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51316-7340-Investigation of Cathodic Reaction Mechanisms of H2S Corrosion Using a Passive SS304 Rotating Cylinder Electrode

Picture for Investigation of Cathodic Reaction Mechanisms of H2S Corrosion Using a Passive SS304 Rotating Cylind
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 The internal corrosion of pipeline steel in the presence of hydrogen sulfide (H₂S) represents a significant problem in oil and gas industry.  In the present study, experimentation was conducted to better resolve the direct reduction of H₂S while minimizing the effect of the anodic reaction by using a passive stainless steel working electrode.

 

 

 

Product Number: 51316-7340-SG
ISBN: 7340 2016 CP
Author: Yougui Zheng
Publication Date: 2016
Industry: Science of Corrosion
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The internal corrosion of pipeline steel in the presence of hydrogen sulfide (H₂S) represents a significant problem in oil and gas industry. Its prediction and control pose a challenge for the corrosion engineers. In previously published research by the same authors, an electrochemical model of H₂S corrosion was developed in both pure H₂S and H₂S/CO₂ aqueous systems. An additional electrochemical cathodic reaction, direct H₂S reduction, was uncovered based upon the carbon steel corrosion experimental results. However, in the carbon steel corrosion experiments, the cathodic sweeps experienced interference by the anodic iron dissolution reaction, making the kinetics of cathodic reactions unclear. In the present study, experimentation was conducted to better resolve the direct reduction of H₂S while minimizing the effect of the anodic reaction by using a passive stainless steel working electrode. The electrochemical kinetics parameters for H₂S reduction (i.e. Tafel slope, exchange current density, and reaction order with H₂S concentration) were determined. Moreover, the electrochemical kinetics parameters for H+ reduction were also revisited.

 

Keywords: internal corrosion, H2S, oil & gas, electrochemical, downloadable

 

 

 

 

The internal corrosion of pipeline steel in the presence of hydrogen sulfide (H₂S) represents a significant problem in oil and gas industry. Its prediction and control pose a challenge for the corrosion engineers. In previously published research by the same authors, an electrochemical model of H₂S corrosion was developed in both pure H₂S and H₂S/CO₂ aqueous systems. An additional electrochemical cathodic reaction, direct H₂S reduction, was uncovered based upon the carbon steel corrosion experimental results. However, in the carbon steel corrosion experiments, the cathodic sweeps experienced interference by the anodic iron dissolution reaction, making the kinetics of cathodic reactions unclear. In the present study, experimentation was conducted to better resolve the direct reduction of H₂S while minimizing the effect of the anodic reaction by using a passive stainless steel working electrode. The electrochemical kinetics parameters for H₂S reduction (i.e. Tafel slope, exchange current density, and reaction order with H₂S concentration) were determined. Moreover, the electrochemical kinetics parameters for H+ reduction were also revisited.

 

Keywords: internal corrosion, H2S, oil & gas, electrochemical, downloadable

 

 

 

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