Results of tests with 2 nonchromate (and 1 low chromate) inhibitors for chemical plant cooling water heat exchangers are reported. These inhibitors were tested by the NACE test exchanger method to determine pitting and fouling rates. Combined with results reported earlier, comparable data is now available on 10 inhibitor systems. It is concluded that available nonchromate inhibitors can achieve acceptable results, even though they are less effective overall than the Cr-Zn systems. Good controls on biology and water chemistry are essential when nonmetallic systems are used. It is recommended that designs for exchangers where nonchromate inhibitors are said to be used include an allowance for increased fouling.

Subject
Water, Materials, Corrosion rate, Phosphonates, Tubes, Effluent, Phosphates, Pretreatment, Corrosion inhibitors, Corrosion data, Cooling towers, Steam, Fouling
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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