A study of morphology of simple oxidation and hot corrosion of the aligned Co-10 wt.% Cr-14 wt.% TaC alloy was performed at 900 C in still air. The morphology of simple oxidation was found to correlate well with previous results on similar alloys. Hot corrosion tests were performed by coating the samples with a thin layer of Na(sub 2)SO(sub 4) and exposing them to still air at 900 C. A radically different morphology was found and extensively analyzed using optical microscopy and the electron microprobe. These results are then explained using a localized reduction model of hot corrosion.
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