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Intergranular and Pitting Corrosion Behavior of Fe-25Al-6Cr Intermetallic Compounds Containing Mo, Nb and B

In order to investigate the intergranular and pitting corrosion behavior of Fe-25Al-6Cr intermetallic compounds containing Mo, Nb and B, 11 kinds of Fe-25Al were prepared by arc melting in Ar gas, using high purity aluminum and iron. The fabricated materials were heat treated for homogenious structure and stabilization of the iron aluminides. The electrochemical methods were used for interganular and pitting corrosion. Effects of Mo, Cr, Nb and B on the repassivation current density(Ir) and the active current density(Ia) of Fe-25Al-6Cr were recorded in the following order: Mo<Cr<Nb<B, with boron showing the highest active current density(Ia). Mo addition also proved to be most efficient in reducing the thickness of the intergranular corrosion. The pitting potential was increased in the order of Mo>Cr>Nb>B, from the highest to the lowest respectively.