JP2007023337A - 耐食性と耐腐食疲労性に優れた鋼材、及びその表面処理方法 - Google Patents
耐食性と耐腐食疲労性に優れた鋼材、及びその表面処理方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C23C22/07—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 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/20—Orthophosphates containing aluminium cations
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
【解決手段】鋼材の表面に皮膜を有し、該皮膜の平均組成において、Fe,C,Al,P,Oと、選択的に加えられるSi,Mn,Crの合計原子数に対するAl原子数の割合が0.5%以上であり、且つ前記皮膜の平均組成におけるA1原子数が表面処理前の鋼材の平均組成におけるA1原子数より高いことを特徴とする耐食性と耐腐食疲労性に優れた鋼材。
【選択図】 なし
Description
本発明に係る耐食性と耐腐食疲労性に優れた鋼材は、鋼材の表面に皮膜を有し、該皮膜の平均組成において、Fe,C,Al,P,Oと、選択的に加えられるSi,Mn,Crの合計原子数に対するAl原子数の割合が0.5%以上であり、且つ前記皮膜の平均組成におけるA1原子数が表面処理前の鋼材の平均組成におけるA1原子数より高いことを特徴とする。
また、本発明に係る鋼材の表面処理方法は、鋼材の表面に、酸度比の範囲が3.3〜5.7であるAlイオンを含む室温の水溶液を接触させた後水洗し、次いで乾燥を行うことを特徴とする。
図1は本発明に係る表面処理例を示し、図1(A)は後処理として水洗工程1後、乾燥工程2を行う場合の第1の表面処理例を、図1(B)は後処理として第1の乾燥工程2a後、水洗工程1、第2の乾燥工程2bを行う第2の表面処理例を示す。
A1(H2PO4)3(可溶)⇔2H3PO4(液体)+AlPO4(難溶) …(1)
Fe+2H3PO4→Fe(H2PO4)2+H2↑ …(2)
即ち、皮膜の形成は、H3PO4の鋼材腐食作用とA1(H2PO4)3の分解による難溶AlPO4の生成沈着作用に基づくと考えられる。また、AlPO4が生成する際、溶解したFeを含有し、Al,Fe,P,Oから成る膜を形成することも考えられる。したがって、本処理液におけるH3PO4とA1(H2PO4)3のモル濃度比率が本処理条件において重要であり、具体的には酸度比の調整が重要と考えられる。
以下に実施例を示すが、本発明は特に本実施例に限定されるものではない。
直径φ4mm、長さ20〜80mmの鋼材SAE9254(Fe−0.56%C−1.42%Si−0.75%Mn−0.68%Cr)に対し、下記表1に示す条件で表面処理を行った。鋼材は、予めブラスト処理により、表面の強固で厚い酸化スケールを除去した材料を用いた。手順は、まず鋼材を蒸留水にて水洗後、アセトンにより脱脂を行い、その後希塩酸への浸漬により再度脱スケールする前処理を行った。次いで、被処理材を表1に示す条件で本処理液に浸潰させ、その後蒸留水で水洗を行い、自然乾燥させた(表1中の50℃乾燥の欄が無(記号:「−」)の条件)。酸度比の調整は、処理液に水酸化ナトリウム水溶液を添加して行った。また、浸漬後の乾燥は、必要に応じて、50℃に保持した大気雰囲気のオーブン中に放置して行った(表1中の50℃乾燥の欄が有の条件)。
Al原子比率は、EDX装置を用いて表面から5μmまでの領域を元素分析し、ZAF補正により定量分析を行った。評価は、定量分析結果をもとに、Al原子数をA、Fe,C,Al,P,Oと選択的に加えられるSi,Mn,Crの合計原子数をBとした揚合、Bに対するAの比率を算出し、同比率が3%以上であるものを「3以上」、0.5%以上3%未満であるものを「0.5−3」、0.5%未満であるものを「0.5未満」と表示した。
下記表1に結果を示す。比較例1の鋼材は無処理のものであり、耐食性および耐腐食疲労性評価の基準となる。
なお、この発明は、上記実施例のような直径、長さを有した鋼材SAE9254に限定されるものではなく、他の鋼材でも実施段階ではその要旨を逸脱しない範囲で適用可能である。具体的には、少なくともFe,Cを含み、必要に応じてSi,Mn,Crの少なくともいずれか1つ以上が任意に加えられる鋼材全てに適用できる。又、表面処理条件(例えば、浴温、浸漬時間)も上記実施例に記載されたものに限らず、本発明の要旨を変更しない範囲で適宜組み合わせることができる。
Claims (10)
- 鋼材の表面に皮膜を有し、該皮膜の平均組成において、Fe,C,Al,P,Oと、選択的に加えられるSi,Mn,Crの合計原子数に対するAl原子数の割合が0.5%以上であり、且つ前記皮膜の平均組成におけるA1原子数が表面処理前の鋼材の平均組成におけるA1原子数より高いことを特徴とする耐食性と耐腐食疲労性に優れた鋼材。
- 鋼材の表面に皮膜を有し、前記鋼材の表面から5μmまでの深さの領域における平均組成において、Fe,C,Al,P,Oと、選択的に加えられるSi,Mn,Crの合計原子数に対するAl原子数の割合が0.5%以上であり、且つ前記皮膜の平均組成におけるA1原子数が表面処理前の鋼材の平均組成におけるA1原子数より高いことを特徴とする耐食性と耐腐食疲労性に優れた鋼材。
- Fe,C,Al,P,Oと、選択的に加えられるSi,Mn,Crの合計原子数に対するAl原子数の割合が3%以上であることを特徴とする請求項2記載の耐食性と耐腐食疲労性に優れた鋼材。
- 鋼材の表面に、酸度比の範囲が3.3〜5.7であるAlイオンを含む室温の水溶液を接触させた後水洗し、次いで乾燥を行うことを特徴とする鋼材の表面処理方法。
- 鋼材の表面に、酸度比の範囲が3.3〜5.7であるAlイオンを含む室温の水溶液を接触させた後乾燥し、次いで水洗後再度乾燥することを特徴とする鋼材の表面処理方法。
- Alイオンを含む40〜50℃の水溶液を30秒以上接触させることを特徴とする請求項4または5に記載の鋼材の表面処理方法。
- Alイオンを含む30℃の水溶液を180秒以上接触させることを特徴とする請求項4または5に記載の鋼材の表面処理方法。
- Alイオンを含む室温の水溶液と接触させた後、水洗前に行う乾燥を50℃以下で行うことを特徴とする請求項5に記載の鋼材の表面処理方法。
- Alイオンを含む水溶液の酸度比の範囲が3.8〜5.4であることを特徴とする請求項4〜8のいずれかに記載の鋼材の表面処理方法。
- りん酸アルミニウムの重量濃度の範囲が1〜10%の水溶液で、酸度比の範囲が3.8〜5.4としたものを表面処理液とする請求項4〜8のいずれかに記載の鋼材の表面処理方法。
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JP2005206977A JP5153063B2 (ja) | 2005-07-15 | 2005-07-15 | 鋼材の表面処理方法 |
US11/484,988 US20070012382A1 (en) | 2005-07-15 | 2006-07-11 | Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor |
ES06014476T ES2387395T3 (es) | 2005-07-15 | 2006-07-12 | Producto de acero excelente en la resistencia a la corrosión y la resistencia a la fatiga por corrosión y método de tratamiento de superficie para el mismo |
EP06014476A EP1743955B1 (en) | 2005-07-15 | 2006-07-12 | Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor |
KR1020060065909A KR101285969B1 (ko) | 2005-07-15 | 2006-07-13 | 내식성 및 내부식 피로성이 우수한 강재 및 이의 표면 처리 방법 |
CN2006101059205A CN1924097B (zh) | 2005-07-15 | 2006-07-14 | 耐腐蚀性和耐腐蚀疲劳性极佳的钢材及其表面处理方法 |
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CN101634022A (zh) * | 2008-07-24 | 2010-01-27 | 中国第一汽车集团公司 | 车载scr封装用铁素体不锈钢的耐腐蚀钝化处理工艺 |
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- 2006-07-12 EP EP06014476A patent/EP1743955B1/en not_active Expired - Fee Related
- 2006-07-12 ES ES06014476T patent/ES2387395T3/es active Active
- 2006-07-13 KR KR1020060065909A patent/KR101285969B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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EP1743955A2 (en) | 2007-01-17 |
KR20070009446A (ko) | 2007-01-18 |
CN1924097A (zh) | 2007-03-07 |
ES2387395T3 (es) | 2012-09-21 |
EP1743955A3 (en) | 2007-01-24 |
JP5153063B2 (ja) | 2013-02-27 |
CN1924097B (zh) | 2011-02-23 |
US20070012382A1 (en) | 2007-01-18 |
EP1743955B1 (en) | 2012-05-02 |
KR101285969B1 (ko) | 2013-07-12 |
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