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Relationship between Inhibitor Adsorption and Surfactant Properties:Critical Parameters

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A novel experimental methodology for investigating the relationship between corrosion inhibitor adsorption and micellization processes was developed and implemented using different types of inhibitor molecules have been investigated. The approach involved integrating the following experimental methodologies – Mott-Schottky Cyclic Voltammetry Quartz Crystal Microbalance Surface Tension and Fluorescence SpectroscopyHomologous series of quaternary amines and hydroxyethyl imidazolines were studied and compared to establish the effect of critical parameters such as pH salinity temperature and carbon chain length on the adsorption and micellization process. The two processes have been found to be closely related and depend not only on the surfactant properties (polar head group and carbon chain length) but also on environmental parameters such as temperature pH and ionic strength. Adsorption isotherms and critical micelle concentrations were determined under different solution conditions and were used to calculate thermodynamic constants – Gibbs free energy (ΔG) enthalpy (ΔH) and entropy (ΔS) change associated with the two processes. The correlation of these constants that are related to the active components of these inhibitor molecules and solution conditions can help in developing and characterizing corrosion inhibitors required to be used under challenging conditions in the oil and gas industry.

Product Number: 51319-13245-SG
Author: Ashwini Chandra
Publication Date: 2019
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Picture for Relationship between Inhibitor Adsorption and Surfactant Properties: Part I - Methodology
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51318-11467-Relationship between Inhibitor Adsorption and Surfactant Properties: Part I - Methodology

Product Number: 51318-11467-SG
Author: Ashwini Chandra / William Durnie / Jose Vera / Richard Woollam
Publication Date: 2018
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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.
Picture for Adsorption Desorption Behavior of Water Soluble Film Persistent Corrosion Inhibitor
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Adsorption Desorption Behavior of Water Soluble Film Persistent Corrosion Inhibitor

Product Number: 51319-12984-SG
Author: Sunder Ramachandran
Publication Date: 2019
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Water based corrosion inhibitors have been found that provide longer treatment lives and better protection than similar inhibitors in oil-based formulations. In this paper conventional film persistency tests are presented on a water soluble film persistent corrosion inhibitor. The conventional tests allow comparative evaluation of different corrosion inhibitors. Langmuir adsorption and desorption has been recently used to form a method of evaluating the impact of the loss of availability of a corrosion inhibitor. The adsorption-desorption analysis allowed quantitative assessment of loss of availability. In this paper these studies will be continued on a water soluble corrosion inhibitor that has been previously characterized as film persistent in conventional laboratory tests and field experience. The values of adsorption and desorption will be compared with values with a corrosion inhibitor that is not used in batch treatments. The work will aid quantitative laboratory assessment of film persistency.
Picture for New Synergistic Combination of Additives for the Localized Corrosion Prevention of Capillary and Umbilical Materials during Chemical Injection
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New Synergistic Combination of Additives for the Localized Corrosion Prevention of Capillary and Umbilical Materials during Chemical Injection

Product Number: 51319-13058-SG
Author: Carlos Menendez
Publication Date: 2019
$20.00

The compatibility of neat chemicals when exposed to capillary and umbilical materials during injection is key to the smooth operation of chemical treatment programs in the oilfield and can be catastrophic if a failure occurred in the umbilical string during deepwater operations. The requirement of low viscosity for chemical injection through capillary strings and umbilicals make methanol the solvent of choice in many cases. Products formulated with methanol that contain chlorides and a low amount of water (less than 5 wt %) frequently hinder the ability of stainless steels and corrosion resistant alloys to repassivate. This work describes the development of a synergistic combination of two additives that dramatically improve both the breakdown and the repassivation potentials of such materials like 316L stainless steel and Duplex 2205. Most of the experiments were conducted using cyclic potentiodynamic polarization (CPP) on neat chemicals and verified using long-term neat chemical exposures to various materials to verify the CPP results.
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