Abstract
Theoretically, it is possible to use a measure of voltage difference (ΔE) between an iron electrode and a second electrode to follow the concentration of iron in chemical cleaning solutions, as predicted by the following equation: where A and B are characteristics of the cleaning solvent. Field evaluations of this theory were performed during three superheater/reheater cleanings. In these cleanings, a set of probes was used to continuously monitor the voltage difference between a platinum electrode and a carbon steel electrode. The voltage difference between these probes reflected the amount of iron in the chemical cleaning solutions. Plots of these data were made to verify the equation.
A second set of electrochemical corrosion probes was placed in each system to monitor corrosion during the cleanings. Measurements of the corrosion rate followed the trends expected during a normal chemical cleaning and demonstrated that this technique can be applied in a field chemical cleaning.
The results of the trials reported in this paper demonstrate that electrochemical monitoring devices can be used for "real-time" monitoring in organic acid chemical cleanings. As the backlog of data is broadened on these systems and their dependability proven, they can become increasingly useful on-line monitoring tools during a chemical cleaning operation.
© 1985 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).
1985
Association for Materials Protection and Performance (AMPP)
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