Abstract
When a brand-new galvanized cooling tower was placed in service using a commercial molybdate program at elevated pH, globules and streaks of a waxy solid material, later found to be a hydrated basic zinc carbonate, unexpectedly appeared on the galvanized surfaces. This caused serious concern until the deposition process was reversed. Meanwhile, similar galvanized towers, which were also being closely watched because of this incident, did not exhibit the phenomenon. This presentation traces more than two years of field history before and after the solids disappeared, leaving behind scars of discolored metal. Additional data substantiate the field observations and support the conclusions drawn.
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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