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Effect of pH value on stress corrosion cracking of X70 pipeline steel in acidic soil environment

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effect of pH value on the stress corrosion cracking (SCC) of API X70 pipeline steel in simulated acidic soil solutions was investigated by using slow strain rate test, electrochemical polarization curves, electrochemical impedance spectroscopy, and scanning electron microscopy. pH plays an important role in the susceptibility and electrochemical mechanism of SCC. The pH higher than 5 has no significant effect on electrochemical processes. By contrast, the pH lower than 5 intensifies cathodic hydrogen evolution reactions, thus increasing the cathodic current and corrosion potential. Under different pH values, the SCC mechanism of X70 pipeline steel varies among anodic dissolution (AD), hydrogen embrittlement (HE), and the combination of AD and HE (AD + HE) with variations of applied potential. At −850 mVSCE, the SCC mechanism is HE if pH is less than 4 or AD + HE if pH value is more positive.

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Authors and Affiliations

  1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, 100083, China

    Zhiyong Liu, Cuiwei Du & Xiaogang Li

  2. Nuclear and Radiation Safety Center, Ministry of Environmental Protection of China, Beijing, 100082, China

    Xin Zhang & Fuming Wang

  3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Zhiyong Liu

Authors
  1. Zhiyong Liu
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  2. Cuiwei Du
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  3. Xin Zhang
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  4. Fuming Wang
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  5. Xiaogang Li
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Correspondence to Xiaogang Li.

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Liu, Z., Du, C., Zhang, X. et al. Effect of pH value on stress corrosion cracking of X70 pipeline steel in acidic soil environment. ACTA METALL SIN 26, 489–496 (2013). https://doi.org/10.1007/s40195-012-0216-z

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  • DOI: https://doi.org/10.1007/s40195-012-0216-z

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