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Effect of Temperature on Iron Sulfide Formation and Transformation on Steel Surface

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In sour (H2S) corrosion systems, a small amount of H2S can retard the general CO2 corrosion rate of carbon steel by forming a passive iron sulfide (FeS) layer [1], [2]. Environmental factors dictate the formation of protective or partially protective FeS layers on carbon steel surfaces. High H2S levels often result in stable films that reduce the corrosion rate, contingent upon the maintenance of the sulfide layer [2]. Conversely, in slightly sour systems, which initially form mackinawite (FeS) [3], the system has the potential to cause pitting and extremely high localized corrosion rates [2].

Product Number: MECC23-19971-SG
Author: Abdulrahman Alqahtani, Faisal Abbas, Omar Al-Saif, Layan AlSharif, Muthukumar Nagu, Christian Canto Maya
Publication Date: 2023
$20.00
$20.00
$20.00

The protective effect of H2S on steel corrosion arises from the formation of iron sulfide (FeS) passive films on steel surfaces. Various iron sulfides with different crystal structures, including mackinawite, cubic ferrous sulfide, pyrrhotite, and greigite, can develop as corrosion products for steel. The effect of those scales on corrosion damage is intricately linked to their physicochemical attributes and morphology. As multiphase streams move through pipelines, interplaying physical and chemical factors can lead to localized pitting attacks, especially where the iron sulfide film shows a weak crystalline structure. In this study, corrosion tests were performed under different H2S field environments. Scanning electron microscopy (SEM) and atomistic modeling were employed to understand the formation and disruption of protective scales at the atomic level.

The protective effect of H2S on steel corrosion arises from the formation of iron sulfide (FeS) passive films on steel surfaces. Various iron sulfides with different crystal structures, including mackinawite, cubic ferrous sulfide, pyrrhotite, and greigite, can develop as corrosion products for steel. The effect of those scales on corrosion damage is intricately linked to their physicochemical attributes and morphology. As multiphase streams move through pipelines, interplaying physical and chemical factors can lead to localized pitting attacks, especially where the iron sulfide film shows a weak crystalline structure. In this study, corrosion tests were performed under different H2S field environments. Scanning electron microscopy (SEM) and atomistic modeling were employed to understand the formation and disruption of protective scales at the atomic level.

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