JP5230428B2 - 優れた耐食性・塗料密着性を有するSn系めっき鋼板用水系処理液および表面処理鋼板の製造方法 - Google Patents
優れた耐食性・塗料密着性を有するSn系めっき鋼板用水系処理液および表面処理鋼板の製造方法 Download PDFInfo
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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
- 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
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- C—CHEMISTRY; METALLURGY
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Description
本発明の水系処理液は、有機物(A)、水溶性クロム化合物(B)、水分散性シリカ(C)と水を含有し、pHが1.0〜6.0である。有機物(A)は、アスコルビン酸およびその誘導体の少なくとも1種である。アスコルビン酸はヒドロキシル基/カルボキシル基の比が5/1である。ヒドロキシル基/カルボキシル基の比が小さいと、Snとの配位結合量低下や、耐アルカリ溶出性劣化に伴い塗料密着性が悪化する。ヒドロキシル基/カルボキシル基の比が大きすぎるとSnとの配位結合量が低下することにより塗料密着性が悪化するとともに、水系処理液がゲル化したり、粘度が高くなることにより鋼板表面への塗布性が劣化するため、好ましくない。
本発明の有機物(A)は、以下のような効果が期待できることが、発明者らの詳細な検討により明らかになった。まず、処理液としての液安定性に寄与する。アスコルビン酸およびその誘導体は、少なくとも一対のカルボキシル基とヒドロキシル基で3価のクロムイオンに強力に配位し、残りのヒドロキシル基が親水性を示すため、経時での液中3価クロムイオンの自己縮合反応を抑制し、処理液の安定性を高めることが出来る。また、アスコルビン酸およびその誘導体は、少なくとも一対のカルボキシル基とヒドロキシル基でめっき表面のSnに対しても選択的に強力に配位するため、Sn系めっき鋼板に塗布・乾燥後は、めっき表面との強固な密着性を発現させることができる。加えて3価クロム、シリカとも複合的に架橋して高分子化しつつ皮膜を形成することで皮膜耐食性や塗料との結合強化による塗料密着性も向上する。
(1)供試材
溶融Sn系めっき鋼板の作製
表1に示す成分の鋼を通常の転炉−真空脱ガス処理により溶製し、鋼片とした後、通常の条件で熱間圧延、冷間圧延、連続焼鈍工程を行い、焼鈍鋼板(板厚0.8mm)を得た。この鋼板の一部にFe-Niめっきを0.2g/m2 施した後、フラックス法でSn系めっきを行った。Fe−Ni合金めっき浴はNiめっきのワット浴に対して、硫酸鉄を30〜200g/L添加したものを使用した。フラックスはZnCl2 水溶液をロール塗布して使用し、めっき浴のZnの組成は0〜20wt%まで変化させた。浴温は280℃とし、めっき後ガスワイピングによりめっき付着量を調整した。こうして製造しためっき鋼板を種々の粗度を有するロールで調質圧延して表面粗度を調節した。
溶融Sn系めっき鋼板の作製例と同様に、表1に示す成分の鋼を通常の転炉-真空脱ガス処理により溶製し、鋼片とした後、通常の条件で熱間圧延し、10%塩酸中で酸洗した後,冷間圧延して板厚0.8mmの冷延鋼板とした。この冷延鋼板を,連続溶融めっき設備を用い,均熱温度800℃,均熱時間20秒で焼鈍し,冷却速度20℃/秒で465℃まで冷却した後,浴温460℃のZn−0.2%Alめっき浴に3秒浸漬し,ワイピングで付着量が40〜50g/m2となるように調整した。
上記で準備した各供試材をシリケート系のアルカリ脱脂剤のファインクリーナー4336(登録商標:日本パーカライジング(株)製)で脱脂処理(濃度20g/L、温度60℃、20秒間スプレー)した後、水道水で洗浄した。
表2に有機物を、表3に水溶性クロム化合物を、表4には水分散性シリカを、表5にはりん酸およびその化合物を、表6には硝酸金属塩を示す。表7に示した実施例No.4〜33、比較例No.34〜49(比較例No.42〜43は除く)は、実質的に6価クロムを含まない事を確認している。また、30%還元クロムとは、無水クロム酸を純水に溶解し、メタノールを加えて6価クロムの30%を還元したものである。また、100%還元クロムとは、この30%還元クロムに、表7に示す組成になるようにそれぞれを加え(水分散性シリカはあとで加える)、硝酸とアンモニア水でpHを調整して、6価クロムが検出されなくなるまで、ヒドラジン一水和物(NH2NH2・H2O)を加えたものである。
上記にて調整した各表面処理液をバーコーターにて上記各試験板上に塗布し、240℃の雰囲気温度で乾燥した。なお、付着量の調整は表面処理液の固形分濃度を適宜調整することによって行い、Crの付着量(mg/m2)測定は蛍光X線分析でΦ30mmエリアの平均値を採用した。
(1)耐食性試験(平面部耐食試験)
JIS−Z−2371による塩水噴霧試験を1000時間実施し、赤錆発生面積を観察し、下記基準により評価を行った。
◎:赤錆発生面積率が全面積の3%未満
○:赤錆発生面積率が全面積の3%以上10%未満
△:赤錆発生面積率が全面積の10%以上30%未満
×:赤錆発生面積率が全面積の30%以上
下記に示す溶接性条件でスポット溶接を行い、ナゲット系が4√tを切った時点までの連続打点数を評価した。
電極:ドーム型電極、先端径6mm
溶接電流:チリ発生電流値の95%
加圧力:200kg
予備加圧:50サイクル
通電:10サイクル
ホールド:3サイクル
◎:連続打点300点超
○:連続打点200〜300点
△:連続打点100〜200点
×:連続打点100点未満
試験片にバーコーターを用いてフタル酸樹脂系塗料を塗布し、120℃で20分間加熱乾燥して20μmの乾燥膜厚を得た。続いて、沸騰水中に30分浸漬し、取り出した後に24時間自然放置した。その後、カッターナイフを用いて1mm、100マスの碁盤目加工を施し、テープ剥離試験により、塗膜残存数を求めた。塗装密着性の評価基準を以下に示す。試験の個体数は2で行った。
◎:残存個数100個
○:残存個数98以上100個未満
△:残存個数50個以上98個未満
×:残存個数50個未満
各水系処理液を密封状態で30℃に保持した。処理液安定性の評価基準を以下に示す。
〔評価基準〕
◎:5日間以上ゲル化なし
○:24時間以上〜5日間未満ゲル化なし
△:1時間以上〜24時間未満ゲル化なし
×:1時間未満でゲル化
各水系処理液にZn換算で2g/Lの炭酸亜鉛を添加し、40℃1週間密封で保持した。処理液にゲル化や沈殿物が認められなかったものを記号○で、認められたものを×で評価した。
シリケート系のアルカリ脱脂剤のファインクリーナー4336(登録商標:日本パーカライジング(株)製)で脱脂処理(濃度20g/L、温度60℃、20秒間スプレー)した後、水道水で洗浄し、80℃雰囲気のオーブンで10分間乾燥した。脱脂前後のCr付着量をXRFにて測定し、脱脂後Cr付着量/脱脂前Cr付着量からCr固定率を算出した。Cr固定率の評価基準を以下に示す。
◎:固定率98〜100%
○:固定率90〜98%
△:固定率50〜90%
×:固定率50%未満
Claims (5)
- 有機物(A)、水溶性クロム化合物(B)、水分散性シリカ(C)と水を含有し、有機物(A)がアスコルビン酸およびその誘導体の少なくとも1種であり、水溶性クロム化合物B)には6価クロムを含まず、分散性シリカ(C)が、球状と鎖状の少なくとも2種類以上から成り、そのSiO 2 重量比率が、鎖状シリカ/球状シリカ=2/8〜8/2であり、pHが1.0〜6.0であることを特徴とするSn系めっき鋼板用水系処理液。
- 追加成分としてりん酸および/またはりん酸化合物(D)を含有し、本発明の処理液中のCrとりん酸および/またはりん酸化合物(D)中のPO4の質量比がPO4/Cr=1/1〜3/1の範囲であることを特徴とする請求項1に記載のSn系めっき鋼板用水系処理液。
- 追加成分として金属塩(E)を含有し、かつ金属がMg、Ca、Ba、Sr、Co、Ni、Zr、W、Moからなる群から選ばれる少なくとも1種であり、金属とCrとの重量比が金属/Cr=0.01/1〜0.5/1の範囲であることを特徴とする請求項1又は2に記載のSn系めっき鋼板用水系処理液。
- 1〜8.8質量%のZnと91.2〜99.0質量%のSnからなるSn系めっき層を形成した鋼板に請求項1〜3のいずれか1項に記載の水系処理液を塗布、乾燥させることを特徴とする優れた耐食性、塗料密着性を有するSn系めっき鋼板の製造方法。
- 請求項4において、塗布、乾燥した乾燥皮膜付着量が該Sn系めっき鋼板の片面当りの金属クロム換算で3〜100mg/m2であることを特徴とする優れた耐食性、塗料密着性を有するSn系めっき鋼板の製造方法。
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JP2008533222A JP5230428B2 (ja) | 2006-09-07 | 2007-09-06 | 優れた耐食性・塗料密着性を有するSn系めっき鋼板用水系処理液および表面処理鋼板の製造方法 |
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CN103205741B (zh) * | 2012-01-13 | 2016-01-20 | 苏州汉扬精密电子有限公司 | 镁合金钝化液及镁合金表面处理方法 |
DE102012102082B3 (de) * | 2012-03-13 | 2013-03-21 | Thyssenkrupp Rasselstein Gmbh | Verfahren zur Behandlung eines mit einer Metallbeschichtung versehenen Stahlbands oder -blechs mit einem Nachbehandlungsmittel sowie ein mit einer Metallbeschichtung versehenes Stahlband oder -blech. |
JP2013249528A (ja) * | 2012-06-04 | 2013-12-12 | Dipsol Chemicals Co Ltd | アルミ変性コロイダルシリカを含有した3価クロム化成処理液 |
JP6206112B2 (ja) * | 2013-11-19 | 2017-10-04 | 新日鐵住金株式会社 | Sn系めっき鋼板及び水系処理液 |
WO2015089072A1 (en) | 2013-12-09 | 2015-06-18 | Angus Chemical Company | Low voc isoxazolidine as open time extenders in water borne paints |
JP6265050B2 (ja) * | 2014-05-28 | 2018-01-24 | 新日鐵住金株式会社 | 優れた耐食性と塗料密着性を有する溶融Sn−Znめっき鋼板とその製造方法 |
ES2790576T3 (es) * | 2014-09-24 | 2020-10-28 | Canon Kk | Medio de impresión |
JP6601283B2 (ja) * | 2016-03-10 | 2019-11-06 | 日本製鉄株式会社 | 燃料タンク |
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JP6868313B1 (ja) * | 2020-09-04 | 2021-05-12 | ユケン工業株式会社 | 反応型化成処理液および防錆部材の製造方法 |
CN115247263A (zh) * | 2022-06-20 | 2022-10-28 | 上海兴赛尔表面材料有限公司 | 一种镀锡板用环保型钝化组合物及其制备方法和应用 |
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Also Published As
Publication number | Publication date |
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RU2009112585A (ru) | 2010-10-20 |
BRPI0716246B1 (pt) | 2018-03-06 |
EP2060660B1 (en) | 2015-02-25 |
CN101512045A (zh) | 2009-08-19 |
CA2662611C (en) | 2013-02-19 |
JPWO2008029953A1 (ja) | 2010-01-21 |
KR20090048495A (ko) | 2009-05-13 |
US8097306B2 (en) | 2012-01-17 |
CA2662611A1 (en) | 2008-03-13 |
EP2060660A4 (en) | 2012-02-01 |
RU2417276C2 (ru) | 2011-04-27 |
WO2008029953A1 (en) | 2008-03-13 |
BRPI0716246A2 (pt) | 2013-09-03 |
CN101512045B (zh) | 2011-08-17 |
KR101120230B1 (ko) | 2012-03-16 |
MX2009002399A (es) | 2009-03-20 |
EP2060660A1 (en) | 2009-05-20 |
US20100239773A1 (en) | 2010-09-23 |
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