The commercialization of phosphonates for cooling water applications ushered in a new era for chemical treatment by the service companies. Introduced in the late 1960's, they remain the mainstay of programs utilized in areas ranging from HVAC to heavy industrial applications in steel mills. The longevity of this family of compounds is due to their effectiveness as calcium carbonate threshold agents and apparent activity as ferrous metal corrosion inhibitors.

The universal acceptance of phosphonates in cooling water programs has inadvertently resulted in generalized applications of the materials. In reality each phosphonate compound possesses properties that distinguish them for specific applications. The purpose of this paper is to highlight the strengths of phosphonates incorporated into cooling water formulations. Information will be presented outlining activity for commercially available phosphonates including a new phosphonate, POCA, using bench and process tests.

Subject
Water, Corrosion rate, Additives, Phosphonates, Calcium, Water chemistry, Acidity, Metals, Corrosion inhibitors, Chlorine, Corrosion protection, Deposit corrosion, Cooling water
Keywords:
phosphonate, AMP, HEDP, PBTC, HPA, POCA, corrosion, deposition, cooling water
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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