Diethylhydroxylamine (DEHA) has been shown to be an effective oxygen scavenger for both feedwater and condensate systems within the boiler cycle. It has also been shown to be a strong metal passivator in both laboratory and field tests. Measurements of the polarization characteristics of mild steel in the presence of these compounds reveal enhanced passive film formation. This is independent of the solution pH when evaluated between 8.0 and 9.0. Measurements over a range of concentrations of DEHA show that enhanced film formation is related to the adsorption of the inhibitor. Results are presented which demonstrate these effects and the iron passivation mechanism is discussed.

Subject
Hydrazine, Metal surfaces, Passive films, Condensates, Iron, Oxygen scavengers, Polarization curves, Feedwater, Film formation, Steel, Boilers, Passivation, Oxygen
© 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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