TY - JOUR
T1 - Electrochemical Corrosion of Ultra-high Strength Carbon Steel in Alkaline Brines Containing Hydrogen Sulfide
AU - Feng, Ruishu
AU - Beck, Justin
AU - Ziomek-Moroz, Margaret
AU - Lvov, Serguei N.
N1 - Funding Information:
The authors would like to acknowledge the financial support and collaboration from the U.S. Department of Energy, National Energy Technology Laboratory (DOE-NETL) for this research. We would like to thank OLI systems Inc. for providing access to OLI Analyzer modeling software and, especially, Dr. Andre Anderko for his helpful suggestions on modeling. We would like to thank Mr. Keith Collins from DOE-NETL for his help with microscopic tests. We also want to thank Ian Wolfe and Rosemary Cianni from the Department of Energy and Mineral Engineering, The Pennsylvania State University, for their help with experimental preparation and preliminary data processing.
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/9/10
Y1 - 2016/9/10
N2 - Electrochemical corrosion of ultra-high strength carbon steel UD-165 was investigated using in-situ electrochemical techniques in H2S-containing alkaline brines (5 wt% NaCl; pH 7.9, 10.7, and 12.4) with four H2S partial pressures (pH2S) from 0 to 69 kPa at 85 °C. The effects of pH and pH2S were studied in terms of corrosion rate (CR), reaction mechanism, and corrosion products considering the Fe dissolution reactions with HCO3−(aq), OH−(aq), and HS−(aq). While CR generally decreased at higher pH and increased at higher pH2S, both accelerating and inhibiting effects of H2S on CR were observed. High CR at pH 10.7 correlated with a high ratio of HS−(aq) to the total concentration of reactive anions. The corrosion products changed from iron carbonate and sulfides to iron oxides as the pH increased. Sulfur was detected mostly in the inner layer of corrosion products at pH 7.9.
AB - Electrochemical corrosion of ultra-high strength carbon steel UD-165 was investigated using in-situ electrochemical techniques in H2S-containing alkaline brines (5 wt% NaCl; pH 7.9, 10.7, and 12.4) with four H2S partial pressures (pH2S) from 0 to 69 kPa at 85 °C. The effects of pH and pH2S were studied in terms of corrosion rate (CR), reaction mechanism, and corrosion products considering the Fe dissolution reactions with HCO3−(aq), OH−(aq), and HS−(aq). While CR generally decreased at higher pH and increased at higher pH2S, both accelerating and inhibiting effects of H2S on CR were observed. High CR at pH 10.7 correlated with a high ratio of HS−(aq) to the total concentration of reactive anions. The corrosion products changed from iron carbonate and sulfides to iron oxides as the pH increased. Sulfur was detected mostly in the inner layer of corrosion products at pH 7.9.
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U2 - 10.1016/j.electacta.2016.07.070
DO - 10.1016/j.electacta.2016.07.070
M3 - Article
AN - SCOPUS:84979584157
SN - 0013-4686
VL - 212
SP - 998
EP - 1009
JO - Electrochimica Acta
JF - Electrochimica Acta
ER -