Suitability and stability of 2-mercaptobenzimidazole as a corrosion inhibitor in a post-combustion CO2 capture system

Liangfu Zheng, James Landon, Neal C. Koebcke, Payal Chandan, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The corrosion inhibition of 2-mercaptobenzimidazole on A106 carbon steel and its stability in a post-combustion CO2 capture system with application of 5 M monoethanolamine aqueous solutions has been evaluated by linear polarization resistance, electrochemical impedance spectroscopy, immersion corrosion testing, scanning electron microscopy/energy dispersive spectroscopy, x-ray diffraction, and liquid chromatography-mass spectroscopy. Although no notable layer of protective corrosion product was found on the A106 surface at 80°C and atmospheric pressure for >180 h, corrosion was inhibited, and its polarization resistance increased nearly an order of magnitude when 2-mercaptobenzimidazole was added. However, degradation of 2-mercaptobenzimidazole, associated with the formation of an FeS layer with cracks, occurred at 108°C and 4.13×105 Pa.

Original languageEnglish
Pages (from-to)692-702
Number of pages11
JournalCorrosion
Volume71
Issue number6
DOIs
StatePublished - Jun 1 2015

Bibliographical note

Publisher Copyright:
© 2015, NACE International.

Keywords

  • Aqueous environments
  • Autoclave testing
  • Carbon dioxide
  • Carbon steel
  • Galvanic corrosion
  • Organic inhibitor
  • Sulfide stress cracking

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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