碳钢缝隙内溶液化学和阳极极化行为研究

电化学（中英文） ›› 1999, Vol. 5 ›› Issue (2): 145-151.

碳钢缝隙内溶液化学和阳极极化行为研究

陈卓,杜翠薇,曹备,吴荫顺,杨海,张峥嵘

北京科技大学表面科学与腐蚀工程系

收稿日期:1999-05-28 修回日期:1999-05-28 出版日期:1999-05-28 发布日期:1999-05-28

Investigation of Solution Chemistry in Crevice of Carbon Steel and Its Anodic Polarization Behavior

Chen ZhuoDu Cuiwei*Cao BeiWu YinshunYang HaiZhang Zhengrong

(Dept. of Surface Sci. and Corrosion Engin., Univ. of Sci. and Tech. BeijingBeijing100083

Received:1999-05-28 Revised:1999-05-28 Published:1999-05-28 Online:1999-05-28

摘要/Abstract

摘要： 为研究缝隙腐蚀的溶液化学和缝中金属阳极极化行为，设计一种楔形缝隙模拟装置．以碳钢为研究对象，分别测试了在３．５％（ｗｔ）ＮａＣｌ溶液中缝内各位置的电极电位、Ｃｌ－浓度、ｐＨ值以及缝外阳极极化时电流密度的变化．结果表明：非极化状态下，距离缝口约２ｃｍ处的金属电位最负，最容易被腐蚀．缝外阳极极化促进缝隙腐蚀，并使得缝内溶液Ｃｌ－和Ｈ＋富集更严重；缝口金属受极化影响，腐蚀加剧，而缝隙深处却由于沉积盐膜作用而受到保护

关键词: 碳钢, 缝隙腐蚀, 溶液化学, 阳极极化

Abstract: A self_made wedge_shaped simulated crevice apparatus was designed to investigate the solution chemistry in crevice of carbon steel and its anodic polarization behavior. For carbon steel with 3.5%(wt) NaCl , the change and the distribution of electrode potential , concentration of Cl- and pH value of solution in the crevice, and the current density of metal in the crevice were measured respectively under various conditions of anodic polarization. The results showed that without polarization the metal about 2 cm away from the opening of the crevice was attacked preferentially because of its lowest free corrosion potential. The anodic polarization promoted the corrosion in the crevice, and increased H+ and Cl- concentrated in the crevice. The metal at the mouth of crevice was corroded more seriously because of the polarization, but the metal at the deep of crevice was protected by the film of salt.

Key words: Carbon steel, Crevice corrosion, Solution chemistry, Anodic polarization

中图分类号:

陈卓,杜翠薇,曹备,吴荫顺,杨海,张峥嵘. 碳钢缝隙内溶液化学和阳极极化行为研究[J]. 电化学（中英文）, 1999, 5(2): 145-151.

Chen ZhuoDu Cuiwei*Cao BeiWu YinshunYang HaiZhang Zhengrong . Investigation of Solution Chemistry in Crevice of Carbon Steel and Its Anodic Polarization Behavior[J]. Journal of Electrochemistry, 1999, 5(2): 145-151.

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https://electrochem.xmu.edu.cn/CN/Y1999/V5/I2/145

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