Cover Image

Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract

The inhibitive action of the extract of Curcuma longa or generally known as turmeric for mild steel corrosion inhibitor in 1 M HCl solution was investigated. The effect of nine solvent systems (based on polarity) on the solubility of Curcuma longa has been studied. It was revealed that the Curcuma l...

Full description

Saved in:
Bibliographic Details
Main Author: Kairi, Nurul Izni
Format: Thesis
Language:English
Published: 2013
Subjects:
QD1-999 Chemistry
Online Access:http://eprints.usm.my/45805/1/NURUL%20IZZNI24.pdf
http://eprints.usm.my/45805/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.usm.eprints.45805
record_format eprints
spelling my.usm.eprints.45805 http://eprints.usm.my/45805/ Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract Kairi, Nurul Izni QD1-999 Chemistry The inhibitive action of the extract of Curcuma longa or generally known as turmeric for mild steel corrosion inhibitor in 1 M HCl solution was investigated. The effect of nine solvent systems (based on polarity) on the solubility of Curcuma longa has been studied. It was revealed that the Curcuma longa extracted with 95% aqueous ethanol gave the highest solubility and extraction yield. Characterization studies have been conducted to determine the curcumin content which is the active ingredient. Fourier transform infrared (FTIR) spectroscopy results suggest the presence of important functional groups that can fulfil the requirement as a potent organic corrosion inhibitor. The experimental findings based on the maximum absorption (λmax) of the Curcuma longa extract from the UV-Visible (UV-Vis) spectroscopy gives strong evidence on the presence of curcumin. The analysis of curcuminoids by means of reversed phase liquid chromatography mass spectrometry (LCMS) using C18 column have shown that curcumin, demethoxycurcumin (DMC) and bisdemethoxycurcumin (BDMC) were separated. The effect of Curcuma longa extract and standard curcumin as reference were investigated as corrosion inhibitors for mild steel in acidic media. The Curcuma longa extract exhibited 70% corrosion inhibition efficiency at 80 ppm concentration. Potentiodynamic polarization measurement revealed that the inhibitors behave as mixed type inhibitor, promoting retardation of both anodic and cathodic reactions. The electrochemical impedance spectroscopy (EIS) revealed that the charge transfer was the main controlling factor of the corrosion reaction. From the potential of zero charge (PZC) measurement, the negatively charged metal surface might be responsible for the electrostatic adsorption of the protonated molecules. 2013-11 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/45805/1/NURUL%20IZZNI24.pdf Kairi, Nurul Izni (2013) Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract. Masters thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic QD1-999 Chemistry
spellingShingle QD1-999 Chemistry
Kairi, Nurul Izni
Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
description The inhibitive action of the extract of Curcuma longa or generally known as turmeric for mild steel corrosion inhibitor in 1 M HCl solution was investigated. The effect of nine solvent systems (based on polarity) on the solubility of Curcuma longa has been studied. It was revealed that the Curcuma longa extracted with 95% aqueous ethanol gave the highest solubility and extraction yield. Characterization studies have been conducted to determine the curcumin content which is the active ingredient. Fourier transform infrared (FTIR) spectroscopy results suggest the presence of important functional groups that can fulfil the requirement as a potent organic corrosion inhibitor. The experimental findings based on the maximum absorption (λmax) of the Curcuma longa extract from the UV-Visible (UV-Vis) spectroscopy gives strong evidence on the presence of curcumin. The analysis of curcuminoids by means of reversed phase liquid chromatography mass spectrometry (LCMS) using C18 column have shown that curcumin, demethoxycurcumin (DMC) and bisdemethoxycurcumin (BDMC) were separated. The effect of Curcuma longa extract and standard curcumin as reference were investigated as corrosion inhibitors for mild steel in acidic media. The Curcuma longa extract exhibited 70% corrosion inhibition efficiency at 80 ppm concentration. Potentiodynamic polarization measurement revealed that the inhibitors behave as mixed type inhibitor, promoting retardation of both anodic and cathodic reactions. The electrochemical impedance spectroscopy (EIS) revealed that the charge transfer was the main controlling factor of the corrosion reaction. From the potential of zero charge (PZC) measurement, the negatively charged metal surface might be responsible for the electrostatic adsorption of the protonated molecules.
format Thesis
author Kairi, Nurul Izni
author_facet Kairi, Nurul Izni
author_sort Kairi, Nurul Izni
title Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
title_short Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
title_full Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
title_fullStr Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
title_full_unstemmed Corrosion Inhibition Of Mild Steel In 1 M Hcl Solution By Curcuma Longa Rhizome Extract
title_sort corrosion inhibition of mild steel in 1 m hcl solution by curcuma longa rhizome extract
publishDate 2013
url http://eprints.usm.my/45805/1/NURUL%20IZZNI24.pdf
http://eprints.usm.my/45805/
_version_ 1651867899833352192
score 13.211869

Similar Items