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.

Subject
Steel surfaces, Water, Inhibitor performance, Corrosion rate, Autoclaves, Thermal stability, Imidazolines, Solvents, Corrosion products, Corrosion inhibitors, Pitting, Corrosion protection, Corrosion coupons
Keywords:
Carbonic acid, steel, corrosion, inhibitor, high temperature
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2023
Association for Materials Protection and Performance (AMPP)
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