Study on the Galvanic Corrosion Behavior of Q235 /Ti Couple in Artificial Seawater

摘要

The corrosion behavior of Q235/Ti galvanic couple in the artificial seawater has been investigated byusing electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) and scanningelectron microscope (SEM) techniques. The results show that the whole corrosion process of Q235/Tigalvanic couple should be divided into three stages by using EIS technique, whereas the samecorrosion process can only be divided into two stages by using EN technique. There exists goodrelationship between the charge transfer resistance (Rct) obtained from EIS technique and the corrosionindex SE obtained by EN technique. EN technique is more sensitive to pitting corrosion than EIStechnique, and can be used to distinguish the main corrosion type.