OFCe S Bm Al S Ce Fig.2 Rare earth Inclusion Ce202S()and CeAlO3()(taken in SEM) mum content of rare earth elements (CRE]/CS]2.0)is a ductile fracture.In ductile dimples there some spherical rare earth inclusions.The appearance of ductile fracture may be arise from modifying of the inclusions. Fig.3 The fractography of impact samples a.RE addition, b,〔RE)/〔S]2.0 2.4 Raising the Ability for Corrosion Resistant by Sea Water in the 16Mn Steel with Rare Earth Element Addition The results have shown that rare earth element Ce or La play a significant role in many field,such as deoxidizing,desulphurizing,controlling the morphology of sulphide in the 16Mn steel;cleaning boundary and matrix;sphericizing inclu- sions and improving the distribution of stress and so on.Thus the ability for corrosion resistant by sea water in the 16Mn steel are raised.The anodic and cathodic polarization curves of the steel are measured with CMS (Corrosion Mea- surement System)(see Fig.4 and Fig.5).It is also got Vo(o+<Vo() <Vo(om)and Io()<o<(),are listed in Table 5. 595月 『 卜 ， 。 。 ‘月 土一 〔 〕 〔 〕 、 。 。 。 。 卜 丫 。 ， 。 〔 〕 〔 〕 、 。 卜 丫 一 ， ， ， · · 犷。 从 。 厂。 。 从 。 ， 厂。 ， 。 城 。 。 。 十 。 。 、 。 林 二 十 。 。 。 从 。