alloys have attracted widespread attention due to their excellent mechanical properties and good corrosion resistance. Titanium alloys not only have low density and good specific strength, but also exhibit good high-temperature performance and fatigue resistance, and are widely used in the manufacture of structural parts and key components.

[0003] However, there are some specific problems in the prior art. First, the corrosion resistance of titanium alloy is insufficient, especially in some extreme environments, which can easily lead to rapid degradation of the material. Although current surface treatment techniques can improve corrosion resistance to some extent, they often fail to achieve ideal hydrophobic effects, and water droplets tend to adhere to the material surface, further exacerbating corrosion problems. At the same time, the existing technology usually adopts physical blending method to add corrosion inhibitor (such as zinc oxide) and barrier material (such as graphene oxide) into the resin matrix, however, the corrosion inhibitor filler is easy to agglomerate, forming defect points in the coating, which becomes the starting point of corrosion. Second, titanium alloy is prone to cracking during welding and processing, affecting its overall performance and service life. In addition, the strength and toughness of existing titanium alloys often conflict with each other, making it difficult to achieve a balance between high strength and high toughness in the same material.

[0004] Therefore, in view of the deficiencies of the prior art, we propose a high-toughness high-strength titanium alloy rod and a preparation method thereof. SUMMARY

[0005] The purpose of the present application is to provide a high-toughness high-strength titanium alloy rod and a preparation method thereof to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A preparation method of a high-toughness high-strength titanium alloy rod, comprising the following steps:

[0008] Step 1: Mix modified zinc oxide, graphene oxide and deionized water uniformly, ultrasonic treatment for 30-50 min, add water-based epoxy resin, curing agent, leveling agent and defoaming agent and mix uniformly to obtain a corrosion-resistant coating;

[0009] The corrosion-resistant coating comprises the following components by weight: 50-70 parts of water-based epoxy resin, 10-15 parts of modified zinc oxide, 5-10 parts of graphene oxide, 30-50 parts of deionized water, 8-16 parts of curing agent, 0.2-0.4 parts of leveling agent, and 0.1-0.3 parts of defoaming agent.

[0010] Step two: coating the corrosion-resistant coating on the surface of the titanium alloy bar to form a corrosion-resistant coating layer, thereby obtaining a high-toughness high-strength titanium alloy bar.

[0011] Further, the preparation method of the modified zinc oxide is as follows:

[0012] Step 1: uniformly mix the ionic liquid 1-aminopropyl-3-methyl imidazole bromide and ethanol, add cardanol glycidyl ether, heat to 40-50℃, and react for 22-24h, then spin to obtain cardanol-modified ionic liquid;

[0013] Step 2: uniformly mix the cardanol-modified ionic liquid, thiol-containing polysiloxane, and photoinitiator, and then obtain the organosilicon-modified ionic liquid after ultraviolet light irradiation;

[0014] Step 3: uniformly mix deionized water, organosilicon-modified ionic liquid, and ethanol, adjust the pH to 4.5-5.5 with acetic acid, ultrasonic treatment for 20-40min, add zinc oxide and ethanol, and react at 70-80℃ for 2-4h, then filter, wash, and dry to obtain the modified zinc oxide.

[0015] Further, in step 1, the mass ratio of the ionic liquid 1-aminopropyl-3-methyl imidazole bromide, ethanol, and cardanol glycidyl ether is 1: (1-2): (1.2-1.5).

[0016] Further, in step 2, the mass ratio of the cardanol-modified ionic liquid, thiol-containing polysiloxane, and photoinitiator is 1: (0.5-1.0): (0.01-0.03).

[0017] Further, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the process conditions for ultraviolet light irradiation are as follows: irradiation wavelength 360-400nm, irradiation time 0.5-2.0h, and irradiation intensity 20-35mW / cm 2 .

[0018] Further, the preparation method of the thiol-containing polysiloxane is as follows:

[0019] Octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and aminopropylmethyldimethoxysilane were mixed evenly and heated to 100-110℃. Tetramethylammonium hydroxide was added and the reaction was carried out for 0.5-1.0 h. The reaction was continued for 3-5 h under a vacuum of -0.098 MPa. The mixture was then cooled to room temperature to obtain a mercapto-containing polysiloxane.

[0020] Further, the mass ratio of the octamethylcyclotetrasiloxane, octadecylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane and aminopropylmethyldimethoxysilane is 1:(0.2-0.4):(0.1-0.3):(0.1-0.3).

[0021] Furthermore, the amount of tetramethylammonium hydroxide used is 0.05-0.20% of the mass of octamethylcyclotetrasiloxane.

[0022] Furthermore, the mass ratio of the deionized water, the organosilicon-modified ionic liquid, and the ethanol is 1:(0.4-0.8):(4-5).

[0023] Furthermore, the amount of zinc oxide used is 10-15 times that of the organosilicon-modified ionic liquid, and the mass ratio of zinc oxide to ethanol is 1:(1-2).

[0024] Furthermore, the preparation method of the titanium alloy rod is as follows:

[0025] Step A: Take titanium alloy ingot raw material, preheat it with microwave, and then transfer it to a heating furnace for homogenization treatment to obtain pretreated titanium alloy ingot.

[0026] Step B: Forge the pretreated titanium alloy ingot into a billet, cool it to obtain a forged billet; subject the forged billet to preheating treatment, solution treatment and aging treatment in sequence, and air cool it to obtain a titanium alloy bar.

[0027] Furthermore, in step A, the microwave preheating treatment uses an industrial microwave device with a frequency of 2450MHz, a microwave preheating time of 30-60s, a pre-pressing height of 55-65mm, and a preheating power of 6×750W.

[0028] Furthermore, in step A, the homogenization process conditions are: heat treatment at 350-500℃ for 20-40 hours.

[0029] Furthermore, in step B, the forging process conditions are as follows: the forging temperature is controlled at 800-1250℃, and the deformation is controlled at 10-50%.

[0030] Furthermore, in step B, the cooling process conditions are: controlling the cooling rate at 10-30℃ / minute, and the final cooling temperature at 20-30℃.

[0031] Further, the process condition of the preheating treatment is 20-30 min at 600-650 DEG C.

[0032] Further, the process condition of the solid solution treatment is 1-2 h at 900-950 DEG C, followed by water cooling.

[0033] Further, the process condition of the aging treatment is 12-48 h at 800-980 DEG C.

[0034] Further, the thickness of the corrosion-resistant coating is 120-250 mu m.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] The cashew phenol glycidyl ether, a bio-based raw material, is used to modify the ionic liquid 1-amine propyl-3-methyl imidazole bromide salt, and a cashew phenol modified ionic liquid is prepared, reducing the use of traditional petrochemical raw materials; then, the thiol-containing polysiloxane (Si-SH) is synthesized through the reaction of octamethylcyclotetrasiloxane, octadecylmethyl dimethoxysilane, gamma-mercapto propyl methyl dimethoxysilane and aminopropyl methyl dimethoxysilane, which contains amino groups and hydrophobic alkyl long chains, effectively improving the flexibility and impact resistance of the coating; the thiol-alkene click reaction occurs between the double bond in the cashew phenol modified ionic liquid and the thiol-containing polysiloxane, obtaining a silicone modified ionic liquid, successfully combining the corrosion inhibition performance of ionic liquid and the hydrophobic performance of silicone, the long chain structure of cashew phenol enhances the compatibility of the molecule in the coating, and the imidazole structure of the ionic liquid provides effective metal surface adsorption and corrosion inhibition capacity; finally, the silicone modified ionic liquid is grafted on the surface of zinc oxide, which can greatly improve the corrosion resistance of the coating, not only improving the dispersibility of zinc oxide in the epoxy resin, but also forming a double protection mechanism through the barrier effect of graphene oxide and the passivation effect of zinc oxide, significantly improving the corrosion resistance of the coating. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] The following parts are mass parts, unless otherwise specified; need to be explained, the purchase of all raw materials involved in the application of manufacturers have no special restrictions include (in this example) titanium alloy ingot: grade TC4, the specific composition is Ti: 88.136wt%, Al: 7.219wt%, V: 4.426wt%, Si: 0.125wt%, Fe: 0.094wt%, purchased from Luoyang KePin Titanium Industry Co., Ltd.; Cardanol glycidyl ether: CAS number is 171263-25-5, epoxy value (eq / 100g) 0.20-0.28; Ionic liquid 1-aminopropyl-3-methyl imidazole bromide: CAS number is 914770-45-9; Zinc oxide: 20-30nm, purchased from Xuzhou Jet New Material Technology Co., Ltd.; Graphene oxide: model number is DN-20DY, purchased from Zhejiang Zhitian Micro New Material Co., Ltd.; Waterborne epoxy resin: grade is American Dow DER-916; Curing agent: waterborne epoxy resin curing agent CYDHD-220, Balin Petrochemical; Leveling agent: model number is Keyin KYC-615; Defoaming agent: model number is BYK-028.

[0039] Example 1: a preparation method of a high-toughness high-strength titanium alloy bar, comprising the following processes:

[0040] Step one: 10 parts of modified zinc oxide, 5 parts of graphene oxide and 30 parts of deionized water are uniformly mixed, ultrasonic treatment is carried out for 30 min, 50 parts of waterborne epoxy resin, 8 parts of curing agent, 0.2 parts of leveling agent and 0.1 parts of defoaming agent are uniformly mixed, and a corrosion-resistant coating is obtained;

[0041] Step two: take the titanium alloy ingot raw material, use an industrial microwave device with a frequency of 2450MHz for microwave preheating treatment, the microwave preheating time is 30s, the pre-pressing height is 55mm, the preheating power is 6*750W, and then transfer into a heating furnace for homogenization treatment, and the homogenization treatment is carried out at 350℃ for 40h, and a pretreated titanium alloy ingot is obtained;

[0042] The pretreated titanium alloy ingot is subjected to forging breakdown, the forging temperature is controlled to be 950℃, the deformation amount is controlled to be 10%, and cooling (controlling the cooling rate to be 10℃ / min, and the cooling end temperature is 20℃) is carried out, and a forged blank is obtained; the forged blank is sequentially subjected to preheating treatment (preheating treatment at 600℃ for 20min), solid solution treatment (holding at 900℃ for 1h, and then water cooling) and aging treatment (holding at 800℃ for 12h), and air cooling, and a titanium alloy bar is obtained;

[0043] The corrosion-resistant coating is formed on the surface of the titanium alloy bar by coating the corrosion-resistant coating on the surface of the titanium alloy bar, and a high-toughness high-strength titanium alloy bar is obtained;

[0044] The preparation method of the modified zinc oxide is as follows:

[0045] Step 1: Mix 1 part of ionic liquid 1-aminopropyl-3-methylimidazolium bromide and 1 part of ethanol evenly, add 1.2 parts of cashew phenol glycidyl ether, heat to 40℃, react for 22h, and obtain cashew phenol modified ionic liquid by rotary evaporation.

[0046] Step 2: Mix 1 part cashew phenol modified ionic liquid, 0.5 parts mercapto-containing polysiloxane, and 0.01 parts 2-hydroxy-2-methyl-1-phenyl-1-propanone evenly. After reacting with 360nm ultraviolet light for 0.5h, the light intensity is 35mW / cm. 2 Organosilicon-modified ionic liquid was obtained;

[0047] Step 3: Mix 2.5 parts deionized water, 1 part organosilicon modified ionic liquid and 10 parts ethanol evenly, adjust the pH to 4.5 with acetic acid, sonicate for 20 min, add 10 parts zinc oxide and 10 parts ethanol, react at 70℃ for 2 h, filter, wash and dry to obtain modified zinc oxide.

[0048] The preparation method of mercapto-containing polysiloxanes is as follows:

[0049] One part of octamethylcyclotetrasiloxane, 0.2 parts of octadecylmethyldimethoxysilane, 0.1 parts of γ-mercaptopropylmethyldimethoxysilane, and 0.1 parts of aminopropylmethyldimethoxysilane were mixed evenly and heated to 100°C. 0.001 parts of tetramethylammonium hydroxide were added, and the mixture was reacted for 0.5 h. The reaction was continued for 3 h under a vacuum of -0.098 MPa. The mixture was then cooled to room temperature to obtain a mercapto-containing polysiloxane.

[0050] Example 2: A method for preparing high-toughness and high-strength titanium alloy rods, comprising the following processes:

[0051] Step 1: Mix 12 parts modified zinc oxide, 8 parts graphene oxide and 40 parts deionized water evenly, sonicate for 40 minutes, add 60 parts waterborne epoxy resin, 12 parts curing agent, 0.3 parts leveling agent and 0.2 parts defoamer and mix evenly to obtain corrosion-resistant coating.

[0052] Step 2: Take titanium alloy ingot raw material, use industrial microwave equipment with a frequency of 2450MHz for microwave preheating treatment, microwave preheating time is 50s, pre-pressing height is 60mm, preheating power is 6×750W, transfer to heating furnace for homogenization treatment, and keep at 400℃ for 30h to obtain pretreated titanium alloy ingot.

[0053] The pretreated titanium alloy ingot is forged and opened, the forging temperature is controlled at 1050 DEG C, the deformation amount is controlled at 40%, and the cooling (controlling the cooling rate at 20 DEG C / min, and the cooling end temperature is 25 DEG C) is performed to obtain a forged blank; the forged blank is sequentially subjected to preheating treatment (preheating at 620 DEG C for 25 min), solid solution treatment (heating at 930 DEG C for 1.5 h, and then water cooling), and aging treatment (heating at 900 DEG C for 24 h, and then air cooling) to obtain a titanium alloy bar;

[0054] The titanium alloy bar is coated with a corrosion-resistant coating to form a corrosion-resistant coating layer, thereby obtaining a high-toughness high-strength titanium alloy bar;

[0055] The preparation method of the modified zinc oxide is as follows:

[0056] Step 1: 1 part of ionic liquid 1-aminopropyl-3-methyl imidazole bromide and 1.5 parts of ethanol are uniformly mixed, 1.3 parts of cardanol glycidyl ether are added, the temperature is raised to 45 DEG C, and the reaction is carried out for 23 h; after rotary evaporation, a cardanol-modified ionic liquid is obtained;

[0057] Step 2: 1 part of the cardanol-modified ionic liquid, 0.8 parts of the mercapto-containing polysiloxane, and 0.02 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are uniformly mixed, and after ultraviolet light irradiation at 380 nm for 1 h, the light intensity is 30 mW / cm 2 , an organosilicon-modified ionic liquid is obtained;

[0058] Step 3: 2 parts of deionized water, 1 part of the organosilicon-modified ionic liquid, and 9 parts of ethanol are uniformly mixed, the pH is adjusted to 5.0 with acetic acid, and ultrasonic treatment is carried out for 30 min; 12 parts of zinc oxide and 18 parts of ethanol are added, and the reaction is carried out at 75 DEG C for 3 h; after filtration, washing, and drying, modified zinc oxide is obtained;

[0059] The preparation method of the mercapto-containing polysiloxane is as follows:

[0060] 1 part of octamethylcyclotetrasiloxane, 0.3 parts of octadecylmethyl dimethoxysilane, 0.2 parts of gamma-mercaptopropyl methyl dimethoxysilane, and 0.2 parts of aminopropyl methyl dimethoxysilane are uniformly mixed, heated to 105 DEG C, 0.002 parts of tetramethylammonium hydroxide are added, and the reaction is carried out for 0.8 h; under a vacuum degree of -0.098 MPa, the reaction is continued for 4 h, and the temperature is cooled to room temperature to obtain a mercapto-containing polysiloxane.

[0061] Example 3: A preparation method of a high-toughness high-strength titanium alloy bar, comprising the following processes:

[0062] Step one: 15 parts of modified zinc oxide, 10 parts of graphene oxide and 50 parts of deionized water are uniformly mixed, ultrasonic treatment is carried out for 50 min, 70 parts of water-based epoxy resin, 16 parts of curing agent, 0.4 parts of leveling agent and 0.3 parts of defoaming agent are uniformly mixed, and a corrosion-resistant coating is obtained;

[0063] Step two: take the titanium alloy ingot raw material, use an industrial microwave device with a frequency of 2450 MHz for microwave preheating treatment, the microwave preheating time is 60 s, the pre-pressing height is 65 mm, the preheating power is 6*750 W, and then transfer to a heating furnace for homogenization treatment, and the homogenization treatment is carried out at 500 DEG C for 20 h, and then a pretreated titanium alloy ingot is obtained;

[0064] Step two: the pretreated titanium alloy ingot is subjected to forging breakdown, the forging temperature is controlled to be 1250 DEG C, the deformation amount is controlled to be 50%, and the cooling (controlling the cooling rate to be 30 DEG C / min, and the cooling end temperature is 30 DEG C) is carried out, and then a forged blank is obtained; the forged blank is sequentially subjected to preheating treatment (preheating treatment at 650 DEG C for 30 min), solid solution treatment (heat preservation at 950 DEG C for 2 h, and then water cooling) and aging treatment (heat preservation at 980 DEG C for 48 h), and then air cooling is carried out, and then a titanium alloy bar is obtained;

[0065] The corrosion-resistant coating is coated on the surface of the titanium alloy bar to form a corrosion-resistant coating layer, and then a high-toughness high-strength titanium alloy bar is obtained;

[0066] The preparation method of the modified zinc oxide is as follows:

[0067] Step 1: 1 part of ionic liquid 1-aminopropyl-3-methyl imidazole bromide and 2 parts of ethanol are uniformly mixed, 1.5 parts of cardanol glycidyl ether are added, the temperature is increased to 50 DEG C, and reaction is carried out for 24 h, and then cardanol modified ionic liquid is obtained through rotary evaporation;

[0068] Step 2: 1 part of cardanol modified ionic liquid, 1 part of thiol-containing polysiloxane and 0.03 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are uniformly mixed, and then ultraviolet light with a wavelength of 400 nm is used for irradiation reaction for 2 h, the light intensity is 20 mW / cm 2 , and then organic silicon modified ionic liquid is obtained;

[0069] Step 3: 1.25 parts of deionized water, 1 part of organic silicon modified ionic liquid and 6.25 parts of ethanol are uniformly mixed, the pH is adjusted to 5.5 by using acetic acid, ultrasonic treatment is carried out for 40 min, 15 parts of zinc oxide and 30 parts of ethanol are added, and reaction is carried out at 80 DEG C for 4 h, and then modified zinc oxide is obtained through filtration, washing and drying;

[0070] The preparation method of the thiol-containing polysiloxane is as follows:

[0071] Mixing 1 part of octamethylcyclotetrasiloxane, 0.4 part of octadecylmethyldimethoxysilane, 0.3 part of γ-mercaptopropylmethyldimethoxysilane and 0.3 part of aminopropylmethyldimethoxysilane uniformly, heating to 110℃, adding 0.001 part of tetramethylammonium hydroxide, reacting for 1.0 h, continuing to react for 5 h under a vacuum degree of -0.098 MPa, and cooling to room temperature to obtain a mercapto-containing polysiloxane.

[0072] Comparative Example 1: Comparative Example 1 is based on Example 2, and in Comparative Example 1, the mercapto-containing polysiloxane is replaced by the same mass of γ-mercaptopropylmethyldimethoxysilane; the remaining process steps and reaction parameters are consistent with those of Example 2.

[0073] The preparation method of the modified zinc oxide is as follows:

[0074] Step 1: uniformly mixing 1 part of ionic liquid 1-aminopropyl-3-methylimidazolium bromide and 1.5 parts of ethanol, adding 1.3 parts of cardanol glycidyl ether, and heating to 45℃ for 23 h of reaction, and then obtaining cardanol-modified ionic liquid by rotary evaporation.

[0075] Step 2: uniformly mixing 1 part of cardanol-modified ionic liquid, 0.8 part of γ-mercaptopropylmethyldimethoxysilane and 0.02 part of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and then obtaining silicone-modified ionic liquid by ultraviolet irradiation at 380 nm for 1 h after the light intensity is 30 mW / cm 2 .

[0076] Step 3: uniformly mixing 2 parts of deionized water, 1 part of silicone-modified ionic liquid and 9 parts of ethanol, adjusting the pH to 5.0 with acetic acid, ultrasonic treatment for 30 min, adding 12 parts of zinc oxide and 18 parts of ethanol, and reacting at 75℃ for 3 h, and then obtaining modified zinc oxide by filtration, washing and drying.

[0077] Comparative Example 2: Comparative Example 2 is based on Example 2, and in Comparative Example 2, the cardanol-modified ionic liquid is replaced by the same mass of cardanol glycidyl ether without introducing ionic liquid; the remaining process steps and reaction parameters are consistent with those of Example 2.

[0078] The preparation method of the modified zinc oxide is as follows:

[0079] Step 1: uniformly mixing 1 part of cardanol glycidyl ether, 0.8 part of mercapto-containing polysiloxane and 0.02 part of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and then obtaining an intermediate by ultraviolet irradiation at 380 nm for 1 h after the light intensity is 30 mW / cm 2 .

[0080] Step 2: 2 parts of deionized water, 1 part of the intermediate, and 9 parts of ethanol were uniformly mixed, the pH was adjusted to 5.0 with acetic acid, and ultrasonic treatment was performed for 30 min. 12 parts of zinc oxide and 18 parts of ethanol were added, and the reaction was performed at 75℃ for 3h. After being filtered, washed, and dried, the modified zinc oxide was obtained.

[0081] Comparative Example 3: Comparative Example 3 was based on Example 2, and in Comparative Example 3, the modified zinc oxide was replaced with zinc oxide of the same mass; the remaining process steps and reaction parameters were consistent with Example 2.

[0082] Comparative Example 4: Comparative Example 4 was based on Example 2, and in Comparative Example 4, the titanium alloy ingot was not pretreated and solution treated; the remaining process steps and reaction parameters were consistent with Example 2.

[0083] A method for preparing a high-toughness high-strength titanium alloy rod, comprising the following processes:

[0084] Step 1: 12 parts of modified zinc oxide, 8 parts of graphene oxide, and 40 parts of deionized water were uniformly mixed and ultrasonically treated for 40 min. 60 parts of water-based epoxy resin, 12 parts of curing agent, 0.3 parts of leveling agent, and 0.2 parts of defoaming agent were uniformly mixed to obtain a corrosion-resistant coating.

[0085] Step 2: The titanium alloy ingot was forged and broken down, with the forging temperature controlled at 1050℃ and the deformation amount controlled at 40%. The forged blank was cooled at a cooling rate of 20℃ / min and the cooling endpoint temperature was 25℃. The forged blank was then sequentially subjected to preheating treatment (preheated at 620℃ for 25 min) and aging treatment (aged at 900℃ for 24h) and air-cooled to obtain a titanium alloy rod.

[0086] The corrosion-resistant coating was coated on the surface of the titanium alloy rod to form a corrosion-resistant coating layer, thereby obtaining a high-toughness high-strength titanium alloy rod.

[0087] Experiment: The high-toughness high-strength titanium alloy rods obtained in Examples 1-3 and Comparative Examples 1-4 were taken to prepare samples, and the performance of each sample was detected and the detection results were recorded.

[0088] Tensile strength test: according to GB / T 228.1-2021 “Metallic materials-Tensile testing-Part 1: Method of test at room temperature”, the tensile strength was measured by using an electronic universal testing machine, the overall length of the sample was 42 mm, the width was 18 mm, the gauge length was 10 mm, the thickness was 2.5 mm, and the tensile speed was 1 mm / min; hydrophobicity test: the surface of the sample was tested by a water contact angle tester, the experimental steps were as follows: 5 μL of deionized water was vertically dropped on the surface by using a 5 μL needle tube under room temperature, the static contact angle was measured at different positions on the surface for 3 times, and the average value was taken; corrosion resistance test: the size of the sample was 50 mm x 50 mm, the original mass of the sample before corrosion was measured, the sample was placed in a 0.01 mol / L sodium bisulfite solution, the pH value of the solution was 4, the temperature was 45 ℃, the humidity was 70% RH, the test period was 72 h, after the test, the sample was taken out and dried, then the mass of the sample after corrosion was measured, and the corrosion weight loss rate was calculated = (original mass of the sample before corrosion - mass of the sample after corrosion) / (corrosion area x test time).

[0089] The test results are shown in Table 1.

[0090] Table 1 Performance test results of high-toughness high-strength titanium alloy bar

[0091]

[0092] According to the data in the above table, the following conclusions can be clearly obtained:

[0093] Compared with Examples 1-3, the water contact angle of the product obtained in Comparative Example 1 decreases, and the corrosion weight loss rate increases, indicating that the thiol-containing polysiloxane prepared by the present application has better hydrophobic effect and compatibility than γ-mercaptopropyl methyl dimethoxy silane, thereby effectively improving the hydrophobicity and corrosion resistance of the material; the corrosion weight loss rate of the product obtained in Comparative Example 2 increases, which indicates that the imidazole structure of the modified ionic liquid 1-aminopropyl-3-methyl imidazole bromide provides effective metal surface adsorption and corrosion inhibition capacity, thereby improving the corrosion resistance of the material; the hydrophobicity and corrosion resistance of the product obtained in Comparative Example 3 decrease, indicating that the modification treatment of zinc oxide by the present application effectively improves the corrosion resistance and hydrophobicity of the coating, thereby prolonging the service life of the material; the tensile strength of the product obtained in Comparative Example 4 decreases, which indicates that the pretreatment and solid solution treatment of the titanium alloy ingot by the present application further improves the mechanical properties of the material.

[0094] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A method of producing a high-ductility, high-strength titanium alloy bar, characterized by: It comprises the following steps: Step 1: mix the modified zinc oxide, graphene oxide and deionized water uniformly, and ultrasonic treatment for 30-50 min; then add the water-based epoxy resin, curing agent, leveling agent and defoaming agent and mix them uniformly to obtain the corrosion-resistant coating; The corrosion-resistant coating comprises the following components by weight: water-based epoxy resin 50-70 parts, modified zinc oxide 10-15 parts, graphene oxide 5-10 parts, deionized water 30-50 parts, curing agent 8-16 parts, leveling agent 0.2-0.4 parts, and defoaming agent 0.1-0.3 parts; Step 2: coat the corrosion-resistant coating on the surface of the titanium alloy bar to form a corrosion-resistant coating layer, thereby obtaining a high-toughness high-strength titanium alloy bar; The preparation method of the modified zinc oxide is as follows: Step 1: mix the ionic liquid 1-aminopropyl-3-methyl imidazole bromide and ethanol uniformly, add cardanol glycidyl ether, heat to 40-50℃, and react for 22-24 h; then spin to obtain cardanol-modified ionic liquid; Step 2: mix the cardanol-modified ionic liquid, thiol-containing polysiloxane and photoinitiator uniformly, and then irradiate under ultraviolet light to obtain silicone-modified ionic liquid; Step 3: mix deionized water, silicone-modified ionic liquid and ethanol uniformly, adjust the pH to 4.5-5.5 with acetic acid, ultrasonic treatment for 20-40 min, add zinc oxide and ethanol, and react at 70-80℃ for 2-4 h; then filter, wash and dry to obtain the modified zinc oxide.

2. The method of claim 1, wherein the high-ductility, high-strength titanium alloy bar is produced by the following steps: In Step 2, the mass ratio of the cardanol-modified ionic liquid, thiol-containing polysiloxane and photoinitiator is 1:(0.5-1.0):(0.01-0.03). ​ 3. The method of claim 2, wherein the method further comprises: The preparation method of the thiol-containing polysiloxane is as follows: ​ Mix octamethylcyclotetrasiloxane, octadecylmethyl dimethoxysilane, γ-mercaptopropyl methyl dimethoxysilane and aminopropyl methyl dimethoxysilane uniformly, heat to 100-110℃, add tetramethylammonium hydroxide, react for 0.5-1.0 h, continue to react for 3-5 h under a vacuum degree of -0.098 MPa, and cool to room temperature to obtain the thiol-containing polysiloxane.

4. The method of claim 1, wherein the method further comprises: The preparation method of the titanium alloy bar is as follows: ​ Step A: take the titanium alloy ingot raw material, perform microwave preheating treatment, and then transfer it into a heating furnace for homogenization treatment to obtain a pretreated titanium alloy ingot; Step B: perform forging breakdown on the pretreated titanium alloy ingot, cool it to obtain a forged blank; and then perform preheating treatment, solid solution treatment and aging treatment on the forged blank in sequence, and air cool it to obtain the titanium alloy bar.

5. The method of claim 4, wherein the method further comprises: In Step B, the process conditions for the forging breakdown are as follows: control the forging temperature at 950-1250℃, and control the deformation amount at 10-50%. ​ 6. The method of claim 4, wherein the method further comprises: The process conditions for the solid solution treatment are as follows: heat preservation at 900-950℃ for 1-2 h, and then water cooling. ​ 7. The method of claim 4, wherein the method further comprises: The process conditions for the aging treatment are as follows: heat preservation at 800-980℃ for 12-48 h. ​ 8. The method of claim 1, wherein the method further comprises: The thickness of the corrosion-resistant coating layer is 120-250 μm. ​ 9. A high-toughness high-strength titanium alloy bar prepared by the preparation method according to any one of claims 1-8.

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