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Active Corrosion of Sintered α‐Silicon Carbide in Oxygen–Chlorine Gases at Elevated Temperatures
Author(s) -
Park Dong S.,
McNallan Michael J.,
Park Chan,
Liang Winston W.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05199.x
Subject(s) - corrosion , chlorine , oxygen , silicon carbide , thermogravimetric analysis , materials science , silicon , carbide , high temperature corrosion , atmospheric temperature range , inorganic chemistry , carbon fibers , metallurgy , chemical engineering , chemistry , composite material , organic chemistry , physics , meteorology , composite number , engineering
The active corrosion of sintered α‐silicon carbide from heat exchanger tubes in the temperature range 900° to 1100°C in gas mixtures containing 2% Cl 2 by volume with additions of O 2 or H 2 has been investigated by thermogravimetric analysis and subsequent examination of the corrosion products. The presence of a small amount of oxygen accelerated rapid active corrosion in chlorine‐containing gas mixtures, but the corrosion was suppressed by an active‐to‐passive transition when the concentration of oxygen in the gas mixture was too high. Low rates of attack were observed in the environments containing H 2 even when the chlorine potential was high. The concentration of oxygen necessary to produce the active‐to‐passive transition was found to vary from one material to another and may be related to the amount of excess carbon in the sintered silicon carbide.