Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel

Conducting polymers have recently been studied as a new class of materials for the corrosion protection of metals. Polyaniline (PANI) is the best candidate to perform this function due to its high environmental stability and simple preparation. Polyaniline was synthesized by polymerizing aniline mon...

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Main Author:	A. Ahmed Al-Dulaimi, Ahmed
Format:	Thesis
Language:	English
Published:	2010
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/12282/4/AhmedAhmedDulaimiMFKKKSA2010.pdf
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spelling	my-utm-ep.122822018-05-30T02:49:23Z Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel 2010-04 A. Ahmed Al-Dulaimi, Ahmed TP Chemical technology Conducting polymers have recently been studied as a new class of materials for the corrosion protection of metals. Polyaniline (PANI) is the best candidate to perform this function due to its high environmental stability and simple preparation. Polyaniline was synthesized by polymerizing aniline monomer with various inorganic oxides and with several ratios of phosphoric acid doping. The prepared samples were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction Meter (XRD) and the morphology of these samples was examined using Scanning Electron Microscopy (SEM) and Field Emission Scanning Electron Microscopy (FESEM). Electrical conductivity of the samples was measured using a multimeter. Besides, pigments dispersion stability was observed in ethanol medium at six increasing times (0, 1, 3, 6, 12 and 24 hours). The prepared samples were used as anti-corrosive pigments by blending with commercially available acrylic paint. The blended pigments and acrylic paint were then applied on carbon steel panels by simple dip coating method. The coated steel panels were then dried at room temperature for two days. Once the coatings were fully dried, the steel panels were immersed in 5% NaCl solution for 60 days and left in salt spray chamber for 35 days according to standard ASTM G31 and ASTM B117 respectively. The degree of corrosion for full immersion test samples were evaluated by calculating the corrosion rate from weight loss method and by visual observation for samples exposed in salt fog chamber. The adhesion strength was measured according to ASTM D3359 standard. Sample that was most affected by corrosion, has lower adhesion strength with metal. The degrees of corrosion on the steel panel are related to the pigment used in paint and thus the best PANI composite pigment for corrosion protection was PANI-Silicone dioxide (PANI-SiO2) while the best nano form in terms of corrosion protection was PANI nanofiber. This was due to its highest electrical conductivity and good adhesion strength for PANI-SiO2 and better dispersion stability for PANI nanofibers. 2010-04 Thesis http://eprints.utm.my/id/eprint/12282/ http://eprints.utm.my/id/eprint/12282/4/AhmedAhmedDulaimiMFKKKSA2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering Faculty of Chemical and Natural Resources Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology A. Ahmed Al-Dulaimi, Ahmed Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
description	Conducting polymers have recently been studied as a new class of materials for the corrosion protection of metals. Polyaniline (PANI) is the best candidate to perform this function due to its high environmental stability and simple preparation. Polyaniline was synthesized by polymerizing aniline monomer with various inorganic oxides and with several ratios of phosphoric acid doping. The prepared samples were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction Meter (XRD) and the morphology of these samples was examined using Scanning Electron Microscopy (SEM) and Field Emission Scanning Electron Microscopy (FESEM). Electrical conductivity of the samples was measured using a multimeter. Besides, pigments dispersion stability was observed in ethanol medium at six increasing times (0, 1, 3, 6, 12 and 24 hours). The prepared samples were used as anti-corrosive pigments by blending with commercially available acrylic paint. The blended pigments and acrylic paint were then applied on carbon steel panels by simple dip coating method. The coated steel panels were then dried at room temperature for two days. Once the coatings were fully dried, the steel panels were immersed in 5% NaCl solution for 60 days and left in salt spray chamber for 35 days according to standard ASTM G31 and ASTM B117 respectively. The degree of corrosion for full immersion test samples were evaluated by calculating the corrosion rate from weight loss method and by visual observation for samples exposed in salt fog chamber. The adhesion strength was measured according to ASTM D3359 standard. Sample that was most affected by corrosion, has lower adhesion strength with metal. The degrees of corrosion on the steel panel are related to the pigment used in paint and thus the best PANI composite pigment for corrosion protection was PANI-Silicone dioxide (PANI-SiO2) while the best nano form in terms of corrosion protection was PANI nanofiber. This was due to its highest electrical conductivity and good adhesion strength for PANI-SiO2 and better dispersion stability for PANI nanofibers.
format	Thesis
qualification_level	Master's degree
author	A. Ahmed Al-Dulaimi, Ahmed
author_facet	A. Ahmed Al-Dulaimi, Ahmed
author_sort	A. Ahmed Al-Dulaimi, Ahmed
title	Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
title_short	Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
title_full	Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
title_fullStr	Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
title_full_unstemmed	Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
title_sort	evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical and Natural Resources Engineering
granting_department	Faculty of Chemical and Natural Resources Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/12282/4/AhmedAhmedDulaimiMFKKKSA2010.pdf
_version_	1747814913555824640

Evaluation of polyaniline composites and nanostructures as anti-corrosive pigments for carbon steel

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