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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
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)
关键词
电化学
不锈钢
钝化膜
醋酸
electrochemistry
stainless steel
passivation film
acetic acid
