Long-term evolution of the corrosion product film on N80 casing steel in a simulated carbon sequestration environment

ZHANG Wei; ZHAO Zehui; MIN Pengrui; WANG Weibin; OUYANG Xin; WU Chunsheng; WANG Yingwei; PAN Jie; JU Hui; ZHANG Chunxia; XIANG Yong

doi:10.11949/0438-1157.20260591

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Long-term evolution of the corrosion product film on N80 casing steel in a simulated carbon sequestration environment

更新时间：2026-07-01

- Long-term evolution of the corrosion product film on N80 casing steel in a simulated carbon sequestration environment
- CIESC Journal (2026)
- 作者机构：
  
  1.中国石油大学（北京）低碳能源装备与材料保护实验室，北京 102249
  2.国家管网集团科学技术研究总院分公司，天津 300457
  3.中国石油长庆油田分公司油气工艺研究院，陕西西安 710018
  4.中国石化石油工程设计有限公司，山东东营 257026
  5.湖南纳菲尔新材料科技股份有限公司，湖南长沙 410000
  6.宝山钢铁股份有限公司中央研究院，上海 201999
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260591
  CLC： TE 822
- Received：27 April 2026，
  
  Revised：2026-07-01，
  
  Accepted：01 July 2026，
- 稿件说明：
移动端阅览
ZHANG Wei, ZHAO Zehui, MIN Pengrui, et al. Long-term evolution of the corrosion product film on N80 casing steel in a simulated carbon sequestration environment[J/OL]. CIESC Journal, 2026.
DOI：

ZHANG Wei, ZHAO Zehui, MIN Pengrui, et al. Long-term evolution of the corrosion product film on N80 casing steel in a simulated carbon sequestration environment[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260591.

摘要

腐蚀是碳封存安全的主要威胁之一，其腐蚀产物膜结构与成分的演化将直接影响套管钢的耐腐蚀性。本研究针对N80套管钢在80℃、

(CO

) 0.53 bar的地层水环境中开展24~1440小时的不同周期腐蚀实验，通过失重法、电化学阻抗谱（EIS）、动电位极化及一系列微观表征方法：扫描电镜（SEM）、X射线衍射仪（XRD）、能谱仪（EDS）、激光共聚焦显微镜，揭示产物膜动态演化规律与机制。结果表明，第一阶段（24 h）为晶体少量形核期，产物以Fe

C为骨架形核、生长；第二阶段（24~168 h）为晶体大量形核生长期，产物膜致密化，腐蚀速率急剧下降；第三阶段（168~360 h）为外层产物膜生长期，外层膜以较低过饱和度形成晶粒尺寸较大、疏松结构；第四阶段（360~1440 h）为双层产物膜时期，外层膜在720~1080 h出现溶解现象，至1440 h内膜层电阻升高、致密性增加。本研究揭示产物膜在碳封存环境中的内在生长机制，为深入理解封存井筒的长期完整性演化过程提供参考。

Abstract

corrosion is one of the main threats to the safety of carbon sequestration

and the evolution of the corrosion product film directly affects the corrosion resistance of casing steel through changes in its structure and composition. This study conducted 24 to 1440 hours corrosion experiments on N80 casing steel in a formation water environment at 80 °C and with a

(CO

) of 0.53 bar. Using mass-loss measurements

electrochemical impedance spectroscopy (EIS)

potentiodynamic polarization

and multiple microstructural characterization methods —scanning electron microscopy (SEM)

X-ray diffraction (XRD)

energy-dispersive X-ray spectroscopy (EDS)

and laser scanning confocal microsco

py— the dynamic evolution law and mechanism of the corrosion product film were systematically revealed. The results showed a four-stage evolution process. Stage 1 (24 h)

limited nucleation of the crystals occurred

in which they preferentially nucleated and grew upon the Fe

C network. Stage 2 (24-168 h) was characterized by extensive nucleation and growth of crystals

during which the product film densified and the corrosion rate decreased sharply. Stage 3 (168-360 h) was a period of outer product film growth

where the outer layer formed with larger grain size and a looser structure under relatively low supersaturation. Stage 4 (360-1440 h) represented the period of the bilayer product film

where the outer layer showed dissolution between 720 and 1080 h

and by 1440 h

the resistance of the inner layer increased indicating enhanced densification. This study reveals the intrinsic growth mechanism of the product film in carbon storage environments

providing insights for a deeper understanding of the long-term integrity evolution of storage wellbores.

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