Polarization scans and long-term, fixed-potential experiments were performed on mildsteel specimens in a soil leachate to quantify the effect of temperature on cathodic-protection requirements. Results indicate that the corrosion rate for the unpolarized condition increases with increasing temperature. In addition, the experiments show that the polarized potential and polarization needed to reduce the corrosion rate to at least 1 mpy (25.4 μm/y) also increase in magnitude. These results agree with preliminary field data from a thermally insulated pipeline.

Subject
Electrochemical cells, Corrosion rate, Cathodic potential, Pipelines, General corrosion rate, Steel, Pitting, Corrosion protection, Polarization, Polarized potential, Electrochemical potential, Soil, Test specimen
Keywords:
cathodic protection, buried pipelines, temperature, polarization, corrosion rate
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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