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51314-3907-Electrochemical Model Of Mild Steel Corrosion In A Mixed H2s/Co2 Aqueous Environment

Picture for Electrochemical Model Of Mild Steel Corrosion In A Mixed H2s/Co2 Aqueous Environment
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Product Number: 51314-3907-SG
ISBN: 3907 2014 CP
Author: Yougui Zheng
Publication Date: 2014
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The present study has been conducted to investigate the electrochemistry of mild steel corrosion in mixed H2S/CO2 environments and develop an electrochemical model to simulate the experimental results. The experiments were designed to determine the effect of H2S on CO2 corrosion. Tests were conducted at different H2S concentrations from 0 to 10% in gas phase at 1 bar pressure in solution conditions at pH4 and pH5. Corrosion rates were measured by linear polarization resistance (LPR) and the corrosion mechanisms were investigated by using potentiodynamic sweeps (PD). Results show that the presence of H2S slows down the charge transfer kinetics related to H2CO3 reduction and H2O reduction in on the metal surface. An electrochemical model for short term exposures of a few hours was developed for this H2S/CO2 system with verification by experimental results and refereed journal papers. The model prediction overestimates the experimental results for longer term exposures (days) due to the formation of iron sulfide corrosion product layer.
The present study has been conducted to investigate the electrochemistry of mild steel corrosion in mixed H2S/CO2 environments and develop an electrochemical model to simulate the experimental results. The experiments were designed to determine the effect of H2S on CO2 corrosion. Tests were conducted at different H2S concentrations from 0 to 10% in gas phase at 1 bar pressure in solution conditions at pH4 and pH5. Corrosion rates were measured by linear polarization resistance (LPR) and the corrosion mechanisms were investigated by using potentiodynamic sweeps (PD). Results show that the presence of H2S slows down the charge transfer kinetics related to H2CO3 reduction and H2O reduction in on the metal surface. An electrochemical model for short term exposures of a few hours was developed for this H2S/CO2 system with verification by experimental results and refereed journal papers. The model prediction overestimates the experimental results for longer term exposures (days) due to the formation of iron sulfide corrosion product layer.
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H2S corrosion mechanisms, specifically at high partial pressures of H2S (pH2S), have not been extensively studied because of experimental difficulties and associated safety issues. The current study was conducted under well-controlled conditions at pH2S of 0.05 and 0.096 MPa.
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05551 CO2 Corrosion Prediction Model - Basic Principles

Product Number: 51300-05551-SG
ISBN: 05551 2005 CP
Author: Stein Olsen, Statoil ASA; Anne Marie Halvorsen, Norsk Hydro ASA; Per G. Lunde, Norsk Hydro Americas;
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The NORSOK M-506 is an empirical model based on experiments undertaken in a single phase water flow loop. The data is from experiments with low content of iron ions in the water phase, and the model is thus regarded to give a fair representation of the maximum corrosion rate in a CO2 corrosion controlled system.
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08344 Experimental Evaluation of Corrosion Inhibitor Performance in Presence of Iron Sulfide in CO2/H2S Environment

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