Uncatalyzed titanium is shown to be usable under some cathodic protection (CP) applications. At high current densities, such as those employed in NACE Standard Test Method TMO294-94, passivation of uncatalyzed titanium occurs as expected. However, the non-linear nature of the current density versus time relationship can lead to significant lifetimes when the uncatalyzed titanium anode is operated at current densities approaching typical CP applications. Predicted lifetimes at current densities typically used in impressed current CP applications are sensitive to the history of the titanium anode (mechanical, chemical or thermal treatment), the test electrolyte, and the mathematical function used to extrapolate the data to CP operational current densities. Comparison of predicted lifetimes, obtained from the mathematical functions derived from laboratory experiments, with data obtained from samples tested in concrete panels under a number of current densities and atmospheric conditions, are encouraging.

Subject
Ribbons, Materials, Titanium mesh, Electrochemical cells, Voltage, Sand, Oxide layers, Meshes, Current densities, Titanium, Concrete, Electrolytes, Anodes
Keywords:
Cathodic protection, titanium anode, concrete, reinforcing steel, modelling, passivation, electrolyte, anode history
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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