A new technique for monitoring atmospheric corrosion of iron has been developed which utilises the volume expansion associated with corrosion of multiple specimens to enable fast and sensitive determinations of real-time corrosion rates. Results are presented to illustrate several applications of this technique. These include the determination of activation energies for rusting and the influence of restraining stress, the effects of humidity and rainfall and the study of high atmospheric corrosion rate episodes due to periodic inland transport of sea-salt.

These examples illustrate several advantages of the method, such as a remote measurement capability and a high degree of reproducibility even when used in environments with severe electrical noise. In a large field survey, measurements obtained using the new technique have been found to correspond closely to traditional weight loss measurements after long duration exposures.

Subject
Atmospheric corrosion, Materials, Corrosion rate, Rainfall, Displacement rate, Activation energy, Metal loss, Transducers, Insulators, Pollutants, Metals, Steel, Surveys
© 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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