CN112791924A - Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product - Google Patents

Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product Download PDF

Info

Publication number
CN112791924A
CN112791924A CN201911392747.5A CN201911392747A CN112791924A CN 112791924 A CN112791924 A CN 112791924A CN 201911392747 A CN201911392747 A CN 201911392747A CN 112791924 A CN112791924 A CN 112791924A
Authority
CN
China
Prior art keywords
permanent magnet
magnet material
iron boron
neodymium iron
boron permanent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911392747.5A
Other languages
Chinese (zh)
Inventor
刘再锋
宋俊杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Langfang Jingci Precision Material Co ltd
Original Assignee
Langfang Jingci Precision Material Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Langfang Jingci Precision Material Co ltd filed Critical Langfang Jingci Precision Material Co ltd
Priority to CN201911392747.5A priority Critical patent/CN112791924A/en
Publication of CN112791924A publication Critical patent/CN112791924A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/04—Electrophoretic coating characterised by the process with organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2518/00—Other type of polymers
    • B05D2518/10—Silicon-containing polymers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

The invention discloses a surface treatment method of a neodymium iron boron permanent magnet material and a permanent magnet material product, wherein the treatment method comprises the following steps: the method comprises the following steps that firstly, after the neodymium iron boron permanent magnet material is subjected to oil removal, rust removal and passivation treatment, a passivation film is formed on the surface of the neodymium iron boron permanent magnet material; step two, spraying a zinc-rich coating on the surface of the neodymium iron boron permanent magnet material with the passivation film, and forming a zinc-rich coating after curing; and step three, performing electrophoretic coating or spraying epoxy resin coating on the surface of the neodymium iron boron permanent magnet material with the passivation film and the zinc-rich coating, and curing to form an epoxy resin layer to obtain the surface-treated neodymium iron boron permanent magnet material. The corrosion resistance, acid and alkali resistance and adhesive force of the coating of the permanent magnet material product obtained by the invention are obviously improved, the service life of the neodymium iron boron permanent magnet material is prolonged, and the use requirement of the current severe environment is met.

Description

Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product
Technical Field
The invention relates to the technical field of surface treatment protection of neodymium iron boron permanent magnet materials. More specifically, the invention relates to a surface treatment method for a neodymium iron boron permanent magnet material and a permanent magnet material product.
Background
Neodymium iron boron (NdFeB) magnet as the third generation rare earth permanent magnet material has extremely high magnetic energy and coercive force and high cost performance, is widely applied to the fields of wind power, automobiles, information technology, motors and the like, and particularly has increasingly increased application in the field of environment-friendly new energy resources such as wind power generation, hybrid vehicles and the like. The neodymium iron boron powder metallurgy material is easy to corrode because on one hand, the chemical activity of element neodymium is high, and the element neodymium is easy to oxidize; on the other hand, the potential difference of electrodes among phases of the multiphase structure is large, and electrochemical corrosion is easy to occur. The performance of the rusted magnet is reduced, which affects the application, and therefore, it is an important subject to ensure high corrosion resistance in a severe environment.
In the prior art, the method for coating the corrosion-resistant layer on the surface of the neodymium iron boron magnet mainly comprises the following steps:
first, electroplating/electroless plating
The water plating method is to deposit a layer of zinc, nickel and copper on the surface of the neodymium iron boron magnet, the edge effect of the plating layer is large, the corrosion resistance is poor, and the plating solution contains heavy metal and organic additive and has serious environmental pollution.
Two-step plating-coating composite protection method
Zinc/nickel plating/vacuum aluminum plating and epoxy coating
The composite coating has high corrosion resistance, the neutral salt fog can reach 1600 hours, but the zinc and nickel electroplating solution has serious pollution to the environment. The vacuum aluminum plating method has the advantages of no pollution, small plating layer corner effect, poor adhesive force and corrosion resistance, special vacuum plating equipment, and high equipment price, thereby causing difficult popularization.
The neodymium iron boron permanent magnet material product is used in harsh environments such as offshore wind power generation, high-temperature desert and the like, and needs better corrosion resistance.
Disclosure of Invention
The invention aims to provide a surface treatment method for a neodymium iron boron permanent magnet material, which combines a sprayed zinc-rich coating and an epoxy resin coating and adds passivation treatment before spraying. The corrosion resistance, acid and alkali resistance and adhesive force of the plating layer are obviously improved, the service life of the neodymium iron boron permanent magnet material is prolonged, and the use requirement of the current severe environment is met.
The invention also aims to provide the neodymium iron boron permanent magnet material product prepared by the neodymium iron boron permanent magnet material surface treatment method, which has good corrosion resistance, acid and alkali resistance and long service life.
To achieve these objects and other advantages in accordance with the present invention, there is provided a surface treatment method for a nd-fe-b permanent magnetic material, comprising the steps of:
the method comprises the following steps that firstly, after the neodymium iron boron permanent magnet material is subjected to oil removal, rust removal and passivation treatment, a passivation film is formed on the surface of the neodymium iron boron permanent magnet material;
step two, spraying a zinc-rich coating on the surface of the neodymium iron boron permanent magnet material with the passivation film, and forming a zinc-rich coating after curing;
and step three, performing electrophoretic coating or spraying epoxy resin coating on the surface of the neodymium iron boron permanent magnet material with the passivation film and the zinc-rich coating, and curing to form an epoxy resin layer to obtain the surface-treated neodymium iron boron permanent magnet material.
Preferably, in the method for processing the surface of the neodymium iron boron permanent magnet material, the oil removal processing in the first step comprises the following specific steps: the method comprises the steps of putting a neodymium iron boron permanent magnet material into an alkaline degreasing liquid, and ultrasonically degreasing for 1-4 min at 50-70 ℃, wherein the pH value of the alkaline degreasing liquid is 9-11, and each liter of the alkaline degreasing liquid contains 25-35 g of sodium carbonate, 5-15 g of sodium phosphate and 2-3mL of surfactant.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, the rust removal treatment in the first step comprises the following specific steps: putting the deoiled neodymium iron boron permanent magnet material into a nitric acid solution with a mass ratio of water to a nitric acid stock solution of 24:1, carrying out acid washing for 20-40 s, and then carrying out ultrasonic cleaning for 30-60 s, wherein the mass fraction of the nitric acid stock solution is 65%.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, in the passivation treatment in the step one, the neodymium iron boron permanent magnet material after rust removal treatment is put into a passivation solution with the pH value of 4-5.5 for passivation treatment for 180-360 s, wherein the passivation solution comprises the following components in percentage by weight: 10-20% of silicate, 4-8% of fluosilicate, 2-5% of sodium fluoride, 1-3% of accelerator, 2-5% of water-dispersible nano silica gel and the balance of pure water.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, the zinc-rich coating comprises the following components in percentage by weight: 30-40% of zinc flakes, 20-30% of methyl modified organic silicon resin and the balance of organic solvent, wherein the particle size of the zinc flakes is 5-30 μm.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, the curing conditions in the second step are as follows: drying and curing for 30-50 min at 230-250 ℃, wherein the curing conditions in the third step are as follows: drying and curing for 30-50 min at 180-200 ℃.
Preferably, in the surface treatment method for the neodymium iron boron permanent magnet material, an electrophoretic paint bath solution adopted by electrophoretic coating of the epoxy resin paint in the third step comprises epoxy resin and color paste, the mass ratio of the epoxy resin to the color paste in the electrophoretic paint bath solution is 3-8: 1, the epoxy resin is CR691B, the color paste is CP524C, and the solid content of the electrophoretic paint bath solution is 16-22%.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, the mass ratio of the epoxy resin to the thinner in the epoxy resin coating sprayed in the third step is 100:70-90, the epoxy resin is 501K, and the thinner is 501 ST.
Preferably, in the surface treatment method of the neodymium iron boron permanent magnet material, the thickness of the passivation film is less than 1 μm, the thickness of the zinc-rich coating is 5-10 μm, and the thickness of the epoxy resin layer is 15-30 μm.
The neodymium iron boron permanent magnet material product is prepared according to the neodymium iron boron permanent magnet material surface treatment method.
The invention at least comprises the following beneficial effects:
the invention combines the spray zinc-rich coating and the epoxy resin coating, and adds passivation treatment before the spray coating. The corrosion resistance, acid and alkali resistance and adhesive force of the plating layer are obviously improved, the service life of the neodymium iron boron permanent magnet material is prolonged, and the use requirement of the current severe environment is met. The neodymium iron boron permanent magnet material product subjected to surface treatment has good corrosion resistance, the neutral salt spray test can reach 1800 hours (75 days), the high-temperature high-pressure test can reach 672 hours (28 days), and the corrosion resistance requirement of various severe environments on the neodymium iron boron permanent magnet material can be met.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
Example 1
The surface treatment method of the neodymium iron boron permanent magnet material comprises the following steps:
(1) carrying out oil removal treatment on the neodymium iron boron permanent magnet material: the neodymium iron boron magnet with the size of 40 multiplied by 10 multiplied by 6mm is put into alkaline degreasing liquid, ultrasonic degreasing is carried out for 2min at the temperature of 65 ℃ to remove oil stains on the surface of the magnet, and the degreasing liquid is prepared from the following components in percentage by weight: sodium carbonate (Na)2CO3)30g/L, sodium phosphate (NaPO)4.12H2O)10g/L, surfactant 2-3mL/L, and deoiling liquid pH 9-11.
(2) Carrying out rust removal treatment on the neodymium iron boron permanent magnet material: and (2) putting the deoiled neodymium iron boron magnet into a rust removing liquid, and soaking the neodymium iron boron magnet for 30s at room temperature to remove an oxide film on the surface of the neodymium iron boron magnet, wherein the rust removing liquid is formed by mixing 96 liters of water and 4 liters of nitric acid stock solution, and the mass fraction of the nitric acid stock solution is 65%. And ultrasonic cleaning for 40s after rust removal.
(3) Carrying out passivation treatment on the neodymium iron boron permanent magnet material: and (3) putting the neodymium iron boron magnet subjected to rust removal treatment into a chromium-free passivation solution, and passivating at room temperature for 240s to form a passivation film. The passivation solution comprises the following components in percentage by mass: 15% of silicate, 5% of fluosilicate, 3% of sodium fluoride, 2% of accelerator, 3% of water-dispersed nano-silica gel and the balance of pure water, wherein the pH value of the passivation solution is 4-5.5.
(4) Spraying a zinc-rich coating: spraying zinc-rich paint on the surface of the neodymium iron boron magnet with the passivation film, wherein the caliber of a spray gun is 1.0mm, the spraying distance is 20cm, the spraying angle is 55 degrees, and the spraying pressure is 0.3 MPa; the zinc-rich coating comprises the following components in percentage by mass: 35% of zinc flakes (particle size 20 μm), 25% of methyl modified silicone resin and the balance of solvent. The coating viscosity was 22 Pascal. sec, solids 40%.
(5) Curing to form a zinc-rich coating: drying and curing the neodymium iron boron magnet at 240 ℃ for 40 min; the thickness of the zinc-rich coating is 8 μm.
(6) Spraying an epoxy resin coating: spraying epoxy resin paint on the surface of the neodymium iron boron magnet with the passivation film and the zinc-rich coating, wherein the caliber of a spray gun is 1.0mm, the spraying distance is 20cm, the spraying angle is 55 degrees, and the spraying pressure is 0.3 MPa; the epoxy resin coating comprises the following components, by mass, 100: 80% of epoxy resin and 55% of diluent, 501K of epoxy resin and 501ST of diluent.
(7) Drying and curing to form an epoxy resin layer: drying and curing the magnet at 200 ℃ for 40 min; the thickness of the epoxy resin layer was 25 μm.
Example 2
The surface treatment method of the neodymium iron boron permanent magnet material comprises the following steps:
(1) carrying out oil removal treatment on the neodymium iron boron permanent magnet material: the neodymium iron boron magnet with the size of 40 multiplied by 10 multiplied by 6mm is put into alkaline degreasing liquid, ultrasonic degreasing is carried out for 2min at the temperature of 65 ℃ to remove oil stains on the surface of the magnet, and the degreasing liquid is prepared from the following components in percentage by weight: sodium carbonate (Na)2CO3)30g/L, sodium phosphate (NaPO)4.12H2O)10g/L, surfactant 2-3mL/L, and deoiling liquid pH 9-11.
(2) Carrying out rust removal treatment on the neodymium iron boron permanent magnet material: and (3) putting the deoiled neodymium iron boron magnet into a derusting solution, and soaking the neodymium iron boron magnet for 30s at room temperature to remove an oxide film on the surface of the neodymium iron boron magnet, wherein the derusting solution is formed by mixing 96 liters of water and 4 liters of nitric acid stock solution, and the mass fraction of the nitric acid stock solution is 65%. And ultrasonic cleaning for 40s after rust removal.
(3) Carrying out passivation treatment on the neodymium iron boron permanent magnet material: and (3) putting the neodymium iron boron magnet subjected to rust removal treatment into a chromium-free passivation solution, and passivating at room temperature for 240s to form a passivation film. The passivation solution comprises the following components in percentage by mass: 15% of silicate, 5% of fluosilicate, 3% of sodium fluoride, 2% of accelerator, 3% of water-dispersed nano-silica gel and the balance of pure water, wherein the pH value of the passivation solution is 4-5.5.
(4) Spraying a zinc-rich coating: spraying zinc-rich paint on the surface of the neodymium iron boron magnet with the passivation film, wherein the caliber of a spray gun is 1.0mm, the spraying distance is 20cm, the spraying angle is 55 degrees, and the spraying pressure is 0.3 MPa; the zinc-rich coating comprises the following components in percentage by mass: 35% of zinc flake (particle size 20 μm), 25% of silicone resin and the balance of organic solvent. The coating viscosity was 22 Pascal. sec, solids 40%.
(5) Curing to form a zinc-rich coating: drying and curing the neodymium iron boron magnet at 240 ℃ for 40 min; the thickness of the zinc-rich coating is 8 μm.
(6) Electrophoretic epoxy resin coating: carrying out electrophoretic coating on the surface of a neodymium iron boron magnet with a passive film and a zinc-rich coating, placing the magnet into a cathode electrophoretic solution for electrophoresis for 2min, wherein the cathode electrophoretic solution is a two-component epoxy resin paint, mixing the epoxy resin and color paste according to the weight ratio of 5: 1, and diluting the mixture by using deionized water, the epoxy resin is CR691B, the color paste is CP524C, and the process parameters are as follows: electrophoretic voltage: 130V, bath solution temperature: 29-30 ℃, pH value: 5.0-5.8, solid content: 20 percent.
(7) Drying and curing to form an epoxy resin layer: drying and curing the magnet at 200 ℃ for 45 min; the thickness of the epoxy resin layer was 26 μm.
Comparative example 1
Example 5 with application number CN 200910235745.
Comparative example 2
Example 4 with application number CN 201010606023.
Test 1
The corrosion resistance neutral salt spray test and the high temperature and high humidity test were performed on the ndfeb permanent magnet material products obtained in examples 1 and 2, and the results are shown in table 1, comparing with the performances of the surface-treated ndfeb magnets in comparative examples 1 and 2:
the corrosion resistance test is carried out in accordance with the national standard GB/T10125-1997 for the neutral salt spray test (NSS test), subject to the occurrence of yellow rust.
High temperature and humidity test conditions (PCT test, 130 ℃, 2.7bar, 100% RH).
TABLE 1 test results
Figure BDA0002345445130000051
Figure BDA0002345445130000061
As is apparent from Table 1, the corrosion resistance of the present invention is improved by 100 and 600 hours and the high temperature and high humidity ability is improved by 172 hours, respectively, as compared with comparative examples 1 and 2.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims (10)

1. The surface treatment method of the neodymium iron boron permanent magnet material is characterized by comprising the following steps:
the method comprises the following steps that firstly, after the neodymium iron boron permanent magnet material is subjected to oil removal, rust removal and passivation treatment, a passivation film is formed on the surface of the neodymium iron boron permanent magnet material;
step two, spraying a zinc-rich coating on the surface of the neodymium iron boron permanent magnet material with the passivation film, and forming a zinc-rich coating after curing;
and step three, performing electrophoretic coating or spraying epoxy resin coating on the surface of the neodymium iron boron permanent magnet material with the passivation film and the zinc-rich coating, and curing to form an epoxy resin layer to obtain the surface-treated neodymium iron boron permanent magnet material.
2. The surface treatment method of the neodymium-iron-boron permanent magnet material according to claim 1, characterized in that the oil removing treatment in the first step comprises the following specific steps: the method comprises the steps of putting a neodymium iron boron permanent magnet material into an alkaline degreasing liquid, and ultrasonically degreasing for 1-4 min at 50-70 ℃, wherein the pH value of the alkaline degreasing liquid is 9-11, and each liter of the alkaline degreasing liquid contains 25-35 g of sodium carbonate, 5-15 g of sodium phosphate and 2-3mL of surfactant.
3. The surface treatment method of the neodymium iron boron permanent magnet material according to claim 1, characterized in that the rust removing treatment in the step one comprises the following specific steps: putting the deoiled neodymium iron boron permanent magnet material into a nitric acid solution with a mass ratio of water to a nitric acid stock solution of 24:1, carrying out acid washing for 20-40 s, and then carrying out ultrasonic cleaning for 30-60 s, wherein the mass fraction of the nitric acid stock solution is 65%.
4. The surface treatment method of the neodymium iron boron permanent magnet material as claimed in claim 1, wherein the passivation treatment in the step one is to put the neodymium iron boron permanent magnet material after the rust removal treatment into a passivation solution with the pH value of 4-5.5 for passivation treatment for 180-360 s, wherein the passivation solution comprises the following components in percentage by weight: 10-20% of silicate, 4-8% of fluosilicate, 2-5% of sodium fluoride, 1-3% of accelerator, 2-5% of water-dispersible nano silica gel and the balance of pure water.
5. The surface treatment method of the neodymium iron boron permanent magnet material according to claim 1, wherein the zinc-rich coating comprises the following components in percentage by weight: 30-40% of zinc flakes, 20-30% of methyl modified organic silicon resin and the balance of organic solvent, wherein the particle size of the zinc flakes is 5-30 μm.
6. The surface treatment method for the neodymium-iron-boron permanent magnet material according to claim 1, wherein the curing conditions in the second step are as follows: drying and curing at 230-250 ℃ for 30-50 min, wherein the curing conditions in the third step are as follows: drying and curing for 30-50 min at 180-200 ℃.
7. The surface treatment method of the neodymium-iron-boron permanent magnet material according to claim 1, characterized in that electrophoretic paint bath solution adopted for electrophoretic coating of the epoxy resin coating in the third step comprises epoxy resin and color paste, the mass ratio of the epoxy resin to the color paste in the electrophoretic paint bath solution is 3-8: 1, the epoxy resin is CR691B, the color paste is CP524C, and the solid content of the electrophoretic paint bath solution is 16-22%.
8. The surface treatment method for the neodymium-iron-boron permanent magnet material as claimed in claim 1, wherein the mass ratio of the epoxy resin to the thinner in the epoxy resin coating sprayed in the third step is 100:70-90, the epoxy resin is 501K, and the thinner is 501 ST.
9. The surface treatment method of the neodymium-iron-boron permanent magnet material as claimed in claim 1, wherein the thickness of the passivation film is less than 1 μm, the thickness of the zinc-rich coating is 5-10 μm, and the thickness of the epoxy resin layer is 15-30 μm.
10. The product made of the neodymium iron boron permanent magnet material according to the surface treatment method of the neodymium iron boron permanent magnet material of any one of claims 1 to 9.
CN201911392747.5A 2019-12-30 2019-12-30 Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product Pending CN112791924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911392747.5A CN112791924A (en) 2019-12-30 2019-12-30 Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911392747.5A CN112791924A (en) 2019-12-30 2019-12-30 Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product

Publications (1)

Publication Number Publication Date
CN112791924A true CN112791924A (en) 2021-05-14

Family

ID=75803980

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911392747.5A Pending CN112791924A (en) 2019-12-30 2019-12-30 Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product

Country Status (1)

Country Link
CN (1) CN112791924A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101033363A (en) * 2007-04-10 2007-09-12 大连工业大学 Environment-friendly type galvanizing metal surface treating agent
CN102610354A (en) * 2011-01-24 2012-07-25 北京中科三环高技术股份有限公司 Processing method for corrosion-resistance rare-earth magnet and workpiece
CN102653643A (en) * 2012-04-24 2012-09-05 包头稀土研究院 Zinc-based composite coating for improving corrosion resistance of neodymium-iron-boron magnet
CN102936455A (en) * 2012-10-31 2013-02-20 沈阳中北通磁科技股份有限公司 Neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and preparation method thereof
CN103611667A (en) * 2013-11-28 2014-03-05 中国科学院金属研究所 Water-based inorganic-and-organic composite coating double-layer protection method for surface of Nd-Fe-B magnet material
CN104607377A (en) * 2015-02-04 2015-05-13 广东美的暖通设备有限公司 Metal tank for air conditioner outdoor unit and anti-corrosion treatment process of metal tank
CN108003753A (en) * 2017-12-25 2018-05-08 山东国舜建设集团有限公司 A kind of super-hydrophobic long lasting anticorrosion coating of automatically cleaning and preparation method thereof
CN108610784A (en) * 2016-12-02 2018-10-02 中国科学院宁波材料技术与工程研究所 A kind of erosion resistant coating and preparation method thereof on powdered metal surface
CN109778286A (en) * 2019-01-04 2019-05-21 安徽大地熊新材料股份有限公司 A kind of preparation method of Sintered NdFeB magnet surface corrosion-resistant erosion protective coating
CN110257830A (en) * 2019-07-11 2019-09-20 浙江九合金属表面处理技术有限公司 Galvanized sheet inorganic agent

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101033363A (en) * 2007-04-10 2007-09-12 大连工业大学 Environment-friendly type galvanizing metal surface treating agent
CN102610354A (en) * 2011-01-24 2012-07-25 北京中科三环高技术股份有限公司 Processing method for corrosion-resistance rare-earth magnet and workpiece
CN102653643A (en) * 2012-04-24 2012-09-05 包头稀土研究院 Zinc-based composite coating for improving corrosion resistance of neodymium-iron-boron magnet
CN102936455A (en) * 2012-10-31 2013-02-20 沈阳中北通磁科技股份有限公司 Neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and preparation method thereof
CN103611667A (en) * 2013-11-28 2014-03-05 中国科学院金属研究所 Water-based inorganic-and-organic composite coating double-layer protection method for surface of Nd-Fe-B magnet material
CN104607377A (en) * 2015-02-04 2015-05-13 广东美的暖通设备有限公司 Metal tank for air conditioner outdoor unit and anti-corrosion treatment process of metal tank
CN108610784A (en) * 2016-12-02 2018-10-02 中国科学院宁波材料技术与工程研究所 A kind of erosion resistant coating and preparation method thereof on powdered metal surface
CN108003753A (en) * 2017-12-25 2018-05-08 山东国舜建设集团有限公司 A kind of super-hydrophobic long lasting anticorrosion coating of automatically cleaning and preparation method thereof
CN109778286A (en) * 2019-01-04 2019-05-21 安徽大地熊新材料股份有限公司 A kind of preparation method of Sintered NdFeB magnet surface corrosion-resistant erosion protective coating
CN110257830A (en) * 2019-07-11 2019-09-20 浙江九合金属表面处理技术有限公司 Galvanized sheet inorganic agent

Similar Documents

Publication Publication Date Title
CN102031052B (en) Neodymium iron boron rare earth permanent magnet surface coating and application method thereof
CN103611667B (en) Water-based inorganic-and-organic composite coating double-layer protection method for surface of Nd-Fe-B magnet material
CN102418097B (en) Zinc plated/organic coating double-layer protection method for surface of neodymium-iron-boron magnet material
CN102732871A (en) Neodymium iron boron magnet material phosphating treatment and organic coating double layers protection method
CN102653643B (en) Zinc-based composite coating for improving corrosion resistance of neodymium-iron-boron magnet
CN102108510A (en) Vacuum aluminizing/cathode electrophoresis composite protective technique for NdFeB magnet and NdFeB magnet with composite protective layer
CN102534697B (en) Nickel plating/organic coating double-layer surface protection method for NdFeB (neodymium-iron-boron) magnet material
CN102965650B (en) Blackening layer and organic coating dual-protective method of neodymium iron boron magnetic material surface
CN105132900A (en) Anticorrosion treatment process for converting/electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys
CN107164754B (en) Method for improving corrosion resistance of sintered neodymium-iron-boron permanent magnet phosphate film
CN106128744B (en) A kind of Sintered NdFeB magnet surface temporary protection organic coating and preparation method
CN102400125B (en) Nd-Fe-B magnet material double-layered protecting method employing titanium/zirconium conversion coating and organic coating
CN102586769A (en) Nonphosphorus metal surface treatment agent and use method thereof
CN105602372A (en) Magnesium alloy surface protective high-hardness corrosion resistance composite coating and preparation method thereof
CN112663116A (en) Electrophoresis black epoxy process for improving corrosion resistance and binding force of neodymium iron boron magnet
CN102400189A (en) Surface treatment method for neodymium iron boron permanent magnetic material by organic aluminum plating
CN110983416A (en) Electrophoretic paint painting process
CN112176286B (en) Coating, metal magnet with coating and preparation method of coating
CN114713481A (en) Corrosion-resistant magnesium alloy with multi-stage protective coating and preparation method thereof
CN112791924A (en) Surface treatment method for neodymium iron boron permanent magnet material and permanent magnet material product
CN100484666C (en) Nd-Fe-B magnet inorganic sealing hole adhesion and cathode electrophoresis composite surface protection technique
CN106298220A (en) A kind of preparation method of the composite coating of motor Sintered NdFeB magnet
CN113414077B (en) Preparation method of zinc-aluminum organic double-layer composite coating on surface of bonded neodymium-iron-boron magnet material
CN114921782A (en) Composite treating agent for surface pretreatment of neodymium iron boron magnet and preparation method and application thereof
CN104250737A (en) Phosphatization technology for electrostatic spraying pre-treatment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210514