CN100398615C - Coating process for neodymium-iron-boron permanent magnetic material - Google Patents
Coating process for neodymium-iron-boron permanent magnetic material Download PDFInfo
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- CN100398615C CN100398615C CNB2005100188666A CN200510018866A CN100398615C CN 100398615 C CN100398615 C CN 100398615C CN B2005100188666 A CNB2005100188666 A CN B2005100188666A CN 200510018866 A CN200510018866 A CN 200510018866A CN 100398615 C CN100398615 C CN 100398615C
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Abstract
The present invention provides dual-component paint which is used for coating Nd-Fe-B permanent magnetic materials and uses inorganic substances as major components. The present invention is prepared by mixing inorganic resin A and metal particles B and is added with various additive agents. The present invention is diluted by deionized water, and has the advantages of no pollution to environment and high film coating performance.
Description
Technical field
The present invention relates to paint spraying, particularly relate to rare earth permanent-magnetic material application coating material.
Background technology
Nd-Fe-Bo permanent magnet material has brought rapid variation to the permanent magnetism industry as main, the most important product of rare earth permanent-magnetic material over 20 years, but sintered NdFeB is a mmaterial, easily loses efficacy, and must carry out protective treatment.This processing will be safeguarded its life-time service stability.Its existing maintenance is handled plating, electrophoresis, vacuum moulding machine and paint spraying etc.Wherein with electroplate, electrophoresis is in the majority, but these two kinds of method serious environment pollutions, the protection life-span is also lacked (about 3～5 years).In order to replace them, occurred in recent years environment coating protection method more friendly, that solidity to corrosion is higher.But, existing coating protection method, for example, epoxy coating will be used organic solvent, and coating adhesion is not high, and the heatproof oxidation resistent susceptibility is relatively poor, easily comes off in hygrothermal environment.The employing vapour deposition p-Xylol or the vacuum deposited aluminum that have, its efficient is low, cost is high.
Summary of the invention
The objective of the invention is to propose a kind of more friendly to environment, than the better coating process of organic coating performance.
In order to reach above purpose of the present invention, the present invention proposes with the inorganics is the inorganic paint of main component.Its essentially consist comprises metal fine powder or little scale weight percent 10%～60%, corrosion-resistant inorganics weight percent 20%～40%, rust-inhibiting additive, various auxiliary agent weight percent 5%～20%, thinner weight percent 1%～10%, remaining solvent water.
Metal fine powder or little scale can be zinc powder, zinc scale or aluminium micro mist or aluminium scale, also can be the alloy powders of zinc and aluminium, or its three's mixture.Can also add some other more active metal fine powders.Zinc has its unique characteristics, and its standard potential is that (0.76V), (being active 0.44V), is most important electrochemistry rust-stabilising pigment, and zinc can be melted and process and be cleaned into fine grain high purity zinc powder than iron.Film when suffering erosion, zinc powder is corroded earlier as anode, and the base material iron and steel is a negative electrode, is subjected to galvanic protection, and zinc powder is consumed gradually with jogging speed very in the protection process, and the corrosion of zinc-rich coating can not spread towards periphery from injury region.
Corrosion-resistant inorganics can be selected from silicate, phosphoric acid salt, for example the lithium silicate aqueous solution (lithium silicate), also can be water glass, potassium silicate, lithium silicate and silicon sol or polyphosphoric acid salt.
Add various auxiliary agents such as dispersion agent, defoamer, thickening material.Rust-inhibiting additive can be nitrite, silicoorganic compound and organic phosphine compound.Thinner can be organic solvents such as ethanol, Virahol, vinylformic acid, and non-stimulated, volatility is atomic, mainly plays the hydrotropy effect.
The invention belongs to a kind of two-component coating, mixed by inorganic resin A and metal particle B, its weight proportion is A: B=0.5～1 to 0.5～3, other adds various additives, dilutes with deionized water.Inorganic resin A can be: water glass, potassium silicate, lithium silicate and silicon sol or polyphosphoric acid salt, and as lithium silicon sol, Sodium hexametaphosphate 99.The weight percent of inorganic resin in whole coating must not be less than 5%～10%.In the liquid constituent, weight percent must not be lower than 20%.Also mixed thickening material weight percent 0.1%～1% hydro-polyacrylamide, or inorganic silicon compound.Mixed silane coupling agent, addition weight percent 0.05%～0.5%.
By proportioning compounding agent solutions such as deployed thickening material, dispersion agent, defoamer are added in inorganic resin such as the silicon sol, stirred 30～60 minutes, generate uniform mixture solution, stir on the limit, the limit slowly is added dropwise to coupling agent, continues to stir to get final product in 1～2 hour.Metal fine powder B and a spot of dispersion agent mix by mixing equipment.During adapted, B is under agitation slowly added in the A material, added the back restir 40～90 minutes, temperature is controlled at 20～40 ℃ during mixing.Filter, generate mixture at last.
After each component is mixed in proportion, can spray, brush in the protected object surface.The surface of workpiece needs to carry out sandblast or shot peening with the anhydrous free of contamination high-quality abrasive material of nothings such as steel sand, emergy oil before application.Fineness of sand is 0.2～1.2mm, and corundum can produce the good surface roughness effect at 0.5～1.8mm, and gun slot pressure requires 6～7bar, the use air pressure 0.2MPa～0.4MPa when having gas blowout to be coated with.
After the sandblast, can remove the dust and the adhered particles on surface, fully contact with steel surface, keep good electrical conductivity, must carry out sandblasting to Sa 2 magnet surface in order to guarantee zinc powder with brush or pressurized air
1/
2(ISO8501-1:1988).Roughness reaches the thick middle rank (G) among the ISO 8503.Roughness is too low, and coating adhesion can reduce, and increases the possibility of Alligatoring.The not handy hand of workpiece surface after the processing touches.The overlay painting interval time is preferably in the 4h.When brushing, roller coating, preferably stirred once every 10～15 minutes, heavy poly-to prevent metal fine powder.When adopting airless spraying, answer supporting corresponding stirring storage tank, and construction while stirring.Wait to film (25 ℃ of normal temperature, 4 hours) after the thorough drying, can obtain surface hardness height (pencil hardness reaches more than the 6H), wear-resisting anti-scraping, outdoor weatherability is good, water tolerance, and nondiscoloration is strong with steel product surface bonding power, free of contamination high anti-corrosion coating.
This coating can adopt Airless spraying, have gas blowout to be coated with, to brush, and is best with spraying.It is characterized in that: during spraying, workpiece surface temperature and envrionment temperature should be greater than 5 ℃, and relative humidity should be less than 90%, and the best build of spraying is 20 μ m～50 μ m.When adopting Airless spraying, require to wear stirring storage tank, rotary spray gun rifle mouth.
Its performance index are that the zinc content of coating dry film is up to more than 90%.Outward appearance: zinc gray look; Viscosity (being coated with-4 glasss) 20～45S, theoretical solids content 〉=70%, time of drying, (25 ± 1 ℃, relative humidity 65 ± 5%) were surface drying≤10～30min, did solid work to be 24h; Thickness 15～65 μ m/ roads; Pencil hardness is 6H; Coating adhesion≤1 grade; Shock-resistance is 50kg.cm; Salt-fog resistant test (50 μ) 〉=1000h, hot resistance test 〉=1000h; High thermal resistance≤500 ℃
Product primary coating rust-proof life of the present invention surpasses 10 years, is applicable to Nd-Fe-Bo permanent magnet material long-effective corrosion protection processing.
Embodiment
Following examples can further specify characteristics of the present invention, but do not limit application of the present invention.
Embodiment 1
A expects to form: potassium silicon sol weight percent 40%, hydro-polyacrylamide (molecular-weight average 5,000,000) weight percent 0.1%, tetramethoxy-silicane weight percent 0.05%, organic silicone defoamer weight percent 0.01%, Sodium Nitrite weight percent 0.1%;
B expects to form: zinc powder 50%, ethanol 2.5%;
Respectively A material, B material are mixed, the B material slowly is dispensed in the A material again, temperature is controlled at below 30 ℃ during mixing.Disperse after-filtration, utilize this coating to apply 3.5 hours after drying of N35 Nd-Fe-B rare earth permanent magnetic material of 40 * 50 * 10mm, the surface is grey evenly, thickness 25 μ m, sticking power≤1 grade, neutral salt spray test ≮ 800h.
Embodiment 2
The potassium silicon sol is 30% in the A material of embodiment 1, and with 1,2-two methene phosphonic acids 0.06% replace Sodium Nitrite, and it is constant that other form content, and the B material is also identical.This coating applies the N35 Nd-Fe-Bo permanent magnet material of 40 * 50 * 10mm, 3 hours after drying, and the surface is grey evenly, thickness 30 μ m, sticking power≤1 grade, neutral salt spray test ≮ 1000h.
Embodiment 3
Being changed to the lithium silicon sol in the A material of embodiment 2 is 30%, and it is constant that all the other form content.
B expects to form zinc powder 35%, the little scale 10% of zinc, vinylformic acid 5%; This coating applies the N35 Nd-Fe-B rare earth permanent magnetic material of 40 * 50 * 10mm, 2.5 hours after drying, and the surface is evenly light grey, thickness 25 μ m, sticking power≤1 grade, neutral salt spray test ≮ 1000h.
Replace traditional plating and cataphoretic coating with coating technology of the present invention, improved the corrosion-resistant life of product greatly, the quality fluctuation that has overcome existing guard method is big, is difficult to stable problem.Coating of the present invention has good and economic and performance ratio.
Product advantage of the present invention is: (1) has good security, and it is water-based, nontoxic, Do not contain organic volatile substance, human body is not caused murder by poisoning, belong to environment-friendly type coating, not spontaneous combustion is executed Worker, storage safe, (2) have good wearability, and coating adhesion reaches as high as 0 after solidifying Level, the friction resistant coefficient is near general iron and steel, (3) corrosion resistance, alkaline-resisting, salt spray resistance, moisture-proof Hot property is good, (4) heat resistanceheat resistant cold resistance, and heat-resisting 400 ℃ can not burn, low temperature resistant, and-20 ℃ unchanged, (5) pollution resistance, film after the drying have good resistance to water, oil resistivity, anti-Solvent borne, fine with the compatibility of organic resin, (6) coating self is not magnetized, no magnetic screen The property impact, (7) are long-lasting, and the durable degree of coating was eliminated the Nd-Fe-B permanent magnetic material more than 10 years The trouble and worry of material, because accidental impact or hard sharp weapon cause coating damage, the crackle indiffusion, Coating is not peeled off on every side, and can carry out body and repair, and material for repairing and the automatic adhesion of old coating are very Height is good with other corrosion-inhibiting coating aspect lacquer matching.
Claims (3)
1. coating process for neodymium-iron-boron permanent magnetic material, it is characterized in that it is a kind of two combination part coating, by the inorganic resin A that comprises water glass, potassium silicate, lithium silicate, silicon sol, polyphosphoric acid salt with comprise zinc powder, aluminium micro mist, the metal particle B of zinc scale, aluminium scale mixes and forms, mixed weight is than being A: B=0.5～1 to 0.5～3, other adds various additives, dilutes with deionized water.
2. by the described a kind of coating process for neodymium-iron-boron permanent magnetic material of claim 1, it is characterized in that inorganic resin A coating process for neodymium-iron-boron permanent magnetic material be coated with whole coating in weight percent must not be less than 5%, in the coating process for neodymium-iron-boron permanent magnetic material solution composition, must not be lower than weight percent 20%.
3. by the described a kind of coating process for neodymium-iron-boron permanent magnetic material of claim 1, it is characterized in that having added among the inorganic resin A weight percent 0.1%～1% hydro-polyacrylamide, inorganic silicon compound thickening material, and weight percent 0.05%～0.5% silane coupling agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100188666A CN100398615C (en) | 2005-06-07 | 2005-06-07 | Coating process for neodymium-iron-boron permanent magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100188666A CN100398615C (en) | 2005-06-07 | 2005-06-07 | Coating process for neodymium-iron-boron permanent magnetic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1749329A CN1749329A (en) | 2006-03-22 |
| CN100398615C true CN100398615C (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100188666A Expired - Fee Related CN100398615C (en) | 2005-06-07 | 2005-06-07 | Coating process for neodymium-iron-boron permanent magnetic material |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104449291A (en) * | 2008-03-31 | 2015-03-25 | 帝斯曼知识产权资产管理有限公司 | Coating composition comprising autoxidisable component |
| CN101397412B (en) * | 2008-09-17 | 2011-09-28 | 天津中航百慕新材料技术有限公司 | VCI-containing flake zinc and aluminum protective coating on galvanizing surface and preparation method thereof |
| CN102031052B (en) * | 2009-09-29 | 2012-10-10 | 沈阳中北通磁科技股份有限公司 | Neodymium iron boron rare earth permanent magnet surface coating and application method thereof |
| CN102397836B (en) * | 2010-09-10 | 2015-05-20 | 北京中科三环高技术股份有限公司 | Surface treatment method for spraying organoaluminum on permanent magnet |
| US9017464B2 (en) * | 2012-11-09 | 2015-04-28 | Praxair S.T. Technology, Inc. | Chromium-free silicate-based ceramic compositions |
| 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 |
| CN104008874B (en) * | 2013-09-18 | 2016-10-26 | 中磁科技股份有限公司 | Neodymium-iron-boron permanent magnetic material surface means of defence |
| CN104177877B (en) * | 2014-03-14 | 2016-08-24 | 哈尔滨蕴力达科技开发有限公司 | A kind of inorganic silicate coating having pliability and thermostability concurrently |
| CN104148256B (en) * | 2014-07-10 | 2016-06-29 | 北京京磁电工科技有限公司 | A kind of painting method of neodymium iron boron magnetic body |
| CN104502275A (en) * | 2015-01-06 | 2015-04-08 | 南通太平洋海洋工程有限公司 | Type selection method of low-temperature and anti-corrosion coating on outer surface of liquid tank of gas transportation ship |
| CN105368100B (en) * | 2015-12-02 | 2017-09-19 | 中国科学院宁波材料技术与工程研究所 | Coating liquid, coating for the modification of magnetic material surface and preparation method thereof |
| CN105623501B (en) * | 2016-03-23 | 2018-05-15 | 常州耀辉新材料科技有限公司 | Environment-friendly acid-resistant high temperature resistant polymeric coatings |
| CN111940266A (en) * | 2020-04-10 | 2020-11-17 | 中磁科技股份有限公司 | Coating process of neodymium iron boron product |
Citations (4)
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|---|---|---|---|---|
| US5273782A (en) * | 1991-08-09 | 1993-12-28 | Intermetallics Co., Ltd. | Coated parts with film having powder-skeleton structure, and method for forming coating |
| JPH09205013A (en) * | 1996-01-25 | 1997-08-05 | Daidoo Denshi:Kk | Bond magnet having rust-resistant coat layer and its rust-resistant coating method |
| JPH10226890A (en) * | 1997-02-19 | 1998-08-25 | Daidoo Denshi:Kk | Rust inhibiting method of rare-earth magnet |
| CN1336672A (en) * | 2000-07-31 | 2002-02-20 | 冲微型技研株式会社 | High corrosion-resistant type Nd-Fe-B magnetic iron |
-
2005
- 2005-06-07 CN CNB2005100188666A patent/CN100398615C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5273782A (en) * | 1991-08-09 | 1993-12-28 | Intermetallics Co., Ltd. | Coated parts with film having powder-skeleton structure, and method for forming coating |
| JPH09205013A (en) * | 1996-01-25 | 1997-08-05 | Daidoo Denshi:Kk | Bond magnet having rust-resistant coat layer and its rust-resistant coating method |
| JPH10226890A (en) * | 1997-02-19 | 1998-08-25 | Daidoo Denshi:Kk | Rust inhibiting method of rare-earth magnet |
| CN1336672A (en) * | 2000-07-31 | 2002-02-20 | 冲微型技研株式会社 | High corrosion-resistant type Nd-Fe-B magnetic iron |
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