Upsets in cooling plants due to process contamination, pH depressions and loss of biological control can result in the initiation and rapid growth of pitting type corrosion. Traditional pitting inhibitors have been based on heavy metals but, with increasing environmental concerns, alternative chemicals have been evaluated. By using surface analysis techniques it was possible to investigate the behaviour of a novel phosphonate and compare it to a known pitting inhibitor, molybdate. A mechanism is proposed that accounts for laboratory and field results with this phosphonate.

Subject
Pits, Water, Metal surfaces, Phosphonates, Calcium, Surface analysis, Corrosion inhibitors, Pitting, Cooling water, Upset, Cathodic inhibitors, Wastes, Anodic inhibitors
Keywords:
pitting inhibitor, molybdate, surface analysis, amine oxide
© 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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