Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI

Eight derivatives of thiourea namely: 1-cyclohexyl-3-(4-fluorophenyl)thiourea (Ti), 1-(4-fluoro-benzoyl)-3-(4-fluorophenyl)thiourea (T2), 1-(4-fluoro-benzoyl)-3-(4- nitrophenyl)thiourea (T3), 1-(4-chloro-benzoyl)-3-(4-nitrophenyl)thiourea (T4), 1-(4- bromophenyl)-3-(4-chloro-benzoyl)thiourea (T5)...

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Main Author:	Siti Najihah binti Md Hashim
Format:	Thesis
Language:	English
Subjects:	thiourea, polarization, Corrosion and anti-corrosives mild steel.
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spelling	my-usim-ddms-123992024-05-29T04:05:09Z Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI Siti Najihah binti Md Hashim Eight derivatives of thiourea namely: 1-cyclohexyl-3-(4-fluorophenyl)thiourea (Ti), 1-(4-fluoro-benzoyl)-3-(4-fluorophenyl)thiourea (T2), 1-(4-fluoro-benzoyl)-3-(4- nitrophenyl)thiourea (T3), 1-(4-chloro-benzoyl)-3-(4-nitrophenyl)thiourea (T4), 1-(4- bromophenyl)-3-(4-chloro-benzoyl)thiourea (T5), 1-(4-chloro-benzoyl)-3-(4-fluorophenyl) thiourea (T6), 1-(4-chloro-benzoyl)-3-(3-chloro-2-fluoro-phenyl)thiourea (T7), and 1-(4-chloro-benzoyl)-3-(6-chloro-2-fluoro-3-methoxy-phenyl)thiourea (T8), were successfully synthesized and characterized via micro elemental analyzer, FTIR, 1H and 13C NMR spectroscopy methods. From the FTIR spectral data, the compounds are common to have the vibration frequency of stretching of v(N-H) around 3500- 3100 cmi1, v(C=O) around 1660-1720 cm-1, v(C=S) around 680-1440 cm-1 and v(C-N) in the range of 1350-1000 cm-1. Three of the eight compounds which are T6, T7 and T8 were selected for further study on their anticorrosion activity. The inhibition property of the resulted compounds on the corrosion of mild steel in 1M hydrochloric acid has been investigated at room temperature using weight loss, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). It was found that, all the synthesized thiourea derivatives are capable to inhibit the corrosion of mild steel. It was found that the inhibition efficiency increases with inhibitor concentration and maximum efficiency was obtained at concentration 0.0004 M. Among the studied inhibitors, T8 shows the best inhibition efficiency of greater than 90 %. The impedance spectra indicate that the inhibition process was attributed to the formation of an adsorbed film that protects the metal surface against corrosive medium. The potentiodynamic study reveals that the compounds studied acts essentially as mixed type inhibitor which inhibits both the cathodic and anodic parts of the corrosion reaction. Keywords: thiourea, weight loss, polarization, corrosion inhibition, mild steel. Universiti Sains Islam Malaysian 2016-12 Thesis en https://oarep.usim.edu.my/handle/123456789/12399 https://oarep.usim.edu.my/bitstreams/851c7be0-f4fb-4618-a3df-c488c013cd41/download 8a4605be74aa9ea9d79846c1fba20a33 https://oarep.usim.edu.my/bitstreams/a21d02de-3004-457e-845e-3fb0d7bf0c56/download 74e6ea6e83ac4085ce95d70932333abd https://oarep.usim.edu.my/bitstreams/3f48defc-9559-4f03-a596-ce19307a449d/download 9f045d032fd9489b9669fbb4e9b6570c https://oarep.usim.edu.my/bitstreams/9a537738-f256-499d-9d9a-c4690444be4a/download 5e6246b66d21cdadf6ab176909cf0c21 https://oarep.usim.edu.my/bitstreams/f2dba845-228a-4fc3-b691-78a622dcd031/download 2b00a460aa48a5a3ddb59c4f98a2f102 https://oarep.usim.edu.my/bitstreams/f5fbe24a-3ca7-464b-b02f-430caf58fd75/download f70f06b20fb24ab222643e831583e183 https://oarep.usim.edu.my/bitstreams/5b4662da-00e6-44c6-9511-45cdca987ec7/download f2fbd1c9a2f2afec01f68679ae80edf9 https://oarep.usim.edu.my/bitstreams/1edbca77-47b8-4262-a467-4af77e34b3af/download c67054d72cb5fc77c5338a7d1b9d590d https://oarep.usim.edu.my/bitstreams/fb2ddac0-da86-482a-819e-0988919e7385/download 165fbdabdac8d2beb699b615521c83af thiourea, polarization, Corrosion and anti-corrosives mild steel.
institution	Universiti Sains Islam Malaysia
collection	USIM Institutional Repository
language	English
topic	thiourea, polarization, Corrosion and anti-corrosives mild steel.
spellingShingle	thiourea, polarization, Corrosion and anti-corrosives mild steel. Siti Najihah binti Md Hashim Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
description	Eight derivatives of thiourea namely: 1-cyclohexyl-3-(4-fluorophenyl)thiourea (Ti), 1-(4-fluoro-benzoyl)-3-(4-fluorophenyl)thiourea (T2), 1-(4-fluoro-benzoyl)-3-(4- nitrophenyl)thiourea (T3), 1-(4-chloro-benzoyl)-3-(4-nitrophenyl)thiourea (T4), 1-(4- bromophenyl)-3-(4-chloro-benzoyl)thiourea (T5), 1-(4-chloro-benzoyl)-3-(4-fluorophenyl) thiourea (T6), 1-(4-chloro-benzoyl)-3-(3-chloro-2-fluoro-phenyl)thiourea (T7), and 1-(4-chloro-benzoyl)-3-(6-chloro-2-fluoro-3-methoxy-phenyl)thiourea (T8), were successfully synthesized and characterized via micro elemental analyzer, FTIR, 1H and 13C NMR spectroscopy methods. From the FTIR spectral data, the compounds are common to have the vibration frequency of stretching of v(N-H) around 3500- 3100 cmi1, v(C=O) around 1660-1720 cm-1, v(C=S) around 680-1440 cm-1 and v(C-N) in the range of 1350-1000 cm-1. Three of the eight compounds which are T6, T7 and T8 were selected for further study on their anticorrosion activity. The inhibition property of the resulted compounds on the corrosion of mild steel in 1M hydrochloric acid has been investigated at room temperature using weight loss, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). It was found that, all the synthesized thiourea derivatives are capable to inhibit the corrosion of mild steel. It was found that the inhibition efficiency increases with inhibitor concentration and maximum efficiency was obtained at concentration 0.0004 M. Among the studied inhibitors, T8 shows the best inhibition efficiency of greater than 90 %. The impedance spectra indicate that the inhibition process was attributed to the formation of an adsorbed film that protects the metal surface against corrosive medium. The potentiodynamic study reveals that the compounds studied acts essentially as mixed type inhibitor which inhibits both the cathodic and anodic parts of the corrosion reaction. Keywords: thiourea, weight loss, polarization, corrosion inhibition, mild steel.
format	Thesis
author	Siti Najihah binti Md Hashim
author_facet	Siti Najihah binti Md Hashim
author_sort	Siti Najihah binti Md Hashim
title	Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
title_short	Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
title_full	Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
title_fullStr	Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
title_full_unstemmed	Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI
title_sort	synthesis and corrosion inhibition studies of benzoylthiourea derivatives on mild steel in 1.0 m hci
granting_institution	Universiti Sains Islam Malaysian
_version_	1812444762236518400

Synthesis And Corrosion Inhibition Studies Of Benzoylthiourea Derivatives On Mild Steel In 1.0 M HCI

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