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51318-11467-Relationship between Inhibitor Adsorption and Surfactant Properties: Part I - Methodology

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Methodology and approach used to characterize micellization and adsorption related parameters for an individual corrosion inhibitor components; specifically, data for a homologous quaternary amine series.

Product Number: 51318-11467-SG
Author: Ashwini Chandra / William Durnie / Jose Vera / Richard Woollam
Publication Date: 2018
Industry: Science of Corrosion
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A novel experimental methodology for investigating the relationship between corrosion inhibitor adsorption and micellization processes was developed and implemented using typical components of commercially available corrosion inhibitors for oil and gas applications (e.g., quaternary amines, imidazolines).

This paper presents the methodology and approach used to characterize micellization and adsorption related parameters for an individual corrosion inhibitor components; specifically, data for a homologous quaternary amine series is presented in this manuscript.

The micellization phenomenon associated with an inhibitor molecule in aqueous solutions was studied using surface tension measurements and fluorescence spectroscopy. For the same molecule, the adsorption phenomenon onto a platinum surface was studied, using quartz crystal microbalance and electrochemical methods, which included Capacitance vs potential measurements and Cyclic Voltammetry. Micellization and adsorption were found to be closely related. Free energy change associated with adsorption onto the Pt/solution interface was more negative than that associated with the micellization process. The effect of temperature on the adsorption and micellization process was also studied to provide insights into the thermodynamic constants – enthalpy and entropy changes, associated with micellization and adsorption processes. Thermodynamic data could potentially be used to help tailor corrosion inhibitor for specific and / or challenging conditions encountered in oil and gas industry.

The experimental methodology was implemented to investigate different pure components of typical corrosion inhibitors at different environmental conditions (salinity and temperature). Important thermodynamic parameters such as free energy, entropy and enthalpy associated with the adsorption and micellization process were also derived from these studies. This paper will show results obtained with quaternary amine based inhibitor family.

Key words: Corrosion inhibitor, surfactant, micelle, adsorption, micellization, Gibbs free energy

A novel experimental methodology for investigating the relationship between corrosion inhibitor adsorption and micellization processes was developed and implemented using typical components of commercially available corrosion inhibitors for oil and gas applications (e.g., quaternary amines, imidazolines).

This paper presents the methodology and approach used to characterize micellization and adsorption related parameters for an individual corrosion inhibitor components; specifically, data for a homologous quaternary amine series is presented in this manuscript.

The micellization phenomenon associated with an inhibitor molecule in aqueous solutions was studied using surface tension measurements and fluorescence spectroscopy. For the same molecule, the adsorption phenomenon onto a platinum surface was studied, using quartz crystal microbalance and electrochemical methods, which included Capacitance vs potential measurements and Cyclic Voltammetry. Micellization and adsorption were found to be closely related. Free energy change associated with adsorption onto the Pt/solution interface was more negative than that associated with the micellization process. The effect of temperature on the adsorption and micellization process was also studied to provide insights into the thermodynamic constants – enthalpy and entropy changes, associated with micellization and adsorption processes. Thermodynamic data could potentially be used to help tailor corrosion inhibitor for specific and / or challenging conditions encountered in oil and gas industry.

The experimental methodology was implemented to investigate different pure components of typical corrosion inhibitors at different environmental conditions (salinity and temperature). Important thermodynamic parameters such as free energy, entropy and enthalpy associated with the adsorption and micellization process were also derived from these studies. This paper will show results obtained with quaternary amine based inhibitor family.

Key words: Corrosion inhibitor, surfactant, micelle, adsorption, micellization, Gibbs free energy

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Recommended corrosion inhibitor (CI) testing methods and interpretation to assure proper execution of a test program. Associated guidance for CI test program definition testing and management to ensure and improve the integrity of carbon steels applications in our Industry.
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Effect of Temperature on Adsorption Behavior and Corrosion Inhibition Performance of Imidazoline-Type Inhibitor

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In the present study, the effect of temperature on the adsorption/desorption kinetics and thermodynamics of diethylenetriamine talloil fatty acid imidazoline (DETA/TOFA imidazoline) is studied on a gold coated crystal using a quartz crystal microbalance (QCM) in a CO2 saturated 1wt% NaCl aqueous solution.

 
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51317--9721-Use of Micelle Detection for Corrosion Inhibitor Screening

Product Number: 51317--9721-SG
ISBN: 9721 2017 CP
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This paper describes a method of exploiting the critical micelle concentration (CMC) of the corrosion inhibitors to show that the use of CMC can be used as a laboratory screening method for corrosion inhibitor selection.
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