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Effect of Stress on Corrosion at Crack Tip on Pipeline Steel in a Near-Neutral pH Solution

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Abstract

In this work, the local corrosion at crack tip on an API 5L X46 pipeline steel specimens was investigated under various applied loads in a near-neutral pH solution. Electrochemical measurements, including potentiodynamic polarization and electrochemical impedance spectroscopy, combined with micro-electrochemical technique and surface characterization, were conducted to investigate the effect of stress on local anodic solution of the steel at the crack tip. The stress corrosion cracking of the steel was dominated by an anodic dissolution mechanism, while the effect of hydrogen was negligible. The applied load (stress) increased the corrosion rate at the crack tip, contributing to crack propagation. The deposit of corrosion products at the crack tip could protect somewhat from further corrosion. At sufficiently large applied loads such as 740 N in the work, it was possible to generate separated cathode and anode, further accelerating the crack growth.

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Authors and Affiliations

  1. Departmental of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada

    Yao Yang & Y. Frank Cheng

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  1. Yao Yang
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  2. Y. Frank Cheng
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Correspondence to Y. Frank Cheng.

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Yang, Y., Cheng, Y.F. Effect of Stress on Corrosion at Crack Tip on Pipeline Steel in a Near-Neutral pH Solution. J. of Materi Eng and Perform 25, 4988–4995 (2016). https://doi.org/10.1007/s11665-016-2369-9

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  • DOI: https://doi.org/10.1007/s11665-016-2369-9

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