The Formation Mechanism of a Multilayer-Structure Oxide Film during the Oxidation of FeCrAl in Air at 700 °C

A protective oxide film is the key to corrosion resistance of FeCrAl alloy. The mechanism formation multilayer alloy in 700 °C air was explored by studying structure evolution and oxidation kinetics FeCrAl. results show that a layer formed on surface after 1344 h, with (Fe,Cr)2O3 layer, an Al-rich Al-depleted zone, new sequentially arranged from matrix. This indicates Al element plays important role film. matrix depleted form resulting zone. under zone internal oxidation. It should be noted precipitation AlN phase observed, which might probable factor for