Engineering HDR Seminar Series 14, 2011: Development of Anti-corrosion Coatings Impregnated with Nano-additives

Ms Poovarasi Balan, School of Engineering, Monash University Sunway Campus

Date: 2011-11-11
Time: 10:00 to 11:00
Venue: Meeting Room 1, 5-4-22, School of Engineering


Chromate pre-treatments on metal prior to coating are bundled with environmental, safety and cost issues. Environmental legislations are seeking to curtail its use by replacing them with environmentally friendly pre-treatments. Silane coatings are well-known as outstanding replacements for more than two decades now. However, as compared to chromates, silane pre-treatments can only offer short-term and passive protection for metal surfaces. In the recent years, addition of nanoparticles is seen as a solution for the former issue. Another possible solution could be addition of inhibitors such as rare earth cations in order to provide active protection to the metal surfaces. These cations can leach out of the film, act upon actively corroding region on the metal and ultimately confer self healing properties. The present work seeks to determine whether the addition of both nanoparticles and inhibitors can synergistically improve the corrosion protection of silane films deposited on low carbon steel.  A new type of corrosion inhibitor (i.e. lanthanum triflouromethanosulfonate) is being used to activate silica nanoparticles in this work. Lanthanum doped silica nanoparticles are impregnated in the hybrid sol-gel coatings. Hybrid sol-gel coatings used in this work is a combination mixture of γ-gycidoxypropyltrimethoxysilane (GPTMS) and tetraethyl orthosilicate (TEOS). Electrochemical impedance spectroscopy (EIS) measurements shows that coatings containing silica nanoparticles doped with lanthanum-triflouromethanosulfonate shows highest impedance values as compared to the samples containing either one of them. Mechanism of corrosion inhibition of the low carbon steel by the rare earth compound will also be investigated.

About the Speaker

Ms Poovarasi Balan completed her first degree in Chemical Engineering, University Putra Malaysia in 2004 and Masters’ degree in Materials Science and Engineering, Malaysia University of Science and Technology in 2006. She is currently lecturing in the Chemical Engineering Department in Monash University Sunway campus and pursuing her PhD studies at the same time. Prior to joining Monash in August 2009, she was working as an engineering lecturer at Help University College from 2007-2009. She is an Associate Member of Institute of Chemical Engineers (IChemE) and registered member of Institute Engineers Malaysia (IEM). She research interest includes development of smart and self healing coatings for corrosion resistance.