Passivity breakdown of carbon steel in hot potassium carbonate solutions
Date
2007
Authors
Harjac, S.
Atrens, A.
Moss, C.
Linton, V.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Journal of Materials Science, 2007; 42(24):9940-9946
Statement of Responsibility
S. J. Harjac, A. Atrens, C. J. Moss and V. Linton
Conference Name
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.
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Dissertation Note
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Description
The original publication can be found at www.springerlink.com