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 V SCE 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 V SCE , 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.
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Nov 2, 2012
Keywords: Steel; Pipelines; Corrosion; Stress (materials); Stress corrosion cracking; X120 pipeline steel; Acidic soil solution; Hydrogen embrittlement; Anodic dissolution
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