Corrosion mitigation via a pH stabilization method in monoethanolamine-based solutions for post-combustion CO2 capture

Liangfu Zheng, James Landon, Naser S. Matin, Gerald A. Thomas, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

A pH stabilization method was investigated to mitigate corrosion in aqueous 5 M monoethanolamine for post-combustion CO2 capture. The room temperature pH of a naturally aerated CO2-loaded solution (i.e., 9.7) was adjusted with NaHCO3 powders to 9.3 and 9.1, and its effect on corrosion of A106 carbon steel was studied. Lower pH initially accelerated corrosion but promoted protective FeCO3 layer formation and subsequently A106 passivation (i.e., Fe3O4 formation). Dissolved oxygen also played a pivotal role by functioning as an additional oxidizer, retarding FeCO3 formation via preferentially oxidizing Fe2+ to form rust, and promoting passivation of A106 under the FeCO3 layer.

Original languageEnglish
Pages (from-to)281-292
Number of pages12
JournalCorrosion Science
Volume106
DOIs
StatePublished - May 1 2016

Bibliographical note

Funding Information:
The authors acknowledge the Carbon Management Research Group (CMRG) members, including Duke Energy , Electric Power Research Institute (EPRI) , Kentucky Department of Energy Development and Independence (KY-DEDI) , Kentucky Power (AEP) , and LG&E and KU Energy , for their financial support. Also, the authors acknowledge Nicolas E. Holubowitch for his help in discussion and English correction, and Allen Flath and Neal Koebcke for their help in liquid analysis.

Publisher Copyright:
© 2016.

Keywords

  • A. Carbon steel
  • B. ICP-OES
  • B. Polarization
  • C. Alkaline corrosion
  • C. Passivity
  • C. Rust

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Materials Science (all)

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