Scaling phenomena in high temperature aqueous and gaseous environments containing sulphur

T. A. Ramanarayanan, S. N. Smith

Research output: Contribution to journalArticle

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Abstract

The sciences of aqueous corrosion and gaseous corrosion are distinct fields in their own right and there is little interactive research between the two fields. Aqueous corrosion generally occurs by the dissolution of metal ions into a conducting liquid medium; any film or scale formation in many instances induces passivity. On the other hand, scale formation and its rapid growth by ionic transport through the scale, can lead to significant corrosion in high temperature gaseous environments. In hot, aqueous environments at high pressures, both scale growth processes and metal dissolution processes can occur in concert. This situation is discussed, using the high temperature corrosion of carbon steel in gaseous H2S environments and H2S-saturated aqueous environments as an example. The corrosion processes described occur in the temperature range, 95-300degC. In the gaseous environment, corrosion is limited by both outward ferrous ion transport through a pyrrhotite (Fe1-x)>) scale and the rate of supply of sulfur to the iron sulfide surface by the dissociation of H2S. In the hot, H2S-saturated aqueous environment, on the other hand, the interplay between iron sulfide growth and its dissolution leads to a parabolically growing iron sulfide scale which reaches a limiting thickness at steady state corrosion. (A)

Original languageEnglish (US)
Journal[No source information available]
StatePublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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