CN103611667B - Water-based inorganic-and-organic composite coating double-layer protection method for surface of Nd-Fe-B magnet material - Google Patents
Water-based inorganic-and-organic composite coating double-layer protection method for surface of Nd-Fe-B magnet material Download PDFInfo
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- CN103611667B CN103611667B CN201310629312.4A CN201310629312A CN103611667B CN 103611667 B CN103611667 B CN 103611667B CN 201310629312 A CN201310629312 A CN 201310629312A CN 103611667 B CN103611667 B CN 103611667B
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- 238000000576 coating method Methods 0.000 title claims abstract description 162
- 239000011248 coating agent Substances 0.000 title claims abstract description 159
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 title abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 49
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 42
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 36
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 36
- 239000003973 paint Substances 0.000 claims description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 24
- 239000000696 magnetic material Substances 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 20
- 239000004411 aluminium Substances 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 239000010936 titanium Substances 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 20
- IVKNZCBNXPYYKL-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 IVKNZCBNXPYYKL-UHFFFAOYSA-N 0.000 claims description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 18
- 239000004115 Sodium Silicate Substances 0.000 claims description 18
- 239000003995 emulsifying agent Substances 0.000 claims description 18
- 229910017604 nitric acid Inorganic materials 0.000 claims description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 18
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 18
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 18
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005238 degreasing Methods 0.000 claims description 15
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 12
- 229910000077 silane Inorganic materials 0.000 claims description 12
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 229920005749 polyurethane resin Polymers 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- 239000011256 inorganic filler Substances 0.000 claims description 3
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 23
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 18
- 230000007935 neutral effect Effects 0.000 abstract description 13
- 150000003839 salts Chemical class 0.000 abstract description 13
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- 238000009713 electroplating Methods 0.000 abstract description 4
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- -1 then Substances 0.000 abstract 2
- 238000007781 pre-processing Methods 0.000 abstract 1
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- 239000007921 spray Substances 0.000 description 12
- 125000002370 organoaluminium group Chemical group 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000013530 defoamer Substances 0.000 description 7
- 239000002270 dispersing agent Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- 230000002378 acidificating effect Effects 0.000 description 6
- 238000004900 laundering Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 3
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
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- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the field of surface protection on Nd-Fe-B magnet materials, in particular to a water-based inorganic/organic composite coating double-layer protection method for the surface of an Nd-Fe-B magnet material. The water-based inorganic/organic composite coating double-layer protection method for the surface of the Nd-Fe-B magnet material comprises the steps of firstly, carrying out oil removal, rust removal and sanding on the Nd-Fe-B magnet material, then, coating the Nd-Fe-B magnet material with a water-based inorganic coating material to form an inorganic coating, and finally, coating the Nd-Fe-B magnet material with a water-based organic coating material to form an organic coating. According to the water-based inorganic/organic composite coating double-layer protection method for the surface of the Nd-Fe-B magnet material, in order to solve the problem that in the prior art, some surface protection methods such as the electroplating method, the chemical plating method and the solvent type coating method are complex in pre-processing, strict, serious in pollution, poor in anticorrosion performance and the like, water-based inorganic/organic composite coating double-layer protection is adopted, the problem that pollution is caused by protection of the Nd-Fe-B magnet material is solved, limitation in the aspect of application is removed, and the neutral salt fog corrosion resistance performance of the coatings is improved to a great extent on the premises that binding force between the coatings and a base body is ensured, and magnetic performance is not influenced.
Description
Technical field
The present invention relates to the surfacecti proteon field of Nd-Fe-B magnetic material, be specially a kind of Nd-Fe-B magnetic material aqueous surface inorganic/method of organic composite coating Double-protection.
Background technology
From nineteen eighty-three, since assistant river true man find neodymium iron boron magnetic body, because characteristic and the more traditional permanent-magnet material of cost performance of Sintered NdFeB magnet are excellent, be widely used in all trades and professions such as computer, motor, wind-driven generator, electric automobile, instrument and meter, magnetic drive bearing, high-fidelity loudspeaker, NMR imaging instrument and space flight and aviation omniselector, in emerging technology fields such as magnetic suspension trains, there is huge potential application foreground.China relies on rare earth resources advantage and production cost advantage, greatly develops neodymium iron boron magnetic body industry, has become the first in the world big producing country and consumption big country.
But, because Nd-Fe-B materials chemistry is active strong, corrosion-resistant, easily oxidized, cause its magnetic property to reduce, have a strong impact on its range of application.In order to improve Nd-Fe-B rare-earth permanent magnet surface oxidation-resistant decay resistance, people also start with from changing the compositions such as microstructure, interpolation Mo or Co+V, do a lot of work, but up to the present, relatively effective method still adopts face coat technology, by coating, stops air, moisture or other corrosive substance to permeate to improve the resistance to corrosion of magnet.
Existing surface treatment has plating, chemical plating, electrophoresis, vacuum moulding machine, paint spraying etc.; except single protective layer; also has the appearance of composite coating; such as: the English of defending the country, Ge Hongliang etc., a kind of protection new technology [P] of plating multilayer coating on surface of sintered Nd-Fe-B permanent magnet, Chinese invention patent; application number: 200810164199.6; carry out the Protective Research of neodymium iron boron surface multilayer coating, but at least will more than three layers just can reach better resistance to neutral salt spray performance, technique more complicated.Lin Fuwen, Wang Yue etc., the method [P] of the double-deck zn-ni alloy deposits of a kind of neodymium iron boron electroplating surface, Chinese invention patent, application number 200510048456.6, carried out the research to neodymium iron boron surface Duplex plating admiro, also be after two-layer plating, carry out passivation or soak insulated paint, more complicated operates.At present, the surface treatment of neodymium iron boron is mainly that it is main electroplating with chemical plating, and the corrosion resisting property of its coating is still in lower standard, but processing procedure is comparatively strict and complicated.
Therefore, have a kind of environmental protection to be developed, technique is simple, coating is thin, corrosion resisting property is good, guarantee the impregnable coating of adhesion, magnetic property of coating and matrix.
Summary of the invention:
For current plating, chemical plating, some process for protecting surface such as composite coating, seriously polluted and cannot meet neodymium iron boron in the problem such as rugged environment application comparatively, the object of this invention is to provide a kind of Nd-Fe-B magnetic material aqueous surface inorganic/method of organic composite coating Double-protection, adopt the process for treating surface of aqueous inorganic/organic composite coating Double-protection, the pollution problem of neodymium iron boron protection and the restriction in application have been solved, and in the adhesion that guarantees coating and matrix, under the impregnable prerequisite of magnetic property, improve largely the resistance to neutral salt spray corrosive nature of coating.
Technical scheme of the present invention is:
The inorganic organic composite coating Double-protection of a Nd-Fe-B magnetic material aqueous surface method, first, to neodymium iron boron oil removing, rust cleaning, sand papering; Then, neodymium iron boron is applied to one deck aqueous inorganic paint, form inorganic coating; Afterwards, then apply one deck water-based organic coating, be formed with organic coating.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 3～15g/L; Sodium carbonate 20～80g/L; Tertiary sodium phosphate 50～100g/L; Sodium metasilicate 5～15g/L; OP-10 emulsifying agent 0.2～3g/L; All the other are water.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 2～10g/L; Nitric acid 20～80g/L; All the other are water.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, sand papering is first roughly ground with 150#, then uses 600# sand papering.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, by weight percentage, composition and the content range of aqueous inorganic paint are as follows:
Ethyl orthosilicate 5～15; Silane KH560:3～10; Zinc powder 15～30; Aluminium powder 4～10; Titanium valve 2～5; Aluminium oxide 1～4; Ethanol 5～20; All the other are water.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, by weight percentage, composition and the content range of water-based organic coating are as follows:
Water-based organic resin 10～60; Filler 3～25; Auxiliary agent 0.3～3; All the other are water.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, the filler of water-based organic coating is one or more inorganic fillers in aluminium powder, titanium valve, zinc powder, silica, aluminium oxide, zinc oxide, ferrotitanium powder, iron oxide red, copper powder, and the granularity of filler is 1000～2000 orders.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, water-based organic resin is one or more in aqueous epoxy resins, water-borne acrylic resin, water-based fluorocarbon resin, waterborne polyurethane resin.
The described inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface method, the thickness of aqueous inorganic coating is 5～15 μ m, the thickness of water-based organic coating is 3～10 μ m, and aqueous inorganic coating and water-based organic coating gross thickness are at 10～17 μ m.
Advantage of the present invention and beneficial effect:
1, the present invention adopts aqueous inorganic coating as bottom, coating Chrome-free, without toxic solvent, heavy metal free, pollutes, and than electroplating and Dacroment has certain superiority, and coating is thin, even if do not add confining bed, does not also have good corrosion resisting property.
2, the present invention adopts water-based organic coating as confining bed, has improved largely corrosion resisting property and the anti-wear performance of coating.
3, coating matching system of the present invention is perfect, and aqueous inorganic coating and basal body binding force are better, but adhesion between organic coating and water-based organic coating is greater than the adhesion between aqueous inorganic coating and matrix, shows good performance.
In a word, the present invention is in aqueous inorganic coating and water-based organic coating gross thickness during at 10～17 μ m, guaranteeing under the impregnable prerequisite of adhesion, potential difference of coating and matrix, there is better decay resistance, there is not corrosion in the resistance to neutral salt spray time, the even resistance to neutral salt spray time can reach 1500h corrosion does not occur more than 900h.
The specific embodiment
Nd-Fe-B magnetic material aqueous surface of the present invention is inorganic/method of organic composite coating Double-protection, first to neodymium iron boron oil removing, rust cleaning, sand papering; Then, neodymium iron boron is applied to one deck aqueous inorganic paint, form inorganic coating, coating layer thickness is that 5～15 μ m(are preferably 5～10 μ m); Afterwards, then apply one deck water-based organic coating, solidify to form organic coating, coating layer thickness is that 3～10 μ m(are preferably 3～7 μ m), aqueous inorganic coating and water-based organic coating gross thickness are at 10～17 μ m.
In the present invention, aqueous inorganic paint solidification temperature is 250 ℃ to 350 ℃, and the time is 10 minutes～90 minutes.Water-based organic coating solidification temperature is 100 ℃ to 260 ℃, and the time is 10 minutes～60 minutes.
The selected degreasing fluid of the present invention is mixed with water by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent etc., and the content of each component is as follows:
NaOH 3～15g/L; Sodium carbonate 20～80g/L; Tertiary sodium phosphate 50～100g/L; Sodium metasilicate 5～15g/L; OP-10 emulsifying agent 0.2～3g/L; All the other are water.
The selected rust removing solution of the present invention is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 2～10g/L; Nitric acid 20～80g/L; All the other are water.
The present invention polishes and first with 150#, roughly grinds neodymium iron boron sand for surface paper, then uses 600# sand papering.
In the present invention, the composition of aqueous inorganic paint and content range following (by weight percentage):
Ethyl orthosilicate 5～15; Silane KH560:3～10; Zinc powder 15～30; Aluminium powder 4～10; Titanium valve 2～5; Aluminium oxide 1～4; Ethanol 5～20; All the other are water.Wherein, the granularity of zinc powder, aluminium powder, titanium valve, aluminium oxide is 1000～2000 orders.
The present invention adopts specific aqueous inorganic paint, the design philosophy of its composition is: in water-based system, aluminum zinc powder is because existing potential difference easily to produce galvanic corrosion, here utilize ethyl orthosilicate and silane KH560 hydrolysis to carry out surface treatment to aluminum zinc powder, suppressed preferably galvanic corrosion, slowed down the corrosion of zinc-aluminium, adding of titanium valve and aluminium oxide is to improve coating current potential, improves coating pattern.In addition, ethyl orthosilicate and silane KH560 have filming function, through oversintering, can obtain fine and close inorganic coating.
In the present invention, the composition of water-based organic coating and content range following (by weight percentage):
Water-based organic resin 10～60; Filler 3～25; Auxiliary agent 0.3～3; All the other are solvent.
The selected water-based organic resin of the present invention is one or more in aqueous epoxy resins, water-borne acrylic resin, water-based fluorocarbon resin, waterborne polyurethane resin.
The filler of the organic coating that the present invention is selected is one or more inorganic fillers in aluminium powder, titanium valve, zinc powder, silica, aluminium oxide, zinc oxide, ferrotitanium powder, iron oxide red, copper powder, and the granularity of filler is 1000～2000 orders.
The selected auxiliary agent of the present invention is auxiliary agent conventional in organic coating, as: dispersant, levelling agent, defoamer etc.
The present invention adopts specific water-based organic coating, and the design philosophy of its composition is that this formula adopts filler and the specific water-base resin that particle diameter is little, and inorganic coating is had to good sealing process.
Aqueous inorganic coating of the present invention and water-based organic coating form the Double-protection to Nd-Fe-B magnetic material, wherein: aqueous inorganic coating is to change matrix current potential, and utilizes forming silane film to have good adhesion; Water-based organic coating role is to bottom sealing, produces potential difference with aqueous inorganic paint.It is good that the two synergy is issued to adhesion, and coating is fine and close, the effect that resistance to neutral salt spray is good.
Embodiment 1:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 10g/L; Sodium carbonate 20g/L; Tertiary sodium phosphate 50g/L; Sodium metasilicate 5g/L; OP-10 emulsifying agent 0.2g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 2g/L; Nitric acid 80g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 10; Silane KH560:4; Zinc powder 20(1000 order); Aluminium powder 8(1000 order); Titanium valve 2(1000 order); Aluminium oxide 1(1000 order); Ethanol 8; All the other are water.
The sample having sprayed is solidified at 300 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 7～9 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organo-aluminium coating, by weight percentage, the present embodiment water-based organo-aluminium coating is evenly mixed by following component:
Aqueous epoxy resins 30; Aluminium powder 15(1000 order); Dispersant (the German Bi Ke BYK-346 of chemical company) 0.3; Levelling agent (the German Bi Ke BYK-420 of chemical company) 0.4; Defoamer (the German Bi Ke BYK-019 of chemical company) 0.2; All the other are water.
Then, solidify 30-60min at 240 ℃, take out, coating is prepared complete, and the thickness of coating is 4～7 μ m, and total coating thickness is at 11～16 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 1300h of resistance to neutral salt spray.
Embodiment 2:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 12g/L; Sodium carbonate 60g/L; Tertiary sodium phosphate 70g/L; Sodium metasilicate 10g/L; OP-10 emulsifying agent 2g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 6g/L; Nitric acid 70g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 11; Silane KH560:6; Zinc powder 15(1200 order); Aluminium powder 10(1200 order); Titanium valve 3(1200 order); Aluminium oxide 3(1200 order); Ethanol 16; All the other are water.
The sample having sprayed is solidified at 320 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 6～8 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organic zinc, aluminium paint, by weight percentage, the present embodiment water-based organic zinc, aluminium paint are evenly mixed by following component:
Water-borne acrylic resin 20; Epoxy resin 20; Zinc powder 7(1200 order); Aluminium powder 13(1200 order); Dispersant (the German Bi Ke BYK-346 of chemical company) 0.4; Levelling agent (the German Bi Ke BYK-420 of chemical company) 0.5; Defoamer (the German Bi Ke BYK-020 of chemical company) 0.3; All the other are water.
Then, solidify 30-40min at 230 ℃, take out, coating is prepared complete, and the thickness of coating is 5～8 μ m, and total coating thickness is at 11～16 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 1200h of resistance to neutral salt spray.
Embodiment 3:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 10g/L; Sodium carbonate 50g/L; Tertiary sodium phosphate 60g/L; Sodium metasilicate 7g/L; OP-10 emulsifying agent 3g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 8g/L; Nitric acid 60g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 13; Silane KH560:5; Zinc powder 18(1500 order); Aluminium powder 7(1500 order); Titanium valve 3(1500 order); Aluminium oxide 3(1500 order); Ethanol 20; All the other are water.
The sample having sprayed is solidified at 290 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 7～9 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organic titanium coating, by weight percentage, the present embodiment water-based organic titanium coating is evenly mixed by following component:
Waterborne polyurethane resin 10; Water-borne acrylic resin 30; Titanium valve 8(1500 order); Dispersant (the German Bi Ke BYK-333 of chemical company) 0.5; Levelling agent (the German Bi Ke BYK-425 of chemical company) 0.3; Defoamer (the German Bi Ke BYK-028 of chemical company) 0.2; All the other are water.
Then, solidify 20-40min at 120 ℃, take out, coating is prepared complete, and the thickness of coating is 5～7 μ m, and total coating thickness is at 12～16 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 1000h of resistance to neutral salt spray.
Embodiment 4:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 5g/L; Sodium carbonate 65g/L; Tertiary sodium phosphate 80g/L; Sodium metasilicate 10g/L; OP-10 emulsifying agent 0.7g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 3g/L; Nitric acid 75g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 8; Silane KH560:10; Zinc powder 20(1800 order); Aluminium powder 7(1800 order); Titanium valve 2(1800 order); Aluminium oxide 4(1800 order); Ethanol 16; All the other are water.
The sample having sprayed is solidified at 280 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 6～9 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organo-aluminium, silica coating, by weight percentage, the present embodiment water-based organo-aluminium, silica coating are evenly mixed by following component:
Water-based fluorocarbon resin 20; Aluminium powder 19(1800 order); Silica 3(1800 order); Dispersant (the German Bi Ke BYK-346 of chemical company) 0.6; Levelling agent (the German Bi Ke BYK-420 of chemical company) 0.2; Defoamer (the German Bi Ke BYK-020 of chemical company) 0.3; All the other are water.
Then, solidify 20-30min at 100 ℃, take out, coating is prepared complete, and the thickness of coating is 5～7 μ m, and total coating thickness is at 11～16 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 1300h of resistance to neutral salt spray.
Embodiment 5:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 8g/L; Sodium carbonate 65g/L; Tertiary sodium phosphate 85g/L; Sodium metasilicate 9g/L; OP-10 emulsifying agent 0.5g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 5g/L; Nitric acid 60g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 10; Silane KH5605; Zinc powder 20(1600 order); Aluminium powder 8(1600 order); Titanium valve 3(1600 order); Aluminium oxide 4(1600 order); Ethanol 16; All the other are water.
The sample having sprayed is solidified at 310 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 6～7 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organo-aluminium, aluminium oxide coating, by weight percentage, the present embodiment water-based organo-aluminium, aluminium oxide coating are evenly mixed by following component:
Aqueous epoxy resins 15; Waterborne polyurethane resin 10; Aluminium powder 15(1600 order); Alumina powder 5(1600 order); Dispersant (the German Bi Ke BYK-346 of chemical company) 0.4; Levelling agent (the German Bi Ke BYK-420 of chemical company) 0.3; Defoamer (the German Bi Ke BYK-019 of chemical company) 0.3; All the other are water.
Then, solidify 10-30min at 190 ℃, take out, coating is prepared complete, and the thickness of coating is 4～6 μ m, and total coating thickness is at 10～13 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 1000h of resistance to neutral salt spray.
Embodiment 6:
First, prepare sample, neodymium iron boron (50mm * 50mm * 5mm) is carried out to oil removing in alkaline degreasing liquid, with a large amount of water, clean up afterwards, then in acidic derusting liquid, eliminate rust, after massive laundering is dry, with 150# sand paper, polish, with 600# sand paper, polish again, use afterwards alcohol neodymium iron boron surface wiped clean.
Degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 7g/L; Sodium carbonate 30g/L; Tertiary sodium phosphate 55g/L; Sodium metasilicate 13g/L; OP-10 emulsifying agent 0.9g/L; All the other are water.
Rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 6g/L; Nitric acid 75g/L; All the other are water.
By ready neodymium iron boron sample spraying one deck aqueous inorganic paint, by weight percentage, the present embodiment aqueous inorganic paint is evenly mixed by following component:
Ethyl orthosilicate 12; Silane KH560:7; Zinc powder 19(2000 order); Aluminium powder 9(2000 order); Titanium valve 4(2000 order); Aluminium oxide 2(2000 order); Ethanol 18; All the other are water.
The sample having sprayed is solidified at 300 ℃ to 30-60min, take out, coating is prepared complete, and the thickness of coating is 7～9 μ m.
Then surface is had the neodymium iron boron sample of inorganic coating to apply one deck water-based organo-aluminium, titanium coating, by weight percentage, the present embodiment water-based organo-aluminium, titanium coating are evenly mixed by following component:
Waterborne polyurethane resin 25; Aluminium powder 10(2000 order); Titanium valve 10(2000 order); Dispersant (the German Bi Ke BYK-346 of chemical company) 0.5; Levelling agent (the German Bi Ke BYK-420 of chemical company) 0.5; Defoamer (the German Bi Ke BYK-020 of chemical company) 0.5; All the other are water.
Then, solidify 30-40min at 180 ℃, take out, coating is prepared complete, and the thickness of coating is 4～8 μ m, and total coating thickness is at 11～17 μ m.
The duplex coating adhesion of preparing by the method is good, and coating is fine and close, not corrosion of the 900h of resistance to neutral salt spray.
Embodiment result shows, the present invention is directed to some problems such as some process for protecting surface complex pretreatment such as current plating, chemical plating, solvent-based coating, harshness, seriously polluted and antiseptic property be poor, first to neodymium iron boron oil removing, rust cleaning, sand papering, then neodymium iron boron is applied to one deck aqueous inorganic paint, form inorganic coating; Afterwards, then apply one deck water-based organic coating, be formed with organic coating.Adopt aqueous inorganic/organic composite coating Double-protection, the pollution problem of neodymium iron boron protection and the restriction in application have been solved, and guaranteeing, under the impregnable prerequisite of adhesion, magnetic property of coating and matrix, to improve largely the resistance to neutral salt spray corrosive nature of coating.
Claims (8)
1. the inorganic organic composite coating Double-protection of a Nd-Fe-B magnetic material aqueous surface method, is characterized in that, first, and to neodymium iron boron oil removing, rust cleaning, sand papering; Then, neodymium iron boron is applied to one deck aqueous inorganic paint, form inorganic coating; Afterwards, then apply one deck water-based organic coating, be formed with organic coating;
By weight percentage, the composition of aqueous inorganic paint and content range are as follows:
Ethyl orthosilicate 5～15; Silane KH560:3～10; Zinc powder 15～30; Aluminium powder 4～10; Titanium valve 2～5; Aluminium oxide 1～4; Ethanol 5～20; All the other are water.
2. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 1 method, it is characterized in that, degreasing fluid is mixed by NaOH, sodium carbonate, tertiary sodium phosphate, sodium metasilicate, OP-10 emulsifying agent and water, and the content of each component is as follows:
NaOH 3～15 g/L; Sodium carbonate 20～80 g/L; Tertiary sodium phosphate 50～100 g/L; Sodium metasilicate 5～15 g/L; OP-10 emulsifying agent 0.2～3 g/L; All the other are water.
3. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 1 method, it is characterized in that, rust removing solution is mixed by hydrochloric acid, nitric acid, and the content of each component is as follows:
Hydrochloric acid 2～10g/L; Nitric acid 20～80 g/L; All the other are water.
4. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 1 method, it is characterized in that, sand papering is first roughly ground with 150#, then uses 600# sand papering.
5. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 1 method, it is characterized in that, by weight percentage, composition and the content range of water-based organic coating are as follows:
Water-based organic resin 10～60; Filler 3～25; Auxiliary agent 0.3～3; All the other are water.
6. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 5 method, it is characterized in that, the filler of water-based organic coating is one or more inorganic fillers in aluminium powder, titanium valve, zinc powder, silica, aluminium oxide, zinc oxide, ferrotitanium powder, iron oxide red, copper powder, and the granularity of filler is 1000～2000 orders.
7. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 5 method, it is characterized in that, water-based organic resin is one or more in aqueous epoxy resins, water-borne acrylic resin, water-based fluorocarbon resin, waterborne polyurethane resin.
8. according to the inorganic organic composite coating Double-protection of Nd-Fe-B magnetic material aqueous surface claimed in claim 1 method, it is characterized in that, the thickness of aqueous inorganic coating is 5～15 μ m, the thickness of water-based organic coating is 3～10 μ m, and aqueous inorganic coating and water-based organic coating gross thickness are at 10～17 μ m.
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| CN115537796A (en) * | 2022-09-02 | 2022-12-30 | 中国科学院宁波材料技术与工程研究所 | Surface protection method of sintered neodymium-iron-boron magnet and product thereof |
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