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Passivity breakdown of carbon steel in hot potassium carbonate solutions

Journal Article


Abstract


  • This research studied passivity breakdown of carbon steel in conditions typical of hot potassium carbonate (HPC) acid gas processing plants. The pitting potential, evaluated from polarisation curves, indicated resistance to pitting increased with increasing equivalent carbonate concentration. The pitting potential was much more positive than the free corrosion potential for uninhibited concentrated carbonate solutions with pH values of 8.5 to 9.5. Therefore pitting is not an issue in these solutions. However, the carbon steel was susceptible to pitting corrosion in the dilute 1.0% bicarbonate solution of pH 8.0 for chloride concentrations in excess of 0.5 wt%. The critical chloride concentration was considerably above the maximum concentration of 0.1 wt% recorded in a typical HPC plant. Consequently chlorides should not usually be of concern to plant integrity. �� 2007 Springer Science+Business Media, LLC.

UOW Authors


  •   Linton, Valerie (external author)

Publication Date


  • 2007

Citation


  • Harjac, S. J., Atrens, A., Moss, C. J., & Linton, V. (2007). Passivity breakdown of carbon steel in hot potassium carbonate solutions. Journal of Materials Science, 42(24), 9940-9946. doi:10.1007/s10853-007-2076-x

Scopus Eid


  • 2-s2.0-35148872177

Start Page


  • 9940

End Page


  • 9946

Volume


  • 42

Issue


  • 24

Place Of Publication


Abstract


  • This research studied passivity breakdown of carbon steel in conditions typical of hot potassium carbonate (HPC) acid gas processing plants. The pitting potential, evaluated from polarisation curves, indicated resistance to pitting increased with increasing equivalent carbonate concentration. The pitting potential was much more positive than the free corrosion potential for uninhibited concentrated carbonate solutions with pH values of 8.5 to 9.5. Therefore pitting is not an issue in these solutions. However, the carbon steel was susceptible to pitting corrosion in the dilute 1.0% bicarbonate solution of pH 8.0 for chloride concentrations in excess of 0.5 wt%. The critical chloride concentration was considerably above the maximum concentration of 0.1 wt% recorded in a typical HPC plant. Consequently chlorides should not usually be of concern to plant integrity. �� 2007 Springer Science+Business Media, LLC.

UOW Authors


  •   Linton, Valerie (external author)

Publication Date


  • 2007

Citation


  • Harjac, S. J., Atrens, A., Moss, C. J., & Linton, V. (2007). Passivity breakdown of carbon steel in hot potassium carbonate solutions. Journal of Materials Science, 42(24), 9940-9946. doi:10.1007/s10853-007-2076-x

Scopus Eid


  • 2-s2.0-35148872177

Start Page


  • 9940

End Page


  • 9946

Volume


  • 42

Issue


  • 24

Place Of Publication