WO2020049854A1 - 絶縁被膜付き電磁鋼板およびその製造方法 - Google Patents
絶縁被膜付き電磁鋼板およびその製造方法 Download PDFInfo
- Publication number
- WO2020049854A1 WO2020049854A1 PCT/JP2019/026919 JP2019026919W WO2020049854A1 WO 2020049854 A1 WO2020049854 A1 WO 2020049854A1 JP 2019026919 W JP2019026919 W JP 2019026919W WO 2020049854 A1 WO2020049854 A1 WO 2020049854A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- chromium
- insulating coating
- electromagnetic steel
- coating
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000000576 coating method Methods 0.000 title claims abstract description 81
- 239000011248 coating agent Substances 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000009413 insulation Methods 0.000 title abstract description 7
- 239000011651 chromium Substances 0.000 claims abstract description 77
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229920005989 resin Polymers 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 38
- 150000001845 chromium compounds Chemical class 0.000 claims description 12
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000010828 elution Methods 0.000 abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 43
- 238000000034 method Methods 0.000 description 28
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 11
- 230000006698 induction Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 7
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- -1 aluminum compound Chemical class 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 150000002009 diols Chemical class 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229960004793 sucrose Drugs 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- KSPIHGBHKVISFI-UHFFFAOYSA-N Diphenylcarbazide Chemical compound C=1C=CC=CC=1NNC(=O)NNC1=CC=CC=C1 KSPIHGBHKVISFI-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- ZUQAPLKKNAQJAU-UHFFFAOYSA-N acetylenediol Chemical class OC#CO ZUQAPLKKNAQJAU-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000013681 dietary sucrose Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229960002737 fructose Drugs 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 229960001031 glucose Drugs 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000008101 lactose Substances 0.000 description 1
- 229960001375 lactose Drugs 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003335 steric effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 235000000346 sugar Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
- C23C22/30—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also trivalent chromium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2301/00—Inorganic additives or organic salts thereof
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
Definitions
- the present invention relates to an electromagnetic steel sheet with an insulating coating and a method for manufacturing the same.
- Insulating coatings on magnetic steel sheets used for motors, transformers, etc. require not only interlayer resistance but also various characteristics. For example, convenience during processing, corrosion resistance during storage, appearance stability, stable insulation (interlayer resistance) during use, and the like. Further, since electromagnetic steel sheets are used for various purposes, various insulating coatings have been developed according to the uses. It can be roughly classified into three types: (1) semi-organic coating, (2) inorganic coating, and (3) organic coating.
- Electromagnetic steel sheets are usually punched, laminated and fixed, and processed into iron cores for motors and transformers. At this time, in order to remove the processing strain generated in the magnetic steel sheet and improve the magnetic properties, the steel sheet is often subjected to strain relief annealing at a temperature of 700 ° C. or more. Since the electrical steel sheet used for performing the strain relief annealing is required to have heat resistance enough to withstand the heat during the strain relief annealing, the above-mentioned (1) semi-organic coating and (2) An inorganic coating is used. The major difference between the films (1) and (2) is the presence or absence of the resin, and the presence or absence of the resin causes a difference in the balance of the film characteristics. For this reason, (1) and (2) are selectively used according to the characteristic to be emphasized.
- various main agents such as chromic acid-based, phosphoric acid-based, and inorganic colloid-based are used.
- chromic acid-based materials are excellent in various properties. Therefore, it is widely used.
- a chromic acid-based main agent when used, hexavalent chromium is highly harmful, so it is required to reduce it to trivalent chromium during film formation so that hexavalent chromium is not contained in the product. . For this reason, baking conditions and baking temperatures are important management items at the time of manufacturing.
- Patent Documents 1 and 2 In order to meet such demands, there have been proposed electromagnetic steel sheets with an insulating coating that contain an aluminum compound in chromic acid and suppress an alkaline earth metal to a certain amount or less (for example, Patent Documents 1 and 2). . These magnetic steel sheets with an insulating coating can be used at a lower baking temperature even when a chromic acid-based base material is used, and can be used for high-speed coating, which is effective for improving productivity and saving energy. To contribute.
- low-temperature baking and high-speed coating are not originally advantageous technologies for improving chromium elution resistance.
- hexavalent chromium to trivalent chromium may be used. There is a case where hexavalent chromium remains in the product when the reduction reaction does not proceed sufficiently, and there is a problem in chromium elution resistance when manufactured by rapid heating.
- the present invention solves the above-mentioned problems, and provides an electrical steel sheet with an insulating coating excellent in chromium elution resistance even when baking of the insulating coating is performed by rapid heating which is advantageous for improving productivity, and a method for producing the same.
- the purpose is to do.
- the present inventors have conducted intensive studies on baking of an insulating film by rapid heating to achieve the above object. As a result, if the insulating coating contains Fe, Cr, an organic resin and an organic reducing agent, and the ratio of the Fe content to the Cr content (Fe / Cr) is within a predetermined range, the chromium resistance to elution is high. It has been newly found that a magnetic steel sheet with an insulating coating having excellent resistance can be obtained.
- the present invention is based on the above findings. That is, the gist configuration of the present invention is as follows.
- An electromagnetic steel sheet with an insulating coating comprising an insulating coating containing Fe, Cr, an organic resin, and an organic reducing agent on at least one surface of the surface of the electromagnetic steel sheet,
- An electromagnetic steel sheet with an insulating coating wherein a ratio (Fe / Cr) of the content of Fe to the content of Cr in the insulating coating is 0.010 to 0.6 in molar ratio.
- a treatment liquid containing a chromium compound having a trivalent chromium / total chromium mass ratio of 0.5 or less, an organic resin, and an organic reducing agent is applied to at least one surface of the magnetic steel sheet.
- a method for producing an electromagnetic steel sheet with an insulating coating wherein the steel sheet is heated from the steel sheet side and the treatment liquid is baked so that the temperature rise rate in a temperature range of 350 ° C. is 20 ° C./sec or more.
- a treatment liquid comprising a chromium compound having a mass ratio of trivalent chromium / total chromium of 0.5 or less, an organic resin, and an organic reducing agent is applied to at least one surface of the magnetic steel sheet.
- a method for producing an electromagnetic steel sheet with an insulating coating wherein the steel sheet is heated from the steel sheet side and the treatment liquid is baked so that the rate of temperature rise in a temperature range of 20 ° C. is 20 ° C./sec or more.
- the present invention even when the baking of the insulating film is performed by rapid heating which is advantageous for improving the productivity, it is possible to obtain an electrical steel sheet with an insulating film having excellent chromium elution resistance.
- the magnetic steel sheet As the material of the present invention, but it is preferable to appropriately adjust the components according to the required characteristics. For example, since it is effective to increase the specific resistance to improve the iron loss, it is preferable to add a specific resistance improving component such as Si, Al, Mn, Cr, P, and Ni. These component ratios may be determined according to the required magnetic properties.
- a specific resistance improving component such as Si, Al, Mn, Cr, P, and Ni.
- C and S are disadvantageous elements for weldability, and it is desirable to lower them from the viewpoint of magnetic properties. It is preferable that C is 0.01 mass% or less and S is 0.01 mass% or less.
- the method of manufacturing the magnetic steel sheet there is no limitation on the method of manufacturing the magnetic steel sheet, and various conventionally known methods can be applied.
- the surface roughness of the magnetic steel sheet is not particularly limited, but when emphasis is placed on the space factor, the three-dimensional surface roughness SRa is preferably 0.5 ⁇ m or less.
- the final thickness of the electromagnetic steel sheet is not particularly limited, and various thicknesses can be applied. From the viewpoint of magnetic properties, it is preferable that the final thickness of the electromagnetic steel sheet is 0.8 mm or less.
- the electromagnetic steel sheet with the insulating coating of the present invention includes an insulating coating containing Fe, Cr, an organic resin and an organic reducing agent on at least one surface of the surface of the electromagnetic steel sheet, and the content of Fe and the content of Cr in the insulating coating.
- the ratio (Fe / Cr) is 0.010 to 0.6 in molar ratio.
- the insulating coating contains Fe.
- the insulating film containing Fe is formed by diffusing Fe from the electromagnetic steel sheet into the insulating film when the insulating film is formed.
- the amount of Fe diffusion can be appropriately adjusted by the rate of temperature rise during baking.
- the insulating coating contains Cr.
- the insulating film containing Cr is formed by baking a treatment solution containing a chromium compound at the time of forming the insulating film.
- the chromium compound contained in the treatment liquid is a chromium compound having a mass ratio of trivalent chromium / total chromium of 0.5 or less. Hexavalent chromium present in the treatment liquid is reduced to trivalent chromium by a reduction reaction with an organic reducing agent at the time of baking, whereby chromium elution resistance of the insulating coating can be improved.
- the present invention is characterized in that the ratio of the content of Fe to the content of Cr in the insulating film (Fe / Cr) is 0.010 to 0.6 in molar ratio.
- the ratio (Fe / Cr) is 0.010 to 0.6 in terms of molar ratio, the coating properties of the electromagnetic steel sheet with the insulating coating, particularly the elution resistance of chromium and the corrosion resistance are improved.
- the preferable range of the Fe / Cr ratio is 0.030 to 0.6.
- the ratio (Fe / Cr) is determined by heating the steel sheet side and baking the processing liquid so that the rate of temperature rise in a predetermined temperature range is within a predetermined range when the processing liquid is baked, as described later. It is controllable, and in particular, it becomes possible to promote the diffusion of Fe by using induction heating.
- the ratio (Fe / Cr) can be determined by dissolving the coating with hot alkali.
- the coating can be measured by dissolving the coating in a 20% by mass aqueous NaOH solution in which a coated steel sheet is heated, and subjecting Fe and Cr in the dissolved liquid to ICP analysis.
- the insulating coating contains an organic resin.
- the type of organic resin is not particularly limited, and acrylic resin, epoxy resin, urethane resin, phenol resin, styrene resin, amide resin, imide resin, urea resin, vinyl acetate resin, alkyd resin, polyolefin resin, and polyester resin And the like, and these can be applied alone, as a copolymer, or as a mixture. Further, any form may be used as long as it is an aqueous resin, and various forms such as an emulsion resin, a dispersion resin, a suspension resin, and a powder resin are conceivable. Since cracks in the coating after baking can be suppressed, a water-soluble resin having no particle diameter can be used in combination.
- the organic resin in a mass ratio of 0.05 to 0.4 with respect to all chromium. If the amount of the organic resin is less than 0.05, sufficient punching properties cannot be obtained. On the other hand, if it exceeds 0.4, the heat resistance will deteriorate.
- the solid content of the organic resin preferably has a particle diameter of 30 nm or more.
- the upper limit is not particularly limited, but is preferably 1 ⁇ m (1000 nm) or less when emphasis is placed on increasing the space factor of the electromagnetic steel sheet in the motor or transformer as the final product.
- the insulating coating contains an organic reducing agent in order to promote the reduction reaction of chromium.
- the type of the organic reducing agent is not particularly limited, but it is preferable to use one selected from diols and / or at least one selected from sugars.
- diols ethylene glycol, propylene glycol, trimethylene glycol, and 1,4-butanediol are preferably used, and among saccharides, glycerin, polyethylene glycol, saccharose, lactose, sucrose, glucose, and fructose are more preferably used. .
- the amount of the organic reducing agent is preferably 0.1 to 2 in mass ratio to the total chromium. If the amount of the reducing agent is less than 0.1, the chromic acid / reducing agent reaction does not proceed sufficiently, while if it exceeds 2, the reaction reaches saturation, and the reducing agent remains in the coating to cause deterioration in weldability. is there.
- the insulating coating of the present invention preferably contains an additive, if necessary, in order to further improve the performance and uniformity of the coating.
- an additive known additives applied to conventionally known chromic acid-based insulating coatings can be used.
- surfactants nonionic, cationic, anionic surfactant, silicone-based surfactants
- silicone-based surfactants can be used.
- Surfactants acetylene diols, etc., rust inhibitors (amine, non-amine rust inhibitors, etc.), boric acid, silane coupling agents (amino silane, epoxy silane, etc.), lubricants (wax, etc.), alumina sol, silica sol And organic and inorganic additives such as oxide sols such as iron sol, titania sol, tin sol, cerium sol, antimony sol, tungsten sol and molybdenum sol.
- the content is preferably 10% by mass or less based on the total solid content of the insulating film of the present invention in order to maintain sufficient film properties.
- a treatment solution containing a chromium compound having a trivalent chromium / total chromium mass ratio of 0.5 or less, an organic resin, and an organic reducing agent is applied to at least one surface of the magnetic steel sheet.
- the treatment liquid is baked by heating from the steel sheet side so that the rate of temperature rise in the temperature range of up to 350 ° C. is 20 ° C./sec or more.
- the treatment liquid for the insulating coating comprises a chromium compound having a mass ratio of trivalent chromium / total chromium of 0.5 or less, an organic resin, and an organic reducing agent.
- the mass ratio of trivalent chromium / total chromium needs to be 0.5 or less.
- Hexavalent chromium present in the composition is reduced to trivalent chromium by a reduction reaction with a reducing agent at the time of baking, and is adsorbed on the steel sheet.
- the mass ratio of trivalent chromium / total chromium in the processing liquid is more than 0.5, the electric and steric effects of the trivalent chromium polymerized in the processing liquid may cause the hexavalent chromium to burn during baking. The reactivity is impaired, and as a result, the Cr elution resistance as a film is inferior.
- the mass ratio of trivalent chromium / total chromium in the treatment liquid is more than 0.5, a gel-like precipitate is formed by the trivalent chromium polymerized in the treatment liquid, and the properties of the treatment liquid are reduced. It is hard to keep.
- the treatment liquid of the present invention is an aqueous solution containing at least one of chromic anhydride, chromate and dichromate as a chromium compound as a main component.
- chromate or bichromate include a chromate or bichromate containing at least one selected from metals such as Ca, Mg, Zn, K, Na, and Al.
- the treatment liquid of the present invention is a treatment liquid comprising a chromium compound having a mass ratio of trivalent chromium / total chromium of 0.5 or less, an organic resin, and an organic reducing agent, and includes Fe (Fe ion, Fe compound, etc.). Not included.
- a treatment liquid comprising a chromium compound having a mass ratio of trivalent chromium / total chromium of 0.5 or less, an organic resin, and an organic reducing agent, and includes Fe (Fe ion, Fe compound, etc.). Not included.
- Fe Fe ion, Fe compound, etc.
- the source of Fe is limited to elution from the surface of the steel sheet because the newly formed surface formed by the dissolution is a polar group (Cr—O) of trivalent chromium polymerized in the treatment liquid during the baking process. -, Cr-OH-) and Fe are firmly adhered to each other, which has the effect of improving corrosion resistance and adhesion.
- any method may be used as long as the treatment liquid can be applied on a steel sheet, and various methods such as a roll coater method, a bar coater method, an air knife method, and a spray coater method may be applied.
- a roll coater method a bar coater method, an air knife method, and a spray coater method may be applied.
- a spray coater method may be applied.
- baking for forming an insulating film is performed by heating from the steel plate side so that the rate of temperature rise in a temperature range of 100 to 350 ° C. is 20 ° C./sec or more.
- the reason for the rapid heating rate of 20 ° C./sec or more in the above-mentioned temperature range is that the elution of Fe from the steel sheet is promoted and the ratio of Fe content to Cr content in the insulating coating (Fe / Cr) is set to a predetermined value. This is to make it a range.
- rapid heating is performed in a temperature range of less than 100 ° C., local bumping or the like of water as a solvent of the processing liquid may occur, and the coating may become non-uniform.
- the maximum temperature of the plate when the treatment liquid is baked may be a temperature required for forming a coating film.
- the maximum plate temperature is set to 100 to 350 ° C. If the temperature is lower than 100 ° C., water as a solvent tends to remain. On the other hand, if the temperature exceeds 350 ° C., the organic resin may start to thermally decompose. Particularly preferably, it is in the range of 150 to 350 ° C.
- the heating rate in the temperature range of 100 to 350 ° C. is set to 20 ° C./sec or more.
- the rate of temperature rise is preferably above 35 ° C./sec.
- the upper limit of the heating rate is not particularly limited. However, if the heating rate is excessive, the heating device is increased in size and equipment costs are increased. Preferably, it is 150 ° C./sec or less.
- the method of baking treatment liquid to form an insulating film it is important to heat from the steel plate side.
- the method of heating from the coating surface which has been widely used in the past, such as gas furnaces and electric furnaces, if the heating rate is too high, the outermost layer is dried first, and low-boiling substances (solvents and reaction products) ) Remains and causes poor appearance such as swelling.
- the organic reducing agent does not sufficiently react and may be dissolved in the test solution during the dissolution test to reduce the similarly dissolved hexavalent chromium, so that the chromium dissolution resistance may not be accurately evaluated.
- the baking proceeds from the lower layer of the coating, so that hexavalent chromium is effectively reduced, and even if the baking rate is as high as about 150 ° C./s, the appearance defect does not occur at all.
- the method of heating from the steel plate side does not need to be performed in all the baking processes, and may be partial. When partially adopting the method of heating from the steel plate side, it is preferable that the baking process be performed for 0.5 second or longer.
- heating from the side of the steel sheet means not heating the steel sheet from the outside but heating the steel sheet from the inside by generating heat from the steel sheet itself.
- induction heating that causes an eddy current to flow through a steel sheet by the action of lines of magnetic force and causes the steel sheet itself to generate heat by the generated Joule heat, or causes current to flow directly to the steel sheet itself, thereby causing the steel sheet itself to generate heat by the generated Joule heat
- Direct current heating and the like are exemplified.
- direct current heating in which a current is directly applied to a running steel sheet. Therefore, induction heating in which an eddy current is generated in a running steel sheet by lines of magnetic force due to an external current is preferable.
- an induction heating method for heating using an eddy current generated in the steel sheet by magnetic lines of force due to an external current is particularly preferable.
- the frequency of induction heating, the rate of temperature rise, and the like are not particularly limited, and may be appropriately determined according to the heating time and efficiency, properties (sheet thickness, magnetic permeability, and the like) of the electromagnetic steel sheet, which are restricted from the facilities. Good.
- the basis weight of the insulating coating is preferably 0.05 to 7.0 g / m 2 . If the basis weight of the insulating coating is less than 0.05 g / m 2 , uniform coating is difficult and the coating performance becomes unstable. On the other hand, if the basis weight of the insulating coating exceeds 7.0 g / m 2, the adhesion of the coating decreases.
- the balance is a component composition comprising Fe and unavoidable impurities.
- a treatment liquid as an aqueous solution shown in Table 1 was applied using a roll coater.
- Each of the treatment liquids is a treatment liquid comprising a chromium compound, an organic resin, and an organic reducing agent, and does not contain Fe (Fe ion, Fe compound, and the like).
- a baking treatment was performed at a temperature rising rate and a maximum attained plate temperature shown in Table 1.
- the heating method for performing the baking treatment was an induction heating method (A), a hot blast stove heating method (C), or a method using both of them (B).
- the frequency was 30 kHz
- the heating rate was variously changed by changing the input current.
- Chromium elution resistance was evaluated by EPA3060A. 20 g of sodium hydroxide and 30 g of sodium carbonate (special grade reagent manufactured by Wako Pure Chemical Industries, Ltd.) were dissolved in pure water, and the volume was adjusted to 1 liter to obtain an eluate.
- ⁇ 24 Hr or more ⁇ : 12 Hr or more and less than 24 Hr ⁇ : 7 Hr or more and less than 12 Hr ⁇ : less than 7 Hr ⁇ Appearance evaluation by SEM> Using an SEM (scanning electron microscope), the surface of the insulating film was observed at arbitrary 10 fields of view at 1000 times, and cracks in the insulating film were observed. Judgment was made based on the following criteria, and ⁇ or ⁇ was rejected. ⁇ : The number of observed cracks was 0 in a total of 10 visual fields.
- ⁇ The observed number of cracks was 1 or more and less than 10 in a total of 10 visual fields.
- ⁇ The observed number of cracks was 10 or more and less than 30 in a total of 10 visual fields.
- ⁇ The number of observed cracks is 30 or more in a total of 10 visual fields ⁇ occupation ratio>
- the space factor was measured according to JIS C 2550. Judgment was made based on the following criteria, and x was rejected. ⁇ : 99% or more ⁇ : 98% or more and less than 99% ⁇ : 97% or more and less than 98% ⁇ : less than 97%
- Table 1 The observed number of cracks was 1 or more and less than 10 in a total of 10 visual fields.
- ⁇ The observed number of cracks was 10 or more and less than 30 in a total of 10 visual fields.
- ⁇ occupation ratio> The space factor was measured according to JIS C 2550. Judgment was made based on the following criteria, and x was rejected.
- ⁇ 99% or more ⁇
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Abstract
Description
[1]電磁鋼板表面の少なくとも片面に、Fe、Cr、有機樹脂および有機還元剤を含有する絶縁被膜を備えた絶縁被膜付き電磁鋼板であって、
前記絶縁被膜における、前記Feの含有量と前記Crの含有量の比(Fe/Cr)が、モル比で0.010~0.6である絶縁被膜付き電磁鋼板。
[2]前記有機樹脂の粒子径が30~1000nmである[1]に記載の絶縁被膜付き電磁鋼板。
[3]電磁鋼板の少なくとも片面に、3価クロム/全クロムの質量比が0.5以下であるクロム化合物と、有機樹脂と、有機還元剤とを含有する処理液を塗布した後、100~350℃の温度域における昇温速度が20℃/秒以上となるように、鋼板側から加熱して前記処理液を焼き付ける絶縁被膜付き電磁鋼板の製造方法。
[4]電磁鋼板の少なくとも片面に、3価クロム/全クロムの質量比が0.5以下であるクロム化合物と、有機樹脂と、有機還元剤とからなる処理液を塗布した後、100~350℃の温度域における昇温速度が20℃/秒以上となるように、鋼板側から加熱して前記処理液を焼き付ける絶縁被膜付き電磁鋼板の製造方法。
[5]前記昇温速度が35℃/秒超えである[3]または[4]に記載の絶縁被膜付き電磁鋼板の製造方法。
EPA3060Aにより、耐クロム溶出性の評価を行った。水酸化ナトリウム20g、炭酸ナトリウム30g(和光純薬工業株式会社製特級試薬)を純水で溶解し、1リットルに定容し、溶出液とした。この溶出液50mlをビーカーの中に入れ、液温が90~95℃になった後に、絶縁被膜付き電磁鋼板のサンプルとMgCl2(無水)0.4gと緩衝液(K2HPO4 87gとKH2PO4 68gとを1リットルの純水に溶解して作製)0.5mlを添加し、5分間撹拌した後、90~95℃で60分間溶出した。その後、溶出液をろ過し、得られたろ液に5モル/リットルのHNO3を加えてpH=7.5±0.5に調整し250mlに定容した。このうち95mlを分取し、10%H2SO4溶液でpH=2.0±0.5に調整し、0.5%ジフェニルカルバジド溶液2mlを添加した後、100mlに定容した。この溶液を5~10分間静止後Cr6+を測定し、6価クロムの溶出量に換算した。以下の基準で判定し、△または×を不合格とした。
◎:0.2mg/m2未満
〇:0.2mg/m2以上0.5mg/m2未満
△:0.5mg/m2以上1.0mg/m2未満
×:1.0mg/m2以上
<沸騰水蒸気曝露試験>
沸騰水蒸気に30分暴露後の外観を評価し、△または×を不合格とした。
◎:変化なし
〇:ほとんど変化なし
△:若干変化(白変、発錆等)
×:変化大(白変、発錆等)
<耐食性>
JIS-Z2371に準拠する塩水噴霧試験で評価した。条件は5%NaCl、温度35℃である。錆の発生状況を目視判定し、5%錆発生時間で判定した。△または×を不合格とした。
◎:24Hr以上
〇:12Hr以上24Hr未満
△:7Hr以上12Hr未満
×:7Hr未満
<SEMによる外観評価>
SEM(走査型電子顕微鏡)を用いて、絶縁被膜の表面を1000倍にて任意の10視野観察を行い、絶縁被膜中のクラックを観察した。以下の基準で判定を行い、△または×を不合格とした。
◎:クラックの観察個数が、10視野合計で0個
○:クラックの観察個数が、10視野合計で1個以上10個未満
△:クラックの観察個数が、10視野合計で10個以上30個未満
×:クラックの観察個数が、10視野合計で30個以上
<占積率>
JIS C 2550に沿って占積率を測定した。以下の基準で判定を行い、×を不合格とした。
◎:99%以上
〇:98%以上99%未満
△:97%以上98%未満
×:97%未満
結果を表1に示す。
Claims (5)
- 電磁鋼板表面の少なくとも片面に、Fe、Cr、有機樹脂および有機還元剤を含有する絶縁被膜を備えた絶縁被膜付き電磁鋼板であって、
前記絶縁被膜における、前記Feの含有量と前記Crの含有量の比(Fe/Cr)が、モル比で0.010~0.6である絶縁被膜付き電磁鋼板。 - 前記有機樹脂の粒子径が30~1000nmである請求項1に記載の絶縁被膜付き電磁鋼板。
- 電磁鋼板の少なくとも片面に、3価クロム/全クロムの質量比が0.5以下であるクロム化合物と、有機樹脂と、有機還元剤とを含有する処理液を塗布した後、100~350℃の温度域における昇温速度が20℃/秒以上となるように、鋼板側から加熱して前記処理液を焼き付ける絶縁被膜付き電磁鋼板の製造方法。
- 電磁鋼板の少なくとも片面に、3価クロム/全クロムの質量比が0.5以下であるクロム化合物と、有機樹脂と、有機還元剤とからなる処理液を塗布した後、100~350℃の温度域における昇温速度が20℃/秒以上となるように、鋼板側から加熱して前記処理液を焼き付ける絶縁被膜付き電磁鋼板の製造方法。
- 前記昇温速度が35℃/秒超えである請求項3または4に記載の絶縁被膜付き電磁鋼板の製造方法。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201980057161.5A CN112639165A (zh) | 2018-09-03 | 2019-07-08 | 带有绝缘被膜的电磁钢板及其制造方法 |
EP19857166.3A EP3808871A4 (en) | 2018-09-03 | 2019-07-08 | ELECTROMAGNETIC STEEL SHEET ON WHICH IS FIXED AN INSULATING COATING FILM, AND PROCESS FOR PRODUCING IT |
RU2021105318A RU2770738C1 (ru) | 2018-09-03 | 2019-07-08 | Лист из электротехнической стали, имеющий изолирующую пленку, и способ его изготовления |
CA3104849A CA3104849C (en) | 2018-09-03 | 2019-07-08 | Electrical steel sheet with insulating film and method for manufacturing the same |
KR1020217006366A KR20210035295A (ko) | 2018-09-03 | 2019-07-08 | 절연 피막 부착 전자 강판 및 그의 제조 방법 |
MX2021002469A MX2021002469A (es) | 2018-09-03 | 2019-07-08 | Lamina de acero electrico con pelicula aislante y metodo para la fabricacion de la misma. |
KR1020247006769A KR20240031442A (ko) | 2018-09-03 | 2019-07-08 | 절연 피막 부착 전자 강판 |
JP2019555704A JP6835252B2 (ja) | 2018-09-03 | 2019-07-08 | 絶縁被膜付き電磁鋼板およびその製造方法 |
US17/273,179 US20210324491A1 (en) | 2018-09-03 | 2019-07-08 | Electrical steel sheet with insulating film and method for manufacturing the same |
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- 2019-07-08 US US17/273,179 patent/US20210324491A1/en active Pending
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- 2019-07-08 KR KR1020217006366A patent/KR20210035295A/ko active Application Filing
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EP3808871A4 (en) | 2021-08-25 |
US20210324491A1 (en) | 2021-10-21 |
CA3104849A1 (en) | 2020-03-12 |
TWI732246B (zh) | 2021-07-01 |
CN112639165A (zh) | 2021-04-09 |
RU2770738C1 (ru) | 2022-04-21 |
KR20210035295A (ko) | 2021-03-31 |
JP6835252B2 (ja) | 2021-02-24 |
MX2021002469A (es) | 2021-04-29 |
TW202010868A (zh) | 2020-03-16 |
JPWO2020049854A1 (ja) | 2020-09-10 |
EP3808871A1 (en) | 2021-04-21 |
KR20240031442A (ko) | 2024-03-07 |
CA3104849C (en) | 2023-04-25 |
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