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Coke formation in metal dusting experiments
Author(s) -
Schmid B.,
Grong Ø.,
Ødegård R.
Publication year - 1999
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(199911)50:11<647::aid-maco647>3.0.co;2-#
Subject(s) - coke , metallurgy , waste management , materials science , petroleum coke , environmental science , process engineering , engineering
Selected samples of carbonaceous deposit from metal dusting corrosion have been investigated. The morphology and the internal structure were examined by light microscopy, environmental scanning electron microscopy, and energy‐dispersive analysis of X‐rays. Alternating structures within the carbonaceous deposits have been observed, which suggest that metal dusting is an oscillatory corrosion process. The results are discussed in the light of reported examples of oscillatory high‐temperature reactions. Nonequilibrium phases have been observed, and it is speculated on their origin and influence on metal dusting. The localized character of this corrosion type is emphasized. Conclusions about the influence of oxygen in the mechanism of metal dusting are given, leading to the idea of alternating carburizing and oxidizing conditions occurring in the metal dusting process.