碳钢在高温高CO2分压环境中的点蚀发展机制
Pitting Development Mechanism of Carbon Steel at High Temperature and High Partial Pressure of CO2
摘 要
利用SEM、EDS和激光共聚焦显微镜对N80钢不同腐蚀阶段表面腐蚀产物膜形貌和成分进行观察和分析，研究了其在高温高CO2分压环境中的点蚀发展机制。结果表明: 在高温、高CO2分压环境中，低合金钢点蚀坑的形成和发展与腐蚀产物膜的破坏有关，同时也和Cl-的催化机制有关。
高温高CO2分压
点蚀
发展机制
carbon steel
high temperature and high partial pressure of CO2
pitting
development mechanism
Abstract
Carbon steel specimens at different pitting propagation stages were chosen to explore the development mechanism of pitting at high temperature and high partial pressure of CO2. The morphology and composition of the corrosion product film were observed and analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) and confocal laser microscopy. The results show that the initiation and growth of pitting in carbon steel were correlated with the destruction of corrosion scale and the catalytic mechanism of Cl-.
中图分类号 TG174.2 DOI 10.11973/fsyfh-201602003
所属栏目 试验研究
基金项目 国家自然科学基金(51371034)
收稿日期 2015/5/5
修改稿日期
网络出版日期
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备注张雷(1978-),副教授,博士,从事H2S/CO2腐蚀及耐蚀材料研究,
引用该论文: CHEN Ying-feng,SHI Feng-xian,LI Hui-xin,ZHANG Lei,LI Da-peng,LU Min-xu. Pitting Development Mechanism of Carbon Steel at High Temperature and High Partial Pressure of CO2[J]. Corrosion & Protection, 2016, 37(2): 104
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参考文献
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【6】SUN Y H,NESIC S. A parametric study and modeling on localized CO2 corrosion in horizontal wet gas flow[C]//Proceedings of the Corrosion 2004. New Orleans:NACE,2004:04380.
【7】HAN J B,YANG Y,BROWN B,et al. Electrochemical investigation of localized CO2 corrosion on mild steel[C]//Proceedings of the Corrosion 2007. Nashville:NACE,2007:07323.
【8】HAN J B,YANG Y,NESIC S,et al. Roles of passivation and galvanic effects in localized CO2 corrosion of mild-steel[C]//Proceedings of the Corrosion 2008. New Orleans:NACE,2008:08332.
【9】陈长风,路民旭,赵国仙,等. N80油管钢CO2腐蚀点蚀行为[J]. 中国腐蚀与防护学报,2003,23(1):21-25.
【10】CHOIR H J,CEPULIS R L,LEE J B. Understanding localized corrosion of carbon steel from physical properties of iron carbonate scales[J]. Corrosion,1988,89(10):209-214.
【11】HUNNIK E W J,POTS B F M,HENDRIKSEN E L J A. The formation of protective FeCO3 corrosion product layers in CO2 corrosion[C]//Proceedings of the Corrosion 1996. San Diego:NACE,1996:6.
【12】刘智勇,董超芳,贾志军,等. X70钢在模拟潮湿存储环境中的点蚀行为[J]. 金属学报,2011,47(8):1009-1016.
【13】李谋成,林海潮,曹楚南,等. 碳钢在土壤中腐蚀的电化学阻抗谱特征[J]. 中国腐蚀与防护报,2000,20(2):111-117.
【14】PICKERING H W. The significance of the local electrode potential within pits,crevices and cracks[J]. Corrosion Science,1989,29(2/3):325-341.
【15】LI W S,CUI N,LUO J L. Pitting initiation and propagation of hypoeutectoid iron-based alloy with inclusions of martensite in chloride-containing nitrite solutions[J]. Electrochimica Acta,2004,49(9/10):1663-1672.
【16】SATO N. Toward a more fundamental understanding of corrosion processes[J]. Corrosion,1989,45(5):354-368.
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