Metals and Materials International

, Volume 24, Issue 4, pp 752–760 | Cite as

In-Situ Electrochemical Corrosion Behavior of Nickel-Base 718 Alloy Under Various CO2 Partial Pressures at 150 and 205 °C in NaCl Solution

  • Yubi Zhang
  • Yongtao Zhao
  • An Tang
  • Wenjie Yang
  • Enzuo Li


The electrochemical corrosion behavior of nickel-base alloy 718 was investigated using electrochemical impedance spectroscopy and potentiodynamic polarization techniques at various partial pressures of CO2 (\(P_{{{\text{CO}}_{2} }}\)s) in a 25 wt% NaCl solution at 150 and 205 °C. The passive films composed of FeCO3 exhibit good corrosion resistance with a feature of Warburg impedance, Tafel plots show a complete passivation and the anodic reactions was dominated by a diffusion process at low \(P_{{{\text{CO}}_{2} }}\)s (1.8–9.8 MPa) at 150 °C. While numerous dented corrosion areas appeared on the sample surface for the \(P_{{{\text{CO}}_{2} }}\) of 11.6 MPa at 205 °C, the Tafel plot with three anodic peaks and the Nyquist diagram with an atrophied impedance arc were present. This dented corrosion attribute to the synergistic effects of stress, temperature, \(P_{{{\text{CO}}_{2} }}\) and Cl, the temperature and stress could play crucial roles on the corrosion of the alloy 718.


Nickel-base alloy EIS Polarization Carbon dioxide Corrosion 



This work was supported by the High School Key Scientific Research Projects of Henan Province (16A430002), the Science and Technology Open Cooperation Project of Henan Province (172106000062), the Doctoral Scientific Fund Project of the Henan Institute of Engineering (D2015015) and the High School Science and Technology Innovation Team Support Plan of Henan Province (18IRTSTHN005).


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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  1. 1.School of Mechanical EngineeringHenan University of EngineeringZhengzhouChina

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