51313-02406-Electrochemical Study and Modeling of H2S Corrosion of Mild Steel

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Product Number: 51313-02406-SG

ISBN: 02406 2013 CP

Author: Yougui Zheng

Publication Date: 2013

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The internal corrosion of carbon steel in the presence of hydrogen sulfide (H2S) represents a significant problem in oil production and natural gas treatment facilities but the true mechanism of H2S corrosion is still not clear. This lack of knowledge represents a critical problem for the prevention and/or control of corrosion related to the presence of aqueous H2S. To investigate H2S corrosion mechanisms using observations during the initial contact of [H2S]aq and mild steel short term corrosion tests (1-2hr) were conducted in 1 wt.% NaCl solution at the different pH (pH2 to pH5) different temperature (30oC to 80oC) under various H2S/N2 concentrations (0-10%) and flow rate conditions using an X65 mild steel rotating cylinder electrode. Corrosion rates were measured by linear polarization resistance (LPR) and occasionally confirmed by weight-loss measurements. Corrosion mechanisms are investigated by use of potentiodynamic sweeps.
Experimental results have shown corrosion rates increase with increasing temperature pH2S flow rate and decreasing pH. Results of potentiodynamic sweeps show the presence of H2S could affect both cathodic reaction and anodic reaction.
A new electrochemical model was developed for short term uniform H2S corrosion based on modeling of individual electrochemical reactions in a water-H2S system. The model takes into account the electrochemical reactions of hydrogen ion reduction water reduction H2S reduction and anodic dissolution of iron. It can be used to simulate the effect of temperature pH pH2S and flow on corrosion of carbon steel in H2S environment. The short time experiments have shown that FeS layer didn’t provide any protection therefore this was not included in the model.