Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel

In this research, three surfactants, namely cetyl trimethyl ammonium bromide (CTAB), sodium lauryl sulfate (SLS) and polysorbate-80 (Tween 80) have been examined as corrosion inhibitors for mild steel in absence and presence of a thiophene derivative (2-methyl thiophene) in 2 M hydrochloric acid (HC...

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Main Author:	Ibrahim, Nor Syaidah
Format:	Thesis
Language:	English
Published:	2019
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/102118/1/NorSyaidaPhDFS2019.pdf.pdf
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spelling	my-utm-ep.1021182023-08-05T02:38:11Z Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel 2019 Ibrahim, Nor Syaidah QD Chemistry In this research, three surfactants, namely cetyl trimethyl ammonium bromide (CTAB), sodium lauryl sulfate (SLS) and polysorbate-80 (Tween 80) have been examined as corrosion inhibitors for mild steel in absence and presence of a thiophene derivative (2-methyl thiophene) in 2 M hydrochloric acid (HCl). The inhibition action was investigated through weight loss, potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS). The morphology before and after placing mild steel in the corrosive media was studied by scanning electron microscopy (SEM). The inhibition efficiencies of these inhibitors were found to be depended on surfactant concentration, immersion time and temperature. Adsorption isotherm was tested with Langmuir, Freundlich and Temkin models. It was found that the adsorption of surfactants CTAB/SLS/Tween 80 in absence and presence of 2-methyl thiophene on mild steel surface fitted best to the Langmuir adsorption isotherm. From the polarization curve, the inhibition of surfactants in presence of 2-methyl thiophene was observed to be a mixed type. The interactive effects of inhibitor immersion time, temperature and concentration were optimized for maximum response of inhibition efficiency using Response Surface Methodology (RSM) based on Historical Data. The potential of zero charge (PZC) at the metal-solution interface was determined for surfactants in absence and presence of 2-methyl thiophene to provide the mechanism of inhibition. The positive value of Antropov’s “rational” corrosion potential (Er) for all the surfactants with respect to potential of zero charge (EPZC) suggested that mild steel surface is positively charged at open circuit potential in the presence of these inhibitors. So, the most efficient surfactant in presence of 2-methyl thiophene as corrosion inhibitor follows this sequence: SLS > CTAB > Tween 80. 2019 Thesis http://eprints.utm.my/id/eprint/102118/ http://eprints.utm.my/id/eprint/102118/1/NorSyaidaPhDFS2019.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:145998 phd doctoral Universiti Teknologi Malaysia Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Ibrahim, Nor Syaidah Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
description	In this research, three surfactants, namely cetyl trimethyl ammonium bromide (CTAB), sodium lauryl sulfate (SLS) and polysorbate-80 (Tween 80) have been examined as corrosion inhibitors for mild steel in absence and presence of a thiophene derivative (2-methyl thiophene) in 2 M hydrochloric acid (HCl). The inhibition action was investigated through weight loss, potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS). The morphology before and after placing mild steel in the corrosive media was studied by scanning electron microscopy (SEM). The inhibition efficiencies of these inhibitors were found to be depended on surfactant concentration, immersion time and temperature. Adsorption isotherm was tested with Langmuir, Freundlich and Temkin models. It was found that the adsorption of surfactants CTAB/SLS/Tween 80 in absence and presence of 2-methyl thiophene on mild steel surface fitted best to the Langmuir adsorption isotherm. From the polarization curve, the inhibition of surfactants in presence of 2-methyl thiophene was observed to be a mixed type. The interactive effects of inhibitor immersion time, temperature and concentration were optimized for maximum response of inhibition efficiency using Response Surface Methodology (RSM) based on Historical Data. The potential of zero charge (PZC) at the metal-solution interface was determined for surfactants in absence and presence of 2-methyl thiophene to provide the mechanism of inhibition. The positive value of Antropov’s “rational” corrosion potential (Er) for all the surfactants with respect to potential of zero charge (EPZC) suggested that mild steel surface is positively charged at open circuit potential in the presence of these inhibitors. So, the most efficient surfactant in presence of 2-methyl thiophene as corrosion inhibitor follows this sequence: SLS > CTAB > Tween 80.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ibrahim, Nor Syaidah
author_facet	Ibrahim, Nor Syaidah
author_sort	Ibrahim, Nor Syaidah
title	Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
title_short	Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
title_full	Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
title_fullStr	Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
title_full_unstemmed	Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
title_sort	corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Science
publishDate	2019
url	http://eprints.utm.my/id/eprint/102118/1/NorSyaidaPhDFS2019.pdf.pdf
_version_	1776100850037424128

Corrosion inhibition studies by surfactants in the presence of 2-methyl thiophene on mild steel

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