Journal of Materials Science

, Volume 42, Issue 18, pp 7762–7771 | Cite as

Influence of solution chemistry and surface condition on the critical inhibitor concentration for solutions typical of hot potassium carbonate CO2 removal plant

  • S. J. Harjac
  • A. AtrensEmail author
  • C. J. Moss
  • V. Linton


This research studied the influence of steel surface condition and solution chemistry on the critical inhibitor concentration required for spontaneous passivation of carbon steel in solutions typical of hot potassium carbonate plant (HPC). The inhibitor was added to the solution as V2O5. The critical inhibitor concentration depended on solution composition and on the steel surface condition. An inhibitor concentration of 30 g/l may be required to ensure spontaneous passivation under all conditions. The spontaneous passivation of clean polished carbon steel surfaces required a critical inhibitor concentration of 0.5–1.8 g/l. A minimum level of V5+ is required for inhibition, so that monitoring the V5+ concentration may be crucial to successfully managing corrosion protection in plant.


Steel Surface Vanadium Pentoxide Carbon Steel Surface Spontaneous Passivation Free Corrosion Potential 



The support of Santos Ltd for this work and permission to publish this paper is gratefully acknowledged. Thank you to Prof. Valerie Linton for allowing part of the research to be conducted at The University of Adelaide, South Australia.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • S. J. Harjac
    • 1
  • A. Atrens
    • 1
    Email author
  • C. J. Moss
    • 2
  • V. Linton
    • 3
  1. 1.School of EngineeringThe University of QueenslandBrisbaneAustralia
  2. 2.Santos LtdAdelaideAustralia
  3. 3.School of Mechanical EngineeringThe University of AdelaideAdelaideAustralia

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