Electrochemical Corrosion Behavior of TA2 Titanium Alloy Welded Joint in Cl- Containing Solutions
Sheji Luo, Pai Yan, Ming Liu, Yuna Xue, Wenwen Song
Abstract
The electrochemical corrosion behavior of TA2 base metal and welded joint in Cl - containing (3.5%NaCl, 5.0%NaCl, 7.5%NaCl) solutions was studied by electrochemical test method. The results show that with the increase of Cl - concentration, the open circuit potential (OCP) of TA2 base metal and welded joint shifts negatively, the polarization resistance decreases gradually, and the corrosion current density increases. Compared with the base metal, the microstructure of the welded joint is different, which changes their corrosion resistance. It shows that the OCP of the welded joint shifts negatively, the polarization resistance is larger, and the corrosion current density is smaller, which indicates that the corrosion resistance of the welded joint is better.