The oxidation of binary iron-manganese alloys

Oxide scales formed on iron-manganese alloys are generally considered to be similar to those formed on the parent metals. Metallographic examination is used in conjunction with EMPA, XRD, and X-ray imaging to reveal the presence of the additional phases Mn₂O₃ and Mn₃O₄ in the scales formed on binary alloys containing up to 40% manganese at 700 and 800°C in 200 Torr oxygen. A mechanism is proposed to explain the apparent change in growth from iron-rich to manganese-rich scales during oxidation of Fe-40Mn at 800°C.