Preparation of wear-resistant electroless nickel-boron alloy plated on neodymium-iron-boron rare earth permanent magnet material

Abstract

The application provides a preparation method of wear-resistant chemical nickel-boron alloy plating of a neodymium-iron-boron rare earth permanent magnet material, and comprises the following steps: S1, ultrasonic cleaning: in order to remove small metal powder and impurities in the pores of the surface of the part, the part is placed into an ultrasonic cleaning machine, and the part is ultrasonically cleaned with type B pure water for 15-20 minutes, and the ultrasonic cleaning temperature is 10-40 DEG C; S2, magnesium oxide oil removal: in order to completely remove the oil stains of the part, clean soft hair brushes are used to carefully wipe the surface to be plated with magnesium oxide powder for 2-3 times. The application provides a preparation method of wear-resistant chemical nickel-boron alloy plating of a neodymium-iron-boron rare earth permanent magnet material, and the material is subjected to acid corrosion, activation, nickel immersion and chemical nickel-boron plating processes, and then vacuum heat treatment is performed, so that the problem of low corrosion resistance and easy chipping of the neodymium-iron-boron rare earth permanent magnet material is solved, the surface hardness of the part is improved, and the function and service life of the product are increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Nd-Fe-B rare earth permanent magnet material, and particularly relates to a preparation of a wear-resistant chemical nickel-boron alloy plating of Nd-Fe-B rare earth permanent magnet material. BACKGROUND

[0002] Sintered Nd-Fe-B permanent magnet material is widely used in many fields such as electronics, electric power, machinery, medical treatment and the like due to its excellent magnetic properties. For example, it is indispensable to permanent magnet machines, magnetic separators, disk drives and magnetic resonance imaging equipment.

[0003] However, the Nd-Fe-B material contains a high proportion of rare earth element neodymium (Nd), and the chemical properties of neodymium metal are extremely active. Once exposed to air, it will rapidly oxidize, and the surface will become dark. When placed in cold water, the reaction is relatively slow, but when placed in hot water, the reaction rate will be greatly accelerated. Such active chemical properties make the material prone to chemical corrosion and powdering, and the wear resistance is poor, which directly affects the function and service life of the product.

[0004] Therefore, it is necessary to provide a preparation of a wear-resistant chemical nickel-boron alloy plating of Nd-Fe-B rare earth permanent magnet material to solve the above technical problems. SUMMARY

[0005] The present application provides a preparation of a wear-resistant chemical nickel-boron alloy plating of Nd-Fe-B rare earth permanent magnet material, which solves the problem of easy powdering and corrosion, poor wear resistance, and direct impact on the function and service life of the product.

[0006] To solve the above technical problems, the present application provides a preparation of a wear-resistant chemical nickel-boron alloy plating of Nd-Fe-B rare earth permanent magnet material, which includes the following steps:

[0007] S1, ultrasonic cleaning: to remove small metal powder and impurities on the surface and pores of the parts, the parts are placed in an ultrasonic cleaner, and B type pure water is used for ultrasonic cleaning for 15-20 minutes, and the ultrasonic cleaning temperature is 10-40 DEG C;

[0008] S2, magnesium oxide oil removal: to completely remove the oil stains on the parts, a clean soft brush is used to carefully wipe the surface to be plated with magnesium oxide powder for 2-3 times, until the surface of the parts is evenly covered with water film, and then water washing is performed;

[0009] S3, acid corrosion: the parts after step S2 processing are subjected to acid corrosion, and then water washing is performed;

[0010] S4, weak acid activation: the parts after step S3 processing are subjected to weak acid activation, and then water washing is performed;

[0011] S5, nickel immersion treatment: the parts after step S4 processing are subjected to nickel immersion treatment, and then subjected to running water cleaning;

[0012] S6, electroplating nickel: the parts after step S5 processing are subjected to electroplating nickel, and then subjected to running water cleaning;

[0013] S7, chemical plating nickel boron alloy: the parts after step S6 processing are subjected to chemical plating nickel boron alloy, and then subjected to running water cleaning;

[0014] S8, hot pure water washing: the parts after step S7 processing are subjected to hot pure water washing, and then subjected to running water cleaning;

[0015] S9, vacuum hydrogen removal: the Nd-Fe-B permanent magnet material plated with nickel boron alloy should be subjected to vacuum hydrogen removal within 4h, the parts plated with nickel boron alloy are put into a vacuum hydrogen removal box, the vacuum degree is set to 10-1~10-2Pa, the temperature is set to 180~200℃, the hydrogen removal time is 1~2h, when the vacuum degree and the temperature reach the process requirements, the timing starts until the hydrogen removal is completed. The vacuum hydrogen removal process can effectively remove the hydrogen atoms penetrated into the metal lattice through the vacuum negative pressure principle, greatly improving the hydrogen removal effect and efficiency;

[0016] S10, vacuum heat treatment: the parts after vacuum hydrogen removal are put into a vacuum heat treatment furnace, the vacuum degree is set to 10-1~10-2Pa, the temperature is set to 400~420℃, after the vacuum degree reaches the process requirements, the furnace is slowly heated to the process temperature, the timing starts, the holding time is 1h, after the holding is completed, the furnace is cooled to ≤100℃ and taken out, the heat treatment process can form a precipitation hardening effect and precipitate fine Ni3B particles, which can greatly improve the hardness of the coating;

[0017] S11, inspection: the appearance of the coating, the thickness of the coating, the adhesion of the coating and the hardness of the coating of the parts are detected.

[0018] Preferably, the solution formula of the step S3 acid etching is nitric acid 30%~40%, additive urea 5g / L, and the process parameters are temperature 10℃~35℃, time 10s~30s.

[0019] Preferably, the solution formula of the step S4 weak acid activation is citric acid 20g / L~30g / L, and the process parameters are temperature 15℃~35℃, time 1min~3min.

[0020] Preferably, the solution formula of the step S5 nickel immersion treatment is nickel acetate 70g / L~80g / L, hydrofluoric acid 170ml / L~180ml / L, boric acid 60g / L~70g / L, and the process parameters are temperature 15℃~35℃, time 0.5min~1min.

[0021] Preferably, the solution formula of the step S6 electroplating nickel is nickel sulfate 119g / L-161g / L, magnesium sulfate 51g / L-69g / L, sodium sulfate 34g / L-46g / L, boric acid 21.3g / L-28.8g / L, sodium chloride 12.8g / L-17.3g / L, and the process parameters are temperature 18℃-40℃, time 15min-20min, current density (hanging plating) 0.5A / dm2-1.0A / dm2, basket plating / roll plating 0.75A / dm2-1.5A / dm2, and pH value 5.4-5.7.

[0022] Preferably, the solution formula of the step S7 electroless plating nickel boride alloy is nickel chloride 28g / L-32g / L, potassium hydroxide 40g / L-50g / L, ethylenediamine 52g / L-60g / L, potassium borohydride 0.7g / L-0.85g / L, and lead nitrate 0.04g / L, and the process parameters are temperature 88℃-95℃, pH value 14, and deposition rate 10μm / h-20μm / h.

[0023] Preferably, the solution formula of the step S8 hot pure water boiling washing is pure water, and the process parameters are temperature 95℃-100℃ and time 3min-5min.

[0024] Preferably, the inspection method of the step S11 is 100% visual inspection of the plating layer appearance, and the plating layer should be semi-gloss to lustrous silver gray, with fine, uniform and continuous crystallization. The plating layer thickness can be checked by x-ray fluorescence thickness measurement method. The plating layer adhesion can be checked by file method, scribe grid method and peeling method, and the plating layer should not have peeling, falling off or bubbling. The plating layer hardness can be detected by a hardness tester.

[0025] Preferably, in step S2, water rinsing, a rinsing device is required. The rinsing device includes a water tank, a rinsing frame fixedly installed on the top of the water tank, and a water inlet frame fixedly installed on the top of the water tank. A drain valve is fixedly installed at one end of the water tank, and a water pump is fixedly installed at the other end of the water tank. A water pipe is fixedly installed at the output end of the water pump, and a diversion frame is fixedly installed at the output end of the water pipe. The diversion frame is fixedly installed on one side of the rinsing frame, and multiple water outlet pipes are fixedly installed on one side of the diversion frame. The output ends of the multiple water outlet pipes are all located on the inner side of the rinsing frame. A filter frame is fixedly installed on the other side of the cleaning frame, a discharge frame is fixedly installed on one side of the filter frame, a discharge valve is fixedly installed at one end of the discharge frame, a filter plate is fixedly installed on the inner side of the filter frame, a siphon tube is fixedly installed on the top of the filter frame, the input end of the siphon tube is located at the bottom of the inner side of the cleaning frame, a water filling frame is fixedly installed on the top of the siphon tube, a sealing cap is threadedly connected to the top of the water filling frame, a return valve is fixedly installed on the bottom of the filter frame, a return pipe is fixedly installed on the bottom of the return valve, and one end of the return pipe is fixedly installed at one end of the water tank.

[0026] Preferably, an observation window is fixedly installed on the front of the discharge frame.

[0027] Compared with related technologies, the preparation method of wear-resistant electroless nickel-boron alloy for neodymium iron boron rare earth permanent magnet materials provided by the present invention has the following beneficial effects:

[0028] This invention provides a method for preparing wear-resistant electroless nickel-boron alloy for neodymium iron boron rare earth permanent magnet materials. By subjecting the material to acid corrosion, activation, nickel immersion and electroless nickel-boron plating processes, followed by vacuum heat treatment, the problem of low corrosion resistance and easy material flaking of neodymium iron boron permanent magnet materials is solved, the surface hardness of the parts is improved, thereby increasing the functionality and service life of the products. Attached Figure Description

[0029] Figure 1 A schematic diagram of the preparation process of a wear-resistant electroless nickel-boron alloy for neodymium iron boron rare earth permanent magnet materials provided by the present invention.

[0030] Figure 2 A schematic diagram of the structure of a first embodiment of a water-cooling equipment for preparing wear-resistant electroless nickel-boron alloy for neodymium iron boron rare earth permanent magnet materials provided by the present invention;

[0031] Figure 3 for Figure 2 The diagram shows another perspective of the structure.

[0032] Figure 4 for Figure 2 The diagram shows a cross-sectional view of the filter frame.

[0033] Figure 5 The second embodiment of the flow washing equipment for preparing the wear-resistant chemical nickel-boron alloy of the Nd-Fe-B rare earth permanent magnet material is shown in the structure diagram.

[0034] The labels in the diagram are: 1, water tank, 11, water inlet frame, 12, drain valve, 13, washing frame, 2, water pump, 21, water pipe, 22, shunt frame, 23, water outlet pipe, 3, filter frame, 31, discharge frame, 32, discharge valve, 33, filter plate, 34, siphon pipe, 35, water adding frame, 36, sealing cover, 37, backflow valve, 38, backflow pipe, 4, observation window. DETAILED DESCRIPTION

[0035] The application will be further described below in combination with the drawings and embodiments.

[0036] First embodiment

[0037] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , among which, Figure 1 The flow diagram for preparing the wear-resistant chemical nickel-boron alloy of the Nd-Fe-B rare earth permanent magnet material is shown in the diagram; Figure 2 The first embodiment of the flow washing equipment for preparing the wear-resistant chemical nickel-boron alloy of the Nd-Fe-B rare earth permanent magnet material is shown in the structure diagram; Figure 3 is shown in another perspective structure diagram; Figure 2 is shown in another perspective structure diagram; Figure 4 is shown in the filter frame cross-section structure diagram. The preparation of the wear-resistant chemical nickel-boron alloy of the Nd-Fe-B rare earth permanent magnet material includes the following steps: Figure 2 S1, ultrasonic cleaning: to remove the tiny metal powder and impurities in the part surface and pores, the part is put into the ultrasonic cleaner, and the part is cleaned by ultrasonic cleaning with B type pure water for 15-20 minutes, and the ultrasonic cleaning temperature is 10-40℃;

[0038] S2, magnesium oxide oil removal: to completely remove the oil stains on the part, a clean soft brush is used to dip magnesium oxide powder and carefully wipe the surface to be plated 2-3 times, until the part surface is evenly covered with water film, and then flow washing is performed;

[0039] S3, acid corrosion: the part after step S2 processing is subjected to acid corrosion, and then flow washing is performed;

[0040] S4, weak acid activation: the part after step S3 processing is subjected to weak acid activation, and then flow washing is performed;

[0041]

[0042] ​S5, nickel immersion treatment: the parts after step S4 processing are subjected to nickel immersion treatment, and then subjected to running water cleaning;

[0043] S6, electroplating nickel: the parts after step S5 processing are subjected to electroplating nickel, and then subjected to running water cleaning;

[0044] S7, chemical plating nickel boron alloy: the parts after step S6 processing are subjected to chemical plating nickel boron alloy, and then subjected to running water cleaning;

[0045] S8, hot pure water boiling washing: the parts after step S7 processing are subjected to hot pure water boiling washing, and then subjected to running water cleaning;

[0046] S9, vacuum hydrogen removal: the Nd-Fe-B permanent magnet material plated with nickel boron alloy should be subjected to vacuum hydrogen removal within 4h, the parts plated with nickel boron alloy are put into a vacuum hydrogen removal box, the vacuum degree is set to 10-1~10-2Pa, the temperature is set to 180~200℃, the hydrogen removal time is 1~2h, when the vacuum degree and the temperature reach the process requirements, the timing starts until the hydrogen removal is completed. The vacuum hydrogen removal process can effectively remove the hydrogen atoms penetrated into the metal lattice through the vacuum negative pressure principle, greatly improving the hydrogen removal effect and efficiency;

[0047] S10, vacuum heat treatment: the parts after vacuum hydrogen removal are put into a vacuum heat treatment furnace, the vacuum degree is set to 10-1~10-2Pa, the temperature is set to 400~420℃, when the vacuum degree reaches the process requirements, the furnace is slowly heated to the process temperature, the timing starts, the holding time is 1h, after the holding is completed, the furnace is cooled to ≤100℃ and taken out, the heat treatment process can form a precipitation hardening effect and precipitate fine Ni3B particles, which can greatly improve the hardness of the coating;

[0048] S11, inspection: the appearance of the coating, the thickness of the coating, the adhesion of the coating and the hardness of the coating of the parts are detected.

[0049] The solution formula of the step S3 acid etching is nitric acid 30%~40%, additive urea 5g / L, and the process parameters are temperature 10℃~35℃, time 10s~30s.

[0050] The solution formula of the step S4 weak acid activation is citric acid 20g / L~30g / L, and the process parameters are temperature 15℃~35℃, time 1min~3min.

[0051] The solution formula of the step S5 nickel immersion treatment is nickel acetate 70g / L~80g / L, hydrofluoric acid 170ml / L~180ml / L, boric acid 60g / L~70g / L, and the process parameters are temperature 15℃~35℃, time 0.5min~1min.

[0052] The solution formula of the step S6 electroplating nickel is nickel sulfate 119g / L-161g / L, magnesium sulfate 51g / L-69g / L, sodium sulfate 34g / L-46g / L, boric acid 21.3g / L-28.8g / L, sodium chloride 12.8g / L-17.3g / L, and the process parameters are temperature 18℃-40℃, time 15min-20min, current density (hanging plating) 0.5A / dm2-1.0A / dm2, basket plating / roll plating 0.75A / dm2-1.5A / dm2, and pH value 5.4-5.7.

[0053] The solution formula of the step S7 electroless plating nickel boride alloy is nickel chloride 28g / L-32g / L, potassium hydroxide 40g / L-50g / L, ethylenediamine 52g / L-60g / L, potassium borohydride 0.7g / L-0.85g / L, and lead nitrate 0.04g / L, and the process parameters are temperature 88℃-95℃, pH value 14, and deposition speed 10μm / h-20μm / h.

[0054] The solution formula of the step S8 hot pure water boiling washing is pure water, and the process parameters are temperature 95℃-100℃ and time 3min-5min.

[0055] The inspection method of the step S11 is 100% visual inspection of the plating layer appearance, and the plating layer should be semi-gloss to lustrous silver gray, and the plating layer is fine, uniform, and continuous; the plating layer thickness can be checked by x-ray fluorescence thickness measurement; the plating layer adhesion can be checked by file method, scribe grid method, and peeling method, and the plating layer should not have peeling, falling off, and bubbling; and the plating layer hardness can be detected by a hardness tester.

[0056] The step S2 is washed, and the cleaning equipment is used, the cleaning equipment includes water tank 1, the top of water tank 1 is fixedly installed with cleaning frame 13, the top of water tank 1 is also fixedly installed with inlet frame 11, one end of water tank 1 is fixedly installed with drain valve 12, the other end of water tank 1 is fixedly installed with water pump 2, the output of water pump 2 is fixedly installed with water pipe 21, the output of water pipe 21 is fixedly installed with shunt frame 22, shunt frame 22 is fixedly installed on one side of cleaning frame 13, a plurality of water outlet pipes 23 are fixedly installed on one side of shunt frame 22, the output of a plurality of water outlet pipes 23 is arranged on the inner side of cleaning frame 13, the other side of cleaning frame 13 is fixedly installed with filter frame 3, one side of filter frame 3 is fixedly installed with discharge frame 31, one end of discharge frame 31 is fixedly installed with discharge valve 32, the inner side of filter frame 3 is fixedly installed with filter plate 33, the top of filter frame 3 is fixedly installed with siphon 34, the input of siphon 34 is arranged on the bottom of the inner side of cleaning frame 13, the top of siphon 34 is fixedly installed with water adding frame 35, the top of water adding frame 35 is threadedly connected with sealing cover 36, the bottom of filter frame 3 is fixedly installed with backflow valve 37, the bottom of backflow valve 37 is fixedly installed with backflow pipe 38, one end of backflow pipe 38 is fixedly installed on one end of water tank 1.

[0057] When using, the parts to be cleaned are placed in the inner side of cleaning frame 13, then the water pump 2 is started, so that the water pump 2 pumps the liquid in the water tank 1 out, and then the liquid is delivered to the inner side of cleaning frame 13 through water pipe 21, shunt frame 22 and water outlet pipe 23, so that the parts in the inner side of cleaning frame 13 are cleaned, and the sewage after cleaning is siphoned into the inner side of filter frame 3 through siphon 34, then filtered through filter plate 33, and then the water after filtering reenters the inner side of water tank 1, and then is delivered to the inner side of cleaning frame 13 again, and the cycle is repeated, so that the waste of water resources is reduced.

[0058] When discharging is needed, the discharge valve 32 is directly opened, and the impurities can be discharged.

[0059] When using for the first time, the backflow valve 37 is closed, the sealing cover 36 is opened, the liquid is poured into the inner side of filter frame 3, then the sealing cover 36 is closed, and then the backflow valve 37 is opened, so that the siphon 34 is siphoned.

[0060] Compared with the related art, the preparation of the neodymium-iron-boron rare earth permanent magnet wear-resistant chemical nickel-boron alloy provided by the application has the following beneficial effects:

[0061] The method of acid corrosion, activation, nickel immersion and chemical nickel-boron plating process, and vacuum heat treatment, solves the problem of low corrosion resistance of Nd-Fe-B permanent magnet material, and the material is easy to drop, improves the surface hardness of the part, and increases the function and service life of the product.

[0062] Second embodiment

[0063] Please refer to Figure 5 Based on the first embodiment of the application, a preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy is provided, and the second embodiment of the application proposes another preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the implementation of the first embodiment.

[0064] Specifically, the second embodiment of the application provides a preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy, which is different from the first embodiment. The preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy, the front surface of the discharge frame 31 is fixedly installed with an observation window 4.

[0065] The working principle of the preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy provided by the application is as follows:

[0066] When in use, the user can observe the inner side of the discharge frame 31 through the observation window 4, and when the impurities in the discharge frame 31 accumulate too much, the discharge valve 32 can be opened to discharge.

[0067] Compared with the related art, the preparation of a Nd-Fe-B rare earth permanent magnet material wear-resistant chemical nickel-boron alloy provided by the application has the following beneficial effects:

[0068] Through the observation window 4, the inner side of the discharge frame 31 can be observed conveniently, so that the impurities can be discharged in time.

[0069] The above is only an embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A process for the preparation of a wear resistant electroless nickel-boron alloy coating on a neodymium-iron-boron rare earth permanent magnet material, characterized in that, It comprises the following steps: S1, ultrasonic cleaning: to remove the tiny metal powder and impurities in the part surface and pores, the parts are put into the ultrasonic cleaner, and the B type pure water ultrasonic cleaning is carried out for 15-20 min, and the ultrasonic cleaning temperature is 10-40℃; S2, magnesium oxide oil removal: to thoroughly remove the oil stains on the parts, clean soft hair brush is used to dip magnesium oxide powder and carefully wipe the plated surface 2-3 times, until the part surface is evenly covered with water film, and then water washing is carried out; S3, acid corrosion: the parts after step S2 are subjected to acid corrosion, and then water washing is carried out; S4, weak acid activation: the parts after step S3 are subjected to weak acid activation, and then water washing is carried out; S5, nickel immersion treatment: the parts after step S4 are subjected to nickel immersion treatment, and then water washing is carried out; S6, electroplating nickel: the parts after step S5 are subjected to electroplating nickel, and then water washing is carried out; S7, chemical plating nickel boron alloy: the parts after step S6 are subjected to chemical plating nickel boron alloy, and then water washing is carried out; S8, hot pure water washing: the parts after step S7 are subjected to hot pure water washing, and then water washing is carried out; S9, vacuum hydrogen removal: after the neodymium iron boron permanent magnet material is plated with nickel boron alloy, vacuum hydrogen removal should be carried out within 4h, the parts plated with nickel boron alloy are put into the vacuum hydrogen removal box, the vacuum degree is set to 10-1-10-2Pa, the temperature is set to 180-200℃, the hydrogen removal time is 1-2h, when the vacuum degree and temperature reach the process requirements, the timing starts until the hydrogen removal is completed; the vacuum hydrogen removal process can effectively remove the hydrogen atoms penetrated into the metal lattice through the principle of vacuum negative pressure, greatly improving the hydrogen removal effect and efficiency; S10, vacuum heat treatment: the parts after vacuum hydrogen removal are put into the vacuum heat treatment furnace, the vacuum degree is set to 10-1-10-2Pa, the temperature is set to 400-420℃, after the vacuum degree reaches the process requirements, the furnace is slowly heated to the process temperature, and the timing starts, the holding time is 1h, after the holding is completed, the furnace is cooled to ≤100℃ and taken out, the heat treatment process can form precipitation hardening effect and precipitate fine Ni3B particles, which can greatly improve the hardness of the coating; S11, inspection: the appearance of the coating, the thickness of the coating, the adhesion of the coating and the hardness of the coating are detected; The solution formula of step S6 electroplating nickel is nickel sulfate 119-161 g / L, magnesium sulfate 51-69 g / L, sodium sulfate 34-46 g / L, boric acid 21.3-28.8 g / L, sodium chloride 12.8-17.3 g / L, the process parameters are temperature 18-40℃, time 15-20 min, current density (hanging plating) 0.5-1.0 A / dm2, basket plating / roll plating 0.75-1.5 A / dm2, pH value 5.4-5.7; The solution formula of the step S7 electroless nickel-boron alloy plating is nickel chloride 28 g / L-32 g / L, potassium hydroxide 40 g / L-50 g / L, ethylenediamine 52 g / L-60 g / L, potassium borohydride 0.7 g / L-0.85 g / L, lead nitrate 0.04 g / L, and the process parameters are temperature 88 ℃-95 ℃, pH value 14, and deposition rate 10 μm / h-20 μm / h.

2. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The solution formula of the step S3 acid etching is nitric acid 30 %-40 %, and additive urea 5 g / L, and the process parameters are temperature 10 ℃-35 ℃ and time 10 s-30 s.

3. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The solution formula of the step S4 weak acid activation is citric acid 20 g / L-30 g / L, and the process parameters are temperature 15 ℃-35 ℃ and time 1 min-3 min.

4. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The solution formula of the step S5 nickel immersion treatment is nickel acetate 70 g / L-80 g / L, hydrofluoric acid 170 ml / L-180 ml / L, and boric acid 60 g / L-70 g / L, and the process parameters are temperature 15 ℃-35 ℃ and time 0.5 min-1 min.

5. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The solution formula of the step S8 hot pure water boiling washing is pure water, and the process parameters are temperature 95 ℃-100 ℃ and time 3 min-5 min.

6. The preparation of wear resistance electroless nickel-boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The inspection method of the step S11 is 100 % visual inspection of the appearance of the plating layer, the plating layer should be silver gray with semi-gloss to gloss, the plating layer is fine, uniform and continuous; the plating layer thickness can be inspected by χ-ray fluorescence thickness measurement method; the plating layer adhesion can be inspected by file method, scribe grid method and peeling method, and the plating layer should not have peeling, falling off and bubbling phenomenon; The plating layer hardness can be detected by hardness tester.

7. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 1, characterized in that, The step S2 water cleaning needs to use a cleaning device, the cleaning device includes a water tank, a cleaning frame is fixedly installed on the top of the water tank, a water inlet frame is also fixedly installed on the top of the water tank, a drain valve is fixedly installed on one end of the water tank, a water pump is fixedly installed on the other end of the water tank, a water pipe is fixedly installed on the output end of the water pump, a shunt frame is fixedly installed on one side of the cleaning frame, a plurality of water outlet pipes are fixedly installed on one side of the shunt frame, the output ends of the plurality of water outlet pipes are arranged on the inner side of the cleaning frame, a filter frame is fixedly installed on the other side of the cleaning frame, a discharge frame is fixedly installed on one side of the filter frame, a discharge valve is fixedly installed on one end of the discharge frame, a filter plate is fixedly installed on the inner side of the filter frame, a siphon pipe is fixedly installed on the top of the filter frame, the input end of the siphon pipe is arranged on the bottom of the inner side of the cleaning frame, a water adding frame is fixedly installed on the top of the siphon pipe, a sealing cover is threadedly connected to the top of the water adding frame, a backflow valve is fixedly installed on the bottom of the filter frame, and a backflow pipe is fixedly installed on the bottom of the backflow valve.

8. The preparation of wear resistance electroless nickel boron alloy plating of neodymium-iron-boron rare earth permanent magnetic material according to claim 7, characterized in that, The front surface of the discharge frame is fixedly installed with an observation window.

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