JP5786650B2 - Painted steel with excellent laser cutting ability, primary rust prevention and visibility - Google Patents
Painted steel with excellent laser cutting ability, primary rust prevention and visibility Download PDFInfo
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- JP5786650B2 JP5786650B2 JP2011238543A JP2011238543A JP5786650B2 JP 5786650 B2 JP5786650 B2 JP 5786650B2 JP 2011238543 A JP2011238543 A JP 2011238543A JP 2011238543 A JP2011238543 A JP 2011238543A JP 5786650 B2 JP5786650 B2 JP 5786650B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 68
- 239000010959 steel Substances 0.000 title claims description 68
- 238000003698 laser cutting Methods 0.000 title claims description 65
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims description 49
- 230000002265 prevention Effects 0.000 title claims description 38
- 239000011248 coating agent Substances 0.000 claims description 104
- 238000000576 coating method Methods 0.000 claims description 104
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 100
- 239000000463 material Substances 0.000 claims description 61
- 239000000843 powder Substances 0.000 claims description 60
- 239000000049 pigment Substances 0.000 claims description 52
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 40
- 150000001875 compounds Chemical class 0.000 claims description 22
- 229910052749 magnesium Inorganic materials 0.000 claims description 18
- 229910052787 antimony Inorganic materials 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 229910052750 molybdenum Inorganic materials 0.000 claims description 17
- 229910052759 nickel Inorganic materials 0.000 claims description 17
- 229910052718 tin Inorganic materials 0.000 claims description 17
- 229910052721 tungsten Inorganic materials 0.000 claims description 17
- 229910052720 vanadium Inorganic materials 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 8
- 239000001034 iron oxide pigment Substances 0.000 claims description 7
- 238000004040 coloring Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 27
- 239000011701 zinc Substances 0.000 description 20
- 238000005520 cutting process Methods 0.000 description 19
- 230000007797 corrosion Effects 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 17
- 239000011777 magnesium Substances 0.000 description 17
- 239000002987 primer (paints) Substances 0.000 description 17
- 239000010949 copper Substances 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 238000011156 evaluation Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- -1 alkyl silicate Chemical compound 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 2
- 229910002544 Fe-Cr Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- LJCFOYOSGPHIOO-UHFFFAOYSA-N antimony pentoxide Chemical compound O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 2
- 229940044175 cobalt sulfate Drugs 0.000 description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910000365 copper sulfate Inorganic materials 0.000 description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 2
- 239000012860 organic pigment Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000013615 primer Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- CMZUMMUJMWNLFH-UHFFFAOYSA-N sodium metavanadate Chemical class [Na+].[O-][V](=O)=O CMZUMMUJMWNLFH-UHFFFAOYSA-N 0.000 description 2
- 235000015393 sodium molybdate Nutrition 0.000 description 2
- 239000011684 sodium molybdate Substances 0.000 description 2
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 2
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 2
- 239000001119 stannous chloride Substances 0.000 description 2
- 235000011150 stannous chloride Nutrition 0.000 description 2
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical compound [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- 239000012463 white pigment Substances 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910003286 Ni-Mn Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical class [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 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
- 239000002518 antifoaming agent Substances 0.000 description 1
- 150000001462 antimony Chemical class 0.000 description 1
- FAPDDOBMIUGHIN-UHFFFAOYSA-K antimony trichloride Chemical compound Cl[Sb](Cl)Cl FAPDDOBMIUGHIN-UHFFFAOYSA-K 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 150000001868 cobalt Chemical class 0.000 description 1
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 229910000159 nickel phosphate Inorganic materials 0.000 description 1
- JOCJYBPHESYFOK-UHFFFAOYSA-K nickel(3+);phosphate Chemical compound [Ni+3].[O-]P([O-])([O-])=O JOCJYBPHESYFOK-UHFFFAOYSA-K 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- IYDGMDWEHDFVQI-UHFFFAOYSA-N phosphoric acid;trioxotungsten Chemical compound O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O IYDGMDWEHDFVQI-UHFFFAOYSA-N 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- RCIVOBGSMSSVTR-UHFFFAOYSA-L stannous sulfate Chemical compound [SnH2+2].[O-]S([O-])(=O)=O RCIVOBGSMSSVTR-UHFFFAOYSA-L 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229910000375 tin(II) sulfate Inorganic materials 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 description 1
- WQEVDHBJGNOKKO-UHFFFAOYSA-K vanadic acid Chemical compound O[V](O)(O)=O WQEVDHBJGNOKKO-UHFFFAOYSA-K 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
本発明は、優れたレーザ切断性および一次防錆性を兼備し、かつ視認性、特に白色塗料で書いた文字の視認性に優れた塗装鋼材に関する。 The present invention relates to a coated steel material having both excellent laser cutting property and primary rust prevention property, and excellent visibility, particularly visibility of characters written with a white paint.
造船、橋梁、建機などのファブリケーターでは、寸法精度が高く(±0.5mm)、部材への熱影響が少なく、さらには無人化レベルの自動化が比較的容易である等の利点から、厚鋼板の切断方法としてレーザ切断の採用が増加している。しかし、レーザ切断には、プラズマ切断と比較すると切断速度が遅い、ガス切断に比べて切断可能板厚が限定されるといった問題点があった。 Fabricators such as shipbuilding, bridges, and construction machinery have high dimensional accuracy (± 0.5mm), less heat effects on components, and are relatively easy to automate unmanned levels. As a cutting method, the use of laser cutting is increasing. However, the laser cutting has a problem that the cutting speed is slow compared to the plasma cutting, and the plate thickness that can be cut is limited compared to the gas cutting.
さらには、ファブリケーターで行われる一次防錆処理としてのプライマーにより、レーザ切断速度と切断できる板厚の上限が低下するという問題がある。このメカニズムについては明確になっておらず、各々のファブリケーターで経験的に得られた手法をもとに対処しているのが現状である。その一つに、ファブリケーターで先行焼と称する前処理があり、切断部の塗膜への低出力レーザの事前照射を実施している。この前処理によりレーザ切断性が向上するが、実切断線に沿って２度のレーザ照射を必要とするため、工程的にも、投入エネルギー的にもロスが大きい。このため、経済的な損失も大きい。したがって、上記先行焼のような２度のレーザ照射を行うことなく、レーザ切断性を向上させる前処理に対する要望は高く、現在までに多くの提案がなされている。 Furthermore, there is a problem that the upper limit of the laser cutting speed and the plate thickness that can be cut is lowered by the primer as the primary rust prevention treatment performed by the fabricator. This mechanism is not clear and is currently being dealt with based on empirically obtained methods for each fabricator. One of them is a pre-treatment called pre-firing by a fabricator, which performs pre-irradiation of a low-power laser onto a coating film at a cutting portion. Although laser cutting performance is improved by this pretreatment, since laser irradiation is required twice along the actual cutting line, there is a large loss both in terms of process and input energy. For this reason, the economic loss is also large. Therefore, there is a high demand for pretreatment that improves laser cutting performance without performing laser irradiation twice as in the preceding firing, and many proposals have been made so far.
例えば、特許文献１には、塗膜（プライマー層）に含まれるZnがレーザ切断性に悪影響を及ぼすことに鑑み、防錆剤として添加されている塗膜中のZn量を制限することで、レーザ切断性の向上を図る技術が提案されている。しかしながら、Znは防錆に効果的な元素であり、Zn量を制限することにより塗膜の防錆性は低下するが、特許文献１には、塗膜中のZn量を制限することによる防錆性の低下を補う方法については記載されていない。 For example, in Patent Document 1, in view of the fact that Zn contained in a coating film (primer layer) adversely affects laser cutting properties, by limiting the amount of Zn in the coating film added as a rust inhibitor, Techniques for improving laser cutting performance have been proposed. However, Zn is an element effective for rust prevention, and the rust prevention property of the coating film is reduced by limiting the amount of Zn. However, Patent Document 1 discloses prevention by limiting the amount of Zn in the coating film. There is no description on how to compensate for the decrease in rust.
一方、塗膜の防錆性を向上させる技術に関し、特許文献２には、耐熱・防食塗料としてZn：65〜85wt%、Al：3〜15wt％の混合粉末による高耐食性塗料を用いることにより、塗膜の防食性（防錆性）・耐熱性を向上させる技術が提案されている。しかしながら、特許文献２で提案された技術では、レーザ切断性について全く考慮されていない。そして、その実施例が示すように、特許文献２で提案された技術では、塗装する際の膜厚を、高耐食性を確保するために75μmという厚い膜厚に設定している。よって、膜厚が多くなることに付随して塗膜に含まれる(Zn+Al)量が多くなるため、レーザ切断性は低いと考えられる。 On the other hand, regarding the technology for improving the rust prevention property of the coating film, Patent Document 2 discloses that by using a high corrosion resistance paint with a mixed powder of Zn: 65 to 85 wt%, Al: 3 to 15 wt% as a heat and anticorrosion paint, Techniques have been proposed for improving the corrosion resistance (rust resistance) and heat resistance of coating films. However, the technique proposed in Patent Document 2 does not consider laser cutting performance at all. And as the example shows, in the technique proposed in Patent Document 2, the film thickness at the time of coating is set to a thick film thickness of 75 μm in order to ensure high corrosion resistance. Therefore, since the amount of (Zn + Al) contained in the coating film increases as the film thickness increases, the laser cutting property is considered to be low.
また、特許文献３には、Zn−Al−Mgの合金粉末による高耐食性塗料を用いることにより、塗装金属板の耐食性を向上させる技術が提案されている。しかしながら、特許文献３で提案された技術では、ZnとAlとMgとを合金粉末化するため、単体のZn粉末、Al粉末を使用する場合と比較して塗料製造コストが上昇する。また、特許文献３で提案された技術においても、レーザ切断性について全く考慮されていない。そして、その実施例が示すように、特許文献３で提案された技術では、塗装する際の膜厚を、高耐食性を確保するために60μmという厚い膜厚に設定している。よって、特許文献２で提案された技術と同様に、塗膜に含まれる(Zn+Al)量が多くなるため、レーザ切断性は低いと考えられる。 Patent Document 3 proposes a technique for improving the corrosion resistance of a coated metal plate by using a highly corrosion-resistant paint made of Zn—Al—Mg alloy powder. However, in the technique proposed in Patent Document 3, since Zn, Al, and Mg are alloyed, alloy manufacturing costs increase compared to the case of using a single Zn powder or Al powder. Further, even in the technique proposed in Patent Document 3, no consideration is given to laser cutting performance. And as the example shows, in the technique proposed in Patent Document 3, the film thickness at the time of coating is set to a thick film thickness of 60 μm in order to ensure high corrosion resistance. Therefore, similarly to the technique proposed in Patent Document 2, the amount of (Zn + Al) contained in the coating film is increased, so that the laser cutting property is considered to be low.
これらの技術に対し、特許文献４には、プライマーに、亜鉛粉末およびアルミニウム粉末に加えてチタニア粉末を含有させる技術が提案されている。そして、特許文献４で提案された技術によると、プライマーに含まれるチタニア粉末および亜鉛粉末およびアルミニウム粉末の含有量を適正化することにより、塗装鋼材のレーザ切断性および一次防錆性が向上するとされている。しかしながら、特許文献４で提案された技術では、白色のチタニア粉末を含むことからプライマー表面が白色化し、鋼材の履歴を明らかにするために一般的に使用されている白色塗料を用いた製造記号の文字が判別し難いという問題があった。 In contrast to these techniques, Patent Document 4 proposes a technique in which a primer contains titania powder in addition to zinc powder and aluminum powder. And according to the technique proposed in Patent Document 4, the laser cutting property and primary rust prevention property of the coated steel material are improved by optimizing the content of titania powder, zinc powder and aluminum powder contained in the primer. ing. However, in the technique proposed in Patent Document 4, since the white titania powder is included, the primer surface is whitened, and the manufacturing symbol using the white paint generally used for clarifying the history of the steel material is used. There was a problem that characters were difficult to distinguish.
以上のように、特許文献１で提案された技術では、塗膜中のZn量の低下に伴う防錆性の低下については何ら対策されておらず、Zn量を制限することで防錆性が著しく低下するおそれがある。また、特許文献２および特許文献３で提案された技術では、レーザ切断性については考慮されておらず、かつ塗膜の厚さから推定できる塗膜に含まれる(Zn+Al)量は多量で、レーザ切断性が劣ると考えられる。 As described above, the technique proposed in Patent Document 1 does not take any measures against the decrease in rust prevention property due to the decrease in the Zn content in the coating film, and the rust prevention performance is limited by limiting the Zn content. There is a risk of significant reduction. In the techniques proposed in Patent Document 2 and Patent Document 3, laser cutting properties are not considered, and the amount of (Zn + Al) contained in the coating film that can be estimated from the thickness of the coating film is large. It is considered that the laser cutting property is inferior.
また、特許文献４で提案された技術では、レーザ切断性および一次防錆性に優れた塗装鋼材が得られるものの、実際の製造工程では、開発鋼材の表面が白色化し、鋼材の履歴を明らかにするために一般的に使用されている白色塗料による製造記号などの文字が判別しにくいという問題があった。また、特許文献４には、着色顔料を添加しても良いとの記述はあるものの、具体的に添加する着色顔料の特徴やその添加量の記載はない。そのため、選択する着色顔料の種類によってはレーザ切断性が低下するという問題が起こった。 In addition, with the technology proposed in Patent Document 4, a coated steel material with excellent laser cutting property and primary rust prevention property can be obtained, but in the actual manufacturing process, the surface of the developed steel material becomes white and the history of the steel material is clarified. Therefore, there is a problem that it is difficult to distinguish characters such as manufacturing symbols using white paint generally used. Moreover, although there is description in Patent Document 4 that a color pigment may be added, there is no description of the characteristics of the color pigment to be specifically added and the addition amount thereof. For this reason, there is a problem that the laser cutting property is lowered depending on the type of the color pigment to be selected.
実際に鋼材を製造または加工する現場では、鋼材の種類や履歴を判別するために白色塗料で鋼材表面に文字や記号を印字されることが一般的に行われており、前記文字や記号の視認性は製造および製作現場で重要な機能の１つである。
本発明はかかる事情に鑑みてなされたものであって、レーザで切断した場合にレーザ切断性が高く、かつ防錆性にも優れ、かつ視認性、特に白色塗料で書いた文字の視認性に優れた塗膜を有する塗装鋼材を提供することを目的とする。
At sites where steel materials are actually manufactured or processed, it is common practice to print letters and symbols on the surface of steel materials with white paint to distinguish the type and history of steel materials. Sexuality is one of the important functions in manufacturing and production sites.
The present invention has been made in view of such circumstances, and when cut with a laser, the laser cutting performance is high, the rust prevention is excellent, and the visibility, particularly the visibility of characters written with a white paint. An object is to provide a coated steel material having an excellent coating film.
上記課題を解決すべく、本発明者らは、特許文献４で提案された技術において、視認性、特に塗装鋼材の表面に記載する鋼材の製造番号等を示す文字の視認性に影響を及ぼす各種要因について鋭意検討した。その結果、鋼材の表面に形成される塗膜表面の視認性を高めるために必要な指標として、マンセル値の明度を採用することに想到した。そして、特許文献４で提案された技術、すなわちチタニア粉末、亜鉛粉末およびアルミニウム粉末を含有する塗膜に、更に塗膜表面のマンセル値の明度を7.0以下とする着色顔料を含有させることにより、視認性が飛躍的に向上することを知見した。 In order to solve the above problems, the inventors of the technology proposed in Patent Document 4 have various effects that affect the visibility, particularly the visibility of characters indicating the serial number of the steel material described on the surface of the coated steel material. The factors were studied earnestly. As a result, the inventors have come up with the idea of adopting the Munsell value as an index necessary for improving the visibility of the coating film surface formed on the surface of the steel material. Further, the technique proposed in Patent Document 4, that is, the coating film containing titania powder, zinc powder and aluminum powder, further contains a coloring pigment having a Munsell value lightness of 7.0 or less on the surface of the coating film. It has been found that the sex is dramatically improved.
また、マンセル値を小さくするためには、塗膜に黒色系顔料を添加すればよいが、通常、塗料の黒色顔料として知られている黒鉛を添加した系では、レーザー切断性が著しく低下してしまうことが判った。さらに、種々の黒色系顔料を検討した結果、ある種のもののみがレーザー切断性を阻害することなく乾燥塗膜表面のマンセル値を7.0以下にできる事を知見した。これらの事項は、通常の塗料および塗膜（またはプライマー）では全く問題になる事ではなく、上記のような（特許文献４で提案されたような）レーザー切断性を向上させるために用いられる塗膜（プライマー）固有の問題である。さらに、塗膜中の着色顔料の含有量を適正化することにより、鋼材のレーザ切断性や１次防錆性を損なわず、白色顔料との視認性（白色塗料で書いた文字の視認性）を向上させることが可能であることを知見した。また、塗膜成分中の添加成分量（チタニア粉末、亜鉛粉末、アルミニウム粉末の合計量）に対する着色成分（着色顔料）の量を規定する所望の式を満足することにより、着色顔料の含有量の適正範囲が得られることを知見した。 Moreover, in order to reduce the Munsell value, a black pigment may be added to the coating film. However, in a system in which graphite, which is generally known as a black pigment for paints, is added, the laser cutting property is significantly reduced. It turned out that. Furthermore, as a result of studying various black pigments, it was found that only certain types can reduce the Munsell value on the surface of the dried coating film to 7.0 or less without inhibiting laser cutting ability. These matters are not a problem at all in ordinary paints and coating films (or primers), but are used to improve the laser cutting property as described above (as proposed in Patent Document 4). This is a problem inherent to the membrane (primer). Furthermore, by optimizing the content of the colored pigment in the coating film, the laser cutting property and primary rust prevention of the steel material are not impaired, and visibility with the white pigment (visibility of characters written with white paint) It was found that it is possible to improve. In addition, by satisfying a desired formula that defines the amount of the color component (color pigment) relative to the amount of the additive component in the coating film component (total amount of titania powder, zinc powder, aluminum powder), the content of the color pigment It was found that an appropriate range can be obtained.
本発明は、上記の知見に基づき完成されたものであり、その要旨は次のとおりである。
[１] 鋼材の表面に、乾燥塗膜として、チタニア粉末および亜鉛粉末およびアルミニウム粉末を含有し、さらに黒色酸化鉄顔料、黒色焼成顔料の１種または２種からなる着色顔料を含有し、前記チタニア粉末の含有量が4.5g/m2以上26g/m2以下、前記亜鉛粉末の含有量が5g/m2以上30g/m2以下、前記アルミニウム粉末の含有量が0.1g/m2以上10g/m2以下であり、前記チタニア粉末の含有量をAg/m2、前記亜鉛粉末の含有量をBg/m2、前記アルミニウム粉末の含有量をCg/m2とし、前記着色顔料の含有量をXg/m2とした場合、下記(1)式で表されるYの値が0.010以上0.200以下であり、かつ、前記乾燥塗膜表面のマンセル値の明度が7.0以下である塗膜を有することを特徴とするレーザ切断性、一次防錆性および視認性に優れた塗装鋼材。
記
Y=X/(A+B+C) ・・・(1)
The present invention has been completed based on the above findings, and the gist thereof is as follows.
[1] on the surface of the steel, as a dry coating, containing titania powder and zinc powder and aluminum powder, further black iron oxide pigments, contain one or two or one Ranaru coloring pigment black fired pigment, wherein The titania powder content is 4.5 g / m 2 or more and 26 g / m 2 or less, the zinc powder content is 5 g / m 2 or more and 30 g / m 2 or less, and the aluminum powder content is 0.1 g / m 2 or more and 10 g. / m 2 or less, the content of the titania powder is Ag / m 2 , the content of the zinc powder is Bg / m 2 , the content of the aluminum powder is Cg / m 2, and the content of the color pigment When Xg / m 2 , the coating film has a value of Y represented by the following formula (1) of 0.010 or more and 0.200 or less, and the Munsell value brightness of the dry coating film surface is 7.0 or less. Painted steel material with excellent laser cutting property, primary rust prevention property and visibility.
Record
Y = X / (A + B + C) (1)
[２] [１]において、前記チタニア粉末の含有量が8.0g/m2以上18g/m2以下、前記亜鉛粉末の含有量が13g/m2以上27g/m2以下、前記アルミニウム粉末の含有量が0.5g/m2以上1.5g/m2以下、前記着色顔料の含有量が1.0g/m2以上5.0g/m2以下であり、前記(1)式で表されるYの値が0.030以上0.200以下であることを特徴とするレーザ切断性、一次防錆性および視認性に優れた塗装鋼材。 [2] In [1], the content of the titania powder is 8.0 g / m 2 or more and 18 g / m 2 or less, the content of the zinc powder is 13 g / m 2 or more and 27 g / m 2 or less, the content of the aluminum powder The amount is 0.5 g / m 2 or more and 1.5 g / m 2 or less, the content of the color pigment is 1.0 g / m 2 or more and 5.0 g / m 2 or less, and the value of Y represented by the formula (1) is Painted steel material with excellent laser cutting property, primary rust prevention property and visibility characterized by 0.030 or more and 0.200 or less.
［３］［１］または［２］において、前記乾燥塗膜が、更にMo、W、Ni、Cu、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素の単体および／またはMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素の化合物を含有し、前記元素の単体および／または前記元素の化合物の合計含有量が元素換算で0.01g/m2以上5g/m2以下であることを特徴とするレーザ切断性、一次防錆性および視認性に優れた塗装鋼材。
[3] In [1] or [2], the dried coating film may further comprise a single element of one or more elements selected from Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb, and And / or a compound of one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb, and a simple substance of the element and / or a compound of the element Painted steel material with excellent laser cutting property, primary rust prevention property and visibility, characterized in that the total content is 0.01 g / m 2 or more and 5 g / m 2 or less in terms of element.
本発明によれば、乾燥塗膜がレーザ吸収性の高いチタニア粉末および亜鉛粉末およびアルミニウム粉末を含有し、かつ乾燥塗膜表面のマンセル値の明度を7.0以下とする着色顔料（黒色酸化鉄顔料、黒色焼成顔料の１種または２種以上からなる着色顔料）を適正量含有することにより、優れたレーザ切断性と防錆性とを兼備し、視認性、特に白色塗料で書いた文字の視認性にも優れた塗装鋼材を得ることができる。 According to the present invention, the dry coating film contains a titania powder, zinc powder, and aluminum powder with high laser absorption, and has a Munsell value lightness of 7.0 or less on the surface of the dry coating film (black iron oxide pigment, By including an appropriate amount of a black pigment (a color pigment composed of one or more of the black baked pigments), it has both excellent laser cutting ability and rust prevention, and visibility, especially the visibility of characters written in white paint In addition, excellent coated steel materials can be obtained.
以下、本発明について具体的に説明する。
本発明の塗装鋼材は、鋼材の表面に、乾燥塗膜として、チタニア粉末および亜鉛粉末およびアルミニウム粉末および黒色酸化鉄顔料、黒色焼成顔料の１種または２種以上からなる着色顔料を含有し、前記チタニア粉末の含有量が4.5g/m2以上26g/m2以下、前記亜鉛粉末の含有量が5g/m2以上30g/m2以下、前記アルミニウム粉末の含有量が0.1g/m2以上10g/m2以下であり、前記チタニア粉末の含有量をAg/m2、前記亜鉛粉末の含有量をBg/m2、前記アルミニウム粉末の含有量をCg/m2とし、前記着色顔料の含有量をXg/m2とした場合、下記(1)式で表されるYの値が0.010以上0.200以下であり、かつ、前記乾燥塗膜表面のマンセル値の明度が7.0以下である塗膜を有することを特徴とする。
記
Y=X/(A+B+C) ・・・ (1)
Hereinafter, the present invention will be specifically described.
The coated steel material of the present invention contains, on the surface of the steel material, a colored pigment composed of one or more of titania powder, zinc powder, aluminum powder, black iron oxide pigment, and black fired pigment as a dry coating film, The titania powder content is 4.5 g / m 2 or more and 26 g / m 2 or less, the zinc powder content is 5 g / m 2 or more and 30 g / m 2 or less, and the aluminum powder content is 0.1 g / m 2 or more and 10 g. / m 2 or less, the content of the titania powder is Ag / m 2 , the content of the zinc powder is Bg / m 2 , the content of the aluminum powder is Cg / m 2, and the content of the color pigment When Xg / m 2 , the coating film has a value of Y represented by the following formula (1) of 0.010 or more and 0.200 or less, and the Munsell value brightness of the dry coating film surface is 7.0 or less. It is characterized by that.
Record
Y = X / (A + B + C) (1)
ここで、「マンセル値の明度」とは、JIS Z 8721(1993)に定められた色の表示方法における色の明るさの度合いを示す指標である。黒〜灰色〜白の系列を表し、理想的な黒をゼロ、理想的な白を10とし、その間を明度知覚の差がほぼ等しくなるように分割して数字として表したものである。 Here, “lightness of Munsell value” is an index indicating the degree of brightness of a color in the color display method defined in JIS Z 8721 (1993). This represents a series of black to gray to white, where the ideal black is zero and the ideal white is 10, and the numbers are divided so that the difference in brightness perception is approximately equal.
一般に、ショットブラストした鋼材の表面に一次防錆処理としてジンク(Zn)リッチプライマーもしくはジンクプライマーが塗布された鋼材をレーザ切断した場合には、切断速度の低下が生じることが知られている。この際のレーザ切断速度低下のメカニズムは必ずしも明確になっているわけではないが、上記の一次防錆処理として行われる塗膜形成（プライマー塗装）により、（１）塗膜（一次防錆処理剤）によるレーザ吸収率の低下、（２）レーザ切断時の加熱による塗膜（一次防錆処理剤）中のバインダー樹脂や亜鉛粉末の分解や蒸発によるレーザ光の散乱・吸収、（３）発生したガスによるアシストガス（酸素）の分圧の低下等がレーザ切断速度低下の要因であると推定されている。 In general, it is known that when a steel material having a zinc (Zn) rich primer or zinc primer applied to the surface of a shot blasted steel material as a primary antirust treatment is laser cut, the cutting speed is reduced. Although the mechanism of the laser cutting speed reduction at this time is not necessarily clear, (1) coating film (primary rust preventive agent) by coating film formation (primer coating) performed as the primary rust prevention treatment. ), (2) Scattering / absorption of laser light due to decomposition and evaporation of the binder resin and zinc powder in the coating (primary antirust treatment agent) by heating during laser cutting, (3) It is presumed that a decrease in the partial pressure of the assist gas (oxygen) due to the gas is a factor in reducing the laser cutting speed.
そこで、本発明では、塗装鋼材の塗膜中にレーザ吸収性の高いチタニア(TiO2)粉末を添加してレーザの吸収率を高めることにより上記した（１）の問題を解決し、レーザ切断性を向上させる。
レーザ切断のプロセス初期においては、レーザ光を切断部に集光することにより、その光エネルギーが吸収されて、切断部の温度が局所的に上昇し溶融する。このとき、レーザ吸収性が高いチタニア粉末が含まれる塗膜で切断部を覆うと、光エネルギーが効率的に塗膜に吸収されるので、レーザ切断効率を上昇させることができる。
Therefore, in the present invention, the above-mentioned problem (1) is solved by adding titania (TiO 2 ) powder having high laser absorptivity to the coating film of the coated steel material to increase the laser absorptivity, and laser cutting performance. To improve.
In the initial stage of the laser cutting process, by condensing the laser beam on the cutting part, the light energy is absorbed, and the temperature of the cutting part rises locally and melts. At this time, if the cut portion is covered with a coating film containing titania powder having high laser absorption, light energy is efficiently absorbed by the coating film, so that the laser cutting efficiency can be increased.
チタニア粉末は、レーザ吸収性および切断溝内から溶融スラグを効率的に排出する効果が極めて高い。そのため、チタニア粉末の添加により、レーザ切断時に発生する溶融スラグの粘性が低下し、切断溝内から溶融スラグが効率的に排出されることにより、切断面の美麗さの向上や切断部裏面に付着するドロスの発生を抑止させることもできる。
また、チタニア粉末は、容易に入手することができるうえ、比較的安価であるため、チタニア粉末を用いる本発明は、安定生産とコスト面でも有利である。
Titania powder is extremely effective in laser absorption and efficient discharge of molten slag from within the cut groove. Therefore, the addition of titania powder reduces the viscosity of the molten slag generated during laser cutting, and the molten slag is efficiently discharged from the cutting groove, thereby improving the beauty of the cut surface and adhering to the back of the cut part. It is also possible to suppress the occurrence of dross.
Moreover, since titania powder can be easily obtained and is relatively inexpensive, the present invention using titania powder is advantageous in terms of stable production and cost.
このような効果を有効に発揮させるために、本発明では、塗装鋼材の塗膜（乾燥塗膜）に含まれるチタニア粉末の含有量を4.5 g/m2以上26g/m2以下の範囲とする。チタニア粉末の含有量が4.5g/m2未満では、レーザ切断性の向上効果が小さい。一方、チタニア粉末の含有量が26g/m2を超えると、均一な塗膜の形成が阻害され、防錆性向上を妨げるおそれがある。よって、チタニア粉末の含有量は、4.5 g/m2以上26g/m2以下とする。好ましくは、8.0g/m2以上18g/m2以下である。 In order to exert such an effect effectively, in the present invention, the content of titania powder contained in the coating film (dried coating film) of the coated steel material is set in the range of 4.5 g / m 2 or more and 26 g / m 2 or less. . When the content of the titania powder is less than 4.5 g / m 2 , the effect of improving the laser cutting property is small. On the other hand, when the content of titania powder exceeds 26 g / m 2 , formation of a uniform coating film is hindered, which may hinder improvement in rust prevention. Therefore, the content of the titania powder is 4.5 g / m 2 or more and 26 g / m 2 or less. Preferably, it is 8.0 g / m 2 or more and 18 g / m 2 or less.
また、亜鉛(Zn)粉末は、一次防錆性の向上に極めて効果的な成分である一方、上記した問題（２）および（３）の原因となる成分でもある。ここで、上記した問題（２）および（３）を解消する目的で、塗膜に含まれる亜鉛粉末の添加量を少なくすると、一次防錆性が低下し、新たな問題を招来する。そこで、本発明では、塗膜の亜鉛粉末含有量を抑制するとともに、一次防錆性の向上効果を有するアルミニウム(Al)粉末を添加する。 In addition, zinc (Zn) powder is a component that is extremely effective for improving the primary rust prevention property, and is also a component that causes the above problems (2) and (3). Here, in order to solve the above problems (2) and (3), if the amount of zinc powder contained in the coating film is decreased, the primary rust prevention property is lowered, and a new problem is caused. Therefore, in the present invention, aluminum (Al) powder having an effect of improving the primary rust prevention property is added while suppressing the zinc powder content of the coating film.
アルミニウム粉末が塗膜に含まれていても、レーザ切断時にこれらが分解・蒸発してレーザ切断性に悪影響を及ぼすことは少ない。そのため、塗膜に亜鉛粉末とともにアルミニウム粉末を添加することにより、上記した（２）および（３）の問題を引き起こさずに一次防錆性を確保する。 Even if the aluminum powder is contained in the coating film, it is unlikely that these will decompose and evaporate during laser cutting and adversely affect laser cutting properties. Therefore, by adding aluminum powder together with zinc powder to the coating film, primary rust prevention is ensured without causing the above problems (2) and (3).
レーザ切断性と防錆性を確保する観点からは、塗膜（乾燥塗膜）に含まれる亜鉛粉末の含有量を5 g/m2以上30g/m2以下とすることが好ましい。亜鉛粉末の含有量が5g/m2未満では、アルミニウム粉末を添加しても塗装鋼材の防錆性が不十分となるおそれがある。一方、亜鉛粉末の含有量が30g/m2を超えると、チタニア粉末を添加してもレーザ切断性が不十分となるおそれがある。したがって、亜鉛粉末の含有量は、5 g/m2以上30g/m2以下とする。好ましくは13g/m2以上27g/m2以下である。 From the viewpoint of ensuring laser cutting properties and rust prevention properties, the content of zinc powder contained in the coating film (dry coating film) is preferably 5 g / m 2 or more and 30 g / m 2 or less. If the zinc powder content is less than 5 g / m 2 , even if aluminum powder is added, the rust prevention property of the coated steel may be insufficient. On the other hand, if the zinc powder content exceeds 30 g / m 2 , the laser cutting property may be insufficient even when titania powder is added. Therefore, the content of zinc powder is set to 5 g / m 2 or more and 30 g / m 2 or less. Preferably, it is 13 g / m 2 or more and 27 g / m 2 or less.
また、アルミニウム粉末は、亜鉛粉末の添加量を低減することに起因した防錆性の低下を抑制する目的で添加されるが、塗膜（乾燥塗膜）に含まれるアルミニウム粉末の含有量が0.1g/m2未満ではその効果が十分に発現しないおそれがある。一方、アルミニウム粉末の含有量が10g/m2を超えると、均一な塗膜の形成が阻害され、かえって防錆性を低下させるおそれがある。このため、アルミニウム粉末の含有量は0.1 g/m2以上10g/m2以下とする。好ましくは0.5g/m2以上1.5g/m2以下である。 Aluminum powder is added for the purpose of suppressing deterioration in rust prevention caused by reducing the addition amount of zinc powder, but the content of aluminum powder contained in the coating film (dry coating film) is 0.1. If it is less than g / m 2 , the effect may not be sufficiently exhibited. On the other hand, when the content of the aluminum powder exceeds 10 g / m 2 , formation of a uniform coating film is hindered, and there is a possibility that the rust prevention property may be lowered. For this reason, the content of the aluminum powder is set to 0.1 g / m 2 or more and 10 g / m 2 or less. Preferably, it is 0.5 g / m 2 or more and 1.5 g / m 2 or less.
以上により、本発明では、レーザ切断性が高く、かつ防錆性にも優れた塗装鋼材が得られる。しかしながら、このままではチタニア粉末の添加に起因して塗膜表面（乾燥塗膜表面）が白色化するため、鋼材の履歴を明らかにするために一般的に使用されている白色塗料を用いた製造記号の文字が判別し難い。ここで、上記のようにして得られた白色化した塗膜を有する塗装鋼材表面の明度を測定したところ、マンセル値の明度で7.5程度であることが確認された。 As described above, in the present invention, a coated steel material having a high laser cutting property and an excellent rust prevention property can be obtained. However, as it is, the coating surface (dried coating surface) is whitened due to the addition of titania powder, so the production symbol using the white paint generally used to clarify the history of steel materials Is difficult to distinguish. Here, when the brightness of the surface of the coated steel material having the whitened coating film obtained as described above was measured, it was confirmed that the brightness of the Munsell value was about 7.5.
そこで、本発明者らは、白色塗料でかかれた文字を目視によって容易に判別できるための鋼材表面のマンセル値について検討したところ、7.0以下にする必要があることを知見した。以上の理由により、本発明では、鋼材に形成される塗膜を、チタニア粉末、亜鉛粉末、アルミニウム粉末に加えて更に、塗膜表面のマンセル値の明度を7.0以下とする着色顔料を含有する塗膜とする。 Therefore, the present inventors have examined the Munsell value on the surface of the steel material so that the characters written with the white paint can be easily discriminated visually, and have found that it is necessary to make it 7.0 or less. For the above reasons, in the present invention, in addition to the titania powder, zinc powder, and aluminum powder, the coating film formed on the steel material is further coated with a coating containing a coloring pigment having a Munsell value brightness of 7.0 or less on the coating film surface. A membrane.
このように、マンセル値の明度を7.0以下にすれば、一般的に用いられているジンク(Zn)リッチプライマーもしくはジンクプライマーによる塗膜と同等の灰色系統の色調を有する塗膜表面（塗装鋼材表面）とすることができ、延いては塗装鋼材表面に白色塗料を用いた製造記号の文字等を付した場合においても、容易に文字を判別することができる。なお、視認性の観点からは、上記マンセル値の明度を6.3以下とすることが好ましく、5.8以下とすることがより好ましい。但し、上記マンセル値の明度が5.0未満になると、塗膜を構成する成分のうち白色であるチタニア粉末の含有量を低減することを余儀なくされ、チタニア粉末の含有量の低減化に伴いレーザ切断性が劣化することが懸念される。したがって、上記マンセル値の明度は5.0以上7.0以下とすることが好ましい。また、5.5以上6.5以下とすることがより好ましい。 In this way, if the Munsell value is set to 7.0 or less, the surface of the paint film having a gray color tone equivalent to that of a paint film using a zinc (Zn) rich primer or zinc primer that is generally used (paint steel surface) In other words, even when a character of a production symbol using a white paint is attached to the surface of the coated steel material, the character can be easily identified. From the viewpoint of visibility, the Munsell value is preferably 6.3 or less, more preferably 5.8 or less. However, when the lightness of the Munsell value is less than 5.0, it is forced to reduce the content of white titania powder among the components constituting the coating film, and laser cutting performance is accompanied by a reduction in the content of titania powder. There is concern about deterioration. Therefore, the lightness of the Munsell value is preferably 5.0 or more and 7.0 or less. Moreover, it is more preferable to set it as 5.5 or more and 6.5 or less.
本発明において乾燥塗膜表面のマンセル値の明度を7.0以下とするために用いられる黒色系着色顔料は、上記したように特定の種類のみに限られる。本発明者らの知見によると、通常、塗料に黒色系顔料として添加されるカーボンブラックや黒鉛や黒色有機顔料など、主成分として炭素を含有する着色顔料を用いると、塗装鋼材のレーザ切断性が低下する傾向にある。これは、主成分として炭素が含有する着色顔料が塗膜に含まれると、レーザ切断時の酸化反応でCOガス／CO2ガスが発生し、切断部分の酸素分圧を低下させて切断能力が低下するためであると推測される。したがって、カーボンブラックや黒鉛や黒色有機顔料などは、本発明で用いる着色顔料には適さず、本発明では黒色酸化鉄顔料や黒色焼成顔料を用いる必要がある。黒色酸化鉄顔料や黒色焼成顔料は複合酸化物顔料と呼ばれることもあり、例えば、Fe３O４系、Fe-Cr系、Fe-Cr-Ni-Mn系、Co-Fe-Cr系やCu-Cr-Mn系など多数知られているが、それらに限られず、炭素および有機物がほとんど含まれていない無機成分主体のものであれば使用することができる。 In the present invention, the black color pigments used to make the Munsell value lightness on the surface of the dried coating film 7.0 or less are limited to specific types as described above. According to the knowledge of the present inventors, when a color pigment containing carbon as a main component, such as carbon black, graphite, or black organic pigment, which is usually added to a paint as a black pigment is used, the laser cutting property of the coated steel material is reduced. It tends to decrease. This is because if the color pigment containing carbon as the main component is included in the coating film, CO gas / CO 2 gas is generated by the oxidation reaction during laser cutting, and the oxygen partial pressure at the cutting part is lowered, so that the cutting ability is reduced. It is presumed to be due to a decrease. Accordingly, carbon black, graphite, black organic pigment, and the like are not suitable for the color pigment used in the present invention, and in the present invention, it is necessary to use a black iron oxide pigment or a black calcined pigment. Black iron oxide pigments and black calcined pigments are sometimes called composite oxide pigments, such as Fe 3 O 4 , Fe—Cr, Fe—Cr—Ni—Mn, Co—Fe—Cr, and Cu— Many Cr-Mn-based materials are known, but are not limited to these, and any inorganic-based material containing almost no carbon and organic substances can be used.
以上のように、本発明では、鋼材に形成される塗膜を、チタニア粉末、亜鉛粉末、アルミニウム粉末に加えて更に、乾燥塗膜表面のマンセル値の明度を7.0以下とする着色顔料を含有する塗膜とすることにより、レーザ切断性、防錆性に優れるとともに、視認性、特に白色塗料で書いた文字の視認性にも優れた塗装鋼材を得ることができる。 As described above, in the present invention, in addition to the titania powder, zinc powder, and aluminum powder, the coating film formed on the steel material further contains a color pigment that sets the lightness of the Munsell value on the surface of the dried coating film to 7.0 or less. By setting it as a coating film, it is possible to obtain a coated steel material which is excellent in laser cutting property and rust prevention property, and also in visibility, particularly in the visibility of characters written with a white paint.
また、着色顔料の添加量は、塗膜（乾燥塗膜）に含まれるチタニア粉末をAg/m2、亜鉛粉末をBg/m2、アルミニウム粉末をCg/m2とし、着色顔料をXg/m2とした場合、(1)式：Y=X/(A+B+C)で表されるYの値が0.010以上0.200以下となるようにする。Yの値、すなわち、塗膜（乾燥塗膜）中に含有される白色系の物質であるチタニア粉末、亜鉛粉末、アルミナ粉末の合計含有量と着色顔料の含有量の比が0.010以上であると、マンセル値の明度が7.0以下となり、視認性が向上する。好ましくは0.030以上である。 The amount of color pigment added is Ag / m 2 for the titania powder, Bg / m 2 for the zinc powder, Cg / m 2 for the aluminum powder, and Xg / m 2 for the color pigment. When 2 , the value of Y represented by the formula (1): Y = X / (A + B + C) is set to be 0.010 or more and 0.200 or less. The value of Y, that is, the ratio of the total content of titania powder, zinc powder and alumina powder, which is a white substance contained in the coating film (dry coating film), and the content of the color pigment is 0.010 or more The brightness of the Munsell value is 7.0 or less, and the visibility is improved. Preferably it is 0.030 or more.
一方、上記Yの値が0.200を超えると、レーザ切断性が低下する場合や、耐食性評価において着色顔料である黒色酸化鉄による赤錆発生が目視で観察される場合がある。なお、これらの原因は定かではないが、塗装鋼材表面でレーザ吸収性が高いチタニアの存在比率が低下するためと推定される。また、上記Yの値が0.200を超えると、耐食性（防錆性）が劣化する場合もある。したがって、上記Yの値を0.200以下とする。好ましくは0.100以下である。 On the other hand, if the value of Y exceeds 0.200, the laser cutting property may be deteriorated, or the occurrence of red rust due to black iron oxide, which is a coloring pigment, may be visually observed in the corrosion resistance evaluation. In addition, although these causes are not certain, it is estimated that the abundance ratio of titania having high laser absorptivity on the surface of the coated steel material is reduced. On the other hand, if the value of Y exceeds 0.200, the corrosion resistance (rust resistance) may deteriorate. Therefore, the value of Y is set to 0.200 or less. Preferably it is 0.100 or less.
また、着色顔料を1.0g/m2以上添加すると鋼板に白色塗料で文字等を記した際の視認性がより一層向上し、一方、5.0g/m2超えで添加すると耐食性やレ−ザ切断性に悪影響を与える場合があるため、塗膜（乾燥塗膜）に含まれる着色顔料の含有量を1.0g/m2以上5.0g/m2以下とし、前記(1)式で表されるYの値を0.030以上0.200以下とすることが好ましい。 Addition of 1.0 g / m 2 or more of colored pigments further improves the visibility when writing white letters on steel sheets, while addition of more than 5.0 g / m 2 adds corrosion resistance and laser cutting. The content of the color pigment contained in the coating film (dried coating film) is 1.0 g / m 2 or more and 5.0 g / m 2 or less, and Y represented by the above formula (1) Is preferably 0.030 or more and 0.200 or less.
また、本発明では、前記乾燥塗膜にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素を所定量含有することが好ましい。前記塗膜中にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbなどの元素を単独または複合で添加することにより、耐食性がより一層向上する。なお、このように耐食性がより一層向上する理由は定かではないが、これらの元素を塗膜中に添加すると、緻密な腐食生成物や安定な複合酸化物が形成される、或いは上記元素が錆中に分散して酸素酸イオンとなって腐食を進行させるClイオンの浸入を抑制する等の理由により、腐食進行の抑制効果が得られるものと推定される。 In the present invention, the dry coating film preferably contains a predetermined amount of one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb. By adding elements such as Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb alone or in combination to the coating film, the corrosion resistance is further improved. The reason why the corrosion resistance is further improved is not clear, but when these elements are added to the coating film, dense corrosion products and stable composite oxides are formed, or the above elements are rusted. It is presumed that the effect of suppressing the corrosion progress can be obtained for the reason of suppressing the intrusion of Cl ions that are dispersed in the oxyacid ions and progress the corrosion.
Mo、W、Ni、Cu、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素は、塗膜中に単体として或いは化合物として含有させることができる。P元素は、化合物として含有させることができる。また、実験の結果、これらの合計含有量が元素換算で0.01g/m2未満になると、上記した効果が十分に発現しない場合がある一方、これらの合計含有量が元素換算で5g/m2を超えると溶接性や切断性などが劣化する場合があることが判明した。したがって、Mo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素は、元素換算で0.01g/m2以上5g/m2以下とすることが好ましい。また、0.1g/m2以上4g/m2以下とすることがより好ましい。 One or more elements of Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb can be contained as a single substance or as a compound in the coating film. P element can be contained as a compound. In addition, as a result of the experiment, when the total content is less than 0.01 g / m 2 in terms of element, the above-described effect may not be sufficiently exhibited, while the total content is 5 g / m 2 in terms of element. It has been found that the weldability and cutability may be deteriorated when exceeding. Therefore, one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb are 0.01 g / m 2 or more and 5 g / m 2 or less in terms of element. It is preferable. Further, it is more preferably 0.1 g / m 2 or more and 4 g / m 2 or less.
また、特に好適な例としては、塗膜が、アルキルシリケート系の樹脂をバインダーとしたものである。
このようにして、レーザ切断性の低下抑制効果が極めて高く、かつ一次防錆性も極めて良好に保つことができ、さらに、白色塗料で書いた文字の視認性も向上できる。
Further, as a particularly preferable example, the coating film uses an alkyl silicate resin as a binder.
In this way, the effect of suppressing the decrease in laser cutting property is extremely high, the primary rust prevention property can be kept very good, and the visibility of characters written with white paint can be improved.
以上のように、レーザ吸収性が高いチタニア粉末を含む本発明の塗膜は、亜鉛粉末の塗膜や亜鉛粉末にアルミニウム粉末が添加された従来の塗膜とは、レーザ切断のプロセスにおいてレーザ光の光エネルギーを効率的に吸収し、溶融スラグの排出を容易にするという機能が付加されている点において、本質的に異なる塗膜である。本発明では、レーザ吸収性が高いチタニア粉末を塗膜に含有させているので、塗膜がレーザ切断性に悪影響を及ぼす亜鉛粉末を含有する場合であってもその含有量が所定量に低減されていれば、レーザ切断の初期においてチタニア粉末によってレーザ光の光エネルギーを効率的に吸収することができ、優れたレーザ切断性を有する塗装鋼材が得られる。 As described above, the coating film of the present invention containing titania powder having high laser absorption is different from the coating film of zinc powder and the conventional coating film in which aluminum powder is added to zinc powder in the laser cutting process. The coating film is essentially different in that it has the function of efficiently absorbing the light energy and facilitating the discharge of molten slag. In the present invention, since the titania powder having high laser absorption is contained in the coating film, even if the coating film contains zinc powder that adversely affects laser cutting properties, the content is reduced to a predetermined amount. If so, the light energy of the laser light can be efficiently absorbed by the titania powder at the initial stage of laser cutting, and a coated steel material having excellent laser cutting properties can be obtained.
また、アルミニウム粉末やMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbは、特にレーザ切断性に悪影響を及ぼすことなく耐食性を高める効果を有する。したがって、塗膜中に、上記チタニア粉末および亜鉛粉末に加えてアルミニウム粉末、或いは更にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素を添加することで、亜鉛粉末含有量の低減に伴う耐食性の劣化が抑制されるとともにレーザ切断性に優れる特性は維持される。
以上の理由により、本発明では、鋼材本体の表面に、チタニア粉末および亜鉛粉末およびアルミニウム粉末、或いは更にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうち１種または２種以上の元素を単体としてまたは化合物として含有する塗膜（プライマー）を設けるのである。
In addition, aluminum powder, Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb have an effect of improving corrosion resistance without adversely affecting laser cutting properties. Accordingly, in the coating film, in addition to the titania powder and zinc powder, an aluminum powder, or one or more of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb. By adding the element, the deterioration of the corrosion resistance accompanying the reduction of the zinc powder content is suppressed, and the characteristics excellent in laser cutting property are maintained.
For the reasons described above, in the present invention, the surface of the steel material body has one or more of titania powder and zinc powder and aluminum powder, or Mo, W, Ni, Cu, P, Mg, V, Co, Sn and Sb. A coating film (primer) containing two or more elements as a simple substance or as a compound is provided.
更に、着色顔料添加においても如何なる種類の着色顔料でも良いというものではなく、白色顔料との視認性を確保するためにマンセル値の明度を7.0以下とする着色顔料であり、炭素を主成分としない黒色酸化鉄顔料、黒色焼成顔料からなる着色顔料であることを特徴としており、従来の技術とは異なり、かつ従来の技術からでは推測できなかった塗膜であるといえる。 In addition, any kind of color pigment may be used in addition of the color pigment, and it is a color pigment having a Munsell value of 7.0 or less to ensure visibility with a white pigment, and does not contain carbon as a main component. It is characterized by being a colored pigment composed of black iron oxide pigment and black calcined pigment, which is different from the conventional technique and can be said to be a coating film that could not be estimated from the conventional technique.
チタニア粉末、亜鉛粉末、アルミニウム粉末としては、アトマイズ法や機械的粉砕法などによって加工されたものを用いることができ、平均粒径が15μm以下に制御されたものが望ましい。これら粉末は、必要に応じて、塗料中での分散性を高めるためのAl、Zr、ポリオールなどによる表面処理をしてもよい。これら粉末とバインダー樹脂以外の塗料添加剤としては、分散剤、湿潤剤、消泡剤、沈殿防止剤、増粘剤などを必要に応じて適宜添加してもよい。 As the titania powder, zinc powder, and aluminum powder, those processed by an atomizing method or a mechanical pulverization method can be used, and those having an average particle size controlled to 15 μm or less are desirable. These powders may be subjected to a surface treatment with Al, Zr, polyol or the like for enhancing the dispersibility in the paint, if necessary. As paint additives other than these powder and binder resin, a dispersant, a wetting agent, an antifoaming agent, a suspending agent, a thickening agent, and the like may be appropriately added as necessary.
Mo、W、Ni、Cu、Mg、V、Co、Sn、Sbの単体としては、各金属粉末を用いることができる。また、Mo、W、Ni、Cu、P、Mg、V、Co、Sn、Sb、の化合物としては、水溶液中で各元素のイオンまたは各元素の酸素酸イオンとなる化合物が適しており、例えば、モリブデン酸、モリブデン酸ナトリウムなどのモリブデン酸塩、リンモリブデン酸、リンモリブデン酸ナトリウムなどのリンモリブデン酸塩、タングステン酸、タングステン酸ナトリウムなどのタングステン酸塩、リンタングステン酸、リンタングステン酸ナトリウムなどのリンタングステン酸塩、硫酸ニッケル、リン酸ニッケルなどのニッケル塩、硫酸銅などの銅塩、リン酸、リン酸カルシウムなどのリン酸塩、硝酸マグネシウム、硫酸マグネシウムなどのマグネシウム塩、バナジン酸ナトリウムなどのバナジン酸塩、硝酸コバルト、硫酸コバルトなどのコバルト塩、酸化第一すず、酸化第二すず、塩化第一すず、硫酸第一すずなどのすず塩、三酸化アンチモン、五酸化アンチモン、塩化アンチモンなどのアンチモン塩等を用いることができる。
また、本発明の塗装鋼材の下地の鋼材は、特に限定されるものではないが、板厚25mm程度までの鋼板に一般的に用いられる。
As the simple substance of Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb, each metal powder can be used. Further, as the compound of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, Sb, a compound that becomes an ion of each element or an oxyacid ion of each element in an aqueous solution is suitable. , Molybdate such as molybdate, sodium molybdate, phosphomolybdate such as phosphomolybdate, sodium phosphomolybdate, tungstate such as tungstic acid, sodium tungstate, phosphotungstic acid, sodium phosphotungstate, etc. Nickel salts such as phosphotungstate, nickel sulfate and nickel phosphate, copper salts such as copper sulfate, phosphates such as phosphoric acid and calcium phosphate, magnesium salts such as magnesium nitrate and magnesium sulfate, vanadic acid such as sodium vanadate Salts, cobalt salts such as cobalt nitrate and cobalt sulfate, stannous oxide, Stannic reduction, stannous chloride, tin salts such as stannous sulfate, antimony trioxide can be used antimony pentoxide, antimony salts such as antimony chloride.
Further, the base steel material of the coated steel material of the present invention is not particularly limited, but is generally used for steel plates having a thickness of up to about 25 mm.
上述のような塗装鋼材に用いられる塗料の調合方法およびこの塗料の鋼材への塗装方法の例を以下に説明する。
まず、JIS K 5552に定める塗料液中に、チタニア粉末および亜鉛粉末およびアルミニウム粉末を投入し、さらに、所定の着色顔料を投入して、シェーカーマシンなどにより十分に混合・撹拝し、塗料を調合する。なお、Mo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素を単体として或いは化合物として含有させる場合には、チタニア粉末、亜鉛粉末、アルミニウム粉末とともにこれらの元素の単体或いは化合物を粉末状にして塗料液中に投入する。次に、調合した塗料を、例えばエアスプレー式塗装装置により、鋼板に、乾燥後の塗膜中のチタニア粉末、亜鉛粉末、アルミニウム粉末および着色顔料の各々の含有量が所望の含有量となるように、或いは更にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の合計含有量が元素換算で所望の含有量となるように、スプレーの吐出量とスプレー速度を調整してスプレーすることにより、塗装鋼材が得られる。
An example of a method for preparing a paint used for the above-described coated steel material and a method for coating the steel material with the paint will be described below.
First, put titania powder, zinc powder, and aluminum powder into the paint liquid specified in JIS K 5552, and then add the specified color pigments, mix and stir thoroughly with a shaker machine, etc. to prepare the paint. To do. In addition, when one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb are contained as a simple substance or as a compound, titania powder, zinc powder, A simple substance or a compound of these elements together with the aluminum powder is powdered and introduced into the coating liquid. Next, the prepared paint is applied to the steel sheet by, for example, an air spray type coating device so that each content of titania powder, zinc powder, aluminum powder and color pigment in the coating film after drying becomes a desired content. Or further spray so that the total content of one or more of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb is the desired content in terms of elements. The coated steel material can be obtained by spraying after adjusting the discharge amount and the spray speed.
なお、鋼板への塗装に際しては、実際に塗装する環境、例えば室温に応じてシンナーにより塗料の粘度を調整して使用することが考えられる。シンナーにより塗料の粘度を調整する場合にも、乾燥後の塗膜中のチタニア粉末、亜鉛粉末、アルミニウム粉末および着色顔料の各々の含有量が所望の含有量になるように、或いは更にMo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の合計含有量が元素換算で所望の含有量となるように、塗料組成を調整し、所望の塗膜を形成することができる。 It should be noted that when painting on a steel sheet, it is conceivable to use the paint with a viscosity adjusted by a thinner according to the actual painting environment, for example, room temperature. Even when the viscosity of the paint is adjusted by the thinner, each content of titania powder, zinc powder, aluminum powder and color pigment in the coating after drying becomes a desired content, or further Mo, W The coating composition is adjusted so that the total content of one or more of Ni, Cu, P, Mg, V, Co, Sn, and Sb is the desired content in terms of element, A coating film can be formed.
JIS K 5552(2002)ジンクリッチプライマーに相当する市販のジンクリッチプライマー（アルキルシリケート系のバインダー樹脂とシンナーからなる塗料液とZn粉末とからなる）を使用し、アルキルシリケート系のバインダー樹脂とシンナーからなる塗料液にチタニア粉末、亜鉛粉末、アルミニウム粉末を添加して混合し、さらに着色顔料を添加、分散して塗膜用塗料を調合して、鋼材表面にスプレー塗装した。上記塗膜用塗料を調合するに際しては、塗膜形成後、乾燥塗膜中のチタニア粉末含有量、亜鉛粉末含有量、アルミニウム粉末含有量および着色顔料含有量が表１に示す値となるように調合した。
下地の鋼材としては、溶接構造用圧延鋼材のSM490A級であり、200mm×100mm×厚さ12mmの寸法を有し、表面にショットブラスト処理を施したものを用いた。
Using a commercially available zinc rich primer equivalent to JIS K 5552 (2002) zinc rich primer (consisting of a coating liquid consisting of alkyl silicate binder resin and thinner and Zn powder), and using alkyl silicate binder resin and thinner A titania powder, a zinc powder, and an aluminum powder were added to and mixed with the resulting coating liquid, and further a color pigment was added and dispersed to prepare a paint for a coating film, which was spray-coated on the steel surface. When preparing the coating material for coating film, after forming the coating film, the titania powder content, zinc powder content, aluminum powder content and color pigment content in the dried coating film should be the values shown in Table 1. Prepared.
As the base steel material, a rolled steel material for welded structure, SM490A class, having a size of 200 mm × 100 mm × thickness 12 mm and a surface subjected to shot blasting was used.
また、上記と同一の市販のジンクリッチプライマーを使用し、アルキルシリケート系のバインダー樹脂とシンナーからなる塗料液にチタニア粉末、亜鉛粉末、アルミニウム粉末を添加するとともに、Mo、W、Ni、Cu、P、Mg、V、Co、Sn、Sbのうちの１種または２種以上の元素の化合物を粉末状にしたのち添加して混合し、さらに着色顔料を添加、分散して塗膜用塗料を調合して、鋼材表面にスプレー塗装した。Mo化合物としてはモリブデン酸ナトリウム、W化合物としてはタングステン酸ナトリウム、Ni化合物としては硫酸ニッケル、Cu化合物としては硫酸銅、P化合物としてはリン酸カルシウム、Mg化合物としては硫酸マグネシウム、V化合物としてはバナジン酸ナトリウム、Co化合物としては硫酸コバルト、Sn化合物としては塩化第一すず、Sb化合物としては三酸化アンチモンを用いた。
上記塗膜用塗料を調合するに際しては、塗膜形成後、乾燥塗膜中のチタニア粉末含有量、亜鉛粉末含有量、アルミニウム粉末含有量、上記化合物の合計含有量（元素換算）、上記着色顔料含有量が表２に示す値となるように調合した。
下地の鋼材としては、溶接構造用圧延鋼材のSM490A級であり、200mm×100mm×厚さ12mmの寸法を有し、表面にショットブラスト処理を施したものを用いた。
Also, using the same commercially available zinc rich primer as above, titania powder, zinc powder and aluminum powder are added to the coating liquid consisting of alkyl silicate binder resin and thinner, and Mo, W, Ni, Cu, P , Mg, V, Co, Sn, Sb, one or two or more elements compounded into powder form, added and mixed, and then added and dispersed color pigment to prepare paint for coating Then, it spray-coated on the steel material surface. Mo compound as sodium molybdate, W compound as sodium tungstate, Ni compound as nickel sulfate, Cu compound as copper sulfate, P compound as calcium phosphate, Mg compound as magnesium sulfate, V compound as sodium vanadate Cobalt sulfate was used as the Co compound, stannous chloride was used as the Sn compound, and antimony trioxide was used as the Sb compound.
When preparing the coating material for coating film, after forming the coating film, the titania powder content, the zinc powder content, the aluminum powder content in the dry coating film, the total content (element conversion) of the above compounds, the above color pigment It mixed so that content might become the value shown in Table 2.
As the base steel material, a rolled steel material for welded structure, SM490A class, having a size of 200 mm × 100 mm × thickness 12 mm and a surface subjected to shot blasting was used.
このようにして得られた塗装鋼材について、以下の手法にしたがいレーザ切断性、防錆性、視認性の評価を行った。
＜レーザ切断性＞
得られた各種の塗装鋼材について、レーザ切断により切断性試験を行った。レーザ切断は、三菱電機株式会社製炭酸ガスレーザ装置を用いて、出力2.1kWでアシストガスとして酸素を0.1MPaにて噴射し、レーザ切断速度1000mm／minで切断したときのレーザ切断面性状を目視で観察した。評価基準は以下のとおりである。
◎：最も良好な切断面であり、ドロスの発生が皆無または極微量で、
切断面が整っている状態。
○：ほぼ良好な切断面であり、一部でドロスが発生したが、切断面が
整っている状態。
△：切断線の総延長の50％以上にドロスが発生したが、完全に切断で
きていた状態。
×：切断線のほぼ全面にドロスが発生し、一部が切断不能であった状
態。
なお、ドロスとは、切断時にレーザ照射面と反対側の表面の切断線に沿って発生するガスを内包した溶融金属が冷えて固化した付着物のことである。
The coated steel materials thus obtained were evaluated for laser cutting properties, rust prevention properties, and visibility according to the following methods.
<Laser cutting ability>
The various coated steel materials obtained were subjected to a cutting test by laser cutting. Laser cutting uses a carbon dioxide laser device manufactured by Mitsubishi Electric Co., Ltd., visually injects oxygen at 0.1 MPa as an assist gas with an output of 2.1 kW, and visually checks the laser cutting surface properties when cutting at a laser cutting speed of 1000 mm / min. Observed. The evaluation criteria are as follows.
◎: The best cut surface with no or very little dross,
The cut surface is in place.
○: Almost good cut surface, some dross occurred, but the cut surface
Well-equipped.
△: Dross occurred in 50% or more of the total length of the cutting line, but it was completely cut
The state that was coming.
X: A state in which dross was generated on almost the entire cutting line and a part of the cutting line was not cut
state.
The dross refers to an adherent formed by cooling and solidifying molten metal containing a gas generated along a cutting line on the surface opposite to the laser irradiation surface at the time of cutting.
＜防錆性＞
防錆性は、JIS K 5552(2002)ジンクリッチプライマーに準拠して塩水噴霧試験で評価した。得られた各種の塗装鋼材について、JIS K 5552(2002)に定める塩水噴霧試験により赤錆が発生するまでの日数を測定した。評価基準は以下のとおりである。
◎◎：赤錆が発生するまでの日数が50日以上（極めて優秀）。
◎：赤錆が発生するまでの日数が30日以上（優秀）。
○：赤錆が発生するまでの日数が18日以上30日未満（良好）。
×：赤錆が発生するまでの日数が18日未満（不良）。
<Rust prevention>
Rust prevention was evaluated by a salt spray test according to JIS K 5552 (2002) zinc rich primer. About the obtained various coated steel materials, the number of days until red rust was generated was measured by a salt spray test defined in JIS K 5552 (2002). The evaluation criteria are as follows.
◎◎: The number of days until red rust occurs is 50 days or more (extremely excellent).
A: The number of days until red rust occurs is 30 days or more (excellent).
○: The number of days until red rust occurs is 18 days or more and less than 30 days (good).
X: Less than 18 days (defect) until red rust occurs.
＜視認性＞
得られた各種の塗装鋼材に、8cm×10cmの大きさで「８」および「３」という文字を白色塗料で書き、その面の照度が300ルクスになるようにして、視力1.2の人間が10m離れた場所、6m離れた場所および2m離れた場所から観察し、文字の読み易さを評価した。評価基準は以下のとおりである。
◎：10m離れた場所から文字が区別して読める場合。
○：10m離れた場所から文字を区別して読むことが困難であるが、6m
離れた場所から文字を区別して読める場合。
×：2m離れた場所まで近寄らないと文字を区別して読めない場合。
<Visibility>
Write the letters “8” and “3” in 8cm × 10cm in white paint on the various coated steel materials obtained so that the illuminance on the surface is 300 lux. Observations were taken from a remote place, 6m away, and 2m away to evaluate the readability of the characters. The evaluation criteria are as follows.
◎: When characters can be read from 10m away.
○: It is difficult to distinguish and read characters from a place 10m away, but 6m
When you can distinguish and read characters from a distant place.
×: When you cannot distinguish and read the characters unless you get close to 2m away.
また、上記レーザ切断性評価、防錆性評価、視認性評価の３つの特性評価が何れも「◎」または「◎◎」であるものを総合評価「◎」とし、上記３つの特性評価が「◎」または「○」であるものを総合評価「○」とし、上記３つの特性評価のうち１つでも「×」であるものを総合評価「×」とした。
これらの評価結果を、表１および表２に示す。
In addition, when the above three characteristics evaluations of the laser cutting property evaluation, the rust prevention evaluation, and the visibility evaluation are all “◎” or “◎◎”, the overall evaluation is “◎”. An evaluation of “◎” or “◯” was assigned as a comprehensive evaluation “◯”, and one of the above three characteristic evaluations was “×” as an overall evaluation “X”.
These evaluation results are shown in Tables 1 and 2.
本発明例である塗装鋼材No.1〜4、9〜14、17、18、23〜38は、本発明に従って鋼板表面に塗膜を形成したものであるが、これらは白色塗料で書いた文字の視認性にも優れ、レーザ切断面性状は◎か○であり、塩水噴霧赤錆発生日数は20日以上であった。 The coated steel materials No. 1 to 4, 9 to 14, 17, 18, and 23 to 38, which are examples of the present invention, are those in which a coating film is formed on the surface of the steel plate according to the present invention. In addition, the laser cut surface properties were ◎ or 、, and the salt spray red rust generation days were 20 days or more.
これに対して、比較例である塗装鋼材No.5〜8、15、16、19〜22は本発明の範囲から外れるものであり、視認性、レーザ切断性、もしくは耐食性のいずれかが、不十分なものであった。 On the other hand, the coated steel materials No. 5 to 8, 15, 16, and 19 to 22, which are comparative examples, are out of the scope of the present invention, and any of visibility, laser cutting property, or corrosion resistance is inferior. It was enough.
本発明のレーザ切断性と一次防錆性に優れ、かつ白色塗料で書いた文字の視認性に優れた塗装鋼材は、造船、橋梁、建築等に使用される鋼板に広く適用することができる。 The coated steel material having excellent laser cutting property and primary rust prevention property and excellent visibility of characters written with white paint can be widely applied to steel plates used in shipbuilding, bridges, construction, and the like.
Claims (3)
記
Y=X/(A+B+C) ・・・(1) On the surface of the steel material, as a dry coating, containing titania powder and zinc powder and aluminum powder, further black iron oxide pigments, contain one or two or one Ranaru coloring pigment black firing pigment, of the titania powder The content is 4.5 g / m 2 to 26 g / m 2 , the zinc powder content is 5 g / m 2 to 30 g / m 2 , and the aluminum powder content is 0.1 g / m 2 to 10 g / m 2 The content of the titania powder is Ag / m 2 , the content of the zinc powder is Bg / m 2 , the content of the aluminum powder is Cg / m 2, and the content of the color pigment is Xg / m 2. When m 2 is characterized by having a coating film in which the value of Y represented by the following formula (1) is 0.010 or more and 0.200 or less, and the Munsell value brightness of the dry coating film surface is 7.0 or less Painted steel material with excellent laser cutting ability, primary rust prevention and visibility.
Record
Y = X / (A + B + C) (1)
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| IN765KON2014 IN2014KN00765A (en) | 2011-10-31 | 2012-06-01 | |
| PCT/JP2012/064731 WO2013065349A1 (en) | 2011-10-31 | 2012-06-01 | Coated steel material with excellent laser cuttability, primary rust prevention performance, and legibility |
| KR1020147011943A KR101568775B1 (en) | 2011-10-31 | 2012-06-01 | Painted steel excellent in terms of laser cutting performance, primary rust prevention performance and legibility |
| CN201280053087.8A CN104023972B (en) | 2011-10-31 | 2012-06-01 | The coated steel of laser cutting, elementary rust-preventing characteristic and identification excellence |
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| JPWO2018062527A1 (en) * | 2016-09-29 | 2019-06-24 | Ｊｘ金属株式会社 | Surface-treated metal powder for laser sintering |
| WO2020008753A1 (en) | 2018-07-02 | 2020-01-09 | 日本電信電話株式会社 | Coating material |
| JP2021167379A (en) * | 2020-04-10 | 2021-10-21 | 長瀬産業株式会社 | Coating material, and coated steel material |
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| JP2007230114A (en) * | 2006-03-02 | 2007-09-13 | Nippon Steel & Sumikin Coated Sheet Corp | Coated metal sheet |
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