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Investigation Of Inhibitor Adsorption Mechanism By In Situ Tapping Mode Atomic Force Microscopy

Picture for Investigation Of Inhibitor Adsorption Mechanism By In Situ Tapping Mode Atomic Force Microscopy
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Product Number: 51321-16610-SG
Author: H. Wang/ B. Brown/ S. Nesic/ A. Pailleret
Publication Date: 2021
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Inhibition of internal corrosion is essential for assuring asset integrity of oil and gas transportation pipelines. Among the various types of inhibitors, the organic corrosion inhibitors are the most widely used in oilfield applications. Consequently, it is necessary to understand the adsorption mechanism and corrosion inhibition capabilities of organic inhibitors. Although the corrosion inhibition mechanisms of organic inhibitors have been extensively investigated by electrochemistry analysis, the adsorption modes and film properties of corrosion inhibitors have rarely been studied due to the limitation of localized surface characterization techniques. The application of atomic force microscopy (AFM) technique can achieve direct monitoring of microscopic inhibitor adsorption behaviors and compensate the deficiencies in traditional electrochemical measurements. Some previous research have studied the adsorption kinetics and growth mechanism of surfactant layers on mica surface with ex-situ AFM, which may bring distortion on the obtained layer structures due to the removal of inhibitor solutions. In this present study, in situ tapping mode AFM have been used to investigate the adsorption kinetics and molecular orientations of a tetra-decyl-dimethyl-benzyl-ammonium (Q-C14) inhibitor model compound on mica surface as a fundamental study. Analysis of AFM data indicated that Q-C14 inhibitor forms a porous film on mica surface. It is proposed that Q-C14 inhibitor molecules adsorb flatly on mica surface within a few minutes. With the increase of immersion time, inhibitor molecules stand up slowly, forming small and dense holes on the film between 0 to 6 hours. Molecular patches formed at longer exposure time, which led to the appearance of large holes on the film. The adsorption morphology seemed to stabilize after 14 hours of immersion. This fundamental research can provide insights on studying the relationship between inhibitor surface coverage and inhibition efficiency.

Key words: Tapping mode AFM, organic inhibitor, adsorption kinetics, molecular orientation

Inhibition of internal corrosion is essential for assuring asset integrity of oil and gas transportation pipelines. Among the various types of inhibitors, the organic corrosion inhibitors are the most widely used in oilfield applications. Consequently, it is necessary to understand the adsorption mechanism and corrosion inhibition capabilities of organic inhibitors. Although the corrosion inhibition mechanisms of organic inhibitors have been extensively investigated by electrochemistry analysis, the adsorption modes and film properties of corrosion inhibitors have rarely been studied due to the limitation of localized surface characterization techniques. The application of atomic force microscopy (AFM) technique can achieve direct monitoring of microscopic inhibitor adsorption behaviors and compensate the deficiencies in traditional electrochemical measurements. Some previous research have studied the adsorption kinetics and growth mechanism of surfactant layers on mica surface with ex-situ AFM, which may bring distortion on the obtained layer structures due to the removal of inhibitor solutions. In this present study, in situ tapping mode AFM have been used to investigate the adsorption kinetics and molecular orientations of a tetra-decyl-dimethyl-benzyl-ammonium (Q-C14) inhibitor model compound on mica surface as a fundamental study. Analysis of AFM data indicated that Q-C14 inhibitor forms a porous film on mica surface. It is proposed that Q-C14 inhibitor molecules adsorb flatly on mica surface within a few minutes. With the increase of immersion time, inhibitor molecules stand up slowly, forming small and dense holes on the film between 0 to 6 hours. Molecular patches formed at longer exposure time, which led to the appearance of large holes on the film. The adsorption morphology seemed to stabilize after 14 hours of immersion. This fundamental research can provide insights on studying the relationship between inhibitor surface coverage and inhibition efficiency.

Key words: Tapping mode AFM, organic inhibitor, adsorption kinetics, molecular orientation

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