CN108364780A - A kind of preparation method of Sintered NdFeB magnet surface high-corrosion-resistance coating - Google Patents
A kind of preparation method of Sintered NdFeB magnet surface high-corrosion-resistance coating Download PDFInfo
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- CN108364780A CN108364780A CN201810438127.XA CN201810438127A CN108364780A CN 108364780 A CN108364780 A CN 108364780A CN 201810438127 A CN201810438127 A CN 201810438127A CN 108364780 A CN108364780 A CN 108364780A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0572—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
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Abstract
The invention discloses a kind of preparation methods of Sintered NdFeB magnet surface high-corrosion-resistance coating, the neodymium iron boron magnetic body of machine-shaping is pre-processed, further include that pretreated neodymium iron boron product is immersed in pretreatment liquid, the pretreatment liquid is formed by distilled water, film agent and accelerator mixed preparing；By the neodymium iron boron magnetic body surface of ZnAl masking liquids primary coat after steeping, the neodymium iron boron magnetic body for being primed with ZnAl coatings is obtained；Rich Al painting liquid levels are coated in the neodymium iron boron magnetic body surface after primary coat, obtain high anti-corrosion neodymium iron boron magnetic body.By twice spray treatment, the porosity between magnet and corrosive medium is effectively reduced, improves the binding force between coating and magnet, makes Sintered NdFeB magnet that there is good corrosion resistance.The ZnAl coatings of primary coat make to greatly reduce into the deeper medium of coating, to which magnet high temperature resistance high pressure and ageing resistance be greatly improved.
Description
Technical field
The present invention relates to magnetic material surfacecti proteon fields, and in particular to a kind of Sintered NdFeB magnet surface high-corrosion-resistance painting
The preparation method of layer.
Background technology
Neodymium iron boron (NdFeB) permanent magnet has good magnetic property, wherein theoretical magnetic energy product is up to 64MGOe, extensive use
In numerous areas such as aerospace, medical instrument, wind-power electricity generation, energy saving household electrical appliances, new-energy automobiles.But the burning with heterogeneous structure
Neodymium iron boron is tied because, there are larger potential difference, causing magnet to be easily corroded in corrosive medium between each phase, seriously limiting
The application field of Sintered NdFeB magnet.In order to improve the corrosion resistance of sintered NdFeB, common safeguard procedures mainly have two
Class：(1) Alloying Treatment；Trace element is added i.e. into magnet and forms cenotype in magnet grain boundaries, to reduce crystal boundary rich-Nd phase
Reactivity, the corrosion resistance of magnet can be improved to a certain extent, but the addition of alloying element is often to sacrifice corresponding magnetic
Performance is cost, should not be used.(2) surfacecti proteon is handled；This method can significantly be promoted under conditions of not reducing magnetic property
The corrosion resistance of magnet, common process for treating surface have plating Zn, electroplated Ni-Cu-Ni, chemical Ni-P plating, phosphatization, cathode
Electrophoresis, physical vapour deposition (PVD) etc..
For common metal matrix, plating Zn coating can play preferable protective action as sacrificial anode coating,
And the rich-Nd phase current potential of Sintered NdFeB magnet is more negative compared with Zn coating, and Zn coating is made to lose advantage, and deposited in electroplating process
In point effect, in electrochemical environment so that at Zn plating defects, magnet surface occurs to inhale hydrogen-type corrosion, generates loose more
The corrosion product in hole, and then the waste liquid for leading to further corroding for magnet, while generating increases the cost of plating；And due to
Traditional electroplating technology mainly carries out in aqueous solution, and evolving hydrogen reaction easily occurs in electroplating process, and coating is also easy to produce hydrogen embrittlement.Metal
Al coatings are also used the surfacecti proteon of sintered NdFeB, and wherein magnetron sputtering Al films grow for columnar crystal structure, and intergranular has
Apparent gap makes corrosive medium more easily and substrate contact, accelerates magnet corrosion, and there are works for existing Al films protective coating
Skill is complicated, and the requirement to equipment is more harsh, it is difficult to realize large-scale industrialized production.Therefore, a kind of Nd-Fe-B is developed
The high anti-corrosion coating of magnet surface becomes a problem urgently to be resolved hurrily.
Invention content
Present invention seek to address that the above problem, provides a kind of preparation side of the high anti-corrosion coating of sintered NdFeB magnet surface
Method includes pre-processing the neodymium iron boron magnetic body of machine-shaping, further comprising the steps of：
A. it impregnates：Pretreated neodymium iron boron product is immersed in pretreatment liquid, the pretreatment liquid is by distilled water, skin
Film and accelerator mixed preparing form；
B. primary coat：By the neodymium iron boron magnetic body surface of ZnAl masking liquids primary coat after steeping, the neodymium for being primed with ZnAl coatings is obtained
Iron boron magnet；
C. face applies：Rich Al painting liquid levels are coated in and obtain high anti-corrosion neodymium iron through treated the neodymium iron boron magnetic body surfaces step b
Boron magnet.
Further scheme further includes pre-firing process between the step a and step b, in the pre-firing process, preliminary drying
Roasting temperature is 60~90 DEG C, and the prebake conditions time is 2~5min.
Further scheme, it is described pretreatment be the neodymium iron boron magnetic body of machine-shaping is carried out successively chamfering, alkali cleaning, pickling and
Washing process；
The chamfered, it is 0.1~0.6mm to make the angles R of chamfering；
Neodymium iron boron magnetic body is fitted into be placed in lye in mesh bag by the alkali cleaning to be impregnated, added with surface-active in the lye
Agent；
The nitric acid for the pickle a concentration of 3%~6% that the pickling uses, pickling time are 40~80s；
Neodymium iron boron magnetic body after pickling is placed in distilled water by the washing to be cleaned by ultrasonic, and scavenging period is 1~3min.
Preferably, the surfactant is OP emulsifiers.
Further scheme, the film agent are YL-701 nanometers of non-phosphate film agents, and the accelerator is YL-702 accelerators；
The volume ratio of distilled water, YL-701 nanometer non-phosphate film agent and YL-702 accelerators is 800~1200 in the pretreatment liquid:40
~60:5~15, neodymium iron boron magnetic body soaking time in pretreatment liquid is 2~5min..
Further scheme, it is 26~34s that the ZnAl that the primary coat uses, which applies fluid viscosity, and masking liquid temperature is 15~30 DEG C；Institute
It includes spraying, surface drying and solidification, baking to state primary coat process, and neodymium iron boron magnetic body positive and negative carries out above-mentioned primary coat process successively.
Further scheme, the technological parameter of the spraying are to spray 15~30ml/min of oil mass, spray governor pressure 0.4~
0.6MPa, 0.2~0.26MPa of atomizing pressure；The surface drying is 100~130 DEG C with solidification temperature, and the time is 2~10min；Institute
Baking is stated, magnet front baking temperature is 100~140 DEG C, and baking time is 20~50min；Magnet reverse side baking temperature is 210
~240 DEG C, baking time is 20~50min.
Further scheme, it is 28~38s that the face, which applies the rich Al used and applies fluid viscosity, and masking liquid temperature is 15~30 DEG C；Institute
It includes spraying, surface drying and solidification, baking to state face and apply process, and neodymium iron boron magnetic body positive and negative carries out above-mentioned face and applies process successively.
Further scheme, the face apply process, and magnet front is identical as reverse side；The technological parameter of the spraying is spray oil
15~30ml/min is measured, 0.4~0.6MPa of governor pressure, 0.2~0.26MPa of atomizing pressure are sprayed；The surface drying is with solidification temperature
100~130 DEG C, the time is 2~10min；The baking, baking temperature be 180~220 DEG C, baking time be 20~
50min。
The coating layer thickness of further scheme, the ZnAl coatings and richness Al coatings is 6~20 μm.
ZnAl coatings are applied as primary coat and richness Al coatings as face and are combined by the present invention, by twice spray treatment, are had
Effect reduces the porosity between magnet and corrosive medium, improves the binding force between coating and magnet, makes sintered NdFeB
Magnet has good corrosion resistance；The ZnAl coatings of primary coat are prevented since aluminium particle constitutes mesh skeleton between mixed coating
The accumulation and loss of corrosion product prior to the Zn of Al corrosion, in turn the corrosion product of Zn is in the netted framework of Al
Aperture clogs, and the oxide of Al is dense, therefore, makes to greatly reduce into the deeper medium of coating, to
Magnet high temperature resistance high pressure and ageing resistance is greatly improved；Neodymium iron boron magnetic body is impregnated using pretreatment liquid simultaneously, it can be notable
Extend the corrosion-resistant time of magnet；Compared to common plating Zn coatings and sputtering Al coating process, avoid in electroplating process
Point effect, as a result of the technological means of spraying, there is no the applications of the use and electric current of plating solution, and therefore, coating is not easy
Hydrogen embrittlement occurs.Meanwhile entire spraying process carries out in ten thousand grades of dust-free workshops, ensure that sample surfaces cleanliness factor；In neutral salt
It is tested 1000 hours or more in mist, magnet is corrosion-free.
Specific implementation mode
Illustrate present disclosure with reference to specific embodiment and reference examples.
Embodiment 1
A. it is 38SH to select performance, and specification is the sintered NdFeB black-film of (6.85+8) × 12 × 2.1；
The angles the R control for vibrating chamfering is 0.1mm, carries out alkali cleaning oil removing, pickling 80s is to remove it in 3% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 3min by oxide on surface；
B. the neodymium iron boron black-film after ultrasound is washed, is placed in by distilled water, YL-701 nanometers of non-phosphate film agents and YL-702
Accelerator by volume 1000:40:2min is impregnated in the pretreatment liquid of 8 configurations.
C. by the sintered NdFeB black-film after pretreatment liquid impregnates, prebake conditions processing is carried out, prebake conditions temperature is 60 DEG C,
The prebake conditions time is 2min；
D. by the sintered NdFeB black-film primary coat ZnAl masking liquids after prebake conditions.It is 26s, masking liquid temperature that the ZnAl, which applies fluid viscosity,
Degree is 15 DEG C, and spraying oil mass is 15ml/min, and spray governor pressure is 0.4MPa, atomizing pressure 0.2MPa.Spray sintering neodymium first
The front of iron boron black-film will spray positive sintered NdFeB black-film by drying tunnel surface drying and cure, surface drying and solidification temperature
It is 100 DEG C, time 2min, is then placed in oven cooking cycle, oven cooking cycle temperature is 100 DEG C, baking time 20min；It will sintering
Near the baking of neodymium iron boron black-film front is finished and is cooled to room temperature, i.e. sintered NdFeB black-film front primary coat ZnAl masking liquids finish.
Subsequent turn-over spray sintering neodymium iron boron black-film reverse side also passes through the surface drying solidification of drying tunnel, surface drying and solidification temperature after spraying
Degree is 100 DEG C, time 2min, and sintered NdFeB black-film is then put into oven cooking cycle, and oven cooking cycle temperature is 210 DEG C, is dried
The roasting time is 20min, and baking, which finishes, is cooled to room temperature sintered NdFeB black-film to get the sintering neodymium iron that primary coat is ZnAl coatings
Boron black-film.
E. richness Al masking liquids will be applied through treated sintered NdFeB black-film face.The viscosity of the richness Al masking liquids is 28s,
Masking liquid temperature is 15 DEG C, and spraying oil mass is 15ml/min, sprays governor pressure 0.4MPa, atomizing pressure 0.2MPa.First at spraying
The front of sintered NdFeB black-film after reason will spray positive magnet by drying tunnel surface drying and cure, surface drying and solidification temperature
Degree is 100 DEG C, time 2min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 180 DEG C, baking time 20min；It will
The baking of magnet front is finished and is cooled to room temperature near rear, i.e., magnet front face applies richness Al masking liquids and finishes.Subsequent turn-over face applies magnetic
Body reverse side, magnet reverse side face painting process applies process with positive face and technological parameter is identical, and rich Al is painted with up to face after cooling
The sintered NdFeB black-film of coating.
It is ZnAl coatings by primary coat, the neutral salt spray test for the magnet progress 1024 hours that face is painted with rich Al coatings (is tested
Box temperature degree is 35 DEG C, and brine strength volume ratio is 5%, using the test method continuously sprayed), magnet is corrosion-free；By above-mentioned magnetic
It is intact that body product is placed in ageing oven (condition is 130 DEG C, 2.7atm, 120%RH) 168 hours surfaces；With knife above-mentioned
After the scribing line of magnet product coating surface, there is not peeling and fall off, 3M is adhesive in coating surface, pulls 3M gel coatings and has kept
It is good.
Reference examples 1
A. it is 38SH to select performance, and specification is the sintered NdFeB black-film of (6.85+8) × 12 × 2.1；
The angles the R control for vibrating chamfering is 0.1mm, carries out alkali cleaning oil removing, pickling 80s is to remove it in 3% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 3min by oxide on surface；
B. the sintered NdFeB black-film after distilled water is cleaned by ultrasonic is impregnated without pretreatment liquid, is directly carried out at prebake conditions
Reason, prebake conditions temperature 60 C, prebake conditions time are 2min；.
C. it will pass through prebake conditions treated Sintered NdFeB magnet and carry out primary coat knead dough painting processing, the mistake that primary coat knead dough applies
Journey and technological parameter are identical with step d, e in embodiment 1, and after primary coat knead dough applies, magnet is cooled down.It will cool down
(chamber temperature is 35 DEG C to the neutral salt spray test of magnet progress 1024 hours afterwards, and brine strength volume ratio is 5%, is used
The test method continuously sprayed), there is rust spot in magnet；Magnet after cooling is placed in ageing oven (condition is 130 DEG C,
2.7atm, 120%RH) just there is rust staining in surface 96 hours；After being crossed on above-mentioned magnet product coating surface with knife, coating
There is peeling, 3M is adhesive in coating surface, pulls 3M gel coatings and fall off with adhesive tape.
Embodiment 2
A. it is 42SH to select performance, and specification is the sintered NdFeB black-film of (5.81+7.2) × 33.5 × 2.2；
The angles the R control for vibrating chamfering is 0.6mm, carries out alkali cleaning oil removing, pickling 60s is to remove it in 4% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 2min by oxide on surface；
B. the neodymium iron boron black-film after ultrasound is washed, is placed in by distilled water, YL-701 nanometers of non-phosphate film agents and YL-702
Accelerator by volume 1200:60:3min is impregnated in the pretreatment liquid of 15 configurations.
C. by the sintered NdFeB black-film after pretreatment liquid impregnates, prebake conditions processing is carried out, prebake conditions temperature is 70 DEG C,
The prebake conditions time is 3min；
D. by the sintered NdFeB black-film primary coat ZnAl masking liquids after prebake conditions.It is 28s, masking liquid temperature that the ZnAl, which applies fluid viscosity,
Degree is 20 DEG C, and spraying oil mass is 20ml/min, and spray governor pressure is 0.48MPa, atomizing pressure 0.22MPa.Spray sintering first
The front of neodymium iron boron black-film will spray positive sintered NdFeB black-film by drying tunnel surface drying and cure, surface drying and solidification temperature
Degree is 110 DEG C, time 5min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 120 DEG C, baking time 30min；It will burn
Near the baking of knot neodymium iron boron black-film front is finished and is cooled to room temperature, i.e. sintered NdFeB black-film front primary coat ZnAl masking liquids are complete
Finish.Subsequent turn-over spray sintering neodymium iron boron black-film reverse side also passes through the surface drying solidification of drying tunnel, surface drying and solidification after spraying
Temperature is 110 DEG C, time 5min, and sintered NdFeB black-film is then put into oven cooking cycle, and oven cooking cycle temperature is 220 DEG C,
Baking time is 30min, and baking, which finishes, is cooled to room temperature sintered NdFeB black-film to get the sintering neodymium that primary coat is ZnAl coatings
Iron boron black-film.
E. richness Al masking liquids will be applied through treated sintered NdFeB black-film face.The viscosity of the richness Al masking liquids is 31s,
Masking liquid temperature is 20 DEG C, and spraying oil mass is 20ml/min, sprays governor pressure 0.48MPa, atomizing pressure 0.22MPa.It sprays first
The front of treated sintered NdFeB black-film, will spray positive magnet by drying tunnel surface drying and solidification, surface drying and solidification
Temperature is 110 DEG C, time 5min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 200 DEG C, baking time 30min；
Near after the baking of magnet front is finished and is cooled to room temperature, i.e., magnet front face applies richness Al masking liquids and finishes.Subsequent turn-over face applies
Magnet reverse side, magnet reverse side face painting process applies process with positive face and technological parameter is identical, and richness is painted with up to face after cooling
The sintered NdFeB black-film of Al coatings.
It is ZnAl coatings by primary coat, the neutral salt spray test for the magnet progress 1024 hours that face is painted with rich Al coatings (is tested
Box temperature degree is 35 DEG C, and brine strength volume ratio is 5%, using the test method continuously sprayed), magnet is corrosion-free；By above-mentioned magnetic
It is intact that body product is placed in ageing oven (condition is 130 DEG C, 2.7atm, 120%RH) 168 hours surfaces；With knife above-mentioned
After the scribing line of magnet product coating surface, there is not peeling and fall off, 3M is adhesive in coating surface, pulls 3M gel coatings and has kept
It is good.
Reference examples 2
Selection performance is 42SH, and specification is the sintered NdFeB black-film of (5.81+7.2) × 33.5 × 2.2；
The angles the R control for vibrating chamfering is 0.6mm, carries out alkali cleaning oil removing, pickling 60s is to remove it in 4% dust technology
Magnet after pickling is immersed in 3% citric acid solution and is activated by oxide on surface, and the magnet after activation is then placed in plating Zn slots
Middle plating Zn, wherein electroplate liquid each component and concentration of component are respectively for potassium chloride 220g/L, zinc chloride 70g/L, boric acid 30g/
L, electroplate liquid pH are 4.8, and temperature of electroplating solution is 35 DEG C, current density 1A/dm2, electroplating time 30min.
By above-mentioned plating Zn layers of neodymium iron boron magnetic body carry out 100 hours neutral salt spray test (chamber temperature be 35 DEG C,
Brine strength volume ratio is 5%, using the test method continuously sprayed), there is rust staining in magnet surface；By above-mentioned plating Zn layers
After magnet is placed in ageing oven (condition is 130 DEG C, 2.7atm, 120%RH) holding 24 hours, magnet surface occurs a large amount of
Rust staining.
Embodiment 3
A. it is 45UH, the sintered NdFeB black-film that specification is 24.7 × 6.3 × 5 to select performance；
The angles the R control for vibrating chamfering is 0.4mm, carries out alkali cleaning oil removing, pickling 50s is to remove it in 5% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 100s by oxide on surface；
B. the neodymium iron boron black-film after ultrasound is washed, is placed in by distilled water, YL-701 nanometers of non-phosphate film agents and YL-702
Accelerator by volume 800:50:4min is impregnated in the pretreatment liquid of 5 configurations.
C. by the sintered NdFeB black-film after pretreatment liquid impregnates, prebake conditions processing is carried out, prebake conditions temperature is 80 DEG C,
The prebake conditions time is 4min；
D. by the sintered NdFeB black-film primary coat ZnAl masking liquids after prebake conditions.It is 32s, masking liquid temperature that the ZnAl, which applies fluid viscosity,
Degree is 25 DEG C, and spraying oil mass is 25ml/min, and spray governor pressure is 0.54MPa, atomizing pressure 0.24MPa.Spray sintering first
The front of neodymium iron boron black-film will spray positive sintered NdFeB black-film by drying tunnel surface drying and cure, surface drying and solidification temperature
Degree is 120 DEG C, time 8min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 130 DEG C, baking time 40min；It will burn
Near the baking of knot neodymium iron boron black-film front is finished and is cooled to room temperature, i.e. sintered NdFeB black-film front primary coat ZnAl masking liquids are complete
Finish.Subsequent turn-over spray sintering neodymium iron boron black-film reverse side also passes through the surface drying solidification of drying tunnel, surface drying and solidification after spraying
Temperature is 120 DEG C, time 8min, and sintered NdFeB black-film is then put into oven cooking cycle, and oven cooking cycle temperature is 230 DEG C,
Baking time is 40min, and baking, which finishes, is cooled to room temperature sintered NdFeB black-film to get the sintering neodymium that primary coat is ZnAl coatings
Iron boron black-film.
E. richness Al masking liquids will be applied through treated sintered NdFeB black-film face.The viscosity of the richness Al masking liquids is 34s,
Masking liquid temperature is 25 DEG C, and spraying oil mass is 25ml/min, sprays governor pressure 0.54MPa, atomizing pressure 0.24MPa.It sprays first
The front of treated sintered NdFeB black-film, will spray positive magnet by drying tunnel surface drying and solidification, surface drying and solidification
Temperature is 120 DEG C, time 8min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 210 DEG C, baking time 40min；
Near after the baking of magnet front is finished and is cooled to room temperature, i.e., magnet front face applies richness Al masking liquids and finishes.Subsequent turn-over face applies
Magnet reverse side, magnet reverse side face painting process applies process with positive face and technological parameter is identical, and richness is painted with up to face after cooling
The sintered NdFeB black-film of Al coatings.
It is ZnAl coatings by primary coat, the neutral salt spray test for the magnet progress 1024 hours that face is painted with rich Al coatings (is tested
Box temperature degree is 35 DEG C, and brine strength volume ratio is 5%, using the test method continuously sprayed), magnet is corrosion-free；By above-mentioned magnetic
It is intact (condition is 130 DEG C, 2.7atm, 120%RH) that body product is placed in 168 hours surfaces in ageing oven；With knife above-mentioned
After the scribing line of magnet product coating surface, there is not peeling and fall off, 3M is adhesive in coating surface, pulls 3M gel coatings and has kept
It is good.
Reference examples 3
Selection performance is 45UH, the sintered NdFeB black-film that specification is 24.7 × 6.3 × 5；
The angles the R control for vibrating chamfering is 0.4mm, carries out alkali cleaning oil removing, pickling 50s is to remove it in 5% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 100s by oxide on surface；Using Chinese patent
Physical vapor method in document CN105671503A, the magnet surface after ultrasound is washed deposit to obtain composite coating.
By the neutral salt spray test of the magnet progress 1024 hours of above-mentioned composite coating, (chamber temperature is 35 DEG C, brine
Concentration volume ratio is 5%, using the test method continuously sprayed), there is rust staining in magnet surface；By the magnet of above-mentioned composite coating
After being placed in ageing oven (condition is 130 DEG C, 2.7atm, 120%RH) holding 168 hours, there is rust spot in magnet surface.
Embodiment 4
A. it is 38H to select performance, and specification isSintered NdFeB black-film；
The angles the R control for vibrating chamfering is 0.2mm, carries out alkali cleaning oil removing, pickling 40s is to remove it in 6% dust technology
Then sintered NdFeB black-film after pickling is put into distilled water and is cleaned by ultrasonic 1min by oxide on surface；
B. the neodymium iron boron black-film after ultrasound is washed, is placed in by distilled water, YL-701 nanometers of non-phosphate film agents and YL-702
Accelerator by volume 1100:40:5min is impregnated in the pretreatment liquid of 10 configurations.
C. by the sintered NdFeB black-film after pretreatment liquid impregnates, prebake conditions processing is carried out, prebake conditions temperature is 90 DEG C,
The prebake conditions time is 5min；
D. by the sintered NdFeB black-film primary coat ZnAl masking liquids after prebake conditions.It is 34s, masking liquid temperature that the ZnAl, which applies fluid viscosity,
Degree is 30 DEG C, and spraying oil mass is 30ml/min, and spray governor pressure is 0.60MPa, atomizing pressure 0.26MPa.Spray sintering first
The front of neodymium iron boron black-film will spray positive sintered NdFeB black-film by drying tunnel surface drying and cure, surface drying and solidification temperature
Degree is 130 DEG C, time 10min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 140 DEG C, baking time 50min；It will burn
Near the baking of knot neodymium iron boron black-film front is finished and is cooled to room temperature, i.e. sintered NdFeB black-film front primary coat ZnAl masking liquids are complete
Finish.Subsequent turn-over spray sintering neodymium iron boron black-film reverse side also passes through the surface drying solidification of drying tunnel, surface drying and solidification after spraying
Temperature is 130 DEG C, time 10min, and sintered NdFeB black-film is then put into oven cooking cycle, and oven cooking cycle temperature is 240 DEG C,
Baking time is 50min, and baking, which finishes, is cooled to room temperature sintered NdFeB black-film to get the sintering neodymium that primary coat is ZnAl coatings
Iron boron black-film.
E. richness Al masking liquids will be applied through treated sintered NdFeB black-film face.The viscosity of the richness Al masking liquids is 38s,
Masking liquid temperature is 30 DEG C, and spraying oil mass is 30ml/min, sprays governor pressure 0.60MPa, atomizing pressure 0.26MPa.It sprays first
The front of treated sintered NdFeB black-film, will spray positive magnet by drying tunnel surface drying and solidification, surface drying and solidification
Temperature is 130 DEG C, time 10min, is then placed in oven cooking cycle, and oven cooking cycle temperature is 220 DEG C, baking time 50min；
Near after the baking of magnet front is finished and is cooled to room temperature, i.e., magnet front face applies richness Al masking liquids and finishes.Subsequent turn-over face applies
Magnet reverse side, magnet reverse side face painting process applies process with positive face and technological parameter is identical, and richness is painted with up to face after cooling
The sintered NdFeB black-film of Al coatings.
It is ZnAl coatings by primary coat, the neutral salt spray test for the magnet progress 1024 hours that face is painted with rich Al coatings (is tested
Box temperature degree is 35 DEG C, and brine strength volume ratio is 5%, using the test method continuously sprayed), magnet is corrosion-free；By above-mentioned magnetic
It is intact that body product is placed in ageing oven (condition is 130 DEG C, 2.7atm, 120%RH) 168 hours surfaces；With knife above-mentioned
After the scribing line of magnet product coating surface, there is not peeling and fall off, 3M is adhesive in coating surface, pulls 3M gel coatings and has kept
It is good.
Reference examples 4
Selection performance is 38H, and specification isThe sintered NdFeB black-film for not carrying out any surfacecti proteon, by magnetic
(chamber temperature is 35 DEG C to the neutral salt spray test of body progress 1 hour, and brine strength volume ratio is 5%, using what is continuously sprayed
Test method), there is rust spot in magnet；Above-mentioned magnet product is placed in ageing oven (condition is 130 DEG C, 2.7atm,
120%RH) 1 hour, there is rust staining in magnet surface.
Above content is only to examples of the invention and explanation, affiliated those skilled in the art are to being retouched
The various modifications or additions or substitute by a similar method that the specific embodiment stated is made, without departing from the present invention
Design or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (10)
1. a kind of preparation method of Sintered NdFeB magnet surface high-corrosion-resistance coating, include by the neodymium iron boron magnetic body of machine-shaping into
Row pretreatment, it is characterised in that：It is further comprising the steps of：
A. it impregnates：Pretreated neodymium iron boron product is immersed in pretreatment liquid, the pretreatment liquid is by distilled water, film agent
It is formed with accelerator mixed preparing；
B. primary coat：By the neodymium iron boron magnetic body surface of ZnAl masking liquids primary coat after steeping, the neodymium iron boron for being primed with ZnAl coatings is obtained
Magnet；
C. face applies：Rich Al painting liquid levels are coated in and obtain high anti-corrosion neodymium-iron-boron through treated the neodymium iron boron magnetic body surfaces step b
Body.
2. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：The step
Rapid further includes pre-firing process between a and step b, and in the pre-firing process, prebake conditions temperature is 60 ~ 90 DEG C, when prebake conditions
Between be 2 ~ 5min.
3. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：It is described pre-
Processing is that the neodymium iron boron magnetic body of machine-shaping is carried out chamfering, alkali cleaning, pickling and washing process successively；
The chamfered, it is 0.1 ~ 0.6mm to make the angles R of chamfering；
Neodymium iron boron magnetic body is fitted into be placed in lye in mesh bag by the alkali cleaning to be impregnated, added with surfactant in the lye；
The nitric acid for the pickle a concentration of 3% ~ 6% that the pickling uses, pickling time are 40 ~ 80s；
Neodymium iron boron magnetic body after pickling is placed in distilled water by the washing to be cleaned by ultrasonic, and scavenging period is 1 ~ 3min.
4. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 3, it is characterised in that：The table
Face activating agent is OP emulsifiers.
5. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：The skin
Film is YL-701 nanometers of non-phosphate film agents, and the accelerator is YL-702 accelerators；Distilled water, YL- in the pretreatment liquid
The volume ratio of 701 nanometers of non-phosphate film agents and YL-702 accelerators is 800 ~ 1200:40~60:5 ~ 15, neodymium iron boron magnetic body is in Qian Chu
It is 2 ~ 5min to manage soaking time in liquid.
6. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：The bottom
It is 26 ~ 34s to apply the ZnAl used and apply fluid viscosity, and masking liquid temperature is 15 ~ 30 DEG C；The primary coat process includes spraying, surface drying and consolidates
Change, baking, neodymium iron boron magnetic body positive and negative carries out above-mentioned primary coat process successively.
7. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 6, it is characterised in that：The spray
The technological parameter of painting is spraying 15 ~ 30ml/min of oil mass, sprays 0.4 ~ 0.6MPa of governor pressure, 0.2 ~ 0.26MPa of atomizing pressure；It is described
Surface drying is 100 ~ 130 DEG C with solidification temperature, and the time is 2 ~ 10min；The baking, magnet front baking temperature are 100 ~ 140 DEG C,
Baking time is 20 ~ 50min；Magnet reverse side baking temperature is 210 ~ 240 DEG C, and baking time is 20 ~ 50min.
8. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：The face
It is 28 ~ 38s to apply the rich Al used and apply fluid viscosity, and masking liquid temperature is 15 ~ 30 DEG C；The face apply process include spraying, surface drying with it is solid
Change, baking, neodymium iron boron magnetic body positive and negative carries out above-mentioned face and applies process successively.
9. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 8, it is characterised in that：The face
Painting process, magnet front are identical as reverse side；The technological parameter of the spraying is spraying 15 ~ 30ml/min of oil mass, sprays governor pressure 0.4
~ 0.6MPa, 0.2 ~ 0.26MPa of atomizing pressure；The surface drying is 100 ~ 130 DEG C with solidification temperature, and the time is 2 ~ 10min；It is described
Baking, baking temperature are 180 ~ 220 DEG C, and baking time is 20 ~ 50min.
10. the preparation method of neodymium iron boron magnetic body surface high-corrosion-resistance coating according to claim 1, it is characterised in that：It is described
The coating layer thickness of ZnAl coatings and richness Al coatings is 6 ~ 20 μm.
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| CN111799052A (en) * | 2020-06-29 | 2020-10-20 | 浙江中杭新材料科技有限公司 | Sintered neodymium iron boron magnet with surface function rete |
| CN112439675A (en) * | 2019-09-04 | 2021-03-05 | 沈阳新铭天合金材料有限公司 | Rare earth magnetic anti-corrosion spraying process |
| CN113555208A (en) * | 2021-06-11 | 2021-10-26 | 杭州电子科技大学 | Surface treatment method of sintered neodymium-iron-boron magnet and sintered neodymium-iron-boron magnet |
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