摘要
为探究膨胀机主轴的缝隙腐蚀行为,搭建了模拟缝隙腐蚀实验装置。通过电化学测试,确定了不同缝隙位置处的自腐蚀电位随时间的变化规律,并揭示了缝隙内腐蚀反应的发展过程。结果表明:缝隙内腐蚀反应经历双电层形成-氧浓差电池形成-金属水解三个反应过程。在富氧条件下,腐蚀产物的主要成分为Fe(OH)2。随着氧气的耗尽,氧浓差电池形成,腐蚀产物逐渐向FeOOH和Fe3O4转变。
In order to investigate the corrosion behavior of the spindle of expander, the simulation crevice corrosion experiment device was set up. Through electrochemical testing, the variation of self-corrosion potential at different position with time was determined, and the development of corrosion reaction in crevice was revealed. The results showed that the corrosion reaction in crevice has undergone three processes: the formation of double electric layer, the formation of oxygen concentration difference cell, and the hydrolysis of metal. Under oxygen- enriched conditions, the corrosion products were Fe (OH )2. As oxygen was exhausted and oxygen concentration difference batteries were formed, the corrosion products gradually transform to FeOOH and Fe3O4.
作者
王进庄
黄斌维
WANG Jinzhuang;HUANG Binwei(Guangdong Industrial and Commercial Senior Technical School,Lechang 512000,China;Lanzhou Petrochemical Polytechnic,Lanzhou 730060,China)
出处
《电镀与环保》
CAS
CSCD
北大核心
2020年第2期60-63,共4页
Electroplating & Pollution Control
基金
兰州石化职业技术学院教科研项目(JY2016-08)。
关键词
缝隙腐蚀
电化学阻抗谱
自腐蚀电位
氧浓差电池
crevice corrosion
electrochemical impedance
self-corrosion potential
oxygen concentration batery
