Abstract
Immersion experiments were carried out to study H2S/CO2 corrosion behavior of low-alloy pipeline steel in terms of microstructure, corrosion kinetics, corrosion phases, microscopic surface morphology, cross-sectional morphology and elemental distribution. The experimental results indicated that the microstructure of designed steel was tempered martensite. The corrosion rate followed exponential behavior. H2S corrosion dominated the corrosion process, and the corrosion products were mackinawite, greigite and troilite. The corrosion products changed from mackinawite/greigite to mackinawite/troilite, and mackinawite dominated the corrosion phases. The corrosion products became more compact with immersion time, which led to decrease in corrosion rate. The chromium and molybdenum content in the corrosion product was higher than that in the steel substrate.
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Acknowledgments
The authors are grateful for financial support from National High Technology Research and Development Program of China (2015AA03A501) and Natural Science Foundation of China (NSFC, 51274063) and gratefully acknowledge support from R.D.K. Misra, who is from the University of Texas at El Paso, USA.
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Liu, Z., Gao, X., Du, L. et al. Corrosion Behavior of Low-Alloy Pipeline Steel Exposed to H2S/CO2-Saturated Saline Solution. J. of Materi Eng and Perform 26, 1010–1017 (2017). https://doi.org/10.1007/s11665-017-2526-9
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DOI: https://doi.org/10.1007/s11665-017-2526-9