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Micellization And Inhibition Efficiency

Picture for Micellization And Inhibition Efficiency
Available for download
Product Number: 51321-16872-SG
Author: Yi He; Shuai Ren; Zined Belarbi; Xi Wang; David Young; Marc Singer; Maalek Mohamed-Said
Publication Date: 2021
$0.00
$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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