Our samples are prepared with low oxygen-and low sulfur-content pure iron or antimony and minute cerium as additive as the case may be by livatation melting method. The existent state of Ce in the pure iron and the effect of Ce on Fe-Sb alloy are examined. The results of our investigation are as follows:(1) We find that the anticorrosive ability of crystal boundary of ferrite can be significantly improved due to the adding of cerium. At the crystal boundaries of ferrite the existence of Ce can not be detected; but meshes have been found at the boundaries of the δ-phase formed at high temperature. It is proved that the meshes has the constituent of CeAlO3 through electron diffraction anlysis.(2) The crystal boundaries of Fe-Sb alloys may be cleaned by adding Ce. After adding Ce, Fe3Sb2 is no longer found at the crystal boundaries of the alloys but there is CeSb in bulk crystals as compared with those alloys without Ce.