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High Temperature Sulfidic Corrosion of Carbon Steel in Model Oil/Sulfur Compound Blends

Picture for High Temperature Sulfidic Corrosion of Carbon Steel in Model Oil/Sulfur Compound Blends
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In this work, the kinetics of sulfidic corrosion of carbon steel as a function of temperature, model sulfur compound concentration and test duration have been studied by a weight loss method.

Product Number: 51317--8909-SG
ISBN: 8909 2017 CP
Author: Samin Sharifiasl
Publication Date: 2017
Industry: Science of Corrosion
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Sulfidic corrosion of steels is defined as a high temperature (≥450 oF/232 oC) degradation phenomenon that occurs in oil containing sulfur species. Over the last few decades, many researchers have studied sulfidic corrosion; however, precisely predicting sulfidic corrosion rate is still a challenging task. In this work, the kinetics of sulfidic corrosion of carbon steel as a function of temperature, model sulfur compound concentration and test duration have been studied by a weight loss method. Hydrotreated vacuum gas oil (HVGO) was used as a solvent and dimethyl disulfide (DMDS) as a model sulfur compound. DMDS is an ideal compound for this type of study, because of its high sulfur content (68%) and its decomposition temperature range of 360-450 oF (182-232 oC). It was found that the corrosion rate strongly depends on the concentration of sulfur species, temperature and time. The activation energy and reaction order with respect to DMDS concentration were extracted from the experimental data. The structure, morphology and chemical composition of the corrosion scales were further analyzed using the scanning electron microscope (SEM).

Keywords: Sulfidic corrosion, DMDS, refinery, high-temperature corrosion

Sulfidic corrosion of steels is defined as a high temperature (≥450 oF/232 oC) degradation phenomenon that occurs in oil containing sulfur species. Over the last few decades, many researchers have studied sulfidic corrosion; however, precisely predicting sulfidic corrosion rate is still a challenging task. In this work, the kinetics of sulfidic corrosion of carbon steel as a function of temperature, model sulfur compound concentration and test duration have been studied by a weight loss method. Hydrotreated vacuum gas oil (HVGO) was used as a solvent and dimethyl disulfide (DMDS) as a model sulfur compound. DMDS is an ideal compound for this type of study, because of its high sulfur content (68%) and its decomposition temperature range of 360-450 oF (182-232 oC). It was found that the corrosion rate strongly depends on the concentration of sulfur species, temperature and time. The activation energy and reaction order with respect to DMDS concentration were extracted from the experimental data. The structure, morphology and chemical composition of the corrosion scales were further analyzed using the scanning electron microscope (SEM).

Keywords: Sulfidic corrosion, DMDS, refinery, high-temperature corrosion

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