JP2007016267A - 合金化溶融亜鉛めっき鋼板の製造方法および合金化溶融亜鉛めっき鋼板 - Google Patents
合金化溶融亜鉛めっき鋼板の製造方法および合金化溶融亜鉛めっき鋼板 Download PDFInfo
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- JP2007016267A JP2007016267A JP2005197493A JP2005197493A JP2007016267A JP 2007016267 A JP2007016267 A JP 2007016267A JP 2005197493 A JP2005197493 A JP 2005197493A JP 2005197493 A JP2005197493 A JP 2005197493A JP 2007016267 A JP2007016267 A JP 2007016267A
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- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title abstract description 23
- 239000007864 aqueous solution Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000005246 galvanizing Methods 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 32
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- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 24
- 239000008397 galvanized steel Substances 0.000 claims description 24
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
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- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
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- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
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- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
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- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
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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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/53—Treatment of zinc or alloys based thereon
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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Abstract
【解決手段】鋼板に溶融亜鉛めっきを施し、さらに加熱処理により合金化し、調質圧延を施した後、酸性溶液に接触させ、接触終了後1〜30秒放置した後、水洗を行うことにより、亜鉛めっき鋼板表面に10nm以上のZn系酸化物層を形成する合金化溶融亜鉛めっき鋼板の製造する際に、前記水洗を、P濃度が0.5〜5000ppmであるP含有水溶液により行うこととする。
【選択図】図1
Description
[1]鋼板に溶融亜鉛めっきを施し、さらに加熱処理により合金化し、調質圧延を施した後、酸性溶液に接触させ、接触終了後1〜30秒放置した後、水洗を行うことにより、亜鉛めっき鋼板表面に10nm以上のZn系酸化物層を形成する合金化溶融亜鉛めっき鋼板の製造方法において、前記水洗を、P濃度が0.5〜5000ppmであるP含有水溶液により行うことを特徴とする合金化溶融亜鉛めっき鋼板の製造方法。
[2]前記[1]に記載の合金化溶融亜鉛めっき鋼板の製造方法により生産されるめっき鋼板であり、該めっき鋼板の平坦部表層におけるZnおよびAlを必須成分として含む酸化物層が10nm以上であることを特徴とする合金化溶融亜鉛めっき鋼板。
板厚0.8mmの冷延鋼板上に、常法の合金化溶融亜鉛めっき皮膜を形成し、更に調質圧延を行った。引き続き、図1に示す構成の処理設備を用いて酸化物層を形成した。
(1)プレス成形性評価試験(摩擦係数測定試験)
プレス成形性を評価するために、各供試材の摩擦係数を以下のようにして測定した。
[条件1]
図3に示すビードを用い、押し付け荷重N:400kgf、試料の引き抜き速度(スライドテーブル13の水平移動速度):100cm/minとした。
[条件2]
図4に示すビードを用い、押し付け荷重N:400kgf、試料の引き抜き速度(スライドテーブル13の水平移動速度):20cm/minとした。
(2)化成処理前アルカリ脱脂性評価
各供試体に、防錆油を塗油し、垂直に24時間保持することで塗油量を約2g/m2と一定にした後、化成処理前のアルカリ脱脂液(日本パーカライジング製FC-L4460)に45℃で2分間浸漬した後、スプレー圧:1kg/cm2で30秒間水洗を実施した。その後、供試体を垂直に30秒間保持し、その際の水濡れ率(供試体全面積に対する水ハジキが発生していない面積の割合)を目視で判定した。ここで、完全に脱脂が完了した場合の水濡れ率は100%であり、脱脂不良が生じるに伴い水濡れ率は低下する。
(1)No.1は酸性溶液による処理を行っていないため、平坦部に摺動性を向上させるのに十分な酸化膜が形成されず、摩擦係数が高い。
(2No.2は、酸化物形成処理を行ったが水洗槽5での洗浄は水洗のみを行った比較例であり、No1と比較すると摩擦係数が低くなっており摺動性は向上しているが、アルカリ脱脂後の水濡れ率が非常に低く、アルカリ脱脂性は劣る。
(3)No.3は、比較の為に水酸化ナトリウム水溶液の希釈液で洗浄を行った比較例である。水洗のみで洗浄を行ったNo.2と比較してアルカリ脱脂後の水濡れ率はわずかに向上しているが、完全脱脂ができておらず、希釈によりpHは弱アルカリ領域にあるにもかかわらず水濡れ性はよくない。これは,水酸化ナトリウムのような強アルカリを希釈した液の場合、わずかな酸との反応によりpHが急激に低下するためであり,鋼板表面を弱アルカリ状態に保ちにくいためであると考えられる。
(3)No.4〜10は、二リン酸ナトリウム水溶液で洗浄の処理を行った例である。P濃度が本発明で規定した範囲内にある本発明例(No.5〜9)は摺動性の向上が見られるとともに、アルカリ脱脂後の水濡れ率が全て100%であり、良好なアルカリ脱脂性を示している。一方、P濃度が低濃度側にはずれる比較例(No.4)は、水濡れ率はわずかに向上しているが不十分である。また、P濃度が高濃度側にはずれる比較例(No.10)は、水濡れ率は100%であるものの、酸化膜厚が減少しており、摺動性の向上が不十分である。
(4)No.11〜16は、二リン酸ナトリウム以外のP含有水溶液で洗浄処理を行った本発明例である。摺動性の向上と良好なアルカリ脱脂性を示している。
2 酸性溶液槽
3 絞りロール
4 シャワー水洗装置
5 水洗槽
6 洗浄槽
7 湯洗槽
8 ドライヤ
S 鋼板
11 摩擦係数測定用試料
12 試料台
13 スライドテーブル
14 ローラ
15 スライドテーブル支持台
16 ビード
17 第1ロードセル
18 第2ロードセル
19 レール
N 押付荷重
F 摺動抵抗力
Claims (2)
- 鋼板に溶融亜鉛めっきを施し、さらに加熱処理により合金化し、調質圧延を施した後、酸性溶液に接触させ、接触終了後1〜30秒放置した後、水洗を行うことにより、亜鉛めっき鋼板表面に10nm以上のZn系酸化物層を形成する合金化溶融亜鉛めっき鋼板の製造方法において、前記水洗を、P濃度が0.5〜5000ppmであるP含有水溶液により行うことを特徴とする合金化溶融亜鉛めっき鋼板の製造方法。
- 請求項1に記載の合金化溶融亜鉛めっき鋼板の製造方法により生産されるめっき鋼板であり、該めっき鋼板の平坦部表層におけるZnおよびAlを必須成分として含む酸化物層が10nm以上であることを特徴とする合金化溶融亜鉛めっき鋼板。
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JP2009191317A (ja) * | 2008-02-14 | 2009-08-27 | Sumitomo Metal Ind Ltd | 脱脂性に優れる溶融亜鉛系めっき鋼板の製造方法 |
JP2013007093A (ja) * | 2011-06-24 | 2013-01-10 | Jfe Steel Corp | 化成処理性および耐型かじり性に優れた鋼板の製造方法 |
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