Corrosion Behavior of Fe-Cr-Ni-Zr Alloys in Aggressive Environments at High Temperatures

摘要

The following influences of Zr on the scaling behavior of Fe-Cr-Ni alloys have been observed: (a) additions of 1 to 6% Zr promote protective oxide scale formation on the 12% Cr alloy in air; (b) a concentration of >3% Zr is required to promote protective oxide scale formation on 12% Cr alloys in a S-free, low-p//sub O sub 2 / environment; and (c) in mixed-gas environments, Zr reduces surface scale thickness, generally reduces sulfur penetration into the alloy, and shifts the threshold boundary to lower p/sub O sub 2 / for the 25% Cr alloy. 3 figures. (ERA citation 08:051627)