| X70管线钢在CO2-3/HCO-3体系中表面膜性能研究 |
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| 引用本文： | 胡钢,许淳淳.X70管线钢在CO2-3/HCO-3体系中表面膜性能研究[J].中国化学工程学报,2005,13(2). |
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| 作者姓名： | 胡钢 许淳淳 |
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| 作者单位： | 胡钢,HU Gang(College of Materials Science and ngineering,Beijing University of Chemical Technology,Beijing 100029,China);许淳淳,Xu Chunchun(College of Materials Science and ngineering,Beijing University of Chemical Technology,Beijing 100029,China;The State key Laboratory for Metallic Corrosion and Protection,Shenyang 110015,China) |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： |
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Properties of Surface Film on XT0 Pipeline Steel in CO2-3/HCO-3 Environment |
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| HU Gang,Xu Chunchun.Properties of Surface Film on XT0 Pipeline Steel in CO2-3/HCO-3 Environment[J].Chinese Journal of Chemical Engineering,2005,13(2). |
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| Authors: | HU Gang Xu Chunchun |
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| Affiliation: | College of Materials Science and ngineering,Beijing University of Chemical Technology,Beijing 100029,China;College of Materials Science and ngineering,Beijing University of Chemical Technology,Beijing 100029,China;The State key Laboratory for Metallic Corrosion and Protection,Shenyang 110015,China |
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| Abstract: | The electrochemical behavior of X70 pipeline steel in (0.5 mol· L-1 Na2CO3+1 mol· L-1 NaHCO3)solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to analyze the composition and microstructure of the surface film. The results showed that there were two anodic peaks at -600 mV and -350 mV.The surface film formed at -600 mV mainly consisted of ferrous carbonates and ferrous hydroxycarbonates. It had a small reaction resistance. It was metastable and possessed poor protective property. Numerous pits and microcracks existed on the film, which could be the active paths for the initiation of stress corrosion cracking. The surface film formed at -350 mV, mainly consisted of ferric oxides. It has high reaction resistance and offered good protection for the substrate. |
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| Keywords: | X70 pipeline steel surface film electrochemical impedance spectroscopy X-ray photoelectron spectroscopy scanning electron microscopy |
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