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Effects of Alloying Elements on the Surface Characteristics of Fe-38Al Intermetallic Compounds  

최한철 (조선대학교 치과대학 치과재료학교실 및 생체재료나노계면활성화센터)
Publication Information
Journal of the Korean institute of surface engineering / v.37, no.2, 2004 , pp. 128-136 More about this Journal
Abstract
Effects of alloying elements on the surface characteristics of Fe-38Al intermetallic compounds were investigated using potentiostat. The specimens were casted by the vacuum arc melting. The subsequent homogenization and the stabilization led to the homogeneous DO$_3$ structure of the specimen. After the corrosion tests, the surface of the tested specimen was observed by the optical microscopy and scanning electron microscopy(SEM). For Fe-38 at.% Al intermetallic compound, the addition of Cr and Mo proved to be beneficial in decreasing the grain boundary attack by decreasing the active current density. Addition of Band Nb resulted in a higher active current density and also a higher passive current density. These results indicated the role of Cr and Mo in improving the pitting corrosion resistance of Fe-38 at.%Al intermetallic compound. Band Nb addition to Fe-38 at.%Al accelerated the granular corrosion. Fe-38 at.%Al containing Cr and Mo showed remarkably improved pitting corrosion resistance in comparison with Band Nb addition to Fe-38 at. %Al.
Keywords
Fe-38 at.%Al Intermetallic Compound; Surface Characteristics; DO$_3$ Structure; Pitting Corrosion;
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