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Kinetics and mechanism of the reaction of iron with sulfur vapor in the temperature range of 250 to 500°C
Author(s) -
Foroulis Z. A.
Publication year - 1978
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/maco.19780290602
Subject(s) - sulfur , activation energy , chemistry , atmospheric temperature range , reaction rate constant , vapor pressure , partial pressure , order of reaction , kinetics , reaction mechanism , rate equation , limiting , thermodynamics , range (aeronautics) , analytical chemistry (journal) , chemical kinetics , inorganic chemistry , materials science , organic chemistry , catalysis , oxygen , physics , quantum mechanics , mechanical engineering , engineering , composite material
The kinetics and mechanism of the reaction between iron and sulfur vapor were investigated in the temperature range of 250 to 500°C and sulfur vapor pressures of 10 to 300 mm Hg. The sulfurization of iron has been found to follow a parabolic law. In the temperature range 250 to 370°C the reaction product consisted of an inner FeS scale, and an outer thin FeS 2 layer. The activation energy of this process amounts to 27 kcal/mole, and the parabolic reaction rate constant varies according to approximately the 1/2 power of the sulfur pressure. In the temperature range 370 to 500°C the reaction product consists entirely of an FeS scale. The activation energy of the limiting process in this temperature range is about 14 kcal/mole. The parabolic reaction rate constant at 500°C shows a sulfur pressure dependence according to approximately the 1/7 power of the sulfur vapor pressure. The mechanistic significance of the experimental results is considered in some detail.