JP5565191B2 - 溶融Al−Zn系めっき鋼板 - Google Patents
溶融Al−Zn系めっき鋼板 Download PDFInfo
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- JP5565191B2 JP5565191B2 JP2010180663A JP2010180663A JP5565191B2 JP 5565191 B2 JP5565191 B2 JP 5565191B2 JP 2010180663 A JP2010180663 A JP 2010180663A JP 2010180663 A JP2010180663 A JP 2010180663A JP 5565191 B2 JP5565191 B2 JP 5565191B2
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- steel sheet
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- 229910000831 Steel Inorganic materials 0.000 title claims description 50
- 239000010959 steel Substances 0.000 title claims description 50
- 229910018137 Al-Zn Inorganic materials 0.000 title claims description 41
- 229910018573 Al—Zn Inorganic materials 0.000 title claims description 41
- 238000007747 plating Methods 0.000 claims description 42
- 239000011247 coating layer Substances 0.000 claims description 22
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 15
- 210000001787 dendrite Anatomy 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 32
- 230000007797 corrosion Effects 0.000 description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- 239000011248 coating agent Substances 0.000 description 18
- 238000000576 coating method Methods 0.000 description 18
- 239000000126 substance Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000011282 treatment Methods 0.000 description 11
- 230000013011 mating Effects 0.000 description 10
- 239000011701 zinc Substances 0.000 description 9
- 229910000905 alloy phase Inorganic materials 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 238000004070 electrodeposition Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 238000007739 conversion coating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 210000004894 snout Anatomy 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
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- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
非合わせ部の耐食性や加工性の観点から、Al-Zn系めっき皮膜中のAl含有量は20〜95mass%、好ましくは45〜85mass%とし、残部Znおよび不可避的不純物とする。
本発明者等が、溶融Al-Zn系めっき鋼板の合わせ部の耐食性が劣る原因を究明したところ、合わせ部では長時間湿潤雰囲気に曝されるためAl-Zn系めっき皮膜のデンドライト凝固組織相に存在する空隙に沿って腐食が進行するためであることが明らかになった。そこで、化学的に安定な酸化アルミニウムおよび/または水酸化アルミニウムを含む被覆層でAl-Zn系めっき皮膜を覆って空隙を密封すれば、腐食の進行を阻止でき、耐食性を向上できることになる。被覆層中の酸化アルミニウムおよび/または水酸化アルミニウムの含有量は、Al-Zn系めっき皮膜の空隙を密封できる量であればよい。Al-Zn系めっき皮膜の空隙を効果的に密封するためには、被覆層のほぼ100%が酸化アルミニウムおよび/または水酸化アルミニウムであることが好ましい。しかし、被覆層の厚さが0.1μm未満ではこうした効果が十分に得られず、5μmを超えると化成処理性が低下するので、被覆層の厚さは0.1〜5μmとする必要がある。なお、化成処理性をより安定化させるために、被覆層の厚さは0.1〜2μmとすることがより好ましい。
合わせ部の耐食性試験:図1に示すように、板厚0.8mm、幅70mm、長さ150mmで、鋼板片面当りのめっき量が45g/m2の合金化溶融Znめっき鋼板に、各試料から採取した幅40mm、長さ110mmの試験片を3点でスポット溶接して合わせ部を形成後、図2に示す1サイクルの条件(SAE J 2334)で湿潤工程より開始し、120サイクルの耐食性試験を行った。耐食性試験後、合わせ部を分解して試験片上の錆やめっき皮膜を除去し、腐食されている部位を20mm×15mmのサイズの単位区画で10区画に分け、マイクロメータを用いて各区画の最大腐食深さを腐食してない健全部に対する板厚差として求め、求めた各区画の最大腐食深さのデータにGumbel分布を適用して極値統計解析を行い、最大腐食深さの最頻値を求め、最大腐食深さの最頻値が0.5μm以下であれば、合わせ部の耐食性に優れるとした。
Claims (2)
- 鋼板表面に、順に、Al含有量が20〜95mass%であるAl−Zn系めっき皮膜と、酸化アルミニウムおよび/または水酸化アルミニウムを含む厚さ0.1〜5μmの被覆層とを有し、
前記被覆層は、前記Al−Zn系めっき皮膜のデンドライト凝固組織相に存在する空隙を密封することを特徴とする溶融Al-Zn系めっき鋼板。 - 被覆層の厚さが0.1〜2μmであることを特徴とする請求項1に記載の溶融Al−Zn系めっき鋼板。
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JP5565191B2 true JP5565191B2 (ja) | 2014-08-06 |
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KR102153162B1 (ko) * | 2017-12-26 | 2020-09-07 | 주식회사 포스코 | 알루미늄합금 도금강판의 표면처리방법 및 이에 따라 제조된 알루미늄합금 도금강판 |
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JPS6456881A (en) * | 1987-08-28 | 1989-03-03 | Nippon Steel Corp | Black molten zinc-aluminum alloy plated steel sheet and its production |
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