JP4312635B2 - 耐食性に優れた塗装アルミニウムめっき鋼板 - Google Patents
耐食性に優れた塗装アルミニウムめっき鋼板 Download PDFInfo
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- JP4312635B2 JP4312635B2 JP2004075704A JP2004075704A JP4312635B2 JP 4312635 B2 JP4312635 B2 JP 4312635B2 JP 2004075704 A JP2004075704 A JP 2004075704A JP 2004075704 A JP2004075704 A JP 2004075704A JP 4312635 B2 JP4312635 B2 JP 4312635B2
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- 230000007797 corrosion Effects 0.000 title claims description 65
- 238000005260 corrosion Methods 0.000 title claims description 65
- 229910000680 Aluminized steel Inorganic materials 0.000 title claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 51
- 239000000126 substance Substances 0.000 claims description 50
- 229910000831 Steel Inorganic materials 0.000 claims description 43
- 239000010959 steel Substances 0.000 claims description 43
- 238000007747 plating Methods 0.000 claims description 36
- 150000003609 titanium compounds Chemical class 0.000 claims description 29
- 229910018125 Al-Si Inorganic materials 0.000 claims description 24
- 229910018520 Al—Si Inorganic materials 0.000 claims description 24
- 150000003755 zirconium compounds Chemical class 0.000 claims description 24
- 239000002131 composite material Substances 0.000 claims description 21
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 19
- 229910019142 PO4 Inorganic materials 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 15
- 239000010452 phosphate Substances 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 11
- 159000000003 magnesium salts Chemical class 0.000 claims description 10
- 229960002261 magnesium phosphate Drugs 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical group [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 6
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- MHJAJDCZWVHCPF-UHFFFAOYSA-L dimagnesium phosphate Chemical compound [Mg+2].OP([O-])([O-])=O MHJAJDCZWVHCPF-UHFFFAOYSA-L 0.000 claims description 5
- 229910000395 dimagnesium phosphate Inorganic materials 0.000 claims description 5
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 5
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 5
- 239000004137 magnesium phosphate Substances 0.000 claims description 5
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 5
- YOYLLRBMGQRFTN-SMCOLXIQSA-N norbuprenorphine Chemical compound C([C@@H](NCC1)[C@]23CC[C@]4([C@H](C3)C(C)(O)C(C)(C)C)OC)C3=CC=C(O)C5=C3[C@@]21[C@H]4O5 YOYLLRBMGQRFTN-SMCOLXIQSA-N 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- DXIGZHYPWYIZLM-UHFFFAOYSA-J tetrafluorozirconium;dihydrofluoride Chemical compound F.F.F[Zr](F)(F)F DXIGZHYPWYIZLM-UHFFFAOYSA-J 0.000 claims description 4
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 235000011010 calcium phosphates Nutrition 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 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 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229920005672 polyolefin resin Polymers 0.000 claims description 2
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- 235000021317 phosphate Nutrition 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 11
- 239000011651 chromium Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 10
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- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 230000009471 action Effects 0.000 description 8
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- -1 aluminum trihydrogen phosphate Chemical compound 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
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- 229910052725 zinc Inorganic materials 0.000 description 4
- 229920001665 Poly-4-vinylphenol Polymers 0.000 description 3
- 229910007570 Zn-Al Inorganic materials 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 150000001845 chromium compounds Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 2
- 229910009369 Zn Mg Inorganic materials 0.000 description 2
- 229910007573 Zn-Mg Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
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- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
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- 229910052719 titanium Inorganic materials 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- LDMRLRNXHLPZJN-UHFFFAOYSA-N 3-propoxypropan-1-ol Chemical compound CCCOCCCO LDMRLRNXHLPZJN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 108091006629 SLC13A2 Proteins 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
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- 239000002519 antifouling agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
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- 235000001055 magnesium Nutrition 0.000 description 1
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- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
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- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/36—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including layers graded in composition or physical properties
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
チタン化合物,ジルコニウム化合物には、ヘキサフルオロチタン酸,ヘキサフルオロジルコニウム酸及びそれらの金属酸塩から選ばれた1種又は2種以上が使用される。化成皮膜は、フェノール樹脂,アクリル樹脂,アクリルオレフィン樹脂,ポリウレタン樹脂等の有機樹脂を含む有機-無機複合皮膜であっても良い。下塗り塗膜に含まれるマグネシウム塩にはリン酸水素マグネシウム,リン酸マグネシウム,トリポリリン酸マグネシウムの1種又は2種以上,リン酸塩にはリン酸亜鉛,トリポリリン酸二水素アルミニウム,リン酸アルミニウム,リン酸カルシウムの1種又は2種以上が使用される。
難溶性腐食生成物Y1〜Y3が緻密皮膜として生成するため、以後の腐食を抑制するバリア層として働く。バリア層が形成された後でも、クラック9に臨む下地鋼1の露出表面やめっき層5の破面及びSi粒3,Fe-Al-Si金属間化合物粒4の界面の腐食抑制に有効なMgイオン,リン酸イオンが恒常的に供給され、欠陥部が自己修復される。
化成処理に先立って、塗装原板を脱脂,酸洗,表面調整して洗浄する。清浄化されためっき層5に化成処理液を塗布し、水洗することなく乾燥させると自己修復作用のある化成皮膜6が形成される。
下塗り塗料の上に、好ましくは10〜300μmの上塗り塗膜が設けられる。上塗り用には、ポリエステル,ウレタン,アクリル,シリコーン変性ポリエステル,シリコーンアクリル,ポリ塩化ビニル,ポリフッ化ビニリデン-アクリル等の熱硬化性又は熱可塑性樹脂をベースとし,必要に応じ着色顔料,体質顔料,有機系骨材,無機系骨材,メタリック粉末,潤滑剤,汚れ防止剤,防かび剤,紫外線吸収剤,光安定剤(酸化防止剤),光触媒粒子,艶消し剤等の各種添加剤が配合した塗料組成物が使用される。該塗料組成物には、下塗り塗料と同様にマグネシウム塩,リン酸塩系防錆顔料の1種又は2種以上を添加しても良い。
このように、Al-Siめっき層が形成されたアルミニウムめっき鋼板を塗装原板に用い、塗装原板の表面に有機-無機複合皮膜を介して非クロム系の下塗り塗膜を形成するとき、従来のクロメート皮膜の上にクロム系下塗り塗膜を設けた塗装鋼板に匹敵する塗膜密着性,加工性が得られる。しかも、クロムを含んでいないことから、環境に優しい素材として種々の分野で使用される。
〔表面調整〕
アルミニウムめっき鋼板に、液温65℃に調整したアルカリ脱脂水溶液(サーフクリーナー1089N-1:日本ペイント株式会社製)をスプレーして5秒間接触させた後、湯洗・水洗により洗浄して乾燥した。
ヘキサフルオロチタン酸:55g/l,ヘキサフルオロジルコニウム酸:10g/l,アミノメチル置換ポリビニルフェノール:72g/lを含む温度20℃の塗布型クロムフリー化成処理液を表面調整後のめっき層表面に塗布し、水洗することなく100℃で乾燥した。乾燥後のめっき層表面を分析すると、Ti換算付着量:10mg/m2のチタン化合物,Zr換算付着量:2.5mg/m2のジルコニウム化合物,F換算付着量:20mg/m2のフッ化物,ポリビニルフェノール換算付着量:40mg/m2の有機成分を含む有機-無機複合皮膜が形成されていた。
エポキシ樹脂をベースとし、防錆顔料の他に酸化チタン(着色顔料),硫酸バリウム(体質顔料),シリカ粉末(体質顔料)を配合した下塗り塗料を化成処理後の塗装原板に塗布し、215℃の乾燥・焼付けにより乾燥膜厚:5μmの下塗り塗膜を形成した。
チタン化合物,ジルコニウム化合物と有機成分を含む有機-無機複合皮膜が設けられた塗装原板には、リン酸水素マグネシウム,リン酸マグネシウム,リン酸亜鉛,トリポリリン酸アルミニウムを配合したクロムフリー下塗り塗料を塗布した。
次いで、ポリエステル樹脂をベースとする上塗り塗料を塗布し、215℃の乾燥・焼付けにより乾燥膜厚15μmの上塗り塗膜を下塗り塗膜に積層した。
作製された各塗装鋼板から試験片を切り出し、塗膜密着性試験,促進腐食試験,屋外暴露腐食試験に供した。
評価対象の塗膜面を外側に設定し、20℃に調整された室内で2t密着折曲げ加工し、折曲げ部に対する粘着テープの貼付け・引剥がしにより塗膜の剥離状況を観察した。剥離しなかった塗膜を◎,5%以下の剥離が発生した塗膜をO,5〜20%の剥離が発生した塗膜を△,21%以上剥離が発生した塗膜を×として塗膜密着性を評価した。
なお、加工ままの状態においては、何れの塗膜構成でもめっき層のクラックが下塗り,上塗り塗膜に伝播して塗膜のクラックが加工部に視認されたが、塗膜自体に剥離等の異常は生じていなかった。
塗装鋼板の上部塗膜面を外側に保持して2t折曲げ加工した後、左右,下部の切断端面部及び裏面を塗料で補修した試験片を用意した。60サイクルの酸性雨複合腐食試験〔1サイクル:0.1%NaC1腐食液噴霧(35℃×1時間,硫酸でpH調整)→乾燥(50℃×4時間)→湿潤(50℃×3時間,相対湿度98%)〕した後、折曲げ加工部を観察して白錆発生状況を調査した。試験対象部の面積に対する白錆発生率(面積%)を算出し、白錆が発生していない試験片を◎,白錆発生面積率が5面積%以下を○,5〜15面積%を△,15面積%以上を×として折曲げ加工部の耐食性を評価した。
暴露試験角度:35度の屋外暴露腐食試験では、促進耐食性試験とは逆に、腐食性飛来物を含む雨水が溜まりやすい下部の腐食が促進される状況になる。そこで、塗装鋼板の下部塗膜面を外側に保持して2t折曲げ加工した後、左右,上部の切断端面及び裏面を塗料で補修した試験片を用意した。千葉県市川市の東京湾岸から約5m内陸にある暴露試験場で6ヵ月間屋外暴露試験した後、折曲げ加工部を観察して白錆発生状況を調査した。試験対象部の面積に対する薄い滲み状の白錆発生率(面積%)を算出し、白錆発生率が5面積%以下を◎,6〜10面積%を○,11〜20面積%を△,20面積%以上を×として折曲げ加工部の耐食性を評価した。
X:腐食性イオン Y1〜Y3:難溶性腐食生成物
Claims (5)
- Al-Siめっき層の上に、チタン化合物及び/又はジルコニウム化合物、並びにフッ化物を含む化成皮膜を介し、マグネシウム塩及びリン酸塩が配合された下塗り塗膜が積層されていることを特徴とする耐食性に優れた塗装アルミニウムめっき鋼板。
- 前記チタン化合物及び/又はジルコニウム化合物がヘキサフルオロチタン酸,ヘキサフルオロジルコニウム酸及びそれらの金属酸塩から選ばれた1種又は2種以上である、請求項1記載の塗装アルミニウムめっき鋼板。
- 前記化成皮膜がフェノール樹脂,アクリル樹脂,アクリルオレフィン樹脂,ポリウレタン樹脂から選ばれた一種又は二種以上の有機樹脂を含む有機−無機複合皮膜である請求項1記載の塗装アルミニウムめっき鋼板。
- 前記マグネシウム塩がリン酸水素マグネシウム,リン酸マグネシウム,トリポリリン酸マグネシウムの一種又は二種以上である請求項1記載の塗装アルミニウムめっき鋼板。
- 前記リン酸塩がリン酸亜鉛,トリポリリン酸二水素アルミニウム,リン酸アルミニウム,リン酸カルシウムの一種又は二種以上である請求項1記載の塗装アルミニウムめっき鋼板。
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