A laboratory investigation was conducted to determine the effectiveness of various corrosion protection methods for aboveground storage tanks with secondary containment designs. Ten small-scale test "tanks" simulating the environment and geometry of an inner section of a double bottom storage tank were constructed and exposed for 101 days. The results show that even when measured reference potentials and electrical current suggest corrosion has been arrested, cathodic protection may not fully protect against corrosion. Pitting attack occurred on sand and pea gravel tests with cathodic protection.

Subject
Limestone, Water, Electrochemical cells, Sand, Calomel, Magnesium anodes, Backfill, Steel, Pitting, Oxygen, Corrosion resistance, Impressed current, Corrosion potential
Keywords:
aboveground storage tanks, secondary containment, pitting, resistivity, cathodic protection, sacrificial anodes, vapor phase inhibitor, impressed current, pea gravel, sand
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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