超级13Cr不锈钢的钝化膜耐蚀性与半导体特性  

Corrosion resistance and semiconductor properties of passive films formed on super 13Cr stainless steel

作　　者：蔡文婷[1] 赵国仙[1] 赵大伟[2] 魏爱玲[1] 

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]中海油能源发展股份有限公司上海采油技术服务分公司腐蚀与防护工程技术中心,深圳518067

出　　处：《北京科技大学学报》2011年第10期1226-1230,共5页Journal of University of Science and Technology Beijing

摘　　要：利用极化曲线和Mott-Schottky曲线,研究了超级13Cr马氏体不锈钢在100、130、150和170℃且含CO2和Cl-的腐蚀介质中浸泡7 d所形成的钝化膜的电化学行为和半导体性质.同时应用光电子能谱表面分析技术分析了超级13Cr钝化膜中的元素价态.结果表明,超级13Cr马氏体不锈钢经腐蚀过后形成的钝化膜表层中Mo和Ni以各自硫化物的形式富集,而Cr以Cr的氧化物的形式富集.在100℃和130℃形成的钝化膜具有良好的耐蚀性,而在150℃和170℃形成的钝化膜耐蚀性下降.产生这种现象的原因与表面钝化膜的半导体性能密切相关,在100℃和130℃中形成的钝化膜具有双极性n-p型半导体特征,且随着温度升高掺杂数量增多,而150℃和170℃介质中形成的钝化膜为p型半导体,故随着温度升高,超级13Cr马氏体不锈钢的耐蚀性能下降.The electrochemical behavior and semiconductor properties of passive films formed on super 13Cr martensitic stainless steel in a corrosion solution which contains CO2 and Cl-soaked for 7d at 100,130,150 and 170 ℃ were examined using polarization curves and Mott-Schottky curves.The valence states of elements in the passive films were analyzed by X-ray photoelectron spectroscopy.It is shown that Mo and Ni in the forms of sulfides concentrate respectively in the surface layer of the passive films,but Cr in form of oxides enriches on the surface layer.The passive films formed at 100 ℃ and 130 ℃ are in possession of superior corrosion resistance,but the corrosion resistance of the passive films formed at 150 ℃ and 170 ℃ decreases.The reason for this phenomenon is concerned with the semiconductor properties of the passive films.A typical n-p-type semiconductor behavior is observed for the passive films formed at 100 ℃ and 130 ℃,the doping quantity increases with increasing temperature;but a p-type semiconductor behavior is observed for the passive films formed at 150 ℃ and 170 ℃.For this reason,the corrosion resistance of the martensitic stainless steel decreases with increasing temperature.

关 键 词：马氏体不锈钢 钝化膜 耐蚀性 半导体性质 极化曲线 

分 类 号：TG142.71[一般工业技术—材料科学与工程]