WO2015075792A1 - 耐黒変性と耐食性に優れた亜鉛めっき鋼板及びその製造方法 - Google Patents
耐黒変性と耐食性に優れた亜鉛めっき鋼板及びその製造方法 Download PDFInfo
- Publication number
- WO2015075792A1 WO2015075792A1 PCT/JP2013/081314 JP2013081314W WO2015075792A1 WO 2015075792 A1 WO2015075792 A1 WO 2015075792A1 JP 2013081314 W JP2013081314 W JP 2013081314W WO 2015075792 A1 WO2015075792 A1 WO 2015075792A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- corrosion resistance
- layer
- galvanized steel
- film
- Prior art date
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 83
- 238000005260 corrosion Methods 0.000 title claims abstract description 83
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 155
- 238000000576 coating method Methods 0.000 claims abstract description 150
- 239000011248 coating agent Substances 0.000 claims abstract description 149
- 238000007747 plating Methods 0.000 claims abstract description 127
- 229910052751 metal Inorganic materials 0.000 claims abstract description 63
- 239000002184 metal Substances 0.000 claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 239000002904 solvent Substances 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims abstract description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 79
- 239000008397 galvanized steel Substances 0.000 claims description 79
- 229920005989 resin Polymers 0.000 claims description 79
- 239000011347 resin Substances 0.000 claims description 79
- 238000000034 method Methods 0.000 claims description 49
- 229920001225 polyester resin Polymers 0.000 claims description 33
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- 239000011810 insulating material Substances 0.000 claims description 29
- 239000003973 paint Substances 0.000 claims description 27
- 229920000877 Melamine resin Polymers 0.000 claims description 25
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- 239000000839 emulsion Substances 0.000 claims description 14
- -1 melamine compound Chemical class 0.000 claims description 10
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 claims description 9
- 239000011344 liquid material Substances 0.000 claims description 9
- 230000009477 glass transition Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 238000001771 vacuum deposition Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 229910018464 Al—Mg—Si Inorganic materials 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 221
- 239000010408 film Substances 0.000 description 168
- 239000007788 liquid Substances 0.000 description 40
- 239000000243 solution Substances 0.000 description 22
- 238000012360 testing method Methods 0.000 description 20
- 238000011156 evaluation Methods 0.000 description 19
- 230000007547 defect Effects 0.000 description 17
- 238000011282 treatment Methods 0.000 description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 238000009835 boiling Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 238000001035 drying Methods 0.000 description 12
- 239000004640 Melamine resin Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 10
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 10
- 239000007787 solid Substances 0.000 description 10
- 238000013461 design Methods 0.000 description 9
- 239000000049 pigment Substances 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000004566 building material Substances 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 6
- 229910018134 Al-Mg Inorganic materials 0.000 description 5
- 229910018467 Al—Mg Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000518 rheometry Methods 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 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 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 3
- 229920003270 Cymel® Polymers 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
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- 239000002562 thickening agent Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 229910001429 cobalt ion Inorganic materials 0.000 description 1
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
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- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/018—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of a noble metal or a noble metal alloy
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C09D161/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
- C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/712—Weather resistant
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/752—Corrosion inhibitor
Definitions
- the present invention relates to a galvanized steel sheet excellent in blackening resistance and corrosion resistance, and relates to a galvanized steel sheet applicable to home appliances, building materials, civil engineering, machinery, automobiles, furniture, containers and the like. It also relates to the manufacturing method.
- Galvanized steel sheets are widely used as plated steel sheets with excellent corrosion resistance for home appliances, building materials, and automobiles. Further, a Zn—Al—Mg—Si plated steel sheet described in Patent Document 1 is known as a technique for further improving the corrosion resistance of a galvanized steel sheet.
- these galvanized steel sheets are prone to white rust due to zinc corrosion, and it is a known technique to perform chemical conversion treatment such as chromate treatment in order to suppress this.
- the galvanized steel sheet subjected to the chromate treatment is less prone to white rust, but on the other hand, there is a problem that the plating surface turns grayish black when exposed to the atmosphere for a long time.
- this discoloration phenomenon may be referred to as black discoloration.
- blackening occurs remarkably in Zn-Al alloy-plated steel sheets and Zn-Al-Mg alloy-plated steel sheets to which Al or Mg is added during galvanization.
- Patent Documents 2 to 6 are disclosed as techniques for improving the blackening resistance of a galvanized steel sheet.
- Patent Document 2 discloses a technique for treating a galvanized steel sheet with a solution in which Ni ions or Co ions are mixed.
- Patent Document 3 discloses a technique for treating a galvanized steel sheet with a chromate treatment liquid having a specific composition containing nitrate ions.
- Patent Document 4 discloses that 1 to 100 g / l of molybdenum oxygenate ions in terms of Mo, 0.2 to 2 phosphate ions in terms of P / Mo equivalent mass ratio, and 0.03 to 0.001 in terms of Co / Mo equivalent mass ratio.
- Patent Document 3 discloses a technique in which an aqueous treatment liquid containing 3 cobalt ions and 1 to 300 g / l oxycarboxylic acid is applied to a zinc-based plated steel sheet at an Mo equivalent deposition amount of 10 to 120 mg / m 2 .
- Patent Document 5 has a zinc phosphate treatment layer on a galvanization layer, and further has an Ni adhesion portion of 0.1 to 500 mg / m 2 between the galvanization layer and the phosphate treatment layer.
- a technique of an intervening plating layer structure is disclosed.
- Patent Document 6 a phosphate coating is formed on the surface of a molten Zn—Al—Mg alloy-plated steel sheet, and a chemical conversion coating is formed by crosslinking a specific aqueous fluorine-containing resin on the phosphate coating. Further, it is disclosed that the blackening resistance of a hot-dip Zn—Al—Mg alloy-plated steel sheet can be improved.
- a coating film containing scaly Al particles is used.
- Patent Document 7 in a pre-coated metal plate provided with a metallic appearance by a coating film containing an aluminum pigment, the surface of the aluminum pigment is coated in order to prevent blackening of the pigment due to contact between the aluminum pigment and the base metal plate. It is disclosed.
- Patent Document 8 discloses a coating composition containing thin-film scaly aluminum, which is used for coating a steel sheet or the like having a coating-like appearance with excellent design. Things are listed.
- Patent Document 9 discloses a technique for preventing design deterioration such as discoloration of a coating film by inhibiting aluminum from eluting from the coating film in a strongly alkaline environment in a coated steel sheet in which aluminum particles are dispersed in the coating film. Is described.
- Japanese Patent No. 3179446 JP 59-177381 A Japanese Patent Laid-Open No. 10-18048 JP 2001-158972 A JP 2006-225737 A JP 2012-077332 A International Publication No. 2013/065354 Pamphlet JP 2000-136329 A JP 2011-194472 A
- Zn—Al—Mg alloy-plated steel sheets have been developed as galvanized steel sheets with excellent corrosion resistance.
- these steel sheets in which Al and Mg are added to galvanizing are called blackening on the other hand.
- I have a big challenge.
- Zn-Al-Mg-Si alloy-plated steel sheets with excellent corrosion resistance have long-term corrosion resistance and are less likely to cause white rust. Therefore, there is a need to apply them to parts that can be seen from the outside, such as outer panels, in building materials and home appliances. Is growing.
- the design orientation of building structures and home appliances has increased, and the need to suppress blackening of Zn—Al—Mg—Si alloy plated steel sheets has further increased.
- the blackening resistance of Zn—Al—Mg alloy-plated steel sheets including Zn—Al—Mg—Si alloy-plated steel sheets can be improved to some extent.
- these technologies are galvanized during the period in which they are stored or transported in warehouses from the time they are manufactured by steel plate manufacturers until they are used by users such as building material processing manufacturers, home appliance manufacturers, and automobile manufacturers. It is only a technology for suppressing blackening of steel sheets. Therefore, even if these blackening resistance technologies are applied, galvanized steel sheets are incorporated into building material structures, home appliances, automobile parts, etc., and when these products and parts are actually used for a long time, they will turn black. There was a problem that would occur.
- Patent Document 7 prevents blackening of the aluminum pigment contained in the coating film in the precoated steel sheet, and prevents blackening of the base galvanized surface of the precoated steel sheet that has been exposed to the atmosphere for a long time. It does not prevent.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a Zn—Al—Mg—Si alloy-plated steel sheet capable of achieving both corrosion resistance and long-term blackening resistance.
- the inventors have made a film containing aluminum (Al) on the plating layer on the surface of the Zn—Al—Mg—Si alloy-plated steel sheet, and the Al in the film is a plating layer. It is defined as the ratio of the area of the plating layer part covered with Al in the film to the total area of the observation field when the film containing Al is observed from the direction perpendicular to the surface. It has been found that corrosion resistance and long-term blackening resistance can be ensured by adjusting the coverage with Al to 75 to 100%.
- the present invention has been completed based on such knowledge, and the gist of the present invention is as follows.
- a steel plate Zn—Al—Mg—Si alloy plating layer formed on the surface of the steel plate; A film containing Al formed on the plating layer; Including Al in the film containing Al is separated from the plating layer by the presence of an insulating material; And by observing the film containing Al from a direction perpendicular to the surface, the area of the portion of the plating layer concealed by Al in the film is defined as a ratio to the total area of the observation field. The coverage is 75-100%, A galvanized steel sheet with excellent blackening resistance and corrosion resistance.
- the film containing Al is made of an insulating material containing scaly Al particles, and the Al particles are within a range of at least 0.5 ⁇ m from the interface between the film containing Al and the plating layer.
- the film according to [1], wherein the film containing Al is composed of at least two layers of an intermediate layer formed of an insulating material and an Al metal layer in order from the plating layer side.
- Galvanized steel sheet with excellent blackening resistance and corrosion resistance [5] The galvanized steel sheet excellent in blackening resistance and corrosion resistance according to [4], wherein the Al metal layer is composed of an aggregate of scaly Al particles. [6] The galvanized steel sheet excellent in blackening resistance and corrosion resistance according to [1], wherein the insulating substance is a resin. [7] The galvanized steel sheet excellent in blackening resistance and corrosion resistance according to [6], wherein the resin is a polyester resin crosslinked with a melamine compound. [8] The galvanized steel sheet excellent in blackening resistance and corrosion resistance according to [7], wherein the polyester resin has a glass transition temperature Tg of ⁇ 20 to 70 ° C.
- Galvanized steel sheet with excellent blackening resistance and corrosion resistance [13]
- the steel sheet is heated in an induction furnace at a heating rate of 5 to 70 ° C./s to an ultimate plate temperature of 180 to 230 ° C. to form the coating film containing Al.
- the paint is prepared by mixing scale-like Al particles in a solvent together with 100 parts by mass of a water-based emulsion type polyester resin solid content and 10 to 30 parts by mass of a melamine compound solid content as a crosslinking agent.
- the method for producing a galvanized steel sheet excellent in blackening resistance and corrosion resistance according to [13].
- a new Zn-Al-Mg-Si galvanized steel sheet having long-term blackening resistance in addition to the excellent corrosion resistance inherent in the Zn-Al-Mg-Si galvanized steel sheet. Can be provided.
- the galvanized steel sheet of the present invention includes a steel sheet, a Zn—Al—Mg—Si alloy plating layer formed on the surface of the steel sheet, and a film containing Al formed on the Zn—Al—Mg—Si alloy plating layer. Are configured.
- the steel plate is not particularly limited, and a general steel plate such as a hot rolled steel plate or a cold rolled steel plate can be used.
- the steel type is not particularly limited, and for example, Al killed steel, ultra-low carbon steel added with Ti, Nb, etc., and high-tensile steel added with elements such as P, Si, Mn, etc. can be used. is there.
- the Zn—Al—Mg—Si alloy plating layer is a plating layer formed on the surface of the steel sheet.
- This plating layer contains 0.01 to 60% by mass of Al, 0.001 to 10% by mass of Mg and 0.001 to 2% by mass of Si, with the balance being Zn and inevitable impurities. It is.
- Al content of the Zn-Al-Mg-Si alloy plating layer is less than 0.01%, the effect of improving the corrosion resistance of the plated steel sheet due to the addition of Al will not be exhibited, and if it exceeds 60%, the effect of improving the corrosion resistance is saturated. Resulting in.
- a preferable Al content is 1 to 60% by mass, and more preferably 5 to 60% by mass.
- Mg content of the Zn—Al—Mg—Si alloy plating layer is less than 0.001%, the effect of improving the corrosion resistance of the plated steel sheet due to the addition of Mg will not be exhibited, and if it exceeds 10%, Mg will dissolve in the plating bath. It floats as an oxide without being broken (generally called dross), and when galvanized in this plating bath, the oxide adheres to the plating surface layer and causes poor appearance, or a portion that is not plated (generally called non-plating) May occur.
- a preferable Mg content is 1 to 5% by mass, and more preferably 1 to 4% by mass.
- the Si content of the Zn—Al—Mg—Si alloy plating layer is less than 0.001%, the corrosion resistance improvement effect is hardly exhibited. Further, if the Si content is less than 0.001%, an oxide containing Zn, Mg, or Al (generally called dross) is likely to be generated. On the other hand, if it exceeds 2%, Si does not melt in the plating bath and floats as an oxide (generally referred to as dross), and when galvanized in this plating bath, the oxide adheres to the plating surface layer and causes an appearance defect. There is a possibility that a portion that is not plated (generally referred to as non-plating) may occur. In some cases, dross may be slightly generated even when the Si content is about 1%.
- the Si content is preferably 0.01 to 1% by mass, more preferably 0.01 to 0.5% by mass.
- the adhesion amount of the Zn—Al—Mg—Si alloy plating layer on one side of the steel sheet is desirably 10 g / m 2 or more from the viewpoint of corrosion resistance, and desirably 350 g / m 2 or less from the viewpoint of workability.
- the galvanized steel sheet of the present invention which is excellent in blackening resistance and corrosion resistance, has a coating film containing Al on a Zn—Al—Mg—Si alloy plating layer. This film is important for improving blackening resistance.
- blackening is likely to occur in a plated steel sheet having a Zn—Al—Mg—Si alloy plating layer to which Al and Mg are added.
- the main cause of blackening is oxidation of the plating layer surface.
- Covering the Zn-Al-Mg-Si alloy plating layer with a film mainly composed of a film-forming material such as a resin is not sufficient to prevent the permeation of oxygen in the air and is effective in preventing blackening. Absent.
- the blackening can be effectively prevented by making Al present in the coating covering the plating layer. Since Al forms a stable Al oxide on the surface layer in the air atmosphere, it is a very stable metal.
- the Zn—Al—Mg—Si alloy plating layer is unlikely to discolor over a long period of time. Moreover, the fact that Al in the film blocks the path through which oxygen passes through the film greatly contributes to prevention of blackening of the plating layer.
- the film containing Al is observed from a direction perpendicular to the surface thereof, and is defined as the ratio of the area of the portion of the plating layer concealed by Al in the film to the total area of the observation field.
- the coverage with Al is required to be 75 to 100%. The higher the coverage, the better. Therefore, for example, 85% or more, or 95% or more is more preferable.
- the surface oxide of Al is a noble substance than Zn contained in the plated layer of the Zn—Al—Mg—Si alloy-plated steel sheet, it is easy to cause dissimilar metal contact corrosion when they are in contact. Therefore, in the present invention, in order to prevent contact between Al in the coating and the surface of the plating layer, it is also necessary that Al in the coating and the plating layer be separated by an insulating material.
- the distance between the Al and the plating layer in the film may be 0.5 ⁇ m or more, and more preferably 1.0 ⁇ m or more. If the distance is less than 0.5 ⁇ m, the insulating effect cannot be obtained. When the interval exceeds 3 ⁇ m, not only the insulating effect is saturated, but it is difficult to form such an interval. An interval of about 0.5 to 1.5 ⁇ m is most preferable.
- scaly Al particles can be used as the Al in the coating covering the plating layer.
- the scaly Al particles are advantageous because a coating containing Al can be easily formed by applying a coating in which the particles are dispersed on the plating layer.
- the scaly Al particles particles having an average particle diameter of 5 to 30 ⁇ m and an aspect ratio (average particle diameter / thickness ratio) of 20 or more can be used. If the average particle diameter is less than 5 ⁇ m, the coverage with Al tends to be less than 75%, and the concealing effect of the plating layer is weakened. If it exceeds 30 ⁇ m, since the Al particles are too large, a part of the Al particles comes out of the coating film after coating, which may result in an uneven appearance and poor appearance. If the aspect ratio is less than 20, the coverage with Al tends to be less than 75%.
- the upper limit of the aspect ratio is not particularly defined, but is preferably less than 300. Al particles having an aspect ratio exceeding 300 are difficult to produce and difficult to obtain.
- the average particle diameter of each Al particle can be measured by enlarging with an optical microscope or an electron microscope.
- the average particle diameter can also be calculated
- the average thickness of the Al particles necessary for determining the aspect ratio is determined by observing an arbitrary cross section of the arbitrary Al particles with an optical microscope or an electron microscope (in general, the direction perpendicular to the measurement plane of the major axis and the minor axis described above).
- the average thickness of 100 arbitrary Al particles can be used as the average Al particle thickness defined in the present invention.
- the Al-containing film on the plating layer can be formed by, for example, a paint containing scaly Al particles.
- the Al particles are oriented in a direction parallel or substantially parallel to the lower plating layer, It is dispersed in a continuous phase formed by a film forming component as an insulating material and collected on the upper part of the film. Only the continuous phase exists at the lower part of the film, and the Al particles are isolated from the surface of the plating layer with the above-mentioned interval.
- the film containing Al may be composed of at least two layers of an intermediate layer formed of an insulating material and an Al metal layer in order from the plating layer side.
- the Al metal layer can be formed as an aggregate of scaly Al particles on an intermediate layer formed using an insulating material on the plating layer, or formed as a continuous Al layer by plating. May be.
- the above scaly Al particles can be used.
- the aggregate of the scale-like Al particles is present in the coating formed by the coating containing the scale-like Al particles described above, in which the particles are dispersed in the continuous phase of the resin (the resin exists between adjacent particles). In contrast to the higher particle concentration coating, there is a possibility of particle contact, but in the lower particle concentration particle contact is negligible (if any).
- the intermediate layer resin is formed using an adhesive or a binder, and adjacent particles are fixed by a resin that fills a gap between them while contacting each other. Therefore, in the present invention, such an aggregate of scaly Al particles is included in the “Al metal layer”.
- the thickness of the intermediate layer may be 0.5 ⁇ m or more, and the thickness of the Al metal layer may be 1.5 to 9.5 ⁇ m. If the thickness of the intermediate layer is less than 0.5 ⁇ m, the insulating effect cannot be obtained and the corrosion resistance is poor.
- the thickness of the intermediate layer is more preferably 0.5 to 3 ⁇ m, still more preferably 0.5 to 1.5 ⁇ m. If it exceeds 3 ⁇ m, the insulating effect is saturated, so there is no need to apply any more.
- the thickness of the Al metal layer is less than 1.5 ⁇ m, it is insufficient for concealing the lower plating layer, and if it exceeds 9.5 ⁇ m, the workability may be inferior.
- the thickness of the Al metal layer is preferably 2.5 to 9.5 ⁇ m, and more preferably 3.5 to 9.5 ⁇ m.
- the Al material in the coating containing Al may be made of pure Al or an Al alloy containing Al as a main component.
- Al alloy generally known Al alloys can be used.
- Resin is suitable as the insulating material in the coating containing Al.
- the insulating material plays a role of preventing corrosion of the plating layer due to different metal contact between Al in the coating and the plating layer in order to improve blackening resistance, and preferably has an insulation resistance of 10 ⁇ or more. .
- the film containing Al is formed of a resin in which scaly Al particles are dispersed, it is preferably a polyester resin crosslinked with a melamine compound.
- This polyester resin preferably has a glass transition temperature Tg of ⁇ 20 to 70 ° C. and a number average molecular weight of 15000 to 25000. If the glass transition temperature Tg is less than ⁇ 20 ° C., the adhesion of the processed part of the coating layer containing Al may be lowered. If it exceeds 70 ° C., the workability of the coating layer containing Al is lowered, and there is a risk that the coating layer may crack during processing. A more preferable Tg is 0 to 50 ° C.
- the glass transition temperature Tg can be measured with a differential scanning calorimeter called DSC or a thermomechanical analyzer called TMA.
- DSC differential scanning calorimeter
- TMA thermomechanical analyzer
- the resin for the intermediate layer when the coating film containing Al is composed of at least two layers of the intermediate layer and the Al metal layer thereon is not particularly limited, and generally known resins can be used.
- a polyester resin, an epoxy resin, a urethane resin, an acrylic resin, a melamine resin, or the like can be used.
- polyester resins and urethane resins excellent in workability are more suitable.
- Epoxy resins are also preferred because of their excellent adhesion to metals.
- the intermediate layer is formed by dissolving these resins in a solvent or by emulsifying and applying a coating solution dispersed in water or a solvent, the workability at the time of production is improved and it is more efficient. Further, adding a curing agent such as melamine or isocyanate to these resins to form a thermosetting type is more preferable because adhesion with an Al metal layer or a Zn—Al—Mg—Si alloy plating layer is increased. Since it is excellent in adhesiveness with the film layer containing Al, etc. that it is the same resin as the film layer containing Al, it is more suitable.
- a curing agent such as melamine or isocyanate
- the coating containing Al is composed of an intermediate layer and an Al metal layer thereon
- a layer other than these may be present.
- an Al metal layer is formed by a plating method, it is possible to provide a layer effective for promoting adhesion of plating to the intermediate layer between the intermediate layer and the Al metal layer.
- additives such as pigments, aggregates and rust preventives can be added as necessary.
- Addition of pigments and aggregates is more preferable because the strength of the film is increased and the adhesion to the Al and Zn—Al—Mg—Si alloy plating layer is increased.
- the addition of a rust preventive agent is more preferable because the corrosion resistance of the Zn—Al—Mg—Si alloy plating layer is improved. What is necessary is just to determine the addition amount of an additive suitably so that it may not become disadvantageous for the membrane
- the film thickness of the film containing Al is preferably in the range of 2 to 10 ⁇ m. If it is less than 2 ⁇ m, the plating layer may not be concealed and the coverage may be less than 75%. If it exceeds 10 ⁇ m, the workability may be inferior.
- the film thickness can be measured by observing the cross section with an electron microscope using an optical microscope.
- the portion where the Al particles dispersed in the continuous phase of the resin are not present the portion containing only the resin, or independently from the Al metal layer.
- An intermediate layer made of resin is located. And those thickness is as having demonstrated previously.
- a clear resin film can be provided on a film containing Al.
- the clear resin film can improve the fingerprint resistance particularly when the film containing Al has an Al metal layer.
- the clear resin film also has an effect of smoothing the surface of the plated steel sheet by filling the unevenness of the film surface containing Al.
- the type of clear resin is not particularly limited, and generally known resins such as polyester resins, epoxy resins, urethane resins, acrylic resins, melamine resins, and the like can be used. However, since there are many cases in which galvanized steel sheets are molded and used, polyester resins and urethane resins excellent in workability are more suitable. Epoxy resins are also preferable because they have excellent adhesion to metal (here, Al exposed on the surface of a film containing Al). It is more preferable to add a curing agent such as melamine or isocyanate to the clear resin to obtain a thermosetting type because the hardness of the film is improved and the scratch resistance is excellent.
- a curing agent such as melamine or isocyanate
- a rust inhibitor may be added as necessary. Addition of a rust inhibitor is preferable because the corrosion resistance of the film containing Al is improved. Furthermore, the addition of pigments and aggregates is more preferable because the strength of the clear resin film increases and the adhesion with the film containing Al increases.
- the thickness of the clear resin film layer is preferably in the range of 0.2 to 20 ⁇ m. If the thickness is less than 0.2 ⁇ m, the effect on fingerprint resistance may be reduced. If the thickness exceeds 20 ⁇ m, it is generally called boiling when applied using a solvent-soluble or emulsion-dispersed resin coating solution and then dried and cured. Film defects may occur.
- the Al particles When Al particles are used in a film containing Al, the Al particles may be slightly diffused and dispersed in the upper clear resin film depending on the production method.
- the part where Al particles are diffused is regarded as a film containing Al, and the thickness up to that part (distance from the surface of the plating layer) can be the film thickness of the film containing Al.
- the film thickness of the clear resin film means the thickness of a portion where no Al particles are present (portion containing only resin).
- a known chemical conversion treatment may be applied to the surface of the Zn—Al—Mg—Si alloy plating layer.
- applicable chemical conversion treatments include chromate treatment, phosphoric acid treatment, silica treatment, Mo treatment, Co treatment, Ni treatment, and Zr treatment.
- the above-described chemical conversion treatment can be performed on the Al metal layer.
- the coating containing Al is composed of an insulating material containing scaly Al particles, and the Al particles are within a range of at least 0.5 ⁇ m from the interface between the coating containing Al and the plating layer.
- the non-existing galvanized steel sheet contains scaly Al particles and an insulating substance in a solvent, and has a viscosity of 150 to 1500 mPa ⁇ s at a shear rate of 1 s ⁇ 1 measured by a rotational viscometer at 25 ° C., and A paint having a viscosity of 50 to 150 mPa ⁇ s at a shear rate of 10000 s ⁇ 1 measured at 25 ° C.
- the steel plate is heated at a heating rate of 5 to 70 ° C. / It can be manufactured by heating in an induction heating furnace to an ultimate plate temperature of 180 to 230 ° C. in s to form the coating film containing Al.
- the inventors prepare a solution (hereinafter also referred to as “coating liquid” or “paint”) in which scaly Al particles are dispersed in a resin solution that is an insulating substance, and the viscosity is set to a specific condition. When adjusted, the viscosity is controlled in the drying and baking process of the coating liquid applied to the plated steel sheet of the base material, and the scale-like Al particles are lifted by the convection of the coating liquid, and the lower layer does not contain Al particles. I found that the part was expressed. That is, the inventors measured the viscosity measured by a rotational viscometer at 25 ° C.
- a water-based emulsion type polyester resin can be suitably used as the insulating material resin.
- a melamine compound as a cross-linking agent and making it a thermosetting resin, the adhesion to the Zn—Al—Mg—Si alloy plating layer can be enhanced.
- the water-based emulsion-type polyester resin for example, Bhironal (registered trademark) series manufactured by Toyobo Co., Ltd. can be used.
- the melamine compound as a crosslinking agent include CYMEL (trademark) series manufactured by CYTEC.
- a melamine crosslinking agent having a solid content of 10 to 30 parts by mass can be used with respect to 100 parts by mass of a solid content of an aqueous emulsion type polyester resin.
- the amount of the melamine crosslinking agent used is more preferably 10 to 20 parts by mass with respect to 100 parts by mass of the water-based emulsion type polyester resin solid content.
- the coating material can be prepared by adding a water-based emulsion type polyester resin, a melamine cross-linking agent, and scaly Al particles (as described above) to an aqueous solvent such as water or alcohol and stirring. .
- the blending ratio of the water-based emulsion type polyester resin and the melamine crosslinking agent is as described above. What is necessary is just to determine the compounding quantity of scale-like Al particle
- the distance between the Al in the film and the plating layer varies depending on the viscosity condition of the paint and the dry baking condition. Therefore, the blending amount of the scaly Al particles in the paint may be determined by experiment in consideration of these requirements.
- the paint prepared in this way usually does not satisfy the above-mentioned viscosity condition.
- a viscosity modifier can be used.
- a liquid such as a coating liquid has a high viscosity in a low shear rate region and a low viscosity in a high shear rate region is generally called a shearing effect.
- a shear thinning effect it is common to use a concentrated dispersion of a liquid to which high-concentration granular fine particles are added.
- a thick dispersion system it is said that the interparticle distance between the fine particles added to the coating liquid is shortened, the attractive force between the particles is increased, and the shearing effect is exhibited.
- a method for controlling the viscosity of the same liquid in different shear rate regions by adding a specific additive is known.
- an additive generally called a rheology control agent is used.
- the rheology control agent slightly reacts with the resin in the coating solution to form a network phase in the coating solution.
- a general rheology control agent is added to the coating liquid used in the present invention, the required coating liquid viscosity condition described above cannot be satisfied.
- a specific viscosity adjusting agent can be used to satisfy the above-mentioned conditions for the viscosity of the coating liquid.
- the viscosity modifier used in the present invention does not react with the resin in the coating liquid, and its molecular end chain is bonded to the resin in the coating liquid with a weak binding force such as adsorption.
- Type of substance One example thereof is a surfactant mainly composed of urethane-modified polyether.
- “SN thickener 629N” manufactured by San Nopco can be used.
- the addition amount of the viscosity modifier in the present invention varies depending on the resin type and solvent type used in the coating liquid, and is appropriately selected as necessary.
- the viscosity modifier can be used in an amount of 0.2 to 10 parts by mass with respect to 100 parts by mass of the aqueous emulsion type polyester resin dispersion. If it is less than 0.2 parts by mass, it is difficult to obtain the necessary coating liquid viscosity conditions, and if it exceeds 10 parts by mass, the water-based emulsion type polyester resin may be gelled.
- a preferred addition amount of the viscosity modifier is 0.2 to 1.0 part by mass with respect to 100 parts by mass of the water-based emulsion type polyester resin dispersion.
- the heating rate when the heating rate is higher than 70 ° C./s, the heating rate is too high, so that the coating is cured in a state where the coating is boiled in the solvent drying process, and the coating defect (generally, the trace of bubbles due to boiling remains in the film) There is a risk that this will occur).
- the coating film surface layer tends to be slightly uncured, which causes the coating film to peel off. If the ultimate plate temperature is less than 180 ° C., the film may not be cured and the surface of the film may be undried, and if the surface of the coating film is uncured (undried), the coating film may be peeled off.
- the paint When the ultimate plate temperature exceeds 230 ° C., the paint is cured in a state where the paint is boiled in the solvent drying process, and there is a risk that a coating defect (generally referred to as boiling) in which traces of bubbles due to boiling remain in the film may occur. . Furthermore, since the coating film is hardened by baking at a high temperature, it becomes hard, and the coating film is easily cracked or peeled off by processing. Since the galvanized steel sheet is generally used after being processed, a processed part where the coating is cracked or peeled off by processing is likely to be a source of corrosion.
- a coating defect generally referred to as boiling
- the coating solution is applied to the surface of the plated layer of the base-plated steel sheet at room temperature or slightly higher than room temperature (for example, about 30 ° C or 40 ° C), and heating is started for dry baking. In this case, regions having different temperatures are generated, Marangoni convection is generated, and the coating liquid starts to flow.
- the coating liquid viscosity is low, so that Al particles float on the upper part of the coating liquid on the plating layer, and the dry baking process proceeds.
- the coating liquid viscosity increases and the Al particles do not settle, so a film containing no Al particles is formed in the lower layer.
- the Al particles generated by Marangoni convection generated in the process of heating and drying and baking the coating liquid applied to the plating surface is controlled so that the Al particles are concentrated on the upper layer of the coating liquid in the initial stage of heating.
- the solvent of the coating solution is volatilized and the resin is cured, and a film in which Al particles are not present within the range of at least 0.5 ⁇ m from the interface with the plating layer is formed.
- the film having a unique constitution of the present invention in which Al particles are not present within the range of at least 0.5 ⁇ m from the interface with the plating layer is brought about by heat treatment in a high temperature range where the ultimate plate temperature is 180 to 230 ° C.
- the coating liquid for forming such a film is required to use a liquid that satisfies the viscosity conditions defined by the measured values at 25 ° C. (different shear rates). It may seem strange.
- the inventors have used a paint that satisfies this viscosity condition and formed under the above-mentioned dry baking conditions, so that a film in which Al particles are not actually present in the range of at least 0.5 ⁇ m from the interface with the plating layer. It was found that it was obtained (see Examples).
- a galvanized steel sheet composed of at least two layers of an intermediate layer formed of an insulating material and an Al metal layer in order from the plating layer side, which contains Al
- A An intermediate layer of an insulating material is formed on the galvanized layer on the surface of the steel plate, and then an Al metal layer is formed thereon by a plating method
- B Applying a liquid material for forming an intermediate layer of an insulating material on the galvanized layer on the surface of the steel plate, spraying scaly Al particles on the liquid material, and then solidifying the liquid material, Forming an intermediate layer of insulating material and an Al metal layer thereon; Can be manufactured.
- the insulating material for the intermediate layer generally known materials can be used.
- polyester resin, epoxy resin, urethane resin, acrylic resin, melamine resin, etc. are used. be able to. Since there are many cases in which galvanized steel sheets are molded and used, polyester resins and urethane resins having excellent processability are more suitable. Epoxy resins are also preferred because of their excellent adhesion to metals.
- the intermediate layer is formed by dissolving these resins in a solvent or by emulsifying and applying a coating solution dispersed in water or a solvent, the workability at the time of production is improved and it is more efficient.
- thermosetting type because adhesion with an Al metal layer or a Zn—Al—Mg—Si alloy plating layer is increased.
- the insulation resin intermediate layer is made of a paint in which the insulation resin is dissolved in a solvent such as thinner, or an emulsion type paint dispersed in water, and after this is applied, it is dried and baked or at a temperature lower than the melting point of Zn. It can be easily formed on the Zn—Al—Mg—Si alloy plating layer by melting and coating the Zn—Al—Mg—Si alloy plating layer.
- a generally known plating method for example, a vacuum deposition plating method, an electroplating method, an electroless plating method, is formed on an intermediate layer of a previously formed insulating resin.
- the Al metal layer can be formed using such as. Among these, it is preferable to use a vacuum evaporation plating method.
- the hot dip galvanizing method is not suitable because the melting temperature of Al is higher than the melting temperature of Zn, which is the main component of the Zn—Al—Mg—Si alloy plating, and the plating layer melts.
- the Al metal layer is formed by the method (b) above, a paint for forming an intermediate layer on the galvanized layer (same as described above for the method (a)) is applied. Then, the scaly Al particles are sprayed on the applied paint, and then the intermediate paint is solidified by heating to form an Al metal layer as an aggregate of scaly Al particles.
- the Al particles can be fixed on the insulating film layer by using the resin of the intermediate layer as an adhesive or a binder.
- the ratio of the resin and the cross-linking agent, the heating conditions for dry baking of the paint, etc. are formed by a coating liquid in which Al particles are dispersed. This is the same as that described for the method.
- a clear resin film is formed on a film containing Al
- a general clear resin as described above is dissolved in a solvent such as thinner, or an emulsion type coating liquid in which water is dispersed contains Al. It can be formed by means such as drying and baking after coating on the film, or melting the clear resin at a temperature lower than the melting point of Zn and coating the melt on the film containing Al.
- the method for applying the paint when forming the Al-containing film and the clear resin film is not particularly limited, and a general method used for coating a steel sheet can be used.
- a coating method using a roll coater or a curtain coater can be suitably used.
- a general method used for coating a steel sheet can also be used for drying and baking the paint.
- Al powder is dispersed in a mixed solution of water emulsion type polymer polyester and melamine resin, and an additive “SN thickener 629N” containing pure water and urethane-modified polyether manufactured by San Nopco is added to the obtained dispersion as appropriate.
- a coating liquid was prepared by adjusting the viscosity at 30 ° C. at a shear rate of 1 S ⁇ 1 (low shear viscosity) and the viscosity at a shear breaking rate of 10000 S ⁇ 1 (high shear viscosity).
- Water-emulsion-type high molecular weight polyesters include Toyobo Co., Ltd.
- Vylonal (registered trademark) MD-1480 (number average molecular weight 15000, Tg 20 ° C.), Vylonal (registered trademark) MD-1220 (number average molecular weight 15000, Tg 67 ° C.) (Registered trademark) MD-1100 (number average molecular weight 20000, Tg 40 ° C.), Vylonal® (registered trademark) MD-1985 (number average molecular weight 25000, Tg-20 ° C.), Vylonal® MD-1335 (number average molecular weight 8000) , Tg 4 ° C.), Vylonal® MD-1500 (number average molecular weight 8000, Tg 77 ° C.).
- Al particles include “Sap 561PS” (average particle size 16 ⁇ m, aspect ratio 20 or more) manufactured by Showa Aluminum Powder, “Sap 2173SW” (average particle size 6 ⁇ m, aspect ratio 20 or more) manufactured by Showa Aluminum Powder, Showa Aluminum “Sap 720N” (average particle size 30 ⁇ m, aspect ratio 20 or more) manufactured by Powder Co., Ltd., and “Aluminum powder” manufactured by Kanto Chemical Co., Ltd., with the same particle size using different mesh screens, and only fine particles taken out ( An average particle size of 20 ⁇ m and an aspect ratio of less than 20) were used.
- the coating liquid is applied onto the plating layer of the steel sheet with a curtain coater, heated in an induction heating furnace at a heating rate of 50 ° C./s until reaching a predetermined plate temperature, cured with resin, then cooled with water, and contains Al. A film was formed. Then, the total film thickness of the film, the thickness of the part in which no Al particles existed in the film (part of resin only), and the Al coverage were measured.
- the film thickness was measured by observing an arbitrary vertical section exposed by embedding a galvanized steel sheet in a resin and polishing it at a magnification of 500 using a traveling electron microscope (SEM). As sought.
- the Al coverage was determined as an area ratio in which Al in the entire visual field was detected when EPMA analysis was performed on an arbitrary plane of the coating and element mapping was performed on Al with a 100-fold visual field.
- this method is referred to as “particle dispersion method”.
- samples in which the addition amount of Al particles and the addition amount of melamine resin were changed as necessary were also prepared.
- Byron (registered trademark) 29CS a cyclohexanone / solvesso mixed organic solvent-soluble amorphous polyester resin manufactured by Toyobo Co., Ltd.
- Byronal (registered trademark) MD- a water-dispersed polymer polyester manufactured by Toyobo Co., Ltd. 1220 were prepared as resin coating solutions, respectively.
- An insulating layer as an intermediate layer produced using Byron (registered trademark) 29CS is hereinafter referred to as “solvent type”
- an insulating layer produced using Byronal (registered trademark) MD-1220 is hereinafter referred to as “water dispersion type”. .
- solvent type 0.5% by mass of Catalyst TM600, an acidic catalyst manufactured by Mitsui Cytec Co., Ltd., was added to a mixed solution of polyester resin and melamine resin. No catalyst was added to the “water-dispersed” coating solution.
- the resin coating solution is applied on the previously prepared plating layer with a bar coater, dried and cured in a hot air oven under the condition that the ultimate plate temperature is 200 ° C., and then cooled with water, so that the insulating layer is formed on the plating layer. Formed.
- an Al metal layer was formed on the insulating layer by vapor deposition of Al with a vacuum vapor deposition plating apparatus.
- this method is referred to as “evaporation method”.
- the film thickness and coverage of the film including the Al metal layer formed by plating were measured as described above.
- the resin coating solution prepared as the coating solution for the insulating layer as the intermediate layer described in the formation of the coating including the Al metal layer by plating is applied with a bar coater, and the ultimate plate temperature 230 is applied in a hot air drying furnace. After drying and curing at a temperature of 0 ° C., a clear resin film layer was formed by cooling with water.
- a galvanized steel sheet was produced as described above. Details of the manufactured galvanized steel sheets are shown in Tables 1 to 4.
- the produced galvanized steel sheet was cut into a size of 70 mm wide ⁇ 150 mm long, cut scratches reaching the steel sheet substrate were provided on the evaluation surface, and the four cut end surfaces were sealed with tape to prepare a sample for corrosion resistance test. .
- the salt spray test was implemented by the method of 9.1 of JISK5400. The salt water was sprayed so as to be sprayed on the evaluation surface. The test time was 240 hours.
- any of the corrosion resistance and blackening resistance evaluated as “x” was regarded as a comparative example without exception.
- the fingerprint resistance is “X” or “ ⁇ ”
- the present invention example is used if both the corrosion resistance and blackening resistance are “ ⁇ ” or more.
- Tables 5 and 6 show the evaluation results of the galvanized steel sheets produced by the “particle dispersion method”. No. 1) -1 to 24 and No. 1 2) In the present invention of -1 to 11, excellent evaluation results were shown in any of the items of workability, corrosion resistance, blackening resistance, and fingerprint resistance.
- Invention Example No. 1) -4 has a tendency that the corrosion resistance is lowered when the area where Al is not present in the lower layer of the coating film is 0.5 ⁇ m.
- Comparative Example No. 1) -26 is inadequate due to its poor corrosion resistance because the area where Al is not present in the lower layer of the coating film is 0 ⁇ m, that is, Al and the plating layer are in contact.
- Invention Example No. In 1) since the Al metal film layer is as thin as 2 ⁇ m, the Al coverage is as low as 75% and the blackening resistance tends to decrease. Comparative Example No. 1) -27 is unsuitable because the Al metal film layer is thinner and the coverage is less than 75%, resulting in poor blackening resistance. Invention Example No. In 1) -8, the workability is lowered because the Al metal film layer is as thick as 20 ⁇ m.
- Invention Example No. 1) -16 has a large amount of Mg added to the hot dip galvanized layer as 10% by mass, so poor appearance due to dross where oxides (dross) oxidized without being dissolved in the plating bath adhere to the plated layer Slightly occurred. Appearance defects due to dross tend to be disliked in places where people can see the eyes (for example, outer panels of home appliances and buildings) from the viewpoint of design and design. . However, since the appearance defect due to dross is simply an oxide adhered to the plating layer, it can be used as a plated steel sheet without any problem if there is no problem in performance.
- Invention Example No. 1) -21 has a large amount of Si added to the hot dip galvanized layer as 2% by mass, so that the appearance defect due to dross that the oxide (dross) oxidized without being dissolved in the plating bath adheres to the plated layer. Slightly occurred.
- the Si addition amount is 1 mass%.
- -20 was slight, but there was an appearance defect due to dross. Appearance defects due to dross tend to be disliked in places where people can see the eyes (for example, outer panels of home appliances and buildings) from the viewpoint of design and design. .
- the appearance defect due to dross is simply an oxide adhered to the plating layer, it can be used as a plated steel sheet without any problem if there is no problem in performance.
- Comparative Example No. 1) -25 is not suitable because it does not contain Al or Mg in the galvanized layer, and is inferior in corrosion resistance.
- Comparative Example No. 1) -30 has a heating rate of less than 5 ° C./s when baking the coating liquid to form an Al metal film layer, and the heating rate is slow, so that the Al particles are less likely to float, and the Al particles are plated with the film. Al particles are present within a range of 0.5 ⁇ m from the interface with the layer, resulting in poor corrosion resistance.
- Comparative Example No. 1) -31 has a heating rate of more than 70 ° C./s when baking the coating liquid to form an Al metal film layer, so that the paint is cured in a state where the paint boiled in the solvent drying process. There was a coating defect called boiling where traces of bubbles due to boiling remained in the film.
- -35 has a final plate temperature of more than 230 ° C. when the coating liquid is baked to form an Al metal film layer, so that the paint is cured while the paint is boiling in the solvent drying process. There was a coating defect called boiling where traces of bubbles due to boiling remained in the film. Furthermore, since the coating film was cured at a high temperature, the coating film was hardened, and when it was bent 180 degrees, the coating film was cracked or peeled off. Since galvanized steel sheets are generally used after being processed, there is a risk of corrosion from the processed parts where the coating film cracks or peels off due to processing, which is unsuitable because the product value is significantly reduced. .
- Comparative Example No. 2) -12 is not suitable because the aspect ratio of Al particles is less than 20, the Al coverage is low, and the blackening resistance is poor.
- Invention Example No. 2) -4 is Vylonal (registered trademark) MD-1335 (number average molecular weight 8000, Tg 4 ° C.) having a low number average molecular weight. Since 2) -5 uses Vylonal (registered trademark) MD-1500 (number average molecular weight 8000, Tg 77 ° C.) having a high Tg, the workability tends to be lowered.
- the present invention No. 2) -1 is Vylonal (registered trademark) MD-1220 (number average molecular weight 15000, Tg 67 ° C.) having a high Tg. 2) -3 has a high number average molecular weight and a low Tg Vyronal (registered trademark) MD-1985 (number average molecular weight 25000, Tg-20 ° C.), so that the processability tends to decrease. .
- Table 7 shows the evaluation results of the galvanized steel sheets produced by the “evaporation method”. As shown in Table 7, no. 3) In Examples 1 to 25 of the present invention, excellent evaluation results were shown in any of the items of workability, corrosion resistance, blackening resistance, and fingerprint resistance.
- No. of the present invention example. 3) -14 had an insulating layer (intermediate layer) film thickness of more than 1.5 ⁇ m, and the insulating film layer was slightly inferior in workability compared to other invention examples of 1.5 ⁇ m or less. Other items were good.
- No. of the present invention example. 3 -20 had no clear resin film on the Al metal film layer, and was inferior to fingerprint resistance compared to other invention examples having a clear resin film. Excellent results.
- 3) -8 has a Si content of less than 0.001% by mass in the hot-dip galvanized layer, and tends to have a slightly lower corrosion resistance than the other invention examples in which Si is added in an amount of 0.001% by mass or more.
- the plating appearance failure due to dross was also severe, so it is not suitable.
- the hot-dip galvanized layer had a Si content of 2% by mass, and a slight dross appearance was observed. However, since the dross appearance is slight, it is considered that the quality level has no problem in actual use.
- No. of the present invention example. 3) -11 has a Si content exceeding 2% by mass and the Si addition amount is 2% by mass or less, and the appearance of plating by dross tends to be inferior to that of the other invention examples. It was excellent.
- Invention No. of the present application. 3) -24 had a coating film thickness of 25 ⁇ m, and a coating defect called boiling occurred.
- Boiling is a process of drying and baking the coating film, and is a coating film defect in which a trace of boiling of the solvent remains in a crater form, and is likely to occur when the film thickness is thick. For this reason, in places where people can see it (for example, outer panel panels of home appliances, buildings, etc.), those with poor appearance tend to be disliked from the viewpoint of design and design. It is better not to occur. However, if there is no problem in performance, it looks bad but can be used without any problem.
- the comparative example No. 3) -26 was inferior in blackening resistance because the Al metal film layer was not formed on the Zn—Al—Mg—Si alloy plating layer.
- Comparative Example No. 3) -27 is not suitable because it does not have an insulating film layer made of an insulating material between the hot-dip galvanized layer and the Al metal layer, and therefore has poor corrosion resistance.
- Table 8 shows the evaluation test results of the galvanized steel sheets produced by the “particle spraying method”. No. of the example of the present invention. 4) -1 to 19 and 21 to 24 were excellent in all of workability, corrosion resistance, blackening resistance, and fingerprint resistance.
- a Zn—Al—Mg—Si galvanized steel sheet having both excellent corrosion resistance and long-term blackening resistance can be provided.
- the process can be omitted and the manufacturing cost of the product can be reduced. Therefore, the present invention can be said to be an invention with extremely high industrial value.
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Abstract
Description
[1]鋼板と、
前記鋼板の表面に形成されたZn-Al-Mg-Si合金めっき層と、
前記めっき層上に形成された、Alを含む皮膜と、
を含み、
前記Alを含む皮膜中のAlは絶縁物質の存在によって前記めっき層と隔てられていること、
かつ、前記Alを含む皮膜をその表面に垂直な方向から観測して、前記めっき層の当該皮膜中のAlにより隠蔽されている部分の面積の観測視野の全面積に対する比として定義されるAlによる被覆率が75~100%であること、
を特徴とする耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[2]前記Alを含む皮膜が鱗片状のAl粒子を含む絶縁物質で構成されており、当該Al粒子は、前記Alを含む皮膜と前記めっき層との界面から少なくとも0.5μmの範囲内に存在しないことを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[3]前記Al粒子の平均粒径が5~30μm、アスペクト比が20以上であることを特徴とする、[2]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[4]前記Alを含む皮膜が、前記めっき層側から順に、絶縁物質で形成された中間層とAl金属層の少なくとも2層で構成されていることを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[5]前記Al金属層が鱗片状Al粒子の集合体からなることを特徴とする、[4]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[6]前記絶縁物質が樹脂であることを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[7]前記樹脂がメラミン化合物で架橋されたポリエステル樹脂であることを特徴とする、[6]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[8]前記ポリエステル樹脂のガラス転移温度Tgが-20~70℃、数平均分子量が15000~25000であることを特徴とする、[7]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[9]前記Alを含む皮膜の厚みが2~10μmであることを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[10]前記Alを含む皮膜の上にクリヤー樹脂皮膜を有することを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[11]前記クリヤー樹脂皮膜の厚みが0.2~20μmであることを特徴とする、[10]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[12]前記亜鉛めっき層が0.01~60質量%のAl、0.001~10質量%のMg及び0.001~2質量%のSiを含むことを特徴とする、[1]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
[13][2]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法であって、溶剤中に鱗片状のAl粒子と絶縁物質を含有し、25℃で回転粘度計により測定したせん断速度1s-1の条件での粘度が150~1500mPa・sであり、かつ、25℃で回転粘度計により測定したせん断速度10000s-1での粘度が50~150mPa・sである塗料を鋼板の表面の亜鉛めっき層上に塗布し、次いで前記鋼板を加熱速度5~70℃/sで180~230℃の到達板温まで誘導加熱炉で加熱して、前記Alを含む皮膜を形成することを特徴とする、耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[14]鱗片状Al粒子を水系エマルジョン型ポリエステル樹脂固形分100質量部と架橋剤としてのメラミン化合物固形分10~30質量部とともに溶媒中で混合することにより、前記塗料を調製することを特徴とする、[13]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[15]前記塗料の粘度を粘度調整剤を用いて調整することを特徴とする、[13]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[16]前記粘度調整剤として、前記水系エマルジョン型ポリエステル樹脂分散液100質量部に対し0.2~10質量部のウレタン変性ポリエーテルを主成分とする界面活性剤を用いることを特徴とする、[15]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[17]前記Al粒子として、平均粒径が5~30μm、アスペクト比が20以上のAl粒子を用いることを特徴とする、[13]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[18][4]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法であって、
(a)鋼板の表面の亜鉛めっき層の上に絶縁物質の中間層を形成し、次いでその上にめっき法によりAl金属層を形成するか、あるいは、
(b)鋼板の表面の亜鉛めっき層の上に絶縁物質の中間層を形成するための液状材料を塗布し、この液状材料の上に鱗片状Al粒子を吹きかけ、その後前記液状材料を固化させて、絶縁物質の中間層とその上のAl金属層とを形成する、
ことを特徴とする耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
[19]前記めっき法が真空蒸着めっき法であることを特徴とする、[18]に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
本発明の亜鉛めっき鋼板は、鋼板と、鋼板の表面に形成されたZn-Al-Mg-Si合金めっき層と、Zn-Al-Mg-Si合金めっき層上に形成されたAlを含む皮膜と、を具備して構成されている。
(a)鋼板の表面の亜鉛めっき層上に絶縁物質の中間層を形成し、次いでその上にめっき法によりAl金属層を形成するか、あるいは、
(b)鋼板の表面の亜鉛めっき層上に絶縁物質の中間層を形成するための液状材料を塗布し、この液状材料の上に鱗片状Al粒子を吹きかけ、その後前記液状材料を固化させて、絶縁物質の中間層とその上のAl金属層とを形成して、
製造することができる。
厚さ1mmの冷延鋼板を、各種金属を添加した450℃のZn-Al-Mg-Siめっき浴に3秒間浸漬して溶融めっきを行い、N2ワイピングでめっき付着量を片面90g/m2に調整することで、鋼板にZn-Al-Mg-Siめっき層を形成した。
水エマルジョン型高分子ポリエステルとメラミン樹脂の混合溶液にAl粉末を分散させ、得られた分散液に純水とサンノプコ社製のウレタン変性ポリエーテルを含む添加剤「SNシックナー629N」を適宜添加することで、30℃でせん断速度1S-1のときの粘度(低せん断粘度)とせん断断速度10000S-1のときの粘度(高せん断粘度)を調整した塗液を作製した。水エマルジョン型高分子ポリエステルには東洋紡績社製のバイロナール(登録商標)MD-1480(数平均分子量15000、Tg20℃)、バイロナール(登録商標)MD-1220(数平均分子量15000、Tg67℃)、バイロナール(登録商標)MD-1100(数平均分子量20000、Tg40℃)、バイロナール(登録商標)MD-1985(数平均分子量25000、Tg-20℃)、バイロナール(登録商標)MD-1335(数平均分子量8000、Tg4℃)、バイロナール(登録商標)MD-1500(数平均分子量8000、Tg77℃)を用いた。メラミン樹脂には三井サイテック社製のサイメル(登録商標)303を用いた。Al粒子には昭和アルミパウダー社製の「Sap 561PS」(平均粒径16μm、アスペクト比20以上)、昭和アルミパウダー社製の「Sap 2173SW」(平均粒径6μm、アスペクト比20以上)、昭和アルミパウダー社製の「Sap 720N」(平均粒径30μm、アスペクト比20以上)、関東化学社の試薬「アルミニウム粉末」をメッシュの異なる篩にて粒子径を揃えて、細かい粒子のみを取り出したもの(平均粒径20μm、アスペクト比20未満)を用いた。ポリエステル樹脂とメラミン樹脂は、ポリエステル樹脂固形分:メラミン樹脂固形分質量比=100:20で配合し、Al粒子はポリエステル樹脂:Al粒子質量比100:15となるように添加した。塗液を鋼板のめっき層上にカーテンコーターで塗布し、50℃/sの加熱速度で所定の到達板温に至るまで誘導加熱炉で加熱して樹脂を硬化後、水冷して、Alを含む皮膜を形成した。その後、皮膜の総膜厚と皮膜中のAl粒子の存在しない部分(樹脂のみの部分)の厚さ、およびAl被覆率を測定した。膜厚は、亜鉛めっき鋼板を樹脂に埋め込み、研磨して露出させた任意の垂直断面を走行型電子顕微鏡(SEM)を用いて500倍で観察して測定し、任意の垂直断面5箇所の平均として求めた。Al被覆率は、皮膜の任意の平面をEPMA分析し、Alについて100倍視野で元素マッピングしたときに全視野中のAlが検出された面積比として求めた。これ以降、本方法を「粒子分散法」と称す。
また、粒子分散法においては、必要に応じてAl粒子の添加量やメラミン樹脂の添加量を変化させたサンプルも作成した。
東洋紡績社製のシクロヘキサノン/ソルベッソ混合系の有機溶剤溶解型の非晶性ポリエステル樹脂であるバイロン(登録商標)29CSと、東洋紡性社製の水分散高分子ポリエステルであるバイロナール(登録商標)MD-1220とを樹脂塗液としてそれぞれ準備した。バイロン(登録商標)29CSを用いて作製した中間層としての絶縁層を以降「溶剤型」と称し、バイロナール(登録商標)MD-1220を用いて作成した絶縁層を以降「水分散型」と称す。これら樹脂塗液に、硬化剤として、三井サイテック社製メラミン樹脂であるサイメル(登録商標)303を、樹脂固形分の質量比で、ポリエステル樹脂固形分:メラミン樹脂固形分=100:20となるように添加した。さらに、「溶剤型」の塗液については、ポリエステル樹脂とメラミン樹脂の混合溶液に、三井サイテック社製の酸性触媒であるキャタリストTM600を0.5質量%添加した。「水分散型」の塗液には触媒は添加しなかった。
上述のように形成した中間層としての絶縁層上に鱗片状のAl粒子を吹きかけて、Al金属皮膜を形成した。Al粒子よりなるAl金属層は、めっき層上に、上述のように作製した絶縁層用の塗液をバーコーターで塗布したのち、乾燥前の塗膜上にフルイにてAl粒子を均一に振りかけた後に、熱風乾燥炉で所定の到達板温となる条件で塗膜を乾燥、硬化させることで作製した。本実施例では、Al粒子として昭和アルミパウダー社製のアルミニウムペースト「Sap 561PS」を乾燥させて粒子にしたもの(平均粒径16μm)を用いた。これ以降、本方法を「粒子吹き掛け法」と称す。
Al金属層上に、めっきによるAl金属層を含む皮膜の形成において説明した中間層としての絶縁層用の塗液として調製した樹脂塗液をバーコーターで塗装し、熱風乾燥炉で到達板温230℃となる条件で乾燥、硬化させた後、水冷することで、クリヤー樹脂皮膜層を形成した。
JIS K 5600-5-2「耐カッピング性」に記載の方法で、押し込み深さ8mmの条件でカッピング試験を行った。試験は、評価面がカップ外側となるような条件で行い、試験後加工部にテープを貼り付けて剥離する一般にテープ剥離試験と呼ばれる試験を行った。
作製した亜鉛めっき鋼板を横70mm×縦150mmのサイズに切断し、評価面に鋼板素地まで達するカット傷を設け、四方の切断端面部はテープにてシールすることで、耐食性試験用サンプルを作製した。そして、JIS K 5400の9.1記載の方法で塩水噴霧試験を実施した。塩水は、評価面に噴きかかかるように噴霧した。試験時間は240時間とした。
作製した亜鉛めっき鋼板を横70mm×縦150mmのサイズに切断し、千葉県君津市の沿岸部に6ヶ月間暴露する暴露試験を行い、暴露試験前後の鋼板の色調を分光測色計で測定し、CIE表色系(L*a*b*表色系)の明度を表すL*値を測定した。そして、△L*=[試験前L*]-[試験後L*]としたときに、△L*≦5のものを◎、5<△L*≦10のものを○、10<△L*≦15のものを△、15<△L*≦20のものを×と評価した。
評価面に人差し指を押しつけて指紋を付着させた後に、指紋が全く付着しなかった場合に◎、指紋が付着するが布で拭き取れば指紋が消える場合に○、指紋が付着するが布で拭き取れば指紋が残るものの残った指紋を目視で確認しにくい場合を△、指紋が付着し布でふき取っても全く消えない場合を×と評価した。
(V.外観観察)
評価面を目視にて外観観察し、外観欠陥の有無を評価した。
Claims (19)
- 鋼板と、
前記鋼板の表面に形成されたZn-Al-Mg-Si合金めっき層と、
前記めっき層上に形成された、Alを含む皮膜と、
を含み、
前記Alを含む皮膜中のAlは絶縁物質の存在によって前記めっき層と隔てられていること、
かつ、前記Alを含む皮膜をその表面に垂直な方向から観測して、前記めっき層の当該皮膜中のAlにより隠蔽されている部分の面積の観測視野の全面積に対する比として定義されるAlによる被覆率が75~100%であること、
を特徴とする耐黒変性と耐食性に優れた亜鉛めっき鋼板。 - 前記Alを含む皮膜が鱗片状のAl粒子を含む絶縁物質で構成されており、当該Al粒子は、前記Alを含む皮膜と前記めっき層との界面から少なくとも0.5μmの範囲内に存在しないことを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記Al粒子の平均粒径が5~30μm、アスペクト比が20以上であることを特徴とする、請求項2に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記Alを含む皮膜が、前記めっき層側から順に、絶縁物質で形成された中間層とAl金属層の少なくとも2層で構成されていることを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記Al金属層が鱗片状Al粒子の集合体からなることを特徴とする、請求項4に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記絶縁物質が樹脂であることを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記樹脂がメラミン化合物で架橋されたポリエステル樹脂であることを特徴とする、請求項6に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記ポリエステル樹脂のガラス転移温度Tgが-20~70℃、数平均分子量が15000~25000であることを特徴とする、請求項7に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記Alを含む皮膜の厚みが2~10μmであることを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記Alを含む皮膜の上にクリヤー樹脂皮膜を有することを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記クリヤー樹脂皮膜の厚みが0.2~20μmであることを特徴とする、請求項10に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 前記亜鉛めっき層が0.01~60質量%のAl、0.001~10質量%のMg及び0.001~2質量%のSiを含むことを特徴とする、請求項1に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板。
- 請求項2に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法であって、溶剤中に鱗片状のAl粒子と絶縁物質を含有し、25℃で回転粘度計により測定したせん断速度1s-1の条件での粘度が150~1500mPa・sであり、かつ、25℃で回転粘度計により測定したせん断速度10000s-1での粘度が50~150mPa・sである塗料を鋼板の表面の亜鉛めっき層上に塗布し、次いで前記鋼板を加熱速度5~70℃/sで180~230℃の到達板温まで誘導加熱炉で加熱して、前記Alを含む皮膜を形成することを特徴とする、耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
- 鱗片状Al粒子を水系エマルジョン型ポリエステル樹脂100質量部と架橋剤としてのメラミン化合物10~30質量部とともに溶媒中で混合することにより、前記塗料を調製することを特徴とする、請求項13に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
- 前記塗料の粘度を粘度調整剤を用いて調整することを特徴とする、請求項13に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
- 前記粘度調整剤として、前記水系エマルジョン型ポリエステル樹脂100質量部に対し0.2~10質量部のウレタン変性ポリエーテルを主成分とする界面活性剤を用いることを特徴とする、請求項15に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
- 前記Al粒子として、平均粒径が5~30μm、アスペクト比が20以上のAl粒子を用いることを特徴とする、請求項13に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
- 請求項4に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法であって、
(a)鋼板の表面の亜鉛めっき層の上に絶縁物質の中間層を形成し、次いでその上にめっき法によりAl金属層を形成するか、あるいは、
(b)鋼板の表面の亜鉛めっき層の上に絶縁物質の中間層を形成するための液状材料を塗布し、この液状材料の上に鱗片状Al粒子を吹きかけ、その後前記液状材料を固化させて、絶縁物質の中間層とその上のAl金属層とを形成する、
ことを特徴とする耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。 - 前記めっき法が真空蒸着めっき法であることを特徴とする、請求項18に記載の耐黒変性と耐食性に優れた亜鉛めっき鋼板の製造方法。
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JP2019206179A (ja) * | 2018-05-25 | 2019-12-05 | 日本製鉄株式会社 | 表面処理鋼板 |
JP6658988B1 (ja) * | 2018-05-25 | 2020-03-04 | 日本製鉄株式会社 | 表面処理鋼板 |
KR20200121359A (ko) | 2018-05-25 | 2020-10-23 | 닛폰세이테츠 가부시키가이샤 | 표면 처리 강판 |
KR20200129122A (ko) | 2018-05-25 | 2020-11-17 | 닛폰세이테츠 가부시키가이샤 | 표면 처리 강판 |
JP7243451B2 (ja) | 2018-05-25 | 2023-03-22 | 日本製鉄株式会社 | 表面処理鋼板 |
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MY160462A (en) | 2017-03-15 |
CN105793468A (zh) | 2016-07-20 |
CN105793468B (zh) | 2017-05-31 |
JP5655981B1 (ja) | 2015-01-21 |
AU2013405739A1 (en) | 2016-05-26 |
JPWO2015075792A1 (ja) | 2017-03-16 |
AU2013405739B2 (en) | 2016-08-11 |
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