Method for forming holes in surface of titanium alloy-aluminum alloy composite material

Abstract

The invention relates to the technical field of alloys, and discloses a titanium alloy-aluminum alloy composite material surface pore-forming method, which utilizes ultrasonic vibration to assist electric spark machining, shaking an electrode to continuously change a gap between the electrode and a workpiece, loading ultrasonic vibration, accelerating the circulation of suspension liquid and improving the machining efficiency. And the titanium alloy-aluminum alloy composite material with surface micropores is obtained. The obtained micropores are clear in outline, small in distance between the micropores, good in appearance, good in binding force with plastic and high in air tightness. The shell is applied to shells of 3C products such as notebook computers and mobile phones.

Description

Technical Field

[0001] The invention relates to the technical field of alloys, in particular to a method for forming holes on the surface of a titanium alloy-aluminum alloy composite material. Background Art

[0002] The working principle of EDM (Electrodischarge Machining) is to use a continuously moving thin metal wire as an electrode to generate pulsed spark discharges on the workpiece, instantly generating high temperatures, etching away metal, and removing surface material to facilitate cutting and shaping. EDM is primarily used to machine a variety of complex and precise workpieces. However, EDM suffers from significant electrode wear. Furthermore, as the hole depth increases, the fluid resistance in the gap between the electrode and the workpiece increases, making it difficult for chips and bubbles to be promptly expelled from the machining area. This deionization condition deteriorates, and can easily lead to abnormal discharge phenomena such as arcing and short circuits. For example, the paper "Experimental Study on Small Hole EDM of High-Nb-TiAl Alloy Based on Taguchi Test" describes the use of a D703F high-speed EDM machine tool to machine high-Nb-TiAl alloys. Using the Taguchi test method, the paper investigates the influence of EDM parameters on machining speed and quality. This study demonstrates the potential for efficient and precise machining of high-Nb-TiAl alloys.

[0003] Ultrasonic machining is a method of machining hard and brittle materials through an abrasive suspension using the tool end face as an ultrasonic frequency vibrator. Ultrasonic EDM is a composite machining process that combines ultrasonic and EDM, using ultrasonic vibration attached to the tool electrode to assist EDM. This type of machining can improve machining conditions and efficiency. For example, the paper "Research on Micro-EDM of Stainless Steel Micro-holes Based on Ultrasonic Assistance of Workpiece" reports that stainless steel is a difficult material to machine in traditional machining. EDM provides an effective machining method for it. However, during the micro-EDM process, improving machining efficiency and reducing tool electrode loss are the research focuses of micro-EDM. Introducing ultrasonic vibration of the workpiece into micro-EDM has shown that adding ultrasonic vibration to the workpiece can effectively increase the number of discharges per unit time, enhance the stability of micro-EDM, improve the efficiency of micro-hole machining, reduce tool electrode loss, and improve the surface quality of the machined surface.

[0004] Plastics are polymer compounds formed from monomers through polyaddition or polycondensation reactions. They offer advantages such as impact resistance, corrosion resistance, good insulation, and excellent thermal conductivity. However, plastics suffer from poor dimensional stability, are prone to deformation, and age easily. Casting alloy micropores with plastics can alleviate these shortcomings. The present invention utilizes ultrasonic-assisted electrospark machining to form dense, well-defined micropores on the surface of a titanium alloy-aluminum alloy composite material, significantly improving the bonding strength between the metal and the plastic. Summary of the Invention

[0005] (1) Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a method for forming pores on the surface of a titanium alloy-aluminum alloy composite material, which forms dense and well-shaped micropores on the surface of the titanium alloy-aluminum alloy composite material, and can significantly improve the bonding strength between metal and plastic.

[0006] (2) Technical solution A method for forming holes on the surface of a titanium alloy-aluminum alloy composite material, the preparation method comprising: (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy are welded on a friction stir welding machine using a welding fixture. During welding, the front side is aluminum alloy and the return side is titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0007] (2) Preparation of polishing liquid Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 2-10g / L, the concentration of sulfuric acid is 0.5-3g / L, Al 3+ The concentration of copper sulfate is 0.1-0.3 g / L, the concentration of citric acid is 4-6 g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 2-4 g / L.

[0008] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is firstly sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto for chemical polishing to obtain a polished titanium alloy-aluminum alloy composite material.

[0009] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine, and the electrode was clamped at the output end of the horn of the ultrasonic vibration device. The electrospark machining electrode was a copper electrode with a diameter of 0.2-0.5 mm. Distilled water was used as the working medium to perform electrospark machining to obtain a titanium alloy-aluminum alloy composite material with surface micropores.

[0010] Preferably, the chemical polishing process in step (3) is as follows: chemical polishing at 70-90° C. for 60-80 seconds, and staying in the air for 15-30 seconds.

[0011] Preferably, the process of ultrasonic-assisted EDM in step (4) is as follows: the electrode shaking radius is 10-20 μm, the electrode shaking speed is 25-35 μm / s, the ultrasonic vibration frequency is 45-55 kHz, and the ultrasonic amplitude is 2-6 μm.

[0012] Preferably, the process of the electrospark machining in step (4) is as follows: setting the machining voltage to 80-120V, the current to 5-20A, the capacitance to 8-12nF, the pulse width to 10-30us, and the pressure to 3-5MPa.

[0013] Preferably, the preparation method of benzimidazole benzoic acid in step (2) is: S1: Add 3,4-diaminobenzoic acid, benzaldehyde, anhydrous Na2SO4, KI and N,N-dimethylformamide solvent to a round-bottom flask, carry out microwave reaction in a microwave reactor, then add ethyl acetate and water for extraction, dry the organic phase to remove water, and recrystallize the solid crude product from ethanol to obtain benzimidazole benzoic acid.

[0014] S2: mixing o-phenylenediamine and benzimidazole benzoic acid, adding polyphosphoric acid and concentrated hydrochloric acid, and performing microwave reaction in a microwave reactor. After the reaction, cooling, filtering, washing with acetone, and recrystallizing are performed to obtain a bisbenzimidazole corrosion inhibitor.

[0015] Preferably, in step S1, the mass ratio of 3,4-diaminobenzoic acid, benzaldehyde, Na2SO4, and KI is 1:0.7-1.2:0.1-0.22:0.065-0.11.

[0016] Preferably, in step S1, the microwave power is 400-600 W, and the microwave reaction time is 20-40 min.

[0017] Preferably, in step S2, the mass ratio of o-phenylenediamine to benzimidazole benzoic acid is 0.6-0.85:1.

[0018] Preferably, in step S2, the volume ratio of polyphosphoric acid to concentrated hydrochloric acid is 1:1-1.2, and the concentration of concentrated hydrochloric acid is 25-37%.

[0019] Preferably, in step S2, the microwave power is 400-700 W, and the microwave reaction time is 20-60 min.

[0020] (3) Beneficial technical effects 3,4-Diaminobenzoic acid reacts with benzaldehyde in the presence of anhydrous Na2SO4 and KI to produce benzimidazole benzoic acid. This is then reacted with o-phenylenediamine to produce bisbenzimidazole corrosion inhibitor, which has the property of preventing or slowing down material corrosion. The configuration includes phosphoric acid, sulfuric acid, Al 3+ The polishing agent includes copper sulfate, citric acid, and bisbenzimidazole corrosion inhibitor. The polishing agent can process the surface of the workpiece to make the surface smoother and the surface brightness of the workpiece uniform. The polishing agent is used to chemically polish the titanium alloy-aluminum alloy to obtain a polished titanium alloy-aluminum alloy composite material.

[0021] Ultrasonic vibration-assisted electrospark machining (EDM) involves machining microholes to a certain depth. The viscous resistance of the fluid in the discharge gap increases, making it difficult to expel bubbles and chips. Shaking the electrode causes the gap between the electrode and the workpiece to continuously change. Applying ultrasonic vibrations, the high-frequency excitation of the electrode surface accelerates the circulation of the suspension, rapidly flowing the working fluid between the workpiece and the electrode. This changes the distance between the working fluid and the inner wall of the hole, reducing the viscous resistance of the working fluid in the gap, bursting bubbles, and facilitating the expulsion of chips from the gap. This accelerates machining speed and improves efficiency, resulting in a titanium alloy-aluminum alloy composite material with micropores on the surface. The resulting micropores exhibit minimal slag near their inlet and outlet, a small heat-affected zone, consistent hole shape, deep hole depth, and a narrow range of micropore diameter fluctuations. The micropores have clear outlines, no cracks at the edges, and close spacing between them, with good morphology. Casting with plastic provides excellent adhesion and airtightness. This composite material is suitable for use in housings for 3C products such as laptops and mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The invention relates to the preparation of bisbenzimidazole corrosion inhibitor.

[0023] Figure 2 Metallographic microscope image of micropores on the surface of titanium alloy-aluminum alloy composite material.

[0024] Figure 3 Scanning electron microscope morphology of micropores on the surface of titanium alloy-aluminum alloy composite material. DETAILED DESCRIPTION Example 1

[0025] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 900 r / min and the welding speed was 120 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0026] (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 2.1 g of benzaldehyde, 0.3 g of anhydrous Na2SO4, 0.19 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 400 W in a microwave reactor, and the reaction time was 20 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0027] 1.5 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 15 ml of 30% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 600 W and the reaction time at 40 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0028] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 2g / L, the concentration of phosphoric acid is 0.5g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.1g / L, the concentration of citric acid is 4g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 2g / L.

[0029] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 80° C. for 70 seconds, and the composite material is left in the air for 20 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0030] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 55kHz, the ultrasonic amplitude was 4μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 15μm, the electrode shaking speed was 35μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.2mm, the machining voltage was 120V, the current was 20A, the capacitance was 10nF, the pulse width was 20us, the pressure was 4MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores. Example 2

[0031] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 600 r / min and the welding speed was 100 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0032] (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 3.6 g of benzaldehyde, 0.66 g of anhydrous Na2SO4, 0.34 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 500 W in a microwave reactor and the reaction time was 30 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0033] 1.2 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 18 ml of 30% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 400 W and the reaction time at 40 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0034] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 6g / L, the concentration of sulfuric acid is 0.5g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.1g / L, the concentration of citric acid is 5g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 3g / L.

[0035] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 80° C. for 70 seconds, and the composite material is left in the air for 20 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0036] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 55kHz, the ultrasonic amplitude was 6μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 20μm, the electrode shaking speed was 35μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.5mm, the machining voltage was 100V, the current was 20A, the capacitance was 8nF, the pulse width was 20us, the pressure was 4MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores. Example 3

[0037] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 900 r / min and the welding speed was 100 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material. (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 3 g of benzaldehyde, 0.5 g of anhydrous Na2SO4, 0.3 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 500 W in a microwave reactor and the reaction time was 30 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0038] 1.2 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 12 ml of 25% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 400 W and the reaction time at 20 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0039] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 6g / L, the concentration of sulfuric acid is 2g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.2g / L, the concentration of citric acid is 5g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 3g / L.

[0040] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 70° C. for 60 seconds, and the composite material is kept in the air for 15 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0041] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 50 kHz, the ultrasonic amplitude was 4 μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 20 μm, the electrode shaking speed was 25 μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.5 mm, the machining voltage was 100 V, the current was 20 A, the capacitance was 10 nF, the pulse width was 20 us, the pressure was 4 MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores. Example 4

[0042] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 800 r / min and the welding speed was 120 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0043] (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 3 g of benzaldehyde, 0.66 g of anhydrous Na2SO4, 0.3 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 500 W in a microwave reactor and the reaction time was 20 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0044] 1.7 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 12 ml of 37% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 700 W and the reaction time at 20 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0045] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 10g / L, the concentration of sulfuric acid is 0.5g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.2g / L, the concentration of citric acid is 5g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 3g / L.

[0046] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 90° C. for 70° C. and the polished titanium alloy-aluminum alloy composite material is retained in the air for 15 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0047] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 45kHz, the ultrasonic amplitude was 4μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 15μm, the electrode shaking speed was 35μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.5mm, the machining voltage was 100V, the current was 20A, the capacitance was 8nF, the pulse width was 20us, the pressure was 4MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores. Example 5

[0048] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 800 r / min and the welding speed was 100 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0049] (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 3.6 g of benzaldehyde, 0.66 g of anhydrous Na2SO4, 0.34 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 600 W in a microwave reactor, and the reaction time was 40 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0050] 1.2 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 12 ml of 30% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 700 W and the reaction time at 40 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0051] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 6g / L, the concentration of sulfuric acid is 0.5g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.2g / L, the concentration of citric acid is 5g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 3g / L.

[0052] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 90° C. for 80 seconds, and the composite material is left in the air for 30 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0053] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 45kHz, the ultrasonic amplitude was 2μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 15μm, the electrode shaking speed was 35μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.4mm, the machining voltage was 100V, the current was 15A, the capacitance was 10nF, the pulse width was 20us, the pressure was 4MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores. Example 6

[0054] (1) Preparation of titanium alloy-aluminum alloy composite materials Aluminum alloy and titanium alloy were welded on a friction stir welding machine using a welding fixture. The stirring head rotation speed was 900 r / min and the welding speed was 140 mm / min. During welding, the front side was aluminum alloy and the return side was titanium alloy to prepare a titanium alloy-aluminum alloy composite material.

[0055] (2) Preparation of polishing liquid 3 g of 3,4-diaminobenzoic acid, 3.6 g of benzaldehyde, 0.3 g of anhydrous Na2SO4, 0.19 g of KI and N,N-dimethylformamide solvent were added to a round-bottom flask. The microwave power was controlled at 600 W in a microwave reactor, and the reaction time was 30 min. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid.

[0056] 1.7 g of o-phenylenediamine and 2 g of benzimidazole benzoic acid were stirred and mixed, and then 12 ml of polyphosphoric acid and 18 ml of 37% concentrated hydrochloric acid were added. Microwave reaction was carried out in a microwave reactor with the microwave power controlled at 700 W and the reaction time at 60 min. After the reaction was completed, the mixture was cooled, filtered, washed with acetone, and recrystallized to obtain a bisbenzimidazole corrosion inhibitor.

[0057] Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 10g / L, the concentration of sulfuric acid is 3g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.3g / L, the concentration of citric acid is 6g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 4g / L.

[0058] (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then polishing liquid is added thereto. Chemical polishing is performed at 80° C. for 70 seconds, and the composite material is left in the air for 30 seconds to obtain a polished titanium alloy-aluminum alloy composite material.

[0059] (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine. The ultrasonic vibration frequency was 45kHz, the ultrasonic amplitude was 2μm, and the electrode was clamped at the output end of the amplitude rod of the ultrasonic vibration device. The electrode shaking radius was 15μm, the electrode shaking speed was 25μm / s, the electrode diameter of the electrospark machining was a copper electrode of 0.4mm, the machining voltage was 100V, the current was 15A, the capacitance was 10nF, the pulse width was 20us, the pressure was 4MPa, and distilled water was used as the working medium. Electrospark machining was performed to obtain a titanium alloy-aluminum alloy composite material with surface micropores.

[0060] Hardness / HRA <![CDATA[Impact toughness / (J / cm 2 )]]> Example 1 85.62 3.602 Example 2 87.22 3.778 Example 3 88.19 4.654 Example 4 87.51 4.465 Example 5 86.55 4.123 Example 6 88.49 4.031 The titanium alloy-aluminum alloy composite material of Example 6 has the highest hardness, reaching 88.49HRA. The impact toughness of Example 3 is the highest, reaching 4.654J / cm 2 .

Claims

1. A method for forming holes on the surface of a titanium alloy-aluminum alloy composite material, characterized by: The preparation method is: (1) Preparation of titanium alloy-aluminum alloy composite materials The aluminum alloy and the titanium alloy are welded on a friction stir welding machine using a welding fixture, wherein the front side is the aluminum alloy and the return side is the titanium alloy, to prepare a titanium alloy-aluminum alloy composite material; (2) Preparation of polishing liquid Prepare polishing liquid, wherein the concentration of phosphoric acid in the polishing liquid is 2-10g / L, the concentration of sulfuric acid is 0.5-3g / L, Al 3+ The concentration of is 15g / L, the concentration of copper sulfate is 0.1-0.3g / L, the concentration of citric acid is 4-6g / L, and the concentration of bisbenzimidazole corrosion inhibitor is 2-4g / L; (3) Chemically polished titanium alloy-aluminum alloy composite material The titanium alloy-aluminum alloy composite material is first sandblasted, degreased, washed with water, and dried, and then a polishing liquid is added thereto for chemical polishing to obtain a polished titanium alloy-aluminum alloy composite material; (4) Preparation of surface micropores of titanium alloy-aluminum alloy composites A horizontal electrospark machining device was used to machine circular microholes in a titanium alloy-aluminum alloy composite material. The ultrasonic vibration device was fastened to the vertical column of the microhole machine, and the electrode was clamped at the output end of the horn of the ultrasonic vibration device. The electrospark machining electrode was a copper electrode with a diameter of 0.2-0.5 mm. Distilled water was used as the working medium to perform electrospark machining to obtain a titanium alloy-aluminum alloy composite material with surface micropores.

2. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 1, characterized in that: The chemical polishing process in step (3) is as follows: chemical polishing at 70-90° C. for 60-80 seconds, and staying in the air for 15-30 seconds.

3. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 1, wherein: The process of ultrasonic-assisted EDM in step (4) is as follows: the electrode shaking radius is 10-20 μm, the electrode shaking speed is 25-35 μm / s, the ultrasonic vibration frequency is 45-55 kHz, and the ultrasonic amplitude is 2-6 μm.

4. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 1, wherein: The process of the electrospark machining in step (4) is as follows: setting the machining voltage to 80-120V, the current to 5-20A, the capacitance to 8-12nF, the pulse width to 10-30us, and the pressure to 3-5MPa.

5. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 1, wherein: The preparation method of benzimidazole benzoic acid in step (2) is: S1: 3,4-diaminobenzoic acid, benzaldehyde, anhydrous Na2SO4, KI, and N,N-dimethylformamide solvent were added to a round-bottom flask, and microwave reaction was carried out in a microwave reactor. Ethyl acetate and water were then added for extraction. The organic phase was dried to remove water, and the solid crude product was recrystallized from ethanol to obtain benzimidazole benzoic acid; S2: mixing o-phenylenediamine and benzimidazole benzoic acid, adding polyphosphoric acid and concentrated hydrochloric acid, and performing microwave reaction in a microwave reactor. After the reaction, cooling, filtering, washing with acetone, and recrystallizing are performed to obtain a bisbenzimidazole corrosion inhibitor.

6. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 5, characterized in that: In step S1, the mass ratio of 3,4-diaminobenzoic acid, benzaldehyde, Na2SO4, and KI is 1:0.7-1.2:0.1-0.22:0.065-0.

11.

7. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 5, characterized in that: In step S1, the microwave power is 400-600 W, and the microwave reaction time is 20-40 min.

8. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 5, characterized in that: In step S2, the mass ratio of o-phenylenediamine to benzimidazole benzoic acid is 0.6-0.85:

1.

9. The method for forming holes on the surface of a titanium alloy-aluminum alloy composite material according to claim 5, characterized in that: In step S2, the volume ratio of polyphosphoric acid to concentrated hydrochloric acid is 1:1-1.2, and the concentration of concentrated hydrochloric acid is 25-37%.

10. The method for forming pores on the surface of a titanium alloy-aluminum alloy composite material according to claim 5, characterized in that: In step S2, the microwave power is 400-700 W, and the microwave reaction time is 20-60 min.

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