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

doi:10.1016/j.corsci.2016.02.013

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

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

33 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 language	English
Pages (from-to)	281-292
Number of pages	12
Journal	Corrosion Science
Volume	106
DOIs	https://doi.org/10.1016/j.corsci.2016.02.013
State	Published - May 1 2016

Bibliographical note

Publisher Copyright:
© 2016.

Funding

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.

Funders	Funder number
KU Energy LLC
Kentucky Energy and Environment Cabinet Department for Energy Development
East Kentucky Power Cooperative
Duke Energy
Electric Power Research Institute, Louisville Gas & Electric
American Electric Power

Keywords

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

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

Access to Document

10.1016/j.corsci.2016.02.013

Cite this

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

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.",

keywords = "A. Carbon steel, B. ICP-OES, B. Polarization, C. Alkaline corrosion, C. Passivity, C. Rust",

author = "Liangfu Zheng and James Landon and Matin, {Naser S.} and Thomas, {Gerald A.} and Kunlei Liu",

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AU - Zheng, Liangfu

AU - Landon, James

AU - Matin, Naser S.

AU - Thomas, Gerald A.

AU - Liu, Kunlei

PY - 2016/5/1

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N2 - 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.

AB - 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.

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KW - C. Rust

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