Manganese from natural water sources causes deposition and associated corrosion problems in municipal and industrial water systems, particularly where chlorination is employed. Polymers are used to limit the precipitation of iron/manganese and manganese salts. Evidence for solubilization of manganese salts by polymeric and molecular agents has also been obtained. Factors such as dosage and composition have a significant impact on the performance of polymers. A polymer’s ability to perform effectively is also significantly affected by operating conditions such as temperature, pH, iron:manganese cation ratio and oxidizing conditions (e.g. air vs. chlorination). In zinc-based corrosion inhibiting programs, polymers have exhibited the ability to control precipitation of both zinc and manganese salts. Scanning electron microscopy and particle size distribution studies clearly indicate polymer performance is related to the ability to limit agglomeration of microparticulates. Application of these concepts suggests viable approaches for controlling manganese deposition in cooling water systems.

Subject
Water, Precipitation (solids), Salts, Iron, Dosages, Dispersion, Manganese, Acidity, Particulates, Polymers, Corrosion inhibitors, Chlorine, Oxidation
© 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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