稀土铈对Fe-3Cr钝化膜电化学腐蚀行为的影响  

EFFECT OF CERIUM ON THE ELECTRONIC PROPERTY OF PASSIVE FILM FORMED ON Fe-3Cr ALLOY

作　　者：李党国[1,2] 冯耀荣[2] 白真权[2] 郑茂盛[1] 

机构地区：[1]西安交通大学材料科学与工程学院,西安710049 [2]中国石油天然气集团公司管材研究所,西安710065

出　　处：《中国腐蚀与防护学报》2008年第6期363-368,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点基础研究发展规划项目(G1999065004);国家自然科学基金项目(50231020)资助

摘　　要：利用电容测试法和电化学阻抗谱技术研究了稀土Ce对Fe-3Cr合金在1mol/L NaHCO3+0.5mol/L Na2CO3缓冲溶液中所形成的钝化膜电化学腐蚀行为的影响。结果表明:稀土Ce能大大降低钝化膜内的施主密度,使膜电阻和离子在膜内的传递电阻增大,导致离子在膜内的扩散能力降低。稀土的加入可以增强基体合金在含有Cl-缓冲溶液中的耐腐蚀性能。The influence of Ce on the semi-conductive property of passive film formed on Fe-3Cr alloy in 1 mol/L NaHCO3 ＋ 0.5 mol/L Na2CO3 buffer solution was studied by using capacitance measurement and electrochemical impedance spectroscopy （EIS）. The results showed that Ce can decrease the donor density value of the film formed on substrate alloy in the buffer solution, increase the transfer resistance and film resistance, and decrease the diffusion capability of ions in the film. Moreover, the addition of Ce can enhance the corrosion resistance of substrate alloy in the buffer solution.

关 键 词：电容测试法 电化学阻抗谱 半导体性能 施主密度 

分 类 号：TG172.3[金属学及工艺—金属表面处理]