CN112267115A - Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof - Google Patents

Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof Download PDF

Info

Publication number
CN112267115A
CN112267115A CN202011060444.6A CN202011060444A CN112267115A CN 112267115 A CN112267115 A CN 112267115A CN 202011060444 A CN202011060444 A CN 202011060444A CN 112267115 A CN112267115 A CN 112267115A
Authority
CN
China
Prior art keywords
coating
resistant
metal
plating
corrosion
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.)
Granted
Application number
CN202011060444.6A
Other languages
Chinese (zh)
Other versions
CN112267115B (en
Inventor
叶瀚棽
傅东辉
施林舍
Original Assignee
Xiamen Tungsten Co Ltd
Fujian Changting Jinlong Rare Earth 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 Xiamen Tungsten Co Ltd, Fujian Changting Jinlong Rare Earth Co Ltd filed Critical Xiamen Tungsten Co Ltd
Priority to CN202011060444.6A priority Critical patent/CN112267115B/en
Publication of CN112267115A publication Critical patent/CN112267115A/en
Application granted granted Critical
Publication of CN112267115B publication Critical patent/CN112267115B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C28/00Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0617AIII BV compounds, where A is Al, Ga, In or Tl and B is N, P, As, Sb or Bi
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34Sputtering
    • C23C14/35Sputtering by application of a magnetic field, e.g. magnetron sputtering
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/50Substrate holders
    • C23C14/505Substrate holders for rotation of the substrates
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58After-treatment
    • C23C14/5846Reactive treatment
    • C23C14/5853Oxidation
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C28/00Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10Electroplating with more than one layer of the same or of different metals
    • C25D5/12Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34Pretreatment of metallic surfaces to be electroplated

Abstract

The invention discloses a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and a preparation method thereof, belonging to the technical field of metal magnet treatment. Plating a metal coating on the surface of a metal magnet by electroplating, and plating a secondary coating on the surface of the metal coating by vacuum plating; the secondary plating layer is a nonmetal alloy layer and/or a metal oxide layer and/or a metal nitride layer; and/or oxidizing gas is introduced to react with the secondary coating to obtain a compact passivation layer. The coating prepared by the invention can improve the surface structure and the wear resistance of the coating on one hand, and can prevent corrosive liquid from permeating and improve the corrosion resistance of the coating on the other hand. The preparation method is simple and economic, has reasonable design and wide application prospect.

Description

Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof
Technical Field
The invention relates to the technical field of metal magnet treatment, in particular to a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and a preparation method thereof.
Background
The neodymium iron boron permanent magnet material is a rare earth permanent magnet material with the largest usage amount at present, is widely applied to various industries such as computers, motors, wind driven generators, electric automobiles, instruments and meters, magnetic transmission bearings, high-fidelity speakers, nuclear magnetic resonance imagers, aerospace navigators and the like, and has great potential application prospects in the emerging technical fields of maglev trains and the like. China vigorously develops the industry of the neodymium iron boron magnet by virtue of the advantages of rare earth resources and production cost, and has become the first producing and consuming countries in the world.
The surface treatment of the neodymium iron boron permanent magnet material has important influence on the performance of the neodymium iron boron permanent magnet material, the existing surface treatment comprises electroplating, chemical plating, electrophoresis, vacuum deposition, coating and the like, the wear resistance of a metallic coating obtained by the traditional electroplating process is poor, the vacuum coating technology can be used for preparing metal-nonmetal alloy (such as TiN), nonmetal alloy (such as SiC) and other films besides the metallic coating, but the cost of the real-fast coating equipment is high, and the efficiency is low. Taking NiCuNi + TiN as an example, if a vacuum plating mode is adopted in the whole process, independent vacuum Ni plating equipment, Cu plating equipment and TiN plating equipment are needed, the equipment needs to wait for vacuum degree and temperature rise and fall during switching, the efficiency is low, and the cost is high. These conventional single surface treatment methods all result in limited corrosion resistance and wear resistance of the prepared surface coating, and therefore, it is an urgent need to develop a novel composite coating for the surface of a metal magnet to improve the corrosion resistance and wear resistance.
Disclosure of Invention
Technical problem to be solved by the invention
The invention aims to provide a corrosion-resistant and wear-resistant composite plating layer applicable to neodymium iron boron and a preparation method thereof, aiming at the technical problem that the wear resistance and corrosion resistance of the surface treated metal magnet materials such as neodymium iron boron in the prior art are poor.
Technical scheme
The invention provides a preparation method of a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron, which comprises the steps of firstly plating a metal coating on the surface of a metal magnet through electroplating, and then plating a secondary coating on the surface of the metal coating through vacuum plating; the secondary plating layer is a non-metal alloy layer and/or a metal oxide layer and/or a metal nitride layer.
Preferably, the metal plating layer is a single layer or multiple layers;
and/or the metal coating is one or more of zinc, nickel, copper, tin, zinc-nickel alloy, zinc-iron alloy and nickel-phosphorus alloy;
and/or the thickness of the metal plating layer is 5-20 μm.
Preferably, the metal element in the secondary coating is Al and/or Zn and/or Ti and/or Zr;
and/or the thickness of the secondary plating layer is 2-20 μm.
Preferably, the secondary coating is oxidized to obtain a composite coating with a dense passivation layer on the surface.
Preferably, the method comprises the following specific steps:
(1) plating a metal coating on the neodymium iron boron workpiece in a mode of oil removal, rust removal, activation, electroplating and blow drying;
(2) loading a metal magnet workpiece plated with a metal coating and a buffer material by a stainless steel mesh cage, carrying out vacuum nano composite coating, allowing the mesh cage to rotate and revolve simultaneously in the coating process, and carrying out multi-arc ion plating and/or magnetron sputtering coating to obtain a secondary coating.
(3) And introducing oxidizing gas into the vacuum chamber to react with the secondary coating to obtain a compact passivation layer.
Preferably, the electroplating mode in the step (1) is barrel plating and/or rack plating; the barrel plating adopts a unidirectional rotation mode or a forward and reverse alternate rotation mode, and the rack plating adopts a cathode linear movement mode or a rotary movement mode.
Preferably, one or more of sulfuric acid, nitric acid, hydrochloric acid and organic carboxylic acid is/are used as the activation solution in the step (1), the concentration of the activation solution is 0.05-4%, and the activation time is 5-120 s.
Preferably, the net cage in the step (2) is a cylindrical cage-shaped hanger, the diameter of which is 80-180mm, and the height of which is 800-1200 mm;
and/or the revolution rotating speed in the step (2) is 2-10r/min, the rotation rotating speed is 10-20r/min, and the coating current is 20-80A.
Preferably, the oxidizing gas in step (3) is one or more of nitrogen, oxygen, ozone and nitrogen oxide,
or a mixture of one or more of nitrogen, oxygen, ozone, nitrogen oxides and an inert gas.
The invention also provides a composite coating prepared by any one of the preparation methods.
Technical effects
Compared with the prior art, the invention has the beneficial effects that:
1. according to the corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron, the metal coating is plated on the surface of the metal magnet through electroplating, and then the secondary coating is plated on the surface of the metal coating through vacuum plating, wherein the secondary coating is a metal layer and/or a metal oxide layer and/or a metal nitride layer, and the prepared composite coating can effectively improve the wear resistance and the corrosion resistance.
2. According to the preparation method of the corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron, the secondary coating is oxidized to obtain the composite coating with the surface containing the compact passivation layer, and the surface of the composite coating is passivated after the preparation of the composite coating is completed, so that the surface roughness of the composite coating can be improved, the wear-resistant performance of the composite coating is improved, the corrosion-resistant performance of the composite coating is improved, and the penetration of corrosive liquid is prevented.
3. The corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and the preparation method thereof have the advantages of simple preparation process, economic materials and wide application prospect.
Drawings
FIG. 1 is a schematic representation of a 200 hour neutral salt spray test conducted on the composite deposit of example 1 of the present invention;
FIG. 2 is an SEM image of the surface of the composite coating layer of example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments; moreover, the embodiments are not relatively independent, and can be combined with each other according to needs, so that a better effect is achieved. 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
The embodiment provides a preparation method of a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron, which comprises the following specific steps:
step (1): loading 3kg of 20mm by 5mm neodymium iron boron magnet and 3kg of steel balls into a roller together, and removing oil at the temperature of 55 ℃ for 10 min;
step (2): performing acid cleaning and rust removal on the product obtained in the step (1) after twice water cleaning, wherein the acid cleaning time is 3min, and the acid cleaning conductivity is 100 mS/cm;
and (3): performing two-time washing on the product obtained in the step (2), then performing ultrasonic cleaning, and immediately activating after the cleaning is finished, wherein the activation time is 1 min; wherein, the activation adopts sulphuric acid as the activation liquid, and the concentration of the activation liquid is 0.05 percent;
and (4): performing two times of water washing on the product obtained in the step (3), then putting the product into a nickel tank for electroplating, controlling the film thickness to be 3 microns, wherein the current is 40A, and the time is 60 min;
and (5): and (5) washing the product obtained in the step (4) with three times of water, and activating for 1 min. Then copper plating is carried out after two times of water washing, the current is 30A, the time is 90min, and the film thickness is controlled to be 5 microns;
and (6): drying the product obtained in the step (5) by blanking and drying, loading the product in a stainless steel net cage, then placing the product in vacuum coating equipment, heating the product to 100 ℃, and vacuumizing the vacuum coating equipment to 9 x 10-3pa;
And (7): performing vacuum coating by adopting magnetron sputtering AlN plating, wherein revolution and rotation are performed simultaneously in the coating process, and the film layer is controlled to be 2 microns; wherein the net cage is a cylindrical cage-shaped hanger, the diameter of the net cage is 80mm, the height of the net cage is 800mm, the revolution speed is 5r/min, the rotation speed is 10r/min, and the coating current is 20A;
and (8): and (4) closing the target power supply after the film coating is finished, continuously filling oxygen until the vacuum degree is 2 x 10pa, and oxidizing for 20min to obtain a compact passivation layer.
The embodiment also provides the corrosion-resistant and wear-resistant composite coating which is prepared by the method and can be applied to the neodymium iron boron.
The composite coating obtained in the embodiment has high appearance consistency, high binding force grade 0 in a Baige test (GB/T9286-1998 paint and varnish paint film lattice test), high Vickers hardness 3301HV and excellent wear resistance;
as can be seen from figure 1, the composite plating layer subjected to the neutral salt spray test has a perfect surface and effectively prevents the invasion of corrosive liquid, and the neutral salt spray test is more than 200 hours; as can be seen from the SEM of fig. 2, the composite plating layer has a dense surface, small and few pores, can effectively prevent corrosive substances from entering, and has excellent corrosion resistance.
Comparative example 1
The comparative example provides a preparation method of a coating applicable to neodymium iron boron, which is different from the preparation method of example 1 in that only nickel and copper electroplating is carried out, subsequent magnetron sputtering coating is not carried out, and the rest steps are substantially the same, and the specific preparation method comprises the following steps:
step (1): loading 3kg of 20mm by 5mm neodymium iron boron magnetic steel and 3kg of steel balls into a roller together, and performing ultrasonic oil removal at the oil removal temperature of 55 ℃, for 10min and at the roller rotation speed of 4 r/min;
step (2): performing acid washing and rust removal on the product obtained in the step (1) after twice water washing, wherein the acid washing time is 3min, the acid washing conductivity is 100mS/cm, and the roller rotating speed is 4 r/min;
and (3): performing two-time washing on the product obtained in the step (2), then performing ultrasonic cleaning, and immediately activating after the cleaning is finished, wherein the activation time is 1min, and the rotating speed of a roller is 4 r/min;
and (4): performing two times of water washing on the product obtained in the step (3), then putting the product into a nickel tank for electroplating, controlling the current to be 40A, the time to be 60min, the rotating speed of a roller to be 4r/min, and controlling the film thickness to be 3 microns;
and (5): and (5) washing the product obtained in the step (4) with three times of water, and activating for 1 min. Then copper plating is carried out after two times of water washing, the current is 30A, the time is 90min, the film thickness is controlled to be 5 microns, and the rotating speed of a roller is 4 r/min;
and (6): and (5) washing the product obtained in the step (5) with three times of water, and activating for 1 min. Then, after two times of water washing, nickel plating is carried out, the current is 30A, the time is 90min, the film thickness is controlled to be 2 microns, and the rotating speed of a roller is 4 r/min;
and (7): and (4) drying the product obtained in the step (6) at a temperature of 80 ℃ for 1 h.
This comparative example also provides a coating prepared as described above.
The composite coating obtained by the comparative example has high appearance consistency, and the binding force is in the grade of 0 in the Baige test (GB/T9286-1998 paint and varnish test), the neutral salt spray test is carried out for 72h, the rust is generated, and the Vickers hardness is 550 HV.
Comparing comparative example 1 with example 1, it can be seen that the corrosion resistance and wear resistance of the plating layer obtained by the single electroplating method are reduced, which shows the excellent performance of the composite plating layer of example 1 of the present invention.
Comparative example 2
The comparative example provides a preparation method of a coating applicable to neodymium iron boron, which is different from the preparation method of example 1 in that only magnetron sputtering coating is carried out, electroplating is not carried out, and the rest steps are approximately the same, and the specific preparation method comprises the following steps:
step (1): loading 3kg of 20mm by 5mm neodymium iron boron magnetic steel and 3kg of steel balls into a roller together, and performing ultrasonic oil removal at the oil removal temperature of 55 ℃, for 10min and at the roller rotation speed of 4 r/min;
step (2): performing acid washing and rust removal on the product obtained in the step (1) after twice water washing, wherein the acid washing time is 3min, the acid washing conductivity is 100mS/cm, and the roller rotating speed is 4 r/min;
and (3): washing the product obtained in the step (2) twice, blanking and drying;
and (4): putting the product obtained in the step (3) and 3kg of steel balls into a stainless steel mesh cage, heating the stainless steel mesh cage to 100 ℃ in vacuum coating equipment, and vacuumizing the vacuum coating equipment to 9 x 10-3pa;
And (5): performing vacuum coating by adopting magnetron sputtering AlN plating, and controlling the film layer to be 5 microns;
and (6): and (3) closing the target power supply after the film coating is finished, continuously filling oxygen to the vacuum degree of 2 x 10pa, oxidizing for 20min, cooling to the temperature below 80 ℃, and discharging.
This comparative example also provides a coating prepared as described above.
The composite plating layer obtained by the comparative example has high appearance consistency and binding force of grade 0 (GB/T9286-1998 paint and varnish test), and the composite plating layer rusts in 48h of neutral salt spray test and has Vickers hardness of 2905 HV.
It can be seen that the vacuum-coated layer exhibited poor corrosion resistance and wear resistance in the absence of the electroplated layer in this comparative example.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined (e.g., between various embodiments), adapted and/or substituted as would be recognized by those skilled in the art from the foregoing detailed description, and which may be combined as desired. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims (10)

1. A preparation method of a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron is characterized in that a metal coating is plated on the surface of a metal magnet through electroplating, and then a secondary coating is plated on the surface of the metal coating through vacuum plating; the secondary plating layer is a non-metal alloy layer and/or a metal oxide layer and/or a metal nitride layer.
2. The method for preparing a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 1, wherein the metal coating is a single layer or multiple layers;
and/or the metal coating is one or more of zinc, nickel, copper, tin, zinc-nickel alloy, zinc-iron alloy and nickel-phosphorus alloy;
and/or the thickness of the metal plating layer is 5-20 μm.
3. The method for preparing a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 1, wherein the metal elements in the secondary coating comprise Al and/or Zn and/or Ti and/or Zr;
and/or the thickness of the secondary plating layer is 2-20 μm.
4. The method for preparing the corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 1, wherein the secondary coating is oxidized to obtain a coating with a dense passivation layer on the surface.
5. The preparation method of the corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 1, which is characterized by comprising the following specific steps:
(1) plating a metal coating on the neodymium iron boron workpiece in a mode of oil removal, rust removal, activation, electroplating and blow drying;
(2) loading a metal magnet workpiece plated with a metal coating and a buffer material by a stainless steel mesh cage, carrying out vacuum nano composite coating, allowing the mesh cage to rotate and revolve simultaneously in the coating process, and carrying out multi-arc ion plating and/or magnetron sputtering coating to obtain a secondary coating.
(3) And introducing oxidizing gas into the vacuum chamber to react with the secondary coating to obtain a compact passivation layer.
6. The method for preparing the corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 5, wherein the electroplating mode in the step (1) is barrel plating and/or rack plating; wherein the barrel plating adopts a unidirectional rotation mode or a forward and reverse alternate rotation mode; and/or the rack plating adopts a cathode linear movement or rotary movement mode.
7. The method for preparing a corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron according to claim 5, wherein one or more of sulfuric acid, nitric acid, hydrochloric acid and organic carboxylic acid is/are used as an activation solution for the activation in the step (1), the concentration of the activation solution is 0.05-4%, and the activation time is 5-120 s.
8. The method as claimed in claim 5, wherein the cylinder cage in step (2) is a cylindrical cage-shaped hanger with a diameter of 80-180mm and a height of 800-;
and/or the revolution rotating speed in the step (2) is 2-10r/min, the rotation rotating speed is 10-20r/min, and the coating current is 20-80A.
9. The method for preparing a corrosion-resistant and wear-resistant composite coating applied to NdFeB according to claim 5, wherein the oxidizing gas in the step (3) is one or more of nitrogen, oxygen, ozone and nitrogen oxide,
or a mixture of one or more of nitrogen, oxygen, ozone, nitrogen oxides and an inert gas.
10. A corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron, which is characterized in that the composite coating prepared by the preparation method of any one of claims 1 to 9.
CN202011060444.6A 2020-09-30 2020-09-30 Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof Active CN112267115B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011060444.6A CN112267115B (en) 2020-09-30 2020-09-30 Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011060444.6A CN112267115B (en) 2020-09-30 2020-09-30 Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof

Publications (2)

Publication Number Publication Date
CN112267115A true CN112267115A (en) 2021-01-26
CN112267115B CN112267115B (en) 2022-07-12

Family

ID=74337022

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011060444.6A Active CN112267115B (en) 2020-09-30 2020-09-30 Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112267115B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010057967A (en) * 1999-12-23 2001-07-05 신현준 Multilayer coated Nd-Fe-B magnet and its manufacturing method
CN101457357A (en) * 2007-12-14 2009-06-17 比亚迪股份有限公司 Film coating material and preparation method thereof
CN101724845A (en) * 2008-10-31 2010-06-09 中国科学院金属研究所 Method for electroplating zinc-nickel alloy on sintered neodymium-iron-boron material
CN106756794A (en) * 2017-01-18 2017-05-31 安徽大地熊新材料股份有限公司 A kind of preparation method of high temperature resistant Sintered NdFeB magnet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010057967A (en) * 1999-12-23 2001-07-05 신현준 Multilayer coated Nd-Fe-B magnet and its manufacturing method
CN101457357A (en) * 2007-12-14 2009-06-17 比亚迪股份有限公司 Film coating material and preparation method thereof
CN101724845A (en) * 2008-10-31 2010-06-09 中国科学院金属研究所 Method for electroplating zinc-nickel alloy on sintered neodymium-iron-boron material
CN106756794A (en) * 2017-01-18 2017-05-31 安徽大地熊新材料股份有限公司 A kind of preparation method of high temperature resistant Sintered NdFeB magnet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邓文宇等: "钕铁硼永磁材料腐蚀机理及防护研究进展", 《真空》 *

Also Published As

Publication number Publication date
CN112267115B (en) 2022-07-12

Similar Documents

Publication Publication Date Title
CN100464007C (en) Process for preparing neodymium-iron-boron permanent magnetic material surface gradient function coating layer
CN102808210B (en) Micro-arc oxidation surface treatment method and product prepared by same
EP3486925B1 (en) Ndfeb magnet with composite coating and preparation process thereof
US11242612B2 (en) Composite electroplating method for sintered Nd—Fe-B magnet
CN102021629A (en) Method for preparing titanium-alloy surface micro-arc oxidation antifriction compound film layer
CN101226800B (en) Surface treating method for sintering type Nd iron boron permanent magnetic material
CN103173763A (en) Electroplating and vapor deposition composite protection method for neodymium-iron-boron magnet
CN102828218B (en) Electrolyte used for magnesium alloy anode oxidation treatment and treatment method
CN102586829A (en) Process method for reducing magnetic loss of neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions
CN106756794A (en) A kind of preparation method of high temperature resistant Sintered NdFeB magnet
JP2005310975A (en) Sintered neodymium magnet, its manufacturing method and rotary machine
CN108018497A (en) A kind of method that neodymium iron boron magnetic body and neodymium iron boron magnetic body surface prepares aluminum alloy coating
CN101845653A (en) Preparation method of micro-arc oxidation film layer under effect of magnetic field
CN112267115B (en) Corrosion-resistant and wear-resistant composite coating applicable to neodymium iron boron and preparation method thereof
CN107164754B (en) Method for improving corrosion resistance of sintered neodymium-iron-boron permanent magnet phosphate film
JP2009099853A (en) Highly corrosion-resistant r-t-b based rare earth magnet
Darband et al. Electrochemical phosphate conversion coatings: A review
CN111926366A (en) Sintered neodymium-iron-boron magnet surface corrosion-resistant coating and preparation method thereof
CN111020484B (en) Neodymium-iron-boron magnet containing nano composite film and preparation method thereof
CN101451263B (en) Method for electrophoretic deposition of rare-earth lanthanum oxide film on aluminium alloy surface
CN110993231A (en) Surface-alloyed high-corrosion-resistance sintered NdFeB magnet and preparation method thereof
JP2004111516A (en) R-t-b rare earth magnet of high corrosion resistance
CN112176286B (en) Coating, metal magnet with coating and preparation method of coating
JP5994960B1 (en) Steel plate for container and method for producing steel plate for container
CN112522749B (en) Preparation method of rare earth permanent magnet material surface corrosion-resistant coating and product

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
TA01 Transfer of patent application right

Effective date of registration: 20220609

Address after: 366300 new industrial zone, Changting Economic Development Zone, Longyan City, Fujian Province

Applicant after: FUJIAN CHANGTING GOLDEN DRAGON RARE-EARTH Co.,Ltd.

Address before: 366300 new industrial zone, Changting Economic Development Zone, Longyan City, Fujian Province

Applicant before: FUJIAN CHANGTING GOLDEN DRAGON RARE-EARTH Co.,Ltd.

Applicant before: XIAMEN TUNGSTEN Co.,Ltd.

TA01 Transfer of patent application right
GR01 Patent grant
GR01 Patent grant