Imidazolium,Pyridinium and Dimethyl-Ethylbenzyl Ammonium Derived Compounds as Mixed Corrosion Inhibitors in Acidic Medium |
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Authors: | Manuel E Palomar Crescencio O Olivares-Xometl Natalya V Likhanova Jonathán-Boanerge Pérez-Navarrete |
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Affiliation: | 1.División de Ciencias Básicas e Ingeniería,Universidad Autónoma Metropolitana,Mexico, D.F.,Mexico;2.Facultad de Ingeniería Química,Benemérita Universidad Autónoma de Puebla,Puebla,Mexico;3.Programa de Ingeniería Molecular, Competencia de Química Aplicada,Instituto Mexicano del Petróleo,Mexico, D.F.,Mexico;4.División de Ciencias Básicas e Ingeniería,Universidad Autónoma Metropolitana,Mexico, D.F.,Mexico |
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Abstract: | Seven cationic surfactants: 1-methyl-3-tetradecyl imidazolium bromide, 1-methyl-3-hexadecyl imidazolium bromide, N,N-tetradecyl pyridinium bromide, N,N-hexadecyl pyridinium bromide, N,N-dimethyl-N-ethylbenzyl ammonium bromide, N,N-dimethyl-N-ethylbenzyl ammonium laurate and N,N-dimethyl-N-ethylbenzyl ammonium acetate, were investigated at different doses (10, 25, 50, 100, and 200 ppm) as corrosion inhibitors
for steel grade API 5L X52 in hydrochloric acid 2 M using a weight loss technique, impedance and polarization resistance methods.
The corrosion inhibition of steel grade API 5L X52 of the cationic surfactants was attributed to their molecular structure
(heterocyclic ring, hydrophobic chain length and counterion) that enhances adsorption onto steel surface. The best protective
efficiency of the film was higher than 90% (N,N-Dimethyl-N-ethylbenzyl ammonium acetate). It is important to know how organic inhibitor films grown on the metallic surface in order
to achieve superior corrosion inhibition, hence experimental findings were described by Langmuir adsorption isotherm. The
Electrochemical Impedance Spectroscopy spectrums were fitted by means of the Voigt model. |
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