Organically-modified silicate (Ormosil) films have been found to provide good corrosion resistance for 2024-T3, 6061-T3, and 7075-T6 aluminum alloy substrates. Significant enhancement in corrosion resistance properties of these films were observed upon addition of sub-micron to micron-sized TiO2 particles to the Ormosil coating as determined using accelerated salt spray and electrochemical analysis. Rcorr values derived from potentiodynamic polarization curves were found in the range (147-258) kΩcm2 for doped and non-doped Ormosil thin films. Epit values for doped Ormosil coatings showed the dramatic change into the positive potential region from (-214 to +100) mV for the non-doped Ormosil to (+403 to +1899) mV for particle-doped Ormosil thin films.

Subject
Pits, Test methods, Thin films, Substrates, Spray coating, Solgels, Titanium oxide, Salt spray corrosion testing, Pitting, Corrosion protection, Corrosion resistance, Aluminum alloys, Potentiodynamic polarization
Keywords:
Ormosil, corrosion-resistant, salt spray, potentiodynamic polarization curves, particles
© 2002 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2002
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.