발간논문

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Vol.35, No.4, 468 ~ 477, 1997
Title
Effects of Cr , Mo , Nb and B on the Intergranular Corrosion Behavior of Fe-25at% Al Intermetallic Compounds
최한철 , 최답천 Han Cheol Choe , Dap Chun Choi
Abstract
Effects of the addition of Cr, Mo, Nb, and B to Fe-25at%Al intermetallic compound on the intergranular corrosion behavior were investigated using potentiostat. The specimens were casted by the vacuum arc melting. The subsequent homogenization and the stabilization led to the homogeneous DO₃ structure of the specimen. After the corrosion tests, the surface of the tested specimens were observed by the optical microscopy and scanning electron microscopy(SEM). For Fe-25at%Al intemetallic compound, the addition of Cr and Mo proved beneficial to decrease the grain boundary attack by decreasing activation current density. Addition of B and Nb resulted in a higher activation current density and also a higher passive current density. These results indicated the role of Cr and Mo in improving the intergranular corrosion resistance of Fe-25at%Al intermetallic compound. Boron and Nb addition to Fe-25at%Al accelerated the granular and also the intergranular corrosion. Fe-25at%Al containing Cr and Mo showed remarkably improved intergranular corrosion resistance in comparison with Born and Nb addition to Fe-25at%Al.
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