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Acta Metallurgica Sinica (English Letters)

, Volume 32, Issue 5, pp 607–617 | Cite as

Corrosion Behavior of High-Strength Steel for Flexible Riser Exposed to CO2-Saturated Saline Solution and CO2-Saturated Vapor Environments

  • Da-Zheng Zhang
  • Xiu-Hua GaoEmail author
  • Lin-Xiu Du
  • Hong-Xuan Wang
  • Zhen-Guang Liu
  • Ning-Ning Yang
  • R. D. K. Misra
Article
  • 53 Downloads

Abstract

The corrosion behavior of high-strength steel used for flexible riser exposed to CO2-saturated saline solution and CO2-saturated vapor environments was studied through immersion experiment and electrochemical corrosion experiment. The corrosion behavior and mechanism of the tested steel were analyzed on the basis of corrosion kinetics, nature of corrosion products, corrosion product morphology, elemental distribution and polarization curves. The experimental results showed that the microstructure of the tested steel was bainitic microstructure. The corrosive activity of the tested steel exposed to CO2-saturated vapor environment was significantly lower than that exposed to CO2-saturated saline solution environment. On prolonging the exposure time, the corrosion rate gradually decreased, the corrosion heterogeneity increased, and the dimensions of FeCO3 crystals gradually became small. At later stages of corrosion, the corrosion current density decreased significantly and the anodic Tafel slope increased, indicating that the corrosion process was strongly inhibited. The corrosion mechanism of low-alloy steel with bainitic microstructure was proposed based on experimental results.

Keywords

Flexible riser High-strength bainitic steel CO2 corrosion Electrochemical behavior 

Notes

Acknowledgements

This work was carried out with financial support from the National High Technology Research and Development Program of China (Grant No. 2015AA03A501) and Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology (1062931702).

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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Da-Zheng Zhang
    • 1
  • Xiu-Hua Gao
    • 1
    Email author
  • Lin-Xiu Du
    • 1
  • Hong-Xuan Wang
    • 2
  • Zhen-Guang Liu
    • 3
  • Ning-Ning Yang
    • 1
  • R. D. K. Misra
    • 4
  1. 1.State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyangChina
  2. 2.Neptune Offshore Engineering Development Co., LtdTianjinChina
  3. 3.School of Material Science and EngineeringJiangsu University of Science and TechnologyZhenjiangChina
  4. 4.Department of Metallurgical, Materials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoUSA

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