Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres

The corrosion behaviour of PM Al composite will be affected by the presence of alloying element and reinforcing phase in the composite. This studies were focused on the influence of magnesium addition and alumina Saffil™ short fibres reinforcement on corrosion behaviour of PM AMCs. PM Al composite...

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Main Author:	Normah, Cheman
Format:	Thesis
Language:	English
Subjects:	Corrosion Alumina Saffil short fibres Metal matrix composites (MMCs) Aluminium matrix composites (ACMs) Powder metallurgy (PM)
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/2/Full%20Text.pdf
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spelling	my-unimap-98772010-10-18T13:07:08Z Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres Normah, Cheman The corrosion behaviour of PM Al composite will be affected by the presence of alloying element and reinforcing phase in the composite. This studies were focused on the influence of magnesium addition and alumina Saffil™ short fibres reinforcement on corrosion behaviour of PM AMCs. PM Al composite and PM Al-Mg composite were fabricated from flaky aluminium powder, granular magnesium and alumina Saffil™ short fibres with an average particle size of 70.58 µm, 273.41 µm and 16.71 μm, respectively. The experimental parameter were maintained the content of magnesium powder (ranging from 0.5 wt% to 3.0 wt%) and alumina Saffil™ short fibres (ranging from 5 wt% to 25 wt%) . The samples were fabricated by using 200 MPa uniaxial pressing and sintered in argon atmosphera for 6 hours. Sintered samples were characterized by using SEM, density and porosity analysis and Vickers hardness testing. The optimum samples were tested in corrosion properties by using electrochemical test and immersion test. Both experiment using 3.5 wt% NaCl as corrosion environment. Electrochemical test was carried out with apply potentiostat Gamry G300 to create Tafel plot and polarization curve. The immersion test was carried out for 28, 56 and 84 days. Weight loss curves were acquired from immersion test results. Photomicrographs of samples were examined using scanning electron microscopy (SEM). The elemental composition of sample was analyzed by Energy dispersive X-ray (EDX) analysis. The presence of an oxide phases were verified by X-ray diffraction analysis (XRD). Experimental results showed the wetability between alumina Saffil™ short fibres and Al matrix have been improved by adding magnesium in the PM Al composite. PM Al – 15 wt% Al2O3 and PM Al – 2 wt% Mg - 15 wt% Al2O3 were identified as the optimum sample. The corrosion rate of PM Al composite was decreased from 67.69 µm/year to 0.66 µm/year when 2 wt% of magnesium was added in PM Al-Mg composite. SEM photomicrograph observed that pitting was localized surrounding the magnesium constituents which occur randomly throughout the surface of PM Al-Mg composite. XRD analysis revealed that aluminum oxide (δ-Al Al1.67O4), aluminium hydroxide (Al (OH)3) and aluminium oxide (α-Al2O3) phases were detected in oxide film. The critical current density (Icrit) of PM Al composite is lower than PM Al-Mg composite which is 2.0 x 10-1 A/cm2 and 4.0 x10-1 A/cm2, respectively. Magnesium is used as inhibitor in corrosion behaviour of PM Al-Mg composite have been changed and protected with a stable formation of oxide film. The corrosion resistance of PM Al-composite was decreased with the presence of alumina Saffil™ short fibres in composite due to discontinuities in oxide film provided the corrosion initiated in sample. Universiti Malaysia Perlis 2009 Thesis en http://dspace.unimap.edu.my/123456789/9877 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/1/Page%201-24.pdf 895a5efe1199a699afe23e6d018c44d7 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/2/Full%20Text.pdf 8f58d5c532dbdec489c53084c4ab64f7 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/3/license.txt 50c00fba5afdff38ac078261728b4ac3 Corrosion Alumina Saffil short fibres Metal matrix composites (MMCs) Aluminium matrix composites (ACMs) Powder metallurgy (PM) School of Materials Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
topic	Corrosion Alumina Saffil short fibres Metal matrix composites (MMCs) Aluminium matrix composites (ACMs) Powder metallurgy (PM)
spellingShingle	Corrosion Alumina Saffil short fibres Metal matrix composites (MMCs) Aluminium matrix composites (ACMs) Powder metallurgy (PM) Normah, Cheman Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
description	The corrosion behaviour of PM Al composite will be affected by the presence of alloying element and reinforcing phase in the composite. This studies were focused on the influence of magnesium addition and alumina Saffil™ short fibres reinforcement on corrosion behaviour of PM AMCs. PM Al composite and PM Al-Mg composite were fabricated from flaky aluminium powder, granular magnesium and alumina Saffil™ short fibres with an average particle size of 70.58 µm, 273.41 µm and 16.71 μm, respectively. The experimental parameter were maintained the content of magnesium powder (ranging from 0.5 wt% to 3.0 wt%) and alumina Saffil™ short fibres (ranging from 5 wt% to 25 wt%) . The samples were fabricated by using 200 MPa uniaxial pressing and sintered in argon atmosphera for 6 hours. Sintered samples were characterized by using SEM, density and porosity analysis and Vickers hardness testing. The optimum samples were tested in corrosion properties by using electrochemical test and immersion test. Both experiment using 3.5 wt% NaCl as corrosion environment. Electrochemical test was carried out with apply potentiostat Gamry G300 to create Tafel plot and polarization curve. The immersion test was carried out for 28, 56 and 84 days. Weight loss curves were acquired from immersion test results. Photomicrographs of samples were examined using scanning electron microscopy (SEM). The elemental composition of sample was analyzed by Energy dispersive X-ray (EDX) analysis. The presence of an oxide phases were verified by X-ray diffraction analysis (XRD). Experimental results showed the wetability between alumina Saffil™ short fibres and Al matrix have been improved by adding magnesium in the PM Al composite. PM Al – 15 wt% Al2O3 and PM Al – 2 wt% Mg - 15 wt% Al2O3 were identified as the optimum sample. The corrosion rate of PM Al composite was decreased from 67.69 µm/year to 0.66 µm/year when 2 wt% of magnesium was added in PM Al-Mg composite. SEM photomicrograph observed that pitting was localized surrounding the magnesium constituents which occur randomly throughout the surface of PM Al-Mg composite. XRD analysis revealed that aluminum oxide (δ-Al Al1.67O4), aluminium hydroxide (Al (OH)3) and aluminium oxide (α-Al2O3) phases were detected in oxide film. The critical current density (Icrit) of PM Al composite is lower than PM Al-Mg composite which is 2.0 x 10-1 A/cm2 and 4.0 x10-1 A/cm2, respectively. Magnesium is used as inhibitor in corrosion behaviour of PM Al-Mg composite have been changed and protected with a stable formation of oxide film. The corrosion resistance of PM Al-composite was decreased with the presence of alumina Saffil™ short fibres in composite due to discontinuities in oxide film provided the corrosion initiated in sample.
format	Thesis
author	Normah, Cheman
author_facet	Normah, Cheman
author_sort	Normah, Cheman
title	Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
title_short	Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
title_full	Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
title_fullStr	Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
title_full_unstemmed	Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres
title_sort	corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina saffil™ short fibres
granting_institution	Universiti Malaysia Perlis
granting_department	School of Materials Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/9877/2/Full%20Text.pdf
_version_	1747836780776783872

Corrosion behaviour on powder metallurgy aluminium matrix composite reinforced with alumina Saffil™ short fibres

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