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Unformatted text preview: f neat barium titanate, show no distinct shape, high agglomeration and porous structures, which were common phenomenon after high temperature calcinations. Defined shaped and non agglomerated particles were commonly achieved by addition of supports such as templates (both organic and inorganic) which were then diffi cult to remove. However, by doping with sodium (~0.3 mole %), the morphology becomes distinct and the particles are spherical. These preparations described the effect of different calcinations temperature on the size of barium titanate. Agglomeration is un avoidable as the average size increased from 0.26 to 0.31 to 0.32 to 0.40 μm after calcinations duration increases from 3 to 6 hours as observed in SEM. Properties of barium titanate were then characterized using x-ray diffraction (XRD), fourier transform infrared (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX). 153 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia MAT-O23 CORROSION INHIBITION OF ALUMINIUM ALLOY 6061 IN NATURAL MANGROVE ( RHIZOPHORA APICULATA) TANNINS IN HCl, H2SO4 AND NaCl S. Yahya, *Afidah A. Rahim, R. Adnan and A. Mohd Shah School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: firstname.lastname@example.org The efficiency of mangrove (Rhizophora apiculata) tannin as a new potential of corrosion inhibitors for aluminium alloy in HCl, NaCl and H2SO4 have been determined by weight loss, potentiodynamic polarization, impedance measurements and surface analysis . Polarization measurements shows that mangrove tannins act predominantly as cathodic inhibitors in HCl and mainly as anodic inhibitors in H2SO4 with up to 90 and 80 % inhibition efficiency (% IE) respectively. In NaCl the % IE was performed up to 80 % with increasing the inhibitors concentration. The addition of tannin in all medium increased the charge transfer resistance via impedance measurements. Surface analysis on aluminium showed that the roughness...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11