CN106435678A - Electroplating pretreatment method and equipment for neodymium-iron-boron magnet - Google Patents
Electroplating pretreatment method and equipment for neodymium-iron-boron magnet Download PDFInfo
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- CN106435678A CN106435678A CN201611039535.5A CN201611039535A CN106435678A CN 106435678 A CN106435678 A CN 106435678A CN 201611039535 A CN201611039535 A CN 201611039535A CN 106435678 A CN106435678 A CN 106435678A
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- magnetic body
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- neodymium iron
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/001—Magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/026—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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- Power Engineering (AREA)
- Environmental & Geological Engineering (AREA)
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- Electroplating Methods And Accessories (AREA)
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Abstract
The invention discloses an electroplating pretreatment method and equipment for a neodymium-iron-boron magnet. The method comprises the following steps: uniformly mixing the sintered neodymium-iron-boron magnet and a proper amount of steel balls, adding the mixture into a specific roller, sequentially performing pretreatment processes such as ultrasonic chemical degreasing, hot washing, nitric acid pickling, primary washing, chemical ash removal, ultrasonic washing, secondary washing and the like on the surface of the sintered neodymium-iron-boron magnet by utilizing the rolling of the roller, and performing surface nickel-plate electroplating. According to the method provided by the invention, the problem that the sintered neodymium-iron-boron magnet has non-uniform surface chemical composition and electrochemistry is solved, high cleanliness of the surface of the sintered neodymium-iron-boron magnet is guaranteed, the binding force of the nickel-plate of the sintered neodymium-iron-boron magnet and the corrosion resistance of the magnet are improved, and the process is high in production efficiency and capable of reducing the productive labor intensity, and can be applied to automatic production.
Description
Technical field
The invention belongs to material surface pre-electroplating treatment field, more particularly, to a kind of pre-electroplating treatment of neodymium iron boron magnetic body
Method and equipment.
Background technology
Neodymium iron boron magnetic body is referred to as third generation rare-earth permanent magnet.Since neodymium iron boron comes out, just with excellent performance, price ratio
And rich in natural resources deposit quickly enters industrialized society, and it is widely used in the high-techs such as electronics, communication, medical treatment, aviation, environmental protection
Skill field.The 21 century NdFeB permanent magnet material gross output value will account for the 40% of the whole permanent magnet material gross output value, and will change whole ten permanent magnetism
The general layout of material.
Nd-Fe-B magnetic material surface porosity porous, chemism are strong, the easily many such as oxide etch defects have a strong impact on
Its range of application.Neodymium iron boron magnetic body mainly has three phase compositions, i.e. principal phase, rich neodymium phase and boron-rich phase, wherein rich neodymium phase and boron-rich
Mutually typically all be distributed in grain boundaries, rich neodymium is mutually easily oxidized, and the volume fraction of magnet principal phase be far longer than rich neodymium phase and
The volume fraction of boron-rich phase, so magnet easily forms the electrochemistry local corrosion feature of the big negative electrode of primary anode, can further speed up
Corrosion；In addition, the corrosion potential of rich neodymium phase is relatively low, it is susceptible to electrochemical corrosion.Therefore magnet must be surface-treated
Protection.
At present, main method neodymium iron boron magnetic body protected is to carry out being plated or coated with the surfaces such as process on its surface
Process.And the key of neodymium iron boron magnetic body process for treating surface is pre-treating technology.If pre-treating technology is suitable, in neodymium-iron-boron
After body surface face forms protective layer, neodymium iron boron magnetic body can apply to various environment.But, the heterogeneous structure of neodymium iron boron magnetic body makes
Magnet is all uneven in chemical composition and electrochemistry, respectively mutually there is very big potential difference, and neodymium iron boron magnetic body is placed in surface
During treatment fluid, different electrochemical reactions can be shown.In addition, the oils and fatss of magnet surface and oxide also can affect the knot of coating
Make a concerted effort.People have carried out substantial amounts of pre-treatment research to neodymium iron boron magnetic body surface, and pre-treating method the most frequently used at present is：Grind
Chamfering alkaline degreasing nitric acid acidwashing ammonium fluoride activation etc..This pre-treating method is artificial operation, high labor intensive, operation
Standard and time are difficult to control to, and the uniformity on neodymium iron boron surface and cleanliness factor do not ensure that, neodymium-iron-boron body surface after pickling
Face may remaining acid solution, cause matrix bad with binding force of cladding material, conforming product rate decline.
Thus it is guaranteed that neodymium iron boron magnetic body surface uniformity and cleanliness factor are the keys improving binding force of cladding material, and good
Uniformity and cleanliness factor need good pre-treating technology.So, be badly in need of find one kind can standard operation, reduce labor intensity carry
The high automatic pre-treating technology producing qualification rate, solves the problems, such as current neodymium iron boron magnetic body craft pre-treatment.
Content of the invention
It is an object of the invention to solution at least the above, and provide the advantage that at least will be described later.
It is an object of the invention to provide a kind of electro-plating pre-treatment method of iron boron magnet and equipment, it is effective to ensure that magnet
Surface uniformity and cleanliness factor, improve matrix and binding force of cladding material, improve corrosion resistance, reduce labor intensity, improve product life
Produce qualification rate, realize automated production.
The invention provides a kind of electro-plating pre-treatment method of neodymium iron boron magnetic body and equipment, by Sintered NdFeB magnet with suitable
It is placed in together in specific roll after dimension pearl mix homogeneously, using the rolling of cylinder, Sintered NdFeB magnet surface is entered successively
Row sonochemistry oil removing, hot water wash, nitric acid acidwashing, once the pre-treatment work such as washing, chemical ash disposal, ultrasonic washing, secondary washing
Carry out plating nickel on surface layer plating after sequence.
The present invention provides a kind of electro-plating pre-treatment method of neodymium iron boron magnetic body, and it comprises the following steps：
Weight by Sintered NdFeB magnet or Sintered NdFeB magnet with less than described Sintered NdFeB magnet
It is placed in a cylinder after steel ball mixing, described cylinder is provided with the through hole for allowing pretreatment liquid to pass through；
Described cylinder with described Sintered NdFeB magnet and described steel ball is placed in described pretreatment liquid, and makes
Described rollers roll is to carry out the pre-electroplating treatment of neodymium iron boron magnetic body.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, a diameter of 2mm-6mm of described steel ball.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, a diameter of 3mm-4mm of described steel ball.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, the rotating speed of described cylinder is 8-12 rev/min
Clock.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, the rotating speed of described cylinder is 9-10 rev/min
Clock.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, locate before the plating of described neodymium iron boron magnetic body
Reason, comprises the following steps：
Described cylinder with described Sintered NdFeB magnet and described steel ball is positioned over the first pretreatment liquid by step one
Carry out sonochemistry oil removing, described first pretreatment liquid is metal cleaner solution, its concentration is 30-80g/L, temperature is in groove
50-70 DEG C, the oil removing time is 1.5-3.5 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 just step one is processed is put
Put to process in liquid bath before second and carry out hot water wash, washing temperature is 70-90 DEG C, washing time is 1-3 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 is processed by step 3 is placed
Process in liquid bath before the 3rd and carry out nitric acid acidwashing, described concentration of nitric acid is 40～55ml/L, described pickling time is 90～130
Second, once washed afterwards, a washing time is the 30-60 second.
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 3 is processed by step 4 is placed
Process in liquid bath before the 4th and carry out chemical ash disposal process, the 4th pretreatment liquid is oxalic acid solution, concentration is 20～60g/L, changes
Learn the ash disposal time for 30～60 seconds；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 4 is processed by step 5 is placed
Process in liquid bath before the 5th and carry out ultrasonic washing process, ultrasonic washing time is 1.5～3 minutes, carries out secondary washing afterwards,
Secondary washing time is 15～60 seconds.
Preferably, in the electro-plating pre-treatment method of described neodymium iron boron magnetic body, locate before the plating of described neodymium iron boron magnetic body
Reason, comprises the following steps：
Described cylinder with described Sintered NdFeB magnet and described steel ball is positioned over the first pretreatment liquid by step one
Carry out sonochemistry oil removing, described first pretreatment liquid is metal cleaner solution, its concentration is 40-50g/L, temperature is in groove
60-65 DEG C, the oil removing time is 2-2.5 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 just step one is processed is put
Put to process in liquid bath before second and carry out hot water wash, washing temperature is 80-85 DEG C, washing time is 1.5-2 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 is processed by step 3 is placed
Before the 3rd process liquid bath in carry out nitric acid acidwashing, described concentration of nitric acid be 45～50ml/L, described pickling time be 100～
115 seconds, once washed afterwards, a washing time is the 45-55 second.
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 3 is processed by step 4 is placed
Process in liquid bath before the 4th and carry out chemical ash disposal process, the 4th pretreatment liquid is oxalic acid solution, concentration is 35～50g/L, changes
Learn the ash disposal time for 40～50 seconds；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 4 is processed by step 5 is placed
Process in liquid bath before the 5th and carry out ultrasonic washing process, ultrasonic washing time is 1.5～2 minutes, carries out secondary washing afterwards,
Secondary washing time is 25～35 seconds.
The present invention also provides a kind of pre-electroplating treatment equipment of neodymium iron boron magnetic body, and it includes：
Cylinder, is provided with the through hole that pretreatment liquid passes through, is filled with neodymium iron boron magnetic body and steel ball in described cylinder；
Multiple pre-treatment liquid baths, its internal memory is placed with pretreatment liquid, and the plurality of pre-treatment liquid bath is according to wherein pre-treatment
The species of liquid is arranged in order according to the sequencing of pretreatment procedure；
Wherein, described cylinder is placed sequentially in the plurality of pre-treatment liquid bath and rolls the electricity completing neodymium iron boron magnetic body
Treatment before plating.
Preferably, in the pre-electroplating treatment equipment of described neodymium iron boron magnetic body, described cylinder is arranged on a framework, institute
The side stating cylinder is coaxially arranged with a driven gear, and driven gear and driving gear are meshed, and driving gear passes through one actively
It is pivotally connected to one first driver.
Preferably, in the pre-electroplating treatment equipment of described neodymium iron boron magnetic body,
The middle part level of described framework extends to both sides and forms horizontal support arms, and described horizontal support arms are prolonged vertically downward
Stretch formation one vertical support arm；
The both sides of the plurality of pre-treatment liquid bath are provided with two conveyer belts, described two conveyer belt run-in synchronisms, and institute
The lower end stating vertical support arm is contacted with described conveyer belt, described two conveyer belts rotate forward under the driving of the second driver or
Person inverts；
Controller, have in advance in it process time of each pretreatment procedure, the speed of service of conveyer belt and multiple before
Process the distance between liquid bath, and according to current pretreatment procedure to described second driver send forward or reverse, unlatching or
The order that person closes.
Beneficial effects of the present invention：
The present invention adopts cylinder outer ultrasonic, on the one hand can preferably carry out automation mechanized operation, reduces labor intensity；Another
Aspect ultrasonic washing after the ash disposal effect of oxalic acid solution, can clean the remaining acid solution of matrix surface and miscellaneous to greatest extent
Matter, it is ensured that the uniformity of neodymium iron boron matrix and cleanliness factor, is taken a firm foundation for guarantee galvanization coating adhesion, simultaneously to neodymium ferrum
The corrosion resistance of boryl body is also improved to some extent.In addition, adopting oxalic acid solution ash disposal, neodymium iron boron matrix surface is made to occur
A certain degree of passivation, plays and prevents oxidized in follow-up washing and electroplating process, corrosion effect, improve binding force of cladding material
And corrosion resistance.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part also will be by this
Invention research and practice and be understood by the person skilled in the art.
Brief description
The structure of the cylinder of one embodiment of the pre-electroplating treatment equipment of the neodymium iron boron magnetic body that Fig. 1 provides for the present invention is shown
It is intended to；
Cylinder in one embodiment of the pre-electroplating treatment equipment of the neodymium iron boron magnetic body that Fig. 2 provides for the present invention is placed on
Structural representation in pre-treatment liquid bath.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
It should be appreciated that used herein such as " have ", "comprising" and " inclusion " term do not allot one or many
The presence of individual other element or a combination thereof or interpolation.
As depicted in figs. 1 and 2, the present invention provides a kind of pre-electroplating treatment equipment of neodymium iron boron magnetic body, and it includes：
Cylinder 4, is provided with the through hole that pretreatment liquid passes through, is filled with neodymium iron boron magnetic body and steel ball in described cylinder 4；
Multiple pre-treatment liquid baths 7, its internal memory is placed with pretreatment liquid 6, and the plurality of pre-treatment liquid bath 7 is according to wherein front place
The species of reason liquid is arranged in order according to the sequencing of pretreatment procedure；
Wherein, described cylinder 4 is placed sequentially in the plurality of pre-treatment liquid bath 7 and rolls to complete neodymium iron boron magnetic body
Pre-electroplating treatment；
Cylinder 4 is arranged on a framework 1, and the side of cylinder 4 is coaxially arranged with a driven gear 5, driven gear 5 and active
Gear 2 is meshed, and driving gear 2 is connected to driver by a driving shaft 3, and then completes the rolling of cylinder.
In the pre-electroplating treatment equipment of described neodymium iron boron magnetic body,
The middle part level of described framework extends to both sides and forms horizontal support arms, and described horizontal support arms are prolonged vertically downward
Stretch formation one vertical support arm；
The both sides of the plurality of pre-treatment liquid bath are provided with two conveyer belts, described two conveyer belt run-in synchronisms, and institute
The lower end stating vertical support arm is contacted with described conveyer belt, described two conveyer belts rotate forward under the driving of the second driver or
Person inverts；
Controller, have in advance in it process time of each pretreatment procedure, the speed of service of conveyer belt and multiple before
Process the distance between liquid bath, and according to current pretreatment procedure to described second driver send forward or reverse, unlatching or
The order that person closes.
Embodiment 1
(1) neodymium iron boron magnetic body and a diameter of 3mm of 2.5Kg that are 6.91*6.91*0.85*4-R1.24 by 2.5Kg specification
After steel ball mix homogeneously, pour in the cylinder shown in Fig. 1；
(2) sonochemistry oil removal treatment, prepares sonochemistry and removes oil solution, comprise TJ30-1 type metal cleaner in solution
50g/L, remaining is deionized water or distilled water；Degreasing fluid is heated to 65 DEG C, by the cylinder of step (1) according to Fig. 2 structure
Mode is put in the trough preparing electrochemical deoiling liquid, under the rotation of cylinder, drives neodymium iron boron magnetic body to overturn together with steel ball
Carry out sonochemistry oil removing, the oil removing time is 2 minutes, the rotating speed of its intermediate roll is 10 revs/min.
(3) hot water wash is processed, and will put into 80 DEG C through the neodymium iron boron magnetic body of sonochemistry oil removing and steel ball together with cylinder
Carry out flowing cleaning, hot water is the deionized water of flowing, cleaning process intermediate roll is also being turned over 10 revs/min of speed in hot water
Rolling.
(4) nitric acid acidwashing is processed, and prepares salpeter solution, and concentration of nitric acid is 45ml/L, and remaining is water, will be through step (3)
Neodymium iron boron magnetic body carry out roll pickling, pickling time be 110 seconds.
(5) chemical ash disposal is processed, and prepares chemical ash disposal liquid, and this solution includes oxalic acid 30g/L, and remaining is deionized water or steaming
Distilled water, the neodymium iron boron magnetic body through step (4) is put into chemical removing and carries out in lixivium rolling ash disposal, the ash disposal time is 35 seconds, rolling
Cylinder rotating speed is 10 revs/min.
(6) ultrasonic washing process, the neodymium iron boron magnetic body through step (5) is carried out ultrasonic rolling and washes, the time is 2 points
Clock, drum rotation speed is 10 revs/min.
(7) pure washing process, the neodymium iron boron magnetic body through step (6) is carried out pure water and washes, and washing time is 30 seconds, cylinder
10 revs/min of rotating speed.
(8) electronickelling cupro-nickel coating, by through step (7) be loaded with neodymium iron boron magnetic body and the cylinder of steel ball is put in plating solution
Carry out electronickelling cupro-nickel coating.
Embodiment 2
(1) neodymium iron boron magnetic body and a diameter of 3mm of 1.5Kg that are 9.14*9.14*0.85*4-R1.21 by 1.5Kg specification
After steel ball mix homogeneously, pour in the cylinder shown in Fig. 1；
(2) sonochemistry oil removal treatment, prepares sonochemistry and removes oil solution, comprise TJ30-1 type metal cleaner in solution
50g/L, remaining is deionized water or distilled water；Degreasing fluid is heated to 70 DEG C, by the cylinder of step (1) according to Fig. 2 structure
Mode is put in the trough preparing electrochemical deoiling liquid, under the rotation of cylinder, drives neodymium iron boron magnetic body to overturn together with steel ball
Carry out sonochemistry oil removing, the oil removing time is 2.5 minutes, the rotating speed of its intermediate roll is 12 revs/min.
(3) hot water wash is processed, and will put into 85 DEG C through the neodymium iron boron magnetic body of sonochemistry oil removing and steel ball together with cylinder
Carry out flowing cleaning, hot water is the deionized water of flowing, cleaning process intermediate roll is also being turned over 8 revs/min of speed in hot water
Rolling.
(4) nitric acid acidwashing is processed, and prepares salpeter solution, and concentration of nitric acid is 45ml/L, and remaining is water, will be through step (3)
Neodymium iron boron magnetic body carry out roll pickling, pickling time be 100 seconds.
(5) chemical ash disposal is processed, and prepares chemical ash disposal liquid, and this solution includes oxalic acid 50g/L, and remaining is deionized water or steaming
Distilled water, the neodymium iron boron magnetic body through step (4) is put into chemical removing and carries out in lixivium rolling ash disposal, the ash disposal time is 30 seconds, rolling
Cylinder rotating speed is 12 revs/min.
(6) ultrasonic washing process, the neodymium iron boron magnetic body through step (5) is carried out ultrasonic rolling and washes, the time is 2 points
Clock, drum rotation speed is 12 revs/min.
(7) pure washing process, the neodymium iron boron magnetic body through step (6) is carried out pure water and washes, and washing time is 30 seconds, cylinder
12 revs/min of rotating speed.
(8) electronickelling cupro-nickel coating, by through step (7) be loaded with neodymium iron boron magnetic body and the cylinder of steel ball is put in plating solution
Carry out electronickelling cupro-nickel coating.
Embodiment 3
(1) steel ball of the neodymium iron boron magnetic body 3-4mm a diameter of with 2.5Kg being D24.7*4.5 by 3.0Kg specification is mixed homogeneously
Afterwards, pour in the cylinder shown in Fig. 1；
(2) sonochemistry oil removal treatment, prepares sonochemistry and removes oil solution, comprise TJ30-1 type metal cleaner in solution
50g/L, remaining is deionized water or distilled water；Degreasing fluid is heated to 65 DEG C, by the cylinder of step (1) according to Fig. 2 structure
Mode is put in the trough preparing electrochemical deoiling liquid, under the rotation of cylinder, drives neodymium iron boron magnetic body to overturn together with steel ball
Carry out sonochemistry oil removing, the oil removing time is 2 minutes, the rotating speed of its intermediate roll is 8 revs/min.
(3) hot water wash is processed, and will put into 90 DEG C through the neodymium iron boron magnetic body of sonochemistry oil removing and steel ball together with cylinder
Carry out flowing cleaning, hot water is the deionized water of flowing, cleaning process intermediate roll is also being turned over 8 revs/min of speed in hot water
Rolling.
(4) nitric acid acidwashing is processed, and prepares salpeter solution, and concentration of nitric acid is 45ml/L, and remaining is water, will be through step (3)
Neodymium iron boron magnetic body carry out roll pickling, pickling time be 120 seconds.
(5) chemical ash disposal is processed, and prepares chemical ash disposal liquid, and this solution includes oxalic acid 30g/L, and remaining is deionized water or steaming
Distilled water, the neodymium iron boron magnetic body through step (4) is put into chemical removing and carries out in lixivium rolling ash disposal, the ash disposal time is 40 seconds, rolling
Cylinder rotating speed is 8 revs/min.
(6) ultrasonic washing process, the neodymium iron boron magnetic body through step (5) is carried out ultrasonic rolling and washes, the time is 2.5 points
Clock, drum rotation speed is 8 revs/min.
(7) pure washing process, the neodymium iron boron magnetic body through step (6) is carried out pure water and washes, and washing time is 45 seconds, cylinder
8 revs/min of rotating speed.
(8) electronickelling cupro-nickel coating, by through step (7) be loaded with neodymium iron boron magnetic body and the cylinder of steel ball is put in plating solution
Carry out electronickelling cupro-nickel coating.
Comparative example
The neodymium iron boron magnetic body for 6.91*6.91*0.85*4-R1.24 for the specification is carried out manual behaviour by following pre-treating technology
Make：Grind after chamfering alkaline degreasing washing nitric acid acidwashing washing ammonium fluoride activation pure water is washed and carry out electronickelling copper
Nickel coating.
The method of testing of embodiment 1～3 and comparative example 1 and result
Test the neodymium-iron-boron through different pre-treatments PROCESS FOR TREATMENT with the experiment of 1.7m free-electron model and neutral salt spray test
Body is studied with the adhesion of electronickelling cupro-nickel coating and decay resistance, and result is as shown in table 1.
Table 1
As it can be seen from table 1 electronickelling cupro-nickel plating after being processed with the automatic pre-treating technology in neodymium iron boron magnetic body surface of the present invention
The neodymium iron boron magnetic body of layer, can bear 60 experiments of the high free-electron model of 1.7m, coating surface no bubbles, obscission, and can
To bear surface no point corrosion after the neutral salt spray test of 168h.And the sample 60 of the pre-treating technology in comparative example 1
Have 53 foaming phenomena that come off after secondary drop test, and start spot corrosion occurs after neutral salt spray test 72h, rise
Bubble phenomenon.
Although embodiment of the present invention is disclosed as above, it is not restricted to listed in description and embodiment
With, it can be applied to various suitable the field of the invention completely, for those skilled in the art, can be easily
Realize other modification, therefore under the general concept being limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (10)
1. the electro-plating pre-treatment method of neodymium iron boron magnetic body is it is characterised in that comprise the following steps：
Steel ball by Sintered NdFeB magnet or Sintered NdFeB magnet and the weight less than described Sintered NdFeB magnet
It is placed in after mixing in a cylinder, described cylinder is provided with the through hole for allowing pretreatment liquid to pass through；
Described cylinder with described Sintered NdFeB magnet and described steel ball is placed in described pretreatment liquid, and makes described
Rollers roll is to carry out the pre-electroplating treatment of neodymium iron boron magnetic body.
2. neodymium iron boron magnetic body as claimed in claim 1 electro-plating pre-treatment method it is characterised in that described steel ball a diameter of
2mm-6mm.
3. neodymium iron boron magnetic body as claimed in claim 1 electro-plating pre-treatment method it is characterised in that described steel ball a diameter of
3mm-4mm.
4. the electro-plating pre-treatment method of neodymium iron boron magnetic body as claimed in claim 1 is it is characterised in that the rotating speed of described cylinder is
8-12 rev/min.
5. the electro-plating pre-treatment method of neodymium iron boron magnetic body as claimed in claim 1 is it is characterised in that the rotating speed of described cylinder is
9-10 rev/min.
6. the electro-plating pre-treatment method of the neodymium iron boron magnetic body as described in any one of claim 1-5 is it is characterised in that described neodymium ferrum
The pre-electroplating treatment of boron magnet, comprises the following steps：
Described cylinder with described Sintered NdFeB magnet and described steel ball is positioned in the first pre-treatment liquid bath step one
Carry out sonochemistry oil removing, described first pretreatment liquid is metal cleaner solution, its concentration is 30-80g/L, temperature is 50-
70 DEG C, the oil removing time is 1.5-3.5 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 just step one is processed is placed on
Carry out hot water wash, washing temperature is 70-90 DEG C, washing time is 1-3 minute in second pre-treatment liquid bath；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 is processed by step 3 is placed on
Carry out nitric acid acidwashing, described concentration of nitric acid is 40～55ml/L, described pickling time is 90～130 seconds in three pre-treatment liquid baths,
Once washed afterwards, a washing time is the 30-60 second.
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 3 is processed by step 4 is placed on
Carry out chemical ash disposal process, the 4th pretreatment liquid is oxalic acid solution, concentration is 20～60g/L, chemistry removes in four pre-treatment liquid baths
The grey time is 30～60 seconds；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 4 is processed by step 5 is placed on
Carry out ultrasonic washing process, ultrasonic washing time is 1.5～3 minutes, carries out secondary washing afterwards, secondary in five pre-treatment liquid baths
Washing time is 15～60 seconds.
7. the electro-plating pre-treatment method of the neodymium iron boron magnetic body as described in any one of claim 1-5 is it is characterised in that described neodymium ferrum
The pre-electroplating treatment of boron magnet, comprises the following steps：
Described cylinder with described Sintered NdFeB magnet and described steel ball is positioned in the first pre-treatment liquid bath step one
Carry out sonochemistry oil removing, described first pretreatment liquid is metal cleaner solution, its concentration is 40-50g/L, temperature is 60-
65 DEG C, the oil removing time is 2-2.5 minute；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 just step one is processed is placed on
Carry out hot water wash, washing temperature is 80-85 DEG C, washing time is 1.5-2 minute in second pre-treatment liquid bath；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 2 is processed by step 3 is placed on
Carry out nitric acid acidwashing, described concentration of nitric acid is 45～50ml/L, described pickling time is 100～115 seconds in three pre-treatment liquid baths,
Once washed afterwards, a washing time is the 45-55 second.
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 3 is processed by step 4 is placed on
Carry out chemical ash disposal process, the 4th pretreatment liquid is oxalic acid solution, concentration is 35～50g/L, chemistry removes in four pre-treatment liquid baths
The grey time is 40～50 seconds；
The described cylinder with described Sintered NdFeB magnet and described steel ball after step 4 is processed by step 5 is placed on
Carry out ultrasonic washing process, ultrasonic washing time is 1.5～2 minutes, carries out secondary washing afterwards, secondary in five pre-treatment liquid baths
Washing time is 25～35 seconds.
8. the pre-electroplating treatment equipment of neodymium iron boron magnetic body is it is characterised in that include：
Cylinder, is provided with the through hole that pretreatment liquid passes through, is filled with neodymium iron boron magnetic body and steel ball in described cylinder；
Multiple pre-treatment liquid baths, its internal memory is placed with pretreatment liquid, and the plurality of pre-treatment liquid bath is according to wherein pretreatment liquid
Species is arranged in order according to the sequencing of pretreatment procedure；
Wherein, before described cylinder is placed sequentially in the plurality of pre-treatment liquid bath and rolls the plating completing neodymium iron boron magnetic body
Process.
9. the pre-electroplating treatment equipment of neodymium iron boron magnetic body as claimed in claim 8 is it is characterised in that described cylinder is arranged on one
On framework, the side of described cylinder is coaxially arranged with a driven gear, and driven gear and driving gear are meshed, and driving gear leads to
Cross one and be actively pivotally connected to one first driver.
10. neodymium iron boron magnetic body as claimed in claim 9 pre-electroplating treatment equipment it is characterised in that
The middle part level of described framework extends to both sides and forms horizontal support arms, and described horizontal support arms extend shape vertically downward
Become a vertical support arm；
The both sides of the plurality of pre-treatment liquid bath are provided with two conveyer belts, described two conveyer belt run-in synchronisms, and described perpendicular
The lower end of allotment brace is contacted with described conveyer belt, and described two conveyer belts rotate forward or anti-under the driving of the second driver
Turn；
Controller, has the process time of each pretreatment procedure, the speed of service of conveyer belt and multiple pre-treatment in advance in it
The distance between liquid bath, and forward or reverse, unlatching or pass are sent to described second driver according to current pretreatment procedure
The order closed.
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| CN108435676A (en) * | 2018-02-23 | 2018-08-24 | 廊坊京磁精密材料有限公司 | The glue-removing equipment and method of sintered NdFeB |
| CN110093646A (en) * | 2019-04-26 | 2019-08-06 | 厦门建霖健康家居股份有限公司 | A kind of electro-plating method of magnetic structure |
| CN110810932A (en) * | 2019-11-05 | 2020-02-21 | 湖南创一电子科技股份有限公司 | Production process of electronic cigarette magnetic core |
| CN111926369A (en) * | 2020-08-18 | 2020-11-13 | 重庆华永金属表面处理有限公司 | Automatic electroplating production process |
| CN112725855A (en) * | 2020-12-28 | 2021-04-30 | 安徽大地熊新材料股份有限公司 | Preparation method of high-bonding-force high-corrosion-resistance coating on surface of neodymium iron boron magnet |
| CN114808064A (en) * | 2022-04-27 | 2022-07-29 | 包头市英思特稀磁新材料股份有限公司 | Forced flushing device and automatic pretreatment system before rare earth permanent magnet electroplating |
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| CN110810932A (en) * | 2019-11-05 | 2020-02-21 | 湖南创一电子科技股份有限公司 | Production process of electronic cigarette magnetic core |
| CN111926369A (en) * | 2020-08-18 | 2020-11-13 | 重庆华永金属表面处理有限公司 | Automatic electroplating production process |
| CN112725855A (en) * | 2020-12-28 | 2021-04-30 | 安徽大地熊新材料股份有限公司 | Preparation method of high-bonding-force high-corrosion-resistance coating on surface of neodymium iron boron magnet |
| CN112725855B (en) * | 2020-12-28 | 2022-05-10 | 安徽大地熊新材料股份有限公司 | Preparation method of high-bonding-force high-corrosion-resistance coating on surface of neodymium iron boron magnet |
| CN114808064A (en) * | 2022-04-27 | 2022-07-29 | 包头市英思特稀磁新材料股份有限公司 | Forced flushing device and automatic pretreatment system before rare earth permanent magnet electroplating |
| CN114808064B (en) * | 2022-04-27 | 2023-04-21 | 包头市英思特稀磁新材料股份有限公司 | Forced flushing device before rare earth permanent magnet electroplating and automatic pretreatment system |
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