| X70钢在模拟潮湿存储环境中的点蚀行为 |
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| 引用本文： | 刘智勇,董超芳,贾志军,李晓刚.X70钢在模拟潮湿存储环境中的点蚀行为[J].金属学报,2011(8). |
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| 作者姓名： | 刘智勇 董超芳 贾志军 李晓刚 |
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| 作者单位： | 北京科技大学腐蚀与防护中心腐蚀与防护教育部重点实验室;南昌航空大学材料科学与工程学院; |
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| 基金项目： | 国家自然科学基金项目50901041; 中国博士后科学基金项目20100480196资助~~ |
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| 摘 要： | 应用电化学极化技术、电化学阻抗谱、模拟浸泡实验,研究了X70钢在模拟潮湿存储环境中点蚀的发生机制及规律.结果表明,X70钢在模拟潮湿存储环境中可以发生点蚀,导致点蚀发生的腐蚀介质来自于层流冷却水中的腐蚀性物质,其中HCO_3~-和NO_3~-是致钝剂,而Cl~-和SO_4~(2-)可破坏钝化膜,促进点蚀发生.在0.5 mol/L的NaHCO_3介质中当Cl~-浓度达到0.02 mol/L时钝化膜即失去保护性.Cl~-浓度是影响点蚀的萌生和发展的关键因素,当其浓度较低时点蚀容易形核,但仅有少数能够长大;而当其浓度适中(约0.149 mol/L)时点蚀敏感性最高,点蚀容易长大;当其浓度过高时发生均匀腐蚀,点蚀难以长大.
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| 关 键 词： | X70管线钢 点蚀 潮湿存储环境 |
PITTING CORROSION OF X70 PIPELINE STEEL IN THE SIMULATED WET STORAGE ENVIRONMENT |
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| LIU Zhiyong,DONG Chaofang,JIA Zhijun,LI Xiaogang Corrosion , Protection Center University of Science , Technology Beijing,Key Laboratory of Corrosion , Protection of Ministry of Education,Beijing School of Material Science , Technology,Nanchang Hangkong University,Nanchang.PITTING CORROSION OF X70 PIPELINE STEEL IN THE SIMULATED WET STORAGE ENVIRONMENT[J].Acta Metallurgica Sinica,2011(8). |
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| Authors: | LIU Zhiyong DONG Chaofang JIA Zhijun LI Xiaogang Corrosion Protection Center University of Science Technology Beijing Key Laboratory of Corrosion Protection of Ministry of Education Beijing School of Material Science Technology Nanchang Hangkong University Nanchang |
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| Affiliation: | LIU Zhiyong~(1,2),DONG Chaofang~1,JIA Zhijun~1,LI Xiaogang~1 1) Corrosion and Protection Center University of Science and Technology Beijing,Key Laboratory of Corrosion and Protection of Ministry of Education,Beijing 100083 2) School of Material Science and Technology,Nanchang Hangkong University,Nanchang 330063 |
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| Abstract: | Pitting mechanism and behaviour of X70 pipeline steel in humid storage environments were investigated using electrochemical polarization curves,electrochemical impedance spectrums (EIS),immersing corrosion tests and corrosion morphology observation through SEM.It was demonstrated that pitting of X70 pipeline steel occurred in simulated moist storage environments,for which the corrosive substances came from the residual species in laminar cooling water introduced during steel manufacture processes.HCO_3~- an... |
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| Keywords: | X70 pipeline steel pitting wet storage environment |
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