Cleaning and drying process for magnetic steel nickel plating layer

Abstract

The application relates to the technical field of permanent magnet materials, and discloses a magnetic steel nickel plating layer cleaning and drying process, which comprises the following steps: S1, ultrasonic cleaning: taking ultrapure water as a medium, and placing the magnetic steel material plated with a nickel plating layer into an ultrasonic cleaning machine to perform cleaning; S2, bubble cleaning: taking ultrapure water as a medium, and placing the magnetic steel material cleaned in step S1 into a bubble cleaning machine to perform cleaning; S3, heating cleaning: taking a plating self-repairing type cleaning solution as a medium, and placing the magnetic steel material cleaned in step S2 into a heating cleaning tank to perform heating cleaning; S4, dehydration: placing the magnetic steel material cleaned in step S3 into a dehydrator to perform dehydration; and S5, drying: placing the magnetic steel material dehydrated in step S4 into a drying box to perform heating drying, wherein the active components of the plating self-repairing type cleaning solution comprise perfluoropolyether, nanometer silane and CeO2 nanoparticles, and the solvent is ultrapure water. The process can be operated in batches, has a short time consumption, and is high in safety.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of permanent magnet materials, in particular to a magnetic steel nickel plating layer cleaning and drying process. BACKGROUND

[0002] Since the development in 1983, the Nd-Fe-B material as the third generation of rare earth permanent magnet material has been widely applied to the fields of information technology, high-end numerical control machine tools, robots, new energy vehicles, high-end medical devices, urban rail transit and energy-saving home appliances due to the characteristics of one-time forming, high magnetic energy product, excellent dynamic recovery characteristics and high cost performance.

[0003] The ultra-thin Nd-Fe-B magnetic steel generally refers to a product with a thickness of less than 0.4 mm, and the ultra-thin Nd-Fe-B magnetic steel is mainly used for wireless charging of mobile phones and has a large daily delivery demand and high appearance requirements. After electroplating of the Nd-Fe-B magnetic steel, the product needs to go through multiple water washing, however, in the electroplating cleaning process, the product is prone to lamination due to the ultra-thin thickness, water stains are generated and the yield is affected. Moreover, the surface tension of the product after electroplating will rapidly decrease due to the inspection environment problem in the inspection process, leading to the fact that the delivery cannot meet the standard. After the electroplating cleaning is reworked to improve the fact, the magnetic steel must be re-inspected due to the poor environment of the electroplating factory, but the fact will decrease again in the inspection process, entering a dead loop, which seriously affects the delivery efficiency and the effect cannot be guaranteed.

[0004] In the prior art, to solve the problem of product dirt after electroplating cleaning, the solution is to use alcohol immersion cleaning for the nickel plating layer. For example, the cleaning process for electroplated nickel ultra-thin magnetic steel disclosed in the granted patent CN114318479B comprises the following steps: S1. ethanol immersion: the magnetic steel is immersed in an ethanol solution for immersion treatment; S2. cleaning: the immersed magnetic steel is cleaned with clean water; S3. centrifugal dewatering: the cleaned magnetic steel is dewatered by a centrifugal machine; S4. ethanol dewatering: the centrifugally dewatered magnetic steel is immersed in an ethanol solution again for immersion treatment; and S5. drying: the magnetic steel is dried by hot air. The process can achieve the purposes of removing dirt, water stains and improving the fact.

[0005] However, the process uses twice alcohol immersion, the product is placed on a dust-free cloth, the product and the cloth are immersed in an alcohol barrel, the dust-free cloth is manually pulled to clean the product, and the product is dried by a fan after being taken out. The above scheme has the following problems: 1. due to the limited use of alcohol, only a small amount of products can be cleaned each time, and batch operation is not possible; if the product is dirty, it needs to be returned to the electroplating factory for cleaning, which not only takes a long time, but also affects the production progress; 2. manual cleaning is not thorough enough, and only slightly dirty products can be cleaned; 3. there are safety hazards in alcohol and blowing operation. SUMMARY

[0006] The technical problem solved by the present application is that alcohol is used in the existing magnetic steel nickel plating layer cleaning and drying process, which cannot be batched, takes a long time, and has safety hazards.

[0007] The technical solution of the present application is: a magnetic steel nickel plating layer cleaning and drying process, comprising the following steps:

[0008] S1, ultrasonic cleaning: using ultrapure water as a medium, the magnetic steel material plated with a nickel plating layer is placed in an ultrasonic cleaning machine for cleaning;

[0009] S2, bubble cleaning: using ultrapure water as a medium, the magnetic steel material cleaned in step S1 is placed in a bubble cleaning machine for cleaning;

[0010] S3, heating cleaning: using a plating self-repairing cleaning solution as a medium, the magnetic steel material cleaned in step S2 is placed in a heating cleaning tank for cleaning;

[0011] S4, dehydration: the magnetic steel material cleaned in step S3 is loaded into a dehydrator for dehydration;

[0012] S5, drying: the magnetic steel material dehydrated in step S4 is placed in a drying oven for heating and drying,

[0013] The active ingredients of the plating self-repairing cleaning solution include perfluoropolyether, nanosilane and CeO2 nanoparticles, and the solvent is ultrapure water.

[0014] In the above scheme, ultrapure water medium is used, ultrasonic cleaning and bubble cleaning are used cooperatively to reduce the adhesion of pollutants on the surface of the magnetic steel material to its substrate, and heating treatment is used to facilitate the complete shedding of pollutants; then the material is transferred to a dehydrator to quickly remove free water, and is directly subjected to heat drying to ensure rapid drying of the surface without water stains. This pretreatment process is efficient, safe and can be continuously batched. After the basic cleaning is completed, the material is placed in a plating self-repairing cleaning solution for heating treatment, so that the cleaning solution is left on the surface in a controlled manner; in the subsequent drying stage, the residual liquid undergoes a silane condensation reaction to generate a SiO2-CeO2 composite film in situ at the nickel plating layer defects, and the rare earth elements in the magnetic steel substrate adsorb the oxygen elements in the composite film to form trace rare earth oxides, which together seal the plating layer pinholes and enhance the density thereof, thereby effectively reducing pinhole corrosion and ultimately reducing the loss of magnetic flux of the magnetic steel caused by corrosion.

[0015] In a possible implementation, the volume concentration of the perfluoropolyether in the plating self-repairing cleaning solution is 3-5 vol%, the mass concentration of the nanometer silane is 0.5-1.5 wt%, and the mass concentration of the CeO2 nanoparticles is 30-100 ppm.

[0016] In a possible implementation, the plating self-repairing cleaning solution is prepared by directly adding the perfluoropolyether, the nanometer silane, and the CeO2 nanoparticles into the ultrapure water and uniformly ultrasonically dispersing.

[0017] In the above scheme, the perfluoropolyether and the ultrapure water can form an emulsion base liquid, which can well dissolve the nanometer silane and the CeO2 nanoparticles.

[0018] In a possible implementation, the ultrasonic cleaning in step S1 is performed at a temperature of 40-60℃ for 2-10 min.

[0019] In a possible implementation, the bubbling cleaning in step S2 is performed at a temperature of 40-60℃ for 2-5 min.

[0020] In a possible implementation, the heating in step S3 is performed at a temperature of 75-80℃ for 2-5 min.

[0021] In the above scheme, the ultrasonic cleaning is performed at a temperature of 40-60℃ for 2-10 min to achieve a better cleaning effect without damaging the magnetic steel material. If the temperature is too high, the ultrasonic vibration can easily damage the surface of the material. If the temperature is too low, the ultrasonic vibration cannot effectively reduce the adhesion of the dirt. Therefore, the appropriate cleaning temperature range and the ultrasonic action time are key process parameters.

[0022] The bubbling cleaning is performed at a temperature of 40-60℃ for 2-5 min, which is a result of comprehensive consideration of the cleaning degree and the damage to the magnetic steel material. The bubbling cleaning is milder than the ultrasonic cleaning, which can reduce the adhesion of the dirt without damaging the nickel plating layer. After the adhesion of the dirt on the surface of the nickel plating layer is reduced by the ultrasonic vibration, the bubbling cleaning is used to further reduce the adhesion of the dirt, which facilitates the subsequent heating cleaning to remove the dirt.

[0023] The heating temperature of 75-80℃ and the heating time of 2-5 min are crucial for the cleaning process of the magnetic steel material. If the heating temperature is too high, the internal temperature of the magnetic steel material can be too high in the subsequent drying process, which can affect the product performance and cause water stains. If the heating temperature is too low, the internal temperature of the magnetic steel material can be too low in the subsequent drying process, which can not be easily dried and can also cause water stains. This process parameter is a better result obtained through practice and experiments.

[0024] In a possible implementation, in step S1, when the maximum single side size of the magnetic steel material is ≤5.0 mm, the ultrasonic cleaning time is 2-5 min; when the maximum single side size of the magnetic steel material is >5.0 mm, the ultrasonic cleaning time is 4-10 min.

[0025] In the above scheme, for the magnetic steel material plated with a nickel plating layer on a neodymium iron boron or other substrate, the operation rule of ultrasonic cleaning can be obtained after multiple test experiences, that is, the ultrasonic time is longer for large-size products and shorter for small-size products at a temperature of 40-60 ℃, so as to reduce the time consumption on the basis of meeting the cleaning effect of ultrasonic.

[0026] In a possible implementation, the dehydration in step S4 is specifically as follows: the magnetic steel material cleaned in step S3 is loaded into a storage bag, the bag opening is tightened so that the magnetic steel material has no extra moving space, the storage bag loaded with the magnetic steel material is placed into a dehydration barrel of a dehydration machine, a dust-free cloth is inserted into the gap between the storage bag and the dehydration barrel, and then dehydration is performed.

[0027] In a possible implementation, the storage bag in step S4 is a cotton gauze bag, a polyester mesh cloth bag or a mesh nylon cloth bag.

[0028] In a possible implementation, the dehydration frequency in step S4 is 30-50 Hz, and the time is 1-3 min.

[0029] In the above scheme, the cotton gauze bag, the polyester mesh cloth bag or the mesh nylon cloth bag is used to store the magnetic steel material. The cloth bag made of the above materials has the characteristics of softness, good water absorption and easy tightening and sealing, the wrinkles of the cloth can effectively limit the moving space of the magnetic steel material, so that the material can effectively remove water during the operation of the dehydration machine, and the nickel plating layer is prevented from being damaged due to violent collision or rotation. On this basis, the present application combines the storage bag and the above dehydration frequency and dehydration time, so that the magnetic steel material is prevented from being scattered and collided during dehydration, the magnetic steel material is prevented from being excessively vibrated and collided in the dehydration barrel, and the weak magnetism is prevented from being generated. The inventor has shown through multiple tests that no weak magnetism is generated within 30-50 Hz and 1-3 min.

[0030] In a possible implementation, step S5 is specifically as follows: the dehydrated magnetic steel material is laid flat in a drying box, the temperature of the drying box is controlled at 50-70 ℃, and the drying time is 10-20 min.

[0031] In the above scheme, the drying temperature is controlled at 50-70 DEG C, and the drying time is 10-20 min, which is an important parameter requirement for fast drying without water stains. If the drying temperature is too high, the product performance of the magnetic steel material will be affected and there will be water stains. If the drying temperature is too low, the drying is slow, the efficiency is low, and there are easy water stains. At the same time, the drying of the magnetic steel material prevents the water stains of the magnetic steel material from being stacked, and on this basis, the drying box is used instead of the fan or the hair dryer, and the safety of the closed drying mode is higher.

[0032] In one possible implementation, in step S5, when the length x width of the magnetic steel material is <18mm 2 , the drying time is 10-15 min; when the length x width of the magnetic steel material is >=18mm 2 , the drying time is 15-20 min.

[0033] The current ultra-thin neodymium-iron-boron magnetic steel material size is mostly divided by 18mm 2 , and for the commonly used magnetic steel material size in the prior art, the present application gives different drying times, which can be applied to different magnetic steel sizes.

[0034] The present application has the following beneficial effects compared with the prior art:

[0035] 1. The cleaning process of the magnetic steel material is systematically optimized: the traditional manual cleaning is upgraded to ultrasonic cleaning, which significantly improves the cleaning efficiency; the super pure water is used instead of alcohol as the cleaning medium, which eliminates the safety hazards of organic solvents and meets the green environmental protection requirements; and the drying box is used instead of the hair dryer, which further improves the process safety.

[0036] 2. The cleaning process of the present application realizes efficient cleaning through multiple synergistic effects: the ultrasonic cleaning utilizes the cavitation effect to destroy the adsorption of dirt and the magnetic steel surface; the bubbling cleaning prevents the re-deposition of pollutants through fluid disturbance; the heating cleaning removes the surface dirt while improving the internal temperature of the magnetic steel through heat conduction, thereby accelerating the evaporation of water in the subsequent drying process.

[0037] 3. The cleaning process of the present application innovatively uses a composite coating self-repairing cleaning liquid, which is composed of perfluoropolyether, nanometer silane, CeO2 nanoparticles and super pure water. The cleaning liquid can form a residual liquid containing active ingredients on the surface of the nickel plating layer of the magnetic steel material during the cleaning process, and a phase change occurs during the drying stage: the perfluoropolyether promotes the rapid evaporation of the super pure water, while the nanometer silane and the CeO2 nanoparticles form a SiO2-CeO2 composite ceramic film in situ. At the same time, the rare earth elements in the magnetic steel substrate will selectively adsorb the oxygen elements in the composite film to generate trace rare earth oxides, thereby effectively sealing the pinhole defects in the nickel plating layer, improving the plating layer density, inhibiting the pinhole corrosion phenomenon, and ultimately reducing the magnetic flux loss of the magnetic steel material.

[0038] 4. In the dehydration link, the application adopts special tightening gauze cloth bags for physical dehydration, which has dual advantages: it can ensure that there is no obvious water stain residue on the surface of the magnetic steel, and it can also avoid the risk of mechanical damage or fracture of the plating layer caused by traditional dehydration methods.

[0039] 5. The drying process of the application adopts an intelligent control strategy, dynamically adjusts the drying time according to the surface area of the magnetic steel material, significantly shortens the operation time under the premise of ensuring the dehydration effect, and improves the overall production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 SEM picture of the cross section of the cleaned magnetic steel material of Example 1;

[0041] Figure 2 SEM picture of the cross section of the cleaned magnetic steel material of Example 1; Figure 1 SEM picture of the cross section of the cleaned magnetic steel material of Example 1;

[0042] Figure 3 XRD picture of the magnetic steel material of Example 1;

[0043] Figure 4 Surface water stain morphology diagram of the magnetic steel material obtained by Comparative Example 1. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below. It should be noted that the following embodiments are only used to illustrate the implementation method and typical parameters of the application, and are not used to limit the parameter range described in the application, and any reasonable changes derived therefrom are still within the protection scope of the claims of the application.

[0045] It should be noted that the endpoints of the ranges and any values disclosed herein are not limited to the exact values recited, as the ranges or values should be understood to include values approximating these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0046] Unless otherwise defined, all terms, symbols and other scientific terminology used herein are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In some instances, terms are defined herein for the sake of clarity and convenience only and not in a manner intended to limit the scope of the application. The technical methods described or referenced herein are generally well known to those skilled in the art and are performed by routine methods unless otherwise stated. Unless otherwise stated, the use of commercially available kits and reagents, and the use of instruments are performed according to the protocols and parameters given by the manufacturer.

[0047] The present application provides a magnetic steel nickel plating layer cleaning and drying process, comprising the following steps:

[0048] S1, ultrasonic cleaning: with ultrapure water as the ultrasonic medium, the magnetic steel material plated with a nickel plating layer is placed in an ultrasonic cleaning machine for cleaning. The specific operation is as follows: first, turn on the ultrasonic cleaning machine and the ultrapure water machine total switch, press the power button, turn on the heating button, wait for the water temperature to heat to the predetermined temperature of 40-60℃, then put the magnetic steel material into the slot of the ultrasonic cleaning machine for cleaning. The ultrasonic cleaning machine and the ultrapure water machine do not need to be customized, and the machines purchased on the market can be used, such as the automatic ultrasonic cleaning machine of the Jimei brand. The ultrasonic cleaning temperature can be 40℃, 45℃, 50℃, 55℃, or 60℃. The time also does not need to be too long, and can be controlled within 2-10 min. Generally, when the physical maximum single side size of the magnetic steel material is ≤5.0 mm, the ultrasonic cleaning time is 2-5 min; when the physical maximum single side size of the magnetic steel material is >5.0 mm, the ultrasonic cleaning time is 4-10 min. Of course, multiple ultrasonic cleaning machines can also be used to adjust the temperature and time parameters, so that the magnetic steel material can be sequentially cleaned by multiple ultrasonic cleaning machines to ensure sufficient ultrasonic degreasing requirements.

[0049] S2, bubble cleaning: the magnet material cleaned in step S1 is placed in a bubble cleaning machine with ultrapure water as the bubble medium. In the whole cleaning process, the magnet material can be placed in a mesh basket for easy control, and the mesh basket is lifted to place the magnet material in different cleaning tanks for cleaning. The cleaning intensity can also be increased by lifting the mesh basket up and down. Specifically, the temperature of the bubble cleaning machine is set to 40-60°C, the mesh basket taken out of the ultrasonic cleaning machine is placed in the cleaning tank of the bubble cleaning machine, and the placement time is 2-5 min. Similarly, this step can also be refined to short-time multiple bubble cleaning operations, that is, multiple bubble cleaning machines are set according to the needs, the temperature and time are uniformly set, and the magnet material cleaned by ultrasonic cleaning is placed in multiple bubble cleaning machines in turn for cleaning. In this way, the parameters of the bubble cleaning machine do not need to be adjusted frequently to batch clean different magnet materials, which is suitable for batch operation. The bubble cleaning machine used here can be a commercially available bubble cleaning machine, such as a Tianjin Zhongchen bubble cleaning machine.

[0050] S3, heating cleaning: the magnet material cleaned in step S2 is placed in a heating cleaning machine with a plating layer self-repairing cleaning solution as the cleaning medium. The active ingredients of the plating layer self-repairing cleaning solution include perfluoropolyether, nanosilane and CeO2 nanoparticles, and the solvent is ultrapure water. Preferably, the volume concentration of perfluoropolyether in the plating layer self-repairing cleaning solution is 3-5 vol%, the mass concentration of nanosilane is 0.5-1.5 wt%, and the mass concentration of CeO2 nanoparticles is 30-100 ppm. The magnet material cleaned in step S2 is placed in a heating cleaning machine, the plating layer self-repairing cleaning solution is poured in, and the cleaning is directly heated. The heating cleaning machine used here can be a commercially available water tank machine with heating function, or multiple water tanks can be set in the heating cleaning machine for multiple cleaning. The heating temperature of the heating cleaning machine is 75-80°C, and the cleaning time is 2-5 min.

[0051] S4, dehydration: the magnet material cleaned in step S3 is placed in a dehydration bag and dehydrated in a dehydration machine. The specific steps are as follows: the magnet material cleaned in step S3 is placed in a dehydration bag, the bag opening is tightened to make the magnet material have no extra space, the surrounding of the dehydration barrel of the dehydration machine is stuffed with dust-free cloth, and then the dehydration machine is started, the frequency of the dehydration machine is set to 30-50 Hz, and the time is 1-3 min. The dehydration machine used here is preferably a small centrifugal dehydration machine. The dehydration bag is a cotton gauze bag, a polyester mesh bag or a mesh nylon bag.

[0052] S5, drying: after the dehydrated magnetic steel material in step S4 is laid flat and placed in a drying oven, heating and drying can be performed. The specific steps are as follows: after the temperature of the oven reaches the preset temperature, the dehydrated magnetic steel material in step S4 is poured into a baking tray, laid flat, and quickly moved into the drying oven for heating and drying until the surface is dry without water stains. The temperature of the drying oven is controlled at 50-70℃, and the drying time is 10-20min. When the length x width of the magnetic steel material is <18mm 2 , the drying time is 10-15min; when the length x width of the magnetic steel material is ≥18mm 2 , the drying time is 15-20min.

[0053] S6, inspection: the dried magnetic steel material is placed under light for visual inspection of water stains. If there are water stains, return to steps S1-S5.

[0054] The magnetic steel nickel plating cleaning and drying process of the application can well remove dirt from the surface of the magnetic steel material through the triple cleaning process of ultrasonic cleaning, bubbling cleaning and heating cleaning, and through suitable temperature and time control. The dehydrating process is added after cleaning and before drying to timely remove the dirty medium water. Then, through the temperature and time control of the drying oven, the water stains are quickly removed to ensure the cleanliness of the nickel plating. This process does not use alcohol and does not use a hair dryer or fan, which is safe to operate. It can be applied to all magnetic steel materials with nickel plating and can be operated in batches with short time consumption.

[0055] The application will be further described in detail below in combination with the drawings and specific examples.

[0056] Example 1

[0057] The nickel plating of the neodymium iron boron magnetic steel material is cleaned and dried. The physical maximum single side size value of the neodymium iron boron magnetic steel material is 4.5mm, and the length x width is 4.5mm x 2.85mm.

[0058] S1, ultrasonic cleaning: the whole package of neodymium iron boron magnetic steel material is placed in a mesh basket in the water tank one of the ultrasonic cleaning machine with ultrapure water as the medium, the temperature is controlled at 50℃, and the cleaning time is 3min; then the mesh basket is lifted and placed in the water tank two of the ultrasonic cleaning machine, the temperature is controlled at 50℃, and the cleaning time is 3min.

[0059] S2, bubbling cleaning: three cleaning tanks are arranged in the bubbling cleaning machine in sequence, namely water tank three, water tank four and water tank five, ultrapure water is added as the cleaning medium in each tank, the temperature is set at 50℃, the mesh basket cleaned in step S1 is lifted and cleaned in water tank three, water tank four and water tank five for 3min each.

[0060] S3. Heating Cleaning: Set up a water tank six in the heating cleaning machine and set the temperature to 80℃. The cleaning medium in water tank six is ​​a coating self-repairing cleaning solution. Its composition is perfluoropolyether with a volume concentration of 3 vol%, nano-silane with a mass concentration of 0.5 wt%, CeO2 nanoparticles with a mass concentration of 30 ppm, and ultrapure water as the solvent. Lift the mesh basket cleaned in step S2 and put it into water tank six for cleaning for 3 minutes.

[0061] S4. Dehydration: After heating and cleaning, remove the mesh basket, pour the NdFeB magnet material into a cotton gauze bag, tighten the bag opening to ensure the NdFeB magnet material has no extra space to move, place it in the dehydration drum of the dehydrator, seal the gaps with a lint-free cloth, and dehydrate until there are no obvious water droplets remaining on the surface of the magnet material. The dehydration frequency is 30Hz, and the time is 2 minutes.

[0062] S5. Drying: First, preheat the drying box to 70℃. Then, pour the dehydrated magnet material into the drying tray of the drying box, spread it out evenly, and quickly move it into the drying box. Set the timer for 10 minutes.

[0063] S6. Inspection: After drying, the magnets are visually inspected under external lighting. If there are no water stains, the dried product can be placed in the designated area.

[0064] Phase and cross-sectional morphology analysis was performed on the dried product obtained in Example 1. See [link to relevant documentation]. Figures 1-3 As shown, from Figure 1 SEM images of the cross-section of the magnet and Figure 2 Compositional analysis reveals that a ceramic phase has formed on the nickel plating of the neodymium iron boron magnet material of this application. Figure 3 The XRD pattern confirmed that the ceramic phase is a SiO2-CeO2 composite ceramic phase. From... Figure 1 The SEM images also show that the nickel plating of the NdFeB magnet material after the cleaning process of this application has better density and no pinholes. Combined with XRD, it can be seen that the rare earth element Nd adsorbs O in the composite ceramic phase to form Nd2O3 phase, which fills the pinholes of the nickel plating, reduces the pinhole corrosion of the nickel plating, and thus reduces the magnetic flux loss of the magnet material.

[0065] Example 2

[0066] The nickel plating on the samarium cobalt magnet material is cleaned and dried. The maximum physical dimension of the samarium cobalt magnet material is 10.1 mm on one side, with a length × width of 10.1 mm × 3 mm.

[0067] S1. Ultrasonic cleaning: Place half a bag of samarium cobalt magnet material into a mesh basket and clean it for 3 minutes in the ultrasonic cleaning machine tank one with ultrapure water as the medium at a temperature of 50°C. Then lift the mesh basket and place it in the ultrasonic cleaning machine tank two at a temperature of 50°C for 3 minutes.

[0068] S2, bubble cleaning: three cleaning tanks are sequentially arranged in the bubble cleaning machine, namely water tank three, water tank four and water tank five, and ultrapure water is added as the cleaning medium in each tank, the temperature is set to 50°C, the basket cleaned in step S1 is lifted and cleaned in water tank three, water tank four and water tank five for 3 minutes each.

[0069] S3, heating cleaning: one water tank six is arranged in the heating cleaning machine, the temperature is set to 80°C, the cleaning medium in water tank six is a plating layer self-repairing cleaning solution, the composition of which is 5vol% of the volume concentration of perfluoropolyether, 1.5wt% of the mass concentration of nanosilane, 100ppm of the mass concentration of CeO2 nanoparticles, and ultrapure water as the solvent, the basket cleaned in step S2 is lifted and cleaned in water tank six for 3 minutes.

[0070] S4, dehydration: after the heating cleaning is completed, the basket is taken out, the samarium-cobalt magnetic steel material is poured into a cotton gauze bag, the bag opening is tightened so that the samarium-cobalt magnetic steel material has no extra moving space, and is placed in the dehydration barrel of the dehydration machine, the gap is tightly stuffed with a dust-free cloth, and dehydration is performed so that there is no obvious water droplet residue on the surface of the magnetic steel material. The dehydration frequency is 50Hz, and the time is 2 minutes.

[0071] S5, drying: the drying box is preheated, the temperature is set to 70°C, then the dehydrated samarium-cobalt magnetic steel material is poured into the baking tray of the drying box, and is quickly moved into the drying box after being laid flat. The time is 20 minutes.

[0072] S6, inspection: the dried samarium-cobalt magnetic steel material is placed under the light of an appearance lamp for visual inspection, and no water stains are found. The finished product is placed in the designated area.

[0073] Example 3

[0074] The nickel plating layer of the aluminum-nickel-cobalt magnetic steel material is cleaned and dried. The physical maximum single-side dimension value of the aluminum-nickel-cobalt magnetic steel material is 6.5mm, and the length x width is 6.5mm x 3.93mm.

[0075] S1, ultrasonic cleaning: the semi-packaged aluminum-nickel-cobalt magnetic steel material is placed in a basket, and is cleaned in ultrasonic cleaning machine water tank one with ultrapure water as the medium, the temperature is controlled to 50°C, and the cleaning time is 3 minutes. Then the basket is lifted and placed in ultrasonic cleaning machine water tank two, the temperature is controlled to 50°C, and the cleaning time is 3 minutes.

[0076] S2, bubble cleaning: three cleaning tanks are sequentially arranged in the bubble cleaning machine, namely water tank three, water tank four and water tank five, and ultrapure water is added as the cleaning medium in each tank, the temperature is set to 50°C, the basket cleaned in step S1 is lifted and cleaned in water tank three, water tank four and water tank five for 3 minutes each.

[0077] S3, heating cleaning: set a water tank six in the heating cleaning machine, set the temperature to 80℃, the cleaning medium in the water tank six is a plated self-repairing cleaning solution, the composition is that the volume concentration of perfluoropolyether is 4vol%, the mass concentration of nanometer silane is 1wt%, the mass concentration of CeO2nanoparticles is 65ppm, take out the cleaned basket in step S2, and put it into the water tank six for cleaning for 3min.

[0078] S4, dehydration: after the heating cleaning is completed, the basket is taken out, the aluminum-nickel-cobalt magnetic steel material is poured into a cotton gauze bag, the bag opening is tightened so that the aluminum-nickel-cobalt magnetic steel material has no extra moving space, then the cotton gauze bag containing the magnetic steel material is placed in the dehydration barrel of the dehydration machine, the gap is tightly stuffed with a dust-free cloth, and dehydration is performed so that there is no obvious water bead residue on the surface of the magnetic steel material. The dehydration frequency is 40Hz, and the time is 2min.

[0079] S5, drying: first, preheat the drying box, set the temperature to 70℃, then pour the dehydrated magnetic steel material into the baking tray of the drying box, lay it flat, and then quickly move it into the drying box, and set the time to 15min.

[0080] S6, inspection: the dried magnetic steel material is placed under the light of the appearance lamp for visual inspection, and there is no water stain. The dried product is placed in the designated area.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 1 is that the temperature of the drying box is set to 100℃. The picture of the dried magnetic steel material under the light is shown in Figure 4 From the figure, it can be seen that the surface of the magnetic steel material dried at this temperature has obvious water stains.

[0083] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical range disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A process for cleaning and drying a magnetic steel nickel plating layer, characterized in that, It comprises the following steps: S1, ultrasonic cleaning: with ultrapure water as medium, the magnetic steel material plated with nickel plating layer is put into the ultrasonic cleaning machine for cleaning; S2, bubble cleaning: with ultrapure water as medium, the magnetic steel material cleaned in step S1 is put into the bubble cleaning machine for cleaning; S3, heating cleaning: with the plating layer self-repairing cleaning solution as medium, the magnetic steel material cleaned in step S2 is put into the heating cleaning tank for cleaning; S4, dehydration: the magnetic steel material cleaned in step S3 is loaded into the dehydration machine for dehydration; S5, drying: the magnetic steel material dehydrated in step S4 is put into the drying box for heating and drying; The active components of the plating layer self-repairing cleaning solution include perfluoropolyether, nanometer silane and CeO2 nanoparticles, and the solvent is ultrapure water; The temperature of ultrasonic cleaning in step S1 is 40-60℃, and the time is 2-10min; the temperature of bubble cleaning in step S2 is 40-60℃, and the time is 2-5min; the heating temperature in step S3 is 75-80℃, and the time is 2-5min; Step S5 is specifically that the magnetic steel material is laid flat in the drying box, and the temperature of the drying box is controlled at 50-70℃, and the drying time is 10-20min.

2. The magnetic steel nickel plating cleaning and drying process according to claim 1, wherein, The volume concentration of perfluoropolyether in the plating layer self-repairing cleaning solution is 3-5vol%, the mass concentration of nanometer silane is 0.5-1.5wt%, and the mass concentration of CeO2 nanoparticles is 30-100ppm.

3. The cleaning and drying process of the magnetic steel nickel plating layer according to claim 1 or 2, characterized in that, The preparation method of the plating layer self-repairing cleaning solution is that perfluoropolyether, nanometer silane and CeO2 nanoparticles are directly added to ultrapure water and ultrasonically dispersed uniformly.

4. The magnetic steel nickel plating cleaning and drying process of claim 1, wherein, In step S1, when the maximum single side size of the magnetic steel material is ≤5.0mm, the ultrasonic cleaning time is 2-5min; when the maximum single side size of the magnetic steel material is >5.0mm, the ultrasonic cleaning time is 4-10min.

5. The magnetic steel nickel plating cleaning and drying process of claim 1, wherein, Step S4 dehydration is specifically that the magnetic steel material cleaned in step S3 is loaded into a storage bag, the bag opening is tied tightly so that the magnetic steel material has no extra moving space, the storage bag containing the magnetic steel material is put into the dehydration barrel of the dehydration machine, the gap between the storage bag and the dehydration barrel is stuffed with dust-free cloth, and then dehydration is carried out.

6. The magnetic steel nickel plating cleaning and drying process of claim 5, wherein, The storage bag in step S4 is a cotton gauze bag, a polyester mesh cloth bag or a mesh nylon cloth bag.

7. The magnetic steel nickel plating cleaning and drying process of claim 6, wherein, The dehydration frequency in step S4 is 30-50Hz, and the time is 1-3min.

8. The magnetic steel nickel plating cleaning and drying process of claim 1, wherein, In step S5, when the length x width of the magnetic steel material is < 18mm 2 , the drying time is 10-15min; when the length x width of the magnetic steel material is ≥ 18mm 2 , the drying time is 15-20min.

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