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Corrosion behaviour of various steels and alloys in a simulated coal liquefaction environment
Author(s) -
Fujikawa H.,
Shida Y.
Publication year - 1996
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.19960470403
Subject(s) - sulfidation , corrosion , materials science , metallurgy , chromium , alloy , austenite , high temperature corrosion , coal , oxygen , nickel , slurry , metal , microstructure , sulfur , composite material , chemistry , organic chemistry
The corrosion behaviour of Fe‐Cr, Ni‐Cr and Fe‐Cr‐Ni alloys was studied in simulated liquefaction environments over the temperature range of 623 to 723 K. Corrosion of alloys in these environments was controlled by both sulfidation and oxidation. In the slurry, the oxygen potential was apparently higher and the corrosion rate was smaller in comparison with those in the gas phase in the solvent only environment. An oxygen‐rich brown coal caused much smaller corrosion than a sub‐bituminous coal. With regard to the effect of the alloy compositions, chromium content controlled the corrosion rate. The Fe‐Cr‐Ni austenitic alloys were the most resistant. The Fe‐Cr alloys with high chromium content were fairly resistant, although they may be relatively sensitive to the variation of the environments such as temperature and H 2 S content. Ni‐Cr alloys of less than 20% Cr may have high corrosion rate due to their fast sulfidation. The structure of the scales formed on the alloys can be reasonably explained by the phase stability diagram of Metal‐O‐S system.