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Development of a Gas-Phase Corrosion Inhibitor for Wet-Gas Carbon Dioxide Corrosion at 200°C

Picture for Development of a Gas-Phase Corrosion Inhibitor for Wet-Gas Carbon Dioxide Corrosion at 200°C
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Although organic corrosion inhibitors have been widely applied in the energy industry, many details regarding their protection mechanism remain unknown. For example, a corrosion inhibitor adsorbs on the clean steel/aqueous solution interface, driven by electrostatic interaction. With the corrosion product
layer formed, how would the inhibitor adsorption interact with the corrosion product nucleation and precipitation? What is the effect of pre-corrosion in inhibitor testing?

Product Number: 51323-18829-SG
Author: Wei Zhang, Jason Moses, William Cardwell, Samar Agha Keshmiri, Khoa Ky, David Orta, Alyn Jenkins
Publication Date: 2023
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High-temperature applications remain a common challenge for organic chemistries because these chemistries might degrade under high temperatures. In this study, a corrosion inhibitor was developed for a gas compressor application at 200°C. The thermal stability, effect of various solvents, and interaction between the inhibitor molecule and the passive layer developed on C1018 carbon steel were compared experimentally. Corrosion models predicted that this passivating layer comprises primarily magnetite (Fe3O4), and surface scans showed that this passivating layer forms without the need for corrosion inhibitors. The surface scans also showed that naturally occurring defects developed in the passive-layer
matrix. As a result, although the general corrosion is expected to be low, a corrosion inhibitor is needed to mitigate localized corrosion or pitting. This paper discusses the process used to screen various corrosion inhibitor chemistries for use at 200°C. The results show that a quaternary amine-based product provides the best results under these conditions.

High-temperature applications remain a common challenge for organic chemistries because these chemistries might degrade under high temperatures. In this study, a corrosion inhibitor was developed for a gas compressor application at 200°C. The thermal stability, effect of various solvents, and interaction between the inhibitor molecule and the passive layer developed on C1018 carbon steel were compared experimentally. Corrosion models predicted that this passivating layer comprises primarily magnetite (Fe3O4), and surface scans showed that this passivating layer forms without the need for corrosion inhibitors. The surface scans also showed that naturally occurring defects developed in the passive-layer
matrix. As a result, although the general corrosion is expected to be low, a corrosion inhibitor is needed to mitigate localized corrosion or pitting. This paper discusses the process used to screen various corrosion inhibitor chemistries for use at 200°C. The results show that a quaternary amine-based product provides the best results under these conditions.

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