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51318-11622-Effectiveness of an imidazoline-type inhibitor against CO2 corrosion of mild steel at elevated temperatures (120C-150C)

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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, 120C and 150C.

Product Number: 51318-11622-SG
Author: Yuan Ding / Bruce Brown / David Young / Marc Singer
Publication Date: 2018
Industry: Oil and Gas Production
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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, 120C and 150C. 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 120C, 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 150C, 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 150C, 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

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, 120C and 150C. 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 120C, 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 150C, 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 150C, 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

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Picture for The Effect of High Partial Pressure of CO2 on the Corrosion Mechanism of Carbon Steel in H2O-CO2 Systems
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51318-11623-The Effect of High Partial Pressure of CO2 on the Corrosion Mechanism of Carbon Steel in H2O-CO2 Systems

Product Number: 51318-11623-SG
Author: Tatiana C. Almeida / Oscar R. Mattos / Rogaciano M. Moreira / Merlin C. E. Bandeira
Publication Date: 2018
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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.
Picture for The use of a Novel Rotating Cage with Electrochemical measurements to evaluate corrosion inhibitor performance in CO2 environments
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51318-11618-The use of a Novel Rotating Cage with Electrochemical measurements to evaluate corrosion inhibitor performance in CO2 environments

Product Number: 51318-11618-SG
Author: Merlin C. E. Bandeira / Tatiana C. Almeida / Rafael F. Garcia / Oscar R. Mattos
Publication Date: 2018
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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.
Sudhakar Mahajanam / Fred Addington / Adarsh Ranganathan / Yuting Mao / Joanna Folse / Chloe Lins / Cesar Espinoza
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51318-11625-Cracking of Duplex Stainless Steel in Refining Operations

Product Number: 51318-11625-SG
Author: Sudhakar Mahajanam / Fred Addington / Adarsh Ranganathan / Yuting Mao / Joanna Folse / Chloe Lins / Cesar Espinoza
Publication Date: 2018
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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.
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