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Cationic Gemini Surfactants with a Bipyridyl Spacer as Corrosion Inhibitors for Carbon Steel.

ABSTRACT: In this work, cationic Gemini surfactants with different alkyl chain lengths (n = 8, 10, and 12) and a bipyridyl spacer were synthesized and tested as corrosion inhibitors for carbon steel in 1 M HCl solution. The corrosion inhibition efficiency was determined by weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. Results showed that such three inhibitors could effectively inhibit the corrosion of carbon steel in 1 M HCl solution, especially at their low concentrations, while the carbon chain length of Geminis used played a negligible role in the inhibition efficiency. Scanning electron microscopy/energy dispersive X-ray analysis observations demonstrated the formation of a protective inhibitor layer on the carbon steel surface. Additionally, the adsorption of the inhibitor molecules on the carbon steel surface was found to obey the Langmuir isotherm.

SUBMITTER: Feng L

PROVIDER: S-EPMC6643845 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Cationic Gemini Surfactants with a Bipyridyl Spacer as Corrosion Inhibitors for Carbon Steel.

Feng Liwei L Yin Chengxian C Zhang Huali H Li Yufei Y Song Xuehua X Chen Qibin Q Liu Honglai H

ACS omega 20181231 12

In this work, cationic Gemini surfactants with different alkyl chain lengths (<i>n</i> = 8, 10, and 12) and a bipyridyl spacer were synthesized and tested as corrosion inhibitors for carbon steel in 1 M HCl solution. The corrosion inhibition efficiency was determined by weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. Results showed that such three inhibitors could effectively inhibit the corrosion of carbon steel in 1 M HCl solution, especially ...[more]

PMID: 31458464

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Project description:The present work highlights the effect of urea on solvation dynamics and the rotational relaxation of Coumarin 480 (C-480) in the Stern layer of aqueous micelles of cationic gemini surfactants, 12-4(OH) n -12 (n = 0, 1, 2). UV-visible absorption, steady-state fluorescence and fluorescence anisotropy, time-resolved fluorescence and fluorescence anisotropy, and dynamic light scattering measurements have been carried out for this study. The formation of micelles becomes disfavored in the presence of urea at high concentration. Solvation dynamics is bimodal in nature with fast solvation as a major component. The average solvation time increases, reaches a maximum, and then decreases with increasing concentration of urea because the degree of counterion dissociation also follows the same order with the addition of urea in the micellar solution. With increased degree of counterion dissociation, the extent of clustering of water molecules is increased, resulting in slower solvation process. The -OH group present in the spacer group of gemini surfactant controls the rate of solvation by shielding the water molecules from the probe molecules forming hydrogen bond. The microviscosity of micelles is decreased with increasing concentration of urea, as a result of which the rotational relaxation process becomes faster. In the presence of the -OH group in the spacer group, the microviscosity of micelles is enhanced, resulting in longer rotational relaxation time. Rotational relaxation process is bimodal in nature with the major contribution from the fast component to the fluorescence depolarization. Slow rotational relaxation is mainly due to the lateral diffusion of C-480 molecules along the surface of the micelle. The tumbling motion of the micelle as a whole is much slower than the lateral diffusion of C-480. Wobbling motion of C-480 becomes faster with increasing concentration of urea as a result of decreased microviscosity of micelles. The alignment of C-480 molecules in micelles might change with changing microviscosity.

Dataset Information

Cationic Gemini Surfactants with a Bipyridyl Spacer as Corrosion Inhibitors for Carbon Steel.

Publications

Cationic Gemini Surfactants with a Bipyridyl Spacer as Corrosion Inhibitors for Carbon Steel.

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