Abstract
AbstractThe corrosion of two Fe‐Nb alloys containing 15 and 30 wt% Nb has been studied at 600–800°C under 1 atm of pure oxygen. The reaction followed the parabolic rate law to a reasonable approximation with rate constants much lower than for the oxidation of pure iron under the same conditions. Internal oxidation and depletion of niobium in the alloy have never been observed. The external scales were composed of a matrix of Fe2O3 containing a dispersion of double Fe‐Nb oxide, while FeO and Fe3O4 were not observed. The oxidation behavior of these alloys is interpreted with reference to an approximate phase diagram of the ternary system FeNbO, taking into account the effects of the low solubility of niobium in the base metals and of the presence of two metal phases in the alloy.
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