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Micellization And Inhibition Efficiency

Picture for Micellization And Inhibition Efficiency
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Product Number: 51321-16872-SG
Author: Yi He; Shuai Ren; Zined Belarbi; Xi Wang; David Young; Marc Singer; Maalek Mohamed-Said
Publication Date: 2021
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$20.00
$20.00

Long-distance transmission of oil is usually carried out in large-diameter steel pipelines; water present
therein may cause severe internal corrosion. An effective method of mitigating such corrosion is to inject
organic corrosion inhibitors (CIs). Their surface adsorption, via heteroatom functionalities, can markedly
enhance the corrosion resistance of metals. In this study, three CI model compounds with the same alkyl
tail length (-C14H29), specifically benzyl-dimethyl-tetradecyl-ammonium (BDTA),
tetradecyltetrahydropyrimidinium (TTHP) and tetradecylphosphate ester (TPE) were synthesized, their
purities being determined using nuclear magnetic resonance spectroscopy (NMR). The critical micelle
concentrations (CMCs) of each compound were measured using surface tensiometry (Du Noüy ring) and
fluorescence spectroscopy techniques, and differences were found between these indirect and direct
methods. In addition, linear polarization resistance was used to determine inhibition efficiencies (IEs) for
carbon steel immersed in a NaCl electrolyte saturated with CO2. CI surface saturation concentrations,
with maximum IEs, were compared with the determined CMCs. Excellent IEs were observed at
concentrations of TTHP and TPE significantly less than their CMCs. These results imply that there is no
direct link between CMC and corrosion efficiency and that the selection of the appropriate CI concentration for an industrial application should not be based solely on CMC. Further work is ongoing to confirm this absence of correlation at higher temperature (T>30°C) and different water chemistry.

Long-distance transmission of oil is usually carried out in large-diameter steel pipelines; water present
therein may cause severe internal corrosion. An effective method of mitigating such corrosion is to inject
organic corrosion inhibitors (CIs). Their surface adsorption, via heteroatom functionalities, can markedly
enhance the corrosion resistance of metals. In this study, three CI model compounds with the same alkyl
tail length (-C14H29), specifically benzyl-dimethyl-tetradecyl-ammonium (BDTA),
tetradecyltetrahydropyrimidinium (TTHP) and tetradecylphosphate ester (TPE) were synthesized, their
purities being determined using nuclear magnetic resonance spectroscopy (NMR). The critical micelle
concentrations (CMCs) of each compound were measured using surface tensiometry (Du Noüy ring) and
fluorescence spectroscopy techniques, and differences were found between these indirect and direct
methods. In addition, linear polarization resistance was used to determine inhibition efficiencies (IEs) for
carbon steel immersed in a NaCl electrolyte saturated with CO2. CI surface saturation concentrations,
with maximum IEs, were compared with the determined CMCs. Excellent IEs were observed at
concentrations of TTHP and TPE significantly less than their CMCs. These results imply that there is no
direct link between CMC and corrosion efficiency and that the selection of the appropriate CI concentration for an industrial application should not be based solely on CMC. Further work is ongoing to confirm this absence of correlation at higher temperature (T>30°C) and different water chemistry.

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Effect Of Organic Solvent On Corrosion Inhibition of Mild Steel in CO2 environment
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Effect Of Organic Solvent On Corrosion Inhibition of Mild Steel in CO2 environment

Product Number: 51322-17942-SG
Author: Xi Wang, Shuai Ren, Yi He, David Young, Marc Singer, Maalek Mohamed-Said, and Sheyla Camperos
Publication Date: 2022
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Corrosion inhibitors is commonly used to combat internal corrosion of mild steel pipelines in oil and gas production and transmission systems. Since the corrosive environment and flow conditions could vary in different fields, small scale laboratory testing is essential to determine the effectiveness of inhibitors in specific corrosive environments. To ensure the accuracy of inhibitor dosage in a small-scale lab setup, the inhibitor often needs to be pre-diluted before addition to the test electrolyte. This pre-dilution has the potential to lead to experimental errors. However, little information can be found about pre-dilution steps, and their influence on inhibition phenomena, in the open literature. 
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Available for download

05114 Localized Corrosion Resulting from Inhibition in Oil and Gas Production Environments Containing Acetate

Product Number: 51300-05114-SG
ISBN: 05114 2005 CP
Author: Michael W. Joosten, Karen Cloke, George D. Harris, Roger Hudgins, and Danny A. Daniels, ConocoPhilli
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Picture for Corrosion Inhibition in Oil/Water Environments
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51315-5819-Corrosion Inhibition in Oil/Water Environments

Product Number: 51315-5819-SG
ISBN: 5819 2015 CP
Author: Michael W. Keller
Publication Date: 2015
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