High-strength titanium alloy luggage rack and preparation process thereof

Abstract

The application relates to the technical field of titanium alloy, in particular to a high-strength titanium alloy luggage rack and a preparation process thereof. When the titanium alloy surface is micro-arc oxidized, composite nano-aluminum oxide is introduced, and then a sealing coating with self-repairing property is coated; the nano-aluminum oxide is modified, an aluminum-based framework MOFs with 5, 10, 15, 20-(4-carboxyl phenyl) porphyrin as a ligand is constructed on the surface of the nano-aluminum oxide by using a hydrothermal method, ZIF-8 with 2-methyl imidazole as a ligand is grown on the surface of the aluminum-based framework MOFs, and a double-Schiff base corrosion inhibitor containing a mercapto group is loaded into the composite MOFs by using a negative pressure method; trimethylolpropane triglycidyl ether is used as an epoxy monomer, a double-Schiff base corrosion inhibitor containing a mercapto group with a dynamic imine bond and 3,3-dithiodipropionic acid with a dynamic disulfide bond are used as cross-linking agents to synthesize a self-repairing prepolymer.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of titanium alloys, in particular to a high-strength titanium alloy luggage rack and a preparation process thereof. BACKGROUND

[0002] The luggage rack refers to a support for conveniently carrying luggage, and the luggage rack for vehicles is usually installed on the roof or inside the vehicle body. Most of the current luggage racks for vehicles are made of stainless steel, which is not prone to rust, but has a large mass, which is not conducive to the lightweight development of vehicles.

[0003] Titanium alloys have the advantages of high thermal stability and light weight, and are widely used in aerospace, biomedicine and transportation. The use of titanium alloys to prepare automobile luggage racks is conducive to the lightweight development of vehicles. However, titanium alloys also have the problems of low surface hardness, poor wear resistance and easy corrosion in oxygen-deficient or high-temperature acidic environments. SUMMARY

[0004] The application aims to provide a high-strength titanium alloy luggage rack and a preparation process thereof to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the application provides the following technical scheme.

[0006] A preparation process of a high-strength titanium alloy luggage rack comprises the following steps:

[0007] S1: taking a TC4 titanium alloy bar as a luggage rack base material, performing draw bending forming, sawing, milling, drilling, deburring, polishing, cleaning, and blow-drying to obtain the base material;

[0008] S2: sequentially performing alkali washing and sanding on the base material, and then placing the base material in a composite electrolyte to perform micro-arc oxidation to obtain a pretreated base material;

[0009] S3: preparing a sealing coating by using a composite nano-alumina, a self-repairing prepolymer and a curing agent;

[0010] S4: coating the sealing coating on the pretreated base material and curing to obtain a high-strength titanium alloy luggage rack.

[0011] Further, the alkali washing solution is one or a combination of sodium hydroxide, potassium hydroxide and sodium bicarbonate.

[0012] Further, the working conditions of the micro-arc oxidation are as follows: the oxidation voltage is 600 V, the pulse frequency is 600 Hz, the pulse duty cycle is 18%, and the oxidation time is 15 min.

[0013] Further, deionized water is used as the solvent, and the composition of the composite electrolyte is as follows: 7.8 g / L of sodium silicate, 3.2 g / L of sodium hexametaphosphate, 0.9 g / L of sodium hydroxide, 6 mL / L of glycerol and 5 g / L of composite nano-alumina.

[0014] Further, the sealing coating is composed of 1-4 parts of the composite nano-alumina, 18-21 parts of the self-repairing prepolymer and 1-3 parts of the curing agent.

[0015] Further, the curing agent is an amine curing agent.

[0016] Further, the preparation of the composite nano-alumina comprises the following steps:

[0017] (1) mixing pyrrole, 4-(methylsulfonyl)benzoic acid and propionic acid, keeping at 133-135 DEG C for 2 hours, cooling, adding methanol, stirring in an ice bath for 20-30 minutes, filtering, washing and drying to obtain 5,10,15,20-(4-carboxyphenyl)porphyrin;

[0018] (2) mixing 5,10,15,20-(4-carboxyphenyl)porphyrin, aluminum chloride hexahydrate and deionized water, heating and stirring for 25-30 minutes, transferring into a reaction kettle, keeping at 178-182 DEG C for 2-4 hours, adding nano-alumina, continuing to keep for 8-10 hours, cooling, centrifuging, washing and drying to obtain modified nano-alumina;

[0019] (3) mixing the modified nano-alumina, 2-methylimidazole and methanol, adding a mixed solution of zinc nitrate hexahydrate and methanol, continuing to stir for 10-12 hours, drying, adding a mixed solution of the thiol-containing double-schiff base corrosion inhibitor and acetone, transferring into a vacuum drying box and placing for 25-30 minutes, reducing the air pressure of the vacuum box to 0.04-0.07 MPa, centrifuging, continuing to disperse into the mixed solution of the thiol-containing double-schiff base corrosion inhibitor and acetone, repeating the dispersion operation for 3-5 times, rotary evaporation and drying to obtain the composite nano-alumina.

[0020] Further, the preparation of the self-repairing prepolymer comprises the following steps: mixing trimethylolpropane triglycidyl ether, the thiol-containing double-schiff base corrosion inhibitor and 3,3-dithiodipropionic acid, adding a mixed solution of 4-dimethylaminopyridine, imidazole and tetrahydrofuran, ultrasonic stirring for 1-2 hours, then keeping at 18-25 DEG C for 1-2 hours, discharging to obtain the self-repairing prepolymer.

[0021] Further, the preparation of the thiol-containing double-schiff base corrosion inhibitor comprises the following steps:

[0022] mixing glutathione, sodium hydroxide and anhydrous ethanol, heating to 30-35 DEG C, adding a mixed solution of ethanol and terephthalic acid, cooling, suction filtering, washing with anhydrous ethanol for 3-5 times, grinding to obtain the thiol-containing double-schiff base corrosion inhibitor.

[0023] The beneficial effects of the present application are as follows:

[0024] The application provides a high-strength titanium alloy luggage rack and a preparation process thereof, which introduces composite nano-aluminum oxide during micro-arc oxidation on the surface of the titanium alloy, and then coats a self-repairing sealing coating, so that a mechanically damage-resistant corrosion-resistant and antibacterial surface is constructed on the surface of the luggage rack, and the service life of the luggage rack is greatly prolonged.

[0025] Micro-arc oxidation is used to improve the strength and wear resistance of the titanium alloy, and after nano-aluminum oxide is added in the composite electrolyte, the surface quality, thickness, microhardness and wear resistance of the micro-arc oxidation film layer are improved, in order to uniformly distribute the nano-aluminum oxide on the surface of the titanium alloy, the nano-aluminum oxide is modified, an aluminum-based framework MOFs with 5, 10, 15, 20-(4-carboxylphenyl) porphyrin as a ligand is constructed on the surface of the nano-aluminum oxide by using a hydrothermal method, so as to improve the moving rate of the nano-aluminum oxide in the composite electrolyte, in order to further improve the corrosion resistance, a MOFs-On-MOFs strategy is used to grow ZIF-8 with 2-methyl imidazole as a ligand on the surface of the aluminum-based framework MOFs, the synthesized composite MOFs are used as containers of the corrosion inhibitor, and a dithiophoric Schiff base corrosion inhibitor is loaded into the composite MOFs by using a negative pressure method, so that the mechanical properties, corrosion resistance and antibacterial property of the luggage rack are greatly improved, wherein the dithiophoric Schiff base corrosion inhibitor is prepared by using glutathione and terephthaldehyde as raw materials, and condensation to form the corrosion inhibitor with a large number of adsorption groups, a long molecular chain, a sulfhydryl group, a carboxyl group and an imine bond, and the corrosion inhibitor has high corrosion inhibition efficiency.

[0026] In order to endow the luggage rack with excellent mechanical damage resistance, so that the luggage rack can be quickly recovered under the action of light after mechanical scratching and excellent self-healing is maintained, the sealing coating is designed to have excellent self-repairing property and antibacterial property.

[0027] The existing self-repairing coating in the market is mostly regulated by a single dynamic covalent bond, and the self-repairing has certain limitations, the application uses trimethylolpropane triglycidyl ether as an epoxy monomer, uses a dithiophoric Schiff base corrosion inhibitor containing a dynamic imine bond as a rigid crosslinking agent and 3,3-dithiodipropionic acid containing a dynamic disulfide bond as a flexible crosslinking agent, obtains a self-repairing prepolymer with a network structure combined by multiple dynamic covalent bonds and hydrogen bonds through click reaction of epoxy-sulfhydryl and esterification addition of epoxy-carboxyl by adjusting the proportion, then uses composite nano-aluminum oxide as a toughening agent, introduces metal bond complexation, constructs a complex self-repairing network system, accelerates the self-repairing rate under light, constructs an antibacterial surface with mechanical durability, weather resistance and corrosion resistance on the surface of the titanium alloy, and thus the service life of the titanium alloy is prolonged. DETAILED DESCRIPTION

[0028] The technical solutions in the present application will be described clearly and completely below in connection with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] It should be noted that if the embodiments of the present application involve directional indications such as up, down, left, right, front, back, the directional indications are only used to explain the relative position relationship, movement condition and the like between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0030] The technical solutions of the present application will be described in further detail below in connection with specific embodiments. It should be understood that the following embodiments are only used to explain the present application, and are not used to limit the present application.

[0031] Embodiment 1: A preparation process of a high-strength titanium alloy luggage rack, comprising the following steps:

[0032] S1: Taking TC4 titanium alloy bars as the base material of the luggage rack, performing draw bending forming, sawing, milling, drilling, deburring, polishing, cleaning, and blow-drying to obtain the base material;

[0033] S2: After the base material is sequentially subjected to alkali washing and sanding, the base material is placed into a composite electrolyte for micro-arc oxidation to obtain a pretreated base material;

[0034] The solution used for alkali washing is a sodium hydroxide solution with a mass concentration of 12%, and the cleaning time is 5 min;

[0035] The working conditions for micro-arc oxidation are as follows: the oxidation voltage is 600 V, the pulse frequency is 600 Hz, the pulse duty cycle is 18%, and the oxidation time is 15 min;

[0036] The composite electrolyte is composed of 7.8 g / L of sodium silicate, 3.2 g / L of sodium hexametaphosphate, 0.9 g / L of sodium hydroxide, 6 mL / L of glycerol, and 5 g / L of composite nano-aluminum oxide, with deionized water as the solvent;

[0037] The preparation of the composite nano-aluminum oxide comprises the following steps:

[0038] (1) First, 2.9 mL of pyrrole, 6.08 g of 4-(methylsulfonyl)benzoic acid, 150 mL of propionic acid were mixed, and incubated at 133°C for 2 h, cooled, 200 mL of methanol was added, stirred in ice bath for 20 min, filtered, washed, and dried to obtain 5,10,15,20-(4-carboxyphenyl)porphyrin;

[0039] (2) 1 g of 5,10,15,20-(4-carboxyphenyl)porphyrin, 0.6 g of aluminum chloride hexahydrate, 100 mL of deionized water were mixed, stirred for 25 min, transferred to a reaction kettle, incubated at 178°C for 4 h, 0.2 g of a mixture of nano-alumina and 10 mL of deionized water was added, and incubated for another 8 h, cooled, centrifuged, washed, and dried to obtain modified nano-alumina;

[0040] (3) 1 g of modified nano-alumina, 9 g of 2-methylimidazole, 25 mL of methanol were mixed, 1.25 g of a mixture of zinc nitrate hexahydrate and 20 mL of methanol was added, and stirred for another 10 h, dried, 700 mg of a mixture of thiol-containing bis-Schiff base corrosion inhibitor and 15 mL of acetone was added, transferred to a vacuum drying oven and placed for 25 min, the air pressure in the vacuum oven was reduced to 0.04 MPa, centrifuged, and dispersed into 700 mg of a mixture of thiol-containing bis-Schiff base corrosion inhibitor and 15 mL of acetone, and the dispersion operation was repeated for 3 times, rotary evaporated, and dried to obtain composite nano-alumina;

[0041] S3: The composite nano-alumina, the self-repairing prepolymer, and the curing agent were used to prepare a hole sealing coating;

[0042] The hole sealing coating comprises, by weight, 1 part of composite nano-alumina, 18 parts of self-repairing prepolymer, and 1 part of amine curing agent;

[0043] The preparation of the self-repairing prepolymer comprises the following steps: 2.4 g of trimethylolpropane triglycidyl ether, 3.3 g of thiol-containing bis-Schiff base corrosion inhibitor, and 1.47 g of 3,3-dithiodipropionic acid were mixed, 71.7 mg of 4-dimethylaminopyridine, 71.7 mg of imidazole, and 20 mL of tetrahydrofuran were added, ultrasonic stirring was performed for 1 h, and then incubation was performed at 18°C for 2 h, and the product was discharged to obtain the self-repairing prepolymer;

[0044] The preparation of the thiol-containing bis-Schiff base corrosion inhibitor comprises the following steps:

[0045] 4 mmol of glutathione, 8 mmol of sodium hydroxide, and 10 mL of anhydrous ethanol were mixed, the temperature was raised to 30°C, a mixture of 20 mL of ethanol and 2 mmol of terephthalic acid was added, cooled, suction filtered, washed with anhydrous ethanol for 3 times, and ground to obtain the thiol-containing bis-Schiff base corrosion inhibitor;

[0046] S4: applying a sealing coating to the pretreated substrate, and curing to obtain a high-strength titanium alloy luggage rack.

[0047] Embodiment 2: a preparation process of a high-strength titanium alloy luggage rack, comprising the following steps:

[0048] S1: taking a TC4 titanium alloy bar as a luggage rack substrate, performing draw bending forming, sawing, milling, drilling, deburring, polishing, cleaning, and blow-drying to obtain a substrate;

[0049] S2: sequentially performing alkali washing and sanding on the substrate, and then placing the substrate into a composite electrolyte to perform micro-arc oxidation to obtain a pretreated substrate;

[0050] The alkali washing solution is a sodium hydroxide solution with a mass concentration of 12%, and the cleaning time is 5 min;

[0051] The working conditions of the micro-arc oxidation are as follows: an oxidation voltage of 600 V, a pulse frequency of 600 Hz, a pulse duty cycle of 18%, and an oxidation time of 15 min;

[0052] The composite electrolyte is prepared by using deionized water as a solvent and 7.8 g / L of sodium silicate, 3.2 g / L of sodium hexametaphosphate, 0.9 g / L of sodium hydroxide, 6 mL / L of glycerol, and 5 g / L of composite nano-aluminum oxide;

[0053] The preparation of the composite nano-aluminum oxide comprises the following steps:

[0054] (1) first, 2.9 mL of pyrrole, 6.08 g of 4-(methylsulfonyl) benzoic acid, and 150 mL of propionic acid are mixed, and then the mixture is kept at 134 ℃ for 2 h, cooled, 200 mL of methanol is added, and the mixture is stirred in an ice bath for 25 min, filtered, washed, and dried to obtain 5,10,15,20-(4-carboxyphenyl) porphyrin;

[0055] (2) 1 g of 5,10,15,20-(4-carboxyphenyl) porphyrin, 0.6 g of aluminum chloride hexahydrate, and 100 mL of deionized water are mixed, heated and stirred for 28 min, transferred into a reaction kettle, kept at 180 ℃ for 3 h, 0.2 g of a mixture of nano-aluminum oxide and 10 mL of deionized water is added, and then the mixture is kept at 180 ℃ for another 9 h, cooled, centrifuged, washed, and dried to obtain modified nano-aluminum oxide;

[0056] (3) 1 g modified nano-alumina, 9 g 2-methylimidazole, 25 mL methanol were mixed, and a mixed solution of 1.25 g zinc nitrate hexahydrate and 20 mL methanol was added, and stirring was continued for 11 h, and then drying was performed, and a mixed solution of 700 mg thiol-containing bis-Schiff base corrosion inhibitor and 15 mL acetone was added, and then the mixture was transferred into a vacuum drying box and placed for 28 min, and the air pressure in the vacuum box was reduced to 0.06 MPa, and then centrifugation was performed, and then the dispersion operation was repeated 4 times by dispersing into a mixed solution of 700 mg thiol-containing bis-Schiff base corrosion inhibitor and 15 mL acetone, and then rotary evaporation and drying were performed, to obtain the composite nano-alumina;

[0057] S3: The sealing coating was prepared from the composite nano-alumina, the self-repairing prepolymer, and the curing agent;

[0058] The sealing coating was prepared from the composite nano-alumina, the self-repairing prepolymer, and the curing agent;

[0059] The self-repairing prepolymer was prepared by the following steps: 2.4 g trimethylolpropane triglycidyl ether, 3.3 g thiol-containing bis-Schiff base corrosion inhibitor, and 1.47 g 3,3-dithiodipropionic acid were mixed, and a mixed solution of 71.7 mg 4-dimethylaminopyridine, 71.7 mg imidazole, and 20 mL tetrahydrofuran was added, and then ultrasonic stirring was performed for 1.5 h, and then the mixture was kept at 20℃ for 1.5 h, and then the product was discharged, to obtain the self-repairing prepolymer;

[0060] The thiol-containing bis-Schiff base corrosion inhibitor was prepared by the following steps:

[0061] 4 mmol glutathione, 8 mmol sodium hydroxide, and 10 mL anhydrous ethanol were mixed, and the mixture was warmed to 33℃, and then a mixed solution of 20 mL ethanol and 2 mmol terephthalic acid was added, and then the mixture was cooled, and then suction filtration was performed, and then the product was washed with anhydrous ethanol 4 times, and then the product was ground, to obtain the thiol-containing bis-Schiff base corrosion inhibitor;

[0062] S4: The sealing coating was coated on the pretreated substrate, and then curing was performed, to obtain a high-strength titanium alloy luggage rack.

[0063] Embodiment 3: A preparation process of a high-strength titanium alloy luggage rack, comprising the following steps:

[0064] S1: A TC4 titanium alloy bar was taken as the luggage rack substrate, and then the substrate was subjected to stretch bending forming, sawing, milling, drilling, deburring, polishing, cleaning, and blow drying, to obtain the substrate;

[0065] S2: The substrate was sequentially subjected to alkaline cleaning and sanding, and then was placed in a composite electrolyte for micro-arc oxidation, to obtain a pretreated substrate;

[0066] The alkaline cleaning solution was a sodium hydroxide solution with a mass concentration of 12%, and the cleaning time was 5 min;

[0067] The working conditions of micro-arc oxidation are as follows: oxidation voltage is 600 V, pulse frequency is 600 Hz, pulse duty cycle is 18%, and oxidation time is 15 min.

[0068] The composite electrolyte is prepared by using deionized water as a solvent and 7.8 g / L of sodium silicate, 3.2 g / L of sodium hexametaphosphate, 0.9 g / L of sodium hydroxide, 6 mL / L of glycerol and 5 g / L of composite nano-aluminum oxide.

[0069] The preparation of the composite nano-aluminum oxide comprises the following steps:

[0070] (1) First, 2.9 mL of pyrrole, 6.08 g of 4-(methylsulfonyl) benzoic acid and 150 mL of propionic acid are mixed, and then the mixture is kept at 135 ℃ for 2 h, cooled, 200 mL of methanol is added, and the mixture is stirred in an ice bath for 25 min, filtered, washed and dried to obtain 5,10,15,20-(4-carboxyphenyl) porphyrin;

[0071] (2) 1 g of 5,10,15,20-(4-carboxyphenyl) porphyrin, 0.6 g of aluminum chloride hexahydrate and 100 mL of deionized water are mixed, heated and stirred for 30 min, transferred into a reaction kettle, kept at 182 ℃ for 2 h, 0.2 g of a mixture of nano-aluminum oxide and 10 mL of deionized water is added, and the mixture is kept at 182 ℃ for another 10 h, cooled, centrifuged, washed and dried to obtain modified nano-aluminum oxide;

[0072] (3) 1 g of the modified nano-aluminum oxide, 9 g of 2-methylimidazole and 25 mL of methanol are mixed, 1.25 g of a mixture of zinc nitrate hexahydrate and 20 mL of methanol is added, the mixture is continuously stirred for 12 h, dried, 700 mg of a mixture of a thiol-containing bis-Schiff base corrosion inhibitor and 15 mL of acetone is added, the mixture is transferred into a vacuum drying box and kept for 30 min, the air pressure in the vacuum box is reduced to 0.07 MPa, centrifuged, and the mixture is dispersed into 700 mg of a mixture of a thiol-containing bis-Schiff base corrosion inhibitor and 15 mL of acetone, and the dispersion operation is repeated for 5 times, rotary evaporated, and dried to obtain the composite nano-aluminum oxide;

[0073] S3: The sealing coating is prepared by using the composite nano-aluminum oxide, the self-repairing prepolymer and the curing agent;

[0074] The sealing coating comprises, by weight, 4 parts of the composite nano-aluminum oxide, 21 parts of the self-repairing prepolymer and 3 parts of the curing agent.

[0075] The preparation of the self-repairing prepolymer comprises the following steps: 2.4 g of trimethylolpropane triglycidyl ether, 3.3 g of a thiol-containing bis-Schiff base corrosion inhibitor and 1.47 g of 3,3-dithiodipropionic acid are mixed, 71.7 mg of a mixture of 4-dimethylaminopyridine, 71.7 mg of imidazole and 20 mL of tetrahydrofuran is added, the mixture is ultrasonically stirred for 2 h, and then kept at 25 ℃ for 1 h, and the mixture is discharged to obtain the self-repairing prepolymer.

[0076] The preparation of the thiol-containing bis-Schiff base corrosion inhibitor comprises the following steps:

[0077] 4 mmol glutathione, 8 mmol sodium hydroxide, 10 mL anhydrous ethanol are mixed, warmed to 35℃, and a mixture of 20 mL ethanol and 2 mmol terephthalic acid is added. After cooling and suction filtration, the product is washed with anhydrous ethanol 5 times, ground, and the thiol-containing bis-Schiff base corrosion inhibitor is obtained.

[0078] S4: The hole sealing paint is applied to the pretreated substrate and cured to obtain a high-strength titanium alloy luggage rack.

[0079] Comparative Example 1: Example 3 is used as a control group, and the composite nano-alumina is replaced with nano-alumina, and the other procedures are normal.

[0080] Comparative Example 2: Example 3 is used as a control group, and the thiol-containing bis-Schiff base corrosion inhibitor is not prepared, and the other procedures are normal.

[0081] Comparative Example 3: Example 3 is used as a control group, and 3,3-dithiodipropionic acid is not added, and the other procedures are normal.

[0082] The coating thickness of the hole sealing paint in the examples and comparative examples is 10 μm.

[0083] The sources of the raw materials used are as follows:

[0084] TC4 titanium alloy bar (2 cm in diameter): 5.92% aluminum, 3.91% vanadium, 0.15% iron, 0.007% nitrogen, 0.16% oxygen, and the balance being titanium; sodium silicate S302432, sodium hexametaphosphate S108858, glycerol G116203, pyrrole P104878, 4-(methylsulfonyl) benzoic acid M158289, aluminum chloride hexahydrate A112509, nano-alumina A299286, 2-methylimidazole M104839, zinc nitrate hexahydrate Z111703, amine curing agent is tetramethylethylenediamine T105497, 3,3-dithiodipropionic acid D106546, 4-dimethylamino pyridine D109207, imidazole I108707, tetrahydrofuran T431413, glutathione G163760, terephthalic acid P108506: aladdin reagent; sodium hydroxide, propionic acid, methanol, acetone, anhydrous ethanol, analytical pure: national pharmaceutical group reagent.

[0085] Performance test: the luggage racks prepared in the examples and comparative examples are tested:

[0086] Vickers hardness: tested by microhardness tester, pressurization time is 15s, constant load is 200g; antibacterial property: Escherichia coli is used as test bacteria, and the antibacterial rate is tested by inhibition zone; self-repairing property: a 100um long, 5um wide and 8um deep scratch is drawn on the surface, the scratch length is observed under a 500W xenon lamp for 6h, and the self-repairing rate is characterized; salt spray resistance: reference is made to GB / T1771-2007, working temperature is 33℃, working pH is 6.9, and sodium chloride concentration is 58g / L; the obtained results are shown in Table 1 below;

[0087] Table 1

[0088] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Vickers hardness (HV) 953 955 956 894 952 953 Antibacterial property (%) 99.98 99.99 99.99 89.72 92.31 97.85 Self-repairing rate (%) 99.9 100 100 95.1 91.3 92.4 Salt spray resistance (75 d) No rusting No rusting No rusting Rusting occurred Rusting occurred Rusting occurred

[0089] The application provides a high-strength titanium alloy luggage rack and a preparation process thereof, which introduces composite nano-aluminum oxide during micro-arc oxidation on the surface of the titanium alloy, then coats a self-repairing sealing coating, constructs a mechanical damage-resistant wear-resistant and antibacterial surface on the surface of the luggage rack, and greatly prolongs the service life of the luggage rack.

[0090] Comparing Example 3 with Comparative Example 1, the micro-arc oxidation is used to improve the strength and wear resistance of the titanium alloy, after adding nano-aluminum oxide in the composite electrolyte, the surface quality, thickness, microhardness and wear resistance of the micro-arc oxidation film layer are improved, in order to make the nano-aluminum oxide uniformly distributed on the surface of the titanium alloy, the nano-aluminum oxide is modified, an aluminum-based framework MOFs with 5,10,15,20-(4-carboxylphenyl) porphyrin as a ligand is constructed on the surface of the nano-aluminum oxide by using a hydrothermal method, the moving rate of the nano-aluminum oxide in the composite electrolyte is improved, in order to further improve the corrosion resistance, a MOFs-On-MOFs strategy is used to grow ZIF-8 with 2-methyl imidazole as a ligand on the surface of the aluminum-based framework MOFs, the synthesized composite MOFs are used as containers of the corrosion inhibitor, the bisschiff base corrosion inhibitor containing mercapto is loaded into the composite MOFs by using a negative pressure method, so that the mechanical properties, corrosion resistance and antibacterial property of the luggage rack are greatly improved, wherein the bisschiff base corrosion inhibitor containing mercapto is prepared by using glutathione and p-phenylenedimethylene as raw materials, condensation to form the corrosion inhibitor containing mercapto, carboxyl and imine bond with many adsorption groups and long molecular chains, and the bisschiff base corrosion inhibitor containing mercapto has high corrosion inhibition efficiency.

[0091] Comparing example 3 with comparative example 2 and comparative example 3, the application uses trimethylolpropane triglycidyl ether as an epoxy monomer, uses a thiol-containing double Schiff base corrosion inhibitor containing a dynamic imine bond as a rigid crosslinking agent, and uses 3,3-dithiodipropionic acid containing a dynamic disulfide bond as a flexible crosslinking agent, through the click reaction of epoxy-thiol and the esterification addition of epoxy-carboxyl, by adjusting the proportion, a self-repairing prepolymer with a variety of dynamic covalent bonds and hydrogen bond combined network structure is obtained, then composite nano-aluminum oxide is used as a toughening agent, metal bond coordination is introduced, a complex self-repairing network system is constructed, the self-repairing rate is accelerated under light, an antibacterial surface with mechanical durability, weather resistance and corrosion resistance is constructed on the surface of titanium alloy, and therefore the service life of the titanium alloy is prolonged.

[0092] In summary, the application prepares a high-strength titanium alloy luggage rack, which has good application prospect.

[0093] The above is only an embodiment of the application, and does not limit the patent range of the application, and any equivalent structural transformation made by the application specification, or direct / indirect application in other related technical fields under the inventive concept of the application is included in the patent protection range of the application.

Claims

1. A process for the production of a high-strength titanium alloy luggage rack, characterized in that, Comprise the following steps: S1: take TC4 titanium alloy bar as luggage rack base material, draw bending forming, sawing, milling, drilling, deburring, polishing, cleaning, drying, get the base material; S2: the base material is sequentially washed with alkali, sanded, and then placed in a composite electrolyte for micro-arc oxidation to obtain a pretreated base material; S3: a sealing coating is prepared from composite nano-alumina, self-repairing prepolymer and curing agent; The sealing coating comprises, by weight fraction: 1-4 parts of composite nano-alumina, 18-21 parts of self-repairing prepolymer and 1-3 parts of curing agent; S4: the sealing coating is coated on the pretreated base material and cured to obtain a high-strength titanium alloy luggage rack; The composite electrolyte comprises, by weight fraction: 7.8 g / L of sodium silicate, 3.2 g / L of sodium hexametaphosphate, 0.9 g / L of sodium hydroxide, 6 mL / L of glycerol and 5 g / L of composite nano-alumina, with deionized water as the solvent. The preparation of the composite nano-alumina comprises the following steps: (1) mix pyrrole, 4-(methylsulfonyl) benzoic acid and propionic acid, heat at 133-135℃ for 2h, cool, add methanol, stir in an ice bath for 20-30min, filter, wash and dry to obtain 5,10,15,20-(4-carboxyphenyl) porphyrin; (2) mix 5,10,15,20-(4-carboxyphenyl) porphyrin, aluminum chloride hexahydrate and deionized water, heat and stir for 25-30min, transfer to a reaction kettle, heat at 178-182℃ for 2-4h, add a mixture of nano-alumina and deionized water, continue to heat for 8-10h, cool, centrifuge, wash and dry to obtain modified nano-alumina; (3) mix the modified nano-alumina, 2-methylimidazole and methanol, add a mixture of zinc nitrate hexahydrate and methanol, continue to stir for 10-12h, dry, add a mixture of the thiol-containing bis-Schiff base corrosion inhibitor and acetone, transfer to a vacuum drying oven and place for 25-30min, reduce the air pressure in the vacuum oven to 0.04-0.07MPa, centrifuge, continue to disperse in the mixture of the thiol-containing bis-Schiff base corrosion inhibitor and acetone, repeat the dispersion operation for 3-5 times, rotary evaporate and dry to obtain the composite nano-alumina; The preparation of the self-repairing prepolymer comprises the following steps: mix trimethylolpropane triglycidyl ether, the thiol-containing bis-Schiff base corrosion inhibitor and 3,3-dithiodipropionic acid, add a mixture of 4-dimethylaminopyridine, imidazole and tetrahydrofuran, ultrasonic stir for 1-2h, then heat at 18-25℃ for 1-2h, discharge to obtain the self-repairing prepolymer; The preparation of the thiol-containing bis-Schiff base corrosion inhibitor comprises the following steps: Mix glutathione, sodium hydroxide and anhydrous ethanol, heat to 30-35℃, add a mixture of ethanol and terephthalic acid, cool, suction filter, wash with anhydrous ethanol for 3-5 times, grind to obtain the thiol-containing bis-Schiff base corrosion inhibitor.

2. The process for producing a high-strength titanium alloy luggage rack according to claim 1, wherein The solution used for alkali washing is one or a combination of sodium hydroxide, potassium hydroxide and sodium bicarbonate.

3. The process for making a high strength titanium alloy luggage rack according to claim 1, wherein, The working conditions for micro-arc oxidation are as follows: oxidation voltage is 600V, pulse frequency is 600Hz, pulse duty cycle is 18%, and oxidation time is 15min.

4. The process of claim 1, wherein the process is characterized by: The curing agent is an amine curing agent.

5. A high-strength titanium alloy luggage rack characterized by, Prepared by the process of any one of claims 1-4.