SEM and EDX analyses of the scales formed on Fe—24Cr—5V—Pd and Fe—24Cr—5Mo—Pd alloy systems

Abstract

AbstractSEM and EDX analyses were used to characterize the morphologies of the scales formed on the Fe—24Cr—5V—Pd and Fe—24Cr—5Mo—Pd alloy systems in air at 900°C. SEM observations revealed that porous and non‐protective FeCr2O4 scales were formed on the Fe—24Cr—5V—Pd alloy system. Addition of Pd has no influence on the oxidation performance of the Fe—24Cr—5V alloy. However, thin and adherent Cr2O3 scales were formed on the Fe—24Cr—5Mo—Pd alloy system. The EDX analyses showed that Pd was enriched at the oxide—alloy interface of the Fe—24Cr—5Mo—3Pd alloy. This Pd‐enriched layer provided a fast diffusion path for Cr to form Cr2O3 oxide scales.