Corrosion rate measurements for reinforcing steel in concrete utilizing linear polarization resistance or electrochemical impedance spectroscopy have progressed significantly over the past five years. A range of instruments are presently available for making corrosion rate measurements for reinforcing steel in concrete. These instruments have not yet gained widespread industry acceptance due to inconsistencies in the data. This paper discusses errors due to macro-cell corrosion couples in both potential and corrosion rate measurements that may explain, at least, a portion of these inconsistencies. These errors primarily manifest themselves as more negative potentials than actually exist on the reinforcing steel and higher corrosion rates than actually exist in the low or no chloride contaminated areas.

Subject
Steel structures, Electrochemical impedance spectroscopy, Corrosion currents, Corrosion rate, Rebar, Slabs, Negative potentials, Linear polarization resistance, Chlorides, Polarization resistance, Electrodes, Concrete, Electrode potential
Keywords:
corrosion rate, concrete, polarization resistance, impedance spectroscopy, macro-cell
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.