Effect of alternating current on the electrochemical behavior and stress corrosion cracking of TA2 in simulated marine environment
Tianqi Chen, Zhongping Zeng, Xun Zhou, Hui Gao, Chao Liu, Zhiyong Liu, Zhanyuan Sun, Xiaogang Li
Abstract
This study investigated the effect of alternating current (AC) on the electrochemical and stress corrosion cracking (SCC) behavior and mechanism of TA2 in a simulated marine solution. The increase in the open circuit potential and charge transfer resistance indicated that the passivation film remained undamaged by varying AC densities, indicating a low risk of SCC. However, under the synergistic effect of AC and direct current (DC), the potential significantly shifted negatively, leading to hydrogen evolution reactions and the formation of a hydride layer. This hydride-induced hydrogen embrittlement posed a potential risk to the integrity of TA2.