A crown flushing technique for reducing the low pH caused on concrete sewer pipes by Thiobacillus bacteria has been evaluated using a corrosion monitoring system consisting of bare steel electrodes, steel electrodes embedded in concrete and pH electrodes. Data for these sensors have been taken simultaneously every 10 min for several months in a corrosion chamber fed with sewer gas. In addition, laboratory experiments have been performed with this sensor system in the absence of intentionally added bacteria. Impedance data serve as a very sensitive indicator of the initiation of corrosion on steel in concrete.

Subject
Steel surfaces, Sensors, Piping, Corrosion rate, Flushing, Impedance, Rods, Acidity, Steel, Corrosion data, Sewage systems, Electrodes, Concrete
Keywords:
Corrosion monitoring, corrosion sensors, microorganisms, concrete, steel, polarization resistance, electrochemical impedance
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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