CN109825826B - Chromium-free insulating coating liquid, preparation method thereof and oriented silicon steel plate - Google Patents
Chromium-free insulating coating liquid, preparation method thereof and oriented silicon steel plate Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 82
- 239000011248 coating agent Substances 0.000 title claims abstract description 81
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000243 solution Substances 0.000 claims abstract description 18
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 15
- 239000010452 phosphate Substances 0.000 claims abstract description 15
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- ODNBVEIAQAZNNM-UHFFFAOYSA-N 1-(6-chloroimidazo[1,2-b]pyridazin-3-yl)ethanone Chemical compound C1=CC(Cl)=NN2C(C(=O)C)=CN=C21 ODNBVEIAQAZNNM-UHFFFAOYSA-N 0.000 claims abstract description 8
- GUNJVIDCYZYFGV-UHFFFAOYSA-K Antimony trifluoride Inorganic materials F[Sb](F)F GUNJVIDCYZYFGV-UHFFFAOYSA-K 0.000 claims abstract description 8
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims abstract description 8
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004327 boric acid Substances 0.000 claims abstract description 8
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 8
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 8
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011975 tartaric acid Substances 0.000 claims abstract description 8
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 8
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000008199 coating composition Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 4
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims description 4
- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 claims description 4
- 229910000401 monomagnesium phosphate Inorganic materials 0.000 claims description 4
- 235000019785 monomagnesium phosphate Nutrition 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 150000001845 chromium compounds Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004299 exfoliation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- SGRJLTOOQLQDRH-UHFFFAOYSA-N 2-[[2,4-dicarboxybutyl(hydroxy)phosphoryl]methyl]pentanedioic acid Chemical compound OC(=O)CCC(C(O)=O)CP(O)(=O)CC(C(O)=O)CCC(O)=O SGRJLTOOQLQDRH-UHFFFAOYSA-N 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 229940062672 calcium dihydrogen phosphate Drugs 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- NAAXGLXYRDSIRS-UHFFFAOYSA-L dihydrogen phosphate;manganese(2+) Chemical compound [Mn+2].OP(O)([O-])=O.OP(O)([O-])=O NAAXGLXYRDSIRS-UHFFFAOYSA-L 0.000 description 1
- LCFKXCNZLIBDOX-UHFFFAOYSA-L dihydrogen phosphate;nickel(2+) Chemical compound [Ni+2].OP(O)([O-])=O.OP(O)([O-])=O LCFKXCNZLIBDOX-UHFFFAOYSA-L 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 235000019691 monocalcium phosphate Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 description 1
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention provides a chromium-free insulating coating liquid, a preparation method thereof and an oriented silicon steel plate. The chromium-free insulating coating liquid comprises the following components: 200 parts of phosphate solution, 8-15 parts of citric acid, 2-8 parts of magnesium hydroxide, 7-10 parts of boric acid, 250 parts of silica sol, 1-10 parts of tartaric acid, 1-10 parts of antimony trifluoride, 1-10 parts of phosphotungstic acid and 300 parts of water. The preparation method of the chromium-free insulating coating liquid comprises the following steps: adding phosphate solution, boric acid and water, and stirring; sequentially adding antimony trifluoride, citric acid and tartaric acid, and stirring; adding magnesium hydroxide and phosphotungstic acid to make pH 1-5; adding silica sol, and stirring to obtain the chromium-free insulating coating liquid. The chromium-free insulating coating has extremely high interlayer resistance and surface hardness, excellent corrosion resistance and extremely high surface tension, and shows excellent magnetic property improvement effect.
Description
Technical Field
The invention belongs to the technical field of silicon steel, and particularly relates to a chromium-free insulating coating liquid, a preparation method thereof and an oriented silicon steel plate.
Background
Oriented silicon steel is an important magnetic material, has excellent properties of high magnetic induction and low iron loss, and is widely used as an iron core material of a power transformer. The insulating coating coated on the surface of the oriented silicon steel not only has the functions of rust prevention, corrosion resistance and insulation, but also can reduce the iron loss, the magnetostriction coefficient and the energy consumption and noise of the transformer by the tension generated on the surface of the oriented silicon steel. Therefore, the insulating coating is an important component of the oriented silicon steel.
However, most of the insulating coating liquids used at present contain chromate. After the insulating coating liquid containing chromate is coated on a steel plate and is dried at high temperature and sintered to form a film, hexavalent chromium always exists in the steel plate coating. If the waste steel plate is not reasonably recycled, the waste steel plate is not only harmful to human health, but also seriously pollutes the environment. If hexavalent chromium in the coating is recovered, the cost of the enterprise is greatly increased. Therefore, the development and development of the silicon steel insulating coating which has excellent comprehensive performance, does not contain toxic hexavalent chromium in the final product of the coating and is easy to recover is an urgent requirement of the domestic and foreign silicon steel industry. As a solution to replace chromic anhydride, patent JP 2000169973 proposes a method of adding a boron compound instead of a chromium compound, and patent JP 2000169972 proposes a method of adding an oxide colloid. However, with either of these techniques, it is not possible to achieve a coating having overall properties comparable to those of chromium-containing coatings.
Disclosure of Invention
The invention provides a chromium-free insulating coating solution which does not contain toxic hexavalent chromium, is easy to recover and has excellent performance, a preparation method thereof and an oriented silicon steel plate for solving the technical problems.
The purpose of the invention is realized by adopting the following scheme:
a chromium-free insulating coating liquid comprises the following components: 200 parts of phosphate solution, 8-15 parts of citric acid, 2-8 parts of magnesium hydroxide, 6-10 parts of boric acid, 150 parts of silica sol, 1-10 parts of tartaric acid, 1-10 parts of antimony trifluoride, 1-10 parts of phosphotungstic acid and 300 parts of water.
In the scheme, the solid content of the chromium-free insulating coating liquid is 20-40%, the specific gravity is 1.1-1.3 g/ml, and the viscosity is 10-30 s.
In the above scheme, the silica sol is acidic or alkaline silica sol, and the particle size of the silica particles is 1-10 nm.
In the scheme, the phosphate solution is a mixture of aluminum dihydrogen phosphate solution and magnesium dihydrogen phosphate solution.
The preparation method of the chromium-free insulating coating liquid comprises the following steps:
adding phosphate solution, boric acid and water, and stirring;
sequentially adding antimony trifluoride, citric acid and tartaric acid, and stirring;
adding magnesium hydroxide and phosphotungstic acid to make pH be 1-5,
adding silica sol, and stirring to obtain the chromium-free insulating coating liquid.
The oriented silicon steel plate comprises a substrate and a chromium-free insulating coating formed on the surface of the substrate, wherein the chromium-free insulating coating is obtained by coating the chromium-free insulating coating liquid on the surface of the substrate.
In the scheme, the preparation method of the chromium-free insulating coating specifically comprises the following steps:
coating the chromium-free insulating coating liquid on the oriented silicon steel plate, drying the coated coating composition at the temperature of 350-500 ℃ for 30-80 s, and then sintering and curing at the temperature of 800-1000 ℃ for 50-150 s, namely forming the chromium-free insulating coating on the surface of the oriented silicon steel plate.
In the scheme, the thickness of the chromium-free insulating coating is 1-5 microns.
In the scheme, the coating amount of the dry film is controlled to be 2.0-7.0g/m2Within the range.
Compared with the prior art, the invention has the following positive effects:
1. the chromium-free insulating coating does not contain chromium compounds (+ 6-valent Cr and + 3-valent Cr), toxic substances (Pb, Cr, Hg, Cd, PBB, PBDA) and the like specified by RoHS, and is easy to recover.
2. The chromium-free insulating coating can be stably stored for more than 3 months (the viscosity change value is less than 5s) at normal temperature, has good leveling property and wettability, is easy to coat on the surface of the oriented silicon steel plate, and can meet the sintering and curing temperature of the silicon steel plate of 800-1000 ℃ after coating operation and be directly cooled.
3. The chromium-free insulating coating of the invention has excellent adhesion, corrosion resistance and film exudation resistance when being coated on a steel plate, and has excellent performances of adhesion resistance, lubricity, stamping property, weldability and the like.
4. The chromium-free insulating coating has extremely high interlayer resistance and surface hardness, extremely high surface tension and excellent magnetic property improvement effect. The oriented silicon steel product can completely meet the use requirements of large transformers, extra-high voltage transformers and the like.
Detailed Description
In order to make the contents, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to specific examples, which are only used for illustrating the present invention, and the present invention is not limited to the following examples.
The invention provides a chromium-free insulating coating liquid, which comprises the following components: 200 parts of phosphate solution, 8-15 parts of citric acid, 2-8 parts of magnesium hydroxide, 7-10 parts of boric acid, 250 parts of silica sol, 1-10 parts of tartaric acid, 1-10 parts of antimony trifluoride, 1-10 parts of phosphotungstic acid and 300 parts of water.
The solid content of the coating composition is 20-40%, the specific gravity is 1.1-1.3 g/ml, and the viscosity is 10-30 s (4# Ford cup); the quality of the water is adjusted primarily according to the viscosity of the composition.
The solid content of the phosphate solution is 40-60%, and the phosphate is preferably dihydric phosphate. The dihydric phosphate is preferably a mixed solution of any one or more than two of aluminum dihydrogen phosphate, calcium dihydrogen phosphate, nickel dihydrogen phosphate, manganese dihydrogen phosphate, magnesium dihydrogen phosphate or zinc dihydrogen phosphate in any proportion. Further, the phosphate solution is preferably a mixture of an aluminum dihydrogen phosphate solution and a magnesium dihydrogen phosphate solution.
The particle diameter of the silica particles in the silica sol is 1-10 nm. The mass percentage of the silicon dioxide particles in the silica sol is 20-30%. The silica particles are acidic or basic silica particles, preferably acidic silica particles.
The invention also provides a preparation method of the chromium-free insulating coating liquid, which comprises the following steps:
adding phosphate solution, boric acid and water, and stirring;
sequentially adding antimony trifluoride, citric acid and tartaric acid, and stirring;
adding magnesium hydroxide and phosphotungstic acid to make pH 1-5;
adding silica sol, and stirring to obtain the chromium-free insulating coating liquid.
The invention also provides an oriented silicon steel plate, which comprises a substrate and a chromium-free insulating coating formed on the surface of the substrate, wherein the chromium-free insulating coating is obtained by coating chromium-free insulating coating liquid on the surface of the substrate, and the specific method comprises the following steps: coating the chromium-free insulating coating liquid on the oriented silicon steel plate, drying the coated coating composition at the temperature of 350-500 ℃ for 30-80 s, and then sintering and curing at the temperature of 800-1000 ℃ for 50-150 s, namely forming the chromium-free insulating coating on the surface of the oriented silicon steel plate, wherein the coating amount of a dry film is controlled to be 2.0-7.0g/m2Within the range. The thickness of the chromium-free insulating coating is 1-5 microns.
The invention is further illustrated by the following specific examples, and table 1 lists chromium-free insulating coating solutions of different formulations.
TABLE 1 non-chrome insulating coating liquid of different compositions of examples of the present invention and comparative examples
It is noted that the mass of water may be added depending on the viscosity and solids content requirements of the composition.
The coating prepared according to the embodiment and the comparative example of the invention is coated on the surface of the oriented silicon steel plate (the oriented silicon steel has the specification of 0.18mm, 0.2mm, 0.23mm, 0.27mm, 0.3mm and the like according to the thickness, 0.23mm oriented silicon steel sheet subjected to high-temperature secondary recrystallization annealing is selected in the test), before coating, the oriented silicon steel sheet is put into 3.0% dilute sulfuric acid solution to be soaked for 1min at normal temperature, then is cleaned and scrubbed by deionized water and a soft hair brush, the surface moisture is quickly dried, and the surface magnesium oxide and other floating ash are removed to obtain a clean oriented silicon steel plate for coating test.
Coating the insulating coating liquid on the surface of the oriented silicon steel plate by a coating roller of a coating machine, directly drying the obtained coated coating composition steel plate in a continuous drying furnace at 450 ℃, and controlling the coating amount to be 2.0-7.0g/m2Within the range; and sintering the steel plate at 900 ℃ for 1min in a continuous annealing furnace, taking out the steel plate and cooling the steel plate to form a uniform chromium-free insulating coating on the surface of the steel plate, and performing post-treatment.
After the coating test is completed, the test plate is subjected to tests of salt spray, interlayer resistance, magnetic property and the like.
TABLE 2 coating Performance test
The specific test methods for measuring performance referred to in table 2 are as follows:
1) the method for testing the tension of the skin film comprises the following steps:
a silicon steel sheet coated with a coating composition on both sides to form a chromium-free insulating coating was cut in a rolling direction into a test piece of 30mm X280 mm, the insulating coating on one side of the test piece was removed, the test piece was laid upright with one end fixed at 30mm, the bending size of the other end was measured, and the data was calculated by substituting the following equation:
σ (MPa) × 1.2152 × 105(MPa) × plate thickness (mm) × bend (mm)/250(mm)/250 (mm).
2) The test method for the resistance to the exudation of substances in the skin film comprises the following steps:
the test piece was sprayed with 100 ℃ steam for 30 minutes to observe the change in the appearance of the coating.
Evaluation method.
3) The test method of the coating adhesion is as follows:
evaluation method bending test piece into
20. And adhering a transparent adhesive tape on the bent part of the insulating layer in a circle of 30mm, and then uncovering the transparent adhesive tape to visually observe the peeling condition of the insulating layer.
Evaluation criteria of: none at all: partial exfoliation ×: massive exfoliation
4) The corrosion resistance test method comprises the following steps:
evaluation method: SST 12 hours before annealing; SST 5 hours after annealing.
The evaluation criteria applied was 10-point method.
10: 0% of red rust area, 9: 0-1% of red rust area, 8: 1-5% of red rust area, 7: 5-10% of red rust area, 6: 10-15% of red rust area, 5: 15-25% of red rust area, 4: 25-35% of red rust area, 3: 35-45% of red rust area, 2: 45-65% of red rust area, 1: 65% of red rust area, or more.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and various modifications thereof will be apparent to those skilled in the art, therefore, the present invention should not be limited to the embodiments shown herein, and all equivalent changes and modifications made within the scope of the present invention should be covered by the claims.
Claims (8)
1. The chromium-free insulating coating liquid is characterized by comprising the following components: 200 parts of phosphate solution, 8-15 parts of citric acid, 2-8 parts of magnesium hydroxide, 7-10 parts of boric acid, 250 parts of silica sol, 1-10 parts of tartaric acid, 1-10 parts of antimony trifluoride, 1-10 parts of phosphotungstic acid and 300 parts of water, wherein the phosphate solution is a mixture of aluminum dihydrogen phosphate solution and magnesium dihydrogen phosphate solution.
2. The chromium-free insulating coating solution according to claim 1, wherein the chromium-free insulating coating solution has a solid content of 20% to 40%, a specific gravity of 1.1g/mL to 1.3g/mL, and a viscosity of 10s to 30 s.
3. The chromium-free insulating coating solution according to claim 1, wherein the silica sol is an acidic or basic silica sol, and the silica particles have a particle diameter of 1 to 10 nm.
4. The method for preparing a chromium-free insulating coating liquid according to any one of claims 1 to 3, comprising the steps of:
adding phosphate solution, boric acid and water, and stirring;
sequentially adding antimony trifluoride, citric acid and tartaric acid, and stirring;
adding magnesium hydroxide and phosphotungstic acid to make pH 1-5;
adding silica sol, and stirring to obtain the chromium-free insulating coating liquid.
5. An oriented silicon steel sheet, comprising a substrate and a chromium-free insulating coating formed on a surface of the substrate, wherein the chromium-free insulating coating is obtained by applying the chromium-free insulating coating liquid according to any one of claims 1 to 3 to the surface of the substrate.
6. The oriented silicon steel plate according to claim 5, wherein the preparation method of the chromium-free insulating coating is specifically as follows:
coating the chromium-free insulating coating liquid on the oriented silicon steel plate, drying the coated coating composition at the temperature of 350-500 ℃ for 30-80 s, and then sintering and curing at the temperature of 800-1000 ℃ for 50-150 s, namely forming the chromium-free insulating coating on the surface of the oriented silicon steel plate.
7. The grain-oriented silicon steel sheet according to claim 6, wherein the chromium-free insulating coating has a thickness of 1 to 5 μm.
8. The grain-oriented silicon steel sheet according to claim 6, wherein the coating amount of the dry film is controlled to 2.0 to 7.0g/m2Within the range.
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| JP3408748B2 (en) * | 1998-08-05 | 2003-05-19 | 川崎製鉄株式会社 | Electrical steel sheet with insulating coating excellent in anti-nitridation property, adhesion and corrosion resistance and method for producing the same |
| CN107675156B (en) * | 2017-08-14 | 2019-07-26 | 合肥市田源精铸有限公司 | A kind of processing method enhancing bell housing mechanical performance |
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|---|---|---|---|---|
| CN103508570A (en) * | 2012-06-25 | 2014-01-15 | 上海思曼泰化工科技有限公司 | Environmental protection and high efficiency corrosion inhibitor for inhibiting salt water corrosion on carbon steel, preparation method and use method thereof |
| CN107190252A (en) * | 2017-06-13 | 2017-09-22 | 武汉圆融科技有限责任公司 | A kind of chrome-free insulating coating composition and preparation method thereof and directional silicon steel |
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