A wear-resistant and long-life aluminum alloy material for textile machinery and its preparation method

Abstract

The present invention relates to the field of textile machinery manufacturing technology, and discloses a wear-resistant and long-life aluminum alloy material for textile machinery and a preparation method thereof. The preparation method of the wear-resistant and long-life aluminum alloy material for textile machinery comprises the following steps: treating the aluminum alloy to obtain a pretreated aluminum alloy; subjecting the pretreated aluminum alloy to an oxidation treatment to obtain a micro-arc oxidized aluminum alloy; reacting a corrosion-inhibiting component obtained by reacting chitosan with 4-pyridine formaldehyde with perfluoropolyether diol to obtain a bifunctional composite material; adding ethyl orthosilicate and a hydrochloric acid aqueous solution to ethanol, and then adding the bifunctional composite material to obtain a silica composite gel; first loading the silica composite gel on the micro-arc oxidized aluminum alloy, and then coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating to obtain a wear-resistant and long-life aluminum alloy material for textile machinery. The wear-resistant and long-life aluminum alloy material for textile machinery of the present invention has excellent wear resistance and corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of textile machinery manufacturing, in particular to a wear-resistant and long-life aluminum alloy material for textile machinery and a preparation method thereof. Background Art

[0002] Aluminum is a silvery-white light metal, a main group element in the third period of the periodic table, with atomic number 13. It has an FCC face-centered cubic lattice and no allotropic transformations. It has a melting point of 660°C and a boiling point of 2327°C. Aluminum is one of the most abundant elements in the earth's crust, ranking after oxygen and silicon. Aluminum has a low density of only 2.7g / cm 3 , soft texture, good ductility, and good electrical and thermal conductivity. Aluminum easily reacts with oxygen in the air to produce a thin aluminum oxide layer, which further protects the surface of the substrate. However, the poor mechanical properties of pure aluminum limit its practical application. Therefore, in order to cope with the shortcomings of pure aluminum, it is often necessary to add some specific elements to aluminum to form an alloy phase to enhance its mechanical properties, mechanical properties and corrosion resistance. Aluminum alloys are widely used in daily life and industrial fields due to their low density, high strength, good corrosion resistance, good processing and forming properties, and good welding properties. However, due to the defects of aluminum alloys such as soft texture, poor wear resistance, and rapid decline in corrosion resistance when serving in harsh corrosive environments, their service life is reduced. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery, comprising the following steps:

[0004] Step (1) subjecting the aluminum alloy to annealing, multi-stage laser shot peening, and light polishing, and then cleaning and drying to obtain a pretreated aluminum alloy;

[0005] In the above process, annealing can not only control the grain size of the aluminum alloy, but also reduce the number of voids and defects in the aluminum alloy, which helps to improve the strength and durability of the aluminum alloy. Annealing can also improve the formability and processing properties of the aluminum alloy, making the subsequent laser shot peening treatment smoother.

[0006] During the multi-stage laser shot peening process, the shock wave generated by the direct interaction between the laser and the aluminum alloy material is the primary shock wave, and the shock wave transmitted to the sample surface through the metal mesh is the secondary shock wave, thus achieving multi-stage laser shot peening of the aluminum alloy. Shot peening can not only cause grain refinement, improve the mechanical strength of the aluminum alloy, and reduce the adverse effects of subsequent micro-arc oxidation on the fatigue resistance of the aluminum alloy, but also improve the chemical reaction activity of the aluminum alloy surface through grain refinement, thereby promoting the micro-arc oxidation process.

[0007] Light polishing after multi-stage laser shot peening can reduce the adverse effects of surface roughness and defects to maximize the benefits of shot peening on the fatigue performance and mechanical strength of micro-arc oxidation coated aluminum alloy.

[0008] Step (2) mixing sodium silicate, sodium phosphate, sodium fluoride, potassium fluorotitanate, niobium carbide nanoparticles, and deionized water to obtain a base solution, placing the pretreated aluminum alloy into the base solution for oxidation treatment, and then washing and drying to obtain a micro-arc oxidized aluminum alloy;

[0009] In the above process, a micro-arc oxidation film is formed on the surface of the aluminum alloy by performing micro-arc oxidation treatment on the aluminum alloy, thereby obtaining a micro-arc oxidation aluminum alloy.

[0010] Step (3) mixing the chitosan dispersion and the 4-pyridine formaldehyde dispersion, reflux reaction, centrifugation, washing, and drying to obtain a corrosion inhibition component; adding the corrosion inhibition component to ethanol, ultrasonic treatment, and then adding perfluoropolyether diol, heating, stirring reaction, centrifugation, washing, and drying to obtain a dual-functional composite material;

[0011] In the above process, the amino group in chitosan reacts with the aldehyde group in 4-pyridinecarboxaldehyde to obtain a corrosion-inhibiting component. The hydroxyl group in the corrosion-inhibiting component is connected with the hydroxyl group of perfluoropolyether diol through hydrogen bonds to obtain a dual-functional composite material with corrosion inhibition and lubrication functions.

[0012] Step (4) adding tetraethyl orthosilicate and hydrochloric acid aqueous solution into ethanol, then adding the bifunctional composite material dispersion, stirring, standing, and drying to obtain a silica composite gel;

[0013] In the above process, silica gel was prepared using tetraethyl orthosilicate as a precursor, and a silica composite gel with a core-shell structure encapsulating the bifunctional composite material was obtained by mixing the bifunctional composite material dispersion with the silica gel.

[0014] Step (5) mixing the silica composite gel with ethanol to obtain a mixed solution; immersing the micro-arc oxidized aluminum alloy in the mixed solution, placing it in a negative pressure environment, then taking it out and drying it to obtain a gel-loaded micro-arc oxidized aluminum alloy; coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating, and drying it to obtain a wear-resistant and long-life aluminum alloy material for textile machinery.

[0015] Preferably, in the step (1), the annealing method is: annealing the aluminum alloy in a vacuum environment at a temperature of 350-400°C for 2-2.5h; the conditions for the multi-stage laser shot peening are: the laser wavelength is 1064nm, the pulse duration is 10-20ns, the pulse frequency is 4-6Hz, the single pulse energy is 1-2J, the spot size is 1-2mm, the spot overlap rate is 50%, the constraint layer includes deionized water, and the thickness of the constraint layer is 3-5mm; in the multi-stage laser shot peening process, a 316 stainless steel metal mesh with an aperture of 250×425μm and a thickness of 80μm is used as an auxiliary structure for the multi-stage laser shock peening.

[0016] Preferably, in step (1), the light polishing method is: the aluminum alloy after multi-stage laser shot peening is treated with 400# and 800# waterproof sandpaper and nylon cloth in sequence; the cleaning method is: ultrasonic cleaning is performed using ethanol as a washing liquid; and the drying condition is: hot air drying at 60-80°C.

[0017] Preferably, in step (2), the concentrations of the components in the base solution are: sodium silicate 6-10 g / L, sodium phosphate 6-10 g / L, sodium fluoride 1.5-2 g / L, potassium fluorotitanate 3-5 g / L, and niobium carbide nanoparticles 3-5 g / L; the oxidation treatment method is: heating the base solution to 30-35°C, placing the pretreated aluminum alloy in the base solution, and oxidizing the base solution at a constant current density of 8-10 A / dm 2 The oxidation treatment is carried out for 10-20 minutes under the conditions of a duty cycle of 20-30% and a pulse frequency of 300-400 Hz.

[0018] Preferably, in step (3), the chitosan dispersion is obtained by mixing chitosan and 1wt% acetic acid aqueous solution in a ratio of 0.5-0.75kg:10-20L; the 4-pyridinecarboxaldehyde dispersion is obtained by mixing 4-pyridinecarboxaldehyde and ethanol in a ratio of 0.25-0.5kg:250-600L; and the reflux reaction conditions are: reflux reaction at 50-65°C for 6-7.5h.

[0019] Preferably, in step (3), the usage ratio of the corrosion inhibition component, ethanol, and perfluoropolyether diol is 0.5-1kg:500-1000L:0.15-0.25kg; the ultrasonic treatment conditions are: ultrasonic treatment at a frequency of 20-40KHz for 40-60min; the heating temperature is 25-35°C; and the stirring reaction conditions are: stirring at a speed of 300-500r / min for 3-5h.

[0020] Preferably, in the step (4), the bifunctional composite material dispersion is obtained by mixing the bifunctional composite material and methanol in a dosage ratio of 0.2-0.4kg:50-80L; the concentration of the hydrochloric acid aqueous solution is 0.1mol / L; the dosage ratio of the bifunctional composite material, ethyl orthosilicate, hydrochloric acid aqueous solution, and ethanol is 0.2-0.4kg:2-4kg:0.5-1L:100-200L; stirring conditions: stirring at a speed of 200-400r / min at room temperature for 14-18h; storage time: 9-11 days; drying conditions: rotary evaporation at 50-60°C.

[0021] Preferably, it is characterized in that, in the step (5), the mixing conditions of the silica composite gel and ethanol are as follows: the silica composite gel and ethanol are mixed in a mass ratio of 1:5-10, and ultrasonic treatment is performed at a frequency of 20-40KHz for 20-40min; the pressure of the negative pressure environment is (-0.12)-(0.08)MPa; the standing time is 5-10min; and the drying conditions are hot air drying at 60-80°C.

[0022] Preferably, in step (5), in the epoxy resin coating: the epoxy resin includes epoxy resin E51, and the curing agent includes BASF Baxxodur EC331 curing agent; and the mass ratio of the epoxy resin to the curing agent is 1:0.9-1.2.

[0023] The wear-resistant and long-life aluminum alloy material for textile machinery is prepared by adopting the preparation method of the wear-resistant and long-life aluminum alloy material for textile machinery.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention prepares a wear-resistant and long-life aluminum alloy material for textile machinery by sequentially pretreating, micro-arc oxidation, gel-loaded sealing, and epoxy resin coating the aluminum alloy material. The pretreatment before micro-arc oxidation includes annealing, multi-stage laser shot peening, and light polishing. The three treatment methods promote each other, not only ensuring the performance of the aluminum alloy to the greatest extent, but also better improving the effect of subsequent micro-arc oxidation treatment. Furthermore, the multi-stage shock wave induced by the pulsed laser produces a multi-level heterogeneous gradient structure on the sample surface. In actual process, the surface structure of the aluminum alloy can be controlled by adjusting the mesh size of the stainless steel metal mesh, thereby better improving the wear resistance and corrosion resistance of the aluminum alloy.

[0026] 2. In the process of micro-arc oxidation of aluminum alloy, potassium fluorotitanate and niobium carbide nanoparticles are added to the base liquid solution. The titanium dioxide sol generated by potassium fluorotitanate can effectively seal the surface pores. At the same time, titanium dioxide participates in the electrochemical reaction, resulting in an increase in the thickness and operating voltage of the micro-arc oxidation film, accelerating the growth rate of the micro-arc oxidation film, and improving the wear resistance and corrosion resistance of the aluminum alloy while reducing the energy consumption of the micro-arc oxidation treatment. Furthermore, the niobium carbide nanoparticles in the base solution migrate toward the anode under the action of an external electric field and form an aggregate layer on the anode surface, so that the niobium carbide particles adhere to the surface of the oxide film of the micro-arc oxidation, accelerating the growth of the micro-arc oxidation film, and forming a dense, uniform, and stable micro-arc oxidation film, thereby further improving the wear resistance and corrosion resistance of the aluminum alloy and extending its service life.

[0027] 3. The present invention encapsulates the bifunctional composite material with silica gel to obtain silica composite gel, and loads the silica composite gel on the micro-arc oxidized aluminum alloy. The silica composite gel can not only seal the micropores and cracks on the surface of the micro-arc oxidized aluminum alloy, but more importantly, the silica composite gel in the micropores is closer to the metal substrate of the aluminum alloy, which helps to adsorb the bifunctional composite material on the surface of the aluminum alloy, and chelate with the metal ions in the aluminum alloy to form a protective film in the defect area, giving the coating system better corrosion resistance, lubrication and self-healing properties. In addition, the silica composite gel can also be evenly dispersed in the epoxy resin coating to improve the density of the epoxy resin coating, thereby providing better protection for the aluminum alloy, obtaining a wear-resistant and durable aluminum alloy material, so as to achieve better application in textile machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a process flow chart for preparing the wear-resistant and long-life aluminum alloy material for textile machinery of the present invention;

[0029] Figure 2 This is a comparison chart of friction coefficient tests of wear-resistant and long-life aluminum alloy materials for textile machinery of Examples 1-3 and Comparative Examples 1-5 of the present invention;

[0030] Figure 3 This is a comparison chart of hardness tests of wear-resistant and long-life aluminum alloy materials for textile machinery of Examples 1-3 and Comparative Examples 1-5 of the present invention;

[0031] Figure 4 This is a comparison chart of polarization resistance tests of wear-resistant and long-life aluminum alloy materials for textile machinery of Examples 1-3 and Comparative Examples 1-5 of the present invention;

[0032] Figure 5 Schematic diagram of the synthesis of the sustained-release component of the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment discloses a method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery, comprising the following steps:

[0036] Step (1) annealing the aluminum alloy at a temperature of 350° C. in a vacuum environment for 2 hours, and then performing multi-stage laser shot peening on the annealed aluminum alloy, wherein, during the multi-stage laser shot peening process, a 316 stainless steel metal mesh with an aperture of 250×425 μm and a thickness of 80 μm is used as an auxiliary structure of the multi-stage laser shock peening, the laser wavelength is 1064 nm, the pulse duration is 10 ns, the pulse frequency is 4 Hz, the single pulse energy is 1 J, the spot size is 1 mm, the spot overlap rate is 50%, the constraint layer includes deionized water, and the thickness of the constraint layer is 3 mm; the aluminum alloy after the multi-stage laser shot peening is lightly polished with 400# and 800# waterproof sandpaper and nylon cloth in sequence, and then ultrasonically cleaned in ethanol, and finally hot-air dried at 60° C. to obtain a pretreated aluminum alloy.

[0037] Step (2) Sodium silicate, sodium phosphate, sodium fluoride, potassium fluorotitanate, niobium carbide nanoparticles, and deionized water are mixed to obtain a base solution, wherein the concentrations of the components in the base solution are: 6 g / L sodium silicate, 6 g / L sodium phosphate, 1.5 g / L sodium fluoride, 3 g / L potassium fluorotitanate, and 3 g / L niobium carbide nanoparticles; the base solution is heated to 30° C., the pretreated aluminum alloy is placed in the base solution, and the solution is stirred at a constant current density of 8 A / dm 2 The aluminum alloy was oxidized for 10 min under the conditions of a duty cycle of 20% and a pulse frequency of 300 Hz, and then ultrasonically cleaned with deionized water and dried with hot air at 60°C to obtain a micro-arc oxidized aluminum alloy.

[0038] Step (3) dissolving 0.5 kg of chitosan in 10 L of 1 wt% acetic acid aqueous solution to obtain a chitosan dispersion; dispersing 0.25 kg of 4-pyridinecarboxaldehyde in 250 L of ethanol to obtain a 4-pyridinecarboxaldehyde dispersion; mixing the chitosan dispersion with the 4-pyridinecarboxaldehyde dispersion, stirring and reflux at 50 ° C for 6 hours, cooling to room temperature after the reaction, centrifuging, and repeatedly washing the obtained centrifugal product with ethanol and deionized water for 3 times, and then drying at 40 ° C for 20 hours to obtain a corrosion inhibition component; adding 0.5 kg of the corrosion inhibition component to 500 L of ethanol, ultrasonically treating it at 20 KHz for 40 minutes, and then adding 0.15 kg of perfluoropolyether diol, heating to 25 ° C, stirring at a speed of 300 r / min for 3 hours, and centrifuging. The obtained centrifugal product is repeatedly washed with ethanol and deionized water for 5 times, and then dried at 40 ° C for 20 hours to obtain a dual-functional composite material.

[0039] Step (4) dispersing 0.2 kg of the bifunctional composite material in 50 L of methanol to obtain a bifunctional composite material dispersion; adding 2 kg of ethyl orthosilicate and 0.5 L of a 0.1 mol / L hydrochloric acid aqueous solution to 100 L of ethanol, and then adding the bifunctional composite material dispersion, first stirring at room temperature at a speed of 200 r / min for 14 h, then leaving it at room temperature for 9 days, and finally drying it by rotary evaporation at 50° C. to obtain a silica composite gel.

[0040] Step (5) mixing the silica composite gel and ethanol in a mass ratio of 1:5, ultrasonically treating the mixture at a frequency of 20 kHz for 20 minutes to obtain a mixed solution; immersing the micro-arc oxidized aluminum alloy in the mixed solution, placing the mixture in a vacuum environment at a pressure of -0.12 MPa for 5 minutes, taking the mixture out, and then hot-air drying the mixture at 60°C to obtain a gel-loaded micro-arc oxidized aluminum alloy; coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating, and hot-air drying the mixture at 60°C to obtain a wear-resistant and long-life aluminum alloy material for textile machinery; wherein the epoxy resin coating comprises a mass ratio of epoxy resin E51 to BASF Baxxodur EC331 curing agent of 1:0.9.

[0041] Example 2

[0042] This embodiment discloses a method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery, comprising the following steps:

[0043] Step (1) annealing the aluminum alloy in a vacuum environment at a temperature of 400°C for 2.5 hours, and then performing multi-stage laser shot peening on the annealed aluminum alloy, wherein, during the multi-stage laser shot peening process, a 316 stainless steel metal mesh with an aperture of 250×425μm and a thickness of 80μm is used as an auxiliary structure of the multi-stage laser shock peening, the laser wavelength is 1064nm, the pulse duration is 20ns, the pulse frequency is 6Hz, the single pulse energy is 2J, the spot size is 2mm, the spot overlap rate is 50%, the constraint layer includes deionized water, and the thickness of the constraint layer is 5mm; the aluminum alloy after the multi-stage laser shot peening is lightly polished with 400# and 800# waterproof sandpaper and nylon cloth in sequence, and then ultrasonically cleaned in ethanol, and finally hot air dried at 80°C to obtain a pretreated aluminum alloy.

[0044] Step (2) Sodium silicate, sodium phosphate, sodium fluoride, potassium fluorotitanate, niobium carbide nanoparticles, and deionized water are mixed to obtain a base solution, wherein the concentrations of the components in the base solution are: sodium silicate 10 g / L, sodium phosphate 10 g / L, sodium fluoride 2 g / L, potassium fluorotitanate 5 g / L, and niobium carbide nanoparticles 5 g / L; the base solution is heated to 35° C., the pretreated aluminum alloy is placed in the base solution, and the solution is stirred at a constant current density of 10 A / dm 2 The aluminum alloy was oxidized for 20 min under the conditions of a duty cycle of 30% and a pulse frequency of 400 Hz, and then ultrasonically cleaned with deionized water and dried with hot air at 80°C to obtain a micro-arc oxidized aluminum alloy.

[0045] Step (3) dissolving 0.75 kg of chitosan in 20 L of 1 wt% acetic acid aqueous solution to obtain a chitosan dispersion; dispersing 0.5 kg of 4-pyridinecarboxaldehyde in 600 L of ethanol to obtain a 4-pyridinecarboxaldehyde dispersion; mixing the chitosan dispersion with the 4-pyridinecarboxaldehyde dispersion, stirring and reflux at 65 ° C for 7.5 hours, cooling to room temperature after the reaction, centrifuging, and repeatedly washing the obtained centrifugal product with ethanol and deionized water for 5 times, and then drying at 60 ° C for 30 hours to obtain a corrosion inhibition component; adding 1 kg of the corrosion inhibition component to 1000 L of ethanol, ultrasonically treating it at 40 KHz for 60 minutes, and then adding 0.25 kg of perfluoropolyether diol, heating to 35 ° C, stirring at a speed of 500 r / min for 5 hours, and centrifuging. The obtained centrifugal product is repeatedly washed with ethanol and deionized water for 8 times, and then dried at 60 ° C for 30 hours to obtain a dual-functional composite material.

[0046] Step (4) dispersing 0.4 kg of the bifunctional composite material in 80 L of methanol to obtain a bifunctional composite material dispersion; adding 4 kg of ethyl orthosilicate and 1 L of 0.1 mol / L hydrochloric acid aqueous solution to 200 L of ethanol, and then adding the bifunctional composite material dispersion, first stirring at room temperature at a speed of 400 r / min for 18 hours, then leaving it at room temperature for 11 days, and finally drying it by rotary evaporation at 60° C. to obtain a silica composite gel.

[0047] Step (5) mixing the silica composite gel and ethanol in a mass ratio of 1:10, ultrasonically treating the mixture at a frequency of 40 kHz for 40 minutes to obtain a mixed solution; immersing the micro-arc oxidized aluminum alloy in the mixed solution, placing the mixture in a vacuum environment at a pressure of -0.08 MPa for 10 minutes, taking the mixture out, and then hot-air drying the mixture at 80°C to obtain a gel-loaded micro-arc oxidized aluminum alloy; coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating, and hot-air drying the mixture at 80°C to obtain a wear-resistant and long-life aluminum alloy material for textile machinery; wherein the mass ratio of epoxy resin E51 to BASF Baxxodur EC331 curing agent in the epoxy resin coating is 1:1.2.

[0048] Example 3

[0049] This embodiment discloses a method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery, comprising the following steps:

[0050] Step (1) annealing the aluminum alloy at a temperature of 380°C in a vacuum environment for 2.3 hours, and then performing multi-stage laser shot peening on the annealed aluminum alloy, wherein, during the multi-stage laser shot peening process, a 316 stainless steel metal mesh with an aperture of 250×425μm and a thickness of 80μm is used as an auxiliary structure of the multi-stage laser shock peening, the laser wavelength is 1064nm, the pulse duration is 15ns, the pulse frequency is 5Hz, the single pulse energy is 1.5J, the spot size is 1.5mm, the spot overlap rate is 50%, the constraint layer includes deionized water, and the thickness of the constraint layer is 4mm; the aluminum alloy after the multi-stage laser shot peening is lightly polished with 400# and 800# waterproof sandpaper and nylon cloth in sequence, and then ultrasonically cleaned in ethanol, and finally hot air dried at 70°C to obtain a pretreated aluminum alloy.

[0051] Step (2) Sodium silicate, sodium phosphate, sodium fluoride, potassium fluorotitanate, niobium carbide nanoparticles, and deionized water are mixed to obtain a base solution, wherein the concentrations of the components in the base solution are: sodium silicate 8 g / L, sodium phosphate 8 g / L, sodium fluoride 1.8 g / L, potassium fluorotitanate 4.5 g / L, and niobium carbide nanoparticles 4 g / L; the base solution is heated to 33° C., the pretreated aluminum alloy is placed in the base solution, and the solution is stirred at a constant current density of 9 A / dm 2The aluminum alloy was oxidized for 15 min under the conditions of a duty cycle of 25% and a pulse frequency of 350 Hz, and then ultrasonically cleaned with deionized water and dried with hot air at 70°C to obtain a micro-arc oxidized aluminum alloy.

[0052] Step (3) dissolving 0.65 kg of chitosan in 15 L of 1 wt% acetic acid aqueous solution to obtain a chitosan dispersion; dispersing 0.35 kg of 4-pyridinecarboxaldehyde in 400 L of ethanol to obtain a 4-pyridinecarboxaldehyde dispersion; mixing the chitosan dispersion with the 4-pyridinecarboxaldehyde dispersion, stirring and reflux at 60 ° C for 6.5 hours, cooling to room temperature after the reaction, centrifuging, and repeatedly washing the obtained centrifugal product with ethanol and deionized water for 4 times, and then drying at 50 ° C for 25 hours to obtain a corrosion inhibition component; adding 0.8 kg of the corrosion inhibition component to 800 L of ethanol, ultrasonically treating it at 30 KHz for 50 minutes, and then adding 0.2 kg of perfluoropolyether diol, heating to 30 ° C, stirring at a speed of 400 r / min for 4 hours, and centrifuging. The obtained centrifugal product is repeatedly washed with ethanol and deionized water for 7 times, and then dried at 50 ° C for 25 hours to obtain a dual-functional composite material.

[0053] Step (4) dispersing 0.3 kg of the bifunctional composite material in 65 L of methanol to obtain a bifunctional composite material dispersion; adding 3 kg of ethyl orthosilicate and 0.8 L of a 0.1 mol / L hydrochloric acid aqueous solution to 150 L of ethanol, and then adding the bifunctional composite material dispersion, first stirring at room temperature at a speed of 300 r / min for 16 hours, then leaving it at room temperature for 10 days, and finally drying it by rotary evaporation at 55° C. to obtain a silica composite gel.

[0054] Step (5) mixing the silica composite gel and ethanol in a mass ratio of 1:7.5, ultrasonically treating the mixture at a frequency of 30 kHz for 30 minutes to obtain a mixed solution; immersing the micro-arc oxidized aluminum alloy in the mixed solution, placing the mixture in a vacuum environment at a pressure of -0.1 MPa for 8 minutes, taking it out, and then hot-air drying it at 70°C to obtain a gel-loaded micro-arc oxidized aluminum alloy; coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating, and hot-air drying it at 70°C to obtain a wear-resistant and long-life aluminum alloy material for textile machinery; wherein the epoxy resin coating has a mass ratio of epoxy resin E51 to BASF Baxxodur EC331 curing agent of 1:1.

[0055] Comparative Example 1

[0056] Comparative Example 1 Compared with Example 3, Comparative Example 1 does not use the auxiliary structure of the 316 stainless steel metal mesh in the multi-stage laser shot peening treatment in the pretreatment of the aluminum alloy, and other conditions remain unchanged.

[0057] Comparative Example 2

[0058] Comparative Example 2 Compared with Example 3, in Comparative Example 2, during the process of preparing the micro-arc oxidation aluminum alloy, potassium fluorotitanate was not added to the base solution, and other conditions remained unchanged.

[0059] Comparative Example 3

[0060] Comparative Example 3 Compared with Example 3, in Comparative Example 3, during the process of preparing the micro-arc oxidation aluminum alloy, no niobium carbide nanoparticles were added to the base solution, and other conditions remained unchanged.

[0061] Comparative Example 4

[0062] Compared with Example 3, in Comparative Example 4, in step (5) of preparing the wear-resistant and long-life aluminum alloy material for textile machinery, micro-arc oxidation aluminum alloy is used instead of gel-loaded micro-arc oxidation aluminum alloy (that is, the wear-resistant and long-life aluminum alloy material for textile machinery does not contain silica composite gel), and other conditions remain unchanged.

[0063] Comparative Example 5

[0064] Comparative Example 5 Compared with Example 3, in Comparative Example 5, ordinary silica gel is used instead of silica composite gel in step (5) of preparing wear-resistant and long-life aluminum alloy material for textile machinery (i.e., the dual-functional composite material is not encapsulated in the silica gel), and other conditions remain unchanged.

[0065] In the above embodiments and comparative examples, the aluminum alloy is 6063 aluminum alloy, and the content of each component is: Si 0.20%, Cu 0.015%, Fe 0.25%, and the balance is Al; the molecular weight of the perfluoropolyether diol is 1000-2000.

[0066] Experimental example

[0067] Performance tests were performed on samples of wear-resistant and long-life aluminum alloy materials for textile machinery prepared in Examples 1-3 and Comparative Examples 1-5.

[0068] 1. Wear resistance test

[0069] 1. Friction coefficient test: Wear resistance was tested using an HSR-2M reciprocating friction and wear tester. SiN grinding balls with a diameter of 4 mm were used, and the friction specimens were 20 mm × 20 mm × 3 mm in size. A load of 5 N and a friction speed of 10 mm / sec were used. The surfaces were cleaned with anhydrous ethanol before and after the test and dried before use.

[0070] 2. Hardness test: Use a microhardness tester to measure the microhardness for 10 seconds under a load of 0.5N. The test results are shown in Table 1:

[0071] Table 1

[0072] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Friction coefficient 0.102 0.093 0.096 0.108 0.109 0.110 0.124 0.118 Hardness / HV 1695 1718 1703 1677 1670 1665 1677 1683

[0073] The test results in Table 1 show that the wear-resistant, long-life aluminum alloy materials for textile machinery prepared in Examples 1-3 of the present invention exhibit excellent wear resistance. A comparison of Comparative Example 1 with Example 3 shows that multi-stage laser shot peening of the pretreated aluminum alloy using a 316 stainless steel mesh as an auxiliary structure can improve its wear resistance. A comparison of Comparative Examples 2 and 3 with Example 3 shows that the addition of potassium fluorotitanate and niobium carbide particles to the base solution can enhance the wear resistance of the aluminum alloy by improving the effect of micro-arc oxidation. A comparison of Comparative Examples 4 and 5 with Example 3 shows that loading silica gel onto the aluminum alloy can improve its wear resistance, and the silica composite gel encapsulated with the dual-functional composite material has a more significant effect on the performance of the aluminum alloy.

[0074] 2. Corrosion resistance test: Electrochemical analysis was performed using a three-electrode electrochemical cell system (CHI660E), including a working electrode (aluminum alloy sample), a reference electrode (saturated calomel electrode), and an auxiliary electrode (platinum sheet). Before the electrochemical impedance spectroscopy (EIS) test, the working electrode should be immersed in the corrosive solution for at least 1 hour to ensure the stability of the open circuit potential (OCP). Next, EIS was performed in the frequency range of 100 kHz to 0.01 Hz with a corrosion potential deviation of 5 mV. In addition, the EIS data were fitted to a suitable equivalent circuit to obtain the polarization resistance value. The test results are shown in Table 2:

[0075] Table 2

[0076]

[0077] The test results in Table 2 show that the wear-resistant, long-life aluminum alloy materials for textile machinery prepared in Examples 1-3 of the present invention have excellent corrosion resistance. A comparison of Comparative Example 1 with Example 3 shows that multi-stage laser shot peening of the pretreated aluminum alloy using a 316 stainless steel mesh as an auxiliary structure can improve its corrosion resistance. A comparison of Comparative Examples 2 and 3 with Example 3 shows that the addition of potassium fluorotitanate and niobium carbide particles to the base solution can enhance the corrosion resistance of the aluminum alloy. A comparison of Comparative Examples 4 and 5 with Example 3 shows that loading silica gel on the aluminum alloy can improve the corrosion resistance of the aluminum alloy. The silica composite gel encapsulated with the dual-functional composite material can further improve the corrosion resistance of the aluminum alloy due to the encapsulated dual-functional composite material.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery, characterized in that: The following steps are involved: Step (1) subjecting the aluminum alloy to annealing, multi-stage laser shot peening, and light polishing, and then cleaning and drying to obtain a pretreated aluminum alloy; During the multi-stage laser shot peening process, a 316 stainless steel metal mesh with an aperture of 250×425μm and a thickness of 80μm was used as an auxiliary structure for multi-stage laser shock peening. The shock wave generated by the direct interaction between the laser and the aluminum alloy material is the primary shock wave, and the shock wave transmitted to the sample surface through the metal mesh is the secondary shock wave, thus achieving multi-stage laser shot peening of the aluminum alloy. Step (2) mixing sodium silicate, sodium phosphate, sodium fluoride, potassium fluorotitanate, niobium carbide nanoparticles, and deionized water to obtain a base solution, placing the pretreated aluminum alloy into the base solution for oxidation treatment, and then washing and drying to obtain a micro-arc oxidized aluminum alloy; Step (3) mixing the chitosan dispersion and the 4-pyridine formaldehyde dispersion, reflux reaction, centrifugation, washing, and drying to obtain a corrosion inhibition component; adding the corrosion inhibition component to ethanol, ultrasonic treatment, and then adding perfluoropolyether diol, heating, stirring reaction, centrifugation, washing, and drying to obtain a bifunctional composite material; wherein the hydroxyl group in the corrosion inhibition component and the hydroxyl group of the perfluoropolyether diol are connected by hydrogen bonds to obtain a bifunctional composite material with corrosion inhibition and lubrication functions; Step (4) adding tetraethyl orthosilicate and hydrochloric acid aqueous solution to ethanol, then adding the bifunctional composite material dispersion, stirring, standing, and drying to obtain a silica composite gel encapsulating the bifunctional composite material and having a core-shell structure; Step (5) mixing the silica composite gel with ethanol to obtain a mixed solution; immersing the micro-arc oxidized aluminum alloy in the mixed solution, placing it in a negative pressure environment, then taking it out and drying it to obtain a gel-loaded micro-arc oxidized aluminum alloy; coating the gel-loaded micro-arc oxidized aluminum alloy with an epoxy resin coating, and drying it to obtain a wear-resistant and long-life aluminum alloy material for textile machinery.

2. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (1), the annealing method is as follows: the aluminum alloy is annealed in a vacuum environment at a temperature of 350-400°C for 2-2.5 hours; the conditions for the multi-stage laser shot peening are as follows: the laser wavelength is 1064nm, the pulse duration is 10-20ns, the pulse frequency is 4-6Hz, the single pulse energy is 1-2J, the spot size is 1-2mm, the spot overlap rate is 50%, the constrained layer includes deionized water, and the thickness of the constrained layer is 3-5mm.

3. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (1), the light polishing method is as follows: the aluminum alloy after multi-stage laser shot peening is treated with 400# and 800# waterproof sandpaper and nylon cloth in sequence; the cleaning method is as follows: ultrasonic cleaning is performed using ethanol as a washing liquid; and the drying condition is as follows: hot air drying at 60-80°C.

4. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (2), the concentrations of the components in the base solution are: sodium silicate 6-10 g / L, sodium phosphate 6-10 g / L, sodium fluoride 1.5-2 g / L, potassium fluorotitanate 3-5 g / L, and niobium carbide nanoparticles 3-5 g / L; the oxidation treatment method is: heating the base solution to 30-35°C, placing the pretreated aluminum alloy in the solution, and heating the solution at a constant current density of 8-10 A / dm 2 The oxidation treatment is carried out for 10-20 minutes under the conditions of a duty cycle of 20-30% and a pulse frequency of 300-400 Hz.

5. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (3), the chitosan dispersion is obtained by mixing chitosan and 1wt% acetic acid aqueous solution in a ratio of 0.5-0.75kg:10-20L; the 4-pyridinecarboxaldehyde dispersion is obtained by mixing 4-pyridinecarboxaldehyde and ethanol in a ratio of 0.25-0.5kg:250-600L; the reflux reaction conditions are: reflux reaction at 50-65°C for 6-7.5h.

6. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (3), the usage ratio of the corrosion inhibition component, ethanol and perfluoropolyether diol is 0.5-1kg: 500-1000L: 0.15-0.25kg; Ultrasonic treatment conditions: Ultrasonic treatment at a frequency of 20-40KHz for 40-60min; Heating temperature: 25-35°C; Stirring reaction conditions: Stirring at a speed of 300-500r / min for 3-5h.

7. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (4), the bifunctional composite material dispersion is obtained by mixing the bifunctional composite material and methanol in a dosage ratio of 0.2-0.4kg:50-80L; the concentration of the hydrochloric acid aqueous solution is 0.1mol / L; the dosage ratio of the bifunctional composite material, ethyl orthosilicate, hydrochloric acid aqueous solution, and ethanol is 0.2-0.4kg:2-4kg:0.5-1L:100-200L; the stirring condition is stirring at a speed of 200-400r / min at room temperature for 14-18h; the storage time is 9-11 days; and the drying condition is rotary evaporation drying at 50-60°C.

8. The method for preparing the wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (5), the silica composite gel and ethanol are mixed in a mass ratio of 1:5-10, and ultrasonically treated at a frequency of 20-40 kHz for 20-40 min; the pressure of the negative pressure environment is (-0.12)-(0.08) MPa; the standing time is 5-10 min; and the drying condition is hot air drying at 60-80°C.

9. The method for preparing a wear-resistant and long-life aluminum alloy material for textile machinery according to claim 1, characterized in that: In the step (5), in the epoxy resin coating: the epoxy resin includes epoxy resin E51, and the curing agent includes BASF Baxxodur EC331 curing agent; the mass ratio of the epoxy resin to the curing agent is 1:0.9-1.

2.

10. A wear-resistant and long-life aluminum alloy material for textile machinery prepared by the method according to any one of claims 1 to 9.

Images