The influence of Si on the primary protection of lean FeCrAl model alloys in O2 and O2+H2O at 600 °C—A microstructural investigation

The present study investigates the influence of Si on high-temperature corrosion behavior lean FeCrAl model alloys in O2 and O2+H2O at 600 °C. addition prevented breakaway oxidation which may be explained by increased Al-content reduced Cr-content oxide (O2) as well Si-enrichment outer part scale (O2+H2O). A proposed explanation for impact Si-addition Cr- was given thermodynamic calculations showed that presence increases activity Al alloy while reducing Cr.