Abstract
Five Fe-Mn-Al (Fermal) alloys with the ferrite contents varied from 0.5% to 98% were tested in 3.5% NaCl at room temperature. Both potentiodynamic polarization and immersion test were performed. In deaerated solution, the corrosion potentials were very close for these alloys. The passive current increased and the width of the passive region decreased with the increase of ferrite content. However, the nearly ferritic alloy showed much better passivation behavior, persumably due to the addition of 6% Cr. In aerated solution, no or very small passive region was observed. From the immersion test, the general corrosion was found to be minor. Pitting corrosion was the primary corrosion except for the ferritic alloy. The pits were found more frequently in the ferrite phase or at the interface between the ferrite and austenite phases.