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Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai

Aluminium (Al) is an amazing material due to its low cost, lightweight and corrosion resistance. However, Al is easily corroded when exposed in solution containing pitting agents. Suitable corrosion inhibitor should be used and palm olein has a promising characteristics. For this work, formulation o...

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Main Author: Jai, Junaidah
Format: Thesis
Language:English
Published: 2010
Subjects:
Corrosion and anti-corrosives
Metallurgy
Online Access:https://ir.uitm.edu.my/id/eprint/65280/1/65280.pdf
https://ir.uitm.edu.my/id/eprint/65280/
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spelling my.uitm.ir.652802023-01-05T02:01:44Z https://ir.uitm.edu.my/id/eprint/65280/ Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai Jai, Junaidah Corrosion and anti-corrosives Metallurgy Aluminium (Al) is an amazing material due to its low cost, lightweight and corrosion resistance. However, Al is easily corroded when exposed in solution containing pitting agents. Suitable corrosion inhibitor should be used and palm olein has a promising characteristics. For this work, formulation of palm olein (PO) as corrosion inhibitor for Al in aqueous solution was developed. Tween 20, hexane and diethyl triamine were used as the additives and the formulated inhibitor was labeled as POT20HA. The X-ray diffractometer (XRD) spectrum revealed that the POT20HA was an amide compound. The inhibition efficiency (IE) and behaviour of the POT20HA were determined through weight loss (WL), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). For the tests, Al 6061 was immersed in 1 M HC1 solution at different temperatures of 26°C (299 K), 50°C (323 K) and 70°C (343 K) with different concentrations of POT20HA of 0, 0.03, 0.07, 0.10, 0.13 and 0.17 M. Scanning Electron Microscopy (SEM) coupled with Energy Dispersion X-ray analysis (EDAX) was used to examine the morphology of the corroded Al 6061. The WL test had shown that the IE increased with increasing concentration of POT20HA at all temperatures under study. However, the IE decreased with increasing of temperature and immersion time. The PP study revealed the POT20HA as a mixed type of inhibitor, which is capable of protecting both the anodic and cathodic reactions of the corrosion process. The EIS study had shown the ability of POT20HA in forming protective passive film on Al 6061 surface. The thickness of the passive film increased accordingly with the increase in concentration but decreased with increasing temperature. The corrosion tests showed that POT20HA adsorbed on the Al 6061 surface through physical adsorption according to the Langmuir isotherm relationship. The adsorption mechanism of POT20HA on the Al 6061 was through protonation of micelles by the HC1 solution. The protonated micelles, with the presence of CI" ions, adsorbed both on the cathodic and anodic sides of the corroding surface. Performance test had shown that the POT20HA has performed as an anticorrosion with glycerin as a coolant in an Al car radiator. 2010 Thesis NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/65280/1/65280.pdf Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai. (2010) PhD thesis, thesis, Universiti Teknologi MARA (UiTM).
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
language English
topic Corrosion and anti-corrosives
Metallurgy
spellingShingle Corrosion and anti-corrosives
Metallurgy
Jai, Junaidah
Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
description Aluminium (Al) is an amazing material due to its low cost, lightweight and corrosion resistance. However, Al is easily corroded when exposed in solution containing pitting agents. Suitable corrosion inhibitor should be used and palm olein has a promising characteristics. For this work, formulation of palm olein (PO) as corrosion inhibitor for Al in aqueous solution was developed. Tween 20, hexane and diethyl triamine were used as the additives and the formulated inhibitor was labeled as POT20HA. The X-ray diffractometer (XRD) spectrum revealed that the POT20HA was an amide compound. The inhibition efficiency (IE) and behaviour of the POT20HA were determined through weight loss (WL), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). For the tests, Al 6061 was immersed in 1 M HC1 solution at different temperatures of 26°C (299 K), 50°C (323 K) and 70°C (343 K) with different concentrations of POT20HA of 0, 0.03, 0.07, 0.10, 0.13 and 0.17 M. Scanning Electron Microscopy (SEM) coupled with Energy Dispersion X-ray analysis (EDAX) was used to examine the morphology of the corroded Al 6061. The WL test had shown that the IE increased with increasing concentration of POT20HA at all temperatures under study. However, the IE decreased with increasing of temperature and immersion time. The PP study revealed the POT20HA as a mixed type of inhibitor, which is capable of protecting both the anodic and cathodic reactions of the corrosion process. The EIS study had shown the ability of POT20HA in forming protective passive film on Al 6061 surface. The thickness of the passive film increased accordingly with the increase in concentration but decreased with increasing temperature. The corrosion tests showed that POT20HA adsorbed on the Al 6061 surface through physical adsorption according to the Langmuir isotherm relationship. The adsorption mechanism of POT20HA on the Al 6061 was through protonation of micelles by the HC1 solution. The protonated micelles, with the presence of CI" ions, adsorbed both on the cathodic and anodic sides of the corroding surface. Performance test had shown that the POT20HA has performed as an anticorrosion with glycerin as a coolant in an Al car radiator.
format Thesis
author Jai, Junaidah
author_facet Jai, Junaidah
author_sort Jai, Junaidah
title Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
title_short Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
title_full Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
title_fullStr Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
title_full_unstemmed Development of palm olein as a corrosion inhibitor for aluminium alloy / Junaidah Jai
title_sort development of palm olein as a corrosion inhibitor for aluminium alloy / junaidah jai
publishDate 2010
url https://ir.uitm.edu.my/id/eprint/65280/1/65280.pdf
https://ir.uitm.edu.my/id/eprint/65280/
_version_ 1754533154862923776
score 13.211869

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