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D0I:10.13374/i.issnl00I053.2009.12.00U7 第31卷第12期 北京科技大学学报 Vol.31 No.12 2009年12月 Journal of University of Science and Technology Beijing Dee.2009 卷曲后供氧差异对热轧带钢氧化皮组织及耐蚀性的影 响 顾其德) 董超芳李晓刚)齐慧滨)肖葵)骆鸿) 1)北京科技大学腐蚀与防护中心,北京1000832)宝钢技术研究院焊接与表面技术研究所,上海201900 摘要采用扫描电子显微镜(SEM)、X射线衍射仪、盐雾实验和电化学极化方法,研究了SS4O0热轧带钢沿宽度方向不同位 置氧化皮的组织、结构及其耐蚀性.结果表明,SS4O0边部取样位置的氧化皮厚度最厚且比较均匀,结构致密,存在明显的 Fe304/Fe共析组织.SS400边部和板宽1/4处的成分主要为Fe304,Fe203和Fe,板宽中心位置的成分主要为Fe304和Fe.盐 雾腐蚀实验表明,SS400边部腐蚀最轻,板宽1/4处次之,板宽中心位置腐蚀最为严重:动电位极化曲线测试结果显示,SS400 边部的腐蚀电位明显高于其他两个位置,腐蚀电流最小·热轧带钢在卷曲后,由于带钢沿宽度方向不同位置的供氧差异,会导 致氧化皮组织、结构的显著不同,进而影响氧化皮的耐蚀性· 关键词热轧带钢:氧化皮:组织结构:耐蚀性 分类号TG172.3:TE980.43 Corrosion behavior and structure of oxide scales formed on hot rolled strips after coiling with different oxygen supplies GU Qi-de),DONG Chao-fang,LI Xiao-gang),QI Hui-bin).XIAO Kui).LUO Hong) 1)Corrosion Protection Center.University of Science and Technology Beijing.Beijing 100083.China 2)Institute of Welding and Surface Technology Baoshan Iron and Steel Institute of Technology Shanghai 201900,China ABSTRACT The structure of oxide scales and corrosion resistance of SS400 hot-rolled strips at different positions in plate width were studied by scanning electron microscopy (SEM).X-ray diffraction quantitative analysis.salt spray test and electrochemical methods. The results show that oxide scales at the plate edge are the thickest,relatively uniform and compact,and there is obvious magnetite/ iron eutectoid in them.Oxide scales at the edge and one-fourth of plate width mainly consist of magnetite,hematite and magnetite- iron eutectoid,but oxide scales at the center are composed of magnetite and iron.It is shown by salt spray corrosion test that the cor- rosion rate is the minimum at the edge.the second at one-fourth of plate width.and the most serious at the center.By potentiodyna- mic polarization curve test.the corrosion potential at the edge is bigger than those at the two ot her parts.and the current is the mini- mum.After the hot rolled strips being coiled.the difference in oxygen supply in the width direction leads different structures of oxide scales.which influence the corrosion resistance of oxide scales. KEY WORDS hot rolled strip:oxide scale:microstructure:corrosion behavior 热轧带钢卷曲后,由于钢卷的热容量大,冷却速 速度,例如,对于碳钢在空气中氧化,927℃的临界 率非常慢,在有缝隙的边缘部位,热轧带钢不可避 流速是2.7cms1,1150℃是4.2cms1. 免的拱起、平整性差以及存在的边缘损耗导致供氧 王银军等)采用扫描电子显微镜和电子背散 容易;在钢卷的中心部位,供氧受到限制或被阻止, 射技术对卷曲后的热轧带钢氧化皮进行显微分析, 通常认为,钢在特定气体种类(空气、氧气或水蒸气) 直接标定出氧化皮中不同物相.张孟仪等3]研究了 中和在给定温度下的氧化存在着一个临界气体流动 热轧板的氧化皮结构对酸洗效果的影响,指出具有 收稿日期:2009-04-15 基金项目:国家基础条件平台建设资助项目(N。,2005DKA10400) 作者简介:顾其德(1982-),男,硕士研究生;董超芳(1976-),女,副教授,博士,E-mail:dongchf@ina:com卷曲后供氧差异对热轧带钢氧化皮组织及耐蚀性的影 响 顾其德1) 董超芳1) 李晓刚1) 齐慧滨2) 肖 葵1) 骆 鸿1) 1) 北京科技大学腐蚀与防护中心‚北京100083 2) 宝钢技术研究院焊接与表面技术研究所‚上海201900 摘 要 采用扫描电子显微镜(SEM)、X 射线衍射仪、盐雾实验和电化学极化方法‚研究了 SS400热轧带钢沿宽度方向不同位 置氧化皮的组织、结构及其耐蚀性.结果表明‚SS400边部取样位置的氧化皮厚度最厚且比较均匀‚结构致密‚存在明显的 Fe3O4/Fe 共析组织.SS400边部和板宽1/4处的成分主要为 Fe3O4、Fe2O3 和 Fe‚板宽中心位置的成分主要为 Fe3O4 和 Fe.盐 雾腐蚀实验表明‚SS400边部腐蚀最轻‚板宽1/4处次之‚板宽中心位置腐蚀最为严重.动电位极化曲线测试结果显示‚SS400 边部的腐蚀电位明显高于其他两个位置‚腐蚀电流最小.热轧带钢在卷曲后‚由于带钢沿宽度方向不同位置的供氧差异‚会导 致氧化皮组织、结构的显著不同‚进而影响氧化皮的耐蚀性. 关键词 热轧带钢;氧化皮;组织结构;耐蚀性 分类号 TG172∙3;T E980∙43 Corrosion behavior and structure of oxide scales formed on hot rolled strips after coiling with different oxygen supplies GU Q-i de 1)‚DONG Chao-f ang 1)‚LI Xiao-gang 1)‚QI Hu-i bin 2)‚XIA O Kui 1)‚LUO Hong 1) 1) Corrosion & Protection Center‚University of Science and Technology Beijing‚Beijing100083‚China 2) Institute of Welding and Surface Technology‚Baoshan Iron and Steel Institute of Technology‚Shanghai201900‚China ABSTRACT T he structure of oxide scales and corrosion resistance of SS400hot-rolled strips at different positions in plate width were studied by scanning electron microscopy (SEM)‚X-ray diffraction quantitative analysis‚salt spray test and electrochemical methods. T he results show that oxide scales at the plate edge are the thickest‚relatively uniform and compact‚and there is obvious magnetite/ iron eutectoid in them.Oxide scales at the edge and one-fourth of plate width mainly consist of magnetite‚hematite and magnetite￾iron eutectoid‚but oxide scales at the center are composed of magnetite and iron.It is shown by salt spray corrosion test that the cor￾rosion rate is the minimum at the edge‚the second at one-fourth of plate width‚and the most serious at the center.By potentiodyna￾mic polarization curve test‚the corrosion potential at the edge is bigger than those at the two other parts‚and the current is the mini￾mum.After the hot rolled strips being coiled‚the difference in oxygen supply in the width direction leads different structures of oxide scales‚which influence the corrosion resistance of oxide scales. KEY WORDS hot rolled strip;oxide scale;microstructure;corrosion behavior 收稿日期:2009-04-15 基金项目:国家基础条件平台建设资助项目(No.2005DKA10400) 作者简介:顾其德(1982—)‚男‚硕士研究生;董超芳(1976—)‚女‚副教授‚博士‚E-mail:dongchf@sina.com 热轧带钢卷曲后‚由于钢卷的热容量大‚冷却速 率非常慢.在有缝隙的边缘部位‚热轧带钢不可避 免的拱起、平整性差以及存在的边缘损耗导致供氧 容易;在钢卷的中心部位‚供氧受到限制或被阻止. 通常认为‚钢在特定气体种类(空气、氧气或水蒸气) 中和在给定温度下的氧化存在着一个临界气体流动 速度.例如‚对于碳钢在空气中氧化‚927℃的临界 流速是2∙7cm·s —1‚1150℃是4∙2cm·s —1[1]. 王银军等[2] 采用扫描电子显微镜和电子背散 射技术对卷曲后的热轧带钢氧化皮进行显微分析‚ 直接标定出氧化皮中不同物相.张孟仪等[3]研究了 热轧板的氧化皮结构对酸洗效果的影响‚指出具有 第31卷 第12期 2009年 12月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol.31No.12 Dec.2009 DOI:10.13374/j.issn1001-053x.2009.12.007
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