Abstract
In this work, the anodic dissolution behavior of the fresh metal surface at crack tip of X70 steel in near-neutral pH environment was investigated using galvanic corrosion simulation method. The solution environment, strain, strain rate, hydrogen enrichment, and fresh metal surface at the crack tip were considered. Corrosion current of the specimen during fast stretching increased linearly with plastic strain. The increment and increase rate of the corrosion current during plastic deformation stage were dependent on the strain rate. Combining Faraday’s law and crack tip strain rate equation, the crack growth rate (CGR) induced by the anodic dissolution of the fresh metal surface was calculated. Results show that CGR caused by anodic dissolution was roughly one order lower than that measured on the compact tensile specimen under cyclic load. This finding indicated that hydrogen embrittlement may play a dominate role in stress corrosion crack propagation of pipeline steels in near-neutral pH environment.
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The authors wish to acknowledgement the financial support of National Natural Science Foundation of China (Nos. 51471034, 51131001 and 51601182) and National Basic Research Program of China (973 Program Project, No. 2014CB643300).
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Cui, Z., Wang, L., Liu, Z. et al. Anodic Dissolution Behavior of the Crack Tip of X70 Pipeline Steel in Near-Neutral pH Environment. J. of Materi Eng and Perform 25, 5468–5476 (2016). https://doi.org/10.1007/s11665-016-2394-8
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DOI: https://doi.org/10.1007/s11665-016-2394-8