Recent surface analytical investigations of the metal-water interface have provided insight into the composition, thickness and growth of passive layers produced under high alkalinity conditions by organic corrosion inhibitors. These results allow the definition of a chemical mechanism influencing the formation of the passive layer based on the role of dissolved oxygen in cooling water as an anodic corrosion inhibitor. The restricted solubility of oxygen in water can reduce its concentration such that it is in a dangerous concentration range. Under these conditions, reduction of the solubility of the primary ferrous corrosion product with respect to the solubility of siderite is an important factor.

Subject
Water, Ions, Hydroxides, Metal surfaces, Iron, Solubility, Acidity, Corrosion products, Film formation, Corrosion inhibitors, Surface layers, Oxygen, Chlorides
© 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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