CN102102201A - Surface preservative treatment for neodymium iron boron bonded magnet - Google Patents
Surface preservative treatment for neodymium iron boron bonded magnet Download PDFInfo
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- CN102102201A CN102102201A CN2009102015373A CN200910201537A CN102102201A CN 102102201 A CN102102201 A CN 102102201A CN 2009102015373 A CN2009102015373 A CN 2009102015373A CN 200910201537 A CN200910201537 A CN 200910201537A CN 102102201 A CN102102201 A CN 102102201A
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- iron
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- chemical solution
- anticorrosion treatment
- iron boron
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Abstract
The invention discloses a surface preservative treatment for a neodymium iron boron bonded magnet, which comprises the following steps of: 1, putting the neodymium iron boron bonded magnet into deionized water, and cleaning surface dust and impurities; 2, soaking the neodymium iron boron bonded magnet treated in the step 1 into chemical solution; and 3, cleaning the neodymium iron boron bonded magnet treated in the step 2 in the deionized water, and then naturally drying or baking the cleaned neodymium iron boron bonded magnet so as to form a crystal film on the surface of the neodymium iron boron bonded magnet. The compact crystal film is generated on the surface of the magnet by chemical reaction, and the crystal film has good corrosion resistance and good hardness and heat resistance and can play a role in preventing rust, resisting abrasion and reducing abrasion.
Description
Technical field
The present invention relates to a kind of surface treatment method of neodymium iron boron magnetic body, refer to a kind of surface anticorrosive treatment method of Agglutinate neodymium-iron-boron magnet especially.
Background technology
Third generation permanent magnet material---Nd-Fe-B permanent magnet is used because of its good magnetic property and accurate dimensions characteristic have obtained widely at numerous areas such as machinery, electronics, automobiles.
Neodymium iron boron magnetic body is divided into two kinds of Agglutinate neodymium-iron-boron magnet and Sintered NdFeB magnets according to the difference of manufacturing process, and both differ greatly at Technology, and the magnetic property difference of magnet is also very big, so Application Areas is also inequality.Boned neodymium iron boron permanent magnet has good magnetic property, and tolerance of dimension is little, is widely used in computer hard disc, CD-ROM drive, and game machine, printer, the automobile micromotor is in the Magnetic Sensor.
Agglutinate neodymium-iron-boron magnet because of containing a large amount of neodymium metals and metallic iron in its composition, if magnet is directly exposed in the malaria, very easily gets rusty.Industrial in order to prevent that Agglutinate neodymium-iron-boron magnet from getting rusty owing to being exposed in the malaria; Agglutinate neodymium-iron-boron magnet is carried out anti-corrosive treatment; this rotproofing mainly is that coating lacquer and thinner is even according to certain ratio allotment; general thinner is " lacquer thinner "; utilize spray gun to be sprayed on magnet surface then through the coating lacquer of thinner dilution; behind hot setting; form layer protecting film on the Agglutinate neodymium-iron-boron magnet surface; by this layer protective membrane Agglutinate neodymium-iron-boron magnet and external environment are completely cut off, thereby improve the erosion resistance of Agglutinate neodymium-iron-boron magnet.This anticorrosion treatment technology has following shortcoming, because contain toxic substances such as benzene and dimethylbenzene in coating lacquer and the thinner, in order to reduce of the injury of these objectionable impuritiess, need utilize multiple subsidiary material such as machine oil, gac and complicated utility appliance that unnecessary coating lacquer is carried out adsorption treatment to the operator; In addition, the volume of general bonded permanent magnet is less, and during to its sprayed coating lacquer, the coating lacquer of considerable part can spray on the wire web plate of placing magnet, and the coating lacquer wasting phenomenon is very serious; And protective membrane and magnet absorption are not firm, easily come off.
Summary of the invention
The technical problem to be solved in the present invention be prior art boned neodymium iron boron permanent magnet is carried out antiseptic method, not firm in protective membrane and magnet absorption that magnet surface forms, the problem that comes off easily;
The method for anticorrosion treatment of prior art contains toxic substances such as benzene and dimethylbenzene in wherein used coating lacquer and the thinner, need unnecessary coating lacquer and thinner be adsorbed, thereby waste of manpower, simultaneously also cause the increase of processing cost;
And the method for anticorrosion treatment of prior art, when the magnet sprayed coating was coated with lacquer, the coating lacquer of considerable part can spray on the wire web plate of placing magnet, caused the problem of coating lacquer waste.
For solving above technical problem, the invention provides a kind of surface anticorrosive treatment method of Agglutinate neodymium-iron-boron magnet, comprise the steps:
Step 1: Agglutinate neodymium-iron-boron magnet is put in the deionized water clean surface dust and foreign material;
Step 2: the Agglutinate neodymium-iron-boron magnet that step 1 was handled is put in the chemical solution and is flooded;
Step 3: the Agglutinate neodymium-iron-boron magnet that step 2 was handled cleans in deionized water, and seasoning or oven dry then generates one deck crystalline film on the surface of Agglutinate neodymium-iron-boron magnet.
Further improvement of the present invention is that in the step 2, the weight proportion of described chemical solution is: phosphoric acid, 70%～88%; Water, 5%～25%; Tensio-active agent, 0.1%～2%; Oxalic acid, 0.5%～3%; Inhibiter, 0.3%～2%.
Further improvement of the present invention is that in the step 2, the weight proportion of chemical solution is: phosphoric acid, 75%～80%; Water, 10%～20%; Tensio-active agent, 0.8%～1.5%; Oxalic acid, 1.5%～2%; Inhibiter, 0.9%～1.5%.
Further improvement of the present invention is that in the step 2, the temperature range of described chemical solution is 30 ℃～50 ℃, and the dipping time of Agglutinate neodymium-iron-boron magnet in chemical solution is 3～10 minutes.
Further improvement of the present invention is that the temperature range of described chemical solution is 37 ℃～42 ℃, and described dipping time scope is 4～7 minutes.
Further improvement of the present invention is that in the step 2, the concentration of described phosphoric acid, oxalic acid is technical purity, and described water is deionized water.
Further improvement of the present invention is, in the step 2, and described glass or plastic containers.
Further improvement of the present invention is that in the step 2, described inhibiter is selected from thiocarbamide or derivatives class inhibiter.
Further improvement of the present invention is that the thickness of described crystalline film is 10～30g/m
2
Method for anticorrosion treatment of the present invention; by magnet is cleaned; remove dust and micro-content organism on the magnet surface; the magnet that will clean is put in the chemical solution then; generate the crystalline film of one deck densification in magnet surface by chemical reaction; this crystalline film has excellent corrosion resisting performance; have good hardness and thermotolerance simultaneously; can play antirust; the effect of wear-resisting and anti-attrition; thereby what solve prior art carries out antiseptic method to boned neodymium iron boron permanent magnet, not firm in protective membrane and magnet absorption that magnet surface forms, the problem that comes off easily.
Further, method for anticorrosion treatment of the present invention does not have toxic substance, compared with prior art, can save the cost that toxic substance is handled, and reduces production costs
And treatment process of the present invention by magnet is put in the chemical solution, with the surface generation crystalline film that is reflected at magnet of chemical solution, avoids a lot of coating lacquers of prior art to spray on the wire web plate, causes the problem of coating lacquer waste.
And the service requirements of the present invention's any routine that can satisfy, be suitable for the large batch of production of related industries.
Description of drawings
Do not have
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with specific embodiment.
The surface anticorrosive treatment method of a kind of Agglutinate neodymium-iron-boron magnet of the specific embodiment of the invention comprises the steps:
Step 1: Agglutinate neodymium-iron-boron magnet is put in the deionized water clean surface dust, foreign material and micro-content organism.In the specific embodiment of the present invention, for raising the efficiency and implementation result, utilize Ultrasonic Cleaners that Agglutinate neodymium-iron-boron magnet is cleaned, scavenging period is 5～10 minutes, and Agglutinate neodymium-iron-boron magnet surface noresidue dust is advisable.In a specific embodiment, magnet is put in the deionized water, utilize Ultrasonic Cleaners to clean 8 minutes.
Step 2: the Agglutinate neodymium-iron-boron magnet that step 1 was handled is put in the chemical solution and is flooded, and floods 3～10 minutes under 30 ℃～50 ℃ temperature.Wherein, the weight proportion of chemical solution is:
Phosphoric acid (H
3PO
4) 70%～88%
Water (H
2O) 5%～25%
Tensio-active agent 0.1%～2%
Oxalic acid 0.5%～3%
Inhibiter 0.3%～2%
The weight proportion of a chemical solution preferred embodiment is:
Phosphoric acid (H
3PO
4) 75%～80%
Water (H
2O) 10%～20%
Tensio-active agent 0.8%～1.5%
Oxalic acid 1.5%～2%
Inhibiter 0.9%～1.5%
The Agglutinate neodymium-iron-boron magnet that step 1 was handled is put in the chemical solution of weight proportion of preferred implementation and is flooded, and floods 4～7 minutes under 37 ℃～42 ℃ temperature.
Phosphoric acid among the present invention, the concentration of oxalic acid all are technical purity, and water is deionized water, and tensio-active agent is a nonionogenic tenside, and inhibiter is selected from thiocarbamide or derivatives class inhibiter.
In a specific embodiment, use the chemical solution proportioning to be:
Phosphoric acid (H
3PO
4) 78%
Water (H
2O) 17.8%
Tensio-active agent 1%
Oxalic acid 2%
Inhibiter 1.2%
Magnet is put in the chemical solution, and dipping is 5 minutes under 40 ℃ of temperature.
Step 3: the magnet that step 2 was handled cleans in deionized water, and seasoning or oven dry then generates one deck crystalline film on the surface of magnet.
By the Agglutinate neodymium-iron-boron magnet after the above-mentioned method processing, magnet surface generates the crystalline film of one deck densification, and thickness is 10～30g/m
2, in one embodiment, the magnet surface crystalline film is 22g/m
2, this crystalline film has excellent corrosion resisting performance, has better hardness and thermotolerance simultaneously, can play antirust, the effect of wear-resisting and anti-attrition.
Agglutinate neodymium-iron-boron magnet after aforesaid method is handled according to the method check that standard GB/T18880-2002 appendix A part " the main rustless property and the test method of Agglutinate neodymium-iron-boron permanent magnet product " is announced, meets or exceeds the requirement of GB fully.
Main experiment content and experiment condition such as table 1:
Table 1
| Performance | Index (GB) | The actual experiment condition | Experimental phenomena | Experimental result |
| Solvent resistance | Be as good as shape | Same GB | No variable color | Qualified |
| Resistance to salt water | 〉=24 hours (h) | Same GB | No burn into peels off, swelling | Qualified |
| High-temp resisting high-humidity resisting | 〉=240 hours (h) | 80 ℃ ± 3 ℃; 90 % relative humidity; 500h | Nothing is got rusty | Qualified |
| Acid resistance | 〉=24 hours (h) | Same GB | No burn into peels off, swelling | Qualified |
| Adherence (tape stripping experiment) | N/D | Same GB | N/D | Qualified |
Method for anticorrosion treatment of the present invention; by magnet is cleaned; remove dust and micro-content organism on the magnet surface; the magnet that will clean is put in the chemical solution then; generate the crystalline film of one deck densification in magnet surface by chemical reaction; this crystalline film has excellent corrosion resisting performance; have good hardness and thermotolerance simultaneously; can play antirust; the effect of wear-resisting and anti-attrition; thereby what solve prior art carries out antiseptic method to boned neodymium iron boron permanent magnet, not firm in protective membrane and magnet absorption that magnet surface forms, the problem that comes off easily.
Further, method for anticorrosion treatment of the present invention does not have toxic substance, compared with prior art, can save the cost that toxic substance is handled, and reduces production costs
And treatment process of the present invention by magnet is put in the chemical solution, with the surface generation crystalline film that is reflected at magnet of chemical solution, avoids a lot of coating lacquers of prior art to spray on the wire web plate, causes the problem of coating lacquer waste.
And the service requirements of the present invention's any routine that can satisfy, be suitable for the large batch of production of related industries.
Be understandable that the detailed description of the foregoing description is in order to set forth and explain principle of the present invention rather than to the qualification of protection scope of the present invention.Under the prerequisite that does not break away from purport of the present invention, one of ordinary skill in the art can be made modification by the understanding to the principle of being instructed of technique scheme on these embodiment bases, changes and changes.Therefore protection scope of the present invention by appended claim with and be equal to and limit.
Claims (9)
1. the surface anticorrosive treatment method of an Agglutinate neodymium-iron-boron magnet is characterized in that, comprises the steps:
Step 1: Agglutinate neodymium-iron-boron magnet is put in the deionized water clean surface dust and foreign material;
Step 2: the Agglutinate neodymium-iron-boron magnet that step 1 was handled is put in the chemical solution and is flooded;
Step 3: the Agglutinate neodymium-iron-boron magnet that step 2 was handled cleans in deionized water, and seasoning or oven dry then generates one deck crystalline film on the surface of Agglutinate neodymium-iron-boron magnet.
2. method for anticorrosion treatment as claimed in claim 1 is characterized in that, in the step 2, the weight proportion of described chemical solution is: phosphoric acid, 70%～88%; Water, 5%～25%; Tensio-active agent, 0.1%～2%; Oxalic acid, 0.5%～3%; Inhibiter, 0.3%～2%.
3. method for anticorrosion treatment as claimed in claim 2 is characterized in that, in the step 2, the weight proportion of chemical solution is: phosphoric acid, 75%～80%; Water, 10%～20%; Tensio-active agent, 0.8%～1.5%; Oxalic acid, 1.5%～2%; Inhibiter, 0.9%～1.5%.
4. as each described method for anticorrosion treatment of claim 1～3, it is characterized in that in the step 2, the temperature range of described chemical solution is 30 ℃～50 ℃, the dipping time of Agglutinate neodymium-iron-boron magnet in chemical solution is 3～10 minutes.
5. method for anticorrosion treatment as claimed in claim 4 is characterized in that, the temperature range of described chemical solution is 37 ℃～42 ℃, and described dipping time scope is 4～7 minutes.
6. method for anticorrosion treatment as claimed in claim 2 is characterized in that, in the step 2, the concentration of described phosphoric acid, oxalic acid is technical purity, and described water is deionized water.
7. method for anticorrosion treatment as claimed in claim 2 is characterized in that, in the step 2, and described glass or plastic containers.
8. method for anticorrosion treatment as claimed in claim 2 is characterized in that, in the step 2, described inhibiter is selected from thiocarbamide or derivatives class inhibiter.
9. method for anticorrosion treatment as claimed in claim 1 is characterized in that, the thickness of described crystalline film is 10～30g/m
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102015373A CN102102201A (en) | 2009-12-21 | 2009-12-21 | Surface preservative treatment for neodymium iron boron bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102015373A CN102102201A (en) | 2009-12-21 | 2009-12-21 | Surface preservative treatment for neodymium iron boron bonded magnet |
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| Publication Number | Publication Date |
|---|---|
| CN102102201A true CN102102201A (en) | 2011-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102015373A Pending CN102102201A (en) | 2009-12-21 | 2009-12-21 | Surface preservative treatment for neodymium iron boron bonded magnet |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877058A (en) * | 2012-10-31 | 2013-01-16 | 四川职业技术学院 | Method for rust prevention of surface of neodymium iron boron magnet |
| CN105097260A (en) * | 2014-05-08 | 2015-11-25 | 惠州铂科磁材有限公司 | Rust protection method for magnetic core |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299708A (en) * | 2001-01-22 | 2001-06-20 | 孙泉 | Pre-cleaning process of Nd-Fe-B permanent magnet surface to be coated with anticorrosive p-xylene polymer layer |
| JP3475041B2 (en) * | 1996-09-30 | 2003-12-08 | 株式会社日立製作所 | Solution for forming insulating layer of magnetic powder for dust core, method of forming insulating layer, dust core using the same, and electric device using the dust core |
-
2009
- 2009-12-21 CN CN2009102015373A patent/CN102102201A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3475041B2 (en) * | 1996-09-30 | 2003-12-08 | 株式会社日立製作所 | Solution for forming insulating layer of magnetic powder for dust core, method of forming insulating layer, dust core using the same, and electric device using the dust core |
| CN1299708A (en) * | 2001-01-22 | 2001-06-20 | 孙泉 | Pre-cleaning process of Nd-Fe-B permanent magnet surface to be coated with anticorrosive p-xylene polymer layer |
Non-Patent Citations (2)
| Title |
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| 姜力强等: "烧结钕铁硼在各种酸介质中的腐蚀研究", 《稀有金属材料与工程》 * |
| 王左才等: "浸涂/喷涂涂装在粘结钕铁硼表面防腐上的应用", 《表面技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877058A (en) * | 2012-10-31 | 2013-01-16 | 四川职业技术学院 | Method for rust prevention of surface of neodymium iron boron magnet |
| CN105097260A (en) * | 2014-05-08 | 2015-11-25 | 惠州铂科磁材有限公司 | Rust protection method for magnetic core |
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| PB01 | Publication | ||
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Application publication date: 20110622 |