Relationship between coking and metal dusting

C. M. Chun, Trikur A. Ramanarayanan, J. D. Mumford

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

Metal dusting is a severe form of corrosive degradation that Fe, Co and Ni base high temperature alloys undergo when subjected to environments supersaturated with carbon (ac > 1). This corrosion process leads to the break-up of bulk metal into metal powder. The present study focuses on the fundamental understanding of the corrosion of Fe and Ni in carbon-supersaturated environments over the temperature range, 350-1050°C. Building on earlier research, the role of deposited carbon in triggering corrosion is further clarified. For Fe, the corrosion rate peaked at ∼575°C with a sharp decrease in rate on either side of the maximum. High-resolution electron microscopy revealed, in addition to metal particles, a mixture of graphitic carbon, amorphous carbon and filamentous carbon in the corrosion product. While the presence of a surface layer of Fe3C was characteristic of corrosion up to 850°C, such a layer was absent at the higher temperatures. The corrosion rate maximum that typified the metal dusting of Fe was absent in the case of Ni where no surface carbide occurs until temperatures well below 350°C. The mechanistic differences between iron corrosion and nickel corrosion are compared and contrasted.

Original languageEnglish (US)
Pages (from-to)634-639
Number of pages6
JournalMaterials and Corrosion - Werkstoffe und Korrosion
Volume50
Issue number11
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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