Effect of thin-layer conditions on stress-corrosion cracking of X70 steel in near neutral pH solution at cathodic polarization
DOI:
https://doi.org/10.62638/ZasMat1337Abstract
The priority task of modern underground main pipelines is to ensure the reliability of its operation, which largely depends on understanding the processes that occur on the surface of the pipes in the ground under conditions of cathodic protection. The purpose of this work is to study the features of stress-corrosion cracking (SCC) of X70 steel under conditions of thin-layer corrosion in near neutral pH environment. Potentiometry, voltammetry, massometry, electrolytic hydrogenation slow strain rate tests, scanning electronic microscopy were used. Differences in SCC mechanism of X70 steel at potentials of -0.950 V and -1.050 V in the investigated environments were experimentally determined. At -0.950 V, SCC of X70 steel in NS4 proceeds by anodic dissolution mechanism, and in the model soil environment - by mixed mechanism; at -1.050 V, SCC in the NS4 solution occurs by a mixed mechanism, and in a soil environment based on NS4 – by a hydrogen embrittlement mechanism. Obtained regularities are due to more significant embrittlement of the near-surface layer of the specimens in the model soil environment in thin layers under cathodic polarization, which leads to a change in SCC mechanism from plastic-brittle to completely brittle.
Keywords:
pipe steel, slow strain rate tests, potentiometry, voltammetry, stress-corrosion cracking, thin-layer corrosion, hydrogenationReferences
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