Evaluation of the impact of chloride ion concentration on stress corrosion cracking in E690 steel under low pH conditions

In this work, the effect of Cl- concentration on the stress corrosion cracking (SCC) behaviour of E690 steel in low pH solution was studied. The SCC behaviour of E690 steel is controlled by the combination of anodic dissolution and hydrogen embrittlement. The Cl- concentration has a significant effect on the electrochemical reaction, and icorr and Ecorr increase first and then decrease as the Cl- concentration increases from 0.5 to 4.0 mol/L. The SCC behaviour of E690 steel is affected by the electrochemical reaction. Thus, the SCC susceptibility increases first and then decreases as the Cl- concentration increases from 0.5 to 4.0 mol/L.