Electrochemical Characteristics of Passive Films on Surface of Nicke-based Alloy 825 in Corrosion Environment Containing H<sub>2</sub>S and CO<sub>2</sub>

ZHANG Ru-sheng; YANG Li-hong; ZHANG Zu-guo; ZHANG Xi-shun; YANG Bing; KUANG Yuan

doi:10.11973/fsyfh-201702007

Corrosion & Protection > 2017 > 38(2): 119-123,141. > DOI: 10.11973/fsyfh-201702007

ZHANG Ru-sheng, YANG Li-hong, ZHANG Zu-guo, ZHANG Xi-shun, YANG Bing, KUANG Yuan. Electrochemical Characteristics of Passive Films on Surface of Nicke-based Alloy 825 in Corrosion Environment Containing H₂S and CO₂[J]. Corrosion & Protection, 2017, 38(2): 119-123,141. DOI: 10.11973/fsyfh-201702007

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Electrochemical Characteristics of Passive Films on Surface of Nicke-based Alloy 825 in Corrosion Environment Containing H₂S and CO₂

1. Petroleum Production Department, Petroleum Exploration and Production Research Institute, Sinopec, Beijing 100083, China;
2. Patent Examination Cooperation Center, SIPO, Beijing 100083, China;
3. Material Department, China University of Petroleum(Beijing), Beijing 102249, China

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Received Date: August 26, 2015

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The passive films on the surface of nickel-based alloy 825 were corroded in the simulated corrosion environment of high temperature and high pressure gas field with H₂S and CO₂. The effects of temperature and partial pressure ratio of H₂S to CO₂ on the electrochemical behaviors of passive films were studied by testing polarization curves, electrochemical impedance spectroscopy (EIS) and Mott-Schottky curve (M-S curve). The results show that temperature and partial pressure ratio of H₂S to CO₂ exhibited the same effect rules. When the temperature rose or the partial pressure ratio of H₂S to CO₂ increased, the values of double layer capacitance, passive film capacitance and current carrier density increased, but the charge transfer resistance and the passive film resistance reduced, which indicated that the increase of temperature and partial pressure ratio of H₂S to CO₂ would increase the defects of passive films, and decrease the density and thickness of passive films, making the protection of passive films reduce.
- nickel-based alloy 825,
- passive film,
- Mott-Schottky curve

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Electrochemical Characteristics of Passive Films on Surface of Nicke-based Alloy 825 in Corrosion Environment Containing H2S and CO2

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Electrochemical Characteristics of Passive Films on Surface of Nicke-based Alloy 825 in Corrosion Environment Containing H₂S and CO₂