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Inhibition performance of a diethylenetriamine tall oil fatty acid imidazoline-type inhibitor (DETA/TOFA imidazoline) against CO2 corrosion of an API 5L X65 carbon steel was studied at two temperatures, 120C and 150C.
Production of oil and gas from increasingly aggressive geologic environments requires the development of appropriate corrosion mitigation strategies, including the selection of corrosion inhibitors with adequate performance characteristics. In this study, the inhibition performance of a diethylenetriamine tall oil fatty acid imidazoline-type inhibitor (DETA/TOFA imidazoline) against CO2 corrosion of an API 5L X65 carbon steel was studied at two temperatures, 120C and 150C. The corrosion measurements were performed in a CO2 saturated 1 wt.% NaCl electrolyte, via electrochemical measurements, in a standard autoclave and in a specially designed two-autoclave system. A two-autoclave design was developed and adopted for transferring heated, deoxygenated aqueous electrolyte to the autoclave containing the working electrode, thereby limiting specimen exposure to oxygen and eliminating long transition times associated with solution heating/cooling. At 120C, the two autoclave setup successfully enabled the identification of the true corrosion inhibitor behavior by preventing build-up of corrosion product layers. At this temperature, the imidazoline type inhibitor did adsorb on the steel surface with an inhibition efficiency of 61%. At 150C, the presence of inhibitor did not affect the corrosion profile, whatever the autoclave system used. The surfaces of the specimens retrieved from experiments were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). At 150C, the rapid formation of Fe3O4, rather than the effect of inhibitor, seemed to have controlled the corrosion behavior. However, the presence of the imidazoline-type inhibitor impeded the formation of corrosion product layers.
Key words: High temperature, CO2 corrosion, corrosion inhibition, imidazoline-type inhibitor, magnetite
The corrosion mechanism of X65 carbon steel was evaluated in water environment by increasing CO2 partial pressure from 1 bar at 24 °C to 110 bar at 40 °C, reaching conditions that include water saturated with supercritical CO2.
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In this paper, case studies related to DSS cracking are presented specific to the refining industry. Two cases of chloride stress corrosion cracking (Cl-SCC) of 2205 DSS tubing are presented.
Results: With the Electrochemical RC in Autoclave (ERCA) assembly it was possible to estimate the inhibitor efficiency - and the influence of concentration - by electrochemical data.