Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim

The objective of this thesis is to investigate the performance of newly synthesized substituted benzylidene Schiff bases as corrosion inhibitors of mild steel in 1 M HCl at 25°C. To accomplish this intention, a series of (E)-N’-benzylidene-N⁴-phenylbenzene-1,4-diamine Schiff bases that contain diffe...

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Main Author:	Nor Hashim, Nor Zakiah
Format:	Book Section
Language:	English
Published:	Institute of Graduate Studies, UiTM 2016
Subjects:	Malaysia
Online Access:	http://ir.uitm.edu.my/id/eprint/19423/ http://ir.uitm.edu.my/id/eprint/19423/1/ABS_NOR%20ZAKIAH%20NOR%20HASHIM%20TDRA%20VOL%209%20IGS%2016.pdf

id	uitm-19423
recordtype	eprints
spelling	uitm-194232018-06-11T06:47:43Z http://ir.uitm.edu.my/id/eprint/19423/ Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim Nor Hashim, Nor Zakiah Malaysia The objective of this thesis is to investigate the performance of newly synthesized substituted benzylidene Schiff bases as corrosion inhibitors of mild steel in 1 M HCl at 25°C. To accomplish this intention, a series of (E)-N’-benzylidene-N⁴-phenylbenzene-1,4-diamine Schiff bases that contain different substituent groups at para position of benzylidene were synthesized and characterized via physical and spectroscopic analysis. The azomethine double bond (C=N) infrared spectra found for the Schiff bases are at around 1590-1604 cm⁻¹. From ¹H Nuclear Magnetic Spectroscopy (NMR) spectra, the azomethine proton (singlet) shifted in the range of δ 8.634-8.531 ppm, while the peaks at around δ 157.32-155.82 ppm found in ¹³C NMR spectra are assigned for azomethine carbon. The corrosion inhibition performance of N-phenyl-1,4-phenylenediamine (NPPD), (E)-N¹-benzylidene-N⁴-phenylbenzene-1,4-diamine (K1), N-[(E)-4- chlorobenzylidene]-N’-phenylbenzene-1,4-diamine (K2) and N-[(E)-4- methoxybenzylidene]-N’-phenylbenzene-1,4-diamine (K3) was measured in 1 M HCl using electrochemical methods which are polarization, Linear Polarization (LPR) and Electrochemical Impedance Spectroscopy (EIS). The analysis of substrate’s surface via Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS) was employed to determine the Schiff base adsorption behaviour on the surface of mild steel in the acidic solution. The electrochemical results revealed that the corrosion inhibition efficiencies of the Schiff bases are higher and achieved up to 96.0% as found for K2, thus more effective than the other Schiff base in the series, and the parent amine of NPPD. The adsorption of inhibitors at the metal-solution interface are well described based on Langmuir adsorption isotherm because R² and slope values are almost to the value of 1… Institute of Graduate Studies, UiTM 2016 Book Section PeerReviewed text en http://ir.uitm.edu.my/id/eprint/19423/1/ABS_NOR%20ZAKIAH%20NOR%20HASHIM%20TDRA%20VOL%209%20IGS%2016.pdf Nor Hashim, Nor Zakiah (2016) Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim. In: The Doctoral Research Abstracts. IGS Biannual Publication, 9 (9). Institute of Graduate Studies, UiTM, Shah Alam.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Malaysia
spellingShingle	Malaysia Nor Hashim, Nor Zakiah Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
description	The objective of this thesis is to investigate the performance of newly synthesized substituted benzylidene Schiff bases as corrosion inhibitors of mild steel in 1 M HCl at 25°C. To accomplish this intention, a series of (E)-N’-benzylidene-N⁴-phenylbenzene-1,4-diamine Schiff bases that contain different substituent groups at para position of benzylidene were synthesized and characterized via physical and spectroscopic analysis. The azomethine double bond (C=N) infrared spectra found for the Schiff bases are at around 1590-1604 cm⁻¹. From ¹H Nuclear Magnetic Spectroscopy (NMR) spectra, the azomethine proton (singlet) shifted in the range of δ 8.634-8.531 ppm, while the peaks at around δ 157.32-155.82 ppm found in ¹³C NMR spectra are assigned for azomethine carbon. The corrosion inhibition performance of N-phenyl-1,4-phenylenediamine (NPPD), (E)-N¹-benzylidene-N⁴-phenylbenzene-1,4-diamine (K1), N-[(E)-4- chlorobenzylidene]-N’-phenylbenzene-1,4-diamine (K2) and N-[(E)-4- methoxybenzylidene]-N’-phenylbenzene-1,4-diamine (K3) was measured in 1 M HCl using electrochemical methods which are polarization, Linear Polarization (LPR) and Electrochemical Impedance Spectroscopy (EIS). The analysis of substrate’s surface via Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS) was employed to determine the Schiff base adsorption behaviour on the surface of mild steel in the acidic solution. The electrochemical results revealed that the corrosion inhibition efficiencies of the Schiff bases are higher and achieved up to 96.0% as found for K2, thus more effective than the other Schiff base in the series, and the parent amine of NPPD. The adsorption of inhibitors at the metal-solution interface are well described based on Langmuir adsorption isotherm because R² and slope values are almost to the value of 1…
format	Book Section
author	Nor Hashim, Nor Zakiah
author_facet	Nor Hashim, Nor Zakiah
author_sort	Nor Hashim, Nor Zakiah
title	Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
title_short	Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
title_full	Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
title_fullStr	Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
title_full_unstemmed	Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim
title_sort	studies on the adsorption and corrosion inhibition of substituted benzylidene schiff bases on mild steel in 1 m hcl / nor zakiah nor hashim
publisher	Institute of Graduate Studies, UiTM
publishDate	2016
url	http://ir.uitm.edu.my/id/eprint/19423/ http://ir.uitm.edu.my/id/eprint/19423/1/ABS_NOR%20ZAKIAH%20NOR%20HASHIM%20TDRA%20VOL%209%20IGS%2016.pdf
first_indexed	2023-09-18T23:02:32Z
last_indexed	2023-09-18T23:02:32Z
_version_	1777418268716302336

Studies on the adsorption and corrosion inhibition of substituted benzylidene Schiff bases on mild steel in 1 M HCl / Nor Zakiah Nor Hashim

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