JP3668147B2 - Stainless steel plate with excellent coating film adhesion, coated stainless steel plate, and production method thereof - Google Patents
Stainless steel plate with excellent coating film adhesion, coated stainless steel plate, and production method thereof Download PDFInfo
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- JP3668147B2 JP3668147B2 JP2001074201A JP2001074201A JP3668147B2 JP 3668147 B2 JP3668147 B2 JP 3668147B2 JP 2001074201 A JP2001074201 A JP 2001074201A JP 2001074201 A JP2001074201 A JP 2001074201A JP 3668147 B2 JP3668147 B2 JP 3668147B2
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- stainless steel
- steel plate
- compounds
- alkali metal
- steel sheet
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- 229910001220 stainless steel Inorganic materials 0.000 title claims description 52
- 239000010935 stainless steel Substances 0.000 title claims description 52
- 239000011248 coating agent Substances 0.000 title claims description 33
- 238000000576 coating method Methods 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000005868 electrolysis reaction Methods 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 150000001463 antimony compounds Chemical class 0.000 claims description 6
- 150000001495 arsenic compounds Chemical class 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 150000003606 tin compounds Chemical class 0.000 claims description 6
- 150000003752 zinc compounds Chemical class 0.000 claims description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical class [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 5
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 5
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 5
- 229910000318 alkali metal phosphate Inorganic materials 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229940093920 gynecological arsenic compound Drugs 0.000 claims description 5
- 150000004760 silicates Chemical class 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 3
- 229940058905 antimony compound for treatment of leishmaniasis and trypanosomiasis Drugs 0.000 claims description 3
- 229910052785 arsenic Inorganic materials 0.000 claims description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052740 iodine Inorganic materials 0.000 claims description 3
- 239000011630 iodine Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 235000013675 iodine Nutrition 0.000 claims 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- 239000000243 solution Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 239000003973 paint Substances 0.000 description 9
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 9
- 239000007769 metal material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 5
- 239000004115 Sodium Silicate Substances 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- 238000004381 surface treatment Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 235000019795 sodium metasilicate Nutrition 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 235000009518 sodium iodide Nutrition 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- DAMJCWMGELCIMI-UHFFFAOYSA-N benzyl n-(2-oxopyrrolidin-3-yl)carbamate Chemical compound C=1C=CC=CC=1COC(=O)NC1CCNC1=O DAMJCWMGELCIMI-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- 150000004694 iodide salts Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 2
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- 208000034656 Contusions Diseases 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 1
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 1
- FMRLDPWIRHBCCC-UHFFFAOYSA-L Zinc carbonate Chemical compound [Zn+2].[O-]C([O-])=O FMRLDPWIRHBCCC-UHFFFAOYSA-L 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- VMPVEPPRYRXYNP-UHFFFAOYSA-I antimony(5+);pentachloride Chemical compound Cl[Sb](Cl)(Cl)(Cl)Cl VMPVEPPRYRXYNP-UHFFFAOYSA-I 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- COHDHYZHOPQOFD-UHFFFAOYSA-N arsenic pentoxide Chemical compound O=[As](=O)O[As](=O)=O COHDHYZHOPQOFD-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 229910000160 potassium phosphate Inorganic materials 0.000 description 1
- 235000011009 potassium phosphates Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001119 stannous chloride Substances 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- POWFTOSLLWLEBN-UHFFFAOYSA-N tetrasodium;silicate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-] POWFTOSLLWLEBN-UHFFFAOYSA-N 0.000 description 1
- FAKFSJNVVCGEEI-UHFFFAOYSA-J tin(4+);disulfate Chemical compound [Sn+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O FAKFSJNVVCGEEI-UHFFFAOYSA-J 0.000 description 1
- YUOWTJMRMWQJDA-UHFFFAOYSA-J tin(iv) fluoride Chemical compound [F-].[F-].[F-].[F-].[Sn+4] YUOWTJMRMWQJDA-UHFFFAOYSA-J 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Chemical Treatment Of Metals (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、塗膜密着性に優れたステンレス鋼板、これを塗装してなる塗装ステンレス鋼板、及びこれらの製造方法に関する。さらに詳細には、ステンレス鋼板表面を陰極とし、アルカリ溶液中において陰極電解処理を施して得られるステンレス鋼板及びこれを塗装してなる塗装ステンレス鋼板及びこれらの製造方法に関する。
【０００２】
【従来の技術】
近年、金属材料はニーズの多様化や高度化に伴い、カラー化による意匠性向上、或いは耐食性や潤滑性など、高機能が付加されたものが要求される場合が多くなってきている。
金属材料の塗装において重要な技術的課題は塗膜の密着性であり、これが不十分であるとフクレが生じ、最終的には発銹の原因となる。また、それがプレコート鋼板の場合には成形加工される過程において塗膜剥離による外観劣化や剥離した塗膜紛による金型押し疵が発生する。
【０００３】
金属材料と塗膜との密着性を向上させるには、金属材料表面にクロメート処理を施し密着性の良好な皮膜を成形する方法、或いは、サンド・ブラスト処理を施すなどして機械的な凹凸を生じせしめる方法が一般的に行われている。しかしながら、前者はクロム酸の廃液処理の問題があり、さらには、金属材料と塗膜の界面に有害重金属である六価クロムが存在するため、近年の環境問題から敬遠される傾向にある。また、後者は粉塵の環境問題もさることながら、ブラスト用サンドの管理が難しく、一定の肌に保持するのが非常に困難であった。さらに、表面にサンドが付着したまま塗装を施すと密着性に悪影響を及ぼすため、処理後の洗浄にはシビアな管理を必要としていた。
【０００４】
【発明が解決しようとする課題】
本発明の第１の目的は、塗膜密着性に優れたステンレス鋼板を提供することである。
本発明の第２の目的は、塗膜密着性に優れた塗装ステンレス鋼板を提供することである。
本発明の第３の目的は、環境上の問題を起すことなく、塗膜密着性に優れたステンレス鋼板を製造する方法を提供することである。
本発明の第４の目的は、生産性良く、塗膜密着性に優れた塗装ステンレス鋼板を製造する方法を提供することである。
【０００５】
【課題を解決するための手段】
本発明は、アルカリ水溶液中で陰極電解処理してなる塗膜密着性に優れたステンレス鋼板、及び該ステンレス鋼板から製造された物品を提供するものである。本発明はさらに、ステンレス鋼板をアルカリ水溶液中で陰極電解処理することを特徴とする塗膜密着性に優れたステンレス鋼板の製造方法、及び得られたステンレス鋼板を塗装することを特徴とする塗装ステンレス鋼板の製造方法を提供するものである。
【０００６】
【発明の実施の形態】
以下、本発明を詳細に説明する。
本発明において表面処理されるステンレス鋼板としては、マルテンサイト系、フェライト系及びオーステナイト系等の全てのステンレス鋼板が挙げられる。一般に本発明の表面処理がなされるステンレス鋼板は、予め表面仕上げがなされているが、その表面仕上げとしては、光輝焼鈍仕上げ、酸洗仕上げ、ハード仕上げ及び研磨仕上げ等が挙げられる。
【０００７】
本発明において使用するアルカリ水溶液（表面処理液）は、アルカリ金属水酸化物、アルカリ金属炭酸塩及びアルカリ金属燐酸塩からなる群から選ばれた少なくとも１種のアルカリ成分と、アンチモン化合物、亜鉛化合物、錫化合物、砒素化合物、珪酸塩及びヨウ化物からなる群から選ばれた少なくとも１種の化合物を含むものが好ましい。
アルカリ金属水酸化物としては水酸化ナトリウム、水酸化カリウム、水酸化リチウム等が、アルカリ金属炭酸塩としては、炭酸ナトリウム、炭酸カリウム、炭酸リチウム等が、アルカリ金属燐酸塩としては、リン酸ナトリウム、リン酸カリウム、リン酸リチウム等が挙げられる。
また、アンチモン化合物としては、三塩化アンチモン、五塩化アンチモン、酸化アンチモン等が、亜鉛化合物としては、塩化亜鉛、硫酸亜鉛、硝酸亜鉛、炭酸亜鉛等が、錫化合物としては、塩化錫第一錫、塩化第二錫、硫酸錫、フッ化錫等が、砒素化合物としては、三酸化二砒素、五酸化二砒素等が、珪酸塩としては、メタ珪酸ナトリウム、オルソ珪酸ナトリウム等が、及びヨウ化物としては、ヨウ化ナトリウム、ヨウ化カリウム等が挙げられる。
【０００８】
表面処理液の好適なアルカリ成分濃度は、アルカリ金属換算で０．０１〜１０ｋｍｏｌ／ｍ3（以下Ｍと略す）、好ましくは０．１〜１Ｍである。０．０１Ｍ未満では、密着性の向上が充分でない場合があり、また１０Ｍを越えて増量しても効果に変化がなく、経済的に不利である。
表面処理液に添加するアンチモン化合物、亜鉛化合物、錫化合物、砒素化合物、珪酸塩及びヨウ化物の好適な濃度は、それぞれ物質中の金属イオン、珪素原子、ヨウ素イオンに換算して、０．０００１〜０．１Ｍ、好ましくは０．００１〜０．０１Ｍである。０．０００１Ｍ未満では、密着性の向上が充分でない場合があり、０．１Ｍを越えて増量しても効果に変化がなく、経済的に不利である。
【０００９】
電解処理の好ましい条件は、液温２０〜９０℃、さらに好ましくは５０〜７０℃、電流密度０．１〜１００Ａ／dm2、さらに好ましくは５〜１５Ａ／dm2、処理時間１〜６００秒、さらに好ましくは３０〜２００秒である。液温が２０℃未満では密着性向上の効果が小さく、９０℃以上では液温度の管理が難しい。また、電流密度が０．１Ａ／dm2未満、処理時間が１秒未満では密着性向上の効果が小さく、電流密度が１００Ａ／dm2を越え、処理時間が６００秒を越えても効果に変化がなく、経済的に不利である。
【００１０】
本発明のステンレス鋼板は、好ましくは、表面の水酸化物皮膜中の原子％のＣｒ／Ｆｅ比が１．１以上、さらに好ましくは１．３以上である。表面の水酸化物皮膜中の原子％のＣｒ／Ｆｅ比が１．１以上であると、塗膜と反応し、密着性が向上するという点で好ましい。
本発明のステンレス鋼板は、好ましくは、表面の水酸化物皮膜及び酸化物皮膜が、アンチモン、亜鉛、錫、砒素、珪素、及びヨウ素を含まない。
【００１１】
本発明はさらに上記ステンレス鋼板を塗装してなる塗装ステンレス鋼板を提供するものである。本発明の上記表面処理を行ったステンレス鋼板の表面に塗装される塗料としては、これらに制限されないが、有機溶剤系塗料及び水溶系塗料が挙げられ、例えば、アクリル系、ポリビニル系、ポリウレタン系、ポリエステル系、エポキシ系、天然ゴム系及び合成ゴム系等の塗料が挙げられる。
ステンレス鋼板を塗装する方法は特に限定されない。塗膜の厚さは、用途により異なるが一般に０．５〜５０μm程度である。
【００１２】
本発明によれば、ステンレス鋼板をアルカリ水溶液中で陰極電解処理することにより、さらに好ましくは、ステンレス鋼板を、アルカリ金属水酸化物、アルカリ金属炭酸塩及びアルカリ金属燐酸塩からなる群から選ばれた少なくとも１種のアルカリ成分と、アンチモン化合物、亜鉛化合物、錫化合物、砒素化合物、珪酸塩及びヨウ化物からなる群から選ばれた少なくとも１種の化合物を含むアルカリ水溶液中で陰極電解処理することにより、基材金属であるステンレス鋼板表面の水酸化物皮膜中のＦｅの還元を促進し、その結果として、水酸化物皮膜中のＣｒ濃度を増加させ、ステンレス鋼板表面と塗膜との密着性が飛躍的に向上するものと考えられる。
【００１３】
【実施例】
次に本発明の実施例について説明する。ただし、本発明はその要旨を越えない限り以下の実施例に制約されるものではない。
【実施例１】
ＳＵＳ３０４ステンレス鋼の２Ｂ仕上げ材（板厚０．５mm)を、水酸化ナトリウム１Ｍにメタ珪酸ナトリウム０．００２Ｍ（珪素濃度：０．００２Ｍ）を添加した水溶液中、６０℃で、陰極電解電流密度１〜１５Ａ／dm2、電解時間１０〜１８０秒の範囲内で処理した後、水洗、乾燥させた。この後、アクリル系塗料を５〜６μｍの厚さで塗布し、１００℃で５分間焼成した後、密着性を調査した。比較例として、珪酸塩を添加しない溶液についても同様の実験を行った。
密着性の評価は、ＪＩＳ Ｚ ２２４８「金属材料曲げ試験方法」に準じた方法により行った。まず同試験方法５．３のＶブロック法（Ｖブロックの角度６０度、押金具の頂点のＲは半径１．３mm）により、Ｖブロック上に塗面を下にして試料をのせ、押金具で試料を押し込み断面形状Ｖ型とする。これを同試験方法の図３に示す密着曲げ（ｔ＝０）を行う。ｔ＝０の密着曲げ加工、すなわち０Ｔ曲げ加工後、塗膜の剥離の程度を拡大鏡で判定し、●：亀裂も剥離も無し、△：亀裂はあるが剥離は無し、×：剥離有り、の３段階で評価した。
結果を図１に示す。水酸化ナトリウム溶液中にケイ酸塩を添加すると、無添加のものと比べて密着性が飛躍的に向上することが分かる。
【００１４】
【実施例２】
ＳＵＳ３０４ステンレス鋼の２Ｂ仕上げ材（板厚０．５mm)を、水酸化ナトリウム１Ｍを基本溶液として、以下に示す各物質を０．００２Ｍ添加した水溶液中、６０℃で、陰極電解電流密度５Ａ／dm2、電解時間６０秒で処理した後、水洗、乾燥させた。この後、アクリル系塗料、エポキシ系塗料、アクリロニトリルブタジエンゴム（以下ＮＢＲと略す）又はフッ素ゴムを５〜６μｍの厚さで塗布し、アクリル系塗料を塗布したものは１００℃で５分間、エポキシ系塗料を塗布したものは１８０℃で３０分間、ＮＢＲを塗布したものは２２０℃で１０分間、フッ素ゴムを塗布したものは２００℃で３０分間、それぞれ焼成した後、密着性を調査した。
【００１５】
・メタ珪酸ナトリウム０．００２Ｍ（珪素濃度：０．００２Ｍ）
・三塩化アンチモン ０．００２Ｍ（アンチモン濃度：０．００２Ｍ）
・ヨウ化ナトリウム ０．００２Ｍ（ヨウ素濃度：０．００２Ｍ）
・塩化亜鉛 ０．００２Ｍ（亜鉛濃度：０．００２Ｍ）
・塩化第一錫 ０．００２Ｍ（錫濃度：０．００２Ｍ）
・三酸化二砒素 ０．００１Ｍ（砒素濃度：０．００１Ｍ）
比較例として、未処理材及び上記に示した各物質を添加しない溶液についても同様の実験を行った。密着性の評価は密着曲げ（０Ｔ）で行った。０Ｔ曲げ加工後、塗膜の剥離の程度を拡大鏡で判定し、●：亀裂も剥離も無し、△：亀裂はあるが剥離は無し、×：剥離有り、の３段階で評価した。結果を表１に示す。水酸化ナトリウム溶液中に上記に示した各物質を添加すると、未処理材及び無添加のものと比べて密着性が飛躍的に向上することが分かる。表１において「−」は試料を作成しなかったことを示す。
【００１６】
【表１】
表１ 密着曲げ試験結果
次に、本発明溶液中でのカソード分極曲線を測定した。試験溶液は実施例２と同じものを用いた。供試材はＳＵＳ３０４ステンレス鋼の２Ｂ仕上げ材（板厚０．５mm)、試験温度は６０℃である。なお、測定前にアルゴンによる脱気を行った。結果を図２に示す。
本発明溶液中と無添加溶液中で測定したカソード分極曲線を比べると、自然腐食電位から−１２００ｍＶまでは、本発明溶液の方が高い電流密度を示し、−１２００ｍＶより卑な電位では両者の分極曲線は一致した。また、全ての溶液において、−９５０ｍＶ付近に電流密度のピーク（極大値）が認められた。ここで、実験に使用した溶液のｐＨは１３〜１４の範囲内であったことから、本発明溶液及び無添加溶液中での理論上の水素発生電位は式（１）より、−１０９８ｍＶ〜−１１６４ｍＶの範囲内である。
ＥH＝０．１９８Ｔ・ｐＨ−２４１（ｍＶ ｖｓ．ＳＣＥ） …（１）
ＥH＝水素酸化還元電位
Ｔ：絶対温度（Ｋ）
ｐＨ：溶液のｐＨ
−９５０ｍＶ付近で電流密度のピーク（極大値）が認められた要因としては、酸化皮膜中の鉄の還元電流（Ｆｅ3+→Ｆｅ2+）が考えられる。したがって、本発明溶液は不動態皮膜中の鉄の還元を促進していると考えられる。
【００１８】
【実施例３】
ＳＵＳ３０４ステンレス鋼のＢＡ仕上げ材（板厚０．４mm)を、水酸化ナトリウム１Ｍにメタ珪酸ナトリウム０．００２Ｍ（珪素濃度：０．００２Ｍ）を添加した水溶液中、６０℃で、陰極電解電流密度５Ａ／dm2、電解時間６０秒で処理した後、水洗、乾燥させた。この後、Ｘ線光電子分光法（ＸＰＳ）を用いて表面分析を行った。比較例として、未処理材及び珪酸塩を添加しない溶液で処理したものについても同様の実験を行った。結果を表２に示す。
各供試材の皮膜構造は、上層が水酸化物皮膜、下層が酸化物皮膜の２層構造となっていた。本発明の珪酸塩を添加した溶液中で陰極電解処理を施したものは、未処理材及び無添加のものと比べて、塗膜との密着性に直接関与する最も上層にある水酸化物皮膜中の原子％のＣｒ／Ｆｅ比が増加していた。すなわち、本発明の陰極電解処理は、水酸化物皮膜中のＦｅの還元を促進し、その結果として、水酸化物皮膜中のＣｒ濃度を増加させ、密着性が飛躍的に向上したと推定される。
【表２】
表２ ＸＰＳ分析結果
【発明の効果】
以上の結果から明らかなように、本発明の表面処理ステンレス鋼板は、基材と塗膜との密着性が極めて優れており、塗装金属材料が使用される用途、例えば、内外装建材、家電、ＯＡ機器などに好適に使用できる。さらに、本発明の方法はステンレス鋼板の生産性に優れ、また、本発明に使用する処理液の廃液処理も比較的簡単な方法で行うことができる。
【図面の簡単な説明】
【図１】実施例１により製造した、アクリル系塗料を塗布したステンレス鋼板の密着性の評価結果を示す図面である。●：亀裂も剥離も無し、△：亀裂はあるが剥離は無し、×：剥離有り
【図２】種々の処理液を用いてＳＵＳ３０４ステンレス鋼のカソード分極曲線を調べた結果を示す図面である。ＮａＯＨ：水酸化ナトリウム水溶液、Ｓｉ：メタ珪酸ナトリウム添加溶液、Ｓｂ：三塩化アンチモン添加溶液、Ｉ：ヨウ化ナトリウム添加溶液[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stainless steel plate excellent in coating film adhesion, a coated stainless steel plate obtained by coating the same, and a method for producing them. More specifically, the present invention relates to a stainless steel plate obtained by cathodic electrolysis in an alkaline solution using the stainless steel plate surface as a cathode, a coated stainless steel plate obtained by coating the stainless steel plate, and a method for producing them.
[0002]
[Prior art]
In recent years, with the diversification and sophistication of needs for metal materials, there has been an increasing demand for metal materials to which high functions such as design improvement by coloring, corrosion resistance and lubricity are added.
An important technical problem in the coating of metallic materials is the adhesion of the coating film. If this is insufficient, blistering will occur, and eventually it will cause bruising. In the case of a pre-coated steel sheet, appearance deterioration due to peeling of the coating film or mold pressing due to the peeled coating powder occurs during the forming process.
[0003]
In order to improve the adhesion between the metal material and the coating film, mechanical unevenness can be achieved by applying a chromate treatment to the surface of the metal material to form a coating film with good adhesion, or by applying a sand blast treatment. The method of generating is generally performed. However, the former has a problem of waste liquid treatment of chromic acid, and furthermore, since hexavalent chromium which is a harmful heavy metal exists at the interface between the metal material and the coating film, it tends to be avoided from environmental problems in recent years. In addition, the latter is difficult to manage the blasting sand as well as the environmental problem of dust, and it is very difficult to keep it on a certain skin. Furthermore, since the adhesion is adversely affected if the coating is applied with the sand attached to the surface, the cleaning after the treatment requires severe management.
[0004]
[Problems to be solved by the invention]
The first object of the present invention is to provide a stainless steel plate excellent in coating film adhesion.
The second object of the present invention is to provide a coated stainless steel sheet having excellent coating film adhesion.
The third object of the present invention is to provide a method for producing a stainless steel plate having excellent coating film adhesion without causing environmental problems.
The fourth object of the present invention is to provide a method for producing a coated stainless steel sheet having good productivity and excellent coating film adhesion.
[0005]
[Means for Solving the Problems]
This invention provides the stainless steel plate excellent in the coating-film adhesiveness formed by cathodic electrolytic treatment in alkaline aqueous solution, and the article manufactured from this stainless steel plate. The present invention further includes a method for producing a stainless steel sheet excellent in coating film adhesion, characterized by cathodic electrolytic treatment of a stainless steel sheet in an alkaline aqueous solution, and a coated stainless steel characterized by coating the obtained stainless steel sheet The manufacturing method of a steel plate is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
Examples of the stainless steel plate to be surface-treated in the present invention include all stainless steel plates such as martensite, ferrite, and austenite. Generally, the stainless steel plate subjected to the surface treatment of the present invention has been surface-finished in advance, and examples of the surface finish include bright annealing finish, pickling finish, hard finish and polishing finish.
[0007]
The alkaline aqueous solution (surface treatment liquid) used in the present invention is at least one alkali component selected from the group consisting of alkali metal hydroxides, alkali metal carbonates and alkali metal phosphates, an antimony compound, a zinc compound, Those containing at least one compound selected from the group consisting of tin compounds, arsenic compounds, silicates and iodides are preferred.
Examples of the alkali metal hydroxide include sodium hydroxide, potassium hydroxide, and lithium hydroxide. Examples of the alkali metal carbonate include sodium carbonate, potassium carbonate, and lithium carbonate. Examples of the alkali metal phosphate include sodium phosphate, Examples include potassium phosphate and lithium phosphate.
Further, as the antimony compound, antimony trichloride, antimony pentachloride, antimony oxide, etc., as the zinc compound, zinc chloride, zinc sulfate, zinc nitrate, zinc carbonate, etc., as the tin compound, stannous tin chloride, Stannic chloride, tin sulfate, tin fluoride, etc., as arsenic compounds, diarsenic trioxide, diarsenic pentoxide, etc., as silicates, sodium metasilicate, sodium orthosilicate, etc. and as iodide Examples thereof include sodium iodide and potassium iodide.
[0008]
A suitable alkali component concentration of the surface treatment liquid is 0.01 to 10 kmol / m 3 (hereinafter abbreviated as M) in terms of alkali metal, preferably 0.1 to 1M. If the amount is less than 0.01M, the adhesion may not be sufficiently improved, and even if the amount exceeds 10M, the effect is not changed, which is economically disadvantageous.
Suitable concentrations of antimony compound, zinc compound, tin compound, arsenic compound, silicate and iodide to be added to the surface treatment liquid are 0.0001 to, in terms of metal ion, silicon atom and iodine ion in the substance, respectively. 0.1M, preferably 0.001 to 0.01M. If the amount is less than 0.0001M, the adhesion may not be sufficiently improved. Even if the amount exceeds 0.1M, the effect is not changed, which is economically disadvantageous.
[0009]
The preferable conditions for the electrolytic treatment are a liquid temperature of 20 to 90 ° C., more preferably 50 to 70 ° C., a current density of 0.1 to 100 A / dm 2 , more preferably 5 to 15 A / dm 2 , a treatment time of 1 to 600 seconds, More preferably, it is 30 to 200 seconds. When the liquid temperature is less than 20 ° C., the effect of improving the adhesion is small, and when the liquid temperature is 90 ° C. or higher, the liquid temperature is difficult to manage. Also, if the current density is less than 0.1 A / dm 2 and the treatment time is less than 1 second, the effect of improving the adhesion is small, and the effect changes even if the current density exceeds 100 A / dm 2 and the treatment time exceeds 600 seconds. There is no economic disadvantage.
[0010]
In the stainless steel plate of the present invention, the atomic% Cr / Fe ratio in the surface hydroxide film is preferably 1.1 or more, more preferably 1.3 or more. It is preferable that the atomic% Cr / Fe ratio in the hydroxide film on the surface is 1.1 or more in that it reacts with the coating film and adhesion is improved.
In the stainless steel plate of the present invention, the hydroxide film and oxide film on the surface preferably do not contain antimony, zinc, tin, arsenic, silicon and iodine.
[0011]
The present invention further provides a coated stainless steel sheet obtained by coating the above stainless steel sheet. Examples of the paint applied to the surface of the stainless steel plate subjected to the surface treatment of the present invention include, but are not limited to, organic solvent-based paints and water-based paints, such as acrylic, polyvinyl, polyurethane, Examples thereof include paints such as polyester, epoxy, natural rubber, and synthetic rubber.
The method for coating the stainless steel plate is not particularly limited. Although the thickness of a coating film changes with uses, generally it is about 0.5-50 micrometers.
[0012]
According to the present invention, the stainless steel sheet is more preferably selected from the group consisting of alkali metal hydroxides, alkali metal carbonates and alkali metal phosphates by cathodic electrolysis in an aqueous alkaline solution. Cathodic electrolytic treatment in an alkaline aqueous solution containing at least one alkali component and at least one compound selected from the group consisting of antimony compounds, zinc compounds, tin compounds, arsenic compounds, silicates and iodides, Promotes the reduction of Fe in the hydroxide film on the surface of the stainless steel plate, which is the base metal. As a result, the Cr concentration in the hydroxide film is increased, and the adhesion between the stainless steel plate surface and the coating film is dramatically improved. This is thought to improve.
[0013]
【Example】
Next, examples of the present invention will be described. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded.
[Example 1]
SUS304 stainless steel 2B finishing material (plate thickness 0.5 mm), cathodic electrolysis current density 1 at 60 ° C. in an aqueous solution obtained by adding 0.002 M sodium metasilicate (silicon concentration: 0.002 M) to 1 M sodium hydroxide After processing within a range of -15 A / dm 2 and electrolysis time of 10 to 180 seconds, it was washed with water and dried. Thereafter, an acrylic paint was applied at a thickness of 5 to 6 μm, baked at 100 ° C. for 5 minutes, and then the adhesion was investigated. As a comparative example, a similar experiment was performed for a solution to which no silicate was added.
The adhesion was evaluated by a method according to JIS Z 2248 “Metal material bending test method”. First, using the V-block method of the same test method 5.3 (V-block angle 60 degrees, R at the top of the metal fitting is a radius of 1.3 mm), place the sample with the coating surface down on the V-block, The sample is pressed into a V-shaped cross section. This is subjected to close contact bending (t = 0) shown in FIG. After close contact bending at t = 0, that is, after 0T bending, the degree of peeling of the coating film was determined with a magnifying glass. ●: No cracking or peeling, Δ: Cracking but no peeling, ×: With peeling, It was evaluated in three stages.
The results are shown in FIG. It can be seen that when silicate is added to the sodium hydroxide solution, the adhesion is dramatically improved as compared with the case of no addition.
[0014]
[Example 2]
SUS304 stainless steel 2B finish (plate thickness: 0.5 mm), cathodic electrolysis current density 5 A / dm at 60 ° C. in an aqueous solution containing 0.002 M of each of the following substances with 1 M sodium hydroxide as a basic solution 2. After treatment with electrolysis time of 60 seconds, washed with water and dried. After this, acrylic paint, epoxy paint, acrylonitrile butadiene rubber (hereinafter abbreviated as NBR) or fluorine rubber is applied in a thickness of 5 to 6 μm, and the acrylic paint is applied at 100 ° C. for 5 minutes. The coating was applied at 180 ° C. for 30 minutes, the NBR applied at 220 ° C. for 10 minutes, and the fluororubber applied at 200 ° C. for 30 minutes.
[0015]
-Sodium metasilicate 0.002M (silicon concentration: 0.002M)
-Antimony trichloride 0.002M (antimony concentration: 0.002M)
・ Sodium iodide 0.002M (iodine concentration: 0.002M)
・ Zinc chloride 0.002M (Zinc concentration: 0.002M)
-Stannous chloride 0.002M (Tin concentration: 0.002M)
・ Diarsenic trioxide 0.001M (Arsenic concentration: 0.001M)
As a comparative example, the same experiment was also performed on an untreated material and a solution to which each of the above-described substances was not added. The evaluation of adhesion was performed by adhesion bending (0T). After the 0T bending process, the degree of peeling of the coating film was judged with a magnifying glass, and evaluated by three stages: ●: no crack or peeling, Δ: cracking but no peeling, ×: peeling. The results are shown in Table 1. It can be seen that when each of the substances shown above is added to the sodium hydroxide solution, the adhesion is dramatically improved as compared with the untreated material and the non-treated material. In Table 1, “-” indicates that no sample was prepared.
[0016]
[Table 1]
Table 1 Results of adhesion bending test
Next, the cathodic polarization curve in the solution of the present invention was measured. The same test solution as in Example 2 was used. The test material is a SUS304 stainless steel 2B finish (plate thickness 0.5 mm), and the test temperature is 60 ° C. In addition, deaeration with argon was performed before the measurement. The results are shown in FIG.
Comparing the cathodic polarization curves measured in the solution of the present invention and in the additive-free solution, the solution of the present invention shows a higher current density from the natural corrosion potential to -1200 mV, and the polarization of both is lower at a potential lower than -1200 mV. The curves matched. In all the solutions, a current density peak (maximum value) was observed at around -950 mV. Here, since the pH of the solution used in the experiment was in the range of 13 to 14, the theoretical hydrogen generation potential in the solution of the present invention and the additive-free solution was -1098 mV to- It is within the range of 1164 mV.
E H = 0.198T · pH-241 (mV vs. SCE) (1)
E H = hydrogen redox potential T: absolute temperature (K)
pH: pH of the solution
As a factor in which the peak of the current density (maximum value) was observed around −950 mV, the reduction current of iron in the oxide film (Fe 3+ → Fe 2+ ) is considered. Therefore, it is considered that the solution of the present invention promotes the reduction of iron in the passive film.
[0018]
[Example 3]
SUS304 stainless steel BA finish (plate thickness: 0.4 mm), cathodic electrolysis current density 5A at 60 ° C in an aqueous solution of sodium hydroxide 1M with sodium metasilicate 0.002M (silicon concentration: 0.002M) After treating with / dm 2 and electrolysis time of 60 seconds, it was washed with water and dried. Thereafter, surface analysis was performed using X-ray photoelectron spectroscopy (XPS). As a comparative example, the same experiment was also performed on a non-treated material and a non-treated material treated with a solution not added with silicate. The results are shown in Table 2.
The film structure of each test material was a two-layer structure in which the upper layer was a hydroxide film and the lower layer was an oxide film. What was subjected to cathodic electrolysis in the solution containing the silicate of the present invention is the uppermost hydroxide film that is directly related to the adhesion to the coating film, compared to the untreated material and the non-treated material The atomic% Cr / Fe ratio in the medium increased. That is, it is estimated that the cathodic electrolysis treatment of the present invention promotes the reduction of Fe in the hydroxide film and, as a result, increases the Cr concentration in the hydroxide film, thereby improving the adhesion dramatically. The
[Table 2]
Table 2 XPS analysis results
【The invention's effect】
As is clear from the above results, the surface-treated stainless steel sheet of the present invention has extremely excellent adhesion between the base material and the coating film, and is used for applications where a coated metal material is used, for example, interior / exterior building materials, home appliances, It can be suitably used for OA equipment. Furthermore, the method of the present invention is excellent in the productivity of stainless steel plates, and the waste liquid treatment of the treatment liquid used in the present invention can be performed by a relatively simple method.
[Brief description of the drawings]
1 is a drawing showing the results of evaluating the adhesion of a stainless steel plate coated with an acrylic paint produced in Example 1. FIG. ●: No cracks or peeling, Δ: Cracks but no peeling, X: Peeling FIG. 2 is a drawing showing the results of examining the cathode polarization curve of SUS304 stainless steel using various treatment solutions. NaOH: sodium hydroxide aqueous solution, Si: sodium metasilicate addition solution, Sb: antimony trichloride addition solution, I: sodium iodide addition solution
Claims (10)
ステンレス鋼板をアルカリ水溶液中で陰極電解処理する工程を含み、 Including a step of cathodic electrolytic treatment of a stainless steel sheet in an alkaline aqueous solution,
アルカリ水溶液が、アルカリ金属水酸化物、アルカリ金属炭酸塩及びアルカリ金属燐酸塩からなる群から選ばれた少なくとも１種のアルカリ成分と、アンチモン化合物、亜鉛化合物、錫化合物、砒素化合物、珪酸塩及びヨウ化物からなる群から選ばれた少なくとも１種の化合物を含み、 The alkaline aqueous solution contains at least one alkali component selected from the group consisting of alkali metal hydroxides, alkali metal carbonates and alkali metal phosphates, antimony compounds, zinc compounds, tin compounds, arsenic compounds, silicates and iodines. Comprising at least one compound selected from the group consisting of
電解処理が、液温２０〜９０℃、電流密度０．１〜１００Ａ／ｄｍ Electrolytic treatment is performed at a liquid temperature of 20 to 90 ° C. and a current density of 0.1 to 100 A / dm. 22 、処理時間１〜６００秒で行われることを特徴とするステンレス鋼板の製造方法。The method for producing a stainless steel sheet, wherein the treatment time is 1 to 600 seconds.
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