Mechanistic Aspect of Non-Steady Electrochemical Characteristic During Stress Corrosion Cracking of an X70 Pipeline Steel in Simulated Underground Water

Z.Y. Liu; L. Lu; Y.Z. Huang

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Mechanistic Aspect of Non-Steady Electrochemical Characteristic During Stress Corrosion Cracking of an X70 Pipeline Steel in Simulated Underground Water

机译：Mechanistic Aspect of Non-Steady Electrochemical Characteristic During Stress Corrosion Cracking of an X70 Pipeline Steel in Simulated Underground Water

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The stress corrosion cracking (SCC) and the electrochemical behavior of an API X70 pipeline steel in a simulated acidic soil solution were investigated using slow strain rate testing (SSRT), electrochemical polarization, and electrochemical impedance spectroscopy (EIS). The SCC mechanism of the X70 pipeline steel was found to be dependent on the range of applied potential including anodic dissolution (AD), hydrogen embrittlement (HE), and the combination of AD and HE (AD+HE). The potential range for each mechanism can be determined by comparing the current shift obtained from po-tentiodynamic curves at different scan rates. When both currents of the fast scan (i_f) and the slow scan rate polarization curve (i_s) are positive, i.e., i_f > 0 and i_s > 0, the SCC mechanism follows AD. When i_f > 0 and i_s < 0, the SCC mechanism is controlled by both AD and HE. SCC obeys the HE mechanism when i_f < 0 and i_s < 0. In this study, we propose a methodology for calculating SCC susceptibility (S_ψ). S_ψ is related to the currents obtained by the fast and slow scan rate polarization curves and by the results of SSRT. This method facilitates the immediate identification of SCC susceptibility.

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《Corrosion: The Journal of Science and Engineering》 |2014年第7期|678-685|共8页
作者
Z.Y. Liu; L. Lu; Y.Z. Huang;
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作者单位

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

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore. Department of Materials, University of Oxford, Oxfordshire, OX1 3PH, United Kingdom;

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正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
electrochemical character; mechanism; stress corrosion cracking; underground water; X70 pipeline steel;

Mechanistic Aspect of Non-Steady Electrochemical Characteristic During Stress Corrosion Cracking of an X70 Pipeline Steel in Simulated Underground Water

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