CN113999588A - Sintered NdFeB magnet surface corrosion-resistant composite coating and preparation method thereof - Google Patents

Sintered NdFeB magnet surface corrosion-resistant composite coating and preparation method thereof Download PDF

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CN113999588A
CN113999588A CN202111267462.6A CN202111267462A CN113999588A CN 113999588 A CN113999588 A CN 113999588A CN 202111267462 A CN202111267462 A CN 202111267462A CN 113999588 A CN113999588 A CN 113999588A
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sintered ndfeb
composite coating
ndfeb magnet
bdc
solution
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崔接武
张金华
吴玉程
张鹏杰
余东波
曹玉杰
徐光青
孙威
李炳山
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Beikuang Magnets Fuyang Co ltd
Hefei University of Technology
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Beikuang Magnets Fuyang Co ltd
Hefei University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

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Abstract

The invention provides a sintered NdFeB magnet surface corrosion-resistant coating and a preparation method thereof, and the method mainly comprises the following steps: the preparation method comprises the steps of preparation of a Co-BDC nanosheet, magnet surface pretreatment, preparation of a composite coating and high-temperature curing. The composite coating prepared by the invention takes the Co-BDC nanosheets as a reinforcing material, and the porosity between a magnet and a corrosive medium is reduced and the compactness of the coating is improved by changing the addition amount of the Co-BDC nanosheets, so that the corrosion resistance of the coating is effectively improved. The corrosion-resistant coating prepared by the preparation method does not influence the inherent performance of the magnet, has uniform and controllable thickness, and can provide longer corrosion protection effect for the sintered NdFeB magnet.

Description

Sintered NdFeB magnet surface corrosion-resistant composite coating and preparation method thereof
Technical Field
The invention relates to the field of surface protection of magnetic materials, in particular to a sintered NdFeB magnet surface corrosion-resistant composite coating and a preparation method thereof.
Background
Compared with other permanent magnet materials, the sintered Nd-Fe-B magnet has outstanding magnetic performance advantages, extremely high magnetic energy product, coercive force and energy density, is called as 'King' and has good mechanical performance and easy processing. These excellent properties make sintered nd-fe-b permanent magnets widely used in modern industry and electronics, and more commonly, permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment, etc. However, the sintered NdFeB magnet prepared by the powder metallurgy process has a loose and porous surface and a multi-phase structure, and the potential difference between phases is large, so that the sintered NdFeB magnet is very easy to corrode in an electrochemical environment, and the further expansion of the application field of the sintered NdFeB magnet is limited. At present, methods for improving the corrosion resistance of the sintered neodymium-iron-boron magnet mainly comprise an alloying method and a surface protective coating. The alloying method generally improves the corrosion resistance of the magnet at the expense of the performance of the magnet, and the range of improving the corrosion resistance of the magnet is limited. Therefore, the surface protection method is mainly adopted to coat the protective coating on the surface of the magnet in the industrial production at present, and the corrosion resistance of the magnet can be obviously improved. Therefore, the development of the sintered neodymium iron boron magnet surface corrosion-resistant coating and the preparation method thereof have important economic and social benefits.
Disclosure of Invention
The invention aims to provide a sintered NdFeB magnet surface corrosion-resistant composite coating and a preparation method thereof, which improve the corrosion resistance of the sintered NdFeB magnet, prolong the service life of the sintered NdFeB magnet, have uniform and controllable coating thickness and do not influence the inherent performance of the magnet.
In order to achieve the purpose, the invention provides the following technical scheme:
the composite coating is a Co-BDC/epoxy resin composite coating, and is prepared from Co-BDC nanosheets and epoxy resin.
Preferably, the preparation method of the sintered NdFeB magnet surface corrosion-resistant composite coating comprises the following steps:
(1) preparing a Co-BDC nanosheet;
(2) pretreating a sintered NdFeB magnet;
(3) preparing the corrosion-resistant composite coating:
(4) the sintered NdFeB magnet was subjected to high temperature curing.
Preferably, the specific process of the step (1) is that an appropriate amount of ethanol and water are added into N, N-dimethylformamide, and the mixture is mixed to form a solution A, wherein the amount of N, N-dimethylformamide is 25-35mL, the amount of ethanol is 1-3mL, and the amount of water is 1-3mL, terephthalic acid is dissolved in the solution A to form a solution B, the mass of the terephthalic acid is 120-130mg, cobalt chloride hexahydrate is dissolved in the solution B to form a solution C, the mass of the cobalt chloride hexahydrate is 180-185mg, 0.5-1mL of triethylamine is rapidly added into the solution C, magnetic stirring is carried out, the solution C is subjected to continuous ultrasonic treatment for 6-10h, the product is centrifuged, and after being cleaned by ethanol, the product is placed in an oven to be dried to obtain the Co-BDC nanosheet.
Preferably, the specific process of the step (2) is that firstly, the sintered NdFeB magnet is pickled in 2-6 wt% nitric acid solution for 10-30s, then the magnet is sequentially treated with ultrasonic in deionized water and ethanol for 30-90s, and finally the magnet is dried by cold air for standby.
Preferably, the specific process of step (3) is as follows, dispersing the obtained Co-BDC nanosheets in an epoxy resin mixed solution, and placing the pretreated sintered NdFeB magnet on a spin coater for surface coating.
Preferably, the dispersion concentration of the Co-BDC nanosheets is 20-80g/L, and the epoxy resin mixed solution is one or more than two of epoxy resin, acrylic acid, isopropanol and ethanol.
Preferably, the rotation speed of the spin coating is 1000-.
Preferably, the specific process of the step (4) is that the sintered NdFeB magnet treated in the step (3) is air-dried and then cured at a high temperature, and finally the composite coating is prepared on the surface of the magnet.
Preferably, the temperature of the curing process is 80-180 ℃, and the curing time is 100-.
Compared with the prior art, the invention has the beneficial effects that:
the composite coating prepared by the invention takes the Co-BDC nanosheets as a reinforcing material, and the porosity between a magnet and a corrosive medium is reduced and the compactness of the coating is improved by changing the addition amount of the Co-BDC nanosheets, so that the corrosion resistance of the coating is effectively improved. The service life of the sintered NdFeB magnet is prolonged, the thickness of the coating is uniform and controllable, and the inherent performance of the magnet is not influenced.
Drawings
FIG. 1 is a FESEM photograph of Co-BDC nanoplates of the present invention;
FIG. 2 is a FESEM photograph of a cross section of a Co-BDC nanosheet/epoxy composite coating obtained in example 1 of the present invention;
FIG. 3 is a FESEM photograph showing a cross section of an epoxy resin coating layer obtained in comparative example 1 of the present invention;
FIG. 4 is an XRD diffraction pattern of NdFeB magnet, epoxy resin coating NdFeB substrate, Co-BDC nanosheet/epoxy resin composite coating NdFeB substrate in the present invention;
fig. 5 is a graph of electrochemical ac impedance test Bode for sintered NdFeB magnets prepared in examples 1 to 3 and comparative example 1 in accordance with the present invention;
fig. 6 is a polarization diagram of sintered NdFeB magnets and bare-sintered NdFeB magnets prepared in examples 1 to 3 and comparative example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a preparation method of a sintered NdFeB magnet surface corrosion-resistant composite coating comprises the following steps:
(1) preparing a Co-BDC nanosheet;
adding 32ml of N, N-dimethylformamide into 2ml of ethanol and 2ml of water, mixing to form a solution A, dissolving 125.9mg of terephthalic acid in the solution A to form a solution B, dissolving 180.2mg of cobalt chloride hexahydrate in the solution B to form a solution C, quickly adding 0.8ml of triethylamine into the solution C, magnetically stirring for 5min, continuously carrying out ultrasonic treatment on the solution C for 8h, carrying out centrifugal separation on a product, washing with ethanol, and drying in an oven to obtain a Co-BDC nanosheet;
(2) pretreating a sintered NdFeB magnet;
firstly, pickling a sintered NdFeB magnet in a 3 wt% nitric acid solution for 20 s; then, the magnet is sequentially subjected to ultrasonic treatment in deionized water and ethanol for 60s, and finally, the magnet is dried by cold air for standby.
(3) Preparing the corrosion-resistant composite coating:
dispersing the obtained Co-BDC nanosheets into epoxy resin mixed liquor, wherein the epoxy resin mixed liquor is mixed liquor of epoxy resin and ethanol, and the mass ratio of the epoxy resin to the ethanol is 1: the dispersion concentration of the Co-BDC nanosheets is 50 g/L. Preparing a Co-BDC/epoxy resin composite coating on the surface of the sintered NdFeB magnet treated in the step (2) by adopting a spin coating method, wherein the spin coating parameters are as follows: the rotation speed was 2000rpm and the time was 1 min.
(4) And (3) carrying out high-temperature curing on the sintered NdFeB magnet:
and (3) curing the coated magnet at a high temperature of 140 ℃ for 180 min.
Comparative example 1:
for comparison with example 1, the magnet pretreatment, spin coating parameters, and high temperature curing parameters of comparative example 1 were the same as those of example 1, and the comparative example was a sintered NdFeB magnet with an epoxy resin coating layer applied on the surface, and was prepared as follows:
(1) pretreating a sintered NdFeB magnet;
firstly, pickling a sintered NdFeB magnet in a 3 wt% nitric acid solution for 20 s; then, the magnet is sequentially subjected to ultrasonic treatment in deionized water and ethanol for 60s, and finally, the magnet is dried by cold air for standby.
(2) Preparation of the corrosion-resistant coating:
preparing an epoxy resin coating on the surface of the sintered NdFeB magnet treated in the step (1) by adopting a spin-coating method, wherein the epoxy resin coating is a mixed solution of epoxy resin and ethanol, and the mass ratio of the epoxy resin to the ethanol is 1: 2, spin coating parameters: the rotation speed was 2000rpm and the time was 1 min.
(3) And (3) carrying out high-temperature curing on the sintered NdFeB magnet:
and (3) curing the coated magnet at a high temperature of 140 ℃ for 180 min.
After the sintered NdFeB magnet with the epoxy resin coating on the surface, prepared in the control group 1, is soaked in 3.5 wt% NaCl solution for 5 days, the low-frequency impedance (| Z |0.01Hz) is 7.13X 10 through the electrochemical impedance spectrum test4Ω·cm-2. After 30 days of soaking, the corrosion potential is-0.762V and the self-corrosion current density is 2.368 multiplied by 10 through the test of an electrochemical polarization curve-5A·cm-2。
The sintered NdFeB magnet having a surface coated with a composite coating layer prepared in example 1 was immersed in a 3.5 wt% NaCl solution for 5 days, and then electrically chargedChemical impedance spectrum test shows that the low-frequency impedance (| Z |0.01Hz) is 5.08 multiplied by 108Ω·cm-2And is four orders of magnitude higher than that of the control group 1. After 30 days of soaking, the corrosion potential is-0.227V and the self-corrosion current density is 1.088 multiplied by 10 through the test of an electrochemical polarization curve-11A·cm-2And six orders of magnitude lower than that of control 1.
Example 2:
the preparation method of the embodiment is the same as that of embodiment 1, except that the dispersion concentration of the Co-BDC nanosheets in the composite coating is 25 g/L.
After the sintered NdFeB magnet with the surface coated with the composite coating prepared in example 2 is soaked in 3.5 wt% NaCl solution for 5 days, the sintered NdFeB magnet surface corrosion-resistant composite coating obtained according to the above steps has a low-frequency impedance (| Z |0.01Hz) of 1.19 × 10 by electrochemical impedance spectroscopy test8Ω·cm-2And is four orders of magnitude higher than that of the control group 1. After 30 days of soaking, the corrosion potential is-0.382V and the self-corrosion current density is 7.639 multiplied by 10 according to the test of electrochemical polarization curve-9A·cm-2And is reduced by four orders of magnitude compared with the control group 1.
Example 3:
the preparation method of the embodiment is the same as that of embodiment 1, except that the dispersion concentration of the Co-BDC nanosheets in the composite coating is 75 g/L.
After the sintered NdFeB magnet with the surface coated with the composite coating prepared in example 3 was immersed in 3.5 wt% NaCl solution for 5 days, the sintered NdFeB magnet surface corrosion-resistant composite coating obtained according to the above procedure was tested by electrochemical impedance spectroscopy, and its low frequency impedance (| Z |0.01Hz) was 8.92 × 107Ω·cm-2And is increased by three orders of magnitude compared with the control group 1. After 30 days of soaking, the corrosion potential is-0.677V and the self-corrosion current density is 8.772 multiplied by 10 according to the test of an electrochemical polarization curve-7A·cm-2And is reduced by two orders of magnitude compared with the control group 1.
FIG. 1 is an FESEM photograph of a Co-BDC nanosheet of the present invention, the nanosheet is relatively thin, smooth in surface and has pores of different sizes, the whole is a three-dimensional network structure, and has an obvious spatial stereoscopic impression.
Fig. 2 is a cross-sectional FESEM photograph of the Co-BDC nanosheet/epoxy resin composite coating obtained in example 1 of the present invention, in which the thickness of the coating is about 20 μm, the coating is tightly bonded to the substrate, the Co-BDC nanosheets are uniformly embedded in the coating, and the compactness of the coating is increased.
FIG. 3 is an FESEM photograph of the cross section of the epoxy resin coating obtained from the control group 1 of the present invention, wherein the thickness of the coating is about 20 μm, the coating is tightly bonded with the substrate, and the surface of the coating is smooth and flat.
Fig. 4 is an XRD diffraction pattern of the NdFeB magnet, the epoxy resin coating layer coated NdFeB substrate, the Co-BDC nanosheet, and the Co-BDC nanosheet/epoxy resin composite coating layer coated NdFeB substrate of the present invention, fig. 4(a) is a diffraction peak of an XRD pattern of the NdFeB magnet, three strong peaks of the NdFeB magnet appear at 2 θ of 29.12 °, 38.13 °, and 44.39 °, fig. 4(d) is a diffraction peak of an XRD pattern of the Co-BDC nanosheet, and a diffraction peak of the Co-BDC magnet appears at 2 θ of 8.76 °, and as can be seen from fig. (nanosheet e), characteristic peaks of the NdFeB magnet and the Co-BDC nanosheet appear in the Co-BDC nanosheet/epoxy resin composite coating layer, respectively, which indicates that the composite coating layer contains the Co-BDC nanosheet.
Fig. 5 is a Bode diagram of electrochemical alternating current impedance test of the sintered NdFeB magnets prepared in examples 1 to 3 and comparative example 1 of the present invention, and it can be seen that when the dispersion concentration of the Co-BDC nanosheets is 50g/L, the coating has the highest impedance value and the highest corrosion resistance, but if the Co-BDC nanosheets are incorporated in an excessive amount, the corrosion resistance is reduced.
Fig. 6 is a polarization curve diagram of sintered NdFeB magnets and bare-sintered NdFeB magnets prepared in examples 1 to 3 and comparative example 1 of the present invention, and the self-corrosion potential of the polarization curve of the coated sample after 30 days of soaking was significantly higher than that of the polarization curve measured after 1 hour of soaking of the bare-sintered NdFeB magnets, indicating that the corrosion tendency of the coated sample was lower than that of the bare-sintered NdFeB magnets. And when the dispersion concentration of the Co-BDC nanosheets is 50g/L, the coating has the highest self-corrosion potential and the highest corrosion resistance.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.

Claims (9)

1. A sintered NdFeB magnet surface corrosion-resistant composite coating is characterized in that: the composite coating is a Co-BDC/epoxy resin composite coating, and is prepared from Co-BDC nanosheets and epoxy resin.
2. The preparation method of the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 1, comprising the following steps:
(1) preparing a Co-BDC nanosheet;
(2) pretreating a sintered NdFeB magnet;
(3) preparing the corrosion-resistant composite coating:
(4) the sintered NdFeB magnet was subjected to high temperature curing.
3. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 2, wherein the method comprises the following steps: adding a proper amount of ethanol and water into N, N-dimethylformamide, mixing to form a solution A, wherein the amount of N, N-dimethylformamide is 25-35mL, the amount of ethanol is 1-3mL, and the amount of water is 1-3mL, dissolving terephthalic acid in the solution A to form a solution B, the mass of the terephthalic acid is 120-130mg, dissolving cobalt chloride hexahydrate in the solution B to form a solution C, the mass of the cobalt chloride hexahydrate is 180-185mg, quickly adding 0.5-1mL of triethylamine into the solution C, performing magnetic stirring, continuously performing ultrasonic treatment on the solution C for 6-10h, centrifuging the product, cleaning with ethanol, and drying in an oven to obtain the Co-BDC nanosheets.
4. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 2, wherein the method comprises the following steps: the specific process of the step (2) is that firstly, the sintered NdFeB magnet is pickled in 2-6 wt% nitric acid solution for 10-30s, then the magnet is sequentially treated with ultrasonic in deionized water and ethanol for 30-90s, and finally the magnet is dried by cold air for standby.
5. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 2, wherein the method comprises the following steps: the specific process of the step (3) is that the obtained Co-BDC nanosheets are dispersed in the epoxy resin mixed solution, and the pretreated sintered NdFeB magnet is placed on a spin coater for surface coating.
6. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 5, wherein the method comprises the following steps: the dispersion concentration of the Co-BDC nanosheet is 20-80g/L, and the epoxy resin mixed solution is one or more than two of epoxy resin, acrylic acid, isopropanol and ethanol.
7. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 5, wherein the method comprises the following steps: the rotation speed of the spin coating is 1000-3000rpm, and the spin coating time is 30-90 s.
8. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 2, wherein the method comprises the following steps: and (4) specifically, air-drying the sintered NdFeB magnet treated in the step (3), then curing at a high temperature, and finally preparing the composite coating on the surface of the magnet.
9. The method for preparing the sintered NdFeB magnet surface corrosion-resistant composite coating according to claim 8, wherein the method comprises the following steps: the temperature in the curing process is 80-180 ℃, and the curing time is 100-200 min.
CN202111267462.6A 2021-10-29 2021-10-29 Sintered NdFeB magnet surface corrosion-resistant composite coating and preparation method thereof Pending CN113999588A (en)

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CN112521837A (en) * 2020-12-30 2021-03-19 四川轻化工大学 Filler of MOF (Metal organic framework) loaded corrosion inhibitor, self-repairing anticorrosive coating and preparation method of self-repairing anticorrosive coating
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* Cited by examiner, † Cited by third party
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US20100283568A1 (en) * 2006-03-21 2010-11-11 Vacuumschmelze Gmbh & Co, Kg Paint Composition, in Particular Anti-Corrosive Paint for Rare Earth Permanent Magnets
CN105648503A (en) * 2016-03-28 2016-06-08 钢铁研究总院 Method for preparing high-weather-resistance high-corrosion-resistance high-abrasion-resistance organic coating for surface of magnet
CN106245026A (en) * 2016-08-31 2016-12-21 安徽大地熊新材料股份有限公司 A kind of method preparing metal coating on Sintered NdFeB magnet surface
CN111808499A (en) * 2020-07-07 2020-10-23 安徽新大陆特种涂料有限责任公司 Organic framework modified epoxy resin scratch-resistant water-based paint
CN112521837A (en) * 2020-12-30 2021-03-19 四川轻化工大学 Filler of MOF (Metal organic framework) loaded corrosion inhibitor, self-repairing anticorrosive coating and preparation method of self-repairing anticorrosive coating
CN112920416A (en) * 2021-01-22 2021-06-08 大连理工大学 Preparation method of transition metal-based SURMAOFs based on liquid phase epitaxy method

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Application publication date: 20220201