D0I:10.13374/j.issn1001-053x.1989.06.033 北京科技大学学报 第11卷第6期 Vol.11 No.6 1989年11月 Journal of U'niversity of Science and Technology Beijing Nov,1989 Physico-Chemical Behaviour of Rare Earth Elements and Ability for Corrosion Resistant' Li Wenchao(李文超)，Ling Yanping(凌燕平)， Li Ying(李英)，Ye Zhiyuan(叶志远) ABSTRACT:The physico-chemical behavior of rare earth elements in low sulphur 16Mn steel and their ability to enhance the corrosion resistance of the steel in sea water studied in this paper.The results indicate that Ce and La in 16Mn steel all have the abilities such as deoxidation,desulphidation,refining grains and cleaning grain boundaries and matrix etc.The anodic and cathodic polarization curves show that the rare earth elements added in 16Mn steel enhance the corrosion resistance of the steel in sea water. KEY WORDS:rare earth element,corrosion resistance,physico-chemical behavior 16Mn steel is widely used a material in industry for brige,shipping,auto- mobile and boiler container etc.Its ability for corrosion resistant at -40-450C is 20~38%higher than normal carbon steel.But the ability for corrosion resi- stant by sea water in 16Mn steel with rare earth element addition has been reported in a little paper. In paperst1 has been studied modifying of non-metallic inclusions in 16Mn stcel with rare earth elements.The non-metallic inclusions in the steel without rare earth elements were mainly MnS,aluminate and silicate in which the amount of the sulphide inclusions was up to 90%.Luyckx et al.t1 shows that MnS inclusion has completely disappeared when adding rare earth elements in alloys is CREJ/CS)3,whcre RE stands for rare earth elements.In present paper the ability for corrosion resistant by sea water in the 16Mn steel with addition of rare earth element Ce or La has been studied.The deoxidation ability by the elements and an appearance order of rare earth inclusions have been considered by thermodynamics. Manuscript Reccived May 8,1989 ··Dept,of Physical Chemistry 590第 卷 第 期 北 京 科 技 大 学 学 报 年 月 下 。 一 。 。 一 ’ 床 李文 超 ， 犷 凌 燕 平 ’ 李英 ， ’ 。 叶 志 远 二 尹 一 几 一 ， ， 一 王 、 ， 一 ， ， 一 〕 丁 ， ， · 一 一 一 · 一 一 。 一 ， 。 一 ‘ 、 尸 〔 〕 〔 〕梦 ， 、 ， · · ， 二 丫 ， 户声 DOI ：10．13374／j ．issn1001－053x．1989．06．033