The electrochemical corrosion behavior of Ni-P coating in 3.5 wt% NaCl solution-containing CO2 and H2S was investigated using electrochemical methods and surface characterization techniques. The results show that the presence of H2S can enhance the CO2 corrosion of Ni-P coated carbon steel by affecting both anodic and cathodic processes. The adsorbed layer only exists in the very early stage of corrosion and barely improves the anticorrosion performance of the coating. The formation of corrosion products (NiO and Ni3S2) renders temporary protection during immersion, but the addition of H2S accelerates the diffusion process at the electrolyte/coating interface and promotes the electrolyte penetration through the coating, causing severe localized corrosion and coating disbondment. A corrosion model is proposed to illustrate the corrosion and degradation process of Ni-P coated steel in the CO2/H2S/Cl− environment.
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1 June 2020
SCIENCE SECTION|
March 11 2020
Insights into the Electrochemical Corrosion Behavior and Mechanism of Electroless Ni-P Coating in the CO2/H2S/Cl− Environment
Jiankuan Li;
Jiankuan Li
*Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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Chong Sun;
Chong Sun
*Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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Morteza Roostaei;
Morteza Roostaei
**RGL Reservoir Management Inc., 610, 700 2nd Street SW, Calgary, AB T2P 2W1, Canada.
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Mahdi Mahmoudi;
Mahdi Mahmoudi
**RGL Reservoir Management Inc., 610, 700 2nd Street SW, Calgary, AB T2P 2W1, Canada.
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Vahidoddin Fattahpour;
Vahidoddin Fattahpour
**RGL Reservoir Management Inc., 610, 700 2nd Street SW, Calgary, AB T2P 2W1, Canada.
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Hongbo Zeng;
Hongbo Zeng
*Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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Jing-Li Luo
Jing-Li Luo
‡
*Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
‡Corresponding author. E-mail: [email protected].
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CORROSION (2020) 76 (6): 578–590.
Article history
Received:
September 01 2019
Revision Received:
March 11 2020
Accepted:
March 11 2020
Citation
Jiankuan Li, Chong Sun, Morteza Roostaei, Mahdi Mahmoudi, Vahidoddin Fattahpour, Hongbo Zeng, Jing-Li Luo; Insights into the Electrochemical Corrosion Behavior and Mechanism of Electroless Ni-P Coating in the CO2/H2S/Cl− Environment. CORROSION 1 June 2020; 76 (6): 578–590. doi: https://doi.org/10.5006/3371
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