316L不锈钢在含氯高温醋酸溶液中的自钝化行为  

Self-passivating behavior of 316L stainless steel in high-temperature acetic acid solution

作　　者：程学群[1] 李晓刚[1] 杜翠薇[1] 

机构地区：[1]北京科技大学材料科学与工程学院腐蚀与防护中心,北京100083

出　　处：《北京科技大学学报》2006年第9期840-844,共5页Journal of University of Science and Technology Beijing

基　　金：中国石油化工股份有限公司科技开发中心资助项目;国家科技部基础条件平台建设资助项目(No.2004DKA10080)

摘　　要：研究了316L不锈钢在85℃,含0·2%KCl的60%醋酸溶液中的自钝化行为.通过测试试样的恒电流阴极极化曲线,以及恒电流阴极极化后开路电位随时间的变化曲线,提出了316L不锈钢钝化膜的结构模型.该模型认为316L不锈钢钝化膜由三层构成:最外层主要是由Fe的氧化物以及少量Cr的氧化物组成;第二层主要是Cr的氧化物,含有少量Fe,Mo和Ni的氧化物;最底层主要是Mo,Ni的氧化物和少量的Fe原子.研究发现:316L不锈钢在实验醋酸溶液中,经10mA阴极电流极化15min后钝化膜生长参数γ最大,而经0·45mA阴极电流极化30min后钝化膜生长参数γ最小;316L不锈钢在实验醋酸溶液中,经10mA阴极电流极化30min后,自钝化电位最小,而经1mA阴极电流极化15min后,自钝化电位最大.钝化膜结构模型能很好地解释316L不锈钢在实验醋酸溶液中的上述电化学行为.The self-passivating behavior of 316L stainless steel in acetic acid solution was studied. The constant current polarization curve and the corrosion potential-to-time curve were measured. The results showed that passivation film was formed by three layers： oxides of Fe and small amount Cr in the first layer; oxides of Cr and small amount Fe, Mo, Ni in the second layer; and oxides of Mo, Ni and small amount Fe in the third layer. The structure model of passivation film can explain the electrochemical results well.

关 键 词：电化学 不锈钢 钝化膜 醋酸 

分 类 号：TG172.6[金属学及工艺—金属表面处理]