CN112439675A - Rare earth magnetic anti-corrosion spraying process - Google Patents
Rare earth magnetic anti-corrosion spraying process Download PDFInfo
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- CN112439675A CN112439675A CN201910830867.2A CN201910830867A CN112439675A CN 112439675 A CN112439675 A CN 112439675A CN 201910830867 A CN201910830867 A CN 201910830867A CN 112439675 A CN112439675 A CN 112439675A
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- 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
- B05D7/14—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 to metal, e.g. car bodies
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0426—Cooling with air
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- 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
- B05D2301/00—Inorganic additives or organic salts thereof
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- Engineering & Computer Science (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the technical field of metal rust prevention, and particularly relates to a rare earth magnetic rust prevention spraying process. The process comprises the steps of surface cleaning, drying, dedusting, spraying, curing, cooling, overturning, spraying, curing, cooling and the like, wherein an anti-corrosion and high-temperature-resistant coating is formed on the surface of the magnetic steel, so that zero discharge of harmful substances can be realized in a processing procedure, a good protection effect on the environment can be realized, and the personal safety of processing workers can be guaranteed; secondly, the process has good effect of blocking the external temperature and good thermal stability.
Description
Technical Field
The invention belongs to the technical field of metal rust prevention, and particularly relates to a rare earth magnetic rust prevention spraying process.
Background
Since the 80's of the 20 th century, magnets containing neodymium (Nd) as a rare earth element have been commercialized for use. For many years, rare earth magnets such as neodymium iron boron (Nd-Fe-B) containing magnets are widely applied to the fields of motor driving, aerospace, automobiles, electric automobiles, household appliances, imaging and the like.
Because of its multi-phase microstructure, e.g., having matrix phases neodymium iron boron magnet (matrix phase Nd2Fe 14B), neodymium rich phase (Nd-rich phase) and boron rich phase (B-rich phase), neodymium iron boron magnet is susceptible to corrosion and oxidation, which can significantly shorten the life cycle of neodymium iron boron magnet. In one conventional technique, an anti-rust/anti-oxidation layer may be formed on the ndfeb magnet by an electroplating process. A typical electroplating process requires placing the neodymium iron boron magnet in an acid solution (electroplating bath) and applying an electrical potential across the neodymium iron boron magnet and the electroplated material immersed in the acid solution. The electroplating solution is not only toxic to human and animals, but also harmful to the environment, and especially when galvanizing and nickeling, the electroplating solution can seriously pollute the surrounding water source, soil and air, and can generate a large amount of acid gas to corrode the surrounding buildings. In addition, the electroplating process has the defects of short anti-oxidation life, poor high-temperature resistance and moisture resistance, easy peeling of a surface coating and the like. In another conventional technique, an anti-rust/anti-oxidation layer (e.g., an oxide film) may be formed on the ndfeb magnet, wherein the process of forming the anti-rust/anti-oxidation layer requires high temperature treatment of the ndfeb magnet, which may cause irreversible demagnetization of the magnet. Still other rust/oxidation resistant layers do not have good adhesion to ndfeb magnets (e.g., due to differences in coefficients of thermal expansion), resulting in crack resistance and peeling of the rust/oxidation resistant layer.
Disclosure of Invention
The method is used for solving the problem that the traditional electroplated magnetic steel is harmful to people and the environment, and provides the rare earth magnetic spraying process which is high temperature resistant, rust-proof, high in surface hardness and not easy to peel.
In order to achieve the purpose, the invention adopts the following technical scheme, and the invention comprises the following steps:
(1) surface cleaning: cleaning the surface of the magnetic steel by using a degreasing agent at the temperature of 40-50 ℃ in a spraying and ultrasonic mode for 1-2 minutes, and aiming at removing dirt on the surface of a workpiece and improving the adhesive force of a coating;
(2) and (3) drying: drying the magnetic steel obtained in the step (1) by using strong wind at 40-50 ℃, wherein the drying time is 5-7 minutes;
(3) dust removal: remove dust through the magnet steel that ion air knife obtained step (2), traditional high pressure is blown and is removed dust has a great deal of drawback, if: the blown air flow is not uniform; the consumption of compressed air is very high; although the impact force is strong, the noise level is too high, and the health of field operators is seriously influenced; the blowing products using electric energy as power often need frequent maintenance, and have short service life and the like. The ion air knife dust removal realizes dust removal rapidly and efficiently through thin and long air flow with large flow, strong impact, low air consumption, low noise and uniform flow, and the working air flow is as follows: the air amplification ratio can reach 40: 1. strong blowing force, maintenance-free, no moving part, no electric part, uniform airflow, strong force, low noise, adjustable flow and simple structure; the noise level was only 69 db (at a pressure of 5.5 bar);
(4) spraying: uniformly spraying the spraying solution on the surface of the magnetic steel obtained in the step (3) in a closed environment, wherein the thickness of the coating is 10-20 microns;
(5) and (3) curing: drying the magnetic steel obtained in the step (4) at the temperature of 120-250 ℃ for 15-40 minutes, and simultaneously discharging gas in a drying room to prevent the concentration of combustible from exceeding the deflagration limit;
(6) cooling: reducing the temperature of the magnetic steel obtained in the step (5) to 30-50 ℃ through strong cold air, wherein the temperature reduction time is 10-20 minutes;
(7) turning: overturning the magnetic steel obtained in the step (6);
(8) spraying: uniformly spraying the spraying solution on the surface of the magnetic steel obtained in the step (7) in a closed environment;
(9) and (3) curing: drying the magnetic steel obtained in the step (8) at the temperature of 120-250 ℃ for 15-40 minutes, and simultaneously discharging gas in a drying room to prevent the concentration of combustible from exceeding the deflagration limit;
(10) cooling: and (4) reducing the temperature of the magnetic steel obtained in the step (9) to 30-50 ℃ through strong cold air, wherein the temperature reduction time is 10-20 minutes.
Further, the spraying solution in the steps (4) and (8) is an anti-corrosion solution, the anti-corrosion solution is prepared by adding fine metal particles or high-temperature-resistant resin into a chemical solution, the metal particles comprise at least one of zinc particles, copper particles, stainless steel particles, aluminum particles, chromium particles, nickel particles or other metal particles, and the chemical solution comprises at least one of trichloropropane, ethyl acetate, trimethylbenzene, tetramethylbenzene, ethyl acrylate, styrene, alpha-methyl styrene, methyl methacrylate, resin, isobutanol, N-butanol, chlorinated paraffin, polyoxyethylene ether, N-methylolacrylamide and the like.
Further, a natural cooling step is added before the steps (5) and (9), the natural cooling time is 8-15 minutes, the solvent is ensured to volatilize, the surface of the coating is dried to form a film, and the coating is minimized in shrinkage.
Further, when the magnetic steel is subjected to multi-layer spraying, the steps (4) - (10) are repeated, and the spraying solution used for each layer of spraying is determined according to the protective property, for example, the magnetic steel is subjected to two spraying operations, the spraying process of the steps (4) - (10) is carried out on the inner layer by using the first spraying solution, and the spraying process of the steps (4) - (10) is carried out on the outer layer by using the second spraying solution again.
Further, in the step (4) and the step (8), a robot is used for spraying, so that the coating is more uniform.
Compared with the prior art, the traditional anti-rust technology is electroplating, a large amount of chemical medicines such as strong acid, strong base, salts, organic solvent and the like are used in electroplating production, and a large amount of toxic and harmful gas can be emitted in the operation process, if safety management work is not good, poisoning and burning are easy to happen, so that combustion and explosion accidents are caused; in addition, the waste electroplating solution contains a large amount of heavy metals, such as hexavalent chromium, which is difficult to perform harmless treatment and difficult to degrade in natural environment. The process has the advantages that firstly, the coating with rust resistance, high temperature resistance and square peeling is formed on the surface of the magnetic steel in a spraying mode, zero emission of harmful substances can be realized in a processing procedure, a good protection effect on the environment is realized, and meanwhile, the personal safety of processing workers is guaranteed; secondly, the process has good effect of blocking the external temperature and good thermal stability.
Drawings
FIG. 1 is a schematic view of a first spray application according to one aspect of the present disclosure;
FIG. 2 is a schematic view of a second spray application according to one aspect of the present disclosure;
in the figure: 1-magnetic steel and 2-spraying robot.
Detailed Description
The present invention will be further explained with reference to the embodiments, but the invention is not limited thereto, and the structures, the proportions, the sizes, and the like, which are shown in the drawings, are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion, or adjustments in size, should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "front", "rear" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
In the first embodiment of the disclosure, as shown in fig. 1 and 2, a rare earth magnetic rust prevention spraying process performs spraying operation by a robot, the spraying solution adopts a metal particle spraying solution containing zinc and aluminum, and the spraying steps are as follows:
(1) surface cleaning: cleaning the surface of the magnetic steel for 1 minute by using a degreasing agent with the temperature of 45 ℃ in a spraying and ultrasonic mode;
(2) and (3) drying: drying the magnetic steel obtained in the step (1) by strong wind at 40 ℃ for 5 minutes;
(3) dust removal: dedusting the magnetic steel obtained in the step (2) through an ion air knife;
(4) spraying: as shown in fig. 1, uniformly spraying a spraying solution on the surface of the magnetic steel obtained in the step (2) in a closed environment;
(5) and (3) natural cooling: naturally cooling the magnetic steel obtained in the step (4) for 10 minutes to ensure that the solvent is volatilized, the surface of the coating is dried to form a film, and the shrinkage of the coating is minimum;
(6) and (3) curing: drying the magnetic steel obtained in the step (5) at the temperature of 180 ℃ for 30 minutes;
(7) cooling: reducing the temperature of the magnetic steel obtained in the step (6) to 40 ℃ by strong cold air;
(8) turning: overturning the magnetic steel obtained in the step (7);
(9) spraying: as shown in fig. 2, uniformly spraying the first spraying solution on the surface of the magnetic steel obtained in step (8) in a closed environment;
(10) and (3) natural cooling: naturally cooling the magnetic steel obtained in the step (9) for 10 minutes to ensure that the solvent is volatilized, the surface of the coating is dried to form a film, and the shrinkage of the coating is minimum;
(11) and (3) curing: drying the magnetic steel obtained in the step (10) at the temperature of 180 ℃ for 30 minutes;
(12) cooling: and (3) reducing the temperature of the magnetic steel obtained in the step (11) to 40 ℃ by strong cold air.
The sprayed magnetic steel is subjected to a salt spray test:
the sprayed magnetic steel is subjected to an adhesion test:
note: best adhesion at 0 th level and worst adhesion at 5 th level
In the second embodiment of the present disclosure, when the magnetic steel is subjected to multi-layer spraying, the steps (3) - (9) of the first embodiment are repeated, wherein the spraying solution is determined according to the protective property of the current coating.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The rare earth magnetic rust-proof spraying process is characterized by comprising the following steps:
(1) surface cleaning: cleaning the surface of the magnetic steel by using a degreasing agent at the temperature of 40-50 ℃ in a spraying and ultrasonic mode for 1-2 minutes;
(2) and (3) drying: drying the magnetic steel obtained in the step (1) by using strong wind at 40-50 ℃, wherein the drying time is 5-7 minutes;
(3) dust removal: dedusting the magnetic steel obtained in the step (2) through an ion air knife;
(4) spraying: uniformly spraying the spraying solution on the surface of the magnetic steel obtained in the step (3) in a closed environment;
(5) and (3) curing: drying the magnetic steel obtained in the step (4) at the temperature of 120-250 ℃ for 15-40 minutes;
(6) cooling: reducing the temperature of the magnetic steel obtained in the step (5) to 30-50 ℃ by strong cold air;
(7) turning: overturning the magnetic steel obtained in the step (6);
(8) spraying: uniformly spraying the spraying solution on the surface of the magnetic steel obtained in the step (7) in a closed environment;
(9) and (3) curing: drying the magnetic steel obtained in the step (8) at the temperature of 120-250 ℃ for 15-40 minutes;
(10) cooling: and (4) reducing the temperature of the magnetic steel obtained in the step (9) to 30-50 ℃ by strong cold air.
2. The rare earth anti-rust spraying process according to claim 1, characterized in that: the spraying solution in the steps (4) and (8) is rust-proof and high-temperature-resistant, and the spraying solution comprises a solution containing heat-resistant resin particles and metal particles.
3. The rare earth anti-rust spraying process according to claim 1, characterized in that: and (4) adding a natural cooling step before the steps (5) and (9), wherein the natural cooling time is 8-15 minutes.
4. The rare earth magnetic rust-preventive spraying process as claimed in claim 1 or 3, characterized in that: and (5) when the magnetic steel is subjected to multi-layer spraying, repeating the steps (4) to (10), wherein the spraying solution used for spraying each layer is determined according to the protective property.
5. The rare earth magnetic rust prevention spraying process as claimed in claim 1, characterized in that: in the step (4) and the step (8), a robot is used to perform the painting operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910830867.2A CN112439675A (en) | 2019-09-04 | 2019-09-04 | Rare earth magnetic anti-corrosion spraying process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910830867.2A CN112439675A (en) | 2019-09-04 | 2019-09-04 | Rare earth magnetic anti-corrosion spraying process |
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| CN112439675A true CN112439675A (en) | 2021-03-05 |
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| CN201910830867.2A Pending CN112439675A (en) | 2019-09-04 | 2019-09-04 | Rare earth magnetic anti-corrosion spraying process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6421906A (en) * | 1987-07-17 | 1989-01-25 | Nippon Steel Corp | Rare earth magnet having barrier film against hydrogen |
| CN1222412A (en) * | 1997-11-12 | 1999-07-14 | 北京市石景山区京磁技术公司 | Anticorrosion method for surface of Nd-Fe-B permanet magnet |
| CN103911072A (en) * | 2012-12-28 | 2014-07-09 | 中磁科技股份有限公司 | Coating solution for neodymium iron boron magnet surface protection and use method thereof |
| CN104148256A (en) * | 2014-07-10 | 2014-11-19 | 北京京磁电工科技有限公司 | Coating method of neodymium-iron-boron magnets |
| CN107931062A (en) * | 2017-11-23 | 2018-04-20 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of Sintered NdFeB magnet surface abrasion resistance corrosion-inhibiting coating |
| CN108364780A (en) * | 2018-05-09 | 2018-08-03 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of Sintered NdFeB magnet surface high-corrosion-resistance coating |
-
2019
- 2019-09-04 CN CN201910830867.2A patent/CN112439675A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6421906A (en) * | 1987-07-17 | 1989-01-25 | Nippon Steel Corp | Rare earth magnet having barrier film against hydrogen |
| CN1222412A (en) * | 1997-11-12 | 1999-07-14 | 北京市石景山区京磁技术公司 | Anticorrosion method for surface of Nd-Fe-B permanet magnet |
| CN103911072A (en) * | 2012-12-28 | 2014-07-09 | 中磁科技股份有限公司 | Coating solution for neodymium iron boron magnet surface protection and use method thereof |
| CN104148256A (en) * | 2014-07-10 | 2014-11-19 | 北京京磁电工科技有限公司 | Coating method of neodymium-iron-boron magnets |
| CN107931062A (en) * | 2017-11-23 | 2018-04-20 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of Sintered NdFeB magnet surface abrasion resistance corrosion-inhibiting coating |
| CN108364780A (en) * | 2018-05-09 | 2018-08-03 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of Sintered NdFeB magnet surface high-corrosion-resistance coating |
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Application publication date: 20210305 |