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The effects of excimer laser annealing and yttria on corrosion of an FeCrNi alloy at 700°C
Author(s) -
Baer D. R.,
Wright I. G.,
Jervis T. R.
Publication year - 1990
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740150214
Subject(s) - alloy , corrosion , materials science , annealing (glass) , excimer laser , microstructure , oxide , metallurgy , sulfide , yttria stabilized zirconia , laser , metal , cubic zirconia , optics , physics , ceramic
Several surface and near‐surface analysis methods have been used to examine the effects of excimer (KrF, 248 nm) laser annealing and the addition of 2 wt.% Y 2 O 3 on the early stages of corrosion of an Fe‐25Cr‐20Ni alloy at 700°C. Two specific questions were addressed experimentally: (1) Can excimer laser treatment improve the corrosion properties of the FeCrNi alloy in a mixed gas environment (containing oxygen and sulfur)?; (2) Does the Y 2 O 3 ‐induced improvement of the corrosion behavior of the alloy result from prevention of S segregation to the surface or scale‐metal interface? Results show that laser annealing increased the Cr surface concentration of the treated alloy, but did not enhance the formation of a Cr‐rich oxide. However, the treated alloy was less susceptible to scale breakdown and sulfide formation. Surface segregation of S was not prevented by the Y 2 O 3 addition. Differences between doped and undoped alloys may be attributable primarily to changes in microstructure.