氮、铌添加对304奥氏体不锈钢电化学腐蚀行为的影响  

INFLUENCE OF NIOBIUM AND NITROGEN ON THE RESISTANCE TO PITTING AND INTERGRANULAR CORROSION OF 304 AUSTENITIC STAINLESS STEEL

作　　者：孙涛[1] 邓博[1] 徐菊良[1] 李劲[1] 蒋益明[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《中国腐蚀与防护学报》2010年第6期421-426,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50871031;50701010);上海市科委专项基金(09ZR140Z600;09JC1401600)资助

摘　　要：采用极化曲线和电化学动电位再活化技术(EPR)研究了不同含量氮(N)、铌(Nb)元素的添加对304奥氏体不锈钢的耐点蚀和耐晶间腐蚀性能的影响。结果表明:N元素的添加可以显著提高材料的耐点蚀性能,但对于晶间腐蚀性能的影响却有不同的机制。少量的N会降低材料的耐晶间腐蚀性能,但含量增加到0.2%时,却可以提高耐晶间腐蚀性能;Nb元素的添加会明显增加材料的耐晶间腐蚀性能,但会降低其耐点蚀性能。基于以上结果,确定了N和Nb添加的最佳含量,并给出上述微量元素改变材料耐腐蚀性能的作用机制。The 304 austenitic stainless steels with the different doped content of nitrogen（N） and niobium （Nb）,have been tested separately using potentiodynamic polarization curve scanning and electrochemical potentiodynamic reactivation method（EPR）.The resistance to pitting corrosion of the specimens was evaluated by the pitting potential（E_b）,and the reactivation rate reflected the resistance to intergranular corrosion.The experiment results showed that the resistance to pitting corrosion of the 304 austenitic stainless steels has been obviously improved by the rising doped content of N.It was also observed that when there is a little doped content of N,the resistance to intergranular corrosion suffered a negative influence,but with the increasing amount of N（above 0.2%）,the bad effect for specimen resistance to intergranular corrosion disappeared.The Nb doping played a positive role in the specimen resistance to intergranular corrosion but a negative role in resistance to pitting corrosion.Based on the results above,a proper doped content of Nb and N was given,and the mechanism of the influence on the anticorrosion performance of the stainless steel caused by the microalloying was discussed.

关 键 词：304奥氏体不锈钢 氮 铌 点蚀 晶间腐蚀 

分 类 号：TG174.36[金属学及工艺—金属表面处理]