A commercial corrosion meter is a calibrated device and for many environments it is necessary to verify its response.

From this point of view, the reasons for planning this experimental work are explained with reference to the reliability of the determination of the corrosion rate. Then to introduce our concepts on corrosion rate monitoring some theoretical remarks are made on the linear polarization technique and the determination of the polarization resistance. The position of our Laboratory with respect to the monitoring of the acid cleaning of steam generators is briefly discussed and the results obtained on the experimental plant using ATEL's Mod. AP 102 corrosion meter are presented.

In this first stage only the 5% HC1 + BORG P16 (commercial corrosion inhibitor) solution at 75°C was considered, the materials examined being SA 106 grade B, SA 213 GRADE T11 and SA 213 GRADE T22. Results indicate that the calibration of the corrosion meter corresponds neither to the actual behaviour of the electrodes of the probe nor to what is taking place on the surface of the tube pieces. Therefore, for a more reliable evaluation of the aggressiveness of the electrolytic solution use should be made of calibration charts. Some measurements were also made of the surface impedance at 10 Hz, which may prove very useful for a monitoring action.

Subject
Acids, Materials, Corrosion rate, Tubes, Calibration, Charts, Instrumentation, Constants, Weight loss, Corrosion inhibitors, Corrosion probes, Electrodes, Cleaning
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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