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51318-11269-Localized Corrosion in the Presence of Corrosion inhibitors at High Flow Velocities in CO2 Environment

Picture for Localized Corrosion in the Presence of Corrosion inhibitors at High Flow Velocities in CO2 Environment
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The main objective of this research was to evaluate the performance of different commercial inhibitors with emphasis on the impact of high flow velocities under highly corrosive conditions.

Product Number: 51318-11269-SG
Author: F. Farelas / M. Singer / D. Nugraha / S. Whitehurst / B. Kinsella
Publication Date: 2018
Industry: Chemical Inhibitors
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$20.00

High fluid velocities and associated shear stresses are typically encountered in oil and gas transportation pipelines and can lead to severe corrosion attack. One way to mitigate corrosion is by injection of corrosion inhibitors, which need to be effective in this challenging environment. The main objective of this research was to evaluate the performance of different commercial inhibitors with emphasis on the impact of high flow velocities under highly corrosive conditions. The importance of inhibitor concentration and effect of acetic acid was also investigated. Experiments were performed in a mid-scale flow loop, called thin channel flow cell, that enables the simulation of high flow velocities (high shear stress). Linear polarization resistance and weight loss measurements were performed to assess the inhibitors ability to decrease the general corrosion rate, while scanning electron microscopy was used for surface analysis. The occurrence of localized corrosion was evaluated by means of profilometry analysis. All the inhibitors tested showed excellent inhibition properties for general corrosion. However, localized corrosion as high as 100 mm/y was observed in some cases.

Key words: inhibition, CO2 corrosion, localized corrosion, carbon steel

High fluid velocities and associated shear stresses are typically encountered in oil and gas transportation pipelines and can lead to severe corrosion attack. One way to mitigate corrosion is by injection of corrosion inhibitors, which need to be effective in this challenging environment. The main objective of this research was to evaluate the performance of different commercial inhibitors with emphasis on the impact of high flow velocities under highly corrosive conditions. The importance of inhibitor concentration and effect of acetic acid was also investigated. Experiments were performed in a mid-scale flow loop, called thin channel flow cell, that enables the simulation of high flow velocities (high shear stress). Linear polarization resistance and weight loss measurements were performed to assess the inhibitors ability to decrease the general corrosion rate, while scanning electron microscopy was used for surface analysis. The occurrence of localized corrosion was evaluated by means of profilometry analysis. All the inhibitors tested showed excellent inhibition properties for general corrosion. However, localized corrosion as high as 100 mm/y was observed in some cases.

Key words: inhibition, CO2 corrosion, localized corrosion, carbon steel

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