Corrosion control of the submerged surfaces of potable water storage tanks are best achieved with coatings as the prime barrier complemented by controlled cathodic protection.

In the well coated tank, the automatic potential "IR drop free" cathodic protection control systems mainly sense the potential of a gross bare area, such as the inlet-outlet pipe, subjecting the tank coating to excessive voltages by the IR drop of the applied current through resistive waters to satisfy the polarization requirements of the dominant bare area.

Coatings are compatible with automatic cathodic protection systems controlled to maintain a negative tank-to-water potential of at least -0.85 volts and no more than -1.00 volts measured against a copper sulphate reference electrode placed adjacent to (on) the submerged coated surface while the protective current is applied.

Subject
Electric current, Pipe surfaces, Thin films, Voltage drops, Water, Piping, Cathodic protection, Cathodic potential, Cathodic current, Negative potentials, Potable water, Protection potential, Electrode potential
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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