TY  - JOUR
AB  - Purpose– The purpose of this paper is to clarify the influence of the cathodic polarized potential on the stress corrosion cracking (SCC) susceptibility of X120 steel in a simulated acidic soil solution and the different SCC mechanisms at different cathodic polarized potentials.Design/methodology/approach– The SCC behaviors of X120 pipe steels at various potentials were investigated in a simulated acidic soil solution by slow strain rate tensile tests, electrochemical impedance spectroscopy and surface analysis techniques.Findings– The fracture surface of X120 steel stretched in air showed a ductile fracture. Both elongation and tensile strength of X120 steel in the simulated acidic soil solution decreased compared to that obtained in air. A slight cathodic polarization increased the elongation and tensile strength of X120 steel; therefore, the SCC susceptibility was lower at −0.65 VSCE than that at OCP, anodic dissolution dominates the corrosion process. However, a strong cathodic polarization induced hydrogen embrittlement, decreasing elongation and tensile strength, therefore, the SCC susceptibility was highest at −1.1 VSCE, and hydrogen embrittlement became the dominant process.Originality/value– The paper provides an essential insight into the mechanism of pipeline SCC for X120 steel in acidic soil environments.
VL  - 59
IS  - 6
SN  - 0003-5599
DO  - 10.1108/00035591211274497
UR  - https://doi.org/10.1108/00035591211274497
AU  - Liu Jing
AU  - Cheng JiHao
AU  - Hu Qian
AU  - Huang Feng
AU  - Xu JinQiao
AU  - Guo Bin
PY  - 2012
Y1  - 2012/01/01
TI  - The stress corrosion cracking behavior of X120 pipeline steel in a simulated acidic soil solution
T2  - Anti-Corrosion Methods and Materials
PB  - Emerald Group Publishing Limited
SP  - 311
EP  - 316
Y2  - 2024/04/23
ER  -