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02276 WHY CORROSION INHIBITORS DO NOT PERFORM WELL IN SOME MULTIPHASE CONDITIONS: A MECHANISTIC STUDY

Results of inhibitor performance at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and scanning electrom microscope (SEM) techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor.

Product Number: 51300-02276-SG
ISBN: 02276 2002 CP
Author: Hongbin Wang, Hongwei Wang, Hua Shi, Cheolho Kang, and Paul W. Jepson
Publication Date: 2002
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This paper presents the results and analysis of inhibitor performance of CO2 corrosion at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and SEM techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor at slug flow of Froude number 12. A metal-film-solution model is presented and its electrochemical characteristics are discussed. The electrochemical analysis is consistent with the hydrodynamic analysis that there are large inhibitor-uncovered areas on the steel surface at higher Froude number.

Key words: electrochemical impedance spectroscopy (EIS), charge transfer resistance, capacitance, mass transfer, bubble impact, turbulence, inhibitor film, corrosion product film

This paper presents the results and analysis of inhibitor performance of CO2 corrosion at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and SEM techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor at slug flow of Froude number 12. A metal-film-solution model is presented and its electrochemical characteristics are discussed. The electrochemical analysis is consistent with the hydrodynamic analysis that there are large inhibitor-uncovered areas on the steel surface at higher Froude number.

Key words: electrochemical impedance spectroscopy (EIS), charge transfer resistance, capacitance, mass transfer, bubble impact, turbulence, inhibitor film, corrosion product film

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