The potentials of manganese dioxide electrodes, lead, graphite and some other metals have been measured in the laboratory in synthetic pore water solutions and when the electrodes were embedded in concrete. Measurements have been carried out with the aim of determining the potentials of manganese dioxide, lead and graphite electrodes permanently installed in a large bridge. The measurements were carried out a year after the installation. The latter measurements indicate a significant divergence of the potentials of the electrodes of the same type. The changes with time appeared to be rather small. It is difficult to establish whether a 10 mV change in the potential between the reinforcement steel and a single reference electrode originates from a change of the corrosion potential or drift in the reference electrodes. The much larger response of the potential that hikes place if the corrosion process changes significantly is detectable with all three types of electrodes.

Subject
Water, Materials, Reference electrodes, Manganese, Graphite, Lead, Slabs, Steel, Oxygen, Electrodes, Corrosion potential, Concrete, Electrode potential
Keywords:
Reference electrodes, concrete, corrosion measurements, steel
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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