Corrosion Resistance of Cu-Ni-Si Alloy Under High-Temperature, High-Pressure H2S and Cl− Environments
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In this study, Cu-Ni-Si alloy was subjected to corrosion resistance tests under simulated high-temperature, high-pressure H2S and Cl− environments. The corrosion rates, electrochemical performance, surface morphologies, and chemical compositions of the Cu-Ni-Si alloy after corrosion were analyzed by the mass loss method, electrochemical impedance spectroscopy, scanning electron microscopy, energy-dispersive x-ray spectrometry, and x-ray diffraction. The results showed that, at the initial stage of corrosion, because of the loose corrosion product layer initially formed on the surface, a high corrosion rate was observed for the Cu-Ni-Si alloy under high-temperature, high-pressure environments. With the progress of corrosion, the corrosion rate gradually decreased and reached a steady state. Because at the later stage, a passive film was formed on the alloy surface, further inhibiting the corrosion of the alloy and improved its corrosion resistance. The Cu-Ni-Si alloy exhibited good corrosion resistance under high-temperature, high-pressure H2S and Cl− environments.
KeywordsCl− corrosion resistance Cu-Ni-Si alloy high pressure high temperature H2S
The authors acknowledge the financial support of the National Key Research and Development Program (No. 2016YFB0300700); National Natural Science Foundation (Nos. 51609133 and 5162195); and the China Postdoctoral Science Foundation (No. 2017M620153).
- 12.Y.K. Abdel, H.L. Faycal, A. Hiba, B. Thierry, B. Francois, A.L. Helbert, M.H. Mathon, K. Megumi, B. Djamel, and G. Terence, Microstructures and Textures of a Cu-Ni-Si Alloy Processed by High-Pressure Torsion, J. Alloys Compd., 2013, 574(10), p 361–367Google Scholar
- 14.H.W. Wang, P. Zhou, S.W. Huang, and C. Yu, Corrosion Mechanism of Low Alloy Steel in NaCl Solution with CO2 and H2S, Int. J. Electrochem. Sci., 2016, 11(2), p 1293–1309Google Scholar
- 17.E.H. Han, J.Q. Wang, X.Q. Wu, and W. Ke, Corrosion Mechanism of Stainless Steel and Nickel Base Alloys in High Temperature High Pressure Water, Acta Metall. Sin., 2010, 46(11), p 1370–1390Google Scholar