An ultrasonic cleaning process for the surface of an object

Abstract

The present invention belongs to the technical field of ultrasonic cleaning, and particularly relates to an ultrasonic cleaning process for the surface of an object. The ultrasonic cleaning process includes the following steps: (1) spraying the object with hot water to obtain a pre-cleaned object; (2) soaking the pre-cleaned object in a first cleaning agent; (3) soaking the object processed in step (2) in a second cleaning agent; (4) spraying the object processed in step (3) with hot water; (5) soaking the object sprayed in step (4) in a surfactant mixture, and ultrasonically assisting for complete immersion; (6) soaking the object processed in step (5) in a third cleaning agent; (7) putting the object processed in step (6) into an ultrasonic hot water pool for filtration cleaning to obtain a cleaned object. The object obtained by the cleaning process of the present invention has a clean and tidy surface and is green and environmentally friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic cleaning, and in particular relates to an ultrasonic cleaning process for the surface of an object. Background Art

[0002] Ultrasonic cleaning uses the cavitation, acceleration and straight-through flow of ultrasound in liquids to directly and indirectly affect liquids and dirt, so that the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning. The cleaning media used in the ultrasonic cleaning process include chemical solvents and water-based cleaning agents; the chemical action of the cleaning medium can enhance the ultrasonic cleaning effect and can fully and thoroughly clean objects.

[0003] The higher the power density of ultrasound, the stronger the cavitation effect, the faster the speed, and the better the cleaning effect. However, for objects with high precision and high surface finish, long-term high-power density cleaning will cause cavitation and corrosion on the surface of the object. Ultrasonic cleaning is suitable for rough, dirty, and initial cleaning of objects. The higher the frequency, the stronger the directionality of ultrasound, which is suitable for cleaning delicate objects. Generally speaking, the cavitation effect of ultrasound is best at 30℃~40℃, and the cleaning agent is not more effective at higher temperatures, and it may fail at high temperatures.

[0004] A Chinese invention patent with publication number CN 115228837A discloses an ultrasonic cleaning process for metal parts, which includes the following specific steps: S1: placing the metal part to be cleaned in an ultrasonic cleaning device, and injecting a cleaning liquid into the ultrasonic cleaning device so that the cleaning liquid covers the metal part; S2: performing ultrasonic cleaning on the metal part through the ultrasonic cleaning device, and causing the metal part to vibrate during the cleaning process so that the metal part and the cleaning liquid can be fully contacted, thereby improving the cleaning effect of the ultrasonic cleaning device on the metal part; S3: after the metal part is cleaned, taking the metal part out of the ultrasonic cleaning device, and cleaning and drying the water stains remaining on the surface of the metal part.

[0005] A Chinese invention patent with publication number CN 105921459A discloses a method for ultrasonic cleaning of a printed circuit board, which comprises soaking the printed circuit board in chloroform; determining the ultrasonic intensity and selecting the ultrasonic frequency; determining the cleaning temperature; and selecting a cleaning solution and amount, and ultrasonically cleaning the printed circuit board according to the selected intensity, frequency, temperature, cleaning solution and amount.

[0006] The Chinese invention patent with publication number CN 114632764A relates to an ultrasonic cleaning method based on microparticle nucleation and impact effect, which uses the surface of micron particles in the sound field as the location for cavitation nuclei and the impact effect of particles of a certain particle size, and adds mixed micron particles that are insoluble in water, have a certain particle diameter range, and can reach a certain concentration in the cleaning liquid to clean the object to be cleaned. The method includes the following steps: preparing particles of a certain particle size; determining the effective area of ​​particle-assisted cleaning and the particle concentration when the cleaning effect is optimal through preliminary experiments; configuring mixed particles according to a fixed ratio; applying ultrasonic waves to the cleaning liquid after adding the mixed particles to clean the object to be cleaned.

[0007] The Chinese invention patent with publication number CN117066211A relates to a method for ultrasonic cleaning of large-sized quartz lenses, which first places the large-sized quartz lenses that have been pre-polished in a first reagent tank for ultrasonic cleaning, and after cleaning, places the large-sized quartz lenses in a spray tank for a spray cleaning; then places the large-sized quartz lenses in a second reagent tank for ultrasonic cleaning, and after cleaning, places the large-sized quartz lenses in a spray tank for a second spray cleaning; then places the large-sized quartz lenses in a first rinse tank, a second rinse tank, a third rinse tank, and a fourth rinse tank in sequence for ultrasonic cleaning; finally, the large-sized quartz lenses are subjected to a slow pull-up dehydration treatment and drying to complete the ultrasonic cleaning of the large-sized quartz lenses.

[0008] Ultrasonic cleaning technology is widely used in modern industrial cleaning. However, ultrasonic cleaning in different processes and different cleaning media have a great impact on the ultrasonic cleaning process. Therefore, providing an ultrasonic cleaning process that effectively improves the cleaning degree and is suitable for different cleaning objects (especially delicate objects) is a technical problem that still needs to be solved. Summary of the invention

[0009] The purpose of the invention is to provide an ultrasonic cleaning process for the surface of an object.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] An ultrasonic cleaning process for the surface of an object comprises the following steps:

[0012] (1) Spraying the object with hot water to obtain a pre-cleaned object;

[0013] (2) Place the pre-cleaned object in the first cleaning agent and soak it completely at 40-50°C for 3-5 minutes;

[0014] (3) Place the object treated in step (2) into a second cleaning agent at 20-30°C for 1-3 minutes;

[0015] (4) spraying the object treated in step (3) with hot water;

[0016] (5) Soaking the object sprayed in step (4) in a surfactant mixture at 30-40° C. for 3-5 minutes with ultrasonic assistance;

[0017] (6) Place the object treated in step (5) into a third cleaning agent and completely soak it at 20-30°C for 5-10 minutes;

[0018] (7) The object treated in step (6) is placed in an ultrasonic hot water bath at a temperature of 20 to 30° C. for filtering and cleaning for 1 to 5 minutes to obtain a cleaned object.

[0019] Furthermore, the objects include any one of toys, kitchenware, tableware, furniture, textiles, glass, plastic products, and metal products, wherein the metal products are not limited to aluminum alloys (such as 7075 aluminum alloy).

[0020] The present invention can improve the cleaning effect by using the first cleaning agent and the second cleaning agent to clean the object in sequence. When used in the order of the present invention, the first cleaning agent can effectively remove most of the oil stains and impurities without damaging the surface of the object. This preliminary cleaning lays the foundation for the subsequent more stringent subsequent treatment. The second cleaning agent is composed of sodium persulfate, sodium hydroxide and sodium polyacrylate, which further deeply cleans and slightly activates the surface of the object. There is an obvious synergistic effect between the first cleaning agent and the second cleaning agent. They are each designed for different types and levels of pollutants, and only by applying them in a specific order can their respective advantages be maximized while minimizing potential disadvantages. This synergistic effect not only improves the cleaning efficiency, but also protects sensitive substrates from unnecessary damage.

[0021] Furthermore, in step (1), the hot water temperature is 50-60° C., and the spraying conditions are: the spraying pressure is 0.2-0.5 MPa, and the spraying time is 1-2 min.

[0022] Furthermore, in step (4), the hot water temperature is 50-60° C., and the spraying conditions are: the spraying pressure is 0.2-0.5 MPa, and the spraying time is 3-5 min.

[0023] Furthermore, in step (2), the first cleaning agent comprises the following components: 0.5-1 g / L lipase, 10-15 g / L sodium carbonate, 1-2 g / L EDTA-2Na, and the remainder is water.

[0024] Furthermore, the second cleaning agent in step (3) comprises the following components: 3-5 g / L sodium persulfate, 5-8 g / L sodium hydroxide, 0.5-1 g / L sodium polyacrylate, and the remainder is water.

[0025] Furthermore, the surfactant mixture in step (5) comprises the following components: 1.5-2 g / L sodium dodecylbenzene sulfonate, 0.5-1 g / L alkylphenol polyoxyethylene ether, 1-1.5 g / L sodium fatty alcohol ether sulfate, 3-5 mL / L ethanol, and the balance is water.

[0026] The present invention can improve the cleaning effect by using a surfactant of a specific composition. The present invention uses a surfactant mixture of a specific composition to effectively improve the wetting ability of the cleaning liquid on the surface of the object treated by the first cleaning agent and the second cleaning agent. It helps to completely remove dirt and other pollutants, thereby providing a clean and uniform base for subsequent other treatments of the object.

[0027] Furthermore, the third cleaning agent in step (6) comprises the following components: 16-18 (v / v)% nitric acid, 0.1-0.3 g / L thiourea, and the balance is water.

[0028] Furthermore, in step (5), the power of the ultrasonic wave is 100-200 W, and the ultrasonic frequency is 20 kHz-30 kHz.

[0029] Furthermore, in step (7), the power of the ultrasonic wave is 300-400 W, and the ultrasonic frequency is 50 kHz-60 kHz.

[0030] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0031] 1. The present invention can improve the surface cleanliness of cleaned objects (such as 7075 aluminum alloy, glass, plastic products, metal products, toys, kitchen utensils, tableware, furniture, textiles, etc.) by sequentially using the first cleaning agent and the second cleaning agent to clean the aluminum alloy, so that the objects are easy to be processed by other subsequent processes.

[0032] 2. The present invention can improve the adhesion, electroplating or adhesion effect of an object during other treatments (such as coating, electroplating or spraying on the surface of the object) by using a surfactant of a specific composition, thereby enhancing the adhesion strength. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The raw materials used in the following examples of the present invention are all commercially available products:

[0035] Alkylphenol polyoxyethylene ether, OP-10, was purchased from Jiangsu Xinlun Petrochemical Co., Ltd.

[0036] Sodium fatty alcohol ether sulfate, CAS: 9004-82-4, Hubei Tosoh Chemical Technology Co., Ltd.

[0037] Sodium polyacrylate, Shandong Siyang Biotechnology Co., Ltd.

[0038] Sodium α-olefin sulfonate, Hubei Zhongnuoyaxing Biotechnology Co., Ltd.

[0039] The objects to be cleaned in the embodiments and comparative examples are specifically 7075 aluminum alloy, Jiangsu Aluminum Family Aluminum Co., Ltd., 7075 aviation super-hard aluminum plate-aluminum-zinc alloy; the dimensions are: thickness 10 mm×width 500 mm×length 500 mm.

[0040] Example 1

[0041] This embodiment provides an ultrasonic cleaning process for the surface of an object, comprising the following steps:

[0042] (1) Use hot water to spray the object to obtain a pre-cleaned object; the hot water temperature is 55°C, and the spraying conditions are: spraying pressure is 0.3MPa, and time is 1.5min.

[0043] (2) Place the pre-cleaned object in a first cleaning agent and completely soak it at 45°C for 4 minutes; the first cleaning agent includes the following components: 0.7 g / L lipase, 12 g / L sodium carbonate, 1.6 g / L EDTA-2Na, and the balance is water.

[0044] (3) Place the object treated in step (2) into a second cleaning agent at 25° C. and completely soak for 2 min; the second cleaning agent comprises the following components: 4 g / L sodium persulfate, 6 g / L sodium hydroxide, 0.6 g / L sodium polyacrylate, and the balance is water.

[0045] (4) Use hot water to spray the object treated in step (3); the hot water temperature is 55°C, the spraying conditions are: spraying pressure is 0.3MPa, and the time is 4min.

[0046] (5) Soaking the object after spraying in step (4) in a surfactant mixture at 35°C for 4 minutes with the assistance of ultrasound, with an ultrasonic power of 150 W and an ultrasonic frequency of 25 kHz; the surfactant mixture comprises the following components: 1.6 g / L sodium dodecylbenzene sulfonate, 0.8 g / L alkylphenol polyoxyethylene ether, 1.2 g / L sodium fatty alcohol ether sulfate, 4 mL / L ethanol, and the balance is water.

[0047] (6) Place the object treated in step (5) into a third cleaning agent and soak it completely at 25° C. for 7 min; the third cleaning agent comprises the following components: 17 (v / v) % nitric acid, 0.2 g / L thiourea, and the balance water.

[0048] (7) The object treated in step (6) is placed in an ultrasonic hot water bath at a temperature of 25° C. for filtering and cleaning for 2 minutes. The ultrasonic power is 350 W and the ultrasonic frequency is 55 kHz; and a cleaned object is obtained.

[0049] Example 2

[0050] This embodiment provides an ultrasonic cleaning process for the surface of an object, comprising the following steps:

[0051] (1) Use hot water to spray the object to obtain a pre-cleaned object; the hot water temperature is 50°C, the spraying conditions are: the spraying pressure is 0.2MPa, and the time is 1min.

[0052] (2) Place the pre-cleaned object in the first cleaning agent and completely soak it at 40°C for 3 minutes; the first cleaning agent includes the following components: 0.5 g / L lipase, 10 g / L sodium carbonate, 1 g / L EDTA-2Na, and the balance is water.

[0053] (3) Place the object treated in step (2) into a second cleaning agent at 20° C. and soak completely for 1 min; the second cleaning agent comprises the following components: 3 g / L sodium persulfate, 5 g / L sodium hydroxide, 0.5 g / L sodium polyacrylate, and the balance is water.

[0054] (4) Use hot water to spray the object treated in step (3); the hot water temperature is 50°C, the spraying conditions are: spraying pressure is 0.2MPa, and the time is 3min.

[0055] (5) Soak the object after spraying in step (4) in a surfactant mixture at 30°C for 3 min with the assistance of ultrasound, with an ultrasonic power of 100 W and an ultrasonic frequency of 20 kHz; the surfactant mixture comprises the following components: 1.5 g / L sodium dodecylbenzene sulfonate, 0.5 g / L alkylphenol polyoxyethylene ether, 1 g / L sodium fatty alcohol ether sulfate, 3 mL / L ethanol, and the balance is water.

[0056] (6) Place the object treated in step (5) into a third cleaning agent and soak it completely at 20° C. for 5 min; the third cleaning agent comprises the following components: 16 (v / v) % nitric acid, 0.1 g / L thiourea, and the balance water.

[0057] (7) The object treated in step (6) is placed in an ultrasonic hot water bath at a temperature of 20° C. for filtering and cleaning for 1 min. The ultrasonic power is 300 W and the ultrasonic frequency is 50 kHz. The cleaned object is obtained.

[0058] Example 3

[0059] This embodiment provides an ultrasonic cleaning process for the surface of an object, comprising the following steps:

[0060] (1) Use hot water to spray the object to obtain a pre-cleaned object; the hot water temperature is 60°C, the spraying conditions are: the spraying pressure is 0.5MPa, and the time is 2min.

[0061] (2) Place the pre-cleaned object in the first cleaning agent and completely soak it at 50°C for 5 minutes; the first cleaning agent includes the following components: 1g / L lipase, 15g / L sodium carbonate, 2g / L EDTA-2Na, and the balance is water.

[0062] (3) Place the object treated in step (2) into a second cleaning agent at 30° C. and completely soak for 3 min; the second cleaning agent comprises the following components: 5 g / L sodium persulfate, 8 g / L sodium hydroxide, 1 g / L sodium polyacrylate, and the balance is water.

[0063] (4) Use hot water to spray the object treated in step (3); the hot water temperature is 60°C, the spraying conditions are: spraying pressure is 0.5 MPa, and the time is 5 minutes.

[0064] (5) Soaking the object after spraying in step (4) in a surfactant mixture at 40°C for 5 min with the assistance of ultrasound, with an ultrasonic power of 200 W and an ultrasonic frequency of 30 kHz; the surfactant mixture comprises the following components: 2 g / L sodium dodecylbenzene sulfonate, 1 g / L alkylphenol polyoxyethylene ether, 1.5 g / L sodium fatty alcohol ether sulfate, 5 mL / L ethanol, and the balance is water.

[0065] (6) Place the object treated in step (5) into a third cleaning agent and completely soak it at 30° C. for 10 min; the third cleaning agent comprises the following components: 18 (v / v) % nitric acid, 0.3 g / L thiourea, and the balance water.

[0066] (7) The object treated in step (6) is placed in an ultrasonic hot water bath at a temperature of 30° C. for filtering and cleaning for 5 minutes. The ultrasonic power is 400 W and the ultrasonic frequency is 60 kHz. The cleaned object is obtained.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 1 is that the cleaning order of step (2) and step (3) is different.

[0069] An ultrasonic cleaning process for the surface of an object comprises the following steps:

[0070] (1) Use hot water to spray the object to obtain a pre-cleaned object; the hot water temperature is 55°C, and the spraying conditions are: spraying pressure is 0.3MPa, and time is 1.5min.

[0071] (2) Place the pre-cleaned object in a second cleaning agent at 25°C and soak it completely for 2 minutes; the second cleaning agent includes the following components: 4 g / L sodium persulfate, 6 g / L sodium hydroxide, 0.6 g / L sodium polyacrylate, and the balance is water.

[0072] (3) Place the object treated in step (2) into a first cleaning agent and completely soak it at 45°C for 4 minutes; the first cleaning agent comprises the following components: 0.7 g / L lipase, 12 g / L sodium carbonate, 1.6 g / L EDTA-2Na, and the balance is water.

[0073] (4) Use hot water to spray the object treated in step (3); the hot water temperature is 55°C, the spraying conditions are: spraying pressure is 0.3MPa, and the time is 4min.

[0074] (5) Soaking the object after spraying in step (4) in a surfactant mixture at 35°C for 4 minutes with the assistance of ultrasound, with an ultrasonic power of 150 W and an ultrasonic frequency of 25 kHz; the surfactant mixture comprises the following components: 1.4 g / L sodium dodecylbenzene sulfonate, 0.8 g / L alkylphenol polyoxyethylene ether, 1.2 g / L sodium fatty alcohol ether sulfate, 4 mL / L ethanol, and the balance is water.

[0075] (6) Place the object treated in step (5) into a third cleaning agent and soak it completely at 25° C. for 7 min; the third cleaning agent comprises the following components: 17 (v / v) % nitric acid, 0.2 g / L thiourea, and the balance water.

[0076] (7) The object treated in step (6) is placed in an ultrasonic hot water bath at a temperature of 25° C. for filtering and cleaning for 2 minutes. The ultrasonic power is 350 W and the ultrasonic frequency is 55 kHz; and a cleaned object is obtained.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that the surfactant mixture includes the following components: 1.4 g / L sodium α-olefin sulfonate, 0.8 g / L cocamidopropyl betaine, 1.2 g / L hexadecyltrimethylammonium bromide, 4 mL / L ethanol, and the balance is water.

[0079] Comparative Example 3

[0080] The difference between this comparative example and Example 1 is that the surfactant mixture includes the following components: 0.3 g / L sodium dodecylbenzene sulfonate, 1.5 g / L alkylphenol polyoxyethylene ether, 1.8 g / L sodium fatty alcohol ether sulfate, 4 mL / L ethanol, and the balance is water.

[0081] Comparative Example 4

[0082] This comparative example uses a common method in the prior art for cleaning, which is as follows:

[0083] An ultrasonic cleaning process for the surface of an object comprises the following steps:

[0084] (1) Use hot water to spray the object to obtain a pre-cleaned object; the hot water temperature is 55°C, and the spraying conditions are: spraying pressure is 0.3MPa, and time is 1.5min.

[0085] (2) 3g / LNaOH, 30g / LNa 2 CO 3 , 30g / LNa 3 PO 4 Heat the prepared alkali solution to 80℃, react for 5 minutes, then rinse with 70℃ hot water for 2 minutes, and then rinse with deionized water for 2 minutes. Put it in a beaker filled with acetone and shake it under ultrasonic for 10 minutes;

[0086] (3) Place the object treated in step (2) into a third cleaning agent and completely soak it at 25°C for 7 minutes; the third cleaning agent comprises the following components: 17 (v / v)% nitric acid, 0.2 g / L thiourea, and the balance water.

[0087] (4) The object treated in step (3) is placed in an ultrasonic hot water bath at a temperature of 25° C. for filtering and cleaning for 2 minutes. The ultrasonic power is 350 W and the ultrasonic frequency is 55 kHz; and a cleaned object is obtained.

[0088] Comparative Example 5

[0089] This comparative example uses the cleaning method of Example 1 in Chinese Patent 201510951674.4 for cleaning.

[0090] Performance Testing

[0091] The ultrasonic cleaning processes of Examples 1-3 and Comparative Examples 1-5 were used for cleaning, and electroplating was performed after cleaning. The electroplating method is as follows: the composite electroplating solution includes the following components in weight percentage: 71.5% nickel sulfate, 3.7% nickel chloride, 8.8% boric acid, 15% silicon carbide and 0.1% hexadecyltrimethylammonium bromide, and the balance is water; the aluminum alloy is placed in the prepared composite electroplating solution for electroplating; the process conditions for the electroplating treatment are: the current density is 5A / dm 2 , pH value is 4, temperature is 60℃, and electroplating time is 30min; after electroplating, rinse in deionized water, clean under ultrasonic vibration for 10min, and then dry, and perform the following tests;

[0092] (1) The appearance of the electroplated aluminum alloy was observed by visual inspection and SEM electron microscope.

[0093] (2) Adhesion test

[0094] Use a grid cutter to cut and penetrate the coating into a grid pattern, and use a soft brush to gently brush the test piece 5 times backward and 5 times forward along the two diagonals of the grid pattern; finally, use a 25mm wide translucent tape to stick on the entire grid, tear it off at the minimum angle, count the area of ​​the detached coating under a magnifying glass, and calculate the percentage of the detached coating to the total coating area = the detached coating to the coating area ÷ the total coating area × 100%, and perform 3 parallel repeated tests for each sample.

[0095] The results are shown in Table 1 below.

[0096] Table 1: Performance test results

[0097] Coating appearance Microstructure Adhesion % Example 1 The coating color and thickness are uniform, smooth and dense Grain size and shape are uniform and dense No shedding Example 2 The coating color and thickness are uniform, smooth and dense Grain size and shape are uniform and dense No shedding Example 3 The coating color and thickness are uniform, smooth and dense Grain size and shape are uniform and dense No shedding Comparative Example 1 The coating is rough, uneven, and the overall coating is dark Grain size and shape are relatively uneven 2.7 Comparative Example 2 The color and thickness of the coating are relatively uniform Grain size and shape are relatively uneven 1.6 Comparative Example 3 The color and thickness of the coating are relatively uniform Grain size and shape are relatively uneven 1.2 Comparative Example 4 The coating is rough, uneven, and the overall coating is dark The grain size and shape are very uneven 4.1 Comparative Example 5 The coating is rough, uneven, and the overall coating is dark The grain size and shape are very uneven 5.3

[0098] It can be seen from the above performance test results that the ultrasonic cleaning process of Examples 1 to 3 has excellent cleaning effect, and the electroplating effect on the surface of the object after cleaning is good, and the coating adhesion is strong.

[0099] The order of using the first cleaning agent and the second cleaning agent in Comparative Example 1 is different from that in Example 1, and the electroplating adhesion effect is reduced, indicating that the first cleaning agent and the second cleaning agent used in the present invention have a synergistic effect. When used in a certain order, they can not only help to remove dirt on the surface of the object, but also minimize corrosion on the surface of the object. After reversing the order, the second cleaning agent may change the surface properties from the beginning, such as increasing the surface roughness or introducing additional chemical residues, thereby hindering the effective work of the first cleaning agent. Improper treatment of the surface of the object (especially aluminum alloy) will affect the adhesion of the new coating.

[0100] The composition and concentration of the surfactants used in Comparative Examples 2 and 3 are different, and the effect of electroplating is reduced. Analysis shows that hydrogen is easily generated during electroplating on the surface of an object. These bubbles may adhere to the surface of the object and hinder the deposition of metal ions, thereby causing pinholes or other defects in the coating. The appropriate surfactant used in Example 1 of the present invention can better reduce the surface tension of the solution to cause the bubbles that may have been formed in the previous step to quickly detach from the surface of the object, thereby ensuring the continuity and integrity of the coating.

[0101] Comparative Example 4 uses the prior art method for cleaning, but the electroplating adhesion effect is poor.

[0102] The effect of using the disclosed patent technology on 7075 aluminum alloy in Comparative Example 5 is also unsatisfactory, indicating that the method of the patent is not suitable for cleaning 7075 aluminum alloy, further verifying that 7075 aluminum alloy has high specific requirements for the cleaning process.

[0103] The above experimental results further prove the importance of the technical solution defined in the present invention to its technical effect.

[0104] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A 7075 aluminum alloy surface ultrasonic cleaning process, characterized in that: The process steps are: (1) Spraying the object with hot water to obtain a pre-cleaned object; (2) placing the pre-cleaned object in a first cleaning agent and completely soaking it at 40-50°C for 3-5 minutes; the first cleaning agent comprises the following components: 0.5-1 g / L lipase, 10-15 g / L sodium carbonate, 1-2 g / L EDTA-2Na, and the balance is water; (3) placing the object treated in step (2) into a second cleaning agent at 20-30° C. for complete immersion for 1-3 min; the second cleaning agent comprises the following components: 3-5 g / L sodium persulfate, 5-8 g / L sodium hydroxide, 0.5-1 g / L sodium polyacrylate, and the balance is water; (4) spraying the object treated in step (3) with hot water; (5) Soaking the object sprayed in step (4) in a surfactant mixture at 30-40° C. for 3-5 minutes with ultrasonic assistance; (6) placing the object treated in step (5) into a third cleaning agent and completely soaking it at 20-30° C. for 5-10 min; the third cleaning agent comprises the following components: 16-18 (v / v)% nitric acid, 0.1-0.3 g / L thiourea, and the balance water; (7) placing the object treated in step (6) into an ultrasonic hot water bath at a temperature of 20 to 30° C. for filtering and cleaning for 1 to 5 minutes to obtain a cleaned object; The surfactant mixture in step (5) comprises the following components: 1.5-2 g / L sodium dodecylbenzene sulfonate, 0.5-1 g / L alkylphenol polyoxyethylene ether, 1-1.5 g / L sodium fatty alcohol ether sulfate, 3-5 mL / L ethanol, and the balance is water.

2. The ultrasonic cleaning process for the surface of 7075 aluminum alloy object according to claim 1 is characterized in that: The third cleaning agent in step (6) comprises the following components: 17 (v / v) % nitric acid, 0.3 g / L thiourea, and the balance water.

3. The ultrasonic cleaning process for the surface of 7075 aluminum alloy object according to claim 1 is characterized in that: In step (5), the power of the ultrasonic wave is 100-200 W, and the ultrasonic frequency is 20 kHz-30 kHz.

4. The ultrasonic cleaning process for the surface of 7075 aluminum alloy object according to claim 1 is characterized in that: In step (7), the power of the ultrasonic wave is 300-400 W, and the ultrasonic frequency is 50 kHz-60 kHz.

5. The ultrasonic cleaning process for the surface of 7075 aluminum alloy object according to claim 1, characterized in that: In step (1), the hot water temperature is 50-60° C., and the spraying conditions are: the spraying pressure is 0.2-0.5 MPa, and the spraying time is 1-2 min.

6. The ultrasonic cleaning process for the surface of 7075 aluminum alloy object according to claim 1, characterized in that: In step (4), the hot water temperature is 50-60° C., and the spraying conditions are: the spraying pressure is 0.2-0.5 MPa, and the spraying time is 3-5 min.