The stress corrosion cracking behavior of X120 pipeline steel in a simulated acidic soil solution

The stress corrosion cracking behavior of X120 pipeline steel in a simulated acidic soil solution 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

The stress corrosion cracking behavior of X120 pipeline steel in a simulated acidic soil solution

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Publisher
Emerald Publishing
Copyright
Copyright © 2012 Emerald Group Publishing Limited. All rights reserved.
ISSN
0003-5599
D.O.I.
10.1108/00035591211274497
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Nov 2, 2012

Keywords: Steel; Pipelines; Corrosion; Stress (materials); Stress corrosion cracking; X120 pipeline steel; Acidic soil solution; Hydrogen embrittlement; Anodic dissolution

References

  • Hydrogen induced plasticity in stress corrosion cracking of engineering systems
    Delafosse, D.; Magnin, T.
  • Mechanics and thermodynamics on the stress and hydrogen interaction in crack tip stress corrosion: experiment and theory
    Mao, X.; Li, M.
  • Corrosion behavior of X‐70 pipe steel in near‐neutral pH solution
    Niu, L.; Cheng, Y.F.
  • Assessment of some factors influencing the fatigue life of strength mis‐matched HSLA steel weldments
    Ravi, S.; Balasubramanian, V.; Babu, S.; Nemat Nasser, S.

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