Studies on AC interference grew up in the last 30 years. For direct stray current corrosion on buried structures there is large agreement on criteria to be used for corrosion mitigation and international standards are available since many years. AC corrosion mechanism is not yet understood and reliable techniques for the determination of the corrosion risk are not yet available. This paper illustrates the results of laboratory tests on the influence of AC interference on carbon steel and galvanized steel corrosion in seawater, soil and concrete simulating solutions. The changing of the Tafel plot is compared with the results of theoretical models reported in literature. In the concrete simulating solutions the AC interference leads to a considerable decrease on the critical chloride threshold for pitting corrosion occurrence. The tests in seawater simulating solution revealed that the AC causes a localized corrosion also when not expected.

Subject
Alkaline solutions, Chloride solutions, Seawater, Density, Lead, Sodium chloride solution, Galvanized steel, Corrosion modeling, AC interference, Carbon steel, Localized corrosion, Chlorides, Tafel slope
Keywords:
AC interference, Tafel parameters, corrosion kinetic, corrosion mechanism
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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