Corrosion damage to process instrumentation, computer systems and electrical switch gear due to corrosive environments is frequently being controlled by the use of vapor corrosion inhibitors (VCI). Additionally, these inhibitors are used to protect products that are being packaged for storage and/or shipment, and for lay-up of major equipment systems. Typically, the evaluation of their effectiveness has been by utilizing weight loss coupons or by direct observation of the protected surfaces. Neither technique provides a timely indication loss of protection due to consumption of the VCI or is amenable to remote monitoring.

A more serviceable technique utilizing thin-film electrical resistance corrosion sensors with relatively low cost instrumentation has been developed. This technology offers the advantages of continuous monitoring of the potentially corrosive environment as well as the capability to forecast the need for additional VCI without risking damage or deterioration of the protected products or equipment.

Results are presented from operational experience within a chemical laboratoiy environment as well as test results obtained within a test chamber where different corrosive gases and VCls were evaluated.

Subject
Test methods, Sensors, Materials, Corrosion rate, Volatile corrosion inhibitors, Instrumentation, Electrical resistivity, Corrosion inhibitors, Equipment, Corrosion protection, Corrosion resistance, Copper, Elements
Keywords:
Atmospheric corrosion, corrosion monitoring, environmental corrosion, vapor corrosion inhibitor, VCI
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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