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A Modified Thermodynamic Model for the Prediction of Mild Steel Corrosion Products at High Temperature in H2S Environment

Picture for A Modified Thermodynamic Model for the Prediction of Mild Steel Corrosion Products at High Temperature in H2S Environment
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Predicting the corrosion products is of prime importance to understand the corrosion mechanisms and the protectiveness of the layer to the steel underneath. In an H2S environment however it is difficult to build a universal thermodynamic model (Pourbaix diagram) due to the polymorphous iron sulfide formation which is always kinetics related and time-dependent. What’s worse our recent high temperature studies show a thermodynamically less stable but kinetically favored inner Fe3O4 layer also comes into play and greatly affects the corrosion rate. In this work different partial pressures of H2S (pH2S=0.10~2.0 bar) and longer duration (21 days) experiments at high temperature were conducted to determine if Fe3O4 can eventually disappear as expected. The results show that Fe3O4 never disappeared but was always present as a “real” corrosion product layer. Therefore a modified thermodynamic model was proposed by reconsidering the Fe3O4 formation reaction and by keeping the Fe3O4 stability zone in Pourbaix diagram. The current model shows a better agreement with the experimental results.

Product Number: 51319-12869-SG
Author: Shujun Gao
Publication Date: 2019
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Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.

 
Picture for Formation Mechanisms of Iron Oxide and Iron Sulfide at High Temperature in H2S Corrosion Environment
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51318-11027-Formation Mechanisms of Iron Oxide and Iron Sulfide at High Temperature in H2S Corrosion Environment

Product Number: 51318-11027-SG
Author: Shujun Gao / Bruce Brown / David Young / Srdjan Nesic / Marc Singer
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Previous studies have shown that, from 80°C to 200°C in an H2S only environment, magnetite forms as an inner layer while iron sulfides are found in the outer layer. A descriptive model for the formation mechanisms of magnetite and iron sulfide at high temperature is presented.
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