Corrosion Behavior of 718 Nickel Base Alloy in Acid Saline Solution Containing H₂S and CO₂

Abstract:

To resolve the materials corrosion problems during exploiting high H₂S/CO₂ oil and gas field, the corrosion behavior of 718 nickel base alloy for 720 hours was studied, the conditions of the experiment is about temperature=177°C, P(H₂S)=3.0MPa, P(CO₂)=13.5MPa, solution mixed NaCl 20%wt.. The Electronic Parts Manufacturers Association (EPMA) and electrochemical methods was applied to characterize the microstructure, chemical composition and impedance characteristics of corrosion film. The results show that the surface of corrosion film is mainly composition by sulphide of Ni, Cr and Fe, the inside of corrosion film is mainly composition by oxide of Ni, Cr and Fe, electrochemical analysis found the alloy could resist corrosion in this environment.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 90-94
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.90
• Online since: April 2016
• Authors: Chun Guang Wang*, Dong Zhe Wang, Hai Ding Liu, Wei Liu, Yan Mo, Jin Hui Song
• Keywords: EPMA Analysis, H₂S, High Pressure, High Temperature, Nickel Base Alloy, Passive Film

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