Cathodic protection is known as effective Corrosion protection measure for steel structures built in the place near the sea where conductivity of the soil is low. However, it is not effective for an oil tank bottom plate which embeded on highly conduetive asphalt mortar or oil sand as anticorrosive bed. In order to clarify the reasons, steel probes to measure corrosion rate and inflow current, and plutinum probes to measure Oxygen diffusion Rate (O.D.R) were set in the anticorrosive bed of thirty tanks. From the result of measurements, the planning method for cathodic protection which has been used till now — planning according to the potential on the tank rim — was found bo be not useful. A new planning method —using conductive paper—was developed, and a method by Finite Element Method was also developed.

Subject
Electric current, Protection practices, Modeling, Cathodic protection, Corrosion currents, Corrosion rate, Reference electrodes, Current densities, Current distribution, Corrosion protection, Tank bottoms, Soil, Oil
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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